半刚性基层材料抗变形能力的分析与比较
Comparative Analysis of Deformation Resistance of Semi-Rigid Base Course Materials
摘要:
为研究半刚性基层材料的抗变形能力,采用三点弯曲试验方法对底部预制裂缝的半刚性基层水泥稳定砂砾试件进行加载。通过三种典型级配半刚性基层材料配合比设计与性能测定,对比分析材料的抗变形性能。引入断裂力学中断裂韧度与断裂能作为抗裂性能的评价指标,分析水泥剂量与集料级配对抗裂性能的影响,得到水泥剂量与集料级配对抗裂性评价指标的影响规律。结果表明,以断裂韧度与断裂能的概念作为半刚性基层材料抗变形能力评价指标是合理的;骨架密实型级配,以及较低的水泥剂量的基层材料抗裂能力更好。
Abstract:
Three point bending test was used to research the anti deformation ability of semi-rigid base material. The test was under the condition of band cracks by loading the cement stabilized gravel specimens with semi-rigid precast base cracks. In order to analyze the influence of cement dosage and aggregate gradation on cracking resistance, fracture mechanics, fracture toughness and fracture energy were used as evaluation indexes of crack resistance. The influence rule of cement dosage and aggregate grade matching on crack resistance evaluation index was obtained. The results show that the concept of fracture toughness and fracture energy is reasonable to evaluate the deformation resistance of semi-rigid base materials. Semi-rigid base material has better crack resistance by using skeleton dense type gradation and lower cement dosage.
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