Concrete Air Test Procedure

Collect a sample of concrete to perform the slum test.

Concrete air test procedure.

Entrapped naturally occurring in the mix entrained intentionally added to the mix. Method a outlines the principle of the test. 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. An air content test is required for checking air entrained concrete.

Overview of astm c231 standard test method for air content of freshly mixed concrete by the pressure method. The method of testing is given in bs en 12350 7 which replaces bs 1881. This test method cannot be used for testing lightweight concrete because the aggregate in lightweight is too porous. A sample of concrete is placed in the cylinder of an air meter in three layers each being fully compacted by hand or by vibration.

Compact the concrete by rodding 25 times. This method of testing can be used on any type of concrete lightweight regular weight or heavy weight. It has quizzes and two practice tests to prepare you for the test. The slump plate should be clean firm level and non absorbent.

Go to the online aci course. Air entrained concrete is typically specified in areas of the country where frost related damage can occur. It s good for sieve aggregate. It is intended to be a supplement to reading the astm as well as a study tool for the aci exam.

It covers the reasons you are performing this test the equipment needed and the procedure of astm c231. When the field test results arrived soon after concrete placement on a recent project we were told the mix had low air content. Stand firmly on the footpieces and fill 1 3 the volume of the cone with the sample. By then the truck was empty and the crew had completed the work.

Two types of air. See astm c173 air content by volumetric method. The owner wanted us to remove and replace the concrete. 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.

Pkf construction on turnpike i 95 concrete technician. Dampen with water and place on the slump plate. This is a test required to pass the american c. Procedure of slump test for concrete.