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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第9卷    第3期    总第47期    2012年6月

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文章编号:1672-7029( 2012) 03-0008-05
蒸汽养护对高速铁路轨道板混凝土渗透性的影响
赵健1,谭盐宾2,3,李化建2,3,谢永江2,3,易忠来2,3

(1.西南交通大学土木工程学院,四川成都610031; 2.中国铁道科学研究院北京100081;
3.高速铁路轨道技术国家重点实验室北京100081
)

摘 要: 为探明蒸汽养护对采用水泥-矿渣粉复合胶凝材料的轨道板混凝土渗透性的影响规律,研究了不同养护条件下 ( 蒸汽养护和标准养护) 轨道板混凝土表面吸水率和抗氯离子渗透性能( 6 h 电通量和氯离子扩散系数) ,并分析了不同蒸汽养护最高恒温温度对复合胶凝材料水化程度的影响。试验结果表明: 蒸汽养护能有效提高轨道板混凝土材料早期 ( 28 d) 和后期( 56 d) 抗水渗透能力,而对其抗氯离子渗透能力的改善作用则主要表现在早期,对混凝土后期抗氯离子渗透能力影响不明显; 在对复合胶凝材料水化程度的影响方面,蒸汽养护会显著加快水泥-矿渣粉复合胶凝材料体系的水化进程,有利于提高水化产物密实度,蒸汽养护最高恒温不超过60 ℃对提高水泥基胶凝材料抗渗性更加有利。

 

关键字: 蒸汽养护; 轨道板混凝土; 渗透性; 化学结合水

Influence of steam-curing on the permeability of track slab concrete of high speed railway
ZHAO Jian1,TAN Yan-bin2,3,LI Hua-jian2,3,XIE Yong-jiang2,3,YI Zhong-lai2,3

1.School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;
2.China Academy of Railway Science,Beijing 100081,China;
3.State Key Laboratory for Track Technology of High-Speed Rrailway,Beijing 100081,China

Abstract:To uncover the influence of steam-curing on the permeability of track slab concrete which based on cement-slag compound cementitious materials,the surface absorption rate and chloride permeability resistance (6 h charge passed and chloride ions migration coefficient) of track slab concrete under different curing conditions(steam-curing and standard curing) were studied,and the effect of different steam-curing temperature on the hydration degree of compound cementitious materials was also studied.The results show that steam-curing is propitious to increase the water permeability resistance of track slab concrete both in early age( 28 d) and late age( 56 d) .For chloride permeability resistance of concrete,steam-curing can enhance the early chloride permeability resistance,but has slightly effect at late age.Steam-curing can promote the hydrate process of cement-slag compound cementitious materials remarkably,and it is propitious to increase the density of hydration production and more benefit for the increase of impermeability of compound cementitious materials when the highest curing temperature below 60 ℃.

 

Key words: steam-curing; track slab concrete; permeability; non-evaporable water

ISSN 1672-7029
CN 43-1423/U

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