| 蒸汽养护对高速铁路轨道板混凝土渗透性的影响 |
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| 引用本文： | 赵健,谭盐宾,李化建,谢永江,易忠来. 蒸汽养护对高速铁路轨道板混凝土渗透性的影响[J]. 铁道科学与工程学报, 2012, 0(3): 8-12 |
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| 作者姓名： | 赵健 谭盐宾 李化建 谢永江 易忠来 |
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| 作者单位： | 西南交通大学土木工程学院;中国铁道科学研究院;高速铁路轨道技术国家重点实验室 |
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| 基金项目： | 国家重点基础研究发展计划(“973”计划)项目(2010CB736102);国家自然科学基金资助项目(50908229) |
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| 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。
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| 关 键 词： | 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 |
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| ZHAO Jian,TAN Yan-bin,LI Hua-jian,XIE Yong-jiang,YI Zhong-lai. Influence of steam-curing on the permeability of track slab concrete of high speed railway[J]. Journal of Railway Science and Engineering, 2012, 0(3): 8-12 |
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| Authors: | ZHAO Jian TAN Yan-bin LI Hua-jian XIE Yong-jiang YI Zhong-lai |
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| Affiliation: | 2,3(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) |
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| 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 ℃. |
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| Keywords: | steam-curing track slab concrete permeability non-evaporable water |
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