###
DOI:
工程科学与技术:2012,44(4):90-95
←前一篇   |   后一篇→
本文二维码信息
码上扫一扫!
考虑温度历程的早龄期大坝混凝土自生体积变形分离方法现场试验
(1.武汉大学 水资源与水电工程科学国家重点实验室;2.三峡大学 水利与环境学院;3.中国长江三峡集团公司)
Field Test on the Separation of Autogenous Deformation of Dam Concrete at Early Age Considering Temperature History
(1.National Key Lab. of Water Resource and Hydropower Eng. Sci.,Wuhan Univ.;2.College of Hydyaulic and Environmental Eng., China Three Gorges Univ.;3.China Three Gorges Co.)
摘要
图/表
参考文献
相似文献
附件
本文已被:浏览 2571次   下载 2
投稿时间:2012-02-29    修订日期:2012-05-11
中文摘要: 混凝土在水化过程中会产生自生体积变形和温度应变等现象,与混凝土的耐久性有着密切联系,为工程建设各方所关注。对此,在西南某混凝土特高拱坝混凝土浇筑现场,采用无应力计对冷却水管周围两处不同位置处早龄期混凝土的应变进行现场监测,运用成熟度理论考虑混凝土的温度历程对混凝土水化进程的影响,采取一种新方法将总应变计算式解耦,从而摆脱对早龄期混凝土的热膨胀系数为定值的依赖,得出混凝土热膨胀系数在等效龄期下的历程,最终从无应力计变形监测值中分离出温度应变和自生体积变形。试验结果表明:这种方法能考虑混凝土温度因素,精确便捷地对早龄期混凝土的热膨胀系数以及自生体积变形进行分离,给现场混凝土的养护以及防裂施工提供指导。
Abstract:Based on the fact that concrete undergoes autogenous deformation and temperature deformation during its hydration advancement, which is closely linked with the durability of concrete and is concerned by engineering construction parties, two stress-free meters that were located on different places around the cooling pipe in a southwest concrete extra-high arch dam construction site were used to monitor the total deformations, and a new method with the consideration of concrete temperature history was adopted for decoupling the monitored deformations. This method could avoid the dependence on taking thermal expansion coefficient of early age concrete as a constant value, thus, the curve of thermal expansion coefficient vs. equivalent age was got and finally temperature deformation and autogenous deformation were separated from the data. Test results showed that the method could consider temperature history, separate the thermal expansion coefficient and autogenous deformation of concrete at early age more precisely and easily, and provide guidance for the site concrete curing and anti-crack constructions.
文章编号:201200132     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(51079079)
作者简介:
引用文本:
宫经伟,周宜红,黄耀英,瞿立新,周绍武,李金河,谌东升,汤国庆,付学奎.考虑温度历程的早龄期大坝混凝土自生体积变形分离方法现场试验[J].工程科学与技术,2012,44(4):90-95.
Gong Jingwei,Zhou Yihong,Huang Yaoying,Qu Lixin,Zhou Shaowu,Li Jinhe,Shen Dongsheng,Tang Guoqing,Fu Xuekui.Field Test on the Separation of Autogenous Deformation of Dam Concrete at Early Age Considering Temperature History[J].Advanced Engineering Sciences,2012,44(4):90-95.