混杂粗/细聚丙烯纤维混凝土力学及抗氯离子渗透性能研究
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摘要
基于试验研究了不同混凝土强度等级(C20、C30、C40、C50)、不同聚丙烯纤维掺量、聚丙烯掺杂方式(单掺长度6mm细纤维、单掺长度9mm细纤维、长度6mm与长度9mm细纤维2∶1混掺、长度6mm细纤维与长度35mm粗纤维1∶6混掺)下、纤维混凝土的劈裂强度和氯离子扩散系数,比较各种因素对混凝土强度及抗氯离子渗透性能的影响,分析了其影响机理.结果表明:相对于不同长度的聚丙烯细纤维,混掺聚丙烯粗细纤维混杂混凝土劈裂受拉时,可有效利用细纤维对微裂缝的抑制作用和粗纤维对宏观裂缝的桥接作用,抑制微观及宏观裂缝的发展,可显著提高混凝土的劈拉强度;同时可缓解细细纤维混掺时存在的分散性较差的问题,抗氯离子渗透性能良好.
This paper mainly studied the impact of three factors,four levels on the splitting tensile strength,compressive strength and resistance to chloride ion properties of concrete based on the tests.The four types of factor levels are the strength grade of concrete(C20,C30,C40,C50),polypropylene(PP)fiber content,fiber doping method(only with 6 mm-length PP micro-fiber,only with 9 mm-length PP micro-fiber,6 mm-length PP micro-fiber mixed with 9 mm-length PP micro-fiber in proportion to 2∶1,6 mm-length PP micro-fiber mixed with 35 mm-length PP macro-fiber in proportion to 1∶6).The influence of various factors on the strength and resistance against chlorine peneration of concrete is compared and the mechanism of the phenomon is analyzed.The results show that compared with the doping method of one length kind of PP micro-fiber mixed with another length kind of PP micro-fiber,the method of mixing PP macro-fiber with PP micro-fiber can not only improve the resistance against chlorine peneration,but can also significantly improve the compressive strength and splitting strength of concrete.The blending of PP macro-fiber with PP micro-fiber can effectively utilize the inhibition of fine fiber on micro cracks and the bridging effect of coarse fibers,thus inhibiting the development of micro and macro cracks.Its durability is also greater.At the same time,it can alleviate the problem of poor dispersion of micro-fiber,and has higher resistance to chloride ion permeation.
This paper mainly studied the impact of three factors,four levels on the splitting tensile strength,compressive strength and resistance to chloride ion properties of concrete based on the tests.The four types of factor levels are the strength grade of concrete(C20,C30,C40,C50),polypropylene(PP)fiber content,fiber doping method(only with 6 mm-length PP micro-fiber,only with 9 mm-length PP micro-fiber,6 mm-length PP micro-fiber mixed with 9 mm-length PP micro-fiber in proportion to 2∶1,6 mm-length PP micro-fiber mixed with 35 mm-length PP macro-fiber in proportion to 1∶6).The influence of various factors on the strength and resistance against chlorine peneration of concrete is compared and the mechanism of the phenomon is analyzed.The results show that compared with the doping method of one length kind of PP micro-fiber mixed with another length kind of PP micro-fiber,the method of mixing PP macro-fiber with PP micro-fiber can not only improve the resistance against chlorine peneration,but can also significantly improve the compressive strength and splitting strength of concrete.The blending of PP macro-fiber with PP micro-fiber can effectively utilize the inhibition of fine fiber on micro cracks and the bridging effect of coarse fibers,thus inhibiting the development of micro and macro cracks.Its durability is also greater.At the same time,it can alleviate the problem of poor dispersion of micro-fiber,and has higher resistance to chloride ion permeation.
引文
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[2]戴建国,黄承逵.网状聚丙烯纤维混凝土的试验研究[J].混凝土与水泥制品,1999,(4):35-38.Dai Jianguo,Huang Chengkui.Experimental research on net-typed polypropylene fibers reinforced concrete[J].Concrete and Cement Products,1999,(4):35-38.
[3]王瑞兴,钱春香,丁庆领,等.聚丙烯纤维对混凝土性能的改善研究[J].混凝土与水泥制品,2004,(1):41-43.Wang Ruixing,Qian Chunxiang,Ding Qingling,et al.Polypropylene fiber improvements to concrete performance[J].Concrete and Cement Products,2004,(1):41-43.
[4]朱超,刘远,杨健.聚丙烯纤维对粉煤灰混凝土耐久性的影响[J].湖南城市学院学报(自然科学版),2014,23(1):6-9.Zhu Chao,Liu Yuan,Yang Jian.Influences of polypropylene fiber on the durability of fly ash concrete[J].Journal of Hunan City University(Natural Science),2014,23(1):6-9.
[5]刘竞,邓德华,黄波,等.聚丙烯纤维高性能混凝土用于海洋浪溅区的研究与应用[J].施工技术,2008,37(4):93-96.Liu Jing,Deng Dehua,Huang Bo,et al.Research and application of polypropylene fiber reinforced high performance concrete in marine tidal zone[J].Construction Technology,2008,37(4):93-96.
[6]姜健,朱巍.聚丙烯纤维对自密实再生混凝土抗渗性能的影响[J].粉煤灰综合利用,2014,(5):26-29.Jiang Jian,Zhu Wei.Impact on impermeability of selfcompacting recycled concrete[J].Fly Ash Comprehensive Utilization,2014,(5):26-29.
[7]李光伟.聚丙烯纤维对混凝土抗裂性能的影响[J].水电站设计,2002,18(2):98-100.Li Guangwei.Effect of polypropylene fiber on concrete cracking resistance[J].Design of Hydro-electric Power Station,2002,18(2):98-100.
[8]吴刚,李希龙,史丽华,等.聚丙烯纤维混凝土抗渗性能的研究[J].混凝土,2010,(7):95-97.Wu Gang,Li Xilong,Shi Lihua,et al.Study on PPfiber in waterproof concrete[J].Concrete,2010,(7):95-97.
[9]岳秀杰.废弃纤维再生混凝土抗侵蚀性能研究[D].沈阳:沈阳建筑大学,2013.Yue Xiujie.Exprimental research on waste fiber and recycled concrete erosion resistance performance[D].Shenyang:Shenyang Construction University,2013.
[10]梁霆浩,李淋露,张裕清,等.聚丙烯腈纤维海工混凝土抗裂性能的试验研究[J].混凝土,2010,(11):43-46.Liang Tinghao,Li Linlu,Zhang Yuqing,et al.Research on anti-cracking ability of polyacrylonitrile fiber reinforced marine concrete[J].Concrete,2010,(11):43-46.
[11]刘湘杰.聚丙烯纤维混凝土氯离子渗透性研究[D].武汉:武汉大学,2014.Liu Xiangjie.Study on chloride permeability of polypropylene fiber concrete[D].Wuhan:Wuhan University,2014.
[12]丁威,韦庆东.《纤维混凝土应用技术规程》JGJ/T221-2010简介[J].施工技术,2011,40(7):101-103.Ding Wei,Wei Qingdong.Introduction of Technical Specification for Fiber Concrete Application JGJ/T221-2010[J].Construction Technology,2011,40(7):101-103.
[13]Odd E Gjrv,赵铁军.严酷环境下混凝土结构的耐久性设计[M].北京:中国建材工业出版社,2015.Odd E Gjrv,Zhao Tiejun.Durability Design of Concrete Structures in Severe Environments[M].Beijing:China Building Materials Industry Press,2015.