Title:
Study of the Fatigue Performance and Damage Mechanism
of Steel Fiber Reinforced Concrete
Author(s):
Sun Wei, Gao Jianming, and Yan Yun
Publication:
Materials Journal
Volume:
93
Issue:
3
Appears on pages(s):
206-212
Keywords:
damage; fatigue (materials); fatigue tests; fiber reinforced con-cretes;
silica fume.
DOI:
10.14359/9804
Date:
5/1/1996
Abstract:
In this paper the effects of the volume fraction of steel fiber amount of silica fume, and their composite on fatigue performance and the mechanism of fatigue damage are investigated. The fatigue equations of steel fiber reinforced concrete and reinforced high-strength concrete are presented. Test results show that the effect of volume fraction and length diameter ratio on fatigue performance of concrete is extremely prominent. When silica fume, steel fiber and their composite are added to high-strength concrete, since the effects of the two of the nucleation and pozzolanic reaction of silica fume are in the cement matrix, and the effects of steel fiber on the strengthening, toughening, and crack arresting in the composite, the interfacial structure of both the fiber cement matrix and aggregate cement matrix is strengthened. The space superimposing of the effects of the two of the fiber-cement matrix and aggregate-cement matrix appear in the fiber reinforced composite. The double effect of interfacial strengthening and space superimposing of the fiber-cement matrix and aggregate-cement matrix is produced and the interfacial structure and character are improved, the process of strengthening, vanishing, and restrengthening of the interface is caused, and the dimension and the amount of crack sources are reduced, thus delaying crack extension and propagation and the process of fatigue damage, evidently prolonging fatigue life.