Contractor Quality Control
The contractor shall perform all quality control tests including, but not limited to, tests on fine and course aggregates, moisture content, and slump.
For fine aggregates, a sieve analysis should be performed twice a day from randomly-sampled material from storage bins or conveyor belts in accordance with ASTM C 136. Moisture content of the fines should be tested in comparison with ASTM C 566 or ASTM C 70.
For course grain aggregates a sieve analysis should be made twice a day for each size of aggregate. Tests will be conducted using ASTM C 136 as guidelines from randomly sampled material.
The slump tests should be performed for each lot in accordance with ASTM C 143 from the material randomly sampled from trucks at the plant site.
CONTROL CHART LIMITS FOR SLUMP AND AIR CONTENT
Based on Sample Size n=4