Freeze-Thawing Damage Model of New-to-Old Concrete with Different Rough Interfaces

Abstract:

New-to-old concrete freeze-thawing durability affects the safety and normal service of structure. In this paper, the freeze-thawing resistance of new-to-old concrete with different rough substrate surfaces was studied. The roughness of substrate surface was characterized by fractal dimension. Test results show that freeze-thawing damage of new-to-old concrete has two stage changes: first stage, freeze-thawing damage increases rapidly, mainly caused by the damage of interface; second stage, freeze-thawing damage increases slower, mainly reflects damage of substrate and overlay. Compared with smooth surface, rough surface can significantly improve freeze-thawing resistance of new-to-old concrete. In a certain range, with the increase of fractal dimension, the freeze-thawing resistance improves. When the fractal dimension is beyond the range, the freeze-thawing resistance impairs while the fractal dimension increases. A freeze-thawing damage model applied to new-to-old concrete is proposed, and a good correlation is found between the model and experimental results.

• Periodical: Applied Mechanics and Materials (Volumes 405-408)
• Pages: 2707-2714
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.405-408.2707
• Online since: September 2013
• Authors: Cheng Yi, Su Ling Lai, Hong Guang Zhu, Shi Hong Yan, Jian Xia Liu, Xin Dong
• Keywords: Fractal Dimension, Freeze-Thawing Damage, New-To-Old Concrete, Resistance to Freeze-Thawing, Rough Surface

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