ACI Concrete Field-Testing Technician Grade
I Certification Actual Exam V2 (Latest
Update ) Questions & Answers |
Grade A | 100% Correct
The Method of determining air content of concrete containing lightweight aggregate is the
pressure method. True or False?
✓ False Answer
When making a test cylinder from concrete being used in construction, the field technician must
also measure the slump of the concrete. True or False?
✓ True
While the technician is checking the slump of the concrete, there is a decided falling away or
shearing off of concrete from one side of the sample. What should the technician do?
✓ Disregard the test and retest on another portion of the sample
Preparation of specimens for transport includes
✓ Determining that at least 8 hours has elapsed since the final set
If the aggregate correction factor for a given source of fine and coarse aggregate is found to be
.2% in a pressure air meter, and an air content value of 5.0% is read on the gage of the same air
meter containing concrete with the same aggregate, what is the correct air content in %.
, ✓ 4.8% = 5.0 - 0.2
Strength test specimens transported from the field to the testing laboratory must be
✓ Protected from jarring, moisture loss, and freezing.
Test for slump and air content must be started within after obtaining the final portion of the
composite sample.
✓ 5 mins
The minimum size for samples to be used for strength tests is .
✓ 1 ft^3 = 28 L
For normal strength concretes, what temperature range must be maintained for test cylinders
during initial curing?
✓ 60-80 deg F
When the concrete contains large aggregate, the testing technician should wet-sieve the sample
before making density (unit weight) tests for use in yield computations. True or False?
✓ False
,When determining the temperature of fresh concrete, what is the minimum amount of concrete
cover in all directions around the sensor of the temperature measuring device?
✓ 3 in = 75 mm
The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold.
True or False?
✓ False
Unless specified otherwise, strength test specimens molded from concrete having a slump less
than 1 in. (25mm) must be consolidated by vibration. True or False?
✓ True
Tamping rod should be (what shape)?
✓ rounded
Start molding strength test specimens within (how many) minutes after fabricating the composite
sample.
✓ 15 mins
ASTM C173 specifies a minimum time requirement for inverting and agitating the meter to free
concrete from the base. True or False?
✓ True
, It is acceptable to fabricate a test specimen from the same concrete used for the air content test.
True or False?
✓ False
According to ASTM C138, what is the air content (in percent) of the following concrete batch?
The theoretical density computed on an air-free basis is 168 lb/ft^3 The density is 158 lb/ft^3
✓ 6.0%= [(168 - 158)/168] x 100
Representative samples are required for use in tests conducted for the purpose of determining
compliance with the specifications for concrete quality. True or False?
✓ True
After strike off of the measure used to determine density, a small quantity of concrete may be
added to correct a deficiency. True or False?
✓ False
Test cylinders may be capped with a thin layer of portland cement paste which is permitted to
harden and cure with the specimen. True or False?
✓ True
For concrete with aggregates less than 3 inches, the thermometer must remain in the fresh
concrete sample a minimum of 5 minutes or until the temperature reading stabilizes. (T or F)
✓ False (2-5 minutes)
I Certification Actual Exam V2 (Latest
Update ) Questions & Answers |
Grade A | 100% Correct
The Method of determining air content of concrete containing lightweight aggregate is the
pressure method. True or False?
✓ False Answer
When making a test cylinder from concrete being used in construction, the field technician must
also measure the slump of the concrete. True or False?
✓ True
While the technician is checking the slump of the concrete, there is a decided falling away or
shearing off of concrete from one side of the sample. What should the technician do?
✓ Disregard the test and retest on another portion of the sample
Preparation of specimens for transport includes
✓ Determining that at least 8 hours has elapsed since the final set
If the aggregate correction factor for a given source of fine and coarse aggregate is found to be
.2% in a pressure air meter, and an air content value of 5.0% is read on the gage of the same air
meter containing concrete with the same aggregate, what is the correct air content in %.
, ✓ 4.8% = 5.0 - 0.2
Strength test specimens transported from the field to the testing laboratory must be
✓ Protected from jarring, moisture loss, and freezing.
Test for slump and air content must be started within after obtaining the final portion of the
composite sample.
✓ 5 mins
The minimum size for samples to be used for strength tests is .
✓ 1 ft^3 = 28 L
For normal strength concretes, what temperature range must be maintained for test cylinders
during initial curing?
✓ 60-80 deg F
When the concrete contains large aggregate, the testing technician should wet-sieve the sample
before making density (unit weight) tests for use in yield computations. True or False?
✓ False
,When determining the temperature of fresh concrete, what is the minimum amount of concrete
cover in all directions around the sensor of the temperature measuring device?
✓ 3 in = 75 mm
The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold.
True or False?
✓ False
Unless specified otherwise, strength test specimens molded from concrete having a slump less
than 1 in. (25mm) must be consolidated by vibration. True or False?
✓ True
Tamping rod should be (what shape)?
✓ rounded
Start molding strength test specimens within (how many) minutes after fabricating the composite
sample.
✓ 15 mins
ASTM C173 specifies a minimum time requirement for inverting and agitating the meter to free
concrete from the base. True or False?
✓ True
, It is acceptable to fabricate a test specimen from the same concrete used for the air content test.
True or False?
✓ False
According to ASTM C138, what is the air content (in percent) of the following concrete batch?
The theoretical density computed on an air-free basis is 168 lb/ft^3 The density is 158 lb/ft^3
✓ 6.0%= [(168 - 158)/168] x 100
Representative samples are required for use in tests conducted for the purpose of determining
compliance with the specifications for concrete quality. True or False?
✓ True
After strike off of the measure used to determine density, a small quantity of concrete may be
added to correct a deficiency. True or False?
✓ False
Test cylinders may be capped with a thin layer of portland cement paste which is permitted to
harden and cure with the specimen. True or False?
✓ True
For concrete with aggregates less than 3 inches, the thermometer must remain in the fresh
concrete sample a minimum of 5 minutes or until the temperature reading stabilizes. (T or F)
✓ False (2-5 minutes)
