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Article

Performance and Hydration Mechanism of Modified Tabia with Composite-Activated Coal Gangue

1
Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China
2
College of Civil Engineering & Mechanics, Xiangtan University, Xiangtan 411105, China
3
School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Dinadayalane Tandabany
Crystals 2022, 12(2), 150; https://doi.org/10.3390/cryst12020150
Received: 29 December 2021 / Revised: 17 January 2022 / Accepted: 18 January 2022 / Published: 21 January 2022
The feasibility of modified tabia (MT) with composite-activated coal gangue (CACG) as the subgrade material of low-grade highways was experimentally investigated. A composite activation method was employed to improve the pozzolanic activity of coal gangue. The effect of CACG content on the mechanical properties of MT was investigated through a series of experiments. It was found that the pozzolanic reactivity of coal gangue was remarkably enhanced by the composite activation method. Compared with traditional tabia (TT), the unconfined compressive strength, splitting strength, and flexural tensile strength of the MT with 50% of CACG content increased by 5.03 times, 9.71 times, and 1.50 times, respectively. The impermeability of specimens with CACG significantly improved. Furthermore, the mass loss rate of MT was less than 2.83%, while it reached up to 34.20% in TT after being conditioned to 40 freeze–thaw cycles. Finally, the microstructure change and hydration mechanism of MT are discussed and revealed. View Full-Text
Keywords: coal gangue; composite activation; modified tibia; hydration mechanism coal gangue; composite activation; modified tibia; hydration mechanism
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MDPI and ACS Style

Zhao, Y.; Yang, C.; Cheng, S.; Wu, Z.; Wang, B. Performance and Hydration Mechanism of Modified Tabia with Composite-Activated Coal Gangue. Crystals 2022, 12, 150. https://doi.org/10.3390/cryst12020150

AMA Style

Zhao Y, Yang C, Cheng S, Wu Z, Wang B. Performance and Hydration Mechanism of Modified Tabia with Composite-Activated Coal Gangue. Crystals. 2022; 12(2):150. https://doi.org/10.3390/cryst12020150

Chicago/Turabian Style

Zhao, Yanbing, Caiqian Yang, Songlin Cheng, Zhiren Wu, and Bokun Wang. 2022. "Performance and Hydration Mechanism of Modified Tabia with Composite-Activated Coal Gangue" Crystals 12, no. 2: 150. https://doi.org/10.3390/cryst12020150

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