ASTUDY ON STRENGTH PROPERTIES OF CONCRETE BY PARTIALLY REPLACEMENT OF FLY ASH AND ROBO SAND

Abstract

The Ordinary Portland Cement (OPC) which is widely used materials not consumes significant amount of natural resource energy but also pollute the effective Environment.So in this project we replace the Fly-Ash to the cement and robo sand to the fine aggregate by variable percentages. Fly ash is the by-product of the combustion of pulverized coal in electric power generation plants. Fly ash particles are minute solid spheres. Fly ash is collected from the exhaust gases by electrostatic precipitators or bag filters Color generally ranges from dark grey to yellowish tan for fly ash used for concrete. Chemical makeup of fly ash is primarily silicate glass containing silica, alumina, iron, calcium. The perfect substitute for river sand is robo sand River sand is one of the basic ingredients in manufacture of concrete.

River sand has become expensive and scarce. Therefore looking alternate to the river sand. The crusher dust is known as Robo sand can be used as alternative material to the river sand. Robo sand possess similar properties as that of river sand, hence accepted as a building material. all replacements were done to the M30 grade of concrete. The cement has been
replaced by fly ash accordingly in the percentage, and fine aggregate has been replaced by robo sand in percentage.

In this present investigation workability and strength of concrete was evaluated by replacement of Fly Ash and Robo Sand in properties of 0%,20%,40%,60%,80%,100% is suited for M30 and M40 grades of concrete cubes and cylinders were casted at the age of 7,14 and 28 days. In this present experimental study on concrete having grades of M30 and M40 are prepared by the replacement of Fly Ash and natural sand by Robo Sand. Concrete specimens were tested for evaluation of compressive strength and split-tensile strength.