Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 151, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2021.106378
Keywords
Flexural fatigue; Micro-cantilever bending; Cement paste; SEM; Viscoelasticity
Funding
- China Scholarship Council, China [201706130140, 201808320456, 201708110187]
- Taishan Scholar Foundation of Shandong Province, China [tsqn201909032]
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The study investigates the fatigue properties of cement paste at the microscale, revealing a strong size dependence in flexural fatigue life. Despite the presence of a higher density of nano-scale cracks during fatigue loading compared to static fracture, fatigue damage evolution is slow and small even under high stress levels. Residual deformation in cement paste is attributed to the interaction of viscoelastic deformation and fatigue cracking growth.
This study presents an experimental investigation of fatigue properties of cement paste at the microscale. A strong size dependence is found for the flexural fatigue life of the cement paste specimen. Microscopic observations on the fractured surfaces suggest that there is a higher density of nano-scale cracks generated during the fatigue loading compared to the static fracture. However, the fatigue damage evolution is found to be very slow and small even under high stress levels. The development of residual deformation for cement paste can be explained by the combined effects of viscoelastic deformation and fatigue cracking growth.
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