Niu Xiangjie, Chen Yuanzhao, Li Zhenxia, Guo Tengteng, Ren Meng, Chen Yanyan
School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450045, China.
Technology Innovation Center of Henan Transport Industry of Utilization of Solid Waste Resources in Traffic Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China.
Polymers (Basel). 2023 Dec 21;16(1):41. doi: 10.3390/polym16010041.
In order to improve the mechanical properties and durability of cement-based materials, a certain amount of multi-walled carbon nanotubes (MWCNTs) and polypropylene fiber (PP fiber) were incorporated into cement-based materials. The mechanical properties of the multi-walled carbon nanotubes/polypropylene fiber cement-based materials were evaluated using flexural strength tests, compressive strength tests, and splitting tensile tests. The effects of multi-walled carbon nanotubes and polypropylene fiber on the durability of cement-based materials were studied using drying shrinkage tests and freeze-thaw cycle tests. The effects of the multi-walled carbon nanotubes and polypropylene fibers on the microstructure and pore structure of the cement-based materials were compared and analyzed using scanning electron microscopy and mercury intrusion tests. The results showed that the mechanical properties and durability of cement-based materials can be significantly improved when the content of multi-walled carbon nanotubes is 0.1-0.15%. The compressive strength can be increased by 9.5% and the mass loss rate is reduced by 27.9%. Polypropylene fiber has little effect on the compressive strength of the cement-based materials, but it significantly enhances the toughness of the cement-based materials. When its content is 0.2-0.3%, it has the best effect on improving the mechanical properties and durability of the cement-based materials. The flexural strength is increased by 19.1%, and the dry shrinkage rate and water loss rate are reduced by 14.3% and 16.1%, respectively. The three-dimensional network structure formed by the polypropylene fiber in the composite material plays a role in toughening and cracking resistance, but it has a certain negative impact on the pore structure of the composite material. The incorporation of multi-walled carbon nanotubes can improve the bonding performance of the polypropylene fiber and cement matrix, make up for the internal defects caused by the polypropylene fiber, and reduce the number of harmful holes and multiple harmful holes so that the cement-based composite material not only has a significant increase in toughness but also has a denser internal structure.
为了提高水泥基材料的力学性能和耐久性，将一定量的多壁碳纳米管（MWCNTs）和聚丙烯纤维（PP纤维）掺入水泥基材料中。采用抗折强度试验、抗压强度试验和劈裂抗拉试验对多壁碳纳米管/聚丙烯纤维水泥基材料的力学性能进行了评价。通过干燥收缩试验和冻融循环试验研究了多壁碳纳米管和聚丙烯纤维对水泥基材料耐久性的影响。利用扫描电子显微镜和压汞试验对多壁碳纳米管和聚丙烯纤维对水泥基材料微观结构和孔结构的影响进行了比较和分析。结果表明，当多壁碳纳米管含量为0.1 - 0.15%时，水泥基材料的力学性能和耐久性可得到显著提高。抗压强度可提高9.5%，质量损失率降低27.9%。聚丙烯纤维对水泥基材料的抗压强度影响较小，但能显著提高水泥基材料的韧性。当其含量为0.2 - 0.3%时，对改善水泥基材料的力学性能和耐久性效果最佳。抗折强度提高19.1%，干缩率和失水率分别降低14.3%和16.1%。复合材料中聚丙烯纤维形成的三维网络结构起到增韧和抗裂作用，但对复合材料的孔结构有一定负面影响。多壁碳纳米管的掺入可以提高聚丙烯纤维与水泥基体的粘结性能，弥补聚丙烯纤维造成的内部缺陷，减少有害孔和多重有害孔的数量，使水泥基复合材料不仅韧性显著提高，而且内部结构更加致密。
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