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掺合料混凝土早期碳化的微观分析
Micro-analysis on Early Carbonation of Mineral Admixture Concrete
投稿时间: 2017-06-24  最后修改时间: 2017-09-21
DOI:
中文关键词:  掺合料混凝土  早期碳化  酚酞测试  PH值测试  物质成分分析
英文关键词:Mineral admixture concrete  Early carbonation  Phenolphthalein reagent test  pH value test  Material composition analysis
基金项目:国家自然科学基金资助项目(51308441,51678473);陕西省自然科学基础研究计划(2016JM5073);陕西省教育厅专项科研计划项目(2013JK0951)
作者单位E-mail
胡晓鹏 西安建筑科技大学土木学院 shs339@sina.com 
孙广帅 西安建筑科技大学土木学院  
张成中 西安建筑科技大学土木学院  
张永利 西安建筑科技大学土木学院  
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中文摘要:
      为研究掺合料混凝土早期碳化过程中的微观性能变化,通过pH值测试研究了掺合料混凝土早期碳化后混凝土内部pH值沿试件深度的分布规律,对比pH值测试结果和酚酞测试结果探讨了酚酞试剂测试早期碳化方法的可靠性,通过化学成分分析了混凝土早期碳化过程中物质成分的变化规律。研究表明:从表面向内部方向,混凝土试块pH值不断增大并逐渐变缓趋于一定值;随着掺合料掺量的增加,混凝土孔溶液中的pH值减小,减小量随着试件深度的增加而减小,掺合料混凝土的碱性减弱,砂浆试件可碳化的Ca(OH)2含量减小;混凝土孔溶液中的pH值随着养护时间的延长而逐渐增大,且其增大量随着试件深度的增加而减小;随着龄期的延长,混凝土表面的pH值逐渐减小而试件深处的pH值变化不大;酚酞溶液测得的碳化深度约为pH值法测得的完全未碳化深度的0.53倍;沿砂浆侧面向内部方向,CaCO3含量逐渐减小并趋于定值而Ca(OH)2含量逐渐增大趋于定值。
英文摘要:
      To study the micro-performance change of admixture concrete in process of early carbonation, the pH value distribution along the depth of concrete specimen after early carbonation was studied through pH value test. By comparing pH value test results with phenolphthalein test results, the applicability of phenolphthalein reagent test method was discussed. The change law of material composition during early carbonation was analyzed by chemical composition analysis. The results show that from surface to inner direction, the pH value of concrete specimen increases and gradually tends to be a certain value. With the increase of admixture content, the pH value of concrete pore solution decreases, and the decrease amount decreases with the increase of specimen’s depth, the alkalinity of mineral admixture concrete weakens, the Ca(OH)2 content of mortar specimen which can be carbonized decreases. The pH value of concrete pore solution increases with the increase of curing time, and its increment deceases with the increase of specimen’s depth. As the concrete age increases, the pH value of specimen’s surface decreases gradually while the pH value of specimen’s deep doesn’t change obviously. The carbonation depth by phenolphthalein solution test is about 0.53 times of the non-carbonated depth by pH value test. Along the side surface to inner direction of mortar specimen, the CaCO3 content decreases gradually and tends to be a constant value while the Ca(OH)2 content increases gradually and tends to be a constant value.
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