High-Frequency Fatigue Performance of Cracked Mortar after Epoxy Grouting Reinforcement
Publication: International Journal of Geomechanics
Volume 19, Issue 5
Abstract
This paper presents the experimental study on the influence of grouting reinforcement on the fatigue behavior of cracked cement mortar under different stress ratio and levels. The compressive fatigue tests were conducted with a loading frequency of about 150 Hz. The fatigue life decreased logarithmically with the increase of the stress level, and the fatigue life threshold increased with the increase of the stress ratio. The pores near the fracture were effectively strengthened after the grouting reinforcement. The initial fatigue crack of the sample was initiated at the original crack tip when the lateral deformation reached its threshold value. A double logarithmic fatigue equation was introduced to delineate the fatigue equation. Considering the influence of stress level and stress ratio, a damage evolution equation was proposed to describe the damage evolution process. The fitting results agreed well with the test data.
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Acknowledgments
This research is supported by the National Natural Science Foundation of China (Grant 51404212), the Foundation for University Key Teacher by the He’nan Educational Committee (Grant 2016GGJS-002), and the program of China Scholarships Council (Grant 201608410176). The fourth author acknowledges the financial support from the China Scholarship Council under 201406370141.
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Published In
International Journal of Geomechanics
Volume 19 • Issue 5 • May 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: May 8, 2018
Accepted: Nov 26, 2018
Published online: Mar 11, 2019
Published in print: May 1, 2019
Discussion open until: Aug 11, 2019
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