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Frequently Asked Questions
Cement & Concrete
Technology Home > FAQs > Factors
in Air Content
Q: What construction practices can affect the air
content of concrete?
 A:
Construction practices have a significant effect on the air content
of concrete. These include load volume versus drum capacity, haul
time, mixing or agitating speed, total revolutions of the drum before
discharge, retempering, pumping and conveyors (any high energy process
during placement including large drops), internal vibration, temperature,
and finishing practices. Air content of concrete is also affected
by the materials used in the concrete mixture and the batching process.
A good reference on this topic is PCA’s
Manual on Control of Air Content in Concrete.
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