Currently India has taken major initiative on developing the infrastructure, to meet the requirements of globalisation in the construction of building and other structures. As the most popular and economical construction materials today concrete naturally places the rightful role in these activities as increasingly large quantum of concrete is being utilised. In the absence of available alternative construction materials it is becoming a herculean task to meet the increasing demand of

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... on industries and promote sustainable construction so that natural resources are exhausting in no time and ecological hazards do grow at uncontrolled rate. Because of environmental and economic reasons, there is a rethinking about the use of cement and instead its partial or total replacement by Industrial waste as an alternative material in the concrete production is receiving priority. This not only reduces the cost of production of concrete but also controls the pollution leading to sustainable development. There are incidental benefits in terms of improving performance. Alternative materials generally used are mainly the industrial wastes which face the problem of safe disposal and cause environmental hazards. Fly ash is such Industrial waste which is generated in huge quantity face the problem of safe disposal. Fly ash is a by-product developed by a Industrial waste during the production of electricity in thermal power plants, India at present productions around 200 million tons of fly ash per annum. Due to its highly pozzolanic and cementitious property, flyash can be used in the much larger amount as a cement replacement material in concrete then practice as of today. Experimental investigation were carried out to explore the effect of fly ash based geopolymer concrete, where fly ash was collected from two sources and 30% of fly ash is replaced by GGBS. The alkaline solution was used NaOH and Na 2 SiO 3. From this research, it is found that using different sources of fly ash results in different in strength. The fly ash in which low aluminium and high silica content shows high in strength, also more fine fly ash shows high in strength. Comparison of compressive strength, split tensile strength and flexural strength are carried out.