要:为探明蒸汽养护对采用水泥 一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(6h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 (28d)和后期(56d)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 一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。 关键词:蒸汽养护;轨道板混凝土;渗透性;化学结合水 中图分类 号 :TU528.0l 文献标志码 :A 文章编号 :1672—7029(2012)03—0008—05 Influence ofsteam ——curing onthepermeability oftrackslabconcrete ofhigh speed railway ZHAO Jian ,TANYan.bin ,LIHua-jian。 ,XIEYong-jiang ,YIZhong.1ai' (1.SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu610031,China; 2.ChinaAcademyofRailwayScience,Beijing100081,China; 3.StateKey[~boratoryforTrackTechnologyofHish—SpeedRrailway,Beijing100081,China) Abstract:Touncovertheinfluenceofsteam —-curing on the permeability oftrack slab concrete which based on cement—slagcompoundcementitiousmaterials,the surfaceabsorption rateand chloride permeability resistance (6hchargepassedandchlorideionsmigrationcoeficient)oftrackslab concreteunderdifferentcuringcondi- tions(steam—curingandstandardcuring)werestudied,andtheefectofdifferentsteam~curingtemperatureon thehydrationdegreeofcompoundcementitiousmaterialswasalsostudied.Theresultsshow thatsteam —curingis propitioustoincreasethewaterpermeabilityresistanceoftrackslabconcretebothinearlyage(28d)andlate age(56d).Forchloridepermeabilityresistanceofconcrete,steam—curingcanenhancetheearlychlorideper- meability resistance,buthasslightlyeffectatlateage.Steam —curingcan promotethehydrateprocessofcement — slag compoundcementitiousmaterialsremarkably,anditispropitioustoincreasethedensityofhydrationpro— duction and morebenefitforthe increaseofimpermeabilityofcompound cementitiousmaterialswhenthehighest curing temperaturebelow 60 oC. Key words:steam —curing;track slab concrete;perm eability;non—evaporablewater
因本站资料资源较多,启用了多个文件服务器,如果浏览器下载较慢,请调用迅雷下载,特别是超过了5M以上的文件!请一定调用迅雷,有时候速度就会飞起哦,如果您的浏览器自动加载了PDF预览,文件太大又卡死,请按下载说明里的把PDF插件关闭了就可以直接下载,不会再预览了!