沥青性能综合分析与优选方法研究

发布时间：2018-05-16 16:24

本文选题：沥青 + 气候　；参考：《长安大学》2015年硕士论文

【摘要】：沥青胶结料选用不当会直接导致沥青路面早期病害的产生,这些病害直接影响到沥青路面的耐久性和安全性,所以,选择优质沥青是解决沥青路面早期病害的关键。我国幅员辽阔,气候条件比较复杂,不同等级道路交通荷载状况差异也较大,加之,国内沥青市场上沥青品牌繁多,当面对多种都满足规范要求的沥青时,优选沥青工作就比较困难。因此,研究基于气候、交通条件及沥青性能的定量优选方法具有十分重要的意义。提出沥青优选方法的总体思路,即通过选择沥青优选评价要素、评价要素评价指标选择、评价指标的评分取值及沥青优选评价要素权重的确定,计算沥青性能综合指数;选择的优选评价要素是高温性能、低温性能、感温性能、抗老化性能;提出利用各气候分区内高温、低温、温差、影响沥青老化气候条件的相对重要程度,确定对应的沥青优选评价要素的权重,并且对重载交通条件下优选要素权重进行调整的思路。对不同类型沥青的感温性能、高温性能、低温性能、抗老化性能进行综合分析与评价,得出以下结论:1、推荐采用PI对沥青感温性能进行评价;2、推荐采用软化点对沥青感温性能进行评价;3、采用低温等级温度TLC能够对同一低温等级沥青的低温性能进行区分,在沥青优选时,推荐采用低温延度对沥青低温性能进行评价;4、采用短期老化残余延度、残余针入度比作为沥青优选抗老化性能评价指标。借助DSC、GPC、FTIR对不同类型沥青的微观结构进行测试,结合沥青的聚集态和分子量能够对沥青路用性能的优劣进行解释,利用红外光谱图能够解释沥青老化的机理,并且能够从定量分析角度区分不同沥青的抗老化性能。结合多种沥青技术指标数据统计分析,建立70#、90#基质沥青、SBS I-C改性沥青评分取值依据,对70#、90#基质沥青、SBS I-C改性沥青技术指标评分;对各气候分区内高温、低温、温差、影响沥青老化的气候条件的等级进行划分,借助层次分析法的比较矩阵,确定沥青高温、低温、感温、抗老化性能的权重,并且对重载交通条件下各项路用性能的权重进行适当的调整;通过沥青综合性能指数计算公式,计算七种品牌70#、90#基质沥青、SBS I-C改性沥青的综合性能指数,利用综合性能指数的排序结果,为部分气候分区推荐了综合性能突出的沥青。
[Abstract]:Improper selection of bituminous binder will directly lead to the emergence of early diseases of asphalt pavement, which directly affect the durability and safety of asphalt pavement. Therefore, the selection of high quality asphalt is the key to solve the early disease of asphalt pavement. China has a vast territory, complex climatic conditions, and great differences in traffic loads on different grades of roads. In addition, there are many asphalt brands in the domestic asphalt market, so when many kinds of asphalt meet the requirements of the specifications, It is difficult to select asphalt. Therefore, it is of great significance to study the quantitative selection method based on climate, traffic conditions and asphalt performance. The general idea of asphalt optimal selection method is put forward, that is, the comprehensive index of asphalt performance is calculated by selecting the evaluation elements of asphalt optimal selection, selecting the evaluation index of evaluation elements, selecting the score of evaluation indexes and determining the weight of asphalt optimal selection evaluation elements. The optimum selection and evaluation factors are high temperature performance, low temperature performance, temperature sensing performance, aging resistance, and the relative importance of using high temperature, low temperature and temperature difference in each climate zone to influence the aging climate conditions of asphalt is put forward. The weight of the corresponding asphalt optimal selection evaluation elements is determined, and the train of thought of adjusting the weight of the optimal selection elements under heavy traffic conditions is given. The temperature sensing, high temperature, low temperature and aging resistance of different kinds of asphalt were analyzed and evaluated. The following conclusions are drawn: 1. Pi is recommended to evaluate the temperature sensing performance of asphalt, and softening point is recommended to evaluate the temperature sensing performance of asphalt. The low temperature grade temperature TLC can distinguish the low temperature performance of asphalt with the same low temperature grade. It is recommended that the low temperature ductility be used to evaluate the low temperature performance of asphalt, and the short term aging residual ductility and the residual penetration ratio should be used as the evaluation indexes of asphalt excellent selection and anti aging performance. The microstructure of different types of asphalt was tested by means of DSC-GPC-FTIR, and the performance of asphalt was explained by the aggregation state and molecular weight of asphalt. The mechanism of asphalt aging could be explained by infrared spectroscopy. And it can distinguish the aging resistance of different asphalt from the angle of quantitative analysis. Based on the statistical analysis of technical index data of several kinds of asphalt, the paper establishes the evaluation basis of SBS I-C modified asphalt of 70 #yun90# matrix asphalt, marks the technical index of SBS I-C modified asphalt of 70 #yun90# matrix asphalt, and points out the high temperature, low temperature and temperature difference in each climate zone. With the help of the comparison matrix of analytic hierarchy process (AHP), the weight of asphalt's high temperature, low temperature, temperature sensing and aging resistance is determined. The weight of each road performance under heavy traffic condition is adjusted properly, and the comprehensive performance index of SBS I-C modified asphalt is calculated by calculating the formula of asphalt comprehensive performance index. Based on the ranking results of comprehensive performance index, asphalt with outstanding comprehensive performance is recommended for some climatic zones.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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