吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (3): 783-787.doi: 10.13229/j.cnki.jdxbgxb201503015

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碳化对混凝土碱骨料反应的影响

柳俊哲, 袁伟静, 贺智敏, 巴明芳, 陈剑斌   

  1. 宁波大学 建筑工程与环境学院,浙江 宁波315211
  • 收稿日期:2013-08-12 出版日期:2015-05-01 发布日期:2015-05-01
  • 作者简介:柳俊哲(1964-),男,教授,博士生导师.研究方向:混凝土结构耐久性.
  • 基金资助:
    国家自然科学基金项目(51278255,51478277); 宁波市重大科技计划项目(2013C51006)

Influence of carbonation on alkali-aggregate reaction in concrete

LIU Jun-zhe, YUAN Wei-jing, HE Zhi-min, BA Ming-fang, CHEN Jian-bin   

  1. Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo 315211, China
  • Received:2013-08-12 Online:2015-05-01 Published:2015-05-01

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摘要： 为了合理地评价混凝土碱骨料反应发生的碱含量,研究了碳化对水泥石中钠离子分布的影响,阐明碳化作用下混凝土碱骨料反应特征。研究结果表明:水泥石碳化之前截面的钠离子分布比较均匀,碳化作用下水泥石中钠离子从碳化区向非碳化区迁移和浓缩,钠离子在碳化区浓度减少,非碳化区浓度升高,碳化界面钠离子浓度最大,显著提高水泥石内未碳化区的钠离子浓度,降低碱骨料反应发生的初始碱含量限制标准,易发生碱骨料反应。

关键词: 建筑工程, 碳化, 钠离子, 迁移, 碱骨料反应

Abstract: In order to reasonably evaluate alkali content generated in alkali-aggregation reaction in concrete, the influence of carbonation on sodium ion concentration distribution inside hardened cement paste was investigated; the alkali-aggregate reaction characteristics in concrete under carbonation were clarified. The results show that sodium chloride distribution is relatively uniform before carbonation; during carbonation process sodium ions in the carbonation area migrate to the non-carbonation area, sodium ion concentration decreases in the carbonation area and increases in the non-carbonation area, and reaches maximum peak value in the carbonation interface. Thus the carbonation increases the sodium ion concentration in non-carbonation area in the concrete and reduces the initial critical sodium ion concentration for alkali aggregate reaction in the concrete that accelerates the alkali aggregate reaction.

Key words: architectural engineering, carbonation, sodium ion, migration of ion, alkali aggregate reaction

中图分类号: 

  • TU528
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