施工技术2015年12月下 22CONSTRUCTION TECHNOLOGY第44卷第24期 DO1:10. 7672/sgjs2015240022 钢纤维对超高性能水泥基复合材料增强增韧的影响*
朋改非,牛旭婧,赵怡琳 (北京交通大学土木工程学院,北京100044) [摘要]为研究钢纤维对超高性能水泥基复合材料(UHPCC)增强增韧性能的影响,对掺加不同类型、掺量和排列方 式钢纤维的UHPCC直接拉伸性能和弯曲韧性进行研究。
结果表明,钢纤维明显提高UHPCC的直接拉伸性能和弯 曲韧性。
纤维掺量越高,增强增韧效果越明显;相同掺量下,波纹型钢纤维的增强增韧效果优于端钩型,这是由于 波纹型钢纤维与基体间存在更强的机械咬合力。
此外,沿拉应力方向有序排列钢纤维的方式更有利于UHPCC的 增强增韧,表现为破坏过程呈现一定的应变硬化特征。
[关键词]超高性能水泥基复合材料;波纹型钢纤维;端钩型钢纤维;抗拉强度;断裂能 【中图分类号】TU528.58「文献标识码]A[文章编号〕1002-8498(2015)24-0022-05 InfluenceofSteelFibersonStrengtheningandTougheningof Ultra High Performance Cementitious Composites Peng Gaifei,Niu Xujing,Zhao Yilin (Faculty of Civil Engineering,Bejing Jiaotong University,,Beijing100044,China) Abstract:Based on the experirmental results of tensile loading and bending toughness testing of ultra high performance cemcntitious posites(UHPCC) incorporating steel fiber of different types,dosages and arrangement, the influence of steel fibers on strengthening and toughening of UHPCC were studied. The results indicate that the addition of steel fiber can significantly improve both tensile and bending toughness properties of UHPCC. The higher the dosage of steel fiber, the better the effect of strengthening and toughening is. Notably, the effect of crimped steel fiber on strength and toughness of UHPCC is more efficient than that of hooked steel fiber, which should be caused by the more pronounced mechanical
the orderly arrangement of steel fiber along the direction of tensile stress provides a better performance Key words:ultra high performance cementitious posites; crimped steel fiber; hooked steel fiber; tensile strength; fracture energy 近年来,随着我国基础工程大规模兴建、城镇混凝土增强增韧的一种重要手段。
杨久俊等研 化速度加快,超高性能水泥基复合材料(ultrahigh究发现,掺加波纹型钢纤维的超高强混凝土相对韧 performance cementitious posites,UHPCC)凭借其性和断裂能分别比基准组提高1倍和34倍。
杜修 极高的抗压强度、优良的抗冲击、抗疲劳性能和力等"指出掺加体积率2%的端钩型钢纤维时,超 极佳的耐久性,被广泛应用到建筑结构领域,并高强混凝土的韧性指数和剩余强度因子均超过理 取得良好的社会经济效益。
然而,随着抗压强度的想弹塑性材料指标。
PARK等探讨了混杂钢纤维 提高,UHPCC的脆性特征变得更加明显,其脆性破(粗+细纤维)对超高性能混凝土拉伸性能的影响,
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