International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 01 | Jan 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1428 STUDY ON EFFECT OF PARTIAL REPLACEMENT OF CEMENT BY RICE HUSK ASH ON PROPERTIES OF CONCRETE Manish Verma 1 , Dr. Jitu Kujur 2 1 M.Tech Scholar, Department of Civil Engineering, BIT, Sindri, Dhanbad(Jharkhand) 2 Associate Professor, Department of Civil Engineering, BIT, Sindri, Dhanbad(Jharkhand) ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract –This study aims to optimize the use of rise husk ash in increasing the strength of concrete. Rice husk ash is one of the major byproduct of rice mill industry. Rice husk ash has huge proportion of silica in it and behaves as a good cementious material due to the presence of silica in it. The fineness of rice husk ash particles allows it to get filled in between the voids in the concrete and thus increases the density of the concrete. The benefit of replacing cement with rice husk ash is that it is cheaply available, have high surface area, high silica content and high fineness modulus. In this study some proportion of cement is replaced with rice husk ash for M30 grade of concrete and the properties of new mix with 5 percent, 10 percent, 15 percent and 20 percent is compared with 0 percent replacement of RHA. The comparison of the results show that the compressive strength of concrete increased maximum upto 7.234 percent at 7 days and 8.978 percent at 28 days and split tensile strength increased maximum upto 8.367 percent at 7 days and 11.932 percent at 28 days at 15 percent replacement of cement with RHA. Also the flexure strength increased maximum upto 1.96 percent at 7 days and 1.06 percent at 28 days with 10 percent replacement of cement by RHA. Key Words: RHA(Rice Husk Ash), OPC(Ordinary Portland Cement), FA(Fine Aggregate), CA(Course Aggregate), IS(Indian Standard), SCM(Supplementary cementing materials) 1.INTRODUCTION Concrete is the commonly used construction material due to its structural stability, durability and strength. The demand of concrete is increasing day by day due to growing population, urbanization, transportation and industrialization. Due to this there is a scarcity of resources like cement, fine and coarse aggregate required for making concrete. On other side speedy growth of industrialization contributed to different types of waste by-product which is environmentally risky. So, the industrial wastes are effectively used in the concrete to save the environment. In civil construction some industrial wastes are utilized in various works. Concrete is the most frequently used building material on the planet, second only to water in terms of usage. Concrete is a man- made substance used to construct a wide range of constructions. It is composed of aggregate kept together by cement, sand, and water. Every year, billions of tonnes of concrete are made, necessitating a colossal amount of raw materials. The concrete industry has also been dubbed the "most natural resource-intensive" industry. Aside from the depletion of natural resources, the production of ordinary portland cement (OPC), the major binder in concrete, is one of the most significant sources of human-caused carbon dioxide. Furthermore, increased carbon emissions from OPC manufacturing are projected in the next years due to the planned exponential increase in concrete/cement consumption. As a result, the concrete industry, particularly OPC, must find a solution to reduce or replace the amount of natural resources used in concrete. Over the years, a variety of methods have been examined, including partial to complete OPC replacement, the use of waste materials as aggregate in concrete, the use of wastewater, and so on. One of the most effective ways to reduce the embodied carbon of concrete is to partially replace OPC with extra cementitious ingredients. SCMs are mostly waste materials with pozzolanic and hydraulic properties. SCMs such fly ash, slag, silica fume, metakaolin, and rice husk ash (RHA) have been used as a partial replacement over the years. SCMs in concrete also provide a way to manage these wastes, lowering the risk of environmental damage as a result of their disposal. These SCMs have varying effects on the fresh and hardened characteristics of concrete, and the most effective technique to incorporate these waste materials into concrete has been reported to be proper type selection and OPC replacement level. RHA, a type of SCM and agricultural waste, has been discovered to improve the mechanical and durability of concrete. Due to its high reactivity and silica concentration, RHA is a preferred SCM above fly ash and silica fume. 2. MATERIALS USED IN THE STUDY 2.1 CEMENT The cement used in this study was Ordinary Portland Cement of 43 grade with trade name “ULTRA TECH” bought from the local market near BIT SINDRI. The physical properties of cement are given in the table 1 below. Table -1: Physical properties of cement Sl. No. Parameter Test results 1. Fineness 5.0% residue on 90micron I.S sieve.