大跨径桥梁高强混凝土收缩徐变特性研究  

Study of high-strength concrete creep and shrinkage for long-span bridges

作　　者：陈灿明[1] 黄卫兰[1] 王宏[1] 唐崇钊[1] 丁建彤[1] 

机构地区：[1]南京水利科学研究院水利部水科学与水工程重点实验室,江苏南京210029

出　　处：《水利水运工程学报》2010年第4期62-67,共6页Hydro-Science and Engineering

基　　金：交通部西部交通建设科技项目(200631822327)

摘　　要：介绍了高强混凝土收缩徐变测试及其成果在大跨径预应力混凝土桥梁建设中的应用.分析论述了减水剂、早强剂和硅粉3类外加剂对收缩徐变的影响,以及收缩徐变与试件等效厚度的关系;构件尺寸和湿度条件仅与干徐变和干缩有关.提出可采用相似曲线平移法进行湿度调整,在缺乏徐变与等效厚度关系资料时可借鉴已有成果作插值推算.High-strength concrete creep and shrinkage tests as well as its application to the long-span pre-stressed concrete girder bridge are described in the paper.The test results include size effect of creep and shrinkage specimens and comparative analysis of creep and shrinkage.Some influences of two kinds of water reducing agent,early strength agent and silicon powder on creep and shrinkage are analyzed.The methods of equivalent thickness and size effect are proposed.The tests show that component size and humidity conditions merely affect dry creep and dry shrinkage,therefore,it is proposed that the method of shifting a similar curve is adopted to adjust humidity.If there is lack of data（results） between creep and equivalent thickness,interpolation method is adopted according to present data.Calculation reckoning should be indicated in detail and the present data should be proved.

关 键 词：高强混凝土 徐变 收缩 外加剂 尺寸效应 湿度调整 

分 类 号：U448.35[建筑科学—桥梁与隧道工程] TU528.042[交通运输工程—道路与铁道工程]