Properties of self-compacting concrete (SCC) admixing sawdust ash (SDA) cement as replacement

Abstract

Research on needs of cementatious materials as a substitute for cement in construction industries have been for a time immemorial. Cement is the most useful element in concrete next to water however; its production is energy intensive and produces a lot of CO2. In this study the Saw dust ash (SDA) was used to partially replace OPC in SCC. A number of trials mixes were conducted to obtain the control grade 40 SCC. Then later a mix proportion varied at 5, 10, 15, 20, 25 and 30 percentages by weight of SDA as OPC replacement in SCC using a plasticizer of 7.49 kg/m3 in accordance to standard specification. The effects of SDA-SCC on hardened properties were studied at 3, 7, 28, 56 and 90 days curing. The study reveals improvement in the resistance against segregation. While, 0% - 10% and 0% - 15% the satisfied the requirement for slump flow and passing ability of SDA-SCC respectively. Similarly, compressive strength reduces with increase in SDA content at 15 to 30 %.