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Concrete Field Technician - G1 > Section 5 and 6: Air Content > Flashcards

Section 5 and 6: Air Content Flashcards

1
Q

Where does the Correction Factor come from with Air Content?

A

Based on air inside the aggregate.

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2
Q

How often should an Air Meter be calibrated?

A

Within 3 months

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3
Q

How accurately do you report air content?

A

0.1%

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4
Q

Pressure Method Air Meter Test is only applicable to concrete with what type of aggregates?

A

Normal Weight and Heavy Weight

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5
Q

Pressure Method Air Meter Test is only applicable to what type of concrete?

A

Plastic

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6
Q

Pressure Method Air Meter Test is not applicable to what type of aggregates?

A

Lightweight and High Porosity

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7
Q

What is the size of the mallet for an Air Meter Test?

A

1-1/4 +/- 1/2 lb

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8
Q

Volume Method Air Meter Test can be used for what kind of aggregate?

A

All types of aggregate

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9
Q

What is the approximate capacity of the measuring cup to add water to the Volume Method Air Meter Test?

A

1-quart

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10
Q

What type of alcohol and concentration is used in the Volume Method Air Meter Test?

A

Isopropyl, 70% by Volume

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11
Q

When filling the measuring bowl of the air meter in the Volumetric method how many layers?

A

Two

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12
Q

How do you add water during the Volumetric Air Meter Test?

A

with a funnel

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13
Q

How long should the air meter be inverted and agitated during the volumetric air meter test?

A

No more than 5 seconds at a time, but must be repeated for a minimum of 45 seconds to free concrete from the base

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14
Q

How many times does the rolling operation occur during the volumetric air meter test?

A

2 to 3

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15
Q

Why is the isopropyl alcohol added to the volumetric air meter test?

A

To dispel foam

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16
Q

What is the liquid level read to during the volumetric air meter test?

A

0.25%

17
Q

What is required for a valid volumetric air meter test?

A
  • The meter must not be leaking
  • The liquid level must stabilize within 6 minutes
  • The foam on the surface must not be greater than 2 full percent divisions
18
Q

If more than 2.5 pts of alcohol are used, the final meter reading during a volumetric air meter test is adjusted with

A

a correction factor

19
Q

How is the air content calculated in the volumetric meter test?

A

Adding the final reading with the number of calibrated cups and subtracting the correction factor

Concrete Field Technician - G1 (6 decks)

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