摘要
针对内蒙古中西部地区风沙环境特征,利用模拟风沙环境侵蚀试验系统,研究了不同聚丙烯(PP)纤维掺量的PP纤维/水泥复合材料在风沙环境中的抗冲蚀性能,并利用SEM观测冲蚀后微观形貌,探究其冲蚀机制。结果表明:不同PP纤维掺量的PP纤维/水泥复合材料冲蚀率大小为:普通水泥砂浆>PP纤维质量比为1.5%的PP纤维/水泥复合材料>PP纤维质量比为0.5%的PP纤维/水泥复合材料(PP与胶凝材料的质量比),且在一定的冲蚀时间范围内,冲蚀损伤演化特征发生显著变化;不同PP纤维掺量的PP纤维/水泥复合材料冲蚀率随冲蚀角度的增加而增大,且在冲蚀角度为90°时出现不同的峰值,符合脆性材料特征;分析材料表面受粒子冲蚀过程的表面接触应力,结合冲蚀后微观形貌,表明适量PP纤维的掺入有助于提高PP纤维/水泥复合材料的密实程度,增加韧性,过量PP纤维的掺入会造成分散不均匀,降低砂浆密实度和抗冲蚀能力;通过合理匹配PP纤维掺量可制备出具有优异抗冲蚀性能的PP纤维/水泥复合材料。
According to the characteristics of the sand environment in the middle and west regions of Inner Mongolia,the erosion resistance of polypropylene(PP)fiber/cement composites with different PP fiber contents in the sand environment was studied by using the simulated wind sand environment erosion experimental system.The micro-morphology of PP fiber/cement composites after erosion was observed by using SEM,and the erosion mechanism was explored.The results show that the erosion rates of the PP fiber/cement composites with different PP fiber contents are as follows:Cement mortar PP fiber/cement composite with mass ratio of PP fiber to cementitious is1.5%PP fiber/cement composite with mass ratio of PP fiber to cementitious is 0.5%.Within a certain erosion time range,the evolution characteristics of erosion damage have changed significantly.The erosion rates of PP fiber/cement composites with different fiber contents increase with the erosion angle,and different peaks appear when the erosion angle is 90°,which accords with the characteristics of brittle materials.By analyzing the surface contact stress in erosion process and combined with the micro morphology after erosion,it is pointed out that the appropriate amount of PP fiber will improve the compactness and toughness of the PP fiber/cement composites.However,the addition of excessive PP fiber will cause uneven dispersion and reduce the compactness and erosion resistance of the mortar.The PP fiber/cement composites with excellent erosion resistance can be produced by matching the content of PP fiber reasonably.
作者
郝贠洪
刘艳晨
李永贵
高峰
HAO Yunhong;LIU Yanchen;LI Yonggui;GAO Feng(School of Science,Inner Mongolia University of Technology,Hohhot 010051,China;Fujian Key Laboratory of Novel Functional Textile Fibers and Materials,Minjiang University,Fuzhou 350108,China;The Inner Mongolia Key Laboratory of Civil Engineering Structure and Mechanics,Hohhot 010051,China;The Inner Mongolia Autonomous Region Construction Inspection and Appraisal and Safety Assessment Engineering Technology Research Center,Hohhot 010051,China;School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2021年第3期891-901,共11页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51468049)
福建省新型功能性纺织纤维及材料重点实验室(闽江学院)开放基金(FKLTFM1907)
内蒙古自治区博士研究生创新项目(B20191127Z)
内蒙古自治区自然科学基金面上项目(2018MS05047)。
关键词
水泥基复合材料
风沙环境
抗冲蚀
聚丙烯纤维
冲蚀机制
cement composite
sand environment
erosion resistance
polypropylene fiber
erosion mechanism
