Correlation of Strength, Rubber Content, and Water-Cement Ratio in Roller Compacted Rubberized Concrete
This research investigated the influences of rubber content and water-cement ratio on the compressive strength of roller compacted rubberized concrete (RCR). The mix design of RCR was made by replacing same volume of sand with rubber chips based on the control concrete mix. Four rubber contents (50 kg/m3, 80 kg/m3, 100 kg/m3 and 120 kg/m3) and six water-cement ratios (0.30, 0.35, 0.40, 0.45, 0.50 and 0.55) were used. The specimen cubes were tested in compression at 28d with the load continuously and automatically measured until failure. Test results show that RCR exhibits low compressive strength but a ductile and plastic failure mode, the more the rubber used, the more the compressive strength reduced and the larger toughness obtained. Same as normal concrete, the compressive strength of RCR is also directly related to the water-cement ratio，the smaller the water-cement ratio, the higher the compressive strength. Based on the experimental results, a strength formula was developed to estimate the strength of RCR as a function of the cement strength, water-cement ratio and the rubber content.
Chaohe Chen, Yong Huang and Guangfan Li
J. F. Kang and C. X. Yan, "Correlation of Strength, Rubber Content, and Water-Cement Ratio in Roller Compacted Rubberized Concrete", Advanced Materials Research, Vols. 243-249, pp. 1179-1185, 2011