基于分子动力学的泡沫沥青混合料水损害研究  

Research on water damage of foamed asphalt compound based on molecular dynamics

作　　者：胡涛 HU Tao(Hunan Construction Engineering Communications Construction Co.,Ltd.,Changsha 410004,Hunan,China)

机构地区：[1]湖南建工交通建设有限公司,湖南长沙410004

出　　处：《工程建设》2023年第7期13-18,共6页Engineering Construction

摘　　要：泡沫温拌沥青混合料对降低公路建设养护过程中的碳排放以及实现国家“双碳”目标具有显著的应用价值,但泡沫温拌沥青发泡效果不理想,混合料的水稳定性难以保证,会使得黏附性能下降,从而出现水损害。为此,本文基于分子动力学方法,通过使用Materials Studio软件对泡沫温拌沥青黏附性能损耗进行模拟研究。结果表明:静电能随着含水量的增加而增加,而范德华能在不同含水量的沥青分子中呈现出小范围波动,沥青分子含水量对范德华能影响不明显;在黏附能方面,随着含水量的增加,泡沫沥青与骨料二氧化硅的黏附能呈下降的趋势。泡沫沥青分子内部由于含有残余水导致泡沫沥青与集料的黏附性能降低。本文研究成果可为泡沫温拌沥青的水稳定性计算提供一定的借鉴与参考。WAM Foam mixture has significant application value for reducing carbon emissions in the process of highway construction and maintenance and achieving the national"double carbon"goal,but the foaming effect of WAM Foam is not ideal,and the water stability of the compound is difficult to guarantee,which will reduce the adhesion performance and cause water damage.Therefore,based on molecular dynamics methods,Materials Studio software is used to simulate and research the adhesion performance loss of WAM Foam.The results show that the electrostatic energy increases with the increase of water content,while Van der Waals shows a small range of fluctuations in bitumen molecules with different water content,and the water content of asphalt molecules has no obvious effect on Van der Waals energy.In terms of adhesion energy,with the increase of water content,the adhesion energy of foamed asphalt and aggregate silica shows a downward trend.The adhesion between foamed asphalt and aggregates is reduced due to the residual water contained in the foamed asphalt molecules.The results can provide a certain reference for the calculation of water stability of WAM Foam.

关 键 词：水损害 泡沫温拌沥青 二氧化硅集料 分子动力学 

分 类 号：U414[交通运输工程—道路与铁道工程]