| 引气剂对混凝土性能的影响研究 |
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| 引用本文： | 周世华,杨华全,董维佳,苏杰.引气剂对混凝土性能的影响研究[J].混凝土,2008(11). |
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| 作者姓名： | 周世华 杨华全 董维佳 苏杰 |
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| 作者单位： | 长江科学院,水利部水工程安全与病害防治工程技术研究中心,湖北,武汉,430010 |
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| 基金项目： | 国家自然科学基金重点项目 |
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| 摘 要： | 测试了掺引气剂混凝土硬化后的气泡参数,并分析了引气剂对混凝土性能的影响.试验发现,引气剂的泡沫稳定性越高,新拌混凝土含气量的经时损失越小;新拌混凝土经90 min后含气量与硬化混凝土含气量线性相关.引气剂的掺入降低了混凝土的强度,且掺引气剂混凝土的强度随气泡平均半径增大而降低.掺入引气剂后,混凝土的冻融耐久性得以改善;气泡间距系数对引气混凝土抗冻性的影响非常显著,当气泡间距系数超过300 μm时,混凝土的抗冻性较差.
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| 关 键 词： | 气泡参数 混凝土 气泡间隔系数 冻融耐久性指数 |
Effect of air-entraining agent on properties of concrete |
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| ZHOU Shi-hua,YANG Hua-quan,DONG Wei-jia,SU Jie.Effect of air-entraining agent on properties of concrete[J].Concrete,2008(11). |
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| Authors: | ZHOU Shi-hua YANG Hua-quan DONG Wei-jia SU Jie |
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| Affiliation: | Changjiang River Scientific Research Institute;Center on Water Engineering Safety and Disaster Prevention of the Ministry of Water Resources;Wuhan 430010;China |
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| Abstract: | Properties of air entrained concrete was studied.The loss of air void content through time decreased with the increasing of the foam stability of air-entraining agent.It is shown in experimental that the air void content of hardened concrete was linear with the air content in fresh concrete through 90 minutes.Adding air-entraining agent decreased the strength of concrete,and the strength decreased with the increase of bubble average radius.It has been verified that key factor influencing freeze-thaw durabil... |
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| Keywords: | air void parameters concrete spacing factor durability factor |
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