| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Relationship Between Bond Strength of Concrete Interface and Meso-mechanical Properties of Interface Transition Zone Under Freezing-thawing Action of Deicing Salt |
| ZHU Benqing1, YU Hongfa2,*, GONG Xu3, WU Chengyou1,3,*, MA Haiyan2
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1 School of Civil Engineering, Qinghai University, Xining 810000, China
2 Department of Airport and Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
3 Qinghai Provincial Key Laboratory of Building Energy-saving Materials and Engineering Safety, Xining 810000, China |
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Abstract Interfacial transition zone (ITZ) is the concrete internal structure of the weak link, it is also a channel for external erosive ions to diffuse and penetrate inward. In this work, the macroscopic and meso-mechanical properties of concrete interface under freezing-thawing environment of deicing salt were studied by rapid freezing-thawing experiment. The results show that the interface bond strength and ITZ microhardness of concrete aggregate and mortar show a typical two-stage linear change during the salt freezing process. The initial strengthening stage increased with the increase of salt freezing cycles and the later deterioration stage decreased with the increase of salt freezing cycles. The initial interface bond strength or ITZ microhardness will decrease with the increase of water-binder ratio, the initial strengthening rate will slow down, and the later deterioration rate will accelerate. The concrete with lower water-binder ratio has better salt freeze resistance. There is an obvious correlation between the bonding strength and ITZ microhardness of coarse aggregate in concrete during salt-freezing process. It provides basic data for meso-mechanical analysis of concrete in salt-frozen environment.
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Published: 10 March 2024
Online: 2024-03-18
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| Fund:National Natural Science Foundation of China (21276264) and Natural Science Foundation of Qinghai Province (2022-ZJ-707). |
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2024, Vol. 38 
