聚甲醛纤维增强砂浆塑性抗开裂性能的研究

关键字：聚,甲醛,纤维,增强,砂浆,塑性,抗,开裂,性能,

（1.高性能土木工程材料国家重点实验室，江苏 南京  210008；2.江苏苏博特新材料股份有限公司，江苏 南京  211103）
 

    摘要：采用平板约束法、荧光分析技术和单根纤维拔出试验，研究了聚甲醛（POM）、聚丙烯（PP）纤维对砂浆塑性抗开裂性能、纤维在砂浆中的分散性能和纤维-基体间界面粘结性能的影响。结果表明：当纤维种类、长度和掺量相同时，纤维增强砂浆强度等级越高，其塑性抗开裂能力越差；当砂浆强度等级、纤维长度和掺量相同时，POM纤维增强砂浆的塑性抗开裂性能优于PP纤维增强砂浆；与PP纤维相比，POM纤维在砂浆中的纤维分散系数、有效利用率和纤维/基体界面剪切强度分别提高了5.2%、7.1%和4.7%；与不掺POM纤维的基准砂浆相比，POM纤维（长度12 mm、掺量1.35 kg/m3）增强M30砂浆的塑性开裂初裂时间延长了56.8%，裂缝总面积和平均宽度分别减小了71.6%和67.3%。

    关键词：聚甲醛纤维；聚丙烯纤维；水泥砂浆；塑性抗开裂性能

    中图分类号：TU528.58        文献标识码：A        文章编号：1001-702X（2018）06-0048-05

 

Research on anti-plastic cracking property of polyoxymethylene fiber-reinforced cement mortar

ZHANG Lihui1，2，ZHOU Huaxin1，2，LIU Jianzhong1，2，YANG Zhiqian1，2，TIAN Kuozhan1，2

（1.State Key Laboratory of High Performance Civil Engineering Materials，Nanjing 210008，China；

2.Jiangsu Sobute New Materials Co. Ltd.，Nanjing 211103，China）

   Abstract：The plat restrained test，fluorescence spectrometry and single-fiber pull-out test are used to study the influences of polyoxymethylene（POM） fiber and polypropylene（PP） fiber on anti-plastic-cracking of cement mortar，fiber dispersion and fiber/matrix interfacial bond property，respectively. The results show that the higher strength grade the fiber reinforced cement mortar has，the lower anti-plastic cracking property it possesses when the fiber type，length and volume fraction are the same. POM fiber reinforced cement mortar contributes the better anti-plastic cracking property to the PP fiber reinforced cement mortar at the same strength grade of cement mortar，fiber length and dosage. As compared with PP fiber，the fiber distribution coefficient and effective utilization percentage in the cement mortar and the fiber/matrix interfacial bond shear strength of POM fiber are increased by 5.2%，7.1% and 4.7%，respectively. Compared to the control sample in the absence of POM fiber，the cement mortar with M30 strength grade in the presence of POM fiber with 12 mm length and 1.35 kg/m3 volume fraction has the growth of 56.8% in the first-cracking time and the decrease of 71.6% and 67.3% in the crack area and average width，respectively.

    Key words：polyoxymethylene fiber，polypropylene fiber，cement mortar，anti-plastic cracking property