基于遗传优化的乳化沥青冷再生混合料的疲劳性能及机理研究  

Study on Fatigue Performance and Mechanism of Emulsified Asphalt Cold Recycled Mixture Based on Genetic Optimization

作　　者：吕政桦 申爱琴[1] 李悦[1] 郭寅川[1] 喻沐阳 LYU Zhenghua;SHEN Aiqin;LI Yue;GUO Yinchuan;YU Muyang(School of Highway,Chang'an University,Xi'an 710064)

机构地区：[1]长安大学公路学院

出　　处：《材料导报》2019年第16期2704-2709,共6页Materials Reports

基　　金：陕西省自然科学基金(2017JQ5085);长安大学中央高校基本科研业务费专项资金(300102219713)~~

摘　　要：为了提高乳化沥青冷再生混合料疲劳性能评价及优化设计的精准性,通过正交试验设计,分析了不同应力比下水泥掺量、乳化沥青掺量及RAP掺量对混合料疲劳性能的影响规律。采用BP神经网络模型结合遗传算法对材料组成参数进行了优化,并建立了材料掺量与应力水平的相关关系。基于微观形貌测试及元素分析,揭示了冷再生混合料的耐疲劳抗裂机理。研究表明:不同应力比下各材料掺量对疲劳性能影响的显著性存在差异,高应力比下随各材料掺量的增大,混合料的疲劳性能均存在峰值;根据遗传优化结果推荐1.53%水泥掺量、3.56%乳化沥青掺量及78.31%RAP掺量作为最佳配比;在矿料-沥青界面开裂处,Ca/Si比高达78.84%,存在大量C 3S、C 2S等水化产物,界面强度显著提高。In order to improve the accuracy of fatigue performance evaluation and optimal design of emulsified asphalt cold recycled mixture,the effect of cement content,emulsified asphalt content and RAP content on fatigue performance of cold recycled mixture under various stress ratio were studied by orthogonal test design.Based on BP neural network model and genetic algorithm,materials parameter were optimized and the correlation between materials content and stress level was illustrated.Then the anti-cracking mechanism of cold recycled mixture was revealed according to SEM test and elemental analysis.The results showed that the significance of materials content influencing fatigue performance under various stress ratio was ranked differently,and the fatigue performance all existed a peak as materials content increased under high stress level.The proportion of 1.53%cement,3.56%emulsified asphalt and 78.31%RAP was recommend by genetic optimization results.Abundant hydration products like C 3S and C 2S were found positioning in the interfacial crack between asphalt and aggregate,where the content of Ca/Si was as high as 78.84%that enhanced the interfacial strength.

关 键 词：乳化沥青冷再生混合料 疲劳性能 遗传优化 材料掺量 抗裂机理 

分 类 号：U414[交通运输工程—道路与铁道工程]