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引用次数: 3
摘要
以临界能量释放率(Jc)为指标，研究了湿损伤对橡胶改性热混合沥青(HMA)混合料抗断裂性能的影响。胶结剂的胶屑含量为重量比的15%。采用半径为76 mm、厚度为57 mm的半圆形岩心试件进行抗断裂试验。建立了加速湿损伤程序，对混合料的抗湿损伤性能进行了评价。在温度控制在25°C的水浴中，在510 mm Hg的真空条件下浸泡，不同的水分处理时间分别为0、1、2和7天。确定了水分处理时间与临界能量释放率之间的关系。目前的研究表明，经过水分处理的混合物的抗断裂性能和力学性能有所降低。随着水分处理时间的延长，降低幅度增大。结果还表明，将橡胶屑加入HMA混合料中，可显著改善混合料的稳定性、强度以及抗断裂和抗湿损伤性。
Effect of Moisture-induced Damage on Fracture Resistance of Rubber-modified HMA Mixtures
The impact of moisture-induced damage on the fracture resistance of rubber-modified hot mix asphalt (HMA) mixture as determined by the critical energy release rate (Jc) was investigated. Crumb rubber content of 15% by weight of binder was adapted. Semi-circular core specimens (76 mm radius and 57 mm thickness) were used for fracture resistance tests. An accelerated moisture damage program was established to evaluate the mixture resistance to moisture damage. Tested specimens were immersed in a water bath at a controlled temperature of 25°C under vacuum of 510 mm Hg at different moisture treatment periods of 0, 1, 2, and 7 days. A relationship between the moisture treatment period and the critical energy release rate was determined. The current investigation revealed a reduction on the fracture resistance and mechanical performance of the moisture treated mixtures. The reduction increased with the increase of moisture treatment period. The results also indicated significant improvement in mix stability, strength, and resistance to fracture and moisture damage when crumb rubber was applied to HMA mixtures.
期刊介绍：
The Journal of Elastomers and Plastics is a high quality peer-reviewed journal which publishes original research on the development and marketing of elastomers and plastics and the area in between where the characteristics of both extremes are apparent. The journal covers: advances in chemistry, processing, properties and applications; new information on thermoplastic elastomers, reinforced elastomers, natural rubbers, blends and alloys, and fillers and additives.
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