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ACI Concrete Test 2023 Questions and Answers
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ACI Concrete Test 2023 Questions and Answers
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ACI Concrete Test 2023 Questions and Answers T/F: a liquid in glass thermometer that is certifiably accurate and traceable to the NIST is required to verify concrete thermometers - Answer- TrueT/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 degrees/
b) Must not be below 40 degrees
c) Must be within 10 degrees of ambient temperature
d) Is determined by the specific contract documents for project - Answer- d) Is determined by the specific contract documents for the project
is it acceptable to measure temperature of freshly mixed concrete in a) A wheelbarrow b) transporting equitment c) forms
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