混凝土用聚乙烯醇纤维和聚丙烯纤维耐碱性能对比分析
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摘要
为了探究聚乙烯醇(PVA)纤维和聚丙烯(PP)纤维应用于混凝土中的稳定性,配制了不同浓度的NaOH溶液来模拟混凝土的碱性环境,同时采用加速腐蚀的方法对两种纤维进行碱溶液腐蚀处理,分别测试不同时间段两种纤维的直径和力学性能,并通过电镜观察纤维的表面变化情况。试验结果表明,随着浸泡时间的延长,两种纤维的直径都有所增加,强度都逐渐减小,但PP纤维的耐碱性能优于PVA纤维;碱溶液浓度越高,对纤维的腐蚀就越严重。微观形貌分析表明,相同条件下,PVA纤维比PP纤维受腐蚀更为严重。
In order to investigate the stability of polyvinyl alcohol fiber and polypropylene fiber used in concrete,different concentrations of NaOH solution were formulated to simulate the alkaline environment of the concrete, and both fibers were subjected to alkaline solution corrosion treatment by accelerated corrosion. The diameters and mechanical properties of the two fibers were tested at different time periods, and the surface changes of the fibers were observed by electron microscopy. The test results show that as the soaking time prolonged, the diameters of both fibers increased, and the strength decreased gradually. However, the alkali resistance of polypropylene fibers was superior to that of polyvinyl alcohol fibers the higher the concentration of the alkali solution was, the more serious the corrosion. Micromorphology analysis shows that under the same conditions, PVA fibers are more corrosive than PP fibers.
In order to investigate the stability of polyvinyl alcohol fiber and polypropylene fiber used in concrete,different concentrations of NaOH solution were formulated to simulate the alkaline environment of the concrete, and both fibers were subjected to alkaline solution corrosion treatment by accelerated corrosion. The diameters and mechanical properties of the two fibers were tested at different time periods, and the surface changes of the fibers were observed by electron microscopy. The test results show that as the soaking time prolonged, the diameters of both fibers increased, and the strength decreased gradually. However, the alkali resistance of polypropylene fibers was superior to that of polyvinyl alcohol fibers the higher the concentration of the alkali solution was, the more serious the corrosion. Micromorphology analysis shows that under the same conditions, PVA fibers are more corrosive than PP fibers.
引文
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[2]王晓飞.高强高性能混凝土配合比优化设计[D].西安:西安建筑科技大学,2012.
[3]蒋家奋,曹永康.展望21世纪混凝土科学技术[J].混凝土与水泥制品,2000(1):6-7.
[4]王海波.聚乙烯醇纤维(维纶)增强砂浆性能的研究[D].北京:北京工业大学,2003.
[5]杨雯雯.纤维混凝土力学性能及耐久性能试验研究[D].济南:山东大学,2012.
[6]陈润锋,张国防,顾国芳.我国合成纤维混凝土研究与应用现状[J].建筑材料学报,2001(2):167-173.
[7]曹诚,刘兰强.关于聚丙烯纤维对混凝土性能影响的几点认识[J].混凝土,2000(9):49-51.
[8]邓宗才,李建辉,刘国栋.混杂粗纤维增强混凝土力学特性试验研究[J].混凝土,2006(8):50-55.
[9]沈荣熹,崔琪,李清海.新型纤维增强水泥基复合材料[M]北京:中国建材工业出版社,2004.
[10]马佳晨,张炉青,张学旭,等.改性水泥基材料用聚乙烯醇纤维耐碱性能研究[J].中国粉体技术,2015,21(2):61-63.
[11]高鹏锟,胡微微,赵党锋,等.聚丙烯、玄武岩纤维和耐碱玻璃纤维耐碱性能对比分析[J].天津纺织科技,2011(1):19-21,24.
[12]刘光云.改性聚丙烯纤维提高混凝土性能的作用机理[J]安徽建筑,2005(1):99-100.
[13]孟志良,吴仲兵,钱觉时.大掺量粉煤灰混凝土的孔隙液相碱度[J].重庆建筑大学学报,1999,21(1):27-28.
[14]刘森,李发学,俞建勇,等.Richcel纤维的耐碱性能研究[J]纺织科学研究,2004(2):12-15,44.
[15]Chae D.W.,Choi K.R.,Kim B.C.,et al.Effect of Cellulose Pulp on the Mercerizing Behavior and Physical Properties of Lyocell Fibers[J].Textile Res.J,2003,73(6):541-545.
[16]詹怀宇.纤维素化学与物理[M].北京:科学出版社,2005.
[17]郑明霞,李来庆,郑明月,等.碱处理对玉米秸秆纤维素结构的影响[J].环境科学与技术,2012,35(6):27-31.
[18]鲁杰,石淑兰,杨汝男,等.纤维素酶酶解苇浆纤维微观结构和结晶结构的变化[J].中国造纸学报,2005,20(2):85-90.
[19]何艳峰,李秀金,方文杰,等.NaOH固态预处理对稻草中纤维素结构特性的影响[J].可再生能源,2007,25(5):31-34.
[20]王晓刚,毛新奇,赵铁军.聚乙烯醇纤维水泥基复合材料[J].青岛建筑工程学院学报,2004(4):28-31.
[21]赵波,龙跃,张良进,等.高炉渣纤维耐碱性及其对混凝土性能的影响[J].硅酸盐通报,2016,35(4):1240-1244.
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