ACI Concrete I questions with 100% correct answers 2024/2025

ACI Concrete I**What Must occur before a sample of concrete can be take from a revolving drum mixer? - correct 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? ** - correct answer In two or more portions of concrete, At regularly spaced intervals, from the middle of the batch. How are the samples obtained from the discharge stream of a stationary or revolving drum mixer? ** - correct 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.** - correct answer Discharge the contents of the paving mixer, Obtain samples from at least five different portions of the piles. What is the minimum size for a sample when strength test specimens are to be molded?** - correct answer 1 Cubic Foot What is the maximum allowable time between obtaining the first and final portions of the composite sample?** - correct answer 15min What action is required after the individual concrete samples have been transported to the place when tests are to be performed?** - correct answer Combine and Remix the samples with a shovel. What should be done if the concrete contains aggregate larger than is appropriate for the size of the molds or equipment being used?** - correct answer Wet sieving Start the tests for slump, temperature, and air content within how many minutes after obtaining the final portion of the composite sample?** - correct answer 5 min