Compressive Fatigue Investigation on High-Strength and Ultra-High-Strength Concrete within the SPP 2020

被引:12
|
作者
Basaldella, Marco [1 ]
Jentsch, Marvin [1 ]
Oneschkow, Nadja [1 ]
Markert, Martin [2 ]
Lohaus, Ludger [1 ]
机构
[1] Leibniz Univ Hannover, Inst Bldg Mat Sci, Appelstr 9a, D-30167 Hannover, Germany
[2] Univ Stuttgart, Mat Testing Inst, Pfaffenwaldring 4d, D-70569 Stuttgart, Germany
关键词
high-strength concrete; ultra-high-strength concrete; compressive fatigue resistance; strain development; stiffness development; DESIGN CONCEPT; BEHAVIOR; DAMAGE;
D O I
10.3390/ma15113793
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The influence of the compressive strength of concrete on fatigue resistance has not been investigated thoroughly and contradictory results can be found in the literature. To date, the focus of concrete fatigue research has been on the determination of the numbers of cycles to failure. Concerning the fatigue behaviour of high-strength concrete (HPC) and, especially, ultra-high-strength concrete (UHPC), which is described by damage indicators such as strain and stiffness development, little knowledge is available, as well as with respect to the underlying damage mechanisms. This lack of knowledge has led to uncertainties concerning the treatment of high-strength and ultra-high-strength concretes in the fatigue design rules. This paper aims to decrease the lack of knowledge concerning the fatigue behaviour of concrete compositions characterised by a very high strength. Within the priority programme SPP 2020, one HPC and one UHPC subjected to monotonically increasing and cyclic loading were investigated comparatively in terms of their numbers of cycles to failure, as well as the damage indicators strain and stiffness. The results show that the UHPC reaches a higher stiffness and a higher ultimate strain and strength than the HPC. The fatigue investigations reveal that the UHPC can resist a higher number of cycles to failure than the HPC and the damage indicators show an improved fatigue behaviour of the UHPC compared to the HPC.
引用
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页数:17
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