ACI CONCRETE FIELD TESTING
TECHNICIAN- GRADE I QUESTIONS WITH
CORRECT VERIFIED ANSWERS
How much time is allowed for lifting the slump mold?
5 +- 2 seconds
The measurement for slump is made from the top of the mold
to what point of the concrete specimen?
The displaced original center of the top surface of the
specimen
The slump of the concrete is measured and reported to the
nearest .
1/4 in. [5 mm]
How much time is allowed to conduct the slump test from
beginning to completion?
2 1/2 minutes
,The diameter of the tamping rod used in the test method is
.
5/8 in. [16 mm]
What is the required shape of the tamping end of the rod?
Rounded to a hemispherical tip
What is the required minimum frequency of the vibrator used
in this test method?
7000 vibrations per minute
The outside diameter or side dimension of the vibrating
element must be at least but not greater than .
0.75 in. [19 mm], 1.50 in. [38 mm]
A plastic container can be used for the measure in this
method. True or False?
False, measure must be steel or another suitable metal
,What is the minimum thickness of a metal strike-off plate?
1/4 in. [6 mm]
What is the minimum thickness for a glass or acrylic strike-off
plate?
1/2 in. [12 mm]
What is the specified weight of the mallet used on measures
that are 0.5 ft^3 [14 L] or smaller?
1.25 +- 0.50 lb. [600 +- 200 g]
Measures other than air meter bowls used for this test must
conform to ASTM .
C29
Air meter bowls used for this test must conform to ASTM
and be calibrated for volumee according to ASTM
.
, C231, C29
The concrete sample must be obtained in accordance with
what ASTM method?
C172
What method of consolidation must be used when the slump
is greater than 3 in. [75 mm]?
Rodding
What method of consolidation must be used when the slump
is less than 1 in. (25 mm]?
Vibration
If rodding is the method of consolidation being used, the
measure must be filled in how many layers?
3
TECHNICIAN- GRADE I QUESTIONS WITH
CORRECT VERIFIED ANSWERS
How much time is allowed for lifting the slump mold?
5 +- 2 seconds
The measurement for slump is made from the top of the mold
to what point of the concrete specimen?
The displaced original center of the top surface of the
specimen
The slump of the concrete is measured and reported to the
nearest .
1/4 in. [5 mm]
How much time is allowed to conduct the slump test from
beginning to completion?
2 1/2 minutes
,The diameter of the tamping rod used in the test method is
.
5/8 in. [16 mm]
What is the required shape of the tamping end of the rod?
Rounded to a hemispherical tip
What is the required minimum frequency of the vibrator used
in this test method?
7000 vibrations per minute
The outside diameter or side dimension of the vibrating
element must be at least but not greater than .
0.75 in. [19 mm], 1.50 in. [38 mm]
A plastic container can be used for the measure in this
method. True or False?
False, measure must be steel or another suitable metal
,What is the minimum thickness of a metal strike-off plate?
1/4 in. [6 mm]
What is the minimum thickness for a glass or acrylic strike-off
plate?
1/2 in. [12 mm]
What is the specified weight of the mallet used on measures
that are 0.5 ft^3 [14 L] or smaller?
1.25 +- 0.50 lb. [600 +- 200 g]
Measures other than air meter bowls used for this test must
conform to ASTM .
C29
Air meter bowls used for this test must conform to ASTM
and be calibrated for volumee according to ASTM
.
, C231, C29
The concrete sample must be obtained in accordance with
what ASTM method?
C172
What method of consolidation must be used when the slump
is greater than 3 in. [75 mm]?
Rodding
What method of consolidation must be used when the slump
is less than 1 in. (25 mm]?
Vibration
If rodding is the method of consolidation being used, the
measure must be filled in how many layers?
3
