INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Bonding Properties of Interface in Ordinary Concrete Repaired by Alkali-Activated Material |
ZHU Hongguang*, HOU Jinliang, SHI Jing, GE Jieya, LYU Wei, YANG Sen, LI Zonghui, SHEN Zhengyan
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School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China |
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Abstract In this work, the effect of alkali-activated slag fly ash (AASFA) on the mechanical properties and chloride penetration resistance of concrete bonding surface was studied. The splitting tensile strength and the chloride ion diffusion coefficient of the bonding surface repaired through three methods are compared and analyzed, which are direct repairing with ordinary concrete (the method C), brushing the interface agent using cement or AASFA paste before repairing with ordinary concrete (the method J) and direct repairing with AASFA concrete (the method S). The results show that AASFA repairing concrete (the method S) with alkali activator modulus of 1.3 has the best effect among the three methods. There is a good correlation between the splitting tensile strength and the chloride penetration resistance of the bonding surface repaired through method S. The two properties are first enhanced, then weakened with the increase of slag content, and reach the strongest when the contents of slag and fly ash account for 50% respectively. After repairing with alkali activated material, under the action of alkali activator, the hydration pro-ducts of slag fly ash and old concrete cement influence each other to promote the reaction, and the generated material improves the mechanical properties and chloride ion penetration resistance of the bonding surface.
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Published: 25 August 2022
Online: 2022-08-29
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Fund:Beijing Municipal Natural Science Foundation (8164061), National Natural Science Foundation of China (51578539), Outstanding Youth Project of Basic Scientific Research Funds for the Central Universities (2020YQLJ03), and Yueqi Young Scholar of China University of Mining and Technology (Beijing) (800015Z11A23). |
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