PARTIAL REPLACEMENT OF CEMENT IN CONCRETE USING WASTE GLASS POWDER AND M-SAND AS FINE AGGREGATE

Abstract

A huge amount of concrete is consumed by the construction industry. About 35% volume of concrete is comprised of sand. A good quality concrete is produced by careful mixing of cement, fine and coarse aggregates, water and admixtures as needed to obtain an optimum quality and economy. Generally cement and coarse aggregates is factory made products and their quality and standards can be easily controlled and maintained. Water used for mixing of concrete is usually tap water. The fine aggregates or sand used is usually obtained from natural sources specially river beds or river banks. Now-a-days due to constant sand mining the natural sand is depleting at an alarming rate. Sand dragging from river beds has led to several environmental issues. Due to various environmental issues Government has banned the dragging of sand from rivers. This has led to a scarcity and significant increase in the cost of natural sand. There is an urgent need to find an alternative to river sand. The only long term replacement for sand is manufactured sand. Glass is used in many forms in day-today life. It has limited life span and after use it is either stock piled or sent to landfills. Since glass is non-biodegradable, landfills do not provide an environment friendly solution. Hence, there is strong need to utilize waste glasses. Many efforts have been made to use waste glass in concrete industry as a replacement of coarse aggregate, fine aggregate and cement. Concrete is a construction material composed of cement, aggregates (fine and coarse aggregates) water and admixtures, Today many researches are going into the use of Portland cement replacements, using many waste materials like pulverized fly ash, ground granulated blast furnace slag (GGBS) etc. Like ways a waste glass powder (GLP) is also used as a binder with partial replacement of cement which take some part of reaction at the time of hydration, also acts as a filler material. In this study, waste glass powders have been used as a partial replacements to the concrete ingredient i.e. cement and the mechanical properties like compressive strength and split tensile strength are measured. For checking strength effect of replacement of cement by glass powder, the cement is replaced at 5%, 10%, 15%, 20% and 25%. Generally cement and coarse aggregates is factory made products and their quality and standards can be easily controlled and maintained, water usually is a tap water. Fine aggregates are usually natural sand. Now days due to constant sand mining the natural sand is depleting at an alarming rate. Due to various environmental issues government has banned the dragging of sand and has led to scarcity and cost effective. The only long term replacement for sand is manufacture sand. It is found that up to 15% addition of GLP gives higher strength. And also GLP size less than 90 micron is very effective in enhancement of strength.