台湾钢纤维混(喷)凝土应用现况与展望.pdfVIP

台湾钢纤维混(喷)凝土应用现况与展望 TheCurrent andProspectiveApplicationsof SteelFiber ReinforcedConcrete/ShotcreteinTaiwan 张吉佐1 刘弘祥2 Chi-TsoChang Hong-ShiangLiu 摘 要 传统混(喷)凝土具有良好的耐压能力，但是对于抗拉、抗弯及韧性等方面较 弱。若在混(喷)凝土中加入少量钢纤维、强塑剂及 卜作岚细粉等即能改进上述缺 点；并有以下优点︰减少干缩量，避免裂缝产生，提高疲劳强度，增加阻抗磨损 能力，减少冲击损伤，韧性佳，抗震力强。另就设计及施工性而言，钢纤维可取 代大部份钢筋及钢线网，减少铺设钢筋及钢线网的时间及混(喷)凝土的厚度。本 文除了简要说明钢纤维混 （喷）凝土的力学特性及组成材料性质之外，并列举台 湾钢纤维混 （喷）凝土应用实例及展望，以供相关工程参考。 Abstract The conventional concrete/shotcrete has excellent ability in withstanding compression, but it has comparatively poor performances in tensile strength, flexure strength and ductility. These disadvantages can be significantly improved if the concrete/shotcrete mix composition is incorporated by adding an appropriate proportion of steel fiber, superplasticizer and pozzolans. This reinforcement could have the following advantages ：to transfer brittle into ductility, to achieve a considerable flexural strength,to eliminate dry shrinkage,to suppress thepropagation of cracking, to raise persistence to against fatigue, to create high abrasion resistance, to decrease impact damage and to provide with a remarkable engergy absorption to shock caused by seismic forces. From the design and construction point of view, some cases, steel fiber can completely or partially replace both rebar and wire mesh .Meantime, the thickness of concrete/shotcrete can be substantially reduced. This can greatly save the materials and the time for setting up the placement of rebar or wire mesh during construction. This paper, beside briefly explains the mechanical and dynamic properties of steel fiber reinforced concrete/shotcrete and the characteristics of the composition materials, also illustrates with current and prospectiveapplicationsof steel fiberreinforced concrete/shotcretei