ACI FIELD GRADE 1 EXAM QUESTIONS AND ANSWERS

ACI FIELD GRADE 1 EXAM QUESTIONS AND ANSWERS Collecting a representative sample of concrete to be tested is as important as executing the test methods to obtain. - Answer- Accurate Results This practice covers sampling from five types of equipment, which are ___________, ___________, __________, __________, and __________. - Answer- stationary mixers, paving mixers, revolving truck mixers,continuous mixers. The elapsed time between obtaining the first and final portions of a composite sample shall not exceed. - Answer- 15 minutes Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the sample. True of False? - Answer- True Start the tests for slump, temperature, and air content within how many minutes after obtaining the final portion of the composite sample? - Answer- 5 Minutes Start molding specimens for strength tests within how many minutes after fabricating the composite sample? - Answer- 15 Minutes The concrete sample must be protected from contamination and _____. - Answer- Rapid Evaporation The minimum size sample for making strength test specimens is. - Answer- one cubic foot When sampling from a stationary mixer, the batch must be sampled at _____ or more regularly spaced intervals during discharge of the middle portion of the batch - Answer- 2 when sampling from a paving mixer, obtain samples from at least _______ different portions of the pile and combine them into one composite sample for test purposes. - Answer- 5 When sampling from a revolving drum truck mixer, concrete must be sampled at a minimum of _____ regularly spaced intervals during discharge of the middle portion of this batch. - Answer- 2 Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the mixer at the job site. True or False? - Answer- False When the concrete contains aggregate larger than allowed for the slump test, the large aggregate must be _____. - Answer- wet seived The stem of the thermometer is submerged a minimum of _________ into the freshly mixed concrete. - Answer- 3 in (75 mm) The thermometer shall be capable of accurately measuring the temperature of freshly mixed concrete to ___________ throughout a range of ____________ . - Answer- 1 degree F, 30 to 120 degree F