Astm C173/c173M Air Content Of Freshly Mixed Concrete By The Volumetric Method

Front 1

The volumetric method of determining air content of concrete can be used on concrete containing what types of aggregate?

Back 1

light weight aggregates, air cooled slag, highly porus aggregates

Front 2

What are the requirements for the tamping rod used in this test method?

Back 2

5/8 +- 1/16'' Tamping Rod must be +4'' greater bowl but not more than 24''

Front 3

What are the requirements for the strike-off bar used in this test method

Back 3

1/8 by 3/4 by 12 in. abrasion resistant plastic / high density polyethelene

Front 4

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?

Back 4

1% +- .04%

Front 5

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

Back 5

Isopropyl Alcohol / 70%

Front 6

A mallet weighing _____ must be used to tap the sides of the bowl after rodding each layer.

Back 6

1.25 +- .5lb or 600 +- 200G

Front 7

The maximum size aggregate allowed in this test method is ____

Back 7

1 1/2''

Front 8

If the concrete sample contains aggregate larger than that allowed for this test, the sample must be

Back 8

wet sieved

Front 9

When filling the measuring bowl of the air meter, the concrete must be placed in ____ layers of equal depth

Back 9

2

Front 10

What is the specified number of strokes required when rodding each layer of concrete?

Back 10

25

Front 11

Is it necessary to tap the sides of the measuring bowl after each layer has been rodded. T or F

Back 11

True

Front 12

The initial quantity of water and alcohol added to the air meter can be poured directly into the neck of the top section of the air meter. T or F

Back 12

False

Front 13

The sample of concrete used in this test method must be obtained in accordance with what ASTM Standard?

Back 13

ASTM 172

Front 14

Upon final filling of the air meter with water, what part of the liquid level should be adjusted to the zero mark on the meter?

Back 14

Bottom of the meniscus

Front 15

How long should the air meter be inverted and agitated?

Back 15

5s intervals for 45seconds

Front 16

How many times does the rolling operating occur?

Back 16

3 1 minute each

Front 17

Why is the isopropyl alcohol added to the meter?

Back 17

control amount of foam

Front 18

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

Back 18

.25%

Front 19

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

Back 19

h20

Front 20

In order for an initial meter reading to be valid, the meter must not be leaking, the liquid level must be stabilize within 6 minutes and the foam on the surface of the liquid must not be greater than 2 full percent divisions. T or F

Back 20

True

Front 21

If less than 1.25 L [2.5pt] of alcohol are used, the air content is always indicated by the final meter reading. T or F

Back 21

F

Front 22

If more than 1.25L [2.5pt] of alcohol are used, the final meter reading is always adjusted using

Back 22

alcohol correction factors

Front 23

When large amount of alcohol are used, the direct reading will tend to indicate a _______ air content

Back 23

higher

Front 24

At the end of the procedure, the air meter is

Back 24

disassemble / inspect content

Front 25

If portions of undistrubed concrete are found in the air meter at the end of the test

Back 25

the test isn't valid

Front 26

How much water should you add?

Back 26

at least 0.5L [1pt]