Ordinary Portland Cement of grade 43, conforming to IS: 8112-1989 was used. (Specific gravity was 3.15, Normal consistency as 34%, Initial setting time 99 min and Final setting time 176 min). Natural river sand confirming to zone II as per IS: 383-1970 was obtained from river banas (Specific gravity 2.63, free surface moisture 1%, fineness modulus 2.83). Coarse aggregates, 10 mm size was used 40% by weight of total coarse aggregates (fineness modulus-5.573) and 20 mm size was used in 60% by weight (fineness modulus-7.312). Crushed stone were used as coarse aggregates with an average specific gravity-2.63. Tire rubber was grinded into three sizes (powder form of 30 mesh, 0.8e2 mm, 2e4 mm). The Specific gravity of rubber powder was 1.05 and that of the other two sizes were 1.13. The three sizes of crumb rubber were mixed in definite percentages (2e4mm size in 25%, 0.8e2 mmsize in 35% and rubber powder in 40%) to bring it to zone II. This was performed in the best of our knowledge, for the first time as itwas noticed in any literature.
The chemical composition of Crumb Rubber, physical properties and chemical composition of cement are given in Thomas et al., 2014.