ACI Concrete Field Testing Technician Grade I Certification Practice Test | Complete Practice Questions with Detailed Answers & Rationales - Latest Edition Updated 2026/2027

ACI Concrete Field Testing Technician Grade I
Certification Practice Test | Complete Practice
Questions with Detailed Answers & Rationales -
Latest Edition Updated 2026/2027

Question 1
A 6 by 12 in [150 mm by 300 mm] cylinder mold can be used for concrete containing
aggregate with particles not exceeding in size, without the need for wet sieving the
concrete.
Answer: 2 in. [50 mm]. ✔✔

Rationale: A 6x12 inch cylinder can accommodate aggregate up to 2 inches in size
without requiring wet sieving, as the mold diameter is three times the maximum
aggregate size.


Question 2
According to ASTM C1064, what is one reason to take the temperature of concrete?
Answer: Verify conformance to a specified requirement for temperature of concrete.
✔✔

Rationale: Temperature measurement ensures concrete meets specification
requirements for placement temperature.


Question 3
After completing the strike-off procedure, what must be done before weighing the
measure and sample?
Answer: Clean off any excess concrete. ✔✔

Rationale: The outside of the measure must be cleaned to ensure accurate weight
measurement.


Question 4
After consolidation of the final layer, an excess of concrete above the top of the measure
is considered optimum.
Answer: 1/8 in. [3 mm]. ✔✔

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,Rationale: A slight excess of 1/8 inch allows for proper strike-off and ensures the
measure is completely filled.


Question 5
After molding test specimens, you should wait two hours before moving them to the
location of initial storage. True or False?
Answer: False; the specimens must be moved immediately. ✔✔

Rationale: Specimens must be moved to initial storage immediately after molding to
prevent moisture loss and damage.


Question 6
After rodding each layer, what should be done to the measure before adding another
layer of concrete?
Answer: Tap the sides of the measure smartly 10 to 15 times with the mallet. ✔✔

Rationale: Tapping releases entrapped air and consolidates the concrete for accurate
air content measurement.


Question 7
After the final rodding, the sides of the slump mold should be tapped lightly with the
tamping rod. True or False?
Answer: False. ✔✔

Rationale: Tapping the sides of the slump mold can artificially consolidate the
concrete and reduce the slump measurement.


Question 8
After the temperature of the concrete is read, what is required?
Answer: Reporting of temperature. ✔✔

Rationale: The temperature reading must be documented and reported as part of
quality control records.


Question 9
Air meter bowls used for this test must conform to ASTM and be calibrated for volume


pg. 2

, according to ASTM.
Answer: C231, C29. ✔✔

Rationale: Air meter bowls are specified by ASTM C231 and calibrated per ASTM C29
for accurate volume measurement.


Question 10
The approximate concrete depth (in vertical distance) after placing the first layer is and
the second layer is.
Answer: 2 5/8 in. [70 mm], 6 1/8 in. [160 mm]. ✔✔

Rationale: These depths correspond to one-third and two-thirds of the slump cone
height (12 inches) respectively.


Question 11
ASTM Method gives standardized requirements for and of test specimens.
Answer: Making, curing, protecting, transporting. ✔✔

Rationale: ASTM C31 covers all aspects of specimen handling from molding to testing.


Question 12
At the end of the procedure, the air meter is.
Answer: Disassembled and its contents examined. ✔✔

Rationale: Disassembly allows inspection for undisturbed concrete that would
invalidate the test.


Question 13
The composite sample for a paving mixer must represent a minimum of different
portions of the batch of concrete taken from the pile after discharge.
Answer: 5. ✔✔

Rationale: Five portions from the discharge pile ensure a representative sample of the
entire batch.


Question 14
A composite sample of concrete is required even if the only purpose for obtaining the

pg. 3