As Per IS : 1199-1959

As Entrainment of air in limited percentage improves durability of concrete and very low percentages, deteriorate it, measurementof air entrapped in freshly mixed concrete becomes important.

The use of chemical additices to increase work ability of concreterequires an air content check to be made.

Air Entrainment meters are used to determine air entrained in freshly mixed concrete bypressure method.

Specifications:

The apparatus consists of a pressure tight flanged cylindrical measuring bowl of 0.005 cubic meter capacity of maximum size of aggregate 38mm.

The bowl is fitted with a removable flanged conical cover assembly with thehelp of a seal.

The conical cover has an air valve and a pet cock for bleeding of the water.

A transparent cylindrical stand pipewhich is graduated in air content is fixed to be conical cover assembly.

Pressure is applied to the specimen with the help ofa pressure bulb and the pressure is recorded on the pressure gauge which in mounted on the stand pipe.

The whole assembly ismounted on a flat base. The instrument is supplied complete with one each following accessories. Calibration cylinder with spring, Trowel, Tamping Rod, Straight edge, Rubber mallet and measure.