Download - WELCOME N.C. DEPARTMENT OF TRANSPORTATION MATERIALS AND TESTS UNIT CONCRETE CERTIFICATION SCHOOL
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WELCOME
N.C. DEPARTMENT OF TRANSPORTATION
MATERIALS AND TESTS UNITCONCRETE CERTIFICATION SCHOOL
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CONCRETE MIX DESIGN
TECHNICIAN SCHOOL
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M& T CONTACTS WALTON JONES(RALEIGH) 919-733-7091 MARIA LONG (WILLIAMSTON) 252-792-
7627 DAN ALLEN (WILMINGTON) 910-371-6964 DARRELL LUMLEY(RALEIGH) 919-556-7606 HENRY TRAYWICK (FAYETTEVILLE) 910-486-1732 ROBERT FOSQUE(GREENSBORO) 336-334-3611 SANDRA POTTS(SALISBURY) 336-993-2300 MARK THOMAS (MATTHEWS) 704-847-1314 TRACH CHURCH(WILKESBORO) 336-903-9107 CHARLES BULLOCK(ASHEVILLE) 828-298-1516
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AME’s
HENRY TRAYWICK DIV 1,2,3,6 JESSICA SMITH DIV 4,5,7 PAM CARRIKER DIV 8,9,10 KEN HAMBY DIV 11,12,13,14
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INSTRUCTOR
WALTON JONES 919-733-7091
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PLEASETELEPHONES OFF OR ON VIBRATE
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BATHROOMS
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CLASS HOURS
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SCHEDULE DAY 1&2
Review Schools, Agg. Gradation, Wt.-Vol. Relationships DAY 3
Admixtures, Placing Conc., ACI Mix Design DAY 4
Fly Ash, Mix Design Variations, Hot & Cold Weather Conc. & Curing, Exam, Review
DAY 5
Math Exam
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PREREQUISITES FOR CLASS
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NCDOT BATCH TECHNICIAN CERTIFICATION MUST BE CURRENT, OR MUST HAVE SUCESSFULLY COMPLETED BATCH SCHOOL CLASSROOM PORTION
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QUESTIONS
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REVIEWConcrete Field & Batch
Technician School
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Review TopicsComponents Of Concrete
Moisture Calculations and Batch Weight Adjustments
Field Tests
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Components Of Concrete
Cement - The bonding agent. Sand - Gives workability to the mix. Stone - Filler material, aids in strengthening
the mix. Water - Causes a chemical reaction called
hydration. Air Agent - For freeze/thaw, durability Retarder - Slows setting time.
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Components Cont.
Water and Cementitious Materials - Portland cements, fly ash, slag.
Fine and Coarse Aggregates - Sands and stones (60-80% of mix).
Chemical Admixtures - Air entrainers, retarders, water reducers, super-plastizers.
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Components Cont.
Paste - A combination of cement, water, and entrained air.
Setting Time - The time that it takes for a cement paste to begin hardening.
Mortar - Paste and fine aggregates. Concrete - Mortar and coarse
aggregate.
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Aggregates 60% to 80% of the volume of the mix is
aggregates. Sand may be natural or manufactured and
it’s texture will be from fine to coarse. Stone may be angular from a quarry, or
rounded from a pit. Standard stone sizes for structural concrete
from Table 1005-1: #57, #67, and #78.
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Moisture Calculations & Batch Weight
Adjustments Calculate Total Moisture in fine and
coarse aggregate stockpiles. Calculate Free Moisture
Total Moisture - Absorbed Moisture Use Free Moisture to calculate batch
weight adjustments. Mix designs are based on SSD weights.
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TOTAL MOISTURE
Moisture on the surface and the moisture in the pours and capillaries of an aggregate.
Total Moisture is calculated by:
Wet Wt. - Dry Wt.
---------------------- X 100
Dry Wt.
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Determine Total Moisture
Given the following weights, determine the total moisture:
Wet Weight 555.4 grams
Dry Weight 523.2 grams
Is this a Fine or Coarse Aggregate sample?
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Answer555.4 - 523.2
------------------ X 100 = 6.2%
523.2
This is a Fine Aggregate sample
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Determine Total Moisture
Given the following weights, determine the total moisture:
Wet Weight 1534.2 grams
Dry Weight 1505.0 grams
Is this a Fine or Coarse Aggregate sample?
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ANSWER1534.2 - 1505.0
---------------------- X 100 = 1.9%
1505.0
This is a Coarse Aggregate Sample
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Determine Free Moisture
Given the following moistures, determine the Free Moisture:
Fine Agg. Total Moisture 6.2%
Absorbed Moisture 0.4%
Coarse Agg. Total Moisture 1.9%
Absorbed Moisture 0.7%
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ANSWERFine Aggregate:
6.2% - 0.4% = 5.8% FREE MOISTURE
Coarse Aggregate:
1.9% - 0.7% = 1.2% FREE MOISTURE
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Batch Weight Adjustment Problem
Mix design weights are as follows:
Cement 555 lbs
Sand 1222 lbs
Stone 1865 lbs
Water 290 lbs
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Sand Adjustment Using the FREE MOISTURE 5.2%, adjust
sand weight. 5.2 / 100 = 0.052 1222 X 0.052 = 63.5 lbs. (Water) 1222 + 64 = 1286 lbs.
Adjusted Sand Weight = 1286 lbs
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Stone Adjustment Using the FREE MOISTURE 3.6%,
adjust the stone weight. 3.6 / 100 = 0.036 1865 X 0.036 = 67.1 lbs. (Water) 1865 + 67 = 1932 lbs.
Adjusted Stone Wt. = 1932 lbs
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Water Adjustment
Total additional water from sand and stone.
64 lbs. + 67 lbs. = 131 lbs. 290 lbs. (design water) - 131 lbs. = 159
lbs.
Adjusted Water Wt. = 159 lbs.
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Corrected Batch Weight
Corrected weights for ONE cubic yard:
Cement 555 lbs.
Sand 1286 lbs.
Stone 1932 lbs.
Water 159 lbs. What are the weights for a 9 cubic yard
load?
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Pull Weights
For a 9 yard load - multiply batch weights for one yard load times 9.
Corrected weights for 9 cubic yard load:
Cement 4995 lbs.
Sand 11,574 lbs.
Stone 17,388 lbs.
Water 1431 lbs.
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BATCH TOLERANCES
CEMENT MUST BE BATCH WITHIN ± 1% OF MIX DESIGN WEIGHT
FLY ASH MUST BE BATCHED WITHIN ± 1% OF MIX DESIGN WEIGHT
SAND MUST BE BATCHED WITHIN ± 2% OF THE MOISTURED CORRECTED MIX DESIGN WEIGHT
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STONE MUST BE BATCHED WITHIN ± 2% OF THE MOISTURE ADJUSTED MIX DESIGN WEIGHT.
WATER MUST BE BATCHED WITHIN ± 1% OF THE MOISTURE ADJUSTED MIX DESIGN AMOUNT.
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BATCHING TOLERANCES
CEMENT- ± 1% FLY ASH - ± 1% SAND- ± 2% STONE- ± 2% WATER - ± 1%
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FIELD TEST
Sampling Freshly Mixed Concrete:AASHTO T-141 ASTM C-172
Slump Test:AASHTO T-119 ASTM C-143
Unit Weight:AASHTO T-121 ASTM C-138
Air Content with Pressure Air Meter:AASHTO T-152 ASTM C-231
Air Content by Volumetric Method:AASHTO T-196 ASTM C-173
Air Content by Chace Indicator:AASHTO T-199
Making and Curing Test Specimens:AASHTO T-23 ASTM C-31
Temperature of Freshly Mixed Concrete:ASTM C-1064
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NCDOT Certification Concrete Field Technician:
Qualified to perform concrete acceptance tests on NCDOT projects.
Certified as a “Grade 1 Field Test Technician” by ACI.
Concrete Batch Technician:
Certified to batch Ready Mixed, Precast, or Prestressed Concrete for NCDOT projects.
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What Does This Mean?
Anyone testing or batching concrete for a NCDOT project shall be certified.
A Field and Batch Technician should be properly trained, knowledgeable, and competent to perform their duties.
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Concrete Mix Design Technician
Learn how to perform Sieve Analysis, Fineness Modulus, Design Concrete Mixes using the Absolute Volume Method, and Vary Mixes using the 5% Deviation Method.
Pass this course and become certified to design and vary concrete mixes.
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BREAK