废旧轮胎堆积造成“黑色污染”已成为世界各国普遍面临的环境问题,为了有效利用废旧轮胎,解决橡胶粉作为改性剂的难点,采用3种不同剂量的废旧橡胶轮胎粉(CR7、CR10、CR13)作为改性剂,研究其对基质沥青AH-70物理特性和动态流变特性的影响,矿料级配采用AC-13型,对这4种沥青混合料进行马歇尔试验、车辙试验、劈裂试验、低温弯曲试验测定,分析橡胶粉掺量对沥青性能的影响。试验结果表明,橡胶粉的加入有效提高了沥青高温性能、水稳定性和低温性能,综合得出,CR10改性沥青混合料比AH-70、CR7和CR13沥青混合料具有更好的路用性能。研究成果为废旧橡胶轮胎用于公路建设的再生利用,提供理论参考和借鉴。

The accumulation of waste tires will lead to "black pollution", posing environmental problems. In order to use effectively the waste tire rubber, solve the technical problems about using the waste tire rubber as a material additive, tests were conducted on asphalt mixtures of four types (AH-70, CR7, CR10 and CR13) made from waste tire rubber, in AC-13 aggregate gradation. The physical and rheological characteristics are analyzed through the Marshall experiment, rutting test, splitting test, bending test at low temperatures for the four types of the asphalt mixture. The analyses include the effects of rubber power contents on the properties of the asphalt. Test results show that the addition of rubber power would effectively improve the performance and the temperature sensitivity. Compared to AH-70, CR7 and CR13, the rubber modified bitumen CR10 is found to have the most satisfactory pavement performance.