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高温裂解高掺量胶粉改性沥青路用性能

发表时间:2021-03-31  浏览量:311  下载量:48
全部作者: 董瑞琨,陈骏,赵梦珍
作者单位: 重庆大学土木工程学院,山地城镇建设与新技术教育部重点实验室;中建丝路建设投资集团有限公司;招商局重庆交通科研设计院有限公司
摘 要: 为探究高温裂解高掺量胶粉(pyrolyzed high content crumb rubber,PHC)改性沥青混合料性能及沥青胶结料对混合料性能影响,本研究制备了PHC改性沥青及PHC/聚乙烯(PE)复合改性沥青,以基质沥青与胶粉改性沥青为对照,并在最佳油石比下成型AC-13型沥青混合料。采用流变学试验对沥青高低温性能进行测定,通过冻融劈裂试验、车辙试验、弯曲试验和疲劳试验对混合料水稳定性、高温稳定性、低温抗裂性和疲劳性能进行评价。结果表明,PHC显著提高沥青混合料水稳定性与抗疲劳性能,60℃时多应力蠕变回复(multiple stress creep re-covery,MSCR)试验的蠕变回复率和不可恢复蠕变柔量与混合料动稳定度有较强相关性。沥青混合料累计车辙深度结果显示,PHC改性沥青混合料高温性能优于胶粉改性沥青混合料。采用PE对PHC复合改性后可大幅提高沥青及其混合料高温性能。采用破坏强度、破坏应变与应变能密度对混合料低温抗裂性进行评价,发现PHC改性沥青混合料低温性能远优于其他两种沥青混合料,PE对低温性能有负面影响。劲度模量、蠕变速率与破坏应变均有较强线性相关,相关系数分别大于0.87、0.95.
关 键 词: 道路工程;路面材料;混合料性能;脱硫裂解;胶粉类改性;高掺量
Title: Pavement performance of pyrolyzed high content crumb rubber modified asphalt
Author: DONG Ruikun, CHEN Jun, ZHAO Mengzhen
Organization: Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, School of Civil Engineering, Chongqing University; China State Construction Silk Road Construction Investment Group Co., Ltd.; China Merchants Chongqing Communications Technology Research and Design Institute Co., Ltd.
Abstract: In order to explore the pavement performance of pyrolyzed high content crumb rubber (PHC) modified asphalt mixture and the influence of asphalt binder on the performance of the mixture, in this study, PHC modified asphalt and PHC/polyethylene (PE) modified asphalt were prepared. The matrix asphalt and crumb rubber modified asphalt were selected as control groups. Under the condition of the optimal asphalt aggregate ratio, asphalt mixtures were papered by AC-13 gradation. The rheological tests were used to determine the high-and-low temperature performance of the asphalt. The freeze-thaw splitting test, rutting test, bending test and fatigue test were used to analyze the water stability, high- temperature stability, low-temperature cracking resistance and fatigue performance, respectively. The results show that PHC remarkably improves the water stability and anti-fatigue performance of the asphalt mixture. The creep recovery rate and the non-recoverable creep compliance obtained from multiple stress creep recovery (MSCR) test at 60℃ have a significant correlation with the dynamic stability of the mixture. According to the results of cumulative rutting depth, the PHC modified asphalt mixture presents a better high-temperature performance than that of the crumb rubber modified asphalt mixture. The high-temperature performance of PHC modified asphalt and its mixture is significantly improved after composite modification with PE. The failure strength, failure strain and strain energy density were used to evaluate the low-temperature cracking resistance of the mixture. It is found that the low-temperature performance of PHC modified asphalt mixture is much better than that of other two asphalt mixture, PE has a negative effect on the low-temperature performance of the mixture. The stiffness modulus, creep rate and failure strain are all strongly linearly correlated, and the correlation coefficients are greater than 0.87 and 0.95, respectively.
Key words: road engineering; pavement materials; mixture performance; desulfurization and pyrolysis; crumb rubber modification; high content
发表期数: 2021年3月第1期
引用格式: 董瑞琨,陈骏,赵梦珍. 高温裂解高掺量胶粉改性沥青路用性能[J]. 中国科技论文在线精品论文,2021,14(1):82-92.
 
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