Deformation properties improvement of cement stabilized gravel using rubber: Laboratory and field study

Abstract

The object of this study is to explore the deformation properties of rubber particle modified cement stabilized gravel base. The deformation law of rubber particle modified cement stabilized gravel under the effect of dehydration-drying, large temperature difference and salt erosion was clarified. The test road was paved. By means of field monitoring, the deformation properties of the test road were studied. The variation law of top–bottom temperature difference between rubber particle modified cement stabilized gravel base and ordinary cement stabilized gravel base was compared and evaluated. And the correlation between base temperature and the strain was revealed. The results show that rubber particles can improve the deformation properties of cement stabilized gravel. The average expansion coefficient and average temperature shrinkage coefficient decreased by 40.9% and 48.9%, respectively. During heating, the total strain of salt expansion at 0.3% and 0.6% salt content decreased by 33.5% and 85.4%, respectively. During cooling, the strain of salt expansion decreased by 75.9% at 0.3% salt content, but the improvement effect decreases rapidly with the increase of salt content. The maximum daily strain of rubber particle modified cement stabilized gravel base decreased by 25.9%–30.5%. The maximum difference in annual strain decreased by 19%. And the top–bottom temperature difference of the base decreased by 24.3%.