INVESTIGATION ON STRENGTH PROPERTIES OF FLYASH BASED GEOPOLYMER CONCRETE AND PARTIAL REPLACEMENT OF FINE AGGREGATE WITH M-SAND

Abstract

Concrete is one of the most vital building materials subsequent to the water. Day by day demand of concrete is escalating with rising demand on infrastructural development, but due to the emission of a considerable quantity of CO2 throughout the course of the production of cement is the principal issue concern with environmental pollution. The output of ordinary Portland cement adds about 5 to 7% of total greenhouse gas emission. As a result, it is essential to discover a substitute for cement. Fly ash is a waste material which is comprised of a great volume of silica and alumina. Fly ash is also a by-product of coal received from the thermal power station. In this research work, fly ash is employed to produce geopolymer concrete. Geopolymer is a cement-free concrete which is produced when silica and alumina react chemically with the alkaline solution. In geopolymer, fly ash function as a binder and alkaline solution function as an activator. The natural river sand has a huge demand in the developing countries to meet the active infrastructure growth. In this circumstance, emerging country like India facing a deficit in the sound quality natural sand. To minimize these difficulties, recently Manufactured sand is employed as a partial replacement with natural river sand. Fly ash and alkaline chemical activator undergo geopolymerization process to make aluminosilicate gel. In this study, fly ash based geopolymer concrete is developed with partial replacement of river sand with M-sand at various percentage replacements from 0 to 100%. An alkaline solution with 2:5 ratio of sodium silicate and sodium hydroxide was used in this research work. The strength behaviors of the geopolymer concrete enhance with rising the percentage replacement of M-Sand.