Assessment of Fresh Properties of Pond Ash SCC

Self compacting concrete mixes were prepared by replacing fine aggregates i. e natural sand by pond ash thermal power plant waste at different replacement levels like 10, 20, 30, 40, 50, 60, 70 percent by keeping cementatious content constant as 600kg/m3 and water content 180liter polycarboxylic based superplasticizer was used to enhance workability of the concrete mixes. Fresh state properties of SCC like flow property, filling property, passing ability and segregation resistances of the mixes were checked by conducting inverted slump flow test, T500mm flow, V-shaped funnel test, V-shaped funnel test at T5min test, L-Box test method, U-Box test method were carried out according to EFNARC guidelines. Test results obtained for all the mixes were satisfying to the EFNARC specifications. Due to the porous nature of pond ash absorption of mixing water was initially high later some amount of water was released to the concrete mix by pond ash with increase in time of mixing. Upto 60 % replacement levels test results were satisfactory, for 70 % replacement level additional water was added to achieve the required mix.