不同引气剂对离子导电砂浆孔隙率及导电性能的影响研究
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摘要
离子导电砂浆的导电性能取决于内部电解质溶液的分布情况,而孔隙率是影响电解质溶液渗透的关键因素。采用了两种化学引气剂:铝粉和双氧水;两种常用物理引气剂:SJ-2和K12,并在不同水灰比条件下制备了离子导电砂浆试件35组,系统考察了引气剂和水灰比对离子导电砂浆孔隙率、电阻率和微观形貌的影响。结果表明,掺入引气剂和改变水灰比均能提高试件孔隙率。单掺时铝粉引气效果最佳,但其存在最优水灰比,而复掺能在单掺基础上进一步提高试件孔隙率。复掺铝粉和SJ-2引气剂,且水灰比为0.7时,孔隙率达到25.31%,渗透完全时电阻率可达到4.042Ω·m,为最优组合。
The electrical conductivity of the ionically conductive mortar depends on the distribution of the internal electrolyte solution,and the porosity is the key factor affecting the penetration of the electrolyte solution.35 groups of ionically conductive mortar specimens were manufactured with two chemical air entraining agents,aluminum powder and hydrogen peroxide.Two common physical air entraining agents,SJ-2 and K12,and the specimens were made by different water cement ratio.The influence of air-entraining agent and water-cement ratio on the porosity,resistivity and microstructure of ionically conductive mortar were investigated.The results show that the porosity of the specimen can be improved by adding air entraining agent,and changing water cement ratio.The specimens made by aluminum powder and particular water cement ratio have the biggest porosity compared to other specimens with single air-entraining agent.The porosity of the specimens with two different air entraining agents can be further improved.According to the results,the specimens with aluminum powder and SJ-2(water cement ratio is 0.7)have optimal porosity,25.31%.Resistivity of the specimens are only 4.042 Ω·m.
The electrical conductivity of the ionically conductive mortar depends on the distribution of the internal electrolyte solution,and the porosity is the key factor affecting the penetration of the electrolyte solution.35 groups of ionically conductive mortar specimens were manufactured with two chemical air entraining agents,aluminum powder and hydrogen peroxide.Two common physical air entraining agents,SJ-2 and K12,and the specimens were made by different water cement ratio.The influence of air-entraining agent and water-cement ratio on the porosity,resistivity and microstructure of ionically conductive mortar were investigated.The results show that the porosity of the specimen can be improved by adding air entraining agent,and changing water cement ratio.The specimens made by aluminum powder and particular water cement ratio have the biggest porosity compared to other specimens with single air-entraining agent.The porosity of the specimens with two different air entraining agents can be further improved.According to the results,the specimens with aluminum powder and SJ-2(water cement ratio is 0.7)have optimal porosity,25.31%.Resistivity of the specimens are only 4.042 Ω·m.
引文
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[19]李文刚,刘乐平.导电混凝土研究现状[J].油气田地面工程,2006,25(7):47-47.
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[21]李相国,刘敏,马保国,等.孔结构对泡沫混凝土性能的影响与控制技术[J].材料导报,2012,26(7):141-144.
[2]赵若红,区浩文,傅继阳,等.掺工业废弃料导电砂浆电阻率稳定性研究[J].材料导报,2015(12):129-134.
[3]范道波,赵若红,徐安,等.离子导电砂浆导电性能研究[J].混凝土,2016(5):117-121.
[4]FORDE M C,MCCARTER J,WHITTINGTON H W.The conduction of electricity through concrete[J].Magazine of Concrete Research,2015,33(114):48-60.
[5]MAGALH魨ES A G,SILVA F J,REZENDE M A P,et al.The Influence of the water/cement ratio in the open porosity and in the carbonation front advancing in cementitious matrix composites[J].Applied Mechanics&Materials,2017(864):313-317.
[6]ZHANG F,WANG H,WANG Q.Study on effects of mineral admixture and air-entraining agent on the pore structure and performance of concrete[J].Journal of Hydroelectric Engineering,2010.
[7]朱洪波,王培铭,张继东.一种新型加气混凝土发气材料[J].建筑材料学报,2011,14(2):160-163.
[8]朱蓓蓉,杨全兵,吴学礼,等.SJ-2新型引气剂及其引气混凝土性能[J].混凝土,2001(4):21-24.
[9]符惠玲,仲以林,张健,等.不同引气剂在聚羧酸减水剂复配中的应用研究[C]/“/科隆杯”混凝土外加剂征文---分会第十三次会员代表大会论文集.江门,2012:241-245.
[10]水泥胶砂强度检验方法(ISO法):GB/T 17671-1999[S].北京:中国标准出版社,1999:68-80.
[11]吴笑梅,樊粤明.蒸养轻骨料-粉煤灰加气混凝土砌块结构与性能[J].华南理工大学学报(自然科学版),2003,31(9):57-61.
[12]董越,杨志强,高谦,等.MATLAB孔隙特征对铁尾矿加气混凝土性能的影响[J].建筑材料学报,2017,20(1):42-48.
[13]KEARS;EY E P,WAINWRIGHT P J.Porosity and permeability of foamed concrete[J].Cement&Concrete Research,2001,31(5):805-812.
[14]叶铭勋,HOOTON R D.水泥石孔隙率测定方法的研究[J].水利水运工程学报,1991(1):63-73.
[15]曾文波,孙振平,水亮亮,等.混凝土引气剂的作用机理及性能评价方法[J].混凝土世界,2015(11):84-87.
[16]吴方政,王利锋,单俊鸿.混凝土引气剂的研究现状[C]//第五届(2011)国际路面养护技术论坛论文集.厦门,2011:316-319.
[17]胡皞,贾兴文.催化剂在双氧水发泡超轻泡沫混凝土中的应用研究[J].建筑砌块与砌块建筑,2015(5):41-44.
[18]周冬冬,廖洪强,宋慧平,等.试验参数对固废基发泡混凝土试块性能的影响研究[J].硅酸盐通报,2017,36(7):2459-2466.
[19]李文刚,刘乐平.导电混凝土研究现状[J].油气田地面工程,2006,25(7):47-47.
[20]ILLSTON J M,NYAME B K.Relationships between permeability and pore structure of hardened cement paste[J].Magazine of Concrete Research,1981,33(116):139-146.
[21]李相国,刘敏,马保国,等.孔结构对泡沫混凝土性能的影响与控制技术[J].材料导报,2012,26(7):141-144.
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