工程科学学报，第38卷，第11期：1603-1609,2016年11月 Chinese Journal of Engineering,Vol.38,No.11:1603-1609,November 2016 D0l:10.13374/j.issn2095-9389.2016.11.014:http://journals.ustb.edu.cn 改性聚酯纤维在混凝土中的分散性及对耐久性的 影响 陈建强2)四，纪洪广”，刘娟红”，杨芳) 1)北京科技大学土木与环境工程学院，北京1000832)青岛理工大学土木工程学院，青岛266033 ☒通信作者，E-mail:hunter7750@sina.com 摘要制备了不同纤维摻量的改性聚酯纤维混凝土，通过纤维分散的图像处理方法研究五种不同搅拌方式对改性聚酯纤 维在混凝土中分散性能的影响，并通过耐久性试验研究改性聚酯纤维混凝土的抗碳化、抗氯盐侵蚀和抗冻性能.结果表明， 图像处理方法能够较好地评价改性聚酯纤维混凝土中的纤维分散性，认为“砂石胶材60s+水608+纤维60s”的搅拌方式得 到的纤维分散性最好，与肉眼观察的效果一致.摻加改性聚酯纤维能够提高混凝土的抗压强度，摻量为1.1kg·m3时提高强 度14%左右，继续增大纤维摻量不能持续提升强度.改性聚酯纤维在混凝土中的密集分布能够削弱C0,的扩散，降低混凝土 的碳化速率12.6%~18.9%，纤维摻量越多，抗碳化能力越好.摻加改性聚酯纤维能够降低混凝土的氯离子扩散系数，提高 其抗氯离子侵蚀能力.改性聚酯纤维还能有效减少冻融循环过程中表层材料的剥落，大大改善混凝土的抗冻性. 关键词纤维性混凝土：聚酯纤维：分散性：耐久性 分类号TU528 Dispersivity of modified polyester fibers in concrete and its influence on the durability of concrete CHEN Jian--qiang:2,JⅡHong-guang”',LIU Juan--hong,YANG Fang”' 1)School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China Corresponding author,E-mail:hunter7750@sina.com ABSTRACT Modified polyester fiber reinforced concrete with different additions was prepared.The dispersivity of modified polyes- ter fibers in concrete by five different mixing methods was studied by an image processing method.With a series of durability tests,the carbonation resistance,chloride penetration resistance and frost resistance of the fiber reinforced concrete were also investigated.The results indicate that the image processing method can evaluate the dispersivity of the fiber reinforced concrete well.The mixing method of "aggregate and binding materials for 60s water for 60s +fiber for 60s"makes the best dispersivity of modified polyester fibers.It is in accord with direct observations by naked eyes.The compressive strength is increased by the addition of modified polyester fibers. After adding 1.I kgmmodified polyester fibers,the compressive strength of concrete increases by 14%:but with more modified polyester fibers,the compressive strength no longer increases.The existence of modified polyester fibers in concrete can slow down the diffusion of CO2,the carbonation rate of concrete decreases by 12.6%to 18.9%,and with more modified polyester fibers,the carbonation resistance became better.After the addition of modified polyester fibers,the chloride diffusion coefficient of concrete also decreases.The modified polyester fibers can reduce the surface spalling of concrete during freeze-thaw cycles,which improves the frost resistance of concrete significantly. KEY WORDS fiber reinforced concrete:polyester fibers:dispersivity:durability 收稿日期：201604-19工程科学学报，第 38 卷，第 11 期: 1603--1609，2016 年 11 月 Chinese Journal of Engineering，Vol． 38，No． 11: 1603--1609，November 2016 DOI: 10． 13374 /j． issn2095--9389． 2016． 11． 014; http: / /journals． ustb． edu． cn 改性聚酯纤维在混凝土中的 分散性及对耐久性的 影响 陈建强1，2) ，纪洪广1) ，刘娟红1) ，杨 芳1) 1) 北京科技大学土木与环境工程学院，北京 100083 2) 青岛理工大学土木工程学院，青岛 266033  通信作者，E-mail: hunter7750@ sina． com 摘 要 制备了不同纤维掺量的改性聚酯纤维混凝土，通过纤维分散的图像处理方法研究五种不同搅拌方式对改性聚酯纤 维在混凝土中分散性能的影响，并通过耐久性试验研究改性聚酯纤维混凝土的抗碳化、抗氯盐侵蚀和抗冻性能． 结果表明， 图像处理方法能够较好地评价改性聚酯纤维混凝土中的纤维分散性，认为“砂石胶材 60 s + 水 60 s + 纤维 60 s”的搅拌方式得 到的纤维分散性最好，与肉眼观察的效果一致． 掺加改性聚酯纤维能够提高混凝土的抗压强度，掺量为 1. 1 kg·m － 3 时提高强 度 14% 左右，继续增大纤维掺量不能持续提升强度． 改性聚酯纤维在混凝土中的密集分布能够削弱 CO2的扩散，降低混凝土 的碳化速率 12. 6% ～ 18. 9% ，纤维掺量越多，抗碳化能力越好． 掺加改性聚酯纤维能够降低混凝土的氯离子扩散系数，提高 其抗氯离子侵蚀能力． 改性聚酯纤维还能有效减少冻融循环过程中表层材料的剥落，大大改善混凝土的抗冻性． 关键词 纤维性混凝土; 聚酯纤维; 分散性; 耐久性 分类号 TU528 收稿日期: 2016--04--19 Dispersivity of modified polyester fibers in concrete and its influence on the durability of concrete CHEN Jian-qiang1，2)  ，JI Hong-guang1) ，LIU Juan-hong1) ，YANG Fang1) 1) School of Civil and Environmental Engineering，University of Science and Technology Beijing，Beijing 100083，China 2) School of Civil Engineering，Qingdao University of Technology，Qingdao 266033，China  Corresponding author，E-mail: hunter7750@ sina． com ABSTＲACT Modified polyester fiber reinforced concrete with different additions was prepared． The dispersivity of modified polyes￾ter fibers in concrete by five different mixing methods was studied by an image processing method． With a series of durability tests，the carbonation resistance，chloride penetration resistance and frost resistance of the fiber reinforced concrete were also investigated． The results indicate that the image processing method can evaluate the dispersivity of the fiber reinforced concrete well． The mixing method of“aggregate and binding materials for 60 s + water for 60 s + fiber for 60 s”makes the best dispersivity of modified polyester fibers． It is in accord with direct observations by naked eyes． The compressive strength is increased by the addition of modified polyester fibers． After adding 1. 1 kg·m － 3 modified polyester fibers，the compressive strength of concrete increases by 14% ; but with more modified polyester fibers，the compressive strength no longer increases． The existence of modified polyester fibers in concrete can slow down the diffusion of CO2，the carbonation rate of concrete decreases by 12. 6% to 18. 9% ，and with more modified polyester fibers，the carbonation resistance became better． After the addition of modified polyester fibers，the chloride diffusion coefficient of concrete also decreases． The modified polyester fibers can reduce the surface spalling of concrete during freeze!thaw cycles，which improves the frost resistance of concrete significantly． KEY WOＲDS fiber reinforced concrete; polyester fibers; dispersivity; durability