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硅烷浸渍处理是混凝土常用的耐久性防护措施。使用异丁基三乙氧基硅烷浸渍处理水泥基材料,通过裂解-气相色谱-质谱(PGC-MS)表征浸渍于水泥基材料表面硅烷的特征结构与含量,发现其裂解碎片主要成分为异丁基;使用水蒸气等温脱吸附研究硅烷浸渍水泥基材料与水分相互作用特性,发现硅烷浸渍水泥基材料在低湿度区间的等温脱吸附性质没有显著变化,但浸渍处理有效抑制了相对湿度30%以上孔隙中水蒸气的凝聚和"墨水瓶效应",同时使60%以上相对湿度区间的脱吸附速率常数显著增大。硅烷浸渍水泥基材料经历实验室氙灯老化10周后硅烷含量并未明显降低,其水蒸气脱吸附特性也未明显改变。
Abstract：Silane impregnation is commonly used as a durability protection measure for concrete. Cement-based materials impregnated with triethoxyisobutylsilane were analyzed by pyrolysis-gas chromatography-mass spectrometry(PGC-MS) to identify the characteristic structure and amount of impregnation. The main component of the pyrolysis fragments is isobutyl. The water vapor sorption isotherm(WVSI) was determined to investigate the interaction between moisture and the impregnated materials. There is no notable difference at a humidity of <30%, the pore condensation(adsorption) and "ink-bottle" effect(desorption) substantially decrease, and the adsorption/desorption rate increases due to the impregnation at a humidity of>60%. The Xenon lamp ageing(10 weeks) after laboratory accelerated ageing process does not change the silane content and the WVSI characteristics.
[1]杜作栋.有机硅化学[M].北京:高等教育出版社, 1990:184-206.
[2] SELANDER A. Hydrophobic Impregnation of Concrete StructuresEffects on Concrete Properties[D]. Sweden:Royal Institute of Technology, 2010
[3]王学川,孙红尧,申明霞,等.混凝土用有机硅渗透剂耐紫外老化性能研究[J].水利水运工程学报, 2016(5):96-102.WANG Xuechuan, SUN Hongyao, SHEN Mingxia, et al. Hydro-Sci Eng(in Chinese), 2016(5):96-102.
[4] MORADLLO M K, SUDBRINK B, LEY M T. Determining the effective service life of silane treatments in concrete bridge decks[J].Constr Build Mater, 2016, 116(30):121-127.
[5] DE CLERCQ H, DE WITTE E. Reactivity of silicon based water repellent agents at different application conditions-Part I:reactivity of model compounds[J]. Bauinstandsetzen, 2001, 7(1):63-78.
[6] CLERCQH. Function of Silane Type on its Reactivity for Surface and In-Depth Applications to Different Substrates[C]. 5th International Conference on Water Repellent Treatment of Building Materials, 2008:17-30.
[7] HERB H, GERDES A, BRENNER-WEIβG. Characterization of silane-based hydrophobic admixtures in concrete using TOF-MS[J].Cem Concr Res, 2015, 70:77-82.
[8] MEDEIROS M,.HELENE P. Efficacy of Surface Hydrophobic Agents in Reducing Water and Chloride Ion Penetration in Concrete[J]. Mater Struct, 2008, 41(1):59-71.
[9]蒋正武,孙振平,王培铭.硅烷对海工高性能混凝土防腐蚀性能的影响[J].中国港湾建设, 2005(1):26-30.JIANG Zhengwu, SUN Zhenping, WANG Peiming. Chin Harbour En(in Chinese), 2005(1):26-30.
[10]陈旭. TEOS/异丁基三乙氧基硅烷复合乳液的制备及其对水泥基材料耐久性能的影响[D].山东:青岛理工大学, 2016CHEN Xu. Preparation of TEOS isobutyl triethoxysilane compound emulsion and its effect on the properties of cement based material durability(in Chinese, dissertation)[D]. Shandong:Qingdao University of Technology, 2016.
[11] ZHAN H, WITTMANN F H, ZHAO T. Relation between the Silicon Resin Profiles in Water Repellent Treated Concrete and the Effectiveness as a Chloride Barrier[J]. Restor Build Monum, 2005,11(1):35-46.
[12] DAI J, AKIRA Y, YOKOTA H, et al. Surface Impregnation of Pre-conditioned Concrete Subjected to Seawater Immersion Test[J].Restor Build Monum, 2007, 13(4):229-240.
[13] BRENNAN P, EVERETT E T. Light sources used in laboratory weathering of sealants and their effect on the correlation with natural weathering[R]. RILEM Publications SARL, 1999:155-172.
[14] HANSEN K K. Sorption Isotherms—A Catalogue[R]. Technical report162/86, Technical University of Denmark, 1986.
[15] BAROGHEL-BOUNY V. Water vapour sorption experiments on hardened cementitious materials Part I:Essential tool for analysis of hygral behaviour and its relation to pore structure[J]. Cem Concr Res,2007, 37:414-437.
[16]严继民,张启元,高敬琮.吸附与凝聚-固体的表面与孔[M].北京:科学出版社, 1986.
[17] ANDERSON R B. Modifications of the Brunauer, Emmett and Teller equation[J]. J Am Chem Soc, 1948, 68(5):1727.
[18] ZENG Q, ZHANG D, LI K. Kinetics and equilibrium isotherms of water vapor adsorption/desorption in cement-based porous materials[J].Transport in Porous Media, 2015, 109(2):1-25.
[19] ZENG Q, ZHANG D, HAO S, et al. Characterizing pore structure of cement blend pastes using water vapor sorption analysis[J]. Mater Charact, 2014, 95:72-84.
[20] HO Y. Review of second-order models for adsorption systems[J]. J Hazard Mater B, 2006, 136:681-689.
[21]郎比,拉贝克.聚合物的光降解、光氧化和光稳定[M].北京:科学出版社, 1986:103-109.
[22] PANESAR D K, FRANCIS J. Influence of limestone and slag on the pore structure of cement paste based on mercury intrusion porosimetry and water vapour sorption measurements[J]. Constr Build Mater, 2014,52:52-58.
[23] ALDERETE N, VILLAGRáN Y, MIGNON A, et al. Pore structure description of mortars containing ground granulated blast-furnace slag by mercury intrusion porosimetry and dynamic vapour sorption[J].Constr Build Mater, 2017, 145:157-165.
[24] WU M, JOHANNESSON B, GEIKER M. A study of the water vapor sorption isotherms of hardened cement pastes:Possible pore structure changes at low relative humidity and the impact of temperature on isotherms[J]. Cem Concr Res, 2014, 56:97-105.
[25] SNOECK D, VELASCO L F, MIGNON A, et al. The influence of different drying techniques on the water sorption properties of cement-based materials[J]. Cem Concr Res, 2014, 64:54-62.
基本信息:
DOI：10.14062/j.issn.0454-5648.2020.05.20190486
中图分类号:TU528
引用信息:
[1]景炜,杨睿,李克非.硅烷浸渍水泥基材料水蒸气脱吸附性能与有机物含量的表征[J].硅酸盐学报,2020,48(05):675-681.DOI:10.14062/j.issn.0454-5648.2020.05.20190486.
基金信息:
国家重点研发计划(2017YFB0309904);; 浙江省交通厅交通工程建设科研计划项目(2018035)
2020-03-06
2020-03-06
2020-03-06