Strength Evaluation of M30 grade Rice Husk Ash concrete using Super plasticizer

Effects of partial replacement of cement with rice husk ash on concrete properties are studied in this project. Cement is one of the most expensive constituents of concrete. The entire construction industry is searching a suitable and effective waste product that would minimize the use of cement and reduces the construction cost. In recent years the agricultural waste or by-products has received increasing attention in the economic, scientific, social and technological areas. Rice husk (RH) is a by-product of rice milling and rice husk ash (RHA) is obtained by burning of rice husk in boiler. RHA consists of large amount (approximately 85–95%) of amorphous silica. In past few years RH and its ash has been utilized extensively in different fields for synthesizing different materials and in wide variety of applications. The silica obtained from RHA provides a potential substitute to conventional silica for the synthesis of many value-added products. This project is based on increasing compressive strength with the help of rice husk ash (RHA) as partial replacement. In this study rice husk ash was prepared by open control burning, grinded and replaced with cement at 0, 10, 20, 30% respectively, with a mix ratio of 1:2.3:3.4 at a constant water cement ratio of 0.55. The compressive strength and workability test of these concrete specimens were studied. Super plasticiser sulphonated naphthalene formaldehyde (SNF) was used 0.5% by the weight of cement in this study. Due to puzzolanic reactivity rice husk ash is used as supplementary cementing materials in concrete it has economical and technical advantages to be used in concrete. Compressive strength was studied after 7 days, 14 days and 28 days specimens curing. The compressive strength of the concrete specimens decreases with an increase in the proportion of rice husk ash content. It was concluded that at 7th day of curing concrete specimen gave early strength gain while at 28th day of curing.