ACI Field Grade 1 Testing exam questions with actual
correct DETAILED ANSWERS
T/F The method of determining air content of concrete containing lightweight aggregate is the pressure
method. - ANSWER-False
T/F When making a test cylinder from concrete being used in construction, the field technician must also
measure the slump of the concrete. - ANSWER-True
T/F When making a test cylinder from concrete, there is a decided falling away or shearing off of
concrete from one side of the sample. What should the technician do? - ANSWER-Disregard test and
retest anther portion of the sample
preparation of specimens for transport include:
A. Determination that at least 8hr has elapsed since finial set
B. Ensure specimens have not been demolded
C. Allowing the specimen to air dry for at least 4hr - ANSWER-A. Determination that at least 8hr has
elapsed since finial set
If the aggregate correction factor for a given source of fine and coarse aggregate is found to be 0.2% 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? - ANSWER-4.8%
Strength test specimens transported from the field to the testing laboratory must be:
A. Protected from jarring
B. Protected from moisture loss
C. Protected from freezing
,D. A and B only
E. A, B, and C - ANSWER-E. A, B, and C
Tests for slump and air content must be started within ____________ after obtaining the final portion of
the composite sample. - ANSWER-5 min
The minimum size sample for making strength test specimens is _____. - ANSWER-1 ft^3 [28L]
For normal strength concretes, what temperature range must be maintained for test cylinders during
initial curing? - ANSWER-60 to 80 degrees F
T/F When the concrete contains large aggregate, the testing technician should wet screen the sample
before making density (unit weight) tests for use in yield computations. - ANSWER-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? - ANSWER-3in [75mm]
T/F The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold. -
ANSWER-False
T/F Unless specified otherwise, strength test specimens molded from concrete having a slump less than
1 in. [25mm] must be consolidated by vibration. - ANSWER-True
The end of the tamping rod should be __________________. - ANSWER-Hemispherical
Start molding strength test specimens within ________ after fabricating the composite sample. -
ANSWER-15 min
T/F Air content of fresh concrete using the volumetric meter specifies a minimum time requirement for
inverting and agitating the meter to free concrete rom the base. - ANSWER-True [45s]
, T/F It is acceptable to fabricate a test specimen from the same concrete used for the air content test. -
ANSWER-False
What is the correct equation or air content (in percent) using theoretical density and measured density?
Theoretical [T]
Actual [A] - ANSWER-[(T-A)/T]*100%
Collecting a representative sample of concrete to be tested is as important as executing the test methods
to obtain - ANSWER-accurate results
this practice covers sampling from four type of equipment, which are: - ANSWER-stationary mixer,
revolving drum, continuous, and paving
The elapsed time between obtaining the first and final portions of a composite sample shall not exceed -
ANSWER-15 min
T/F Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample -
ANSWER-True
Start tests for slump , temp, and air content within __________ after obtaining the final portion of the
composite sample. - ANSWER-5 min
Start molding specimens for strength tests within how many minutes after fabricating the composite
sample? - ANSWER-15 min
The concrete sample must be protected from contamination and _____. - ANSWER-evaporation
when sampling from a paving mixer, obtain samples from at least ____ different portions of the pile and
combine them into one composite sample for the test purpose. - ANSWER-5
when sampling from a revolving truck mixer, sample the concrete by collecting ______ or more portions
taken at regularly spaced intervals during discharge of the middle portion of the batch - ANSWER-2
correct DETAILED ANSWERS
T/F The method of determining air content of concrete containing lightweight aggregate is the pressure
method. - ANSWER-False
T/F When making a test cylinder from concrete being used in construction, the field technician must also
measure the slump of the concrete. - ANSWER-True
T/F When making a test cylinder from concrete, there is a decided falling away or shearing off of
concrete from one side of the sample. What should the technician do? - ANSWER-Disregard test and
retest anther portion of the sample
preparation of specimens for transport include:
A. Determination that at least 8hr has elapsed since finial set
B. Ensure specimens have not been demolded
C. Allowing the specimen to air dry for at least 4hr - ANSWER-A. Determination that at least 8hr has
elapsed since finial set
If the aggregate correction factor for a given source of fine and coarse aggregate is found to be 0.2% 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? - ANSWER-4.8%
Strength test specimens transported from the field to the testing laboratory must be:
A. Protected from jarring
B. Protected from moisture loss
C. Protected from freezing
,D. A and B only
E. A, B, and C - ANSWER-E. A, B, and C
Tests for slump and air content must be started within ____________ after obtaining the final portion of
the composite sample. - ANSWER-5 min
The minimum size sample for making strength test specimens is _____. - ANSWER-1 ft^3 [28L]
For normal strength concretes, what temperature range must be maintained for test cylinders during
initial curing? - ANSWER-60 to 80 degrees F
T/F When the concrete contains large aggregate, the testing technician should wet screen the sample
before making density (unit weight) tests for use in yield computations. - ANSWER-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? - ANSWER-3in [75mm]
T/F The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold. -
ANSWER-False
T/F Unless specified otherwise, strength test specimens molded from concrete having a slump less than
1 in. [25mm] must be consolidated by vibration. - ANSWER-True
The end of the tamping rod should be __________________. - ANSWER-Hemispherical
Start molding strength test specimens within ________ after fabricating the composite sample. -
ANSWER-15 min
T/F Air content of fresh concrete using the volumetric meter specifies a minimum time requirement for
inverting and agitating the meter to free concrete rom the base. - ANSWER-True [45s]
, T/F It is acceptable to fabricate a test specimen from the same concrete used for the air content test. -
ANSWER-False
What is the correct equation or air content (in percent) using theoretical density and measured density?
Theoretical [T]
Actual [A] - ANSWER-[(T-A)/T]*100%
Collecting a representative sample of concrete to be tested is as important as executing the test methods
to obtain - ANSWER-accurate results
this practice covers sampling from four type of equipment, which are: - ANSWER-stationary mixer,
revolving drum, continuous, and paving
The elapsed time between obtaining the first and final portions of a composite sample shall not exceed -
ANSWER-15 min
T/F Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample -
ANSWER-True
Start tests for slump , temp, and air content within __________ after obtaining the final portion of the
composite sample. - ANSWER-5 min
Start molding specimens for strength tests within how many minutes after fabricating the composite
sample? - ANSWER-15 min
The concrete sample must be protected from contamination and _____. - ANSWER-evaporation
when sampling from a paving mixer, obtain samples from at least ____ different portions of the pile and
combine them into one composite sample for the test purpose. - ANSWER-5
when sampling from a revolving truck mixer, sample the concrete by collecting ______ or more portions
taken at regularly spaced intervals during discharge of the middle portion of the batch - ANSWER-2
