摘要
介绍了世界第一跨度巫山长江大桥钢管混凝土的配合比设计方法与施工工艺。所设计的混凝土泵送顶升施工性能好、高强、早强和微膨胀。混凝土拌合物初始坍落度23cm,4h坍落度19cm,3d抗压强度56MPa,达设计强度的90%以上,28d抗压强度79MPa,弹性模量4.6×104MPa,核心混凝土自应力为3.6MPa。采用锤击、超声波与钻芯取样等检测方法对主拱钢管混凝土进行检测,结果表明,钢管内混凝土密实,且与钢管壁无脱粘现象,满足工程设计要求。
The mixture proportion and construction technology of the steel tube-confined concrete of the Wushan Yangtze River Bridge, which took the first steel span in the world, was introduced in this paper. The worksite construction showed the concrete had some properties such as perfect workability, very high strength at the later stage and the early stage, compensating shrinkage. The slump of fresh concrete mixture was 23cm and flowability was higher than 60cm, those meet the needs of requirements of concrete pumping techniques. The 3d compressive strength reaches 90% of designed strength and the 28d compressive strength and the modulus of elasticity are 79MPa and 4.6×10^4MPa, respectively. Furthermore, the self-stress of the core concrete is 3.6MPa. The hammer-beating detecting, ulwasonic-detecting and boring core-detecting showed that the concrete filled in the tubes and sewed planks was very dense and there wasn＇t crack between concrete and steel tube or concrete and sewed planks, which showed that the combination configuration was fine and meet the needs of the engineering requirements.
出处
《混凝土》
CAS
CSCD
北大核心
2006年第10期61-64,共4页
Concrete
关键词
钢管混凝土
泵送
配合比
施工
steel tube-confined concrete
pumping
concrete proportion
construction
作者简介
丁庆军（1962-）,男,武汉理工大学教授,主要从事高性能水泥与混凝土的研究.[单位地址]武汉理工大学材料科学与工程学院（430070）[联系电话]027-87668602（办）,027-62854859; E-mail：pnyzh@163.com
