期刊论文

The effects of casting direction of self-compacting concrete on shear strength between the new and old concrete interface

中文

铁道科学与工程学报

1672-7029

2019

16

3

744-751

10.19713/j.cnki.43?1423/u.2019.03.024

2015CB057706:国家重点基础研究发展计划（973计划） 51708477:国家自然科学基金 51178060:国家自然科学基金 15B015:湖南省教育厅优秀青年项目 201422:湖南省交通科技资助项目

本校为第一机构

针对自密实混凝土加固既有混凝土结构时存在不同方位的黏结界面,为研究其对新老混凝土界面剪切强度的影响,设计具有不同混凝土浇筑成型方向的Z型黏结试件进行直剪试验,探究自密实混凝土浇筑成型方向、混凝土强度和界面处理方式等对黏结试件破坏形式和抗剪强度的影响,并探讨不同浇筑成型方向影响下新老混凝土黏结界面抗剪强度计算方法。研究结果表明:混凝土浇筑成型方向对界面抗剪强度影响显著,新混凝土从老混凝土顶面浇筑的效果最好,侧面浇筑次之,底面浇筑最差,差值最大多达到顶面浇筑试件抗剪强度的50%。一定范围内增大新混凝土强度能有效提高黏结界面抗剪强度,底面浇筑时效果尤为明显;当新老混...

There are different types of interfaces between the self-compacting concrete and the existed concrete because of their different directions. A direct shear test is performed on the Z Type specimens with different compacting directions to investigate the effects of concrete casting direction on the shear behavior between the new and old concrete interface. The influence of new concrete casting direction, concrete strength and the interfacial treatment modes on the failure mode and the ultimate shear strength of the tested specimens are clarified. A model is developed to consider the effects of ...