聚合物基水泥柔性复合材料在腐蚀环境下的剪切力学性能  

Shear Mechanical Properties of Polymer-based Cement Flexible Composites in Corrosive Environment

作　　者：宁镱彭 许金余[1] 王志航 黄河[1] NING Yi-peng;XU Jin-yu;WANG Zhi-hang;HUANG He(Air Force Engineering University,Xi'an Shaanxi 710038,China)

机构地区：[1]空军工程大学,陕西西安710038

出　　处：《公路交通科技》2022年第3期30-36,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51208507,51378497)。

摘　　要：针对机场道面填缝料易腐蚀破坏的问题,研制出一种新型聚合物基水泥柔性复合材料(PCFC)。考虑到材料在工作环境下容易遭受酸、碱和航油腐蚀,研究了酸溶液、碱溶液和航油侵蚀对PCFC的剪切力学性能的影响规律,对不同侵蚀时间的PCFC进行了剪切力学性能试验。结合扫描电镜试验和压汞测孔试验,分析了酸溶液、碱溶液和航油侵蚀对PCFC对微观形貌及孔结构的影响机理。结果表明:PCFC在酸和碱溶液侵蚀下仍具有良好的工作性能,PCFC试件的剪切强度、剪切变形性能、剪切能耗性能随着酸溶液、碱溶液、航油侵蚀时间的增长分别有着不同程度的削弱,其中经航油侵蚀后试件的剪切性能降幅最大,航油侵蚀30 d后其剪切强度、剪切峰值应变、剪切韧度分别降低68%,64.8%和87.4%,而酸和碱溶液侵蚀30 d后其剪切强度仅分别降低19.9%和15.8%,剪切韧度分别下降39.4%和34.5%,剪切峰值应变却分别提高13.9%和13.8%;酸、碱、航油侵蚀会导致PCFC的孔隙量和孔径尺寸增加,进一步验证了酸、碱溶液、航油能够引起聚合物分子溶胀软化,致使聚合物分子链断裂,使得复合材料具有低伸展度的剪切性能;在实际腐蚀环境应用中,PCFC维持其剪切性能的能力明显优于传统填缝料,具备良好的使用性能和广阔的应用前景。In view of the problem of easy corrosion and damage of airport pavement joint filler, a new PCFC is developed. Considering that the material is easy to be corroded by acid, alkali and jet fuel in the working environment, the influences of acid solution, alkali solution and jet fuel on the shear mechanical properties of PCFC are studied, and the shear mechanical performance of PCFC with different erosion time is tested. Combining with scanning electron microscope test and mercury injection pore test, the influence mechanism of acid solution, alkali solution and jet fuel erosion on the micro morphology and pore structure of PCFC is analyzed. The result shows that(1) PCFC still has good working performance under acid and alkali solution erosion, the shear strength, shear deformation performance of shear energy consumption performance, of PCFC specimens are weakened to different degrees with the increase of acid solution, alkali solution and jet fuel erosion time. Among them, the shear performance of the specimens is reduced the most after jet fuel erosion. After 30 days of jet fuel erosion, the shear strength, peak shear strain and shear toughness decreased by 68%, 64.8%, and 87.4% respectively. While after 30 days of acid and alkali solution erosion, the shear strength decreased by only 19.9% and 15.8%, the shear toughness decreased by 39.4% and 34.5%, and the peak shear strain increased by 13.9% and 13.8% respectively.(2) The erosion of acid, alkali and jet fuel will increase the pore volume and pore size of PCFC. It is further verified that acid, alkali solution and jet fuel can cause the swelling and softening of polymer molecules, cause the fracture of polymer molecular chain, and make the composites have the shear properties of low elongation.(3) In actual corrosive environment applications, the ability of PCFC to maintain its shear performance is significantly better than that of traditional joint fillers, with good performance and broad application prospect.

关 键 词：道路工程 聚合物基水泥柔性复合材料 腐蚀环境 剪切强度 剪切能耗性能 剪切变形性能 

分 类 号：TU528[建筑科学—建筑技术科学]