Fly Ash / GGBS / Gypsum

The standard consistency of fly ash paste is defined as the percentage of water added In 300gm weight of the specimen which will permit a Vicat plunger having 50 mm length and 10 mm diameter to penetrate in the paste to a depth of 33-35 mm from the top of the mould.

Wet Sieving method is recommended for determining the Fineness of Fly Ash using 45micron sieve as recommended in various international standards. In this instrument, wet sieving is done using 45micron Sieve, Spray Nozzle, Pressure Gauge & Water source.

Test results show that, compared with the Reference Mix which reached the required strength at 28 days, the concretes with the above fly ash replacement levels reached the strength at 35 to 170 days, depending on the replacement percentage and the properties of fly ash.

The purpose of the test is to determine the specific gravity of soil passing 4.75 mm sieve by density bottle method. 50 g of sample of fly ash is taken in each 3 bottles and added with water; weight of water + bottle is taken