钢纤维对玄武岩纤维编织网增强混凝土板双向弯曲性能的影响

摘要

为了研究钢纤维对玄武岩纤维网格布增强混凝土方板双向受弯性能的影响,借鉴欧洲EFNARC标准,利用四边简支方板试验,分别对素混凝土方板、玄武岩纤维网格布增强混凝土方板、钢纤维增强混凝土方板及钢纤维与玄武岩纤维网格布混杂增强混凝土方板的弯曲性能进行研究,同时与传统钢筋网混凝土方板的弯曲性能进行对比,分析了网格布对混凝土方板的双向增强效果,探讨了钢纤维与玄武岩纤维网格布混杂使用代替传统钢筋网的可行性.结果表明:玄武岩纤维网格布可以改善方板的内力重分布,显著提高其承载力,但是破坏时脆性特征明显;钢纤维与玄武岩纤维网格布混杂使用表现出显著的正混杂效应,方板的韧性明显提高;在正常使用极限状态下,30kg/m3的钢纤维与玄武岩纤维网格布混杂方板的弯曲性能高于传统钢筋网混凝土方板,说明钢纤维与玄武岩纤维编织网混杂使用可以代替传统钢筋网.%In order to investigate the influence of steel fibers on the biaxial bending properties of basalt fiber textile reinforced concrete, two-way slab test in accordance with EFNARC was introduced.The biaxial flexural properties of the basalt fiber textile reinforced concrete slab, the steel fiber reinforced concrete slab and the combined use of steel fiber and basalt fiber textile reinforced slab were compared.The slab without any reinforcement and the conventional steel mesh reinforced concrete slab were also studied as reference.The biaxial reinforcement of the basalt fiber mesh was analyzed and the feasibility of using steel fiber and basalt fiber mesh to replace the conventional steel mesh was studied.The results show that the inner force redistribution and the ultimate load of the slab increase obviously with the addition of the basalt fiber mesh, but the failure pattern of the slab still demonstrate brittle feature.The combined use of steel fiber and basalt fiber mesh illustrates positive hybrid effect, the toughness of the slab increases significantly.In the serviceability stage, the flexural properties of the slab reinforced with 30 kg/m3 steel fiber and basalt fiber mesh are higher than the conventional steel mesh reinforced slab, it means that the conventional steel mesh can be replaced by the combined use of the steel fiber and the basalt fiber mesh.