| 粉煤灰混凝土的抗冻性能及机理分析 |
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| 引用本文： | 袁晓露,李北星,崔巩,赵尚传.粉煤灰混凝土的抗冻性能及机理分析[J].混凝土,2008(12). |
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| 作者姓名： | 袁晓露 李北星 崔巩 赵尚传 |
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| 作者单位： | 1. 武汉理工大学,硅酸盐教育部重点实验室,湖北,武汉,430070
2. 交通部公路科学研究院,北京,100088 |
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| 基金项目： | 西部交通建设科技项目
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| 摘 要： | 内部孔结构是影响混凝土受冻融破坏的关键因素;外掺粉煤灰改变了混凝土的孔结构,增加总孔隙率,细化最可几孔径分布,使混凝土冻融破坏方式由静水压侵蚀向渗透压侵蚀转变,加剧了结构性能的劣化.试验研究结果表明:粉煤灰混凝土的抗冻性能随水胶比的增加而显著下降;随粉煤灰掺量的增加,引气型混凝土的抗冻融侵蚀能力明显降低;配制粉煤灰混凝土必须掺入引气剂,以保证必要的抗冻性能.
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| 关 键 词： | 粉煤灰 混凝土 抗冻性能 引气剂 |
Frost resistance of fly ash concrete and its mechanism |
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| YUAN Xiao-lu,LI Bei-xing,CUI Gong,ZHAO Shang-chuan.Frost resistance of fly ash concrete and its mechanism[J].Concrete,2008(12). |
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| Authors: | YUAN Xiao-lu LI Bei-xing CUI Gong ZHAO Shang-chuan |
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| Affiliation: | 1.Key Laboratory of Silicate Material Science;Wuhan University of Technology;Wuhan 430070;China;2.Research Institute of Highway Ministry of Communications;Beijing 100088;China |
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| Abstract: | The pore structure has the key effect on the frost damage of concrete.Fly ash changes the pore structure of concrete,which transforms the damage process of concrete from hydraulic pressure theory to osmotic pressure theory,and aggravates the deterioration of properties of the concrete.The experimental results show that the frost resistance of fly ash concrete decreases significantly with the increase of water binder ratio.The frost resistance of air-entraining concrete decreases obviously with the increase ... |
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| Keywords: | fly ash concrete frost resistance air-entraining agent |
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