斜拉桥异形主塔钢混结合段自密实混凝土配合比研究  

Research on self-compacting concrete mixtureproportionin steel-concrete composite sections of cable-stayed bridge with special shaped tower

作　　者：赵果[1] 焦燏烽[1] 梁斌[1] 周长青[2] 聂宁波[2] 

机构地区：[1]河南科技大学土木工程学院,河南洛阳471023 [2]中铁十五局集团有限公司一公司,陕西西安710018

出　　处：《混凝土》2016年第8期110-113,共4页Concrete

基　　金：国家自然科学基金资助项目(41272290);河南省重点科技攻关项目(082102230026)

摘　　要：针对斜拉桥异形主塔钢混结合段的特殊构造特点和施工工艺要求,结合安徽涡河三桥工程,对C50高性能自密实微膨胀混凝土的配合比进行试验研究。在此基础上,考虑不同外加剂、掺合料掺量等因素对钢混结合段内混凝土性能的影响,进行配合比优化试验并得到钢混结合段混凝土配合比。结果表明:膨胀剂掺量对混凝土工作性能影响较大,掺量为10%时混凝土性能最佳。本试验结果有效解决了钢混结合段入模难、易收缩开裂等技术难题,为同类结构的自密实混凝土配合比试验提供了参考。In consideration of specific constructional characteristics and technology requirements of steel-concrete composite sections of cable-stayed bridge with special shaped tower, C50high performance of self-compacting micro expansion concrete mixture proportion were studied, based on practical project Anhui Guohe River Bridge.It also presents the reasonable mixture proportion for steel-concrete composite section via tests on specimens with different contents of additives.The results indicate that expanding agent has great impact on concrete performance, with best property when content is 10%.The results can effectively solve the technical problems of the steel concrete compos- ite, such as the difficulty of entering the mold, easy to shrink, and so on.It also provides a reference for mixture ratio test for the similar structure of self-compacting concrete.

关 键 词：自密实混凝土 异形主塔 钢混结合段 配合比 

分 类 号：TU528.062[建筑科学—建筑技术科学]