Air Entrainment Meter

Ref. Standard IS:1199, IS:9799

Air entrainment meter of a small amount of air in the cement concrete has been found to improve considerably the durability of concrete. The recommended limits specified for the air content are between 3% and 6.5%. Smaller percentages may result in deterioration taking place more quickly, and larger percentages may reduce the strength without any addition in the durability of concrete.
Further, when use of admixtures is made to increase workability of concrete, a check of the air content is required to ensure that the percentage of air remains between 1 to 2% to get the optimum performance of the concrete structure. For determining these percentages, Air Entrainment Meter, as specified in IS:9799, is used.
It consists of a pressure-tight flanged cylindrical measuring bowl, fitted with a removable flanged and a conical cover assembly with a seal in-between. The conical cover has an air valve and a pet cock for bleeding-off the water. A cylindrical stand pipe, which is graduated in per cent air content, is fixed on the conical cover assembly.
Required pressure is applied to the specimen with the help of a pressure bulb. The whole assembly is mounted on a flat base. Each apparatus is supplied complete with a calibrating cylinder, pressure gauge, funnel, trowel and tamping bar.
Three different modes of Air Entrainment Meters are offered :
Air Entrainment Meter,
Capacity 0.005 m3 (5 litres), suitable for aggregate size up to 75 mm
Air Entrainment Meter,
Capacity 0.1 m3 (100 litres), suitable for aggregate size up to 150 mm. Supplied with Foot Pump in place of Pressure Bulb as supplied with other models.