ACI- Concrete Field-Testing Technician - Grade 1 Questions and answers NEW!! 100% VERIFIED CORRECT 2025/2026

ACI- Concrete Field-Tes ng Technician - Grade 1
Ques ons and answers NEW!! 100% VERIFIED CORRECT
2025/2026
Q1. Start molding specimens for strength tests within 30 minutes a er fabrica ng the
composite sample.



A. True

B. False - Correct Answers B. False



ASTM C172 -Para (4.1.2) - Start molding.

specimens for strength tests within 15 min a er fabrica ng the

composite sample.



Q2. The maximum allowable me between obtaining the first and last por ons of the
composite sample may not exceed 5 minutes.



A. True

B. False - Correct Answers B. False



ASTM C172 - Para (4.1)- The elapsed me shall not exceed 15 min. between obtaining the first
and final por ons of the composite sample.



Q3. The composite concrete sample must be protected from sun, wind, contamina on and
rapid evapora on.



A. True

,B. False - Correct Answers A. True



ASTM C172 - Para (4.1.2)



Q4. If the concrete contains aggregates larger than those that are appropriate for a size of mold
or equipment used, the sample should be wet sieved before making the test.



A. True

B. False - Correct Answers A. True



ASTM C172- Para (6.1)



Q5. The composite sample should not be remixed before beginning any tests.



A. True

B. False - Correct Answers B. False



ASTM C172-Para (4.1.1) -The sample shall be combined and remixed with a shovel the minimum
amount necessary to ensure uniformity and compliance with the maximum me limits



Q6. Sampling should normally be performed, as the concrete is discharged from the mixer.



A. True

B. False - Correct Answers B. False



ASTM C172-Para (5). NOTE 2—Sampling should normally be performed as the concrete is
delivered from the mixer.

,To the conveying vehicle used to transport the

concrete to the forms; however, specifica ons may require other points of sampling, such as the
discharge of a concrete pump.



Q7. ASTM Method C172 includes sampling from sta onary mixers, paving mixers, truck mixers,
agitators, and non-agita ng equipment.



A. True

B. False - Correct Answers A. True



ASTM C172- Para (1.1)



Q8. A er sampling is completed, start the tests for slump and air content within:



A. 2 ½ minutes

B. 10 minutes

C. 15 minutes

D. None of the above - Correct Answers D. None of the above



ASTM C172- Para (4.1.2) Start tests for slump, temperature, and air content within 5 min a er
obtaining the final por on of the composite sample.



Q9. In any case, do not obtain samples un l:



A. All the water and admixtures have been added to the concrete

B. 200 revolu ons of the drum have been obtained

, C. ½ of the water has been added

D. None of the above - Correct Answers A. All the water and admixtures have been added to
the concrete.



ASTM C172- Para (5.2.3). In any case do not obtain samples un l a er all of the water has been
added to the mixer.



Q10. No samples shall be taken before_________ or a er_________ of the batch has been
discharged.



A. 10% or a er 90%

B. 20% or a er 90%

C. 20% or a er 80%

D. None of the above - Correct Answers A. 10% or a er 90%



ASTM C172- Para (5.2.1).



NOTE 3—No samples should be taken before 10 % or a er 90 % of the batch has been
discharged.



Due to the difficulty of determining the actual quan ty of concrete discharged, the intent is to
provide samples that are representa ve of widely separated por ons, but not the beginning
and the end of the load.



Q11. When strength tests are to be made, the minimum size of the composite sample shall be:



A. ¼ cubic foot

B. 1 cubic foot