ACI GRADE 1 TESTING WITH
COMPLETE SOLUTIONS
For concrete with aggregates less than 3 inches, the thermometer must remain in the
fresh concrete sample a. Minimum of 5 minutes or until temperature reading stabilizes.
(True or false) - ANSWER-False( 2 minutes but not more than 5)
The temperature measuring device must be accurate to within 0.1° ( true or false) -
ANSWER-False 1°F or 0.5°C
The temperature measuring device shall have a capacity of measuring temperature of
freshly mixed concrete throughout a range of ____ to ___F - ANSWER-30° to 120°F
A composite sample is not needed if only the temperature test is being run( T or F) -
ANSWER-True
The temperature of fresh concrete in a placement must be measured by inserting a
thermometer into the top six inches of concrete.( T or F) - ANSWER-False (does not
specify aggregate size)
ASTM C1064 states the container used to measure temperature of concrete must be
large enough to provide at least 5 inches of concrete. ( T or F) - ANSWER-False ( 3
inches or must be 3x the nominal max size)
The temperature of the concrete is recorded to the nearest __°F - ANSWER-1°F
Calibrate the temperature measuring device at least ___, or whenever there is a
question of accuracy - ANSWER-Annually
After the thermometer is placed in the concrete: - ANSWER-Gently press concrete
around the thermometer.
According to ASTM C1064, what is one reason to take the temperature of concrete? -
ANSWER-Verify conformance
The slump cone should be raised carefully, vertically upward, in a steady motion in
_____ seconds - ANSWER-3-7
The elapsed time between the start of filling the slump cone and the removal of the
cone must be more than: - ANSWER-2.5 minutes
, The slump should be measured to the nearest - ANSWER-quarter of an inch
In order to determine slump, you should measure the vertical distaance from -
ANSWER-The top of the mold to the displaced original center of the top surface.
The dimensions of the slump cone - ANSWER-Top diameter 4 inches, bottom diameter
8 inches, height 12 inches
In the slump test, if a decided falling away or shearing off the concrete from one side or
portion of the mass occurs upon raising the slump cone, one should - ANSWER-
Disregard the test and make a new test on another portion of the sample
The slump coke should be struck-off with: - ANSWER-The tamping rod
The slump cone must be placed: - ANSWER-On a flat moist, non-absorbent, rigid
surface
When rodding a second or third layer, the rod must penetrate the preceding layer by
about 1 inch (t or f) - ANSWER-True
The normal half cubic foot bucket may not be used to determine density(unit weight) of
lightweight concrete (t or f) - ANSWER-False
Concrete slump of less than 1 inch must be consolidated using a vibrator(t or f) -
ANSWER-True
According to ASTM C138, after rodding each layer, tap the sides of the container, with
the rod exactly 25 times. (T or F) - ANSWER-False
ASTM C138 states, "the minimum capacity of the bucket depends on the maximum
slump requirement." (T or F) - ANSWER-False
The outside of the density bucket should be cleaned before weighing. (T or F) -
ANSWER-True
Concrete with a slump Less than 1 inch should be riffed 25 times per layer (t or f) -
ANSWER-False ( using vibration)
According to C138, concretes with slumps of 1-3 inches may be compacted with the
vibrator or the rod. (T or F) - ANSWER-True
The unit weight bucket must be calibrated at least once a month. (T or F) - ANSWER-
False (often)
COMPLETE SOLUTIONS
For concrete with aggregates less than 3 inches, the thermometer must remain in the
fresh concrete sample a. Minimum of 5 minutes or until temperature reading stabilizes.
(True or false) - ANSWER-False( 2 minutes but not more than 5)
The temperature measuring device must be accurate to within 0.1° ( true or false) -
ANSWER-False 1°F or 0.5°C
The temperature measuring device shall have a capacity of measuring temperature of
freshly mixed concrete throughout a range of ____ to ___F - ANSWER-30° to 120°F
A composite sample is not needed if only the temperature test is being run( T or F) -
ANSWER-True
The temperature of fresh concrete in a placement must be measured by inserting a
thermometer into the top six inches of concrete.( T or F) - ANSWER-False (does not
specify aggregate size)
ASTM C1064 states the container used to measure temperature of concrete must be
large enough to provide at least 5 inches of concrete. ( T or F) - ANSWER-False ( 3
inches or must be 3x the nominal max size)
The temperature of the concrete is recorded to the nearest __°F - ANSWER-1°F
Calibrate the temperature measuring device at least ___, or whenever there is a
question of accuracy - ANSWER-Annually
After the thermometer is placed in the concrete: - ANSWER-Gently press concrete
around the thermometer.
According to ASTM C1064, what is one reason to take the temperature of concrete? -
ANSWER-Verify conformance
The slump cone should be raised carefully, vertically upward, in a steady motion in
_____ seconds - ANSWER-3-7
The elapsed time between the start of filling the slump cone and the removal of the
cone must be more than: - ANSWER-2.5 minutes
, The slump should be measured to the nearest - ANSWER-quarter of an inch
In order to determine slump, you should measure the vertical distaance from -
ANSWER-The top of the mold to the displaced original center of the top surface.
The dimensions of the slump cone - ANSWER-Top diameter 4 inches, bottom diameter
8 inches, height 12 inches
In the slump test, if a decided falling away or shearing off the concrete from one side or
portion of the mass occurs upon raising the slump cone, one should - ANSWER-
Disregard the test and make a new test on another portion of the sample
The slump coke should be struck-off with: - ANSWER-The tamping rod
The slump cone must be placed: - ANSWER-On a flat moist, non-absorbent, rigid
surface
When rodding a second or third layer, the rod must penetrate the preceding layer by
about 1 inch (t or f) - ANSWER-True
The normal half cubic foot bucket may not be used to determine density(unit weight) of
lightweight concrete (t or f) - ANSWER-False
Concrete slump of less than 1 inch must be consolidated using a vibrator(t or f) -
ANSWER-True
According to ASTM C138, after rodding each layer, tap the sides of the container, with
the rod exactly 25 times. (T or F) - ANSWER-False
ASTM C138 states, "the minimum capacity of the bucket depends on the maximum
slump requirement." (T or F) - ANSWER-False
The outside of the density bucket should be cleaned before weighing. (T or F) -
ANSWER-True
Concrete with a slump Less than 1 inch should be riffed 25 times per layer (t or f) -
ANSWER-False ( using vibration)
According to C138, concretes with slumps of 1-3 inches may be compacted with the
vibrator or the rod. (T or F) - ANSWER-True
The unit weight bucket must be calibrated at least once a month. (T or F) - ANSWER-
False (often)
