纤维掺量对水稳碎石力学性能影响分析

Analysis on Impact of Fiber Content on Mechanical Property of Cement-Stabilized Macadam

摘要:

水泥稳定碎石是我国路面基层的主要材料类型，其性能对道路服务能力有直接影响。以自主研发高韧纤维为核心，研究纤维水稳碎石抗折、干燥收缩、变形能力和综合性能的变化规律，以及纤维掺量的影响。结果表明：掺入纤维可以提高水稳碎石抗折强度，但不同掺量时，抗折强度差距不大，1‰掺量时弯拉强度最大，较普通水稳碎石提高 8.29%；掺入纤维可以降低水稳碎石干缩系数，干缩系数随纤维掺量的增加先降后升，1‰时改善最优；掺入纤维可以显著提高水稳碎石峰值应变，且峰值应变随纤维掺量的提高呈现单调增长态势；从综合性能角度看，1‰为最佳纤维掺量，综合性能指数提升56.6%。

Abstract:

Cement-stabilized macadam is the main material type of pavement base courses in China, and its property has a direct impact on road serviceability. Focusing on self-developed high-toughness fibers, the variation laws of flexural strength, drying shrinkage, deformation capacity and comprehensive performance of fiber cement-stabilized macadam, as well as the influence of fiber cement are studied. The result shows that the addition of fibers can enhance the flexural strength of cement-stabilized macadam, but the difference in flexural strength is not significant when the content varies. When the content is 1‰, the flexural tensile strength is the highest, which is 8.29% higher than that of ordinary cement-stabilized macadam. The addition of fibers can reduce the drying shrinkage coefficient of cement-stabilized macadam. The drying shrinkage coefficient first decreases and then increases with the increase in fiber content. The best improvement is achieved at 1‰. The addition of fiber content can significantly increase the peak strain of cement-stabilized macadam, and the peak strain shows a monotonically increasing trend with the increase of fiber content. From the perspective of comprehensive performance, 1‰ is the optimal fiber content, and the comprehensive performance index increases by 56.6%.