ACI GRADE 1 WRITTEN EXAM LATEST 2023-2024
ACTUAL EXAM 200 QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES (VERIFIED
ANSWERS) |ALREADY GRADED A+
Sampling by this practice covers procedures for obtaining representative samples, on which tests are to
be performed to determine ___ with quality requirements of the specifications listed under which the
concrete is furnished (C172/C172M-17 = Sampling Freshly Mixed Concrete) - ANSWER-Compliance
This practice covers sampling from five types of equipment which are... (C172/C172M-17 = Sampling
Freshly Mixed Concrete) - ANSWER-Stationary, paving, revolving drum, continous, and open top mixers
The elapsed time between obtaining the first and final portions of a composite sample shall not exceed...
(C172/C172M-17 = Sampling Freshly Mixed Concrete) - ANSWER-15 mins
T or F: Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample
(C172/C172M-17 = Sampling Freshly Mixed Concrete) - ANSWER-True
Start tests for slump, temperature, and air content within ___ after obtaining the final portion of the
composite sample (C172/C172M-17 = Sampling Freshly Mixed Concrete) - ANSWER-5
Start molding specific ends for strength tests within ___ after fabricating the composite sample
(C172/C172M-17 = Sampling Freshly Mixed Concrete) - ANSWER-15
The concrete sample must be protected from contamination and ... (C172/C172M-17 = Sampling Freshly
Mixed Concrete) - ANSWER-Rapid evaporation (also sun and wind)
The minimum size sample for making strength test specimens is ... (C172/C172M-17 = Sampling Freshly
Mixed Concrete) - ANSWER-28 L (aka 1 ft3)
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 (C172/C172M-17 = Sampling Freshly Mixed
Concrete) - ANSWER-2
,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 (C172/C172M-17 = Sampling Freshly Mixed
Concrete) - ANSWER-5
When sampling from a revolving drum truck mixer, sample the concrete by collecting ___ or more
portions take at regularly spaced intervals during discharge of the middle portion of the batch.
(C172/C172M-17 = Sampling Freshly Mixed Concrete) - ANSWER-2
T or F: Concrete samples from a truck mixer must be obtained before any water or admixtures are added
to the mixer at the job site. (C172/C172M-17 = Sampling Freshly Mixed Concrete) - ANSWER-F
The composite sample from a truck mixer must be obtained from the ___ portion of the batch
(C172/C172M-17 = Sampling Freshly Mixed Concrete) - ANSWER-Middle
When the concrete contains aggregate larger than that permitted for a particular test method, the
sample of concrete must be _____ before making the test. (C172/C172M-17 = Sampling Freshly Mixed
Concrete) - ANSWER-Wet Sieved
The end of the temperature sensing portion of the temperature measuring device is Submerged a
minimum of ____ into the freshly mixed concrete (C1064/C1064M-17, Temperature of Freshly Mixed
Hydraulic-cement concrete) - ANSWER-75 mm (3 in)
The temperature measuring device shall be capable of accurately measuring the temperature of freshly
mixed concrete to ____ throughout a range of ____. (C1064/C1064M-17, Temperature of Freshly Mixed
Hydraulic-cement concrete) - ANSWER-+/- 0.5 C, 0 to 50 C (30 to 120 F)
The temperature measuring device shall be verified ___, or whenever there is a question of ___.
(C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - ANSWER-Annually,
accuracy
T or F: The temperature of concrete may be measured in a wheelbarrow (C1064/C1064M-17,
Temperature of Freshly Mixed Hydraulic-cement concrete) - ANSWER-True
,T or F: The temperature of concrete may be measured in a wall form. (C1064/C1064M-17, Temperature
of Freshly Mixed Hydraulic-cement concrete) - ANSWER-True
T or F: A composite sample of concrete is required even if the only purpose for obtaining the sample is
to determine temperature. (C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement
concrete) - ANSWER-False
What must be done to the sample containers prior to sampling the concrete? (C1064/C1064M-17,
Temperature of Freshly Mixed Hydraulic-cement concrete) - ANSWER-Dampened (with water)
What must be done to the concrete surrounding the temperature measuring after the device is
submerged in the fresh concrete? (C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement
concrete) - ANSWER-Gently press the concrete around the temperature measuring device at the surface
of the concrete (to remove air voids)
How long must the measuring device remain in the freshly mixed concrete? (C1064/C1064M-17,
Temperature of Freshly Mixed Hydraulic-cement concrete) - ANSWER-At least 2 mins, but not more than
5 minutes
After the temperature of the concrete is read, what is then required? (C1064/C1064M-17, Temperature
of Freshly Mixed Hydraulic-cement concrete) - ANSWER-Reporting of temperature
The temperature of the concrete is reported to the nearest... (C1064/C1064M-17, Temperature of
Freshly Mixed Hydraulic-cement concrete) - ANSWER-0.5 C (1 F)
According to Test Method C1064/C1064M, what is one reason to take the temperature of concrete?
(C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - ANSWER-Verify
conformance to a specified requirement for temperature of concretely
T or F: A maximum temperature of freshly mixed concrete is specified in ASTM C1064. (C1064/C1064M-
17, Temperature of Freshly Mixed Hydraulic-cement concrete) - ANSWER-False
T or F: The sample of concrete used for temperature determination must be rodded 25 times.
(C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - ANSWER-False (not
rodded at all)
, The slump test is applicable to plastic concrete with a maximum size aggregate of _____. (C143/C143M -
15a, Slump of Hydraulic-Cement Concrete) - ANSWER-1.5 in (37.5 mm)
When the concrete contains aggregate larger than allowed for the slump test, the large aggregate must
be _____. (C143/C143M - 15a, Slump of Hydraulic-Cement Concrete) - ANSWER-Removed by wet surfing
the sample over 1.5 in (37.5 mm) sieve
The mold for making the slump test is in the shape of _____. (C143/C143M - 15a, Slump of Hydraulic-
Cement Concrete) - ANSWER-The frustum of a cone
The height of the slump mold is _____. (C143/C143M - 15a, Slump of Hydraulic-Cement Concrete) -
ANSWER-12 in (300 mm)
T or F: The interior surface of the slump mold is allowed to have minor irregularities. - ANSWER-False
For use in the slump test, the tamping end or both ends of the tamping rod must be ___. (C143/C143M -
15a, Slump of Hydraulic-Cement Concrete) - ANSWER-Rounded to a hemispherical tip
The sample of concrete for use in making the slump test must be obtained in accordance with Practice
___. (C143/C143M - 15a, Slump of Hydraulic-Cement Concrete) - ANSWER-C172/C172M
T or F: The slump mold should be in a dry condition before beginning the test. - ANSWER-False
The surface on which the slump mold will be placed must be _____. (C143/C143M - 15a, Slump of
Hydraulic-Cement Concrete) - ANSWER-Flat, moist, nonabsorbent, and rigid
The slump mold is filled in ___ layers. (C143/C143M - 15a, Slump of Hydraulic-Cement Concrete) -
ANSWER-3
Each layer should fill approximately _____ the volume of the mold. (C143/C143M - 15a, Slump of
Hydraulic-Cement Concrete) - ANSWER-1/3
