Air Meter Test Concrete Procedure

Take your sampled concrete sampled according to astm c172 and mix it up thoroughly.

Air meter test concrete procedure.

The test determines the air content of freshly mixed concrete exclusive of any air that may exist inside voids within aggregate particles. Press ur meter concrete air meter. Once the valve is depressed and held equalization occurs when the known air in the air chamber releases into the unknown air content in the concrete sample in the bowl below. Pkf construction on turnpike i 95 concrete technician.

Fill the mold in three equal layers by volume not by height. You will put in 3 layers of equal. Uses equalization to determine air content in the concrete. H 2796a roll a meter air indicator.

This is carried out by means of a column of water over the known volume of concrete. Unscrew cap allow 2 min. Determine air content specific gravity and free moisture test of aggregates. To measure the air content of the concrete the upper chamber is pressurized and then the volume of air is released into the lower chamber.

The pressure gauge on the top of the meter indicates the change in pressure as it s released into the concrete. Type a meter helps in the direct measurement of the change in volume in the concrete. Strike off the excess concrete. Astm c231 procedure wipe down the inside and rim of the measuring bowl and the cover with a wet rag to ensure that the pressure meter seals.

For this reason it is applicable to concrete made with relatively dense aggregate particles and requires determination of the aggregate correction factor see 6 1 and 9 1. H 2795p volumetair air meter. To settle and take initial reading to the nearest 25 percent. Used for the rolling method of measuring entrained air in any concrete.

Start by filling a mold 12 inches high in the shape of the frustum of a cone that is 8 inches in diameter at the bottom and 4 inches in diameter at the top. Astm method of air content measurement in concrete. Tighten cap and repeat 1 minute roll then loosen cap let settle and take second reading. The astm test method for pressure air measurement specifies two meters to measure the air content.