聚丙烯纤维增强水泥复合材料抗冲蚀性能及冲蚀机制

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...

Erosion resistance and erosion mechanism of polypropylene fiber reinforced cement composite

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 is 1.5% 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.