ACI Concrete Field Testing Technician Grade 1 Exam Questions and Answers 100% Correct

ACI Concrete Field Testing Technician Grade 1 Exam Questions and Answers 100% Correct 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 4 types of equipment: - Answer- stationary, paving, revolving truck, continuous 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 before beginning tests on the sample. True or False? - Answer- True Start tests for slump, temperature, and air content within _____ after obtaining the final portion of the composite sample - Answer- 5 minutes Start molding specimens for strength tests within _______ after fabricating the composite sample - Answer- 15 minutes The concrete sample must be protected from contamination and - Answer- evaporation the minimum size sample for making strength test specimens is - Answer- 1 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- two 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- five When sampling from a revolving truck mixer, sample the concrete by collecting ____ or more portions take at regularly spaced intervals during discharge of the middle portion of the batch. - Answer- two 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 that permitted for a particular test method, the sample of concrete must be ________ before making the test - Answer- wet screened What must occur before a sample of concrete can be taken from a revolving drum mixer? - Answer- all water and admixtures must be added to the mixer When sampling from a stationary or revolving drum mixer, what is collected and when is it taken during discharge? - Answer- - in two or more portions of concrete - at regularly spaced intervals - from the middle of the batch how are the sample portions obtained from the discharge stream of a stationary or revolving drum mixer? - Answer- - repeatedly pass a receptacle through the entire discharge stream - completely divert the discharge stream into a sample container Describe the procedure for collecting a sample from a paving mixer - Answer- - discharge the contents of the paving mixer - obtain the samples from at least 5 different portions of the pile What is the minimum size for a sample when strength test specimens are to be molded? - Answer- 1 cubic foot