支井河大桥C50钢管微膨胀混凝土配合比试验  

Tests for Mix Proportioning of C50 Micro-Expansion Concrete Used in Steel Tubes of Zhijing River Bridge

作　　者：谢功元[1,2] 彭劲[3] 袁长春[4] 刘军[2] 

机构地区：[1]长安大学桥梁与隧道陕西省重点实验室,陕西西安710064 [2]湖北省交通厅工程质量监督局,湖北武汉440030 [3]湖北沪蓉西高速公路建设指挥部,湖北恩施445000 [4]中铁十三局集团有限公司,吉林长春116033

出　　处：《桥梁建设》2009年第4期32-34,68,共4页Bridge Construction

摘　　要：支井河大桥为主跨430 m的上承式钢管混凝土拱桥,拱圈填充C50微膨胀混凝土,采用泵送施工。根据钢管微膨胀混凝土配合比的原理及设计思路,通过对不同水灰比、含砂率以及不同用量粉煤灰、膨胀剂的配合比试验研究,得出符合工程需要的施工配合比。工程应用表明,钢管内混凝土自密性稳定,混凝土与钢管接触较好,混凝土强度满足要求。Zhijing River Bridge is a concrete-filled steel tube deck arch bridge with a main span 430 m and the arch rings of the Bridge were filled with the C50 micro-expansion concrete by pumping. In accordance with the principle and design considerations of the micro-expansion concrete used in the steel tubes, the concrete mix proportioning with different water/cement ratios, sand content, different usage amounts of fly ash and expansion agent was tested and studied and the mix proportioning applicable to the construction of the Bridge was obtained. The application of the mix proportioning in the construction shows that the self-density performance of the concrete in the steel tubes is stable, the concrete has good contact with the steel tubes and the concrete strength satisfies the requirements.

关 键 词：上承式桥 拱桥 钢管混凝土结构 微膨胀混凝土 配合比 试验 

分 类 号：U448.22[建筑科学—桥梁与隧道工程] TU528.062[交通运输工程—道路与铁道工程]