WGU C173 EXAM 4 QUESTIONS WITH
DETAILED VERIFIED ANSWERS
The volumetric method of determining air content of concrete can be used on concrete
containing
what types of aggregate?
All types of aggregate
What are the requirements for the tamping rod used in this test method?
A round, smooth, straight steel, high-density polyethylene, or other plastic rod of
equal or greater abrasion resistance with a 16 mm [5⁄8 in.] ± 2 mm [1⁄16 in.]
diameter. The length of the tamping rod shall be at least 100 mm [4 in.] greater than
the depth of the measuring bowl in which rodding is being performed, but not
greater than 600 mm [24 in.] in overall length.
What are the requirements for the strike-off bar used in this test method?
Flat, straight steel bar at least 3 by 20 by 300 mm [1/8 by 3/4 by 12 in.] or a flat,
straight high-density polyethylene bar, or other plastic of equal or greater abrasion
resistance, at least 6 by 20 by 300 mm [1/4 by 3/4 by 12 in.].
What is the approximate volume of the measuring cup used to add water to the air meter,
in relation
to the volume of the air meter bowl?
1.00 ± 0.04%
What type of alcohol and concentration must be used in this test method?
Isopropyl, 70% by volume (65% by weight)
A mallet weighing ______ must be used to tap the sides of the bowl after rodding each
layer.
600 ± 200 g [1.25 ± 0.50 lb.]
DETAILED VERIFIED ANSWERS
The volumetric method of determining air content of concrete can be used on concrete
containing
what types of aggregate?
All types of aggregate
What are the requirements for the tamping rod used in this test method?
A round, smooth, straight steel, high-density polyethylene, or other plastic rod of
equal or greater abrasion resistance with a 16 mm [5⁄8 in.] ± 2 mm [1⁄16 in.]
diameter. The length of the tamping rod shall be at least 100 mm [4 in.] greater than
the depth of the measuring bowl in which rodding is being performed, but not
greater than 600 mm [24 in.] in overall length.
What are the requirements for the strike-off bar used in this test method?
Flat, straight steel bar at least 3 by 20 by 300 mm [1/8 by 3/4 by 12 in.] or a flat,
straight high-density polyethylene bar, or other plastic of equal or greater abrasion
resistance, at least 6 by 20 by 300 mm [1/4 by 3/4 by 12 in.].
What is the approximate volume of the measuring cup used to add water to the air meter,
in relation
to the volume of the air meter bowl?
1.00 ± 0.04%
What type of alcohol and concentration must be used in this test method?
Isopropyl, 70% by volume (65% by weight)
A mallet weighing ______ must be used to tap the sides of the bowl after rodding each
layer.
600 ± 200 g [1.25 ± 0.50 lb.]
