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干湿冻融循环作用下沥青水老化的微观特性
Microscopic Characteristics of Asphalt Water Aging under the Action of Dry Wet and Freeze Thaw Cycles
投稿时间:2019-03-26  修订日期:2019-07-15
DOI:103969/j.issn.1007 9629202004026
中文关键词:  沥青  水老化  干湿冻融循环作用  微观特性
英文关键词:asphalt  water aging  dry wet and freeze thaw cycle  microscopic characteristic
基金项目:浙江省交通科技项目(2018QNA4023);宁波市交通运输委员会科技计划项目(2014191)
     
作者单位
张勤玲
ZHANG Qinling
浙江大学建筑工程学院,浙江杭州310058
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
黄志义
HUANG Zhiyi
浙江大学建筑工程学院,浙江杭州310058
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
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中文摘要:
      模拟杭州夏季高温高湿、冬季微冻融的气候特点,在综合考虑循环次数、热、氧及水等因素的基础上,设计室内干湿冻融循环试验,采用薄膜烘箱对基质沥青和SBS改性沥青进行短期老化,借助红外光谱(FTIR)与凝胶渗透色谱(GPC)分析了干湿冻融循环作用下沥青特征官能团和相对分子质量变化,探究沥青水老化的微观特性.结果表明:随着干湿冻融循环次数的增加,在热(60℃)氧化条件较为温和的情况下,基质沥青与SBS改性沥青中羰基的特征峰在FTIR图谱中变化较小,以至观测不到;亚砜基指数明显增大,丁二烯指数明显减小;数均相对分子质量、重均相对分子质量、分散度及大分子区(LMS)含量均逐渐增大.推荐采用亚砜基指数和LMS含量来定量表征沥青在干湿冻融循环作用下的水老化程度.FTIR与GPC试验均表明,在水环境中,干湿冻融循环作用将加剧沥青材料的老化;SBS改性沥青的抗水老化性能优于基质沥青.
英文摘要:
      Simulating the climate characteristics of high temperature and humidity in summer and micro freeze thaw in winter in Hangzhou, based on factors of cycle number and temperature, dry wet and freeze thaw(DW FT) cycling test in indoor was designed. Short term aging of neat asphalt and SBS modified asphalt was carried out by thin film oven test. Fourier transform infrared spectroscopy(FTIR) and gel permeation chromatography(GPC) were used to analyze the change of the characteristic functional groups and relative molecular mass distribution of asphalts under the action of the DW FT cycles in order to explore the water aging characteristics of asphalt. The results indicate that, with the increasing number of DW FT cycle, the oxygen aging characteristic peaks of the carbonyl index change little under the condition of mild oxidation(60℃), the sulfoxide index increases obviously, while the butadiene index of SBS asphalts decreases obviously. The number average and weight average relative molecular mass, polydispersity and the large molecule size(LMS) content increase gradually. So the sulfoxide index and LMS can be used to characterize the water aging degree of the asphalts. Both FTIR and GPC results show that the effect of the DW FT cycles in water environment can accelerate the water aging of asphalts, and the SBS modified asphalt has greater water aging resistance than the neat asphalt.
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