[1]徐文,钱春香,庄园.粉煤灰对混凝土AAR有效碱的影响及机理[J].东南大学学报(自然科学版),2010,40(2):380-384.[doi:10.3969/j.issn.1001-0505.2010.02.031]
 Xu Wen,Qian Chunxiang,Zhuang Yuan.Effect of fly ash on available alkali for AAR and its mechanism in concrete[J].Journal of Southeast University (Natural Science Edition),2010,40(2):380-384.[doi:10.3969/j.issn.1001-0505.2010.02.031]
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粉煤灰对混凝土AAR有效碱的影响及机理()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
40
期数:
2010年第2期
页码:
380-384
栏目:
材料科学与工程
出版日期:
2010-03-20

文章信息/Info

Title:
Effect of fly ash on available alkali for AAR and its mechanism in concrete
作者:
徐文 钱春香 庄园
东南大学材料科学与工程学院,南京 211189; 东南大学江苏省土木工程材料重点实验室,南京 211189
Author(s):
Xu Wen Qian Chunxiang Zhuang Yuan
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China
关键词:
混凝土 碱集料反应 有效碱 粉煤灰 混凝土孔溶液
Keywords:
concrete alkali aggregate reaction effective alkali fly ash pore solution of concrete
分类号:
TU528.45
DOI:
10.3969/j.issn.1001-0505.2010.02.031
摘要:
为准确从碱与活性集料反应的角度掌握碱集料反应(AAR),在前人研究基础上,赋予有效碱更进一步的定义,将进入活性集料中的碱称为有效碱.采用火焰光度法对有效碱含量和混凝土孔隙溶液碱离子浓度进行了测定,并据此分析了粉煤灰抑制AAR机理.试验结果表明:掺加粉煤灰后,混凝土基体孔隙溶液碱离子浓度降低,从而减少了活性集料中的有效碱,而粉煤灰掺入改变基体扩散系数对有效碱的影响则是次要的.因此可通过测量早期孔隙溶液碱离子浓度变化来评价粉煤灰对AAR的抑制效果.
Abstract:
A further definition of effective alkali is proposed based on the studies of predecessors and the alkali entering aggregates is called effective alkali, which is adopted to grasp alkali aggregates reaction(AAR)accurately from the reaction angle of alkali and reactive aggregates.The effective alkali content and alkali ions concentration of concrete pore solution were investigated by flame photometry and accordingly the inhibitory mechanism of fly ash on AAR was analyzed.The results show that after the addition of fly ash the alkali ions concentration of concrete pore solution decreases, which reduces the effective alkali in reactive aggregates, while the influence of paste diffusion coefficient change for alkali ions on the effective alkali is secondary.Therefore, the inhibitory effect of fly ash on AAR can be evaluated by measuring the early alkali ions concentration change of concrete pore solution.

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备注/Memo

备注/Memo:
作者简介: 徐文(1985—),男,硕士生; 钱春香(联系人),女,博士,教授,博士生导师,cxqian@seu.edu.cn.
基金项目: 国家自然科学基金重点资助项目(50539040)、国家重点基础研究发展计划(973计划)资助项目(2009CB623200).
引文格式: 徐文,钱春香,庄园.粉煤灰对混凝土AAR有效碱的影响及机理[J].东南大学学报:自然科学版,2010,40(2):380-384. [doi:10.3969/j.issn.1001-0505.2010.02.031]
更新日期/Last Update: 2010-03-20