Suchita R Saikhede Int. Journal of Engineering Research and Applications www.ijera.com ISSN : 2248-9622, Vol. 4, Issue 7( Version 4), July 2014, pp.37-40 www.ijera.com 37 | Page An Experimental Investigation of Partial Replacement of Cement by Various Percentage of Phosphogypsum And Flyash In Cement Concrete Suchita R Saikhede*, S. R. Satone**. *(Department of Civil Engineering, RTMN University, Nagpur, INDIA) ** (Department of Civil Engineering, RTMN University, Nagpur, INDIA) ABSTRACT Over 15 million tons of fly ash (FA) and 3 million tons of phospho-gypsum (PG) are produced every year. The utilization of these industrial by-product materials is important in terms of environmental and economical issues are concerned. The main purpose of this study is to evaluate the technical possibilities of incorporating FA and PG in production of concrete .In this study Combination of FA and PG is use as a mineral admixture with, phosphogypsum 0%., 5%,10%, 15% and fly ash is constant as 20% , Last proportion was taken PG- 5% and FA- 25%. . The compressive, tensile and flexural strength are studied by casting and testing specimens for 7, 14 and 28 days. It is shown that a part of ordinary Portland cement can be replaced with PG and FA to develop a good and hardened concrete to achieve economy; above 10% replacement of phosphogypsum and 20% replacement of F in concrete lead to drastic reduction not only in the compressive strength but also in Flexural and split tensile strength of concrete. Keywords: Phosphogypsum, Fly ash, Flexural Strength, Compressive Strength, Split Tensile Strength I. INTRODUCTION Rapid industrialization in developing countries continues to attract growth in urbanized areas. New construction to support urbanization, such as buildings for housing and industries, mass transit for moving people, and facilities for handling water and sewage all require construction activities. The shortage of conventional building materials in developing countries and abundantly available industrial waste products has promoted the development of new building materials (Kumar 2002). The aim of this research was to investigate the potential to use by-product materials, especially Phosphogypsum and fly ash as construction raw materials. The focus of the research concentrated on developing and maximizing cementitious reactions of waste Phosphogypsum by mixing it with other by- product fly ash, to create some cementitious binders for cement replacement. The use of abovementioned waste products with concrete in partial amounts replacing cement paved a role for (i) modifying the properties of the concrete, (ii) controlling the concrete production cost, (iii) to overcome the scarcity of cement, and finally (iv) the advantageous disposal of industrial wastes. The use of particular waste product will be economically advantageous usually at the place of abundant availability and production. Much of the literature is available on the use of fly ash, blast furnace slag, silica fume, rise husk, etc. in manufacture of cement concrete.. This paper tries to focus on the use of phosphogypsum and flyash in partial replacement of cement in concrete. II. EXPERIMENTAL MATERIALS: 2.1. Phosphogypsum Phosphogypsum was tested according to IS: 12679-1989 and found to satisfy the requirement. The specific gravity obtained was 2.89. The phosphogypsum know to have some of the chemical impurities like phosphates and World wide for most of the application as a binder or cements, etc. Table–1 Chemical Property of Phosphogypsum Chemical Constituents Percentage (%) CaO 31.2 SiO2 3.92 SO3 42.3 R2O3 3.6 MgO 0.49 Phosphate, Fluoride 18.49 2.2. Fly ash RESEARCH ARTICLE OPEN ACCESS