胶粉与RET复合SBS改性沥青老化前后流变特性及其混合料性能研究

发布时间：2018-07-20 18:04

【摘要】：为了改善高海拔寒冷地区沥青路面的耐久性能,采用自制的"紫外光与热老化模拟老化环境箱"进行室内加速老化试验,模拟紫外光与热耦合作用对高原高海拔地区沥青路面的老化作用,基于延度、软化点、弹性恢复率、DSR、BBR试验和车辙、低温弯曲、冻融劈裂及四点弯曲疲劳试验研究了胶粉与RET复合SBS改性沥青老化前后流变特性及其混合料路用性能。试验结果表明:随着胶粉、RET掺量增大,复合改性沥青老化后的低温性能提高,相较于SBS改性沥青,胶粉与RET复合SBS改性沥青具有优良的抗紫外光与抗老化性能;掺加RET可显著提高低剂量SBS改性沥青及其混合料的高温性能,但是RET对胶粉、SBS改性沥青低温性能提高幅度不大,甚至有负面影响,建议采用胶粉、SBS与RET或胶粉与RET复合SBS改性方案以提高RET改性沥青混合料的低温性能;相较于SBS改性沥青和SBS与胶粉复合改性沥青,胶粉与RET复合SBS改性沥青具有优良的抗疲劳性能,对于高原高海拔强紫外光辐射地区可优先采用胶粉与RET复合改性沥青或胶粉与RET复合SBS改性沥青。工程实践证明,胶粉与RET复合SBS改性沥青能够改善路面抗车辙性能、提高路面水损害及抗裂性能,其老化前后的抗裂性能优于SBS改性沥青,采用胶粉与RET复合SBS改性沥青混合料延长了高海拔寒冷地区沥青混凝土道路的使用寿命。
[Abstract]:In order to improve the durability of asphalt pavement in cold area at high altitude, the indoor accelerated aging test was carried out by using the self-made "ultraviolet light and heat aging simulation aging environment box". Based on ductility, softening point, elastic recovery rate, DSR-BBR test and rutting, the aging effect of asphalt pavement at high altitude is simulated. The rheological properties and pavement performance of asphalt modified by SBS modified by rubber powder and RET before and after aging were studied by freeze-thaw splitting and four-point bending fatigue test. The results show that the low temperature performance of the modified asphalt increases with the increase of the content of rubber powder RET. Compared with SBS modified asphalt, the asphalt modified by rubber powder and RET composite SBS has excellent UV light resistance and aging resistance. The addition of RET can significantly improve the high temperature performance of low dose SBS modified asphalt and its mixture, but RET has little or even negative effect on the low temperature performance of rubber powder SBS modified asphalt. In order to improve the low temperature performance of RET modified asphalt mixture, it is suggested that SBS and RET or compound SBS modified asphalt should be used to improve the low temperature performance of RET modified asphalt mixture, compared with SBS modified asphalt and SBS modified asphalt with rubber powder, Compound SBS modified asphalt with rubber powder and RET has excellent fatigue resistance. Rubber powder and RET composite modified asphalt or rubber powder and RET SBS modified asphalt can be preferred for high altitude and high ultraviolet radiation area. The engineering practice has proved that the asphalt modified by rubber powder and RET composite SBS can improve the rutting resistance, water damage and crack resistance of pavement, and its anti-cracking performance before and after aging is better than that of SBS modified asphalt. SBS modified asphalt mixture with rubber powder and RET prolonged the service life of asphalt concrete road in the cold area of high altitude.
【作者单位】：中交路桥南方工程有限公司;交通运输部科学研究院;
【基金】：国家自然科学基金项目(51508032) 道路结构与材料交通行业重点实验室(开放课题)(KF201503)
【分类号】：U414

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