基于室内环境模拟的再生沥青混合料老化影响因素

发布时间：2018-05-14 01:40

本文选题：道路工程 + 沥青老化　；参考：《北京工业大学学报》2017年04期

【摘要】：为了解决不同环境因素对路面工程中未经压实的再生沥青混合料(recycled asphalt mixture,RAP)老化程度影响的问题,以松散的再生沥青混合料为研究对象,利用特制的室内模拟老化试验装置,通过控制温度、湿度、老化时间、氧气浓度等因素,对新制备密级配沥青混合料AC-13进行特定环境条件下模拟老化试验.结果表明:松散RAP混合料的老化程度随试验温度升高而增加,随空气湿度增加和氧气浓度下降而降低;不同试验温度下,沥青老化的成长速度和试验终值均不相同,表明老化过程中的化学反应因温度不同而有所差异;在通入纯氮气的试验中,沥青没有发生任何老化作用,表明沥青的老化只受氧化作用影响;环球法测软化点的试验结果对温度变化较为敏感,动态剪切流变仪(dynamic shear rheometer,DSR)测定的动态复数剪切模量在表征沥青老化程度时存在一定迟滞效应;老化后沥青混合料低温性能出现衰减,主要原因是沥青长期老化作用导致.
[Abstract]:In order to solve the problem of the influence of different environmental factors on the aging degree of uncompacted recycled asphalt mixture in pavement engineering, the loose recycled asphalt mixture is taken as the research object, and the special indoor simulation aging test device is used. By controlling the temperature, humidity, aging time, oxygen concentration and other factors, simulated aging test of newly prepared dense gradation asphalt mixture (AC-13) was carried out under specific environmental conditions. The results show that the aging degree of loose RAP mixture increases with the increase of test temperature and decreases with the increase of air humidity and the decrease of oxygen concentration. The results show that the chemical reaction in the aging process varies with different temperatures, and that the aging of asphalt is affected only by oxidation. The test results of softening point measured by universal method are sensitive to the temperature change. The dynamic complex shear modulus measured by dynamic shear rheometer has a hysteresis effect in characterizing the aging degree of asphalt. After aging, the low-temperature performance of asphalt mixture attenuates, mainly due to the long-term aging of asphalt.
【作者单位】：长安大学公路学院;
【基金】：交通运输部建设科技资助项目(2013318J08220) 河北省交通运输厅科技计划资助项目(Y-201302007)
【分类号】：U414

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