Liao Weibin, Wu Peizong, Huang Jiatao, Chen Gai, Lin Jiaxiang, Guo Yongchang, Chen Runsheng
School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Materials (Basel). 2023 Jul 23;16(14):5172. doi: 10.3390/ma16145172.
Currently, oil-coated PVA fibers are the most commonly used material in ECC research. However, the high price limits the application of PVA-ECC in practical engineering. In order to reduce the cost, one of the methods is to partially replace the PVA fibers in ECC. In order to demonstrate the feasibility of PVA/BF-ECC and PVA/PP-ECC, polyvinyl alcohol fibers (PVA), basalt fibers (BFs) and polypropylene fibers (PP) were added at 0.5%, 1.0% and 1.5% by volume of PVA in addition to 1% by volume of PVA. Subsequently, tensile, compression and drop-weight impact tests were conducted on single or hybrid fiber concrete. The results showed that the post-peak compression toughness, tensile strength, and initial cracking impact strength of PVA/BF-ECC and PVA/PP-ECC increased significantly with the increase in the volume ratio of BF and PP fibers, while the performance of PVA-ECC materials with the same fiber volume ratio decreased slightly. Therefore, the cost can be reduced by designing hybrid PVA/BF-ECC materials that meet the performance requirements. The experimental evidence presented in this study demonstrates the feasibility and reasonable prospect of the new hybrid PVA/BF-ECC.
目前，涂油聚乙烯醇（PVA）纤维是工程水泥基复合材料（ECC）研究中最常用的材料。然而，其高昂的价格限制了PVA-ECC在实际工程中的应用。为了降低成本，方法之一是在ECC中部分替代PVA纤维。为了证明聚乙烯醇/玄武岩纤维增强水泥基复合材料（PVA/BF-ECC）和聚乙烯醇/聚丙烯纤维增强水泥基复合材料（PVA/PP-ECC）的可行性，除了1%体积分数的PVA纤维外，还分别按PVA体积分数的0.5%、1.0%和1.5%添加了聚乙烯醇（PVA）纤维、玄武岩纤维（BF）和聚丙烯纤维（PP）。随后，对单纤维或混杂纤维混凝土进行了拉伸、压缩和落锤冲击试验。结果表明，PVA/BF-ECC和PVA/PP-ECC的峰值后抗压韧性、抗拉强度和初裂冲击强度随BF和PP纤维体积比的增加而显著提高，而相同纤维体积比的PVA-ECC材料性能略有下降。因此，通过设计满足性能要求的混杂PVA/BF-ECC材料可以降低成本。本研究给出的实验证据证明了新型混杂PVA/BF-ECC的可行性和合理前景。
