item 204 – portland cement stabilized road mix
Post on 28-Mar-2015
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Item 204 – Portland Cement Stabilized Road Mix Base Course
204.1 Description
• Foundation for surface source
- soil-aggregate
- Portland Cement
- Water
• In proper proportions
204.2 Materials Requirements
• Soil Aggregate
-conforms to Subsection 203.2.1
• Portland Cement
- conforms to Item 700
• Water
- conforms to Item 714
204.2 Materials Requirements
• Proportioning
- amount of cement added to soil-aggregate is from 6 – 10 mass percent of dry soil.
- exact percentage shall be fixed by the Engineer based on preliminary tests and trial mixes.
• Strength Requirements
- conforms to Subsection 203.2.5
204.3 Construction Requirements
• prescribed under Subsections 203.3.1 through 203.3.10.
• in all cases, “lime” shall be deleted and replaced with “Portland Cement”
204.4 Method of Measurement
• PC Stabilized Road Mix Base Course
- in cubic meter
• Quantity to be paid shall be the design volume
• No allowance shall be given for mat’ls placed outside the design limit
• Trial sections shall be included
204.5 Basis of Payment
• Paid for at the Contract Unit Price for PC Stabilized Road Mix Base Course
• Full furnishing, all labor, equipment, tools and incidentals are included.
Item 205 – Asphalt Stabilized Road Mix Base Course
205.1 Description
• Foundation for Surface Course
- soil-aggregate
- asphaltic material
205.2 Material Requirements
• Soil-aggregates
- conforms to Item 703, Gradation A or B shall be used
• Asphaltic Material
- Anionic or Cationic Emulsified Asphalt, conforms to Item 702
205.2 Material Requirements
• Proportioning
- 4 – 7 mass percent of the dry soil-aggregate.
- exact percentage shall be fixed by the Engineer
• Strength Requirements
- conforms to Subsection 203.2.5
205.3 Construction Requirements
• Prescribed under Subsections 306.3.1 through 306.3.7
• In all cases, the word “aggregate” shall be deleted and replaced by “Soil-aggregate”
• Trial sections shall conform to Subsection 200.3.4
• Allowable tolerance shall be in accordance with Subsection 201.3.5
205.4 Method of Measurement
• Asphalt Stabilized Road Mix Base Course
- in cubic meters
• No allowance to be given for mat’ls placed outside the design limits
• Trial sections are included in the quantity
205.5 Basis of Payment
• Paid for at the Contract Unit Price for Asphalt Stabilized Road Mix Based Course
• Full furnishing, all labor, equipment, tools and incidentals are included.
Item 206 – Portland Cement Treated Plant Mix Base Course
206.1 Description
• Foundation for surface source
- soil-aggregate
- Portland Cement
- Water
mixed by a travel plant or in a central plant
• In proper proportions
206.2 Materials Requirements
• Same as 204.2.1 to 204.2.5
206.3 Construction Requirements
• Weather Limitations
- PC shall not be applied during windy, rainy, or impending bad weather.
• Travel Plant Method
- new soil aggregate shall be pulverized until 80 mass percent can pass through No.4 sieve
- Mat’ls retained on 50 mm sieve shall be removed
206.3 Construction Requirements
• Travel Plant Method
- subgrade/subbase shall support all equip required in the construction of the base course
- soil-aggregate to be treated be placed in a uniform windrow
- specified quantity of PC shall be applied uniformly
206.3 Construction Requirements
• Travel Plant Method
- mixing shall be accomplished by means of a mixer
- maximum of 2 hrs shall be permitted for wet mixing, laydown, and finishing
• Central Plant Method
- soil-aggregate shall be proportioned and mixed with cement and water in a central mixing plant.
206.3 Construction Requirements
• Spreading, Compacting and Finishing
- mixture shall be spread on a prepared and moistened subgrade/subbase
-no more than 60 mins shall elapse between start of mixing and start of compaction
- after spreading, compaction then finishing
206.3 Construction Requirements
• Protection, Curing and Maintenance
- completed cement shall be cured with a bituminous curing seal
• Trial Section
- same as 203.3.8
• Tolerances
- same as 203.3.9
• Traffic
- same as 203.3.10
206.4 Method of Measurement
• PC Treated Plant Mix Base Course
- in cubic meter
• Quantity to be paid shall be the design volume
• No allowance shall be given for mat’ls placed outside the design limit
• Trial sections shall be included
206.5 Basis of Payment
• Paid for at the Contract Unit Price for PC Treated Plant Mix Base Course
• Full furnishing, all labor, equipment, tools and incidentals are included.
Item 207 – Aggregate Stockpile
207.1 Description
• Furnishing and placing aggregate in stockpiles
207.2 Materials Requirements
• Conform to all requirements of specified Item Number
• Test for acceptance at the source
207.3 Construction Requirements
• shall be graded, shaped and compacted to a uniform cross section
• In accordance with Clause 65 and 67
207.4 Method of Measurement
• Aggregate Stockpile
- in cubic meter
207.5 Basis of Payment
• Paid for at the Contract Unit Price for Aggregate Stackpile
• Full furnishing, all labor, equipment, tools and incidentals are included.
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