MORTAR PERMEABILITY TESTER 3 UNITS
This method of test covers the procedure for determining the permeability to water of the pozzolana mortar prepared and cured under specified conditions, by measuring the percolation of water through Standard cylindrical specimens.
The permeability unit shall consist of a specimen container ring of 100 mm diameter and 50 mm high, held between a bottom plate and a water cell. The hydraulic head for testing shall be obtained by connecting the unit to a compressor through a water pressure vessel. A pressure regulator and pressure gauge shall be included between the compressor and the water pressure vessel to indicate the test pressure. Water percolating throught the specimen shall be collected in a container. Typical details of an individual unit are given in fig. 6 and 7. The water cell shall be 100 mm diameter brass cylinder and the top and bottom plates shall be either of brass or any other non-corroding metal. The connecting pipeline from the water cell to the water pressure vessel shall also be of non-corroding metal or of hard board polythene. This requirement is necessary since the tests last over a number of days in which mild steel or similar materials will get corroded and the rust formed will coat the top of the specimens and affect the permeability. The connection of units to the air cylinder shall be done with armoured heawy-duty rubber hose.