The Analysis of Strength Properties by Using Stone Dust and Recycled Crushed Concrete

Nisar Ahmed , Brahamjeet Singh

Concrete is one of the most widely used materials worldwide. In 2009, the International Energy Agency reported that approximately 25 Gt of concrete is used worldwide each year, equivalent to more than 3.8 tonnes of concrete per person per year. Total construction demand is expected to reach 48.3 billion tonnes by 2015. The highest consumption was in Asia and the Pacific. Demolition to build new buildings generates a lot of waste. Among the various construction and demolition wastes, concrete waste accounts for 50% of the total waste generation. The top five causes of large amounts of concrete waste are overordering, shipping damage, installation loss, poor technology and design changes. The most common way to dispose of this waste is to dump it in a landfill, which can pollute air and water because of its high alkalinity. Therefore, recycled aggregate concrete (RAC) is an alternative to using natural aggregate (NA) in concrete. Recycled Concrete Aggregate (RCA) is aggregate obtained by recycling clean concrete waste and demolished structures. The effect of different proportions of crushed stone dust and recycled concrete on the compressive strength of M30 concrete was studied. The effect of different ratios of crushed stone dust and ground recycle concrete on the flexural and tear strength of M30 concrete is also observed.