Due to environmental and economic advantages, cold mix asphalt (CMA) can be considered as a good alternative to conventional hot mix asphalt (HMA). Nevertheless, it has inferior performance compared to HMA, so that the application of CMA is not recommended in the surface layer of pavements subjected to high traffic volume and/or regions with very cold or hot climate. Considering the high potential of distress occurring in the CMAs, this research is aimed at investigating the effect of crumb rubber (CR) on fracture and moisture damage resistance of the CMAs. Different CR percentages were applied through two different modification methods and, then by means of Semi-Circular Bending (SCB) test, the fracture energy and flexibility index (FI) of modified CMAs were obtained and compared with the unmodified HMA and CMA. The moisture sensitivity of the modified CMAs was also evaluated using modified AASHTO T 283. Moreover, the effects of the addition of cement along with CR were investigated. The results show that simultaneous use of 14% CR and 2% cement in the CMA can considerably improve the fracture and moisture damage resistance so that it has comparable performance to the conventional HMAs.

由于环境和经济优势，冷拌沥青 (CMA) 可被视为传统热拌沥青 (HMA) 的良好替代品。然而，与 HMA 相比，它的性能较差，因此不建议在交通流量大的路面和/或气候非常寒冷或炎热的地区使用 CMA。考虑到 CMA 中发生的高危风险，本研究旨在研究橡胶屑 (CR) 对 CMA 的抗断裂和耐湿损伤性的影响。通过两种不同的改性方法应用不同的CR百分比，然后通过半圆弯曲（SCB）试验，获得改性CMA的断裂能和柔韧性指数（FI），并与未改性的HMA和CMA进行比较。还使用改性 AASHTO T 283 评估了改性 CMA 的湿度敏感性。此外，还研究了添加水泥和 CR 的影响。结果表明，在 CMA 中同时使用 14% CR 和 2% 水泥可以显着提高抗断裂和抗湿破坏性，使其具有与传统 HMA 相当的性能。