ACI Concrete Field Testing Technician—Grade I
Exam With A+ Graded Solution(2026/2027)
1. According to ASTM C1064, the sensor of the temperature measuring
device must be submerged a minimum of how many inches into the
concrete?
Correct Answer: 3 inches.
2. What is the maximum allowed time between obtaining the first and last
portions of a composite sample per ASTM C172?
Correct Answer: 15 minutes.
3. When sampling from a stationary mixer, at what points should the two or
more portions of concrete be taken?
Correct Answer: At regularly spaced intervals during discharge of the
middle portion of the batch.
4. According to ASTM C143, what is the required shape of the slump mold?
Correct Answer: The frustum of a cone.
5. How many layers is the slump mold filled in?
Correct Answer: 3 layers.
6. What is the approximate volume of each layer when filling the slump
mold?
Correct Answer: One-third of the volume of the mold.
7. How many times must each layer of the slump test be rodded?
Correct Answer: 25 times.
8. According to ASTM C143, the slump test must be completed from the
start of filling to the removal of the mold within how many minutes?
Correct Answer: 2 1/2 minutes.
9. Slump is measured by determining the vertical distance between the top
of the mold and what part of the specimen?
Correct Answer: The original displaced center of the top surface.
10.To what nearest increment should the slump be reported?
Correct Answer: 1/4 inch.
, 11.When using the Pressure Method (ASTM C231), what is the maximum
size of aggregate allowed before wet sieving is required?
Correct Answer: 2 inches.
12.For aggregate larger than 2 inches in the pressure method, it must be
wet sieved over which sieve?
Correct Answer: 1 1/2 inch sieve.
13.What is the required weight of the mallet used to tap the sides of the
bowl for consolidation?
Correct Answer: 1.25 ± 0.50 lb.
14.In ASTM C138, how is the yield of a concrete batch calculated?
Correct Answer: Total mass of all materials batched divided by the
density of the concrete.
15.What is the standard temperature range for a thermometer used in
ASTM C1064?
Correct Answer: 30°F to 120°F (0°C to 50°C).
16.How often must the temperature measuring device be calibrated or
verified?
Correct Answer: Annually.
17.When testing for temperature, how long must the sensor remain in the
concrete?
Correct Answer: At least 2 minutes, but not more than 5 minutes.
18.To what nearest degree must the temperature of concrete be reported?
Correct Answer: 1°F (0.5°C).
19.True or False: A composite sample is required if only a temperature test
is being performed.
Correct Answer: False.
20.According to ASTM C172, tests for slump and air content must be started
within how many minutes after obtaining the final portion of the
composite sample?
Correct Answer: 5 minutes.
21.Molding of strength specimens (cylinders) must begin within how many
minutes after fabricating the composite sample?
Correct Answer: 15 minutes.
Exam With A+ Graded Solution(2026/2027)
1. According to ASTM C1064, the sensor of the temperature measuring
device must be submerged a minimum of how many inches into the
concrete?
Correct Answer: 3 inches.
2. What is the maximum allowed time between obtaining the first and last
portions of a composite sample per ASTM C172?
Correct Answer: 15 minutes.
3. When sampling from a stationary mixer, at what points should the two or
more portions of concrete be taken?
Correct Answer: At regularly spaced intervals during discharge of the
middle portion of the batch.
4. According to ASTM C143, what is the required shape of the slump mold?
Correct Answer: The frustum of a cone.
5. How many layers is the slump mold filled in?
Correct Answer: 3 layers.
6. What is the approximate volume of each layer when filling the slump
mold?
Correct Answer: One-third of the volume of the mold.
7. How many times must each layer of the slump test be rodded?
Correct Answer: 25 times.
8. According to ASTM C143, the slump test must be completed from the
start of filling to the removal of the mold within how many minutes?
Correct Answer: 2 1/2 minutes.
9. Slump is measured by determining the vertical distance between the top
of the mold and what part of the specimen?
Correct Answer: The original displaced center of the top surface.
10.To what nearest increment should the slump be reported?
Correct Answer: 1/4 inch.
, 11.When using the Pressure Method (ASTM C231), what is the maximum
size of aggregate allowed before wet sieving is required?
Correct Answer: 2 inches.
12.For aggregate larger than 2 inches in the pressure method, it must be
wet sieved over which sieve?
Correct Answer: 1 1/2 inch sieve.
13.What is the required weight of the mallet used to tap the sides of the
bowl for consolidation?
Correct Answer: 1.25 ± 0.50 lb.
14.In ASTM C138, how is the yield of a concrete batch calculated?
Correct Answer: Total mass of all materials batched divided by the
density of the concrete.
15.What is the standard temperature range for a thermometer used in
ASTM C1064?
Correct Answer: 30°F to 120°F (0°C to 50°C).
16.How often must the temperature measuring device be calibrated or
verified?
Correct Answer: Annually.
17.When testing for temperature, how long must the sensor remain in the
concrete?
Correct Answer: At least 2 minutes, but not more than 5 minutes.
18.To what nearest degree must the temperature of concrete be reported?
Correct Answer: 1°F (0.5°C).
19.True or False: A composite sample is required if only a temperature test
is being performed.
Correct Answer: False.
20.According to ASTM C172, tests for slump and air content must be started
within how many minutes after obtaining the final portion of the
composite sample?
Correct Answer: 5 minutes.
21.Molding of strength specimens (cylinders) must begin within how many
minutes after fabricating the composite sample?
Correct Answer: 15 minutes.
