ACI Practice Test with Accurate
Solutions
Sampling Freshly Mixed Concrete:
The elapse time shall not exceed _____ minutes between obtaining the first and final
portions of the composite sample. - ANS-15
Sampling Freshly Mixed Concrete:
How many portions shall be taken from a revolving drum mixer for a sample of freshly
mixed concrete? - ANS-2 or more
sampling freshly mixed concrete:
When sampling from a pile that has been discharged from a paving mixer, obtain
samples from at least ___different portions of the pile. - ANS-5
sampling freshly mixed concrete:
When using a 12-inch slump cone, the length of the tamping rod shall be _______ ± ⅛
inches. - ANS-16 to 24
Slump:
Raise the mold a distance of 12 inches in _____. - ANS-5 +/- 2 seconds
Slump:
Complete the entire test from the start of the filling through removal of the mold without
interruption and within an elapsed time of _______. - ANS-2.5 min
Slump:
T/F: The slump cone should be dampened before starting the test. - ANS-T
Slump:
Measure the slump of the concrete to the nearest ____ inches. - ANS-0.25
, Slump:
Slump is measured from ___________________________. - ANS-the original center to
the displaced center of the top surface.
Slump:
The slump measuring device must be __________________. - ANS-marked in at least
0.25" increments and rigid or semirigid
Slump:
In filling and rodding the top layer, __________________________. - ANS-heap the
concrete above the mold before rodding.
Yield and Unit Weight:
When performing the weight per cubic foot procedure, ________________. - ANS--after
each layer is rodded, tap the sides of the measure smartly 10 to 15 times
-strokes are distributed uniformly over the cross section
-the layers are rodded 25 strokes per layer (when using ½ ft.³ or less container)
Yield and Unit Weight:
Given the following data, the calculation for unit weight of concrete is _______.
weight of ½ ft.3 bucket = 11.0 lb.
weight of bucket and concrete = 86.0 lb.
volume of bucket = 0.488 ft.3
air content = 6%
slump = 3 ½" - ANS-153.7 lbs/ft.³
Yield and Unit Weight:
If the unit weight test of concrete was 147 lb/ft3 and the total batch weight for one
cubicyard was 3986 lb, the yield would be _________. - ANS-27.1 ft.³
Yield and Unit Weight:
What is the yield of a batch in cubic feet per cubic yard if the unit weight test result is
144 lb/ft.3 and the batched weights for 4 yd3 are:
cement- 2250 lb
sand- 5131 lb
stone- 7440 lb
water- 1000 lb - ANS-27.5 ft.³
Yield and Unit Weight:
Solutions
Sampling Freshly Mixed Concrete:
The elapse time shall not exceed _____ minutes between obtaining the first and final
portions of the composite sample. - ANS-15
Sampling Freshly Mixed Concrete:
How many portions shall be taken from a revolving drum mixer for a sample of freshly
mixed concrete? - ANS-2 or more
sampling freshly mixed concrete:
When sampling from a pile that has been discharged from a paving mixer, obtain
samples from at least ___different portions of the pile. - ANS-5
sampling freshly mixed concrete:
When using a 12-inch slump cone, the length of the tamping rod shall be _______ ± ⅛
inches. - ANS-16 to 24
Slump:
Raise the mold a distance of 12 inches in _____. - ANS-5 +/- 2 seconds
Slump:
Complete the entire test from the start of the filling through removal of the mold without
interruption and within an elapsed time of _______. - ANS-2.5 min
Slump:
T/F: The slump cone should be dampened before starting the test. - ANS-T
Slump:
Measure the slump of the concrete to the nearest ____ inches. - ANS-0.25
, Slump:
Slump is measured from ___________________________. - ANS-the original center to
the displaced center of the top surface.
Slump:
The slump measuring device must be __________________. - ANS-marked in at least
0.25" increments and rigid or semirigid
Slump:
In filling and rodding the top layer, __________________________. - ANS-heap the
concrete above the mold before rodding.
Yield and Unit Weight:
When performing the weight per cubic foot procedure, ________________. - ANS--after
each layer is rodded, tap the sides of the measure smartly 10 to 15 times
-strokes are distributed uniformly over the cross section
-the layers are rodded 25 strokes per layer (when using ½ ft.³ or less container)
Yield and Unit Weight:
Given the following data, the calculation for unit weight of concrete is _______.
weight of ½ ft.3 bucket = 11.0 lb.
weight of bucket and concrete = 86.0 lb.
volume of bucket = 0.488 ft.3
air content = 6%
slump = 3 ½" - ANS-153.7 lbs/ft.³
Yield and Unit Weight:
If the unit weight test of concrete was 147 lb/ft3 and the total batch weight for one
cubicyard was 3986 lb, the yield would be _________. - ANS-27.1 ft.³
Yield and Unit Weight:
What is the yield of a batch in cubic feet per cubic yard if the unit weight test result is
144 lb/ft.3 and the batched weights for 4 yd3 are:
cement- 2250 lb
sand- 5131 lb
stone- 7440 lb
water- 1000 lb - ANS-27.5 ft.³
Yield and Unit Weight:
