ACM改性沥青及混合料老化性能及耐老化机理研究

发布时间：2018-05-06 09:06

本文选题：沥青综合改性剂(ACM) + 改性沥青　；参考：《山东大学》2017年硕士论文

【摘要】：为提高沥青及沥青混合料的路用性能与抗老化性能,在课题组前期研究的基础上,研发制备了四种沥青综合改性剂(Asphalt Comprehensive Modifier,简称ACM),本文重点研究四种沥青综合改性剂改性沥青(4种ACM×3个掺量×2种沥青+70号沥青及SBS改性沥青=26种沥青)及沥青混合料的老化性能,并探讨不同沥青的抗老化机理。本研究为沥青综合改性剂的推广应用及进一步优化研究提供了理论基础与科学依据,具有重要的工程应用意义及一定的理论参考价值。论文采用沥青旋转薄膜加热试验与烘箱连续加热试验分别模拟沥青的短期老化与长期老化过程,通过测试26种沥青老化前后的三大常规指标以及布氏旋转粘度,分析评价不同沥青的老化性能及老化规律;然后通过荧光显微试验和红外光谱分析探讨ACM改性沥青的改性机理与抗老化机理;最后通过ACM改性沥青混合料老化前后的路用性能分析验证沥青的老化性能。研究表明:(1)对于改性70#沥青而言,ACM4改性剂的抗老化性能最优,其次为ACM2和ACM3,最差的为ACM1;与70#沥青相比,除了 ACM1改性70#沥青之外,其余改性沥青的抗老化性能都优于70#沥青,但都不如SBS沥青的抗老化性能。(2)对于复合改性SBS改性沥青而言,ACM2改性剂的抗.老化性最优,其次为ACM4和ACM1,最差的为ACM3;除ACM3改性SBS沥青之外,ACM复合改性SBS沥青的抗老化性能全部优于SBS沥青。(3)沥青微观形貌越稳定,改性剂分子分布越密集越均匀,沥青的抗老化性能越好;羰基指数CI和亚砜基指数SI越大,沥青的老化程度越重。(4)提出了表征沥青老化程度的综合老化指数(CAI),建立了 CAI与羰基指数CI和亚砜基指数SI之间的关系方程,利用红外光谱试验与该方程可以评判不同沥青的抗老化性能。
[Abstract]:In order to improve the pavement performance and anti-aging performance of asphalt and bituminous mixture, on the basis of the previous research of the research group, Four kinds of asphalt comprehensive modifier Asphalt Comprehensive modifier (acme) have been developed and prepared. In this paper, the aging properties of four kinds of asphalt modified by synthetic modifier, 4 kinds of ACM 脳 3 kinds of bitumen 70 and 26 kinds of SBS modified bitumen, are studied. The aging resistance mechanism of different asphalt was discussed. This study provides a theoretical and scientific basis for the popularization and application of asphalt comprehensive modifier and further optimization research. It has important engineering application significance and certain theoretical reference value. In this paper, asphalt rotary film heating test and oven continuous heating test were used to simulate the short term aging and long term aging of asphalt respectively. The three general indexes and Brinell rotational viscosity of 26 kinds of asphalt before and after aging were tested. The aging property and aging law of different asphalt were analyzed and evaluated, and then the modification mechanism and anti-aging mechanism of ACM modified asphalt were discussed by fluorescence microscopic test and infrared spectrum analysis. Finally, the aging performance of ACM modified asphalt mixture was verified by road performance analysis before and after aging. The results show that the ACM4 modifier has the best anti-aging performance for modified 70# asphalt, followed by ACM2 and ACM3, and the worst one is ACM1.Compared with 70# asphalt, the other modified asphalt, except ACM1 modified 70# asphalt, have better anti-aging performance than 70# asphalt. However, the anti-aging property of SBS asphalt is not as good as that of ACM2 modifier for compound modified SBS asphalt. The aging property of the asphalt was the best, followed by ACM4 and ACM1, and the worst was ACM3. The anti-aging property of the SBS asphalt modified by ACM3 was better than that of SBS asphalt.) the more stable the microstructure of the asphalt was, the more dense the molecular distribution of modifier was, the more uniform the molecular distribution of modifier was. The better the anti-aging property of asphalt is, the greater the carbonyl index CI and the SI of sulfoxide group index are. The more serious the aging degree of asphalt is, the more serious the aging degree of asphalt is. The comprehensive aging index (CAI) is proposed to characterize the aging degree of asphalt. The equation of relationship between CAI and carbonyl index CI and sulfoxide index SI is established. The aging resistance of different asphalt can be evaluated by infrared spectrum test and the equation.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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