Comparison of different waste materials used as cement replacement in concrete

Abstract

Among all the construction materials used in construction industry concrete is the most used one. With its main cementing ingredient being OPC But production of OPC comes at a cost both financial and environment that is why if OPC can be replaced to some extend by another material that is cheaper to produce than financial and environmental cost of concrete can be reduced significantly. Some industrial waste materials have cementing and pozzolanic properties thus they can used to replace cement in some proportion that will reduce the pollution as well as the cost that is caused by dumping of such materials. when used correctly such materials have positive impact on both fresh and hardened concrete such as increased strength, increased durability, higher workability, reduced permeability, higher resistance to acid attack and reduction of plastic shrinkage cracking therefore in this paper three industrial waste materials I.e. Fly ash, Silica fume and Ground Granulated Blast furnace slag are considered for their use as cement replacement materials. The mechanical properties were evaluated from the compressive Strength, while the durability was inspected in terms of chloride diffusion, permeability and at the same time Workability of concrete was also compared Use of such materials is both cost and environment friendly and these two words are seldom used together thus more public awareness and better standards are required for wide use of such waste materials in this regard.