ACI Concrete Strength Testing Technician - Test Method C39/C39M questions n answers

ACI Concrete Strength Testing Technician - Test Method C39/C39M False; have a density of more than 800 kg/m3 (50 lb/ft3) - correct answer This test method measures the compressive strength of cylindrical concrete specimens that have a density of less than 800 kg/m3 (50 lb/ft3). True or False? False; a prescribed rate - correct answer Test Method C39/C39M consists of applying a compressive axial load to molded cylinders or cores at any rate until failure occurs. True or False? Shape, mixing, moisture - correct answer Results obtained from the compressive strength test method will depend on many things, such as the size and _____ of the specimen, batching, _____ procedures, the age, temperature, and _____ conditions during curing. Compressive strength - correct answer This test method is used to determine _____ _____ of cylindrical specimens. 13, relocation, repairs, accuracy - correct answer The calibration of the testing machines must be verified under four conditions: within _____ months of the last calibration, upon original installation or after _____, after making _____ or adjustments, and whenever there is reason to suspect the _____ of the indicated loads. False; apply the load continuously - correct answer The machine must be power operated and apply the load intermittently. True or False? True - correct answer Supplemental means of loading for calibration may be power or hand operated. True or False? +/-1.0% - correct answer The percentage of error for loads used in the testing machine should not exceed _____ of the indicated load.