Abstract
This study employed triaxial compression tests to investigate the deformation characteristics and damage evolution of construction and demolition waste (C&D) stabilized with alkali-activated fly ash (FA). Furthermore, the study explored the mechanisms of microcracks initiation, propagation, and the stress-strain behavior of stabilized C&D under varying stress conditions. A strain-softening damage model was employed to investigate the mechanism of damage evolution in the specimens. The test results revealed that the internal damage process of the stabilized recycled concrete aggregate (RCA) exhibited five stages: elastic recovery, damage initiation, damage acceleration, damage deceleration, and damage completion. The confining pressure had a significant influence on the deformation characteristics of the specimens. Additionally, the deformation characteristics of the stabilized C&D and rock materials exhibited remarkable similarities. By employing a model of rock strain softening and intrinsic structural damage the damage evolution trends and the equation of the intrinsic structure of the main component RCA-FA. The results demonstrated a good agreement between the test data and the predictions of the proposed constitutive model.
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Acknowledgments
The authors are thankful for the financial support from the National Natural Science Foundation of China (No. 52278347, No. U22A20232), the Key Research and Development Program of Hubei Province (2022BCA059) and Outstanding Person Fund of Hubei University of Technology (No. XJ2021000501).
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Li, L., Huang, C., Xiao, H. et al. Deformation Characteristics and Constitutive Model of Construction and Demolition Waste Stabilized with Alkali-Activated Fly Ash. KSCE J Civ Eng 28, 1194–1204 (2024). https://doi.org/10.1007/s12205-024-0560-3
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DOI: https://doi.org/10.1007/s12205-024-0560-3