Experimental study on influence of polyester fibre on temperature shrinkage performance of cement-stabilized macadam

摘要

In order to solve the cracking problems due to temperature shrinkage mostly occurred in cement-stabilized macadam, polyester fibre was added into cement-stabilized macadam and a device for measuring crack strains was developed. Based on the results from temperature shrinkage and mechanical property tests, the influence of polyester fibre on temperature shrinkage cracks and mechanical property of cement-stabilized macadam was studied. The relations between fibre contents and shrinkage coefficient, compressive strength and split strength were obtained, furthermore the improvement mechanism and the optimal fibre content were put forward. The results show that the polyester fibre have a remarkable effect on prevention of temperature shrinkage cracks; the temperature shrinkage coefficient decreases with the increasing of fibre contents, while the trength increases to maximum value and then decreases; the optimal fibre content is around 0.75‰ for improving anti-cracking performance and mechanical property of cement-stabilized macadam effectively.