An Experimental Investigation on Properties of Concrete by Using Activated Flyash

Cement concrete is the most widely used construction material in any infrastructure development projects. The production of Portland cement, an essential constituent of concrete, release large amount of CO2 into the atmosphere.CO2 is major contributor to the green house effect and the global warming of the planet, which is a major global environmental issue currently the planet is encountering. The development and use of mineral admixture for cement replacement is growing in construction industry mainly due to the consideration of cost saving, energy saving, environmental production and conservation of resources. Mineral admixtures generally used are raw fly ash, rice husk ash, metakaolin, silica fume etc. Addition of such materials improves the concrete property. The fly ash is among the commonly used mineral admixtures as it is available in large quantities in many developing countries. The blending materials like fly ash and rice husk are already used without activation and their physical and chemical properties are studied by many authors. The performance of fly ash concrete can be improved by many means. The methods like chemical activation, mechanical and thermal activation are in practice. The objective of the present investigation is to improve the quality of fly ash by chemical treatment and to study the flexural behavior of reinforced cement concrete beams. For this project work the chemicals like sodium silicate, calcium oxide are used to activate the fly ash. In this study the material properties of activated fly ash like compressive strength, tensile strength, and flexural strength are studied with various replacements with cement like 10%, 20%, 30%, 40%, 50%, and 60%.The results are compared with fly ash concrete and control mix..