Section 5

Question 1

The pressure method of determining air content can be used on concrete containing ______ and _______ aggregate

Answer 1

normal weight, heavy weight

Question 2

The pressure method of determining air content cannot bemused on concrete containing the following:

Answer 2

lightweight aggregate, aggregate of high porosity

Question 3

what is the specified size of the malet required fora typical air meter

Answer 3

1.25 lbs plus or minus 1/2 lbs

Question 4

Wet screening may be necessary when the mixture contains aggregate with a nominal max size greater than

Answer 4

1.5 inches

Question 5

If the concrete sample is to be consolidated by rodding the measure is filled in _____ layers

Answer 5

three equal

Question 6

If the concrete sample is to be consolidated by vibration, the measure is filled in _____

Answer 6

2 equal layers

Question 7

when rodding the concrete sample what is the specified number of strokes per layer

Answer 7

25

Question 8

Vibration of the concrete sample is not allowed when the slump of the concrete exceeds

Answer 8

3 inches

Question 9

In rodding the sample how deep should you penetrate each layer?

Answer 9

full current layer and 1 inch into layer below

Question 10

after rodding each layer what should be done to the measure before adding another layer of concrete

Answer 10

tap the sides of the measure 10 to 15 times with the mallet

Question 11

What tools may be used to strike off the top surface of the concrete following consolidation of the final layer?

Answer 11

a strike off bar or plate