Heavy Highway Exam Solved Correctly

Heavy Highway Exam Solved Correctly Two types of Asphalt plants - Answer- Batch Plant and Drum Plant Measuring the loose uncompacated void content of sand is to - Answer- determine angularity of fine aggregate Rounded sand particle sample has - Answer- lower void, and are less angular For HMA concrete, beach sand is better than manufactured sand? - Answer- FALSE Sand for "loose uncomplicated void content" test, should be washed? - Answer- TRUE Who should do the "Consensus" property test in their asphalt labs? - Answer- Contractor Who should do the "Source" property test in their labs? - Answer- Quarry Which of the following is a "Consensus" property? - Answer- Angularity The major bitumen used in hot-mix asphalt is called - Answer- Binder and Asphalt Cement Which property is most important for asphalt binder - Answer- Viscosity- temperature relationship Viscosity decreases as temperature increases - Answer- TRUE PGAC grade stands for - Answer- Performance Grade Asphalt Cement PGAC 64-10 means - Answer- 64c - -10c Nuclear Gauge can be used to test the density and moisture content of - Answer- Subgrade Soil, Granular Base, HMA When testing the compaction value, a reference value needs to be input to the gauge - Answer- true The refereed value is obtained from lab testing or field testing? - Answer- Lab Testing The nuclear gauge poses danger of radiation to the field technician? - Answer- No The gauge can tell you the wet density and dry density of the materials being tested - Answer- yes Density should be conducted as soon after the compaction operation is complete. Why? - Answer- Temperature The major contributor to asphalt pavement rutting is - Answer- aggregate Rutting can be - Answer- HMA's mixture's problem, or Granular/subbase's problem The technical requirements for aggregate used in HMA is _________ than those of the aggregate used in road base and subbase - Answer- More rigorous The gradation of aggregate for HMA has _______ than that of granular base/subbase aggregate. - Answer- narrower band Flat or elongated is used in HMA for - Answer- Coarse & fine aggregate For fine aggregate in HMA - Answer- Uncompacted voids is used Sand equivalent test is to check the - Answer- clay content In hot mix asphalt plant, job control grading band is - Answer- narrower than specification grading band The major contributor to low temp. cracking is - Answer- asphalt binder SGC simulates - Answer- traffic actions What test can link lab specimens and field performance - Answer- APA when the asphalt lab completes the mix design the plant starts - Answer- produce the mix the aggregates _____ be dried before feed to the mixer - Answer- need to