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李一鸣,贺智敏,沈黄冰,柳俊哲,巴明芳.偏高岭土对蒸养混凝土界面区显微硬度及统计分布的影响水资源与水工程学报[J].,2019,30(1):176-182
偏高岭土对蒸养混凝土界面区显微硬度及统计分布的影响
Effect of metakaolin on micro-hardness and statistical distribution of interfacial transition zone in steam-cured concrete
  
DOI:10.11705/j.issn.1672-643X.2019.01.27
中文关键词:  蒸汽养护  偏高岭土  混凝土界面区  显微硬度  统计分布
英文关键词:steam curing  metakaolin  interfacial transition zone of concrete  micro-hardness  statistical distribution
基金项目:浙江省自然科学基金项目(LY17E080007); 宁波大学胡岚优秀博士基金项目(ZX2014000168)
作者单位
李一鸣,贺智敏,沈黄冰,柳俊哲,巴明芳 (宁波大学 建筑工程与环境学院 浙江 宁波 315211) 
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中文摘要:
      为获得蒸养掺偏高岭土(MK)混凝土界面区的微观力学性能,测试了不同MK掺量蒸养混凝土界面区的显微硬度,运用概率统计方法进行界面区显微硬度数据处理,并结合热重分析和电镜观察阐明其作用机理。结果表明:界面区显微硬度数据呈明显的离散分布特征,并不符合通常认为的正态分布,而更符合3-Parameter Lognormal Logistic分布;运用统计分析得到的界面区显微硬度曲线离散性较低,对界面区强度表征更加准确;掺偏高岭土增强了界面区显微硬度;随龄期增长,界面区显微硬度值增加,宽度减小;蒸养条件下,偏高岭土发生二次水化反应,消耗Ca(OH)2晶体,生成更多的C-S-H凝胶,强化了界面区。
英文摘要:
      In order to obtain the micro mechanical properties of interfacial transition zone(ITZ) of steam-cured concrete with metakaolin(MK), the micro-hardness of the interface area of steamed concrete with different MK content was tested, probabilistic statistical methods were used to process ITZ micro-hardness data of steam-cured concrete incorporating MK, and its action mechanism was clarified by thermogravimetric analysis and scanning electron microscope. Results indicate that micro-hardness data of the ITZ take on obvious discrete distribution characteristics, and do not meet the normal distribution, and more in line with the 3-Parameter Lognormal Logistic distribution. Using 3-Parameter Lognormal Logistic distribution makes the discreteness of the ITZ micro-hardness curve reduced and the characterization of ITZ strength is more accurate. Metakaolin increase concrete ITZ micro-hardness, and with the increase of curing age, the micro-hardness value of concrete ITZ increase and the ITZ width decrease. Under steam curing conditions, MK occurs a secondary hydration reaction with more consumption of Ca(OH)2, and Ca(OH)2 crystals . More C-S-H gel are produced and the ITZ of steam-cured concrete is densified.
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