Experimental Research On Rubber Modified Concrete Pavement

With the development of auto industry, an increasing number of waste tires will cause serious pollution. At present the effective disposal method is that comminuting tires by mechanical system and using the rubber powder as modified materials. On the other hand, the investors hope that the concrete pavement thickness could be reduced to some extent because of the limited rural roads construction fund. Therefore, the experimental research direction of this paper is to reduce the concrete stiffness by mixing in some rubber powder and reach an aim that decreasing the thickness of concrete pavement surface which is an economical way for waste tires utilization.This paper presents the test results on rubber modified concrete prismatic samples with different rubber particle sizes (5-10meshes, 80mesh) and quantities (10kg/m~3, 40kg/m~3). The contents of the experiment include the rubber surface modification by soaking in 10% NaOH solution and flexural strength and modulus tests, etc. The main research conclusions and prospects are as follows:(1) There is a decrease in flexural strength and modulus of rubber modified concrete, which mixing in rubber particle is slightly more than rubber powder.(2) The cohesiveness between rubber and cement improves after the rubber surface modification which reduces the scale of the concrete flexural strength loss but is not effective for the compressive strength. In the process of modification the rubber are easy to become agglomerate.(3) According to the rigid pavement structure design method, compared to the common concrete the thickness of rubber concrete pavement surface decreases under the same equivalent rebound modulus of base top surface.(4) Use waste tires to reduce the concrete stiffness and improve its fatigue performance in the most effective way will be the future research emphasis.(5) Based on the concept of circular economy, the future research will also focus on the renewable biological fiber modified concrete.