Vol-3 Issue-1 2017 IJARIIE-ISSN(O)-2395-4396 3625 www.ijariie.com 69 EFFECT OF ALKALINE ACTIVATOR ON THE STRENGTH OF GEOPOLYMER CONCRETE Sagar Chavan 1 , Girish Joshi 2 , Sandeep Hake 3 1 PG student, Civil Engineering, GHRCOEM Pune, M.S., India 2 Associate Professor, Civil Engineering, GHRCOEM Pune, M.S., India 3 Associate Professor, Civil Engineering, GHRCOEM Ahmednagar, M.S., India ABSTRACT Cement industry is one of the major contributors to the emission of greenhouse gasses. That is cement production consumes huge amount of virgin materials in atmosphere, which is one of cause of global warming. Also, in India more than 100 million tons of fly ash is produced annually. Which acts as a binder instead of cement in concrete. The activators were used like sodium hydroxide, potassium hydroxide and 50% of sodium hydroxide, 50 % of potassium hydroxide. In this study solution to fly ash ratio of 0.35 with 13 Mole concentrated sodium hydroxide solution and potassium hydroxide is used and grade chosen for investigation was M30. All the specimens were cured in oven at 60 0 C, 100 0 C and 140 0 C for 12 and 24 hours duration. All tests were conducted according to Indian standard code procedure. Test results for compressive strength, split tensile strength and flexure strength are tabulated and discussed in details and some important conclusions are made. Keyword: - Alkaline solution, Fly Ash, Curing, Temperature, Compressive strength. 1. INTRODUCTION India is a developing country and it is developing in various sectors. Infrastructure is one of the important part of it. For that the construction industry has grown up rapidly. As the number of construction industry increases the use of cement concrete also grown astronomically and it will continue to grow as the result of continuous urban development. It is estimated that the production of cement is increased about 1.5 billion tons in 1995 to 2.2 billion tons in 2010 and still increasing rapidly now-a-days. Ordinary Portland cement is conventionally used as the primary binder to produce concrete. By comparing the cement concrete with other construction material it have many benefits like easily available material, strength and durability, versatility, affordability, low maintenance, making process is easy etc. Though the cement concrete has such advantages it has some disadvantages also such as low tensile strength, less ductility and it creates environmental pollution. On the other side, fly ash is the waste material of coal based thermal power plant, available abundantly but have a disposal problem. As it is light in weight and easily flies with some good advantages like Environmental Benefit, High Strength, Resistant to Heat and Cold Chemical Resistance so it is better to use in construction. 2. METHODOLOGY This details presents development of the process of making geo polymer concrete. Although geo polymer concrete can be made using various source materials, the present study used only low-calcium (ASTM Class F) dry fly ash. Also, as in the case of OPC, the aggregates occupied 75-80 % of the total mass of concrete. In order to minimize the effect of the properties of the aggregates on the properties of fly ash based geo polymer, the study used aggregates from only one source. Most of the information particularly initial mix composition and test methods given in this