| 粉煤灰对高强混凝土收缩徐变的影响试验研究及其修正模型 |
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| 引用本文： | 汪建群,方志,邓波,马占飞,祝明桥.粉煤灰对高强混凝土收缩徐变的影响试验研究及其修正模型[J].保鲜与加工,2016,16(3):110-117. |
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| 作者姓名： | 汪建群 方志 邓波 马占飞 祝明桥 |
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| 作者单位： | 湖南科技大学 土木工程学院, 湖南 湘潭 411201;长沙理工大学 桥梁工程安全控制省部共 建教育部重点试验室, 长沙 410004,湖南大学 土木工程学院, 长沙 410082,中交武汉港湾 工程设计研究院有限公司, 武汉 430040,中国水利水电第十四工程局有限公司, 昆明 650041,湖南科技大学 土木工程学院, 湖南 湘潭 411201 |
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| 基金项目： | 国家自然科学基金(51408218);长沙理工大学桥梁工程安全控制省部共建教育部重点实验室开放基金(13KB02);湖南省教育厅资助项目(12C0135) |
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| 摘 要： | 粉煤灰对高强混凝土收缩徐变的影响直接关系到结构长期性能的合理确定。制作粉煤灰掺量分别为0、12%和24%的100 mm×100 mm×400 mm的C50混凝土棱柱体试件,在试验室条件下进行收缩及不同加载龄期的徐变试验,研究了粉煤灰对高强混凝土收缩徐变的影响。根据试验结果评估了目前常用的4种相关规范公式对高强混凝土收缩徐变的适用性,并引入粉煤灰影响系数以综合反映粉煤灰掺量和加载龄期对高强混凝土收缩徐变的影响,根据试验结果和现有研究成果提出了其修正模型。分析结果表明,JTG D 62和GL 2000推荐的收缩徐变预测模式与基准试件实测结果较为吻合,验证结论亦说明所引入的粉煤灰影响系数可应用于掺粉煤灰高强混凝土的收缩徐变预测。
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| 关 键 词： | 粉煤灰 高强混凝土 收缩 徐变 长期性能 |
| 收稿时间： | 2015/11/11 0:00:00 |
Experimental analysis of shrinkage and creep of high strength concrete with fly ash and the correction model |
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| Wang Jianqun,Fang Zhi,Deng Bo,Ma Zhanfei and Zhu Mingqiao.Experimental analysis of shrinkage and creep of high strength concrete with fly ash and the correction model[J].Storage & Process,2016,16(3):110-117. |
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| Authors: | Wang Jianqun Fang Zhi Deng Bo Ma Zhanfei and Zhu Mingqiao |
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| Institution: | College of Civil Engineering, Hunan University of Science & Technology, Xiangtan 411201, Hunan, P. R. China;Key Laboratory of Bridge Engineering Safety Control Built by Hunan Province and Ministry of Education, Changsha University of Science & Technology, Changsha 410004, P. R. China,College of Civil Engineering, Hunan University, Changsha 410082, P. R. China,CCCC WuHan Harbour Engineering Design And Research Co. Ltd, Wuhan, 430040, P. R. China,Sinohydro Bureau 14 Co. Ltd., Kunming 650041, P. R. China and College of Civil Engineering, Hunan University of Science & Technology, Xiangtan 411201, Hunan, P. R. China |
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| Abstract: | The shrinkage and creep of high strength concrete was affected by the mixed fly ash. The influence was directly related to the long-term behavior of structures. The shrinkage and creep experiment of C50 concrete with fly ash content 0, 12%, 24% were conducted with 100 mm×100 mm×400 mm prism specimens in the laboratory. Four kinds of current commonly used specifications for the shrinkage and creep of high strength concrete were assessed. With the experiment results and other existing research referenced, the fly ash influence coefficient and its correction model were introduced to reflect the influence of different load age and fly ash content. The analysis showed that the shrinkage and creep mode recommended from JTG D62 and GL 2000 agreed well with the measured results form the reference specimens. And the verification conclusion demonstrated that the introduced fly ash influence coefficient could be applied to the shrinkage and creep of high strength concrete with fly ash. |
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| Keywords: | fly ash high strength concrete shrinkage creep long-term behavior |
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