• Mukesh Kumar
• Shanti Lal Patel

Aggregates are the main material in concrete. The function of aggregate in concrete is to serve as filler. Aggregate give bulk to the concrete, strength, durability to concrete, decrease shrinkage and achieve economy. The main fact is that the aggregate covers 70%-75% of the total amount of each concrete mix. The strength characteristics of the concrete mix developed is dependent on the properties of aggregates used in the mix. The strength of concrete mix design is also depends on the bond strength between the aggregate and cement paste. As the construction works rapidly increasing day by day, the demand of aggregates is also increasing. This is hard to produce so much quantity at single time. Hence there is a demand for an alternative coarse aggregate arises. Demolished concrete is used to fill lands but if recycling is adopted then it may be an alternative to coarse aggregate. The objective of this paper was to conserve natural source of aggregate by using recycling coarse aggregate. Experimental studies and analysis has been done on the strength characteristics and durability by replacing coarse aggregate by recycled coarse aggregates in high strength concrete. The tests are performed for strength and durability such as test for saturated water absorption, compressive strength test of cubes, acid resistance test and porosity. We replaced the coarse aggregates in M40 concrete mix by percentage of recycled coarse aggregate i.e. 0%, 10%, 20%, 30%, 40% and 50%. A sample of reduced water/cement ratio was also tested with 50% of recycled aggregate. From tests and analysis it was observed that RCA can be used in HCS by adjusting the water-cement ratio and contents of admixture in the concrete mix. The experimental tests focused on physical properties of concrete, workability, density and mechanical properties and compressive strength of concrete with RCA. The compressive strength of RCA concrete with 60 % recycled aggregate, is about 76 % of natural aggregate concrete. As per study the amount of recycled coarse aggregate is inversely proportional to the compressive strength of concrete i.e. compressive strength decreases with increase in RCA.

RCA, w/c ratio, workability, compressive strength, durability.

"Conserve Natural Resources Of Aggregate By Using Recycled Coarse Aggregate: A Review ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 9, page no.83-88, September-2018, Available :http://www.jetir.org/papers/JETIRB006019.pdf

"Conserve Natural Resources Of Aggregate By Using Recycled Coarse Aggregate: A Review ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 9, page no. pp83-88, September-2018, Available at : http://www.jetir.org/papers/JETIRB006019.pdf