Concrete Air Test Steps

For purposes of accepting or rejecting the load.

Concrete air test steps. Air entrained concrete is typically specified in areas of the country where frost related damage can occur. It is intended to be a supplement to reading the astm as well as a study tool for the aci exam. This should be done as soon as discharge of the concrete commences. The sample should be representative of the concrete supplied.

It covers the reasons you are performing this test the equipment needed and the procedure of astm c231. Important steps in the volumetric test. When the field test results arrived soon after concrete placement on a recent project we were told the mix had low air content. It s good for sieve aggregate that would be retained on a 1 1 2 sieve over a 1 sieve.

3 2 this test method and test method c138 c138m and c173 c173m provide pressure gravimetric and volumetric procedures respectively for determining the air content of freshly mixed concrete. Sampling after 0 2 m3 of the load has been poured. Entrapped naturally occurring in the mix entrained intentionally added to the mix. By then the truck was empty and the crew had completed the work.

The sample is taken in one of two ways. Check out these great books about concrete. See astm c173 air content by volumetric method. Sampling the first step is to take a test sample from the large batch of concrete.

Kelly maunder of ground engineering conducting a standard concrete air test. This test method cannot be used for testing lightweight concrete because the aggregate in lightweight is too porous. 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 guide will teach you how to test air content of concrete with a type b pressure meter.

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. The three cube sample shall be taken from the delivered fresh concrete and kept it in the curing tank for 28 days or after 24 hours the concrete sample would be demoulded and it will be sent directly to the approved third party laboratory to ensure its curing. This method of testing can be used on any type of concrete lightweight regular weight or heavy weight.