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CLDB  2017, Vol. 31 Issue (23): 120-124    https://doi.org/10.11896/j.issn.1005-023X.2017.023.017
  专题栏目:超高性能混凝土及其工程应用 |
配筋超高性能混凝土用作免拆模板对短柱力学性能影响的实验研究*
杨医博1, 2, 杨凯越1, 吴志浩1, 林少群1, 丘广宏1, 燕哲1, 彭章锋1, 林燕姿1, 郭文瑛1, 王恒昌1
1 华南理工大学土木与交通学院,广州 510640;
2 华南理工大学亚热带建筑科学国家重点实验室,广州 510640
An Experimental Study on the Influence of Reinforced Ultra-high Performance Concrete Permanent Template to Short Column's Mechanical Property
YANG Yibo1, 2, YANG Kaiyue1, WU Zhihao1, LIN Shaoqun1, QIU Guanghong1, YAN Zhe1, PENG Zhangfeng1, LIN Yanzi1, GUO Wenying1, WANG Hengchang1
1 School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640;
2 State Key Laboratory of Subtropical Architectures Science, South China University of Technology, Guangzhou 510640
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摘要 为进一步提高在海洋浪溅区等严重氯盐腐蚀环境下混凝土结构的耐久性,采用以配筋超高性能混凝土(UHPC)用作免拆模板加素填芯混凝土的技术思路,通过轴压实验研究了配筋UHPC用作免拆模板对短柱轴压力学性能的影响。结果表明,与破坏时海工混凝土柱出现大量的混凝土剥落和钢筋裸露不同,UHPC免拆模板柱的整体性良好,表面的UHPC仅出现少量剥落且钢筋不外露。同时,在等截面和相同配筋的情况下,UHPC免拆模板方柱和圆柱的开裂荷载明显高于高强海工混凝土方柱和圆柱的极限荷载,且分别达到其自身极限荷载的93%和88%。考虑到混凝土对钢筋的有效保护是影响海工混凝土结构耐久性的重要因素,配筋UHPC用作免拆模板这一思路在提高柱体的极限承载力、延性、刚度的同时还可以提高结构的开裂荷载、抗裂性能,有效地提高结构耐久性,适用于沿海工程。其中圆柱的力学性能提高幅度要远高于方柱,从配筋UHPC免拆模板的使用效果和施工便利性考虑,优选UHPC免拆模板圆柱。
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杨医博
杨凯越
吴志浩
林少群
丘广宏
燕哲
彭章锋
林燕姿
郭文瑛
王恒昌
关键词:  超高性能混凝土  免拆模板  短柱  轴压实验  氯盐环境  耐久性  方柱  圆柱    
Abstract: In order to enhance the concrete structure’s durability subjected to severe corrosion conditions such as splash zone, a solution was proposed which combines reinforced ultra-high performance concrete (UHPC) permanent template and core plain concrete. The mechanical influence of reinforced UHPC permanent template to short columns was investigated via axial bearing test. According to the experimental results, instead of spalling greatly and exposing concrete directly, UHPC permanent template columns displayed better integrity, only spalling slightly on UHPC’s surface and protecting the reinforcement well when destroyed. The crack bearing capacities of square and cylindrical UHPC permanent template columns reached 93% and 88% of the corresponding ultimate bearing capacities, respectively, which also exceed the ultimate bearing capacities of traditional high strength marine square/cylindrical columns with the same cross-sections and reinforcement arrangements. Considering that the effective concrete cover is one of the most crucial factors for structure durability, reinforced UHPC permanent template can improve ultimate bearing capacity, ductility, rigidity of the column, and moreover, the structure’s cracking load and cracking resistance, which effectively promoted durability and is applicable for marine projects. In comparison, cylindrical UHPC permanent template columns achieved larger mechanical improvements than square ones, and are more favorable in terms of mechanical behavior and construction convenience.
Key words:  ultra-high performance concrete    permanent template    short column    axial bearing test    chloride environment    durability    square column    cylindrical column
               出版日期:  2017-12-10      发布日期:  2018-05-08
ZTFLH:  TU375  
基金资助: *华南理工大学亚热带建筑科学国家重点实验室自主研究课题项目(2016KB14); 广东省水利科技创新项目(2017-22)
作者简介:  杨医博:男,1977年生,博士,副教授,硕士研究生导师,主要从事结构耐久性、高性能与超高性能混凝土、固体废弃物综合利用等研究 E-mail:yangyibo@scut.edu.cn
引用本文:    
杨医博, 杨凯越, 吴志浩, 林少群, 丘广宏, 燕哲, 彭章锋, 林燕姿, 郭文瑛, 王恒昌. 配筋超高性能混凝土用作免拆模板对短柱力学性能影响的实验研究*[J]. CLDB, 2017, 31(23): 120-124.
YANG Yibo, YANG Kaiyue, WU Zhihao, LIN Shaoqun, QIU Guanghong, YAN Zhe, PENG Zhangfeng, LIN Yanzi, GUO Wenying, WANG Hengchang. An Experimental Study on the Influence of Reinforced Ultra-high Performance Concrete Permanent Template to Short Column's Mechanical Property. Materials Reports, 2017, 31(23): 120-124.
链接本文:  
http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2017.023.017  或          http://www.mater-rep.com/CN/Y2017/V31/I23/120
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