JMT - 512
AIR ENTRAINMENT METER
IS : 1199 - 1959.
As Entrainment of air limited percentage improves durability of concrete and very low percentages deteriorate it, measurement of air entrapped is freshly mixed concrete becomes important. The use of chemical adities to increase workability to concrete otrn requires an air content check to be made. Air Entrainment meters are used to determine air entrained in freshly mixed concrete by pressure method.
The apparatus consists of 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 the help of a seal. the conical cover has an air valve and a pet clock for bleeding of water. A transparent cylindrical stand pipe which is graducted in air content is fixed to the conical cover assembly.
Pressure is applied to the specimen with the help of a pressure bulb and pressure is recorded on the pressure gauge which is mounted on the stamp pipe. The whole assembly is mounted on a flat base.
the instrument is supplied complete with one each following accessories.
Calibration cylinder with spring clamp, Trowel, Tamping road, straight edge, Rubber mallet and measure.