Section 6

Question 1

the volumetric method of deterring air content of concrete can be used on concrete containing what types of aggregate?

Answer 1

all types of aggregate

Question 2

what are the requirements for the tamping rod used in this test method

Answer 2

steel or plastic with a hemispherical tip on one or both ends, at least 4 inch taller than the height of the measure but not more than 24”

Question 3

What are the requirements for the strike off bar in this method? volumetric method

Answer 3

medal or plastic, flat bar at least 3/4” width and 12” in length. If using a meter made of medal the thickness must be at least 1/8 inch and if using a meter made of plastic the thickness must be at least 1/4”

Question 4

What is the approximate capacity of the measuring cup used to add water to the air meter?

Answer 4

1 quart

Question 5

what type of alcohol and concentration must be used in this test method?

Answer 5

Isopropyl, 70% by volume

Question 6

a mallet weighting _____ must be used to tap the sides of the bowl after rodding each layer

Answer 6

1.25 plus or minus .5 lbs

Question 7

this test must be performed on concrete containing materials that pass the

Answer 7

1 inch sieve

Question 8

when filling the measuring bowl of the air meter the concrete must be placed in ___ layers of equal volume

Answer 8

two

Question 9

what is the number of strokes to rod each layer in the volumetric test?

Answer 9

25

Question 10

true or false It is necessary to tap the sides of the measuring bowl after each layer has been rodded in a volumetric test

Answer 10

true

Question 11

true or false: the initial quantity of water and alcohol added tot he air meter can be poured directly into the neck of the top section of the air meter in a volumetric test

Answer 11

false- need to add funnel

Question 12

upon final filing of air meter with water, what part of the liquid level should be adjusted to the zero mark on the meter in a volumetric test?

Answer 12

bottom of the meniscus

Question 13

how long should the air meter be inverted and agitated

Answer 13

5 seconds at a time for a total of 45 seconds

Question 14

How many times does the rolling operation occur in a volumetric test?

Answer 14

minimum of 2 max of 3

Question 15

Why is alcohol added to the volumetric test?

Answer 15

to dispel any foam

Question 16

the direct reading of the final liquid level in the neck of the air meter is estimated to the nearest

Answer 16

.25%

Question 17

If the air content is greater than the 9% range of the meter

Answer 17

calibrated cups of water are added to bring the liquid level within the graduated range

Question 18

in order for the initial meter reading to be valid the meter must not be leaking, the liquid level must stabilize within 6 min, and the foam on the surface must not be greater than how many percentages?

Answer 18

2%

Question 19

true of false: If less than 2.5 pints of alcohol are used, the air content is always indicated by the final meter reading.

Answer 19

false reading is what you read in neck +calubrated cups added minus correction factors

Question 20

If more than 2.5 pints of alcohol are used the final meter reaching is always adjusted using

Answer 20

a correction factor

Question 21

at the end of the procedure the air meter is

Answer 21

disassembled and its contents examined

Question 22

If portions of undisturbed concrete are found in the air meter at the end of the volumetric test,

Answer 22

the test is invalid