International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 01 | Jan 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 318 Partial Replacement of Cement with Fly ash Cenospheres in Cement Concrete Prof. M.C. Paliwal 1 , Pradeep Kumar 2 1 Associate Professor, Department of Civil and Environmental Engineering, National Institute of Technical Teachers Training and Research, Bhopal, India 2 P. G. Student, Department of Civil and Environmental Engineering, National Institute of Technical Teachers Training and Research, Bhopal, India -------------------------------------------------------------------------***------------------------------------------------------------------------ Abstract - Concrete is one of the important materials of the construction industries. Nowadays due to increase in a population, the demand of infrastructure is increasing day by day. This leads to increase in production of cement. In the present time the world wide cement production is about 1.6 billion tons. This huge amount of production leads to consumption of natural resources and it is also harmful for environment. Large quantity of waste by products are produced from the manufacturing industries such as mineral slag, fly ash, silica fumes etc. Cenosphere is a byproduct obtained from the thermal power plants generated by the burning of coal powder. It is transported by the flue gases which can be further collected by electrostatic precipitator. This is a free flowing powder comprises of hollow sphere, hard shelled and lightweight which is collected from coal ash. This research work deals with the partial replacement of the cement with cenosphere in concrete at various percentage such as 0%, 4%, 8%, 12%, 16% and 20% by mass of cement. The various experimental investigations are carried out to find out the compressive strength, split tensile strength and flexural strength of concrete cube cured for period of 7 and 28 days. The results obtained from the experiments with a suitable replacement of cement with cenosphere are presented in this research paper. KEYWORDS:- Concrete, Fly ash, Cenospheres, Compressive strength, Split tensile strength, Flexural strength. 1. INTRODUCTION Concrete is a most widely used construction material. It is, in general, a mixture of cement (binding material), aggregate (filler materials), admixture and water. It can be molded in any required shape, easy to handle and has a wide range of design strength. It is therefore used in approximately all kind construction work. Cement is the most important ingredient of concrete as act as a binding material. But the production of cement causes so many environmental hazards, like cement dust, air pollution solid waste pollution, noise pollution, ground vibrations and resources depletion due to raw material extraction. The main components of the gases emitted from cement industries are CO2, N2, O2, SO2, water vapors and micro components i.e. CO and NOx. The cement industry is one of the two largest producers of carbon dioxide (CO2), creating up to 8% of worldwide man-made emission of this gas, of which 50% is from chemical process and 40% from burning fuel. The CO2 produced for structural concrete is estimated at 410 kg/m 3 . About 900 kg of CO2 are emitted for the fabrication of each 1 ton of cement. The CO2 is major green house gas. Thus cement manufacturing contributes green house gases both directly through the decomposition of calcium carbonate and also through use of energy, particularly from the combustion of fossil fuel. Therefore we are needed to find other optional material for concrete in place of cement. If we able to replace few percentage of cement form concrete, it will helpful to reduce CO2 emission. From various research works, some industrial wastes are found which can reduce the amount of cement in concrete without compromising its basic properties (like strength). Granulated blast furnace slag, silica fume, rice husk ash, cenospheres and fly ash are some industrial waste that can be used as supplementary cementious materials. Cenosphere is a constituent particle of fly ash which gives some additional benefits when used in concrete. Before further discussion about cenosphere let us briefly discuss about cement. 2. OBJECTIVE OF THE RESEARCH  To study the beneficial utilization of industrial waste as the cement replacement in construction work.  To evaluate the optimum proportion of cenosphere as a beneficial replacement with cement in cement concrete