ACI Concrete Field Testing Technician Grade 1 Completely Solved!

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 me