Paper Title
“Comparing The Standards of Coarse Aggregates in Different Regions of in India”

Abstract
In this fast-growing world, the quantum of construction waste has increased considerably in past decades, and social and environmental concerns on the recycling of the waste have accordingly been increased. It is estimated that core waste (described as those types of materials which are obtained from demolished building or civil engineering infrastructure) amounts to around 180 million tons per year or 480 kg/person/year in the EU. Waste concrete is particularly crucial among the construction wastes. Recent technology has also improved the recycling process. India has been producing a tremendous amount of construction and demolition waste (CDW) from decades. This waste has been causing great environmental problems. The use of Recycle Concrete Aggregate (RCA) made from this waste can help us to cope with both environmental and economical problems. This paper attempts to develop bench mark for the use of demolished waste concrete as a replacement of natural coarse aggregate in concrete. It also attempts to compare properties of concrete made with recycled coarse aggregate with that of concrete made with natural coarse aggregate. In this paper concrete waste from demolished structure has been collected and crushed with a mechanical jaw crusher. The various test results showed that the Recycled Coarse Aggregate is less dense, more porous, and has a higher water absorption capacity than Natural Coarse Aggregate. Recycled Coarse Aggregate is found to be slightly weaker than Natural Coarse Aggregate in terms of mechanical and physical properties but the compressive strength of concrete made from Recycled Coarse Aggregate is almost comparable with that of concrete made from Natural Coarse Aggregate. Keyword - Concrete; Crushed Aggregate; Recycled Aggregate; Workability; Compressive Strength; Petrography.