在寒冷地区，冬季路面极易出现积雪结冰现象，常使用融雪盐对路面进行融雪除冰，融雪盐的使用会对沥青混合料产生侵蚀。沥青砂浆作为沥青混凝土材料的重要组成部分，在力学性能方面发挥了极其重要的作用。对 SBS 改性沥青盐冻循环前后的三大指标(针入度、软化点和延度)进行了测试，对经历不同盐冻循环的沥青砂浆试件进行单轴压缩蠕变实验，并通过扫描电镜(SEM)研究其微观结构的变化。结果表明，冻融循环和荷载应力会造成沥青砂浆力学性能的下降，因此在昼夜温差较大的北方寒冷地区的冬季应尽量限制重载车辆的通行量以及融雪盐的用量，以减少对路面结构的损坏。
De-icing salt was often used when the road was covered by snow and ice in cold area,which would cause erosion to asphalt mixture.Asphalt mortar,as an important part of asphalt pavement materials,plays an extremely important role in the mechanical properties of asphalt concrete.The three routine indicators (penetra-tion,softening point and ductility)of the SBS modified asphalt was tested before and after the salt freezing.U-niaxial compression creep test of SBS modified asphalt mortar specimens were conducted after different salt freezing cycles.And the SEM (scanning electron microscope)was used to observe the microstructure of SBS modified asphalt mortar.The analysis results showed that the freeze-thaw cycle and load stress would cause the loss of mechanical properties of SBS modified asphalt mortar.So It is necessary to restrict traffic and overloa-ding and the use of de-icing salt in cold area,in order to reduce the damage of pavement structure.
参考文献
| [1] | Wu Zhao .Impact of freeze-thaw cycles on the perform-ance of asphalt mixture[D].Wuhan:Wuhan University of Technology,2011. |
| [2] | 谭忆秋,孙嵘蓉,郭猛,钟勇,周水文.蓄盐沥青混合料除冰雪性能研究[J].中国公路学报,2013(01):23-29. |
| [3] | Yanping Wang;Jiaofeng Ye;Yanhua Liu;Xiaohu Qiang;Libang Feng .Influence of freeze-thaw cycles on properties of asphalt-modified epoxy repair materials[J].Construction and Building Materials,2013(Apr.):580-585. |
| [4] | Behnam Amini;Saleh Sharif Tehrani .Simultaneous effects of salted water and water flow on asphalt concrete pavement deterioration under freeze-thaw cycles[J].The international journal of pavement engineering,2014(5/6):383-391. |
| [5] | Deshpande V S;Cebon D.Steady-state constitutive rela-tionship for idealized asphalt mixtures[J].Mechanics of Materials,1999(31):271-287. |
| [6] | Huang Baotao;Tian Weiping.Method of mixture ratio de-sign for long-term use asphalt mortar[J].Highway,2008(4):148-151. |
| [7] | Xiong Jianping;Shen Aiqin;Pan Zaiye.Experimental study for salt freezing resistance of road cement concrete[J].Highway,2010(2):152-159. |
| [8] | Xu Fu;Cao Zheng;Dong Huiqing.New method to calculate the relationship between asphalt thickness and optimal asphalt content[J].East China Highway,2006(6):83-87. |
| [9] | Liu Zhenzheng .Research on the performance change of asphalt under the salt freezing circulation[D].Hohhot:Inner Mongolia University of Technology,2013. |
| [10] | 潘宝峰,王哲人,陈静云.沥青混合料抗冻融循环性能的试验研究[J].中国公路学报,2003(02):1-4. |
| [11] | Feng Lin .The research on the static and dynamic creep model of asphalt mixture under uniaxial pressure[D].Changsha:Changsha University of Science &Technolo-gy,2008. |
| [12] | Ye Yong;Yang Xinhua;Chen Chuanyao .Viscoelas-toplastic constitutive model for creep deformation behav-ior of asphalt sand[J].Journal of Central South Univer-sity of Technology,2008,15(1):13-16. |
| [13] | 崔亚楠,邢永明,张淑艳.废橡胶粉改性沥青的低温性能试验研究[J].新型建筑材料,2010(12):70-72,87. |
| [14] | Li Chao;Han Jiwei;Liu Zhenzheng et al.Research on the performance of modified asphalt under the salt freez-ing cycle[J].Journal of Inner Mongolia Polytechnic Uni-versity of Technology,2014,33(1):56-61. |
| [15] | 赵延庆,陈静云.应力状态对沥青混合料黏弹性质的影响[J].建筑材料学报,2009(04):428-432. |
| [16] | Wu Jun;Yang Xinhua;Bai Fan .A micromechanical frame-work with aggregate-mastic interface effect for predicting u-niaxial compression creep of asphalt mixture[J].Acta Me-chanica Solida Sinica,2014,27(3):306-314. |
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