化学改性芳纶纤维增强水泥基复合材料的性能

采用化学改性法对芳纶纤维进行表面处理, 研究了改性前后芳纶纤维对水泥基复合材料强度及抗冲击性能的影响。结果表明: 芳纶纤维的掺入可以提高水泥砂浆的抗折强度和抗冲击性能, 经化学改性后的芳纶纤维增强效果更加明显。当掺杂纤维的体积分数为1.0%时, 化学改性前后芳纶纤维增强水泥砂浆试样与基准砂浆试样相比, 其28天抗折强度分别提高了15.18%和23.85%, 抗冲击韧性分别提高了276.74%和294.54%。采用SEM对芳纶纤维表面微观形貌及试样断口形貌进行了观察, 利用XPS对改性前后芳纶纤维表面元素变化进行了研究, 探讨了芳纶纤维对水泥砂浆的增强机制。 

Performance of chemical modified Kevlar fiber reinforced cement-based composites

A chemical modification was adopted to treat the surface of Kevlar fibers. The influences of the Kevlar fiber on the strength and shock resistance of cement-based composites before and after chemical modification were studied. The results indicate that chemical modification can obviously strengthen the enhancement effect of Kevlar fibers on the flexural strength and shock resistance of the cement mortar. When the fiber volume ratio is 1.0%, the flexural strength of the cement mortar reinforced by Kevlar fiber before and after chemical modification is increased by 15.18% and 23.85%, respectively, and the toughness of shock resistance is increased by 276.74% and 294.54%, respectively, compared with the reference with no fiber. The micro-morphology of Kevlar fibers and the fracture morphology of the samples were observed by SEM, and the changes of the elements on the surface of Kevlar fibers before and after modification were studied with XPS. The mechanism of Kevlar fibers in improving mortar’s mechanical performance was discussed.