纤维对聚氨酯水泥复合材料的增韧作用

崔永曙¹，李晋^1*，熊大路²，卢忠梅²，张红光²

1.山东交通学院 交通土建工程学院，山东 济南  250357；2.济南金曰公路工程有限公司，山东 济南  250022

摘要：为研究纤维对聚氨酯水泥（polyurethane cement，PUC）复合材料的增韧性能及最佳养护龄期，对分别掺加碳纤维、聚乙烯醇纤维（polyvinyl alcohol fiber，PVA）、钢纤维等3种纤维，在不同养护龄期下制备的PUC复合材料进行抗弯强度试验，分析不同纤维在不同养护龄期下对PUC复合材料抗弯强度的提升规律。结果表明：纤维对PUC复合材料增韧性能的提升作用较明显，随掺加纤维体积比的增大，纤维对PUC复合材料的增韧效果呈先增大后减小的趋势，PUC复合材料的抗弯强度随养护龄期的增大而增大，养护龄期为14 d的PUC复合材料的抗弯强度为龄期为28 d材料的95%以上，龄期超过14 d后PUC复合材料的抗弯强度提升缓慢。分别掺加最佳体积比的碳纤维、PVA纤维、钢纤维，养护14 d时，PUC复合材料的抗弯强度较未掺加纤维分别提升了29.1%、54.5%、30.9%，纤维对PUC复合材料有明显的增韧作用。

关键词：纤维；PUC复合材料；增韧；龄期；抗弯强度

Toughening properties of polyurethane cement composites by fiber

CUI Yongshu¹, LI Jin^1*, XIONG Dalu², LU Zhongmei², ZHANG Hongguang²

1. School of Transportation and Civil Engineering, Shandong Jiaotong University, Jinan 250357, China;

2. Jinan Jinyue Highway Engineering Co., Ltd., Jinan 250022, China

Abstract:In order to study the toughening effect of fibers on polyurethane cement (PUC) composites and the optimum curing age, the flexural strength test of PUC composites with three kinds of fibers, including carbon fiber, PVA fiber and steel fiber, are carried out with different fiber volume fractions to analyze the law of improving the flexural strength of PUC composites at different curing ages. The results show that the fiber has a significant effect on the flexural strength of PUC composites. With the increase of fiber volume fraction, the toughening effect of fiber on PUC composites increases first and then decreases. The flexural strength of PUC composites increases with the increase of the curing age.The flexural strength of PUC composite with curing age of 14 d is more than 95 % of that of 28 d. After 14 d, the flexural strength increases slowly. The optimum volume fraction of carbon fiber, PVA fiber and steel fiber is added respectively. When cured for 14 days, the toughening effect of PUC composites is increased by 29.1 %, 54.5 % and 30.9 % respectively compared with that without fiber. The fiber has obvious toughening effect on PUC composites..

Keywords:fiber; PUC composite; toughening; age of hardening; bending strength