干湿—冻融循环作用下沥青水老化的微观特性
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浙江大学

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U416.217

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Microscopic characteristics of asphalt water aging under the action of dry-wet-freeze-thaw cycles
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    摘要:

    本文为了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、温度、氧及水等因素的基础上,设计了室内“干湿-冻融”循环试验。以基质沥青和SBS改性沥青为研究对象,在薄膜烘箱短期老化的基础上,采用红外光谱(Fourier Transform Infrared spectroscopy,FTIR)与凝胶渗透色谱(Gel Permeation Chromatography,GPC)测试技术,定性、定量的分析在“干湿-冻融”循环作用下沥青特征官能团与分子量分布变化,探究沥青水老化的微观特性。试验结果表明: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改性沥青的羰基的氧老化特征峰在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;数均分子量、重均分子量、分散度及大粒径物质(the Large Molecule Size,LMS)含量均逐渐增大,可用亚砜基特征峰指数和LMS%的变化来定量表征沥青在“干湿-冻融”循环作用下的水老化程度。FTIR与GPC试验均表明,水环境中“干湿-冻融”循环作用将加剧沥青材料的老化程度;SBS改性沥青的抗水老化性能优于基质沥青的抗水老化性能。

    Abstract:

    In order to simulate the climatic characteristics of high temperature and high humidity in summer and micro-freeze-thaw in winter in Hangzhou of China, and to take into account factors such as cycle numbers, temperature, oxygen, water and other’s factors, this paper designed “Dry-Wet and Freeze-Thaw” (DW-FT) cycles test in laboratory. Base asphalt and styrene-butadiene-styrene (SBS) - modified asphalt were experimental specimens, basis on the thin film oven (TFOT) -aged of asphalts, the Fourier Transform Infrared spectroscopy (FTIR) and Gel permeation chromatography (GPC) test techniques were used to qualitatively and quantitatively analyze the characteristic functional groups and molecular weight distribution of asphalts before and after the “DW-FT” cycles test in order to study the water aging characteristics of asphalt. The experimental results indicated that, with the increase numbers of “DW-FT” cycle, the oxygen aging characteristic peaks of the carbonyl index changed little under the condition of mild-oxidation (60℃), and of the sulfoxide index increases obviously, the butadiene index of SBS asphalts decreases obviously in infrared spectra analysis; The number-average molecular, weight-average molecular weight,polydispersity and the large molecule size (LMS) content increased gradually with the increase numbers of “DW-FT” cycles in the GPC test. So the sulfoxide index and LMS% could be used to characterize the water aging degree of the asphalts. Both FTIR and GPC test results showed that the effect of the “DW-FT” cycles in water environment can accelerate the aging of asphalts materials, and the SBS modified asphalt had greater water ageing resistance than the base asphalts.

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  • 收稿日期:2019-03-26
  • 最后修改日期:2019-07-15
  • 录用日期:2019-07-31
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