EFFECT OF RECYCLED AGGREGATE ON NORMAL STRENGTH CONCRETE

Recycled coarse aggregate (RCA) concrete construction technique can be called as ‘green concrete’, as it minimizes the environmental hazard of the concrete waste disposal. Coarse aggregate plays a vital role for formation of concrete as the amount is more than that of fine aggregate. In the present experimental study is carried out to determine the strength characteristic of recycled aggregate in structural concrete as an alternative material for coarse aggregates. For a particular mix design, coarse aggregate is replaced with recycled bricks by 0%, 10% and 20%. A mix of M35 grade concrete was designed. Firstly the casting and testing of specimens for M35 grade concrete was carried out. In Phase-II, the test results are compared with different code values. Fresh concrete was tested for its workability properties through slump test, compaction factor test and Vee-Bee test. Compressive, flexural and split tensile strength test for recycled coarse aggregate concrete was carried out for hardened concrete. Results of the present study are compared with similar results available in literature associated with normal coarse aggregate. The obtained values of strength were compared with the IS-456- 2000, ACI-1985, ACI-1992 and ACI-1995 results. Compressive strength, flexural strength and split tensile strength reduces with increase in percentage of recycled aggregate but the reduction is not prominent up to 20%. The experimental results were well in agreement with IS-456-2000 predicted results. ACI-1985 and ACI-1992 overestimates while predicted values by ACI- 1995 underestimates.