电阻率法研究引气剂对水泥浆体化学收缩及氯离子渗透性的影响
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摘要
研究了引气剂对硅酸盐水泥浆体的电阻率、化学收缩、物理力学性能及氯离子渗透性的影响。结果表明,掺入引气剂使水泥浆体的流动度增大,凝结时间延长,早期水化速率加快,化学收缩增大。水泥浆体的电阻率在凝结前随着引气剂掺量的增加而增大,在硬化后则随着掺量的增加而减小。在28d龄期时,0.04%掺量内的引气剂对硬化浆体的抗压强度影响较小,其强度损失率低于5%,氯离子迁移系数随掺量的增大而减小。随引气剂掺量的变化,水泥浆体的电阻率与化学收缩、抗压强度和氯离子迁移系数均存在很好的定量关系。通过水泥浆体的电阻率发展曲线可以预测其化学收缩、强度与氯离子渗透性的变化规律。
The evolution of electrical resistivity,chemical shrinkage,physical and mechanical properties and chloride permeability of the Portland cement pastes with air entraining agent were studied.The results show that the air entraining agent is added to increase the fluidity of the cement pastes and prolong the setting time,the early hydration rate and chemical shrinkage increases.With the increase of dosage of air entraining agent,the electrical resistivity of the cement pastes increases before setting and decreases after hardened.At 28 d,the dosages of air entraining agent have a little effect on the compressive strength of the hardened pastes within 0.04%,and its loss rate is less than 5%,the chloride diffusion coefficient decreases as its dosage increases.With the change of the dosage of air entraining agent,the electrical resistivity of cement pastes has a good quantitative relationship with chemical shrinkage,compressive strength and chloride diffusion coefficient.The variation of the chemical shrinkage,strength and chloride permeability can be predicted by the electrical resistivity development curve of the cement pastes.
The evolution of electrical resistivity,chemical shrinkage,physical and mechanical properties and chloride permeability of the Portland cement pastes with air entraining agent were studied.The results show that the air entraining agent is added to increase the fluidity of the cement pastes and prolong the setting time,the early hydration rate and chemical shrinkage increases.With the increase of dosage of air entraining agent,the electrical resistivity of the cement pastes increases before setting and decreases after hardened.At 28 d,the dosages of air entraining agent have a little effect on the compressive strength of the hardened pastes within 0.04%,and its loss rate is less than 5%,the chloride diffusion coefficient decreases as its dosage increases.With the change of the dosage of air entraining agent,the electrical resistivity of cement pastes has a good quantitative relationship with chemical shrinkage,compressive strength and chloride diffusion coefficient.The variation of the chemical shrinkage,strength and chloride permeability can be predicted by the electrical resistivity development curve of the cement pastes.
引文
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[17] Yue Xingguo,Wang Peiming,Zhu Yongchao.Effect of air entraining agent on performance of EVB thermal insulation mortars with different mass ratio of aggregate to cement[J].New Building Materials,2009,36(11):8-11(in Chinese).岳兴国,王培铭,朱永超.引气剂对不同集灰比玻化微珠保温砂浆性能的影响[J].新型建筑材料,2009,36(11):8-11.
[18] Gu Xinyun,Lu Xinying.Preliminary study on connectivity of pores in particle assembly generated by PFC3D[J].Concrete,2009(5):11-14(in Chinese).顾馨允,路新瀛.PFC3D模拟颗粒堆积体的孔隙连通性初步研究[J].混凝土,2009(5):11-14.
[19] He Zongxu,Shi Caijun,Hu Xiang,et al.Development on migration characteristic and interactions of chloride ion in cement-based materials under applied voltages[J].Journal of the Chinese Ceramic Society,2015,43(8):1111-1119(in Chinese).何宗旭,史才军,胡翔,等.外加电压下氯离子在水泥基材料中的迁移特性及相互作用的研究进展[J].硅酸盐学报,2015,43(8):1111-1119.
[2] Wong H S,Pappas A M,Zimmerman R W,et al.Effect of entrained air voids on the microstructure and mass transport properties of concrete[J].Cement and Concrete Research,2011,41(10):1067-1077.
[3] Wang Fanggang,Lu Jiayue,Xu Wen.Study on preparation and properties of high-speed railway CRTSⅢslab ballastless track self-compacting concrete[J].China Concrete and Cement Products,2018(7):42-46(in Chinese).王方刚,陆加越,徐文.高速铁路CRTSⅢ型板式无砟轨道自密实混凝土制备与性能研究[J].混凝土与水泥制品,2018(7):42-46.
[4] Ma B,Wang H.Rheological properties of self-compacting concrete paste containing chemical admixtures[J].Journal of Wuhan University of Technology(Materials Science Edition),2013,28(2):291-297.
[5] Zhang Jinxi,Guo Mingyang,Yang Rongjun,et al.Effect of air-entraining admixtures on the structure and properties of hardened concrete[J].Journal of Wuhan University of Technology,2008,30(5):38-41(in Chinese).张金喜,郭明洋,杨荣俊,等.引气剂对硬化混凝土结构和性能的影响[J].武汉理工大学学报,2008,30(5):38-41.
[6] Zeng Xiaohui,Ling Chenbo,Pan Zhang,et al.Influence of capillary water absorption on resistivity of cement mortar[J].Journal of Building Materials,2018,http://kns.cnki.net/kcms/detail/31.1764.TU.20180103.1257.004.html(in Chinese).曾晓辉,凌晨博,潘璋,等.毛细吸水作用对水泥砂浆电阻率的影响研究[J].建筑材料学报,2018.http://kns.cnki.net/kcms/detail/31.1764.TU.20180103.1257.004.html.
[7] Wan Huiwen,Yang Shuyan,Lv Yanfeng.Resistance to chloride ion penetration and properties of pore structure in air-entraining concrete[J].Journal of Building Materials,2008,11(4):409-413(in Chinese).万惠文,杨淑雁,吕艳锋.引气混凝土抗氯离子渗透性与孔结构特性[J].建筑材料学报,2008,11(4):409-413.
[8] Mccarter W J,Chrisp T M,Starrs G,et al.Characterizationof physio chemical processes and hydration kinetics in concretes containing supplementary cementitious materials using electrical property measurements[J].Cement and Concrete Research,2013,50(7):26-33.
[9] ASTM C1608-17.Test method for chemical shrinkage of hydraulic cement paste[S].ASTM International,West Conshohocken,2017.
[10] Zhang Chi,Yuan Xiaolu,Zhou Shihua.Effect of mineral admixtures and superplasticizer on rheological performance of cement based materials[J].Concrete,2004(09):43-46(in Chinese).张驰,袁晓露,周世华.矿物掺合料与高效减水剂对水泥基材料流变性能的影响[J].混凝土,2004(09):43-46.
[11] Zuo Yibing,Wei Xiaosheng.Relations among electrical resistivity,chemical shrinkage and autogenous shrinkage of fly ash cement pastes[J].Journal of Chongqing University,2015,38(4):45-54(in Chinese).左义兵,魏小胜.粉煤灰水泥浆体的电阻率与化学收缩及自收缩的相互关系[J].重庆大学学报,2015,38(4):45-54.
[12] Sui Tongbo,Zeng Xiaohui,Xie Youjun,et al.Early age cement hydration behavior by resistivity[J].Journal of the Chinese Ceramic Society,2008,36(4):11-15(in Chinese).隋同波,曾晓辉,谢友均,等.电阻率法研究水泥早期行为[J].硅酸盐学报,2008,36(4):11-15.
[13] Tian Kai,Wei Xiaosheng.Electrical characteristic of cement paste and its relationship with compressive strength[J].Journal of Building Materials,2007,10(6):682-686(in Chinese).田凯,魏小胜.水泥净浆电性能及其与抗压强度的关系[J].建筑材料学报,2007,10(6):682-686.
[14] Zhou Wenfang,Chen Yu.Review of chemical shrinkage and self-shrinkage of cement-based materials[J].Journal of China and Foreign Highway,2013,33(4):300-303(in Chinese).周文芳,陈瑜.水泥基材料化学收缩和自收缩研究综述[J].中外公路,2013,33(4):300-303.
[15] Zhang J,Qin L,Li Z.Hydration monitoring of cementbased materials with resistivity and ultrasonic methods[J].Materials and Structures,2009,42(1):15-24.
[16] Liao Yishun,Wei Xiaosheng.Chemical shrinkage and electrical resistivity of cement at early age[J].Journal of Huazhong University of Science and Technology(Natural Science Edition),2012,40(8):29-33(in Chinese).廖宜顺,魏小胜.早龄期水泥浆体的化学收缩与电阻率研究[J].华中科技大学学报(自然科学版),2012,40(8):29-33.
[17] Yue Xingguo,Wang Peiming,Zhu Yongchao.Effect of air entraining agent on performance of EVB thermal insulation mortars with different mass ratio of aggregate to cement[J].New Building Materials,2009,36(11):8-11(in Chinese).岳兴国,王培铭,朱永超.引气剂对不同集灰比玻化微珠保温砂浆性能的影响[J].新型建筑材料,2009,36(11):8-11.
[18] Gu Xinyun,Lu Xinying.Preliminary study on connectivity of pores in particle assembly generated by PFC3D[J].Concrete,2009(5):11-14(in Chinese).顾馨允,路新瀛.PFC3D模拟颗粒堆积体的孔隙连通性初步研究[J].混凝土,2009(5):11-14.
[19] He Zongxu,Shi Caijun,Hu Xiang,et al.Development on migration characteristic and interactions of chloride ion in cement-based materials under applied voltages[J].Journal of the Chinese Ceramic Society,2015,43(8):1111-1119(in Chinese).何宗旭,史才军,胡翔,等.外加电压下氯离子在水泥基材料中的迁移特性及相互作用的研究进展[J].硅酸盐学报,2015,43(8):1111-1119.