Tensile characteristics and fracture energy of fiber reinforced and non-reinforced ultra high performance concrete (UHPC)
Tensile characteristics and fracture energy of fiber reinforced and non-reinforced ultra high performance concrete (UHPC)
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DOI：
10.1007/s10704-014-9951-7
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发表时间：
2014-06
影响因子：
2.5
通讯作者：
K. Voit;Johannes Kirnbauer
中科院分区：
文献类型：
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作者：
K. Voit;Johannes Kirnbauer
在本研究的框架内，生产和测试了纤维增强和非增强超高性能混凝土（UHPFRC和UHPC）的各种混合物，重点是确定断裂能及其与标准力学材料参数的比较。有些混合物的抗压强度达到300 MPa以上，但仍保持了UHPC的良好新鲜特性。研究了这些混合物的新混凝土和硬化混凝土的性能，重点是抗拉强度和断裂能。断裂能用来描述材料的工作能力，即材料失效前的势能摄入。因此，加入钢纤维可以显著提高其做功能力。此外，还研究了真空处理新拌混凝土对新拌混凝土和硬化混凝土特性的影响，以及后处理（热处理和蓄水）对UHPC压缩和拉伸性能的影响。
In the framework of this study, various mixtures of fiber reinforced and non-reinforced ultra high performance concrete (UHPFRC and UHPC) were produced and tested with focus on the determination of the fracture energy and its comparison to standard mechanical material parameters. For some mixtures a compressive strength of more than 300 MPa was reached still retaining good fresh characteristics of the UHPC. These mixtures were examined for properties of fresh and hardened concrete, focusing on tensile strength properties and fracture energy. The fracture energy was determined to describe the work capacity, i.e. the potential energy intake until the failure of the material. Thereby, a significant increase of the work capacity could be achieved by the addition of steel fibers. Furthermore, the impact of a vacuum treatment of the freshly mixed concrete in regard to fresh and hardened concrete characteristics as well as the influence of aftertreatment (heat treatment and water storage) on compressive and tensile properties of the UHPC was investigated.