ASTM C231 Concrete Air Content
Testing: Principles, Procedures, and
Standards Exam Questions and Answers
with Verified Solutions | Latest Updated
2026
What does ASTM C231 Air content of freshly mixed
measure? concrete using the pressure method
What principle is ASTM C231 Boyle's Law
based on?
What type of aggregates is Relatively dense aggregates
ASTM C231 applicable to?
What type of aggregates is Lightweight, porous, or air-cooled
ASTM C231 NOT applicable to? blast-furnace slag aggregates
What test should be used ASTM C173 (Volumetric Method)
instead of C231 for lightweight
aggregate?
What type of concrete is NOT Nonplastic concrete (e.g., pipe or
suitable for ASTM C231? masonry units)
What are the two types of air Type A and Type B
meters in ASTM C231?
, How does a Type A meter Measures volume change by
work? observing water level drop under
pressure
How does a Type B meter Equalizes known air pressure with
work? unknown air in sample and reads
directly on gauge
What is the minimum capacity 6.0 L (0.20 ft³)
of the measuring bowl?
What is the required shape of Essentially cylindrical
the measuring bowl?
What is the acceptable ≤ 0.1% air content
expansion factor limit?
What is the required tamping 16 mm (5/8 in.)
rod diameter?
How many layers are used 3 layers
when rodding concrete?
How many rodding strokes per 25 strokes
layer?
How many mallet taps per 10-15 taps
layer?
When should vibration be used For low slump concrete (<25 mm / 1
instead of rodding? in.)
Testing: Principles, Procedures, and
Standards Exam Questions and Answers
with Verified Solutions | Latest Updated
2026
What does ASTM C231 Air content of freshly mixed
measure? concrete using the pressure method
What principle is ASTM C231 Boyle's Law
based on?
What type of aggregates is Relatively dense aggregates
ASTM C231 applicable to?
What type of aggregates is Lightweight, porous, or air-cooled
ASTM C231 NOT applicable to? blast-furnace slag aggregates
What test should be used ASTM C173 (Volumetric Method)
instead of C231 for lightweight
aggregate?
What type of concrete is NOT Nonplastic concrete (e.g., pipe or
suitable for ASTM C231? masonry units)
What are the two types of air Type A and Type B
meters in ASTM C231?
, How does a Type A meter Measures volume change by
work? observing water level drop under
pressure
How does a Type B meter Equalizes known air pressure with
work? unknown air in sample and reads
directly on gauge
What is the minimum capacity 6.0 L (0.20 ft³)
of the measuring bowl?
What is the required shape of Essentially cylindrical
the measuring bowl?
What is the acceptable ≤ 0.1% air content
expansion factor limit?
What is the required tamping 16 mm (5/8 in.)
rod diameter?
How many layers are used 3 layers
when rodding concrete?
How many rodding strokes per 25 strokes
layer?
How many mallet taps per 10-15 taps
layer?
When should vibration be used For low slump concrete (<25 mm / 1
instead of rodding? in.)
