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减缩剂对水泥石体积稳定性的影响及其机理

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Abstract:

针对水泥混凝土结构在服役期间经历干旱、降雨等自然现象的交替作用所产生的体积变化,选择在温度、湿度交变[35℃,相对湿度(relativehumidity)Rh=30%;20℃,Rh=100%]试验条件下评价减缩剂对水泥石体积稳定性的影响,并采用核磁共振和压汞仪分析其机理。结果表明减缩剂通过提高水泥石在温度、湿度交变环境的水化程度、增大水化硅酸钙凝胶的聚合程度,同时降低水泥石的可逆、不可逆收缩及最大长度变化,减小在严酷干燥条件的干缩值及潮湿环境的湿胀值,提高在恶劣自然环境保持较高体积稳定性的能力。

References

[1]  中国土木工程学会混凝土及预应力混凝土分会.钢筋混凝土结构裂缝控制指南[M].北京:化学工业出版社,2004:3-4.Concrete and Prestressed Concrete Institute.China Civil Engineering Society.Crack Control Guide of Reinforced Concrete Structures(in Chinese).Beijing:Chemical Industry Press,2004:3-4. [2]吴中伟,廉慧珍.高性能混凝土[M].北京:中国铁道出版社,1999:263-282.WU Zhongwei,LIAN Huizhen.High Performance Concrete(in Chi-nese),Beijing:China Railway Publishing House,1999:263-282. [3]Shrinkage mechanisms and durability[Z].(2004-03-20)[2009-08-03].http://www.hucc.hokudai.ac.jp/~m16120/coe/intensivecourse/wittmann2.pdf. [4]MEHTA P K,MONTEIRO J M Paulo.Concrete microstructure[J].Properties Mater,2001:47-48. [5]钱春香,耿飞,李丽.减缩剂的作用及其机理[J].功能材料,2006,2:287-291.QIAN Chunxiang,GENG Fei,LI Li.Funct Mater(in Chinese),2006,2:287-291. [6]BENTZ Dale P.Influence of shrinkage-reducing admixtures on early-age properties of cement paste[J].J Adv Concr Technol,2006,3:423-429. [7]HOVER Ken.Much ado about shrinkage[J].Concr Constr,2005,50:42-46. [8]KONSTANTIN Kovler,SEMION Zhutovsky.Overview and future trends of shrinkage research[J].Mater Struct,2006,39:827-847. [9]RIBEIRO A B,GONCALVES A,CARRAJOLA A.Effect of shrinkage reducing admixtures on the pore structure properties of mortars[J].Mater Struct,2006,2:179-187 [10]PEASE Bradley J.The Role of SRA on shrinkage stresss development and cracking[D].America:Purde University,2005. [11]HANSEN Will.Drying shrinkage mechanisms in portland cement paste[J].J Am Ceramic Soc,1987,70:323-328. [12]JUENGER Maria C Garci,JENNINGS Hamlin M.Examining therelationship between the microstructure of calcium silicate hydrate and drying shrinkage of cement paste[J].Cem Concr Res,2002,32:289-296. [13]THOMAS Jeffrey J,JENNINGS Hamlin M.Effect of heat treatment on the pore structure and drying shrinkage behavior of hydrated ce-ment paste[J].J Am Ceram Soc,2002,9:2293-2298. [14]RONCERO Joana,GETTE Ravindra,CARD Ignacio.Effect of chemical admixtures on the shrinkage of cement mortars[M/CD].Am Soc Civil Eng,1999,189:273-294.

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