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沥青材料具有自愈性能,并通过对微损伤的修复,使沥青路面可持续使用。然而,沥青材料的自愈通常和粘弹性变形的恢复同时发生,使得沥青材料的愈合性能分析变得复杂。该文在控制材料损伤条件下,并排除粘弹性模量恢复的影响,对沥青结合料的自愈性能进行评价。首先,该文制定了一个愈合试验方案和数据分析方法,通过试验可以对沥青造成损伤并在间歇期前评定损伤等级,然后在愈合过程中监控沥青材料性能的变化和评价损伤愈合的程度;其次,建立愈合方程,在不同损伤等级及温度下模拟沥青材料的愈合性能。基于两种材料(PG 64-28、PG 70-28)的试验结果,发现在沥青材料模量长期的恢复过程中,主要受到自愈性能的影响,而粘弹性模量恢复在荷载移除后的早期就会发生,而且,沥青材料的愈合性能和疲劳性能的恢复受温度和损伤等级的影响很大。
Asphalt material with self-healing properties, and through the repair of micro-damage, so that asphalt pavement sustainable use. However, the self-healing of bituminous materials often occurs simultaneously with the recovery of viscoelastic deformations, complicating the analysis of the healing properties of bituminous materials. In this paper, under the control of material damage conditions and excluding the influence of viscoelasticity modulus recovery, the self-healing properties of asphalt binder were evaluated. First, the article developed a healing test protocol and data analysis method, which can be used to test the asphalt damage and assess the damage level before the intermission, and then monitor the change of the performance of the asphalt material during the healing process and evaluate the degree of lesion healing. The healing equation was established to simulate the healing properties of asphalt at different damage levels and temperatures. Based on the experimental results of the two materials (PG 64-28, PG 70-28), it was found that during the long-term recovery of asphalt material modulus, it is mainly affected by self-healing properties, while the recovery of viscoelastic modulus after load removal Early recovery occurs, and recovery of bitumen’s healing and fatigue properties is greatly affected by temperature and damage levels.