ACI CONCRETE BUNDLED EXAMS
UPDATED ACTUAL QUESTIONS AND
COMPLETE SOLUTIONS GRADED A+
⩥ What is the specified weight of the mallet used on measures that are
0.5 ft3 [14 L] or smaller?.
Answer: 1.25 ± 0.50 lb. [600 ± 200 g]
⩥ Measures other than air meter bowls used for this test must conform
to ASTM _____..
Answer: C29
⩥ Air meter bowls used for this test must conform to ASTM _____ and
be calibrated for volume according
to ASTM _____..
Answer: C231, C29
⩥ The concrete sample must be obtained in accordance with what
ASTM method?.
Answer: C172
⩥ What method of consolidation must be used when the slump is greater
than 3 in. [75 mm]?.
,Answer: Rodding
⩥ What method of consolidation must be used when the slump is less
than 1 in. [25 mm]?.
Answer: Vibration
⩥ If rodding is the method of consolidation being used, the measure
must be filled in how many layers?.
Answer: 3
⩥ For a measure of 0.5 ft3 [14 L], what is the required number of
strokes of the tamping rod for consolidation
of each layer?.
Answer: 25
⩥ When rodding the middle and the top layers, the tamping rod should
penetrate into the layer below approximately _____..
Answer: 1 in. [25 mm]
⩥ If vibration is the method of consolidation, the measure must be filled
in _____ approximately equal layers..
Answer: 2
, ⩥ If, after consolidation of the final layer, the concrete level is 1/2 in.
(13 mm) above the top of the measure, what should be done?.
Answer: Remove a representative portion of the excess concrete with a
trowel or scoop
⩥ After consolidation of the final layer, an excess of concrete _____
above the top of the measure is considered optimum..
Answer: ⅛ in. [3 mm]
⩥ After completing the strike-off procedure, what must be done before
weighing the measure and sample?.
Answer: Clean off any excess concrete
⩥ Density (Unit Weight) Calculation
Known: Volume of measure = 0.504 ft3 [14.27 L or 0.01427 m3]
Mass of empty measure = 19.6 lb [8.89 kg]
The procedures of Method C138 are followed, and the mass of the
measure plus the concrete is found to be 92.1 lb [41.78 kg]. Calculate
the density of the concrete in lb/ft3 [kg/m3]..
Answer: 143.9 lb/ft3 [2305 kg/m3]
⩥ Yield Calculations
UPDATED ACTUAL QUESTIONS AND
COMPLETE SOLUTIONS GRADED A+
⩥ What is the specified weight of the mallet used on measures that are
0.5 ft3 [14 L] or smaller?.
Answer: 1.25 ± 0.50 lb. [600 ± 200 g]
⩥ Measures other than air meter bowls used for this test must conform
to ASTM _____..
Answer: C29
⩥ Air meter bowls used for this test must conform to ASTM _____ and
be calibrated for volume according
to ASTM _____..
Answer: C231, C29
⩥ The concrete sample must be obtained in accordance with what
ASTM method?.
Answer: C172
⩥ What method of consolidation must be used when the slump is greater
than 3 in. [75 mm]?.
,Answer: Rodding
⩥ What method of consolidation must be used when the slump is less
than 1 in. [25 mm]?.
Answer: Vibration
⩥ If rodding is the method of consolidation being used, the measure
must be filled in how many layers?.
Answer: 3
⩥ For a measure of 0.5 ft3 [14 L], what is the required number of
strokes of the tamping rod for consolidation
of each layer?.
Answer: 25
⩥ When rodding the middle and the top layers, the tamping rod should
penetrate into the layer below approximately _____..
Answer: 1 in. [25 mm]
⩥ If vibration is the method of consolidation, the measure must be filled
in _____ approximately equal layers..
Answer: 2
, ⩥ If, after consolidation of the final layer, the concrete level is 1/2 in.
(13 mm) above the top of the measure, what should be done?.
Answer: Remove a representative portion of the excess concrete with a
trowel or scoop
⩥ After consolidation of the final layer, an excess of concrete _____
above the top of the measure is considered optimum..
Answer: ⅛ in. [3 mm]
⩥ After completing the strike-off procedure, what must be done before
weighing the measure and sample?.
Answer: Clean off any excess concrete
⩥ Density (Unit Weight) Calculation
Known: Volume of measure = 0.504 ft3 [14.27 L or 0.01427 m3]
Mass of empty measure = 19.6 lb [8.89 kg]
The procedures of Method C138 are followed, and the mass of the
measure plus the concrete is found to be 92.1 lb [41.78 kg]. Calculate
the density of the concrete in lb/ft3 [kg/m3]..
Answer: 143.9 lb/ft3 [2305 kg/m3]
⩥ Yield Calculations
