ACI Test Questions with Verified
Solutions
False - ANSWER-According to test method c1064 composite sample are required even
if the only purpose for obtaining the sample is to determine temperature. True or False?
Do not remove the temperature measuring device from the concrete when reading the
temperature. - ANSWER-ASTM C1064, What one of the following statement is true?
2 min - ANSWER-ASTM C1064, Leave the temperature measuring device in the freshly
mixed concrete for at least:
0.5C(1 F) - ANSWER-ASTM C1064, The measured temperature of the freshly mixed
concrete must be reported to the nearest:
5 min - ANSWER-ASTM C1064, Leave the temperature measuring device in the freshly
mixed concrete for not more than:
15 min - ANSWER-ASTM C172, start molding specimens for strength test within
______ when fabricating the composite sample:
28 L(1 ft) - ANSWER-According to practice C172 the minimum size of the sample to be
used for strength test is:
Remixed with a shovel prior to testing. - ANSWER-ASTM C172, Some test procedure
require that concrete be sieve prior to testing after removed the large aggregate particle
the batch is:
From five different portions of the pile after the concrete has been discharged. -
ANSWER-When the sampling from a paving mixer, Practice C172 permits the
composite sample to be obtained:
15 min - ANSWER-ASTM C172, The elapsed time between obtaining the first and final
portion of the composite sample shall not exceed:
5 min - ANSWER-ASTM C172, The tests for slump or air content, or both, must be
started within ______ after obtaining the final portion of the composite sample.
Passing a receptacle completely through the discharge stream. - ANSWER-ASTM
C172, When sampling from a stationary mixer, except for a paving mixer, the technician
can ensure a representative sample by:
, Adjusting the rate of the revolution of the drum. - ANSWER-ASTM C172, To obtain a
representative sample from a revolving drum truck mixer, regulate the rate of discharge
by:
Disregard the test and make a new test on another portion of the sample. - ANSWER-
ASTM C143, If a decided falling away or shearing off of concrete from one side or
portion of the mass occurs after lifting the slump test mold:
Removal of aggregate over 1-1/2 in. (37.5mm) in accordance with practice C172. -
ANSWER-ASTM C143, When performing a slump test, a concrete sample with 2 in.
maximum size aggregate requires which one of the following?
Approximately equal volume - ANSWER-ASTM C143, the slump mold is filled in three
layers of:
2-1/2 min - ANSWER-ASTM C143, Complete the entire test from the start of the filling
through removal of the mold without interruption and complete it within an elapsed time
of:
The displaced original center of the top surface of the specimen - ANSWER-ASTM
C143, The slump is measured as the vertical difference between the top of the mold
and:
Add additional concrete to keep an excess of concrete above the top of the mold -
ANSWER-ASTM C143, IN filling and rodding the top later, if the rodding results in
subsidence of concrete below the top edge of the mold:
A screeding and rolling motion of the tamping rod - ANSWER-ASTM C143, After the top
layer has been rodded, the surface of the concrete is struck off by means of:
1/4 in (5mm) - ANSWER-ASTM C143, The measuring device used to measure the
slump must be marked in increments of ______ or smaller.
Flat strike-off plate - ANSWER-ASTM C138, The top of the concrete in a measure used
in Test Method C138 is struck off with a:
Rodding - ANSWER-ASTM C138, When 90 mm(3-1/2 in) slump concrete is
consolidated in a 14 L(0.5 ft) measure, consolidation is accomplished by:
5.5= (145-137)/145 x 100 - ANSWER-ASTM C138, What is the air content ( in percent)
of the following concrete batch?
Nominal maximum size of coarse aggregate in the concrete - ANSWER-ASTM C138,
The minimum capacity of the measure used for density tests is based upon the:
Solutions
False - ANSWER-According to test method c1064 composite sample are required even
if the only purpose for obtaining the sample is to determine temperature. True or False?
Do not remove the temperature measuring device from the concrete when reading the
temperature. - ANSWER-ASTM C1064, What one of the following statement is true?
2 min - ANSWER-ASTM C1064, Leave the temperature measuring device in the freshly
mixed concrete for at least:
0.5C(1 F) - ANSWER-ASTM C1064, The measured temperature of the freshly mixed
concrete must be reported to the nearest:
5 min - ANSWER-ASTM C1064, Leave the temperature measuring device in the freshly
mixed concrete for not more than:
15 min - ANSWER-ASTM C172, start molding specimens for strength test within
______ when fabricating the composite sample:
28 L(1 ft) - ANSWER-According to practice C172 the minimum size of the sample to be
used for strength test is:
Remixed with a shovel prior to testing. - ANSWER-ASTM C172, Some test procedure
require that concrete be sieve prior to testing after removed the large aggregate particle
the batch is:
From five different portions of the pile after the concrete has been discharged. -
ANSWER-When the sampling from a paving mixer, Practice C172 permits the
composite sample to be obtained:
15 min - ANSWER-ASTM C172, The elapsed time between obtaining the first and final
portion of the composite sample shall not exceed:
5 min - ANSWER-ASTM C172, The tests for slump or air content, or both, must be
started within ______ after obtaining the final portion of the composite sample.
Passing a receptacle completely through the discharge stream. - ANSWER-ASTM
C172, When sampling from a stationary mixer, except for a paving mixer, the technician
can ensure a representative sample by:
, Adjusting the rate of the revolution of the drum. - ANSWER-ASTM C172, To obtain a
representative sample from a revolving drum truck mixer, regulate the rate of discharge
by:
Disregard the test and make a new test on another portion of the sample. - ANSWER-
ASTM C143, If a decided falling away or shearing off of concrete from one side or
portion of the mass occurs after lifting the slump test mold:
Removal of aggregate over 1-1/2 in. (37.5mm) in accordance with practice C172. -
ANSWER-ASTM C143, When performing a slump test, a concrete sample with 2 in.
maximum size aggregate requires which one of the following?
Approximately equal volume - ANSWER-ASTM C143, the slump mold is filled in three
layers of:
2-1/2 min - ANSWER-ASTM C143, Complete the entire test from the start of the filling
through removal of the mold without interruption and complete it within an elapsed time
of:
The displaced original center of the top surface of the specimen - ANSWER-ASTM
C143, The slump is measured as the vertical difference between the top of the mold
and:
Add additional concrete to keep an excess of concrete above the top of the mold -
ANSWER-ASTM C143, IN filling and rodding the top later, if the rodding results in
subsidence of concrete below the top edge of the mold:
A screeding and rolling motion of the tamping rod - ANSWER-ASTM C143, After the top
layer has been rodded, the surface of the concrete is struck off by means of:
1/4 in (5mm) - ANSWER-ASTM C143, The measuring device used to measure the
slump must be marked in increments of ______ or smaller.
Flat strike-off plate - ANSWER-ASTM C138, The top of the concrete in a measure used
in Test Method C138 is struck off with a:
Rodding - ANSWER-ASTM C138, When 90 mm(3-1/2 in) slump concrete is
consolidated in a 14 L(0.5 ft) measure, consolidation is accomplished by:
5.5= (145-137)/145 x 100 - ANSWER-ASTM C138, What is the air content ( in percent)
of the following concrete batch?
Nominal maximum size of coarse aggregate in the concrete - ANSWER-ASTM C138,
The minimum capacity of the measure used for density tests is based upon the:
