桥涵结构补强中新旧混凝土结合状态研究  

Study on the Bonding States Between Old and New Concretes During Bridge Repair

作　　者：廖卫东[1] 水中和[2] 秦明强[2] 田建平[2] 肖斌[1] 

机构地区：[1]湖北武黄高速公路大修工程指挥部,武汉430074 [2]武汉理工大学硅酸盐材料工程教育部重点实验室,武汉430070

出　　处：《武汉理工大学学报》2003年第12期92-94,共3页Journal of Wuhan University of Technology

基　　金：湖北省科技攻关计划 ( 2 0 0 3AA10 1C77)

摘　　要：研究用砂浆的抗折试验来评价桥涵修补中新旧混凝土结合状态 ,从而为桥涵加固寻找合理有效的施工方法。探讨了气干基底、湿饱和基底 2种方式对新旧混凝土界面结合的影响 ,同时研究了外掺物 (粉煤灰、高聚物 )对界面的结合作用。实验结果表明 :气干基底与新混凝土的结合强度强于与湿饱和基底的结合。修补用的混凝土中外掺 30 %的粉煤灰可使早期界面结合强度提高 ,2 8d结合强度也略有提高 ;外掺 15 %高聚物可使界面结合强度提高 5 %～ 10 %。In order to find reasonable and effective technical measures to consolidate bridges,the bonding states between new and old concretes were investigated with the bending test.The author has discussed the influences of the substrates in air dry and wet saturated states and additions (such as fly ash,polymer) on the interfacial bond.The results show that the bonding strength of the air dry substrate+new concrete is higher than that of the wet saturated substrate+new concrete.With the addition of 30% fly ash,the bonding strength can enhance to a certain degree.15% polymer can lead to the bonding strength 5%～10% higher.

关 键 词：混凝土结构补强 混凝土界面 界面结合强度 

分 类 号：TU528.4[建筑科学—建筑技术科学]