Study On Brittleness And Ductility Of CRC And The Application In The Cover Layers Of Bridges

As a new kind of concrete material of energy-saving and environment protecting, Crumb of Rubber Concrete (CRC) is paid broad attention to by people of architectural circle because of its good engineering performance such as lower Young's modulus, lower brittleness, perfect ability of holding back crack and high damp modulus. CRC has a new kind of material-rubber crumb in it as its third bone component which is the most distinct trait of it in composing. One hand, the brittleness of concrete has improved obviously because of the joint of rubber crumb, by which the traditional viewpoint of regarding concrete as brittle has been broken. On the other hand, the ductility of Reinforced Crumb Rubber Concrete (RCRC) beam has also improved greatly just because of the same reason.Brittleness modulus has been adopted to measure the brittleness of CRC, which is defined as the ratio of compressive strength to bending strength of CRC. The smaller the brittleness modulus was, the lower brittleness of the concrete was. And the brittleness of CRC has been studied though experiments in different temperature environment.Also, ductility modulus has been adopted to measure the ductility of RCRC beam, which was defined as the ratio of ultimate curvature of section to subdued curvature of section of RCRC beam. In this paper, the study of the ductility modulus of RCRC beam has been carried out initially in theory, and the experimental study haven't been carried out yet. A series of ductility modulus of sections with different trait have been calculated based on the academic analysis above, while, the steel analysis of double–steel section of RCRC beam has also been carried out under the same load.With the fact that the first experimental section which is located at the entrance of Shi Jiazhuang in HeBei province in Qing-Yin Highway was paved with CRC successfully in November, 2005 and the variety of advantages in engineering performance of CRC, we studied further, analyzed the feasibility of the application to cover layers of bridges. and the experimental section with CRC applied to cover layers of bridges has been paved on the Dongkou Bridge of 200 doors in the Wuxiang Road in Wuqing District of Tian Jin in August, 2006...