l1279-c1 responses to questions as from 9 19-29 2014 · 2018. 10. 11. · 5 responses to questions...

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MPA Project No. L1279-C1Terminal C Entrance Doors Replacement

One Harborside DriveEast Boston, MA

RESPONSES TO QUESTIONSand/or RFI’s

LASTUPDATED

September 26, 2014

The attention of Contractors submitting General Bids and or Filed Sub-Bids for the above referenced project iscalled to the following Responses to Questions and/or RFI’s.

Responses to Questions and/or RFI’s as of September 19, 2014

1. R&R Builders’ electronic mail to CPBidQuestions from Robert Russo’s email datedThursday, September 11, 2014:

Item 1.

Summary of Question: RFI#1 Reference: Division IIB Article 44:

Question #1: The specifications ask for 3 radios for this project. I know the radios arecostly. There is a tel # for a contact presumably for pricing. I have tried to reach Mr.McCone and all I get is a request to leave a message. I do not receive a call back. Thishas happened before and I was unable to price the radios. Can you provide anothercontact source?Question # 2: It seems that all work is well within the confines of the terminal and notarmac work will be needed except perhaps on the apron/access road areas. WouldMassport be willing to delete the radio provision from the contract?

Design Team Response to Question #1 and #2: radios are required on all Massportprojects and are used as a tool of communication, productivity and safety. They arespecifically required for this project given the nature of the hours of the day that thework on this project will take place.

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2. R&R Builders’ electronic mail to CPBidQuestions from Robert Russo’s email datedThursday, September 11, 2014:

Item 1.

Summary of Question: RFI#2 Reference: Division IIB (Barricades) Section 09900:

Question #1: The drawings indicate barriers to be used on the project. The barriers areto be painted. Review of section 09900 does not mention painting of the barriers underthe section work scope. Is the painting of the barriers to be carried under section 09900or is the General Contractor to include the cost of painting the barriers?

Design Team Response: drawing A722 indicates touch up by the General Contractor. Theintent is that the general contractor shall be responsible for these Barricades includingpainting and touchup.

3. R&R Builders’ electronic mail to CPBidQuestions from Robert Russo’s email datedFriday, September 12, 2014:

Item 1.

Summary of Question: RFI#3 References: Section 15000 Art. 3.5D & Section 15000Art. 109F:

Question #1: The Section is headlines as HVAC work however when reading the entiresection it seems that the intent of this section is to include Section 15300, 15400, and16000. Can you clarify if the Section 15000 is all inclusive of the mechanical andelectrical trades or is the intent only the HVAC trade?

Design Team Response to Question #1: Section 15050 Basic Mechanical Requirements isapplicable to all mechanical trades, Division 15 Mechanical. Any electrical requirementsin section 15050 are superseded by the electrical requirements contained in Division 16Electrical.

Question #2: Section 15000 Art. 3.5 D indicates the extent of the FSB trade demolitionwork is to lower the demo items to the floor with removal to be included under theDemolition Section. However, review of Article 109F under section 15500 directs theHVAC FSB Contractor to completely remove the demolished items. Can you clarify thework scope?

Design Team Response to Question #2: Section 15050 Article, 3.5D is not correct. The HVACFSB contractor is responsible for removal of demolished items. Section 15500 Article 1.09Fis correct. Note reference to the last sentence of Article 1.09F “Dumpsters are notpermitted”. The contractor is directed to Division llB Special Provisions, Article 22 Storageof Hazardous Materials and Article 23 Debris and Surplus Materials for furtherinformation.

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4. R&R Builders’ electronic mail to CPBidQuestions from Robert Russo’s email datedFriday, September 12, 2014:

Item 1.

Summary of Question: RFI#4 References: Section 02075 Art 1.03, Sect. 16015 Art. 3.01l:

Question #1: Section 02075 seems to indicate that ballasts/lamps are to be handledunder this section. However Sect. 16015 also calls for the work to be performed underthis section. Can you clarify what section the ballast & lamps are to be removed?

Design Team Response: Disposal of ballast and lamps are to be handled undersection 02075 Miscellaneous Oil and Hazardous Material Removal.

5. Northeastern Mechanical, Inc. – Patriot Plumbing and Heating, Inc. electronic mail toCPBidQuestions from Tom Riley email dated Monday, September 15, 2014:

Item 1.

Summary of Question: Request for Information #1.Dear sir is the plumbing a filed sub bid on this project.

Design Team Response: Section 15400 Plumbing is a filed sub-bid as indicated in thenotice to contractors and specification.

6. Page Building Construction Co. dated September 17, 2014

Item 1.

Summary of Questions: RFI #1

Question #1: is the curtain wall specification part of the glass and glazing Files-Subbid?

Design Team Response to Question #1: No, Section 08900 Curtain Wall, 2.4 GlazingSystems calls out the glazing “as specified in section08800 Glazing.

Question #2: is the wall covering specification part of the painting Filed-Sub bid?

Design Team Response to Question #2: No, painting is called for in Section 09270Wall Coverings, 1.3 Related Work, A.2; Section 09900 Painting for coordinationpurposes only.

Question #3: The unit price breakdown on the bid form looks to be breaking out ourbase bid amount. However, there isn’t an item # listed for the GC price minus items#1-14. Please provide us with a revised bid form that has an item in which we canplug in our GC price.

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Design Team Response to Question #3: Please see, included with this RFI document,pages P-8 to P-12 of the Bid Form outlining graphically the answer to your question.

7. Page Building Construction Co. dated September 19, 2014

Item 1.

Summary of Questions: RFI #2

Question #1: Is there a specific manufacturer and product for the EPDM roofing that weare required to use? There isn’t a manufacturer listed in the spec

Design Team Response to Question #1: the existing roof is an old ballasted built-up roofthat is going to be completely replaced under the Terminal C-E Connectors project. If theexisting roof has not been replaced prior to our project scope of work being completed thenthe repairs to the roof around any new penetrations should be completed using industrystandards of best practice with the understanding that the roof will be replaced in thenear future.

8. Kapiloff’s Glass Inc. electronic mail to CPBidQuestions from Chris Kapiloff email datedFriday, September 19, 2014:

Item 1.

Summary of Question: RFI for Massport Authority Terminal C Entrance DoorsReplacemennt.

Question #1: Section 08000 2.2 C call for “Black out security film by 3M”. 3M does nothave a single film that does both. Does the owner want two films (one for security andanother for black out)?

Design Team Response to Question #1: Section 08000 Glass and Glazing, 2.2 GlazingMaterials, C. Glazing film should read as follows: “Provide blast resistant film equal to 3MScotchshield Ultra Safety series.

Question #2: Section 08000 2.1 D Call for mirrors to have steel channel at the base. A403shows the mirrors in elevation and there is channel on all four sides.

Design Team Response to Question #2: Provide mirrors as called for in the ToiletAccessory Schedule, Keynotes 04 and 12, brushed stainless steel frame all around.

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Responses to Questions and/or RFI’s as of September 26, 2014

9. Lynnwell associates, Inc. electronic mail to CPBidQuestions from Tony veiga email datedMonday, September 22, 2014:Item 1.Summary of Question:Question #1: On drawing E-101A between column lines N40 & N39 shows key notes 3 and4 together. Note 3 designates LED lighting fixture but none seems to be shown in thedirection of the arrow. Please clarify.Design Team Response to Question #1 Note 3 & 4 (arrow head) is for canopy LED lightingfixture, E101A.Question # 2: Fixture type “CWE1” is listed on the lighting fixture schedule but theredoesn’t seem to be any shown on the lighting plans. Please clarify if this fixture isrequired for this project and if yes please clarify location (s).Design Team Response to Question #2: Fixture type “CWE1” is shown on restroom corridorwall, drawing E-101A.Question # 3: Manufacturer for existing DP9E-H1 is required in order to purchasecorrect 90A-3p circuit breaker. Please provide manufacturer.Design Team Response to Question #3: Manufacturer for existing DP9E-H1 isWestinghouse. Please refer to general note #10 drawing E-001.

10. Page Building Construction Co. electronic mail to CPBidQuestions from ChrisZacchilli dated Tuesday September 23, 2014.Item 1.Summary of Questions: RFI #3 dated September 25, 2014.Question #1: Specification section 03300 Cast in Place Concrete is missing from thespecifications. Please provide.Design Team Response to Question #1: Please see attached section 03300 Cast in PlaceConcrete.

11. Page Building Construction Co. electronic mail to CPBidQuestions from ChrisZacchilli dated Tuesday September 23, 2014Item 1.Summary of Questions: RFI #4 dated September 25, 2014.Question #1: In reference to our previous RFI #1 in regards to Filed-Sub bids, pleasesee below for re-phrased questions.

a. Is the painting files-sub bidder to include the wall covering in his price asis typically the case?

b. Is the glazing filed-sub bidder to include the curtain wall in his price as istypically the case?

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Design Team Response to Question #1:a. Section 09720 Wall covering is standalone section and will not be includedin the painting filed-sub bid.b. No, the glazing sub bidder will not include the curtain wall in their price.

12. R&R Builders’ electronic mail to CPBidQuestions from Robert Russo’s email datedTuesday, September 23, 2014:

Item 1.

Summary of Question: RFI#5 Reference: Drawing A-111 Elevation 3 & 4 on A-300:

Question #1: Plan notes indicate shaded area not in work scope. Drawing A-111 notes a walltype D6D along line 200. Wall type D6D is scheduled to be new but the area along 200 isshaded in. Can you clarify the wall intent along line 200.Design Team Response to Question #1: the D6D enclosure wall applies along 200 line. Thearea not in scope is behind the corridor enclosure wall. If you refer to drawing D-111 youwill note the wall at column line 200 does not exist.

13. Page Building Construction Co. electronic mail to CPBidQuestions from ChrisZacchilli dated Wednesday September 24, 2014Item 1.Summary of Questions: RFI #5 dated September 25, 2014.The following is a question regarding fireproofing from one of our subs.

Question #1: Drawing G-004 below shows a large area of the existing ceiling beingremoved. We will assume from past experience working at Logan that the plaster ceilingmay have been used as the fire rating for the structural steel beams above it. Once theceiling is removed and the beams are exposed, they will need to be sprayed to provide thefire rating required by code.Once the ceiling is removed per drawing G-004, will the exposed beams requirefireproofing? If so, please provide as-built drawings showing the existing structural steelabove the ceiling. The spec does not address this. It only says; patch existing damaged bytrades and spray new. We do not see any new.

Design Team Response to Question #1:Terminal C within the scope area (from N24 to N38 lines) is a reinforced concrete building.Fireproofing is not required for this structure. Terminal C within the scope area (fromN38 to N40 lines) is a structural steel framed building that has spray on fireproofing onthe beams. The specification (section 07810) gives direction as to “patching of spray fire-resistive materials disturbed by construction operations”. That is what will be required.Any penetrations resulting from this construction process will be sealed per section 07840Fire Resistive joint Systems.

14. Lynnwell associates, Inc. electronic mail to CPBidQuestions from Craig Canha emaildated Thursday, September 25, 2014:Item 1.Summary of Question:

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Question #1: key notes 13, 14 & 15 who provides these devices and equipment? Does itcome with the furniture? These items are not specified in the electrical specification oron the furniture specifications, please clarify.Question #2: Does the General Contractor provide the items, above, and the electricalcontract install them, or does it come installed with the furniture, Please clarify.Design Team Response to Question #1 and 2: The Arconas furniture will be delivered withthe in Power Flex modules installed by the furniture supplier. These units are then pluggedinto standard electrical outlets. The electrical contractor is responsible for providingelectrical outlets and wiring.Question #3: The Manufacture for the type BBE1 is requesting Arch / Engineer info aswell as a drawing showing the fixtures, Please provide this information ASAPDesign Team Response to Question #3: The information as called out on the Luminaireschedule drawing E-901 describes the fixture. Enhancing the information the fixture is ana.light X4, 2’-0” wall sconce with a surface slot luminaire and integrated MR16 down-light.It’s the X4 fixture with an MR 16 LED down light addition.

15. DePaoli Mosaic Company. electronic mail to CPBidQuestions from Corinne Proctor emaildated Wednesday, September 24, 2014:Item 1.Summary of Question:Question #1: To Whom It May Concern,The terrazzo flooring specification lists only 80% of the aggregates. Can you tell me whatthe other 20% aggregates are in the terrazzo sample formula for the new restroom floorand base?Design Team Response to Question #1: China white 0’s and 1’s constitutes 20% of each typewith a total of 40% (20% 0’s and 20%1’s) with the remaining mix percentages it adds up to100%.

16. Page Building Construction Co. electronic mail to CPBidQuestions from ChrisZacchilli dated Friday September 26, 2014

Item 1.Summary of Questions: RFI #6 dated September 26, 2014.Question #1: Specification section 09720-1 – Wall Coverings states that this section isaffected by alternates and to refer to section 01030 – Alternates. There isn’t a section01030 – Alternates in the specification. Please provide us with section 01030 –Alternates.Design Team Response to Question #1: Alternates are referenced on page P-1 of the BidProposal Form under paragraph “The work includes: Alternate #1:” Section 01030Alternates does not apply. Reference should direct bidders to the Bid Proposal form.

~End of Response~

Total Base Bid $ IndicatedHere. Includes Both Item 1 &Item 2 Below.

Item 1 = Bid $ of GeneralContractor Work, Not IncludingItem 2 Filed Sub-Bid $ Below,Indicated Here

Item 2 = Total of Filed Sub-Bid $,Not Including Bid $ Of Item 1Above, Indicated Here

Massachusetts Port Authority 03300 - 1 Cast-In-Place ConcreteTerminal C Entrance Doors ReplacementMPA Contract No. L-1279-C1 August 20, 2014

SECTION 03300

CAST-IN-PLACE CONCRETE

PART 1 - GENERAL

1.01 GENERAL PROVISIONS

A. Attention is directed to the GENERAL REQUIREMENTS AND COVENANTS -DIVISION I, the SPECIAL PROVISIONS - DIVISIONS IIA and IIB, and theSAMPLE CONTRACT FORMS - DIVISION IV, which are hereby made a part ofthis Specification Section.

B. Examine all Drawings and all Sections of the Specifications for requirements andprovisions affecting the work of this Section.

1.02 DESCRIPTION OF WORK

A. Work Included: Provide labor, materials and equipment necessary to complete thework of this Section, including but not limited to the following:

1. Cast-in-place concrete, including formwork, reinforcement, concrete materials,mixture design, placement procedures, and finishes for the followingapplications:

a. Cutting and patching for mechanical and electrical penetrations throughcast-in-place concrete.

b. Footings for exterior bollards.

1.03 DEFINITIONS

A. Cementitious Materials: Portland cement alone or in combination with one or more ofthe following: blended hydraulic cement, fly ash and other pozzolans, groundgranulated blast-furnace slag, and silica fume; subject to compliance withrequirements.

B. Contractor: All trades involved in the execution of this section of the specifications.

1.04 SUBMITTALS

A. Product Data: For each type of product indicated.

B. Design Mixtures: For each concrete mixture. Submit alternate design mixtures whencharacteristics of materials, Project conditions, weather, test results, or othercircumstances warrant adjustments.


1. Indicate amounts of mixing water to be withheld for later addition at Projectsite.

2. Indicate amount of fly ash in the mix, if used.

C. Steel Reinforcement Shop Drawings: Placing drawings that detail fabrication,bending, and placement. Include bar sizes, lengths, material, grade, bar schedules,stirrup spacing, bent bar diagrams, bar arrangement, splices and laps, tie spacing, hoopspacing, and supports for concrete reinforcement.

D. Material Test Reports: For the following, from a qualified testing agency, indicatingcompliance with requirements:

1. Aggregates. Indicate that proposed aggregates will not cause any deleteriouseffects to the proposed concrete mix, e.g. ASR.

E. Material Certificates: For each of the following, signed by manufacturers:

1. Cementitious materials.

2. Admixtures. Provide certification that chloride content complies withSpecification requirements. Certify that admixtures used in the same concretemix are compatible with each other and the aggregates.

3. Form materials and form-release agents.

4. Steel reinforcement and accessories.

5. Curing compounds.

6. Bonding agents.

7. Adhesives.

8. Repair materials.

F. Field quality-control test and inspection reports.

1.05 QUALITY ASSURANCE

A. Work on this project shall conform to the requirements of Massachusetts StateBuilding Code (MSBC), Eigth Edition, except as modified by the requirements ofthese Contract Documents.

B. Manufacturer Qualifications: A firm experienced in manufacturing ready-mixedconcrete products and that complies with ASTM C 94/C 94M requirements forproduction facilities and equipment.


1.06 DELIVERY, STORAGE, AND HANDLING

A. Supply labor, materials, and equipment to the Project at such intervals to insureuninterrupted programs of work.

B. Deliver, store and handle materials so as to eliminate contamination, segregation,damage and deformation. Store materials off the ground on wood dunnage ofsufficient height to prevent surface water from coming into contact with materials.Materials shall be stored to provide drainage and protected from the elements withwaterproofing covering, ventilated to avoid condensation.

C. Materials that would be damaged by contact with water or sunlight shall be stored in aclosed, protective environment.

D. Do not deliver concrete to the Project until ready for concrete placement. GeneralContractor shall note the mix time limits referred to by this Section and arrange fordeliveries accordingly.

E. Steel Reinforcement: Deliver, store, and handle steel reinforcement to preventbending and damage. Avoid damaging coatings on steel reinforcement.

PART 2 - PRODUCTS

2.01 CONCRETE MATERIALS

A. Cement: shall be American-made Portland Cement, free from water soluble salts oralkalis which will cause efflorescence on exposed surfaces. Portland Cement shall beType II, ASTM C150. Use only one brand of cement for each type of cementthroughout project. Contractor shall be responsible for whatever steps are necessary toinsure that no visual variations in color will result in exposed concrete and shall placeon order and secure in advance a sufficient quantity of this (these) cement(s) tocomplete concrete work specified herein. If, during the progress of the work, thematerials from the sources originally accepted change in characteristics, the Contractorshall, at the Contractor’ expense, make new acceptance tests of aggregates andestablish new design mixes. Such testing and design shall be accomplished with theassistance of a certified independent testing laboratory, retained by the Contractor,acceptable to the Owner.

1. Fly Ash: ASTM C 618, Class F with the optional requirements for multiplefactor, drying shrinkage, and uniformity from Table 2A of ASTM C 618.Requirement for maximum alkalies from Table 1A of ASTM C 618 shallapply. If pozzolan is used, it shall never be less than 15 percent nor more than25 percent by weight of the total cementitious material

2. Ground Granulated Blast-Furnace Slag: ASTM C 989, Grade 100 or 120.


B. Normalweight Fine Aggregate: shall be washed, inert, natural sand conforming toASTM C33 and following additional requirements:

Sieve Retained Percent#4 0 - 5#16 25 - 40#50 70 - 87#100 93 - 97

Fineness Modulus 2.80 (Plus/Minus 0.20)Organic Plate 2 maximumSilt 2.0 percent maximumMortar Strength 100 percent minimum compression ratioSoundness 5 percent maximum loss, magnesium sulfate, five cycles

C. Normalweight Coarse Aggregate: shall be well graded crushed stone or washedgravel conforming to ASTM C33 and the following additional requirements:

Designated Size(inches) 3/4 1/2 3/8F.M.(+/-0.20) 6.70 6.10 4.50Organic Plate 1 maximumSilt 1.0 percent maximumSoundness 5 percent maximum loss, magnesium sulfate, five cycles

D. Water: shall be from approved source, potable, clean and free from oils, acids, alkali,organic matter and other deleterious material.

E. Admixtures:

1. Water-reducing agent: Admixtures shall be free of chlorides and alkalis(except for those attributable to water). When it is required to use more thanone admixture in a concrete mix, the admixtures shall be from the samemanufacturer. Admixtures shall be compatible with the concrete mix includingother admixtures.

a. "WRDA" - W.R. Grace & Co.

b. "PDA25" - Protex Industries, Inc.

c. "Pozzolith 344H" - Master Builder's Co.

d. Note: Water-reducing agent shall be by same manufacturer as air-entraining agent.

2. Air-entraining agent: Air entraining agent shall be in accordance with ASTMC260. Proportioning and mixing shall be in accordance with manufacturer’srecommendations.


a. "DAREX AEA" - W.R. Grace & Co.

b. "PROTEX AEA" - Protex Industries

c. "MB-VR" or "MB-AE" - Master Builder's Co.

3. Admixtures retarding setting of cement in concrete shall not be used withoutwritten approval of Engineer.

4. Admixtures causing accelerated setting of cement in concrete shall not be usedwithout written approval of Engineer.

2.02 CONCRETE MIXTURES

A. Development and testing of mix designs shall be by an independent testing laboratoryacceptable to the Awarding Authority engaged by and at the expense of theContractor.

B. Sufficient materials for concrete mix design shall be furnished by Contractor not lessthan five weeks before use. Duplicate small samples plainly and neatly labeled withsource, where proposed to be used, date, and name of collector shall be provided andpresented to Testing Agency for permanent reference.

C. It is the sole responsibility of the Contractor to provide concrete with the strength,durability, place-ability, workability, consistency and finishing characteristics requiredby the Contract Documents. Review and acceptance of mix design submissions by theEngineer shall not relieve the Contractor of their sole responsibility.

D. Concrete mixes shall be designed using the methods outlined in the MSBC, ACI 318,and ACI-301. Material and proportioning limits as specified or referenced in theMSBC shall be used.

E. Select properties of ingredients to meet the design strength and materials limitsspecified in:

1. Design mixes to provide normal weight concrete with the following properties:

a. f’c = 4,000 psi, Air Content = 5%-7%, Max. Slump = 4”, W/C = .40.

2. Proportion ingredients to produce a homogenous mixture that will readily workinto corners and angles of forms and around reinforcement without permittingmaterials to segregate or allowing excessive free water to collect on thesurface.

F. Cementitious Materials:

1. 25% by weight of the cementitious materials in concrete mixes may contain flyash or ground granulated blast furnace slag.


G. Concrete shall conform to ASTM C94. One copy of the Certificate of Deliveryrequired by ASTM C94 shall be delivered to the Engineer immediately upon arrival ofeach load of concrete at the site. The Contractor shall be responsible for the design ofthe concrete mixtures.

H. Standard compression tests in conformity with the provisions of ACI 318 of allproposed mixes shall be made by the testing laboratory or other satisfactory evidenceshall be presented that the design mixes will attain the minimum strengths listed on thedesign drawings or called for herein, within the limitations of the ACI Code. Noconcrete shall be delivered to the job site until the Engineer has approved the designmixes.

I. No calcium chloride or admixtures containing calcium chloride shall be added to theconcrete. No admixture other than those specified shall be used in concrete withoutspecific written permission in each case.

J. No additional water, except for the amount indicated by the design mix shall be addedto the concrete without prior permission.

K. Mix design adjustments may be requested by Contractor when characteristics ofmaterials, job conditions, weather, test results, or other circumstances would warrantsuch an adjustment. The Contractor shall review each concrete element prior toordering concrete and determine whether the approved mix designs shall produceconcrete with the placeability, workability, consistency and finishing characteristics.If the Contractor believes that the consistency of the concrete shall producehoneycombing, voids, cold joints or any other deleterious or unsightly conditions, thenthe Contractor shall make an amended mix design submission requesting anadjustment in the mix proportions and/admixtures. The requested adjustments shallnot reduce the strength or durability of the concrete below that which is slated orinferred by this Section. Obtain acceptance before using an amended mix in theProject. Any costs associated with adjustments requested by the Contractor, includingthe costs of additional admixtures, shall be borne by the Contractor.

L. It is the sole responsibility of the General Contractor to provide concrete with thestrength, durability, placeability, workability, consistency and finishing characteristicsrequired by the Contract Documents. Review and acceptance of mix designsubmissions shall not relieve the General Contractor of their sole responsibility.

2.03 REINFORCEMENT AND ACCESSORIES

A. Reinforcing Steel Bars: shall be newly rolled billet steel conforming to ASTM A615Grade 60. Bars shall be bent cold. Reinforcing steel to welded shall be ASTM A706,Grade 60.

B. Welded Wire Fabric: shall conform to ASTM A185.

C. Reinforcement Accessories:


1. Provide support bars, spreader bars, bolsters, chairs, side form spacers, tie wireand other accessories necessary to secure the reinforcing and welded wiremesh accurately in position in accordance with CRSI “Placing ReinforcingBars”.

2. Tie Wire shall be 16-gauge minimum, black, soft-annealed wire.

PART 3 - EXECUTION

3.01 INSPECTION

A. Examine all work prepared by others to receive work of this Section and report anydefects affecting installation to the Contractor for correction. Commencement of workwill be construed as complete acceptance of preparatory work by others.

1. Ensure that bearing strata is suitable for casting concrete to ensure evenbonding of new concrete to existing concrete.

2. Verify requirements for concrete cover over reinforcement.

3. Verify that anchors, seats, plates, reinforcement and other items to be cast intoconcrete are accurately placed, positioned securely, and will not cause hardshipin placing concrete.

3.02 HANDLING, STORAGE, AND PROTECTION OF MATERIALS

A. Handle and store materials separately in such manner as to prevent intrusion of foreignmatter, segregation, or deterioration. Do not use foreign materials or those containingice. Remove improper and rejected materials immediately from point of use. Covermaterials, including steel reinforcement and accessories, during construction period.Stockpile concrete constituents properly to assure uniformity throughout project.

3.03 PREPARATION

A. Before placing concrete, forms and the space to be occupied by the concrete shall bethoroughly cleaned, and reinforcing steel and embedded metal shall be free from dirt,oil, mill scale, loose rust, paint or other material which would tend to reduce the bond.

B. When placing against existing concrete, the structural concrete surface shall becleaned and roughen for proper bonding with new concrete.

C. Grout:

1. Grout shall be placed over concrete that has attained its full design strengthunless otherwise approved.

2. Concrete surfaces to receive grout shall be clean and sound; free of ice, frost,dirt, grease, oil, curing compounds, laitance and paints, and free of all loose


material or foreign matter which may affect the bond or performance of thegrout.

3. Roughen concrete surfaces to ¼” amplitude by chipping, sand blasting, orother mechanical means to ensure bond of the grout to the concrete. Removeloose or broken concrete. Irregular voids or projecting coarse aggregate neednot be removed if they are sound, free of laitance and firmly embedded into theparent concrete.

a. Air compressors used to clean surfaces in contact with grout shall bethe oilless type or equipped with an oil trap in the air line to prevent oilfrom being blown onto the surface.

4. Remove all loose rust, oil or other deleterious substances from metalembedment or bottom of base plates prior to the installation of the grout.

5. Concrete surfaces shall be washed clean and then kept moist for at least 24hours prior to the placement of cementations or cement grout. Saturation maybe achieved by covering the concrete with saturated burlap bags, use of asoaker hose, flooding the surface or other acceptable method. Uponcompletion of the 24-hour period, visible water shall be removed from thesurface prior to grouting. The use of an adhesive bonding agent in lieu ofsurface saturation shall only be used when approved for each specific locationof grout installation.

6. Construct grout forms or other leak proof containment as required. Formsshall be lined or coated with release agents recommenced by the groutmanufacturer. Forms shall be of adequate strength, securely anchored in place,and shored to resist the forces imposed by the grout and it placement.

3.04 PLACING OF REINFORCEMENT

A. Reinforcement shall be placed in accordance with requirements of CRSI 93,"Recommended Practice for Placing Reinforcing Bars" and CRSI 93, "RecommendedPractice for Placing Bar Supports" and with further requirements below.

B. Reinforcement shall be accurately placed in accordance with Contract Documents andshall be firmly secured in position by wire ties, chairs, spacers, and hangers, each oftype approved by Engineer. Accurately position, support and secure reinforcementagainst displacement by construction and concrete placement operations. Locate andsupport reinforcement by support bars, spreader bars, chairs, bolsters, side formspacers, tie wire and other accessories necessary to secure the reinforcementaccurately in position.

C. Place all reinforcement to obtain minimum coverage in accordance with ACI 318“Building Code Requirements for Reinforced Concrete and Commentary – Section


7.7” and the General Notes in the Structural Contract Documents. Set wire ties soends are directed into concrete, not toward exposed concrete surfaces.

D. Bending, welding or cutting reinforcement in field in any manner other than as shownon Drawings, is prohibited, unless specific approval for each case is given byEngineer.

E. Reinforcement shall be continuous through construction joints unless otherwiseindicated on Drawings.

F. Reinforcement shall be spliced only in accordance with requirements of ContractDocuments or as otherwise specifically approved by Engineer. Splices ofreinforcement at points of maximum stress shall generally be avoided.

G. At time concrete is placed, reinforcement shall be free of excessive rust, scale, or othercoatings that will destroy or reduce bond requirements. Reinforcement expected to beexposed to weather for a considerable length of time shall be painted with a heavy coatof cement grout. Protect stored materials so as not to end or distort bars in any way.Bars that become damaged will be rejected.

H. Before concrete is cast, check all reinforcement after it is placed to insure thatreinforcement conforms to Contract Documents and approved Shop Drawings. Inaddition, the Engineer shall be notified at least 36 hours prior to concrete placementand given opportunity to inspect completed reinforcement and formwork beforeconcrete placement. Prior approval of Shop Drawings shall in no way limit Engineer'sright to demand modifications or additions to reinforcement or accessories.

I. Where continuous reinforcing bars are called for, indicated or required, they shall berun continuously around corners, standard hooks art discontinuous ends and splicedonly where absolutely necessary. Splices in adjacent bars shall be staggered. Ifreinforcing must be spliced, the splice shall occur at mid span for top and middle barsand over the supports for bottom bars. Lap and development lengths for concretereinforcing shall be in accordance with the schedules or details included in theStructural Contract Drawings.

J. Drill holes for dowels into existing concrete. Mix, transport and place epoxy grout inaccordance with the manufacturer’s instructions and install dowels.

3.05 JOINTS

A. Joints not indicated or specified shall be placed to least impair strength of structureand shall be subject to approval of Engineer.

3.06 MIXING, CONSISTENCY, AND DELIVERY OF CONCRETE

A. Ready-mixed concrete shall be batched, mixed and transported in accordance withASTM C94, except as otherwise specified. Truck mixers, agitators, and non-agitating


units shall comply with National Ready-Mix Concrete Association (NRMCA) andTruck Mixer Manufacturers’ Bureau (TMMB). Ready-mix plant equipment andfacilities shall be certified in accordance with NMRCA QC 3. Site-mixed concreteshall be mixed in accordance with ACI 301. On-site plant shall conform to theMRMCA CPMB 100.

B. No water from the truck system or elsewhere shall be added after the initialintroduction of mixing water for the batch. When allowed, field added water to bringthe slump within the specified range shall not change the total water in the concrete toa point that the approved water-cement ratio is exceeded. The drum shall be turned anadditional 30 revolutions, or more, if necessary, until the added water is uniformlymixed into the concrete. Water shall not be added to the batch at any later time.

C. Ready-mix or transit-mixed concrete shall be transported to the site in watertightagitator or mixer trucks loaded not in excess of rated capacities for the respectiveconditions as stated on the nameplate. Discharge at the site shall be within 1-1/2 hoursafter cement was first introduced into the mix. Central mixed concrete shall beplant-mixed a minimum of 1-1/2 minutes per batch and then shall be truck-mixed oragitated a minimum of 8 minutes. Agitation shall begin immediately after thepre-mixed concrete is placed in the truck and shall continue without interruption untildischarge. Transit-mixed concrete shall be mixed at mixing speed for at least 10minutes immediately after charging the truck, followed by agitation withoutinterruption until discharged.

D. All central plant and rolling stock equipment and methods shall conform to the latestTruck Mixer and Agitator Standards of the Truck Mixer Manufacturers' Bureau of theNational Ready-Mixed Concrete Association, as well as ACI 304 and ASTM C94.

E. Attention is called to the importance of dispatching trucks from the batching plant sothat they shall arrive at the site of the work just before the concrete is required, thusavoiding excessive mixing of concrete while waiting or delays in placing successivelayers of concrete in the forms.

F. Concrete shall be discharged within 1-1/2 hours after introduction of the cement to theaggregates, except that when the concrete temperature exceeds 85 degrees F, this timeshall be reduced to 45 minutes. Concrete shall be placed within 15 minutes after it hasbeen discharged from the truck.

G. No water shall be added on the jobsite, unless the mix ticket clearly stipulatemaximum of water that can be added at the site. Only concrete mix truck operator canadd the measured amount of water at the site, if allowed in the mix.

H. Retempering of concrete which has partially hardened, that is, mixing with or withoutadditional cement, aggregates, or water, will not be permitted.

I. Temperature and Mixing Time Control:


1. In cold weather, maintain the as-mixed temperature of the concrete andconcrete temperatures at the time of placement in the forms as indicated inTable 033000-2.

2. If water or aggregate has been heated, combine water with aggregate in themixer before cement is added. Do not add cement to mixtures of water andaggregate when the temperature of the mixture is greater than 90 degrees F.

3. In hot weather, cool ingredients before mixing to maintain temperature of theconcrete below the maximum placing temperature of 90 degrees F. Ifnecessary, substitute well-crushed ice for all or part of the mixing water.

4. The maximum time interval between the addition of mixing water and/orcement to the batch, and the placing of concrete in the forms shall not exceedthe following:

2.01 TABLE 03300-2

AIR OR CONCRETE TEMPERATURE MAXIMUM TIME(WHICHEVER IS HIGHER)

80 degrees F to 90 degrees F 45 minutes70 degrees F to 79 degrees F 60 minutes40 degrees F to 69 degrees F 90 minutes

If an approved mid or high range water reducer (plasticizer) is used to produceplasticized concrete, the maximum time interval shall not exceed 90 minutes orother appropriate time such that workability and Contractor’s ability to properlyplace the concrete will not be adversely compromised.

J. Mix polymer modified cement based floor leveler in strict accordance with productmanufacturer’s written instruction.

3.07 PLACING CONCRETE

A. Remove water and foreign matter from forms and substrate and, except in freezingweather or as otherwise directed, thoroughly wet wood forms just prior to placingconcrete. Place no concrete on frozen substrate and provide adequate protectionagainst frost action during freezing weather.

B. To secure full bond at construction joints as well as palacing new concrete againstexisting concrete, surfaces of concrete already placed, including vertical and inclinedsurfaces, shall be thoroughly cleaned of foreign materials and laitance, roughened withsuitable tools such as chipping hammers or wire brushes, and re-cleaned by stream ofwater or compressed air. Well before new concrete is deposited, joints shall besaturated with water. After free or glistening water disappears joints shall be giventhorough coating of neat cement slurry mixed to consistency of very heavy paste.


Surface shall receive coating of approximately one-eighth inch thick; this shall bescrubbed in by means of stiff bristle brushes. New concrete shall be deposited beforeneat cement dries or changes color.

C. Do not place concrete having slump outside of allowable slump range.

D. Transport concrete from mixer to place of final deposit as rapidly as practical bymethods which prevent separation of ingredients and displacement of reinforcement,and which avoid rehandling. Deposit no partially hardened concrete.

E. Concrete shall be placed in such manner as to prevent segregation, and accumulationsof hardened concrete on forms or reinforcement above mass of concrete being placed.To achieve this end, suitable hoppers, spouts with restricted outlets and tremies shallbe used as required.

F. During and immediately after depositing, concrete shall be thoroughly compacted bymeans of internal type mechanical vibrators or other tools, or by spading to producerequired quality of finish.

G. Cold joints, particularly in exposed concrete, including "honeycomb", areunacceptable. If they occur in concrete surfaces exposed to view, Engineer willrequire that entire section in which blemish occurs be removed and replaced with newmaterials at Contractor's expense.

H. Chutes, hoppers, spouts, adjacent work, etc. shall be thoroughly cleaned before andafter each run and water and debris shall be discharged outside form.

I. Unless otherwise noted, the work begun on any day shall be completed in daylight ofthe same day.

J. Concrete Placement During Cold Weather:

1. For this Specification, cold weather is defined as a period when for more thanthree successive days, the average daily outdoor temperature drops below 40degrees F. The average daily temperature shall be calculated as the average ofthe highest and the lowest temperature during the period from midnight tomidnight

2. Concrete placed during cold weather shall be batched, delivered, placed, curedand protected to compliance with the recommendations of ACI 306R and theadditional requirements of this section.

3. All details of Contractor's handling and protecting of concrete during freezingweather shall be subject to approval. All procedures shall be in accordancewith provisions of ACI 306. Cold weather concreting shall not begin until thework plan is acceptable to the Engineer.


4. Concrete shall not be placed on frozen substrate, and no frozen material ormaterial containing ice shall be used. Materials for concrete shall be heatedwhen concrete is mixed, placed, or cured when the mean daily temperature isbelow 40oF., or is expected to fall to below 40oF., within 72 hours, and theconcrete after placing shall be protected by covering, heat, or both. Noaccelerant shall be used to prevent freezing.

5. The temperature of concrete surfaces shall not be permitted to drop below 50degrees F. for at least 7 days after placement of the concrete.

K. Concrete Placement During Hot Weather:

1. For this Specification, hot weather is defined as any combination of high airtemperatures, low relative humidity, and wind velocity that produces a rate ofevaporation as estimated in ACI 305R, approaching or exceeding 0.2 poundsper square foot per hour.

2. Concrete just placed shall be protected from the direct rays of the sun and theforms and reinforcement just prior to placing shall be sprinkled with coldwater. The Contractor shall make every effort to minimize delays, which willresult in excessive mixing of the concrete after arrival on the job.

3. During periods of excessively hot weather (90oF or above) ingredients in theconcrete shall be cooled insofar as possible and cold mixing water shall beused to maintain the temperature of the concrete at permissible levels all inaccordance with the provisions of ACI 305. Any concrete with a temperatureabove 90oF when ready for placement will not be acceptable, and will berejected. Temperature records shall be maintained throughout the period of hotweather giving air temperature, general weather conditions (calm, windy, clear,cloudy, etc.) and relative humidity. The record shall include checks ontemperature of concrete as delivered and after placing in forms. Data shouldbe correlated with the progress of the work so that conditions surrounding theconstruction of any part of the structure can be ascertained.

4. Cover reinforcing steel with water-soaked burlap if it becomes too hot, so thatsteel temperature will not exceed the ambient air temperature immediatelybefore embedment in concrete.

5. Wet form, particularly metal deck, before placing concrete.

L. Keep temperature record showing date and outside temperature for concretingoperation. Thermometer reading shall be taken at start of work in morning, at noon,and again late in afternoon. Locations of concrete placed during such periods shalllikewise be recorded, in such manner as to show any effect temperatures may have hadon construction. Copies of temperature record shall be distributed daily to theEngineer.


3.08 FINISHING OF UNFORMED CONCRETE SURFACES

A. Concrete shall be compacted with internal vibrators and screeded to the establishedgrades. Unless designated otherwise, top of concrete curb shall have a troweled finishas specified in Section ll.7 of ACI 30l. Troweled finishes shall conform to therequirements of "Class A Tolerances,"

3.09 CONCRETE FINISH SCHEDULES

A. Finishes to the concrete for the following conditions shall be as scheduled below andfurther specified herein:

1. Steel trowel finish.

3.10 REPAIRING OF UNFORMED CONCRETE SURFACES

A. As soon as the forms have been stripped and the concrete surfaces exposed fins andother projections shall be removed, recesses left by the removal of form ties shall befilled, and surface defects which do not impair structural strength shall be repaired.Clean all exposed concrete surfaces and adjoining work stained by leakage ofconcrete.

3.11 CURING AND PROTECTION

A. When concrete is placed at or below ambient air temperatures of 40 degrees F. orwhenever in opinion of Engineer, such or lower temperatures are likely to occurwithin 48 hours after placement of concrete, cold weather concreting procedures,according to ACI 306 and as specified herein, shall be followed. To this end, entirearea affected shall be protected by adequate housing or covering, and heating. No salt,chemicals or other foreign materials shall be used in the mix to lower freezing point ofconcrete.

B. Protect concrete work against injury from heat, cold, and defacement of any natureduring construction operations.

C. Concrete shall be treated and protected immediately after concreting or cementfinishing is completed, to provide continuous moist curing above 50 degrees F. for atleast seven days, regardless of ambient air temperatures.

D. Keep permanent temperature record showing date and outside temperature forconcreting operations. Thermometer readings shall be taken at start of work inmorning, at noon, and again late in afternoon. Locations of concrete placed duringsuch periods shall likewise be recorded, in such manner as to show any effecttemperatures may have had on construction. Copies of temperature record shall bedistributed daily to Engineer.


E. Immediately after placement, concrete shall be protected from premature dryingextremes in temperatures, rapid temperature change, mechanical injury and injuryfrom rain and flowing water. All materials and equipment needed for adequate curingand protection shall be available and at the placement prior to placing concrete. Nofire or excessive heat shall be permitted near or in direct contact with the concrete atany time. All curbs shall be wet cured.

3.12 REMOVAL OF FORMWORK, SHORING AND RESHORING

A. Contractor shall be responsible for proper removal of formwork, shoring, andreshoring.

3.13 CLEANING

A. Concrete surfaces shall be cleaned of objectionable stains as determined by theEngineer. Materials containing acid in any form or methods which will damage "skin"of concrete surfaces shall not be employed, except where otherwise specified.

3.14 FAILURE TO MEET REQUIREMENTS:

A. The Engineer shall have the right to reject concrete represented by low strength testsor to agree to further testing of the concrete. Rejected concrete shall be promptlyremoved and replaced with concrete conforming to the specification. The decision asto whether substandard concrete is to be accepted or rejected or additional tests shallbe conducted shall be final. All direct and indirect costs associated with further curingand testing of the concrete shall be at the Contractor's expense.

B. If the Engineer agrees to consider further curing and/or testing of the concrete beforemaking a final decision, the Contractor shall submit a detailed plan, includingproposed criteria for acceptance of the concrete. The plan may include additionalcuring of the concrete, drilling and testing of cores, load testing of the structure, or acombination.

C. If additional curing is permitted before further inspection and testing, the Contractorshall provide any necessary materials and labor to further cure the suspect concrete.

D. If drilling and testing of cores is permitted, the Contractor shall be responsible forobtaining the cores, including provision of all incidental equipment as may berequired. If additional curing is permitted, cores shall be drilled after the curingperiod, and shall be in accordance with ASTM Methods C39 and C42. The Contractorshall repair all core holes.

END OF SECTION