ACI Concrete Test Questions and Answers | Verified & Updated 2024

ACI Concrete Test Questions and Answers | Verified & Updated 2024 T/F: a liquid in glass thermometer that is certifiably accurate and traceable to the NIST is required to verify concrete thermometers - Answer ️️ -True T/F: The Thermometer must remain in concrete for a minimum of 3 minutes - Answer ️️ - False T/F: ASTM 1064 requires a composite sample - Answer ️️ -False A thermometer can be used to record temperature if b) Thermometer is new B) Verified within one year after there was question of accuracy c) Accurate within 1 degree Fahrenheit d) All of the above e) B and C only - Answer ️️ -e) B and C only Place the thermometer in concrete a minimum of a) 1" b) 2" c) 3" d) 4" - Answer ️️ -c) 3" If aggregate concrete is less than 3" leave thermometer in concrete in test: a) 5 mins b) 10 mins c) Minimum of 2 mins d) maximum of 5 mins e) both c and d - Answer ️️ -e) both c and d How should you press the concrete around the thermometer? - Answer ️️ -Gently Record the temperature to the nearest ___ degree - Answer ️️ -1 degree Temperature measuring device should be verified _____________ or whenever there is a question of___________. - Answer ️️ -Annually; Accuracy 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 of revolving drum mixer,, what is collected and when is it taken during discharge? - Answer ️️ -Two or more portions of concrete; at regularly spaced intervals; from the middle of the batch When sampling from a stationary or revolving drum mixer sample portions are obtained by a) repeatedly passing a receptacle through the center of a discharge stream b) completely diverting the discharge steam into sample container c) Repeatedly passing a receptacle through the entire discharge stream d) both a & b e) Both b & c - Answer ️️ -- e) Both b & c Describe the procedure for collecting a sample from a paving mixer - Answer ️️ -Discharge the contents of the paving mixer; obtain samples from at least five different portions of the pile What is the minimum size for a sample when strength test specimens are molded - Answer ️️ - 1 cubic foot What action is required after the individual concrete samples have been transported to the place where tests are to be preformed? - Answer ️️ -Combine and remix the samples with a shovel What should be done if the concrete contains an aggregate larger than is appropriate for the size of the molds or equipment being used - Answer ️️ -Wet Sieving Start the test for slump, temperature, and air content within how many minutes after obtaining the final portion of the composite sample - Answer ️️ -5 mins Start molding specimens for strength tests within how many minutes after fabricating the composite sample - Answer ️️ -15 mins From what must the concrete sample be protected - Answer ️️ -Sun wind and rapid evaporation; contamination T/F: Remove the thermometer just before you read and record temperature - Answer ️️ -False The temperature for concrete a) Must not exceed 90 de