碳纤维水泥基材料导电性与压敏性的试验研究
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摘要
首先用正交试验研究了分散剂、消泡剂和水灰比对碳纤维水泥浆扩展度和水泥石导电性的影响,而后研究了碳纤维长度对水泥石导电性的影响,最后研究了复合6mm长碳纤维水泥石的压敏性.结果表明:碳纤维水泥石配合比决定了纤维和水泥粒子的分散性,也最终决定了材料的导电性;碳纤维长度越长、掺量越大,对水泥石导电性的改善效果越好,6 mm长碳纤维的渗流临界体积率在0.278%左右,而3 mm长碳纤维的渗流临界体积率在0.54%左右;一次压载至破坏前,复合有0.18%到0.5%碳纤维的水泥石的电阻率具有17%到35%左右的线性降低趋势,且处于渗流区的变化率大于处于过渗流区的情况.
The influences of dispersing agent,water cement ratio and antifoaming agent on the flow ability and the electrical resistance of carbon fiber reinforced cement(CFRC) were studied by orthogonal test.The pressure-sensitivity of CFRC mixed with 6mm carbon fiber and the influence of carbon fiber length on the conductance of CFRC were discussed.The results show that electrical conductance of CFRC depends on the mixing proportion of CFRC because it has an important effect on the dispersion of cement particles and fiber.The more and longer the fibers are the more obvious improvement to electrical conductance they make.For 6mm carbon fiber,the percent of vadose critical volume of cement is 0.34%,and 0.66% for 3mm carbon fiber.During once loading,the electrical resistance of CFRC mixed with 0.18% to 0.5% carbon fiber possesses 17% to 35% linear reduction with the higher changing ratio in the vadose zone than in the over-vadose zone.
The influences of dispersing agent,water cement ratio and antifoaming agent on the flow ability and the electrical resistance of carbon fiber reinforced cement(CFRC) were studied by orthogonal test.The pressure-sensitivity of CFRC mixed with 6mm carbon fiber and the influence of carbon fiber length on the conductance of CFRC were discussed.The results show that electrical conductance of CFRC depends on the mixing proportion of CFRC because it has an important effect on the dispersion of cement particles and fiber.The more and longer the fibers are the more obvious improvement to electrical conductance they make.For 6mm carbon fiber,the percent of vadose critical volume of cement is 0.34%,and 0.66% for 3mm carbon fiber.During once loading,the electrical resistance of CFRC mixed with 0.18% to 0.5% carbon fiber possesses 17% to 35% linear reduction with the higher changing ratio in the vadose zone than in the over-vadose zone.
引文
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[9]姚武,陈兵,吴科如.碳纤维水泥基材料的机敏特性研究[J].复合材料学报,2002,19(2):49-53.
[10]熊传溪,闻荻江.聚合物基导电复合材料的导电机理[J].玻璃钢/复合材料,1998,9(5):36-38.
[11]谢泉,罗姣莲.碳黑填充型导电硅橡胶的导电机理研究及电阻率计算[J].长沙交通学院学报,2000,16(3):4-7.
[12]MARK WEBER,MUSA R,KAMAL.Estim ation ofthe volum e resistivity of electrically conductive com-posites[J].Polym er Composites,1997,18(6):711-725.
[2]关新春,欧进萍.土木工程智能结构体系的研究与发展[J].地震工程与工程振动,1999,19(2):21-28.
[3]WANG S,SHUI X,FU X,et al.Early fatigue dam agein carbon-fiber composites observed by electrical re-sistance m easurem ent[J].Journal of M aterials Sc i-ence,1998,33(12):3875-3884.
[4]韩宝国.碳纤维水泥基复合材料压敏性能的研究[D].哈尔滨:哈尔滨工业大学,2001.
[5]CHUNG D D L.Cem ent re inforced w ith short carbonfibers:a mu ltifunctionalm aterial[J].Composites PartB:Engineering,2000,31(6-7):511-526.
[6]CHUNG D D L.Cem ent-based E lectron ics[J].Jour-nal of E lectroceram ics,2001,6(1):75-88.
[7]段曦东,唐绍裘,谢有赞,等.碳/陶复合导电陶瓷的研究[J].功能材料,1997,28(2):319-323.
[8]SEUNG B.P,LEE I.M echan ical properties and ap-p lications of carbon-fiber-re inforced cem ent com-posites[J].H igh Temperatures-H igh Pressures,1990,(22):663-670.
[9]姚武,陈兵,吴科如.碳纤维水泥基材料的机敏特性研究[J].复合材料学报,2002,19(2):49-53.
[10]熊传溪,闻荻江.聚合物基导电复合材料的导电机理[J].玻璃钢/复合材料,1998,9(5):36-38.
[11]谢泉,罗姣莲.碳黑填充型导电硅橡胶的导电机理研究及电阻率计算[J].长沙交通学院学报,2000,16(3):4-7.
[12]MARK WEBER,MUSA R,KAMAL.Estim ation ofthe volum e resistivity of electrically conductive com-posites[J].Polym er Composites,1997,18(6):711-725.
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