The method and results obtained from this apparatus depend upon the rate at which air flows under a given pressure gradient through a bed of powder of known density and voids content, in order to determine the surface area of the individual particles.

Specification:

The complete equipment comprises of one Air permeability Cell Lea and Nurse type for areas 500 to 10000sq.cm/gm. Complete with perforated plate one capillary tube, one plunger for compaction of sample and a wooden case.

Accessories:

Air source, Comprising one Pressure chamber fitted with a valve, regulator, connecting tube, a foot pump and two drying towers. Manometer liquid in 500 ml bottles.

 

One of the durability tests of concrete is to determine permeability of water through specimen. Permeability apparatus is used for determining the permeability of cement mortar and concrete specimens of 15 cm cubes cast in the Laboratory.

Specification:

The concrete permeability apparatus comprises of a brass/gunmetal cell of squares cross section mounted on a stand and a pressure chamber is connected to the cell through copper tubing and T connector mounted on the stand with sleeve packed vale and rubber hose pipe with end connections.

 The cell assembly consists of one base plate, one metal funnel and one top plate, the pressure chamber is fitted with a pressure regulator which helps in regulating the pressure from 0-15kg/cm sq. gauge is for indicating the pressure in the cell. A foot pump and a pressure tube is supplied to develop pressure in the chamber.

 

The apparatus is supplied with a measuring cylinder 500 cc to measure percolated quantity for water. Pressure can also be applied by a pressure air line or by a compressor.

 

 

The design of concrete mix aims at maximum durability for the conditions prevailing at the site where it is to be used. ability to resist the flow of water through, is one of the important durability characteristics. The permeability is determined on cement. 

 

Specification:

Compressor with pressure gauge 0-20 kg/cm sq. with automatic pressure valve and pressure rubber hose.

 

Suitable for 440 volts A.C. three phase.

 

Specimen casting mould C.I. for 100 mm dia X 100 mm high cylinders.

 

Specimen casting mould C.I. for 150 mm dia X 150 mm high cylinders.

 

Specimen casting mould C.I. for 150 mm cubes.

 

Blow stove ½ litre capacity. Resin, Bees wax, Wire brush, Chissel, spare glass cylinder 500 cc capacity.