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首页> 中文期刊> 《材料导报》 >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

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

         
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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栽明显高于高强海工混凝土方柱和圆柱的极限荷栽,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栽力、延性、刚度的同时还可以提高结构的开裂荷栽、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.%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/cylindri cal 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 im provements than square ones,and are more favorable in terms of mechanical behavior and construction convenience.

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