Inspects concrete plants and redi-mix trucks to determine if they meet specifications. Runs asphalt extractions to check asphalt content and gradation according to established specifications. Conducts trial mixes at the laboratory for the bituminous or concrete mix designs to be used at the mixing plants. Checks concrete cover over bridge deck reinforcing steel using the rolling pacometer.
Verifies batch weights, checks feeder for obstructions, and ensures use of appropriate materials.
Samples hot bin materials and checks bins for worn screens or holes between partitions. Verifies batch weight water to cement ratios for concrete using the microwave procedure. Checks proportions of cold material bins and monitors delivery of uniform specification material. Reports data relating to feeder controls, asphalt scales, aggregate scales, and temperature readiness on a daily basis. OR in operating complex machines.