ACI Density (Unit Weight) and Yield of Fresh
Concrete correctly answers graded A+ 2025
1. The length of the tamping rod used in this test method at least 4 in
taller than
is the measure, but no more
th_a.n 24 in.
2. What is the required shape of the tamping round hemispherical
end of the rod?
3. What is the required minimum frequency of the vibra- 9000
vibrations per min
tor used in this test method? (150 Hz)
4. The outside diameter or side dimension 0.75of in 1.50 in
the vibrat- ing element must be at least but
not greater than .
5. What material is the measure made of? metal
6. What is the minimum thickness of a metal 1/4 in
strike-off plate?
7. What is the minimum thickness for a glass or 1/2 in
acrylic strike-off plate?
8. What is the specified weight of the mallet 1-1/4 lb +-1/2
used on measures that are 1/2 ft^3 or
smaller?
9. What method of consolidation must be used when the rodding
slump is greater than 3 in. (25 mm]?
10. What method of consolidation must be used when the vibration
slump is less than 1 in. (25 mm]?
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4
Concrete correctly answers graded A+ 2025
1. The length of the tamping rod used in this test method at least 4 in
taller than
is the measure, but no more
th_a.n 24 in.
2. What is the required shape of the tamping round hemispherical
end of the rod?
3. What is the required minimum frequency of the vibra- 9000
vibrations per min
tor used in this test method? (150 Hz)
4. The outside diameter or side dimension 0.75of in 1.50 in
the vibrat- ing element must be at least but
not greater than .
5. What material is the measure made of? metal
6. What is the minimum thickness of a metal 1/4 in
strike-off plate?
7. What is the minimum thickness for a glass or 1/2 in
acrylic strike-off plate?
8. What is the specified weight of the mallet 1-1/4 lb +-1/2
used on measures that are 1/2 ft^3 or
smaller?
9. What method of consolidation must be used when the rodding
slump is greater than 3 in. (25 mm]?
10. What method of consolidation must be used when the vibration
slump is less than 1 in. (25 mm]?
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4
