• Mohammed Ali Shaik
• Prof. S.M. HASHMI
• Mohammad Akbar Ahmed

The investigation is aimed to study the effect of induced combined index of coarse aggregate on characteristic strength of concrete using manufactured sand as fine aggregate. The experimental program consists of basic laboratory testing of all materials required, separating flaky and elongated aggregate, testing of fresh concrete, casting of cubes (15x15x15 cm) and beams (50x10x10 cm) and critical study on test results. Total 42 cubes and 21 beams were casted out of which 36 cubes and 18 beams were casted using manufactured sand with variation of combined index of coarse aggregate 0% (normal aggregate) 0% (rounded aggregate), 10%, 20%, 30% and 40%. Remaining 6 cubes and 3 beams were casted using natural sand as fine aggregate for comparison. To study the characteristic strength of concrete all cubes and beams were tested after 28 days curing. For each 10% increase in combined index compressive strength is increasing by 4 % till 30% combined index. In case of beams for each 10 % increase in combined index the flexural strength is increasing by 2- 8% till 30% combined index. For concrete made with manufactured sand with normal (procured) aggregate, the compressive and flexural strength was found to be 8% and 17% higher that the concrete made with natural sand.

combined index, coarse aggregate, manufactured sand and natural strength, workability, compressive and flexural strength

"Study on Effect of Induced Combined Index of Coarse Aggregate on Characteristic Strength of Concrete using Manufactured Sand", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.304-310, June 2019, Available :http://www.jetir.org/papers/JETIR1908986.pdf

"Study on Effect of Induced Combined Index of Coarse Aggregate on Characteristic Strength of Concrete using Manufactured Sand", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp304-310, June 2019, Available at : http://www.jetir.org/papers/JETIR1908986.pdf