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| 摘要: |
| 从暴露26 a和21 a的实际混凝土工程中钻取了一批直径为100 mm的混凝土芯样,利用干磨技术和化学分析方法测量了其Cl-,CaCO3和Ca(OH)2含量.结果表明,在潮湿环境下混凝土碳化进展缓慢,混凝土碳化深度最终趋于一个极限值.对比CaCO3和Ca(OH)2的含量,发现与海水长期接触的混凝土存在Ca(OH)2的溶出和C-S-H的进一步脱钙,这会加剧Cl-对其的侵蚀作用.当存在Ca(OH)2的溶出时,以CaCO3含量来评价混凝土碳化的方法将变得不可靠. |
| 关键词: 碳化 溶出 |
| DOI： |
| 分类号:TU528.36 |
| 基金项目:国家自然科学基金，国家科技支撑计划 |
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| Carbonation and Calcium Leaching in Concrete under Marine Environment |
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FAN Hong CAO Wei-qun ZHAO Tie-jun
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| Abstract: |
| Concrete core specimens were taken onsite from concrete construction after 26 a and 21 a exposure respectively.The contents of Cl~-,CaCO_3 and Ca(OH)_2 in the cores were determined by using the dry grinding technique and chemical analysis.Results show that the carbonation is low in humid environment and approaches a limit value.By comparing the content of CaCO_3 and Ca(OH)_2,it is found that in concrete in long-term contact with sea water the leaching of(Ca(OH)_2) and a progressive decalcification of C-S-H have happened,and this has a detrimental influence on Cl~-corrosive effect.It is not reliable by evaluating carbonation with content of(CaCO_3) on condition that Ca(OH)_2 leaching happens. |
| Key words: Ca(OH)2 C-S-H |
