Concrete Air Test Results

Large aggregate pieces should be sieved out before testing.

Concrete air test results.

Also this test should not be performed on any concrete with aggregate larger than 2. Type a meter helps in the direct measurement of the change in volume in the concrete. The testing is done in a laboratory off site. The measurement of air content in fresh concrete of normal density is typically performed using the pressure method another useful test is astm c 173 however the pressure method is frequently preferred because it is relatively fast.

This is a test required to pass the american c. Lightweight concrete is typically done with the volumetric method the infamous rollermeter because the aggregate is too porous and the test results will be thrown off with so much entrapped air. The astm test method for pressure air measurement specifies two meters to measure the air content. Although the test results of fresh concrete are known immediately at least by the test technician results for compressive flexural strength or hardened air void parameters for example are not normally available until formal test reports come out.

Overview of astm c231 standard test method for air content of freshly mixed concrete by the pressure method. By then the truck was empty and the crew had completed the work. The owner wanted us to remove and replace the concrete. This is carried out by means of a column of water over the known volume of concrete.

If there is more foam in the neck than the equivalent of 2 percent air content divisions after inversion and rolling discard test and use more alcohol. Air entrained concrete is typically specified in areas of the country where frost related damage can occur. Testing should always be done carefully. Wrong test results can be costly.

If when the test is complete portions of undisturbed tightly packed concrete not sand is found at the base of the bowl when the contents have been dumped out discard test and repeat. When the field test results arrived soon after concrete placement on a recent project we were told the mix had low air content. The pressure procedure of this test method gives substantially the same air contents as the other two test methods for concretes made with dense aggregates.