[1]张丽辉,刘建忠,阳知乾,等.不同截面形状PP纤维对砂浆抗塑性开裂的影响及机理[J].东南大学学报(自然科学版),2016,46(1):160-164.[doi:10.3969/j.issn.1001-0505.2016.01.026]
 Zhang Lihui,Liu Jianzhong,Yang Zhiqian,et al.Influences and mechanism of polypropylene fibers with different cross-sections on anti-plastic-cracking of cement mortar[J].Journal of Southeast University (Natural Science Edition),2016,46(1):160-164.[doi:10.3969/j.issn.1001-0505.2016.01.026]
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不同截面形状PP纤维对砂浆抗塑性开裂的影响及机理()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
46
期数:
2016年第1期
页码:
160-164
栏目:
材料科学与工程
出版日期:
2016-01-20

文章信息/Info

Title:
Influences and mechanism of polypropylene fibers with different cross-sections on anti-plastic-cracking of cement mortar
作者:
张丽辉刘建忠阳知乾徐德根李林
江苏省建筑科学研究院有限公司高性能土木工程材料国家重点实验室, 南京 210008; 江苏苏博特新材料股份有限公司, 南京 211103
Author(s):
Zhang Lihui Liu Jianzhong Yang Zhiqian Xu Degen Li Lin
State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co., Ltd., Nanjing 210008, China
Jiangsu Sobute New Materials Co., Ltd., Nanjing 211103, China
关键词:
聚丙烯纤维 截面形状 塑性开裂 砂浆
Keywords:
polypropylene fiber cross-section plastic cracking mortar
分类号:
TU528
DOI:
10.3969/j.issn.1001-0505.2016.01.026
摘要:
为了揭示不同截面形状聚丙烯(PP)纤维对砂浆抗塑性开裂的影响,采用平板约束法、荧光分析技术和扫描电子显微技术(SEM)分别对砂浆塑性开裂、纤维分散和纤维/基体界面形貌进行研究.结果表明:纤维长度、当量半径和掺量相同时,异形截面PP纤维提升砂浆塑性抗裂性能的效果优于圆形截面;将三角形和三叶形截面PP纤维与圆形截面PP纤维相比,前二者纤维的本体抗弯刚度提高幅度均大于20.88%,比表面积分别提高了28.6%和37.1%,纤维分散有效利用率分别提高了17.62%和30.70%,同时,纤维/基体间界面更致密,纤维表面粘附的水化产物更多.本体抗弯刚度、分散性、比表面积和纤维/基体界面黏结力的提高是异形截面PP纤维提高砂浆抗塑性开裂能力的关键因素.
Abstract:
In order to investigate the influences of polypropylene(PP)fibers with different cross-sections on anti-plastic-cracking of cement mortar, the restrained plat test, fluorescence spectrometer and scanning electron microscope were used to study the plastic cracking of cement mortar, fiber dispersion and fiber/matrix interface morphology, respectively. The results show that the cement mortar with profiled PP fiber possesses the better anti-plastic-cracking capacity than that with circular PP fiber when the length, equivalent radius and dosage are the same. Compared triangular and trefoil PP fibers with the circular PP fiber, the strengthened ratio of intrinsic flexural rigidity of the former two fibers is increased by more than 20.88%, the specific surface areas are increased by 28.6% and 37.1%, and the effective utilization percentages of fiber dispersion are improved by 17.62% and 30.70%, respectively. Furthermore, the fiber/matrix interface becomes more compact and more hydration products are adhesive to the fiber surface. The intrinsic flexural rigidity, fiber dispersion, specific surface area and fiber/matrix interface bond are the key factors for profiled PP fibers to improve the anti-plastic-cracking performance of the cement mortar.

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相似文献/References:

[1]钱春香,耿飞,李丽.聚丙烯纤维提高水泥砂浆抗塑性开裂的机理[J].东南大学学报(自然科学版),2005,35(5):786.[doi:10.3969/j.issn.1001-0505.2005.05.028]
 Qian Chunxiang,Geng Fei,Li Li.Mechanism research on improvement of resistance to plastic shrinkage and cracking of cement mortar by polypropylene fibers[J].Journal of Southeast University (Natural Science Edition),2005,35(1):786.[doi:10.3969/j.issn.1001-0505.2005.05.028]

备注/Memo

备注/Memo:
收稿日期: 2015-07-03.
作者简介: 张丽辉(1989—),女,助理工程师;刘建忠(联系人),男,博士,教授级高级工程师,ljz@cnjsjk.cn.
基金项目: 国家自然科学基金重点资助项目(51438003)、江苏省科技计划青年基金资助项目(BK20141012)、江苏省“六大人才高峰”资助项目(2013-JZ-003).
引用本文: 张丽辉,刘建忠,阳知乾,等.不同截面形状PP纤维对砂浆抗塑性开裂的影响及机理[J].东南大学学报(自然科学版),2016,46(1):160-164. DOI:10.3969/j.issn.1001-0505.2016.01.026.
更新日期/Last Update: 2016-01-20