Practice ACI Quiz ASTM C 173 Roll-o-

(Practice ACI Quiz) ASTM C 173 Roll-o- Meter What is the air content of the following concrete sample?

Final meter reading: 5.5%

Amount of alcohol used: 2.0 pints —2 allowed

• 5.3% = (5.5-0.2)
• 5.5%
• 5.7% = (5.5+0.2)
• None of the above is the correct answer - answer b. 5.5%

After the test, if portions of undisturbed (Fresh) concrete are found in the apparatus

after disassembly:

• The test is valid
• The test is invalid
• Add one percent to the result
• Subtract one percent from the result - answer b. The test is invalid

The addition of alcohol to dispel foam after the initial filling of the meter to the zero mark

is:

• Not permitted
• Allowable after the rolling procedure to bring the liquid level within the graduated

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

• Allowable to replace any liquid that leaked from the meter during the inversion and

rolling procedures

• Mandatory - answer a. Not permitted

After rodding and tapping the final layer, ASTM C 173 requires the excess concrete to

be struck off with a:

• Tamping rod
• Trowel
• Strike-off bar
• Strike-off plate - answer c. Strike-off bar
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