箱梁C55高性能混凝土的抗裂性能研究  

Investigation of Cracking Resistance Behavior of C55 High Performance Concrete Used for Box Girder

作　　者：李北星[1] 田晓彬[2] 胡明义[2] 关爱军[2] 查进[1] 周明凯[1] 

机构地区：[1]武汉理工大学硅酸盐材料工程教育部重点实验室,湖北武汉430070 [2]鄂东长江公路大桥有限公司,湖北黄石435000

出　　处：《世界桥梁》2010年第3期40-42,53,共4页World Bridges

基　　金：交通部科技项目(2007353342180)

摘　　要：针对鄂东长江公路大桥预应力混凝土宽箱梁,通过水化热、绝热温升、平板开裂、干燥收缩、温度~应力开裂等试验方法,研究箱梁C55高性能混凝土的早期抗裂性能。试验结果表明,采用适量粉煤灰或粉煤灰与矿粉复掺,可以改善箱梁C55高性能混凝土的抗裂性能,掺入聚丙烯纤维可进一步提高其抗裂性能。箱梁采用粉煤灰高性能混凝土,未发现有害裂缝,外观良好。In the light of the characteristic of the wide prestressed concrete box girder of Edong Changjiang River Highway Bridge and by means of testing of the hydration heat,adiabatic temperature rise,flat slab cracking,dry shrinkage as well as the temperature^stress cracking,the early stage cracking resistance behavior of the C55 high performance concrete used for the box girder is investigated.The results of the testing show that the adding of appropriate amount of the fly ash or composite of the fly ash and gran...

关 键 词：箱形梁 高性能混凝土 早期开裂 试验 

分 类 号：U444[建筑科学—桥梁与隧道工程]