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題名 | 粉煤灰高性能混凝土碳化規律及顯微結構分析=Carbonation of Fly Ash High-performance Concrete and Mircrostructural Analysis |
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作者姓名(中文) | 陳偉; 周紫晨; 水中和; | 書刊名 | 工程科技與教育學刊 |
卷期 | 7:2 2010.04[民99.04] |
頁次 | 頁414-420 |
分類號 | 440.327 |
關鍵詞 | 粉煤灰混凝土; 碳化反應; 介面過渡區; 顯微結構; 顯微硬度; Fly ash concrete; Carbonation; Interfacial transition zone; Microstructure; Micro-hardness; |
語文 | 中文(Chinese) |
中文摘要 | 研究了碳化時間、粉煤灰摻量和水膠比對粉煤灰高性能混凝土抗碳化反應能力的影響,並運用顯微分析方法研究了碳化反應改變水泥漿體及介面過渡區特性的規律。用粉煤灰取代高性能混凝土中的水泥導致混凝土早期抗碳化能力下降,而後期抗碳化能力有一定程度的提升;粉煤灰高性能混凝土的抗碳化性能隨水膠比的減小而提高;碳化反應可以提高水泥漿體及混凝土介面過渡區的顯微硬度和密實程度。當粉煤灰摻量較小時,碳化反應可以減小混凝土介面過渡區的寬度。 |
英文摘要 | The effects of carbonation age, fly ash content in the binder and the water to binder ratios on the carbonation depth of fly ash concrete is investigated and the micromechanical properties of the hardened paste and the inter facial transition zone is analyzed with the micro-hardness method. The experimental results show that replacing Portland cement in concrete with fly ash increases the carbonation rate at early ages, while the late age carbonation rate is lowered. Decreasing the water to binder ratios of concrete enhances the carbonation resistance of concrete. Micromechanical analysis shows that the carbonation reaction increases the micro-hardness of the paste and the compactness of the ITZ. For the relative low replacement levels, the width of the ITZ is reduced if the concrete is carbonated. |
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