高应变强化超高性能混凝土的裂缝控制机理和研究
发布时间：2018-11-13 07:47
【摘要】：利用声发射无损探伤技术实时监测三种类型超高性能混凝土(Ultra High Performance Concrete,简称UHPC)轴拉试验过程中内部损伤点的形成和演化过程,同时通过裂缝观测仪量测UHPC拉应变到达2000με时的缝宽。与低应变强化UHPC和应变软化UHPC相比,高应变强化UHPC具有高抗拉强度和"类金属"拉伸应变强化性能,在强化段区间内通过多点微裂纹均布开展的形式来平衡等量变形,表现出优异的裂缝宽度控制能力。气体渗透测试证明高应变强化UHPC抗气渗性能优异,且拉应变达到2000με后即刻卸载状态下的抗气渗性能仍要优于未受荷C50混凝土。基于高应变强化UHPC这些特性,将其应用于桥梁结构的高应力区或其他需要高抗裂性能的部位将是预应力混凝土之外的新方案,例如钢-UHPC轻型组合结构、斜拉桥的桥塔锚固区。
[Abstract]:The formation and evolution of internal damage points during axial tensile test of three types of ultra-high performance concrete (Ultra High Performance Concrete,) are monitored by acoustic emission nondestructive flaw detection (AE NDT) in real time. At the same time, the crack width is measured when the tensile strain of UHPC reaches 2000 渭 蔚. Compared with low strain hardening UHPC and strain softening UHPC, high strain strengthened UHPC has high tensile strength and "metal-like" tensile strain strengthening performance. Show excellent crack width control ability. Gas permeation test shows that the gas permeability resistance of high strain strengthened UHPC is superior to that of unloaded C50 concrete when tensile strain reaches 2000 渭 蔚. Based on the characteristics of high strain strengthened UHPC, applying it to the high stress zone of bridge structure or other parts requiring high crack resistance will be a new scheme other than prestressed concrete, such as steel-UHPC light composite structure, cable-stayed bridge tower anchoring area.
【作者单位】： 同济大学先进土木工程材料教育部重点实验室;同济大学土木工程学院;上海市政工程设计研究总院(集团)有限公司;上海罗洋新材料科技有限公司;
【基金】：上海市浦江人才计划(16PJ1409900) 国家自然科学基金青年项目(51609172) 上海市科委项目(17DZ1204200)
【分类号】：U444
本文编号：2328467
[Abstract]:The formation and evolution of internal damage points during axial tensile test of three types of ultra-high performance concrete (Ultra High Performance Concrete,) are monitored by acoustic emission nondestructive flaw detection (AE NDT) in real time. At the same time, the crack width is measured when the tensile strain of UHPC reaches 2000 渭 蔚. Compared with low strain hardening UHPC and strain softening UHPC, high strain strengthened UHPC has high tensile strength and "metal-like" tensile strain strengthening performance. Show excellent crack width control ability. Gas permeation test shows that the gas permeability resistance of high strain strengthened UHPC is superior to that of unloaded C50 concrete when tensile strain reaches 2000 渭 蔚. Based on the characteristics of high strain strengthened UHPC, applying it to the high stress zone of bridge structure or other parts requiring high crack resistance will be a new scheme other than prestressed concrete, such as steel-UHPC light composite structure, cable-stayed bridge tower anchoring area.
【作者单位】： 同济大学先进土木工程材料教育部重点实验室;同济大学土木工程学院;上海市政工程设计研究总院(集团)有限公司;上海罗洋新材料科技有限公司;
【基金】：上海市浦江人才计划(16PJ1409900) 国家自然科学基金青年项目(51609172) 上海市科委项目(17DZ1204200)
【分类号】：U444
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