Materials Reports 2021, Vol. 35 Issue (z2): 218-223 |
INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Study on Mechanics and Durability of Coal Gangue Coarse Aggregate-Geopolymer Concrete |
GE Jieya, ZHU Hongguang, LI Zonghui, LI Weijian, SHEN Zhengyan, HOU Jinliang, YANG Sen
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School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China |
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Abstract The original and calcined coal gangue coarse aggregates were replaced with different amounts of crushed stone, respectively, to prepare coal gangue coarse aggregate-geopolymer concrete. Through experiments, the influences of the content of gangue and whether it was calcined or not on the compressive strength, chloride ion permeability and freezing-thawing resistance of concrete for 28 d were analyzed, and the correlation between the performance indexes of concrete, the appropriate content of gangue coarse aggregate and the necessity of calcination were explored. In addition, The internal mechanism was discussed by means of the scanning electron microscope(SEM). The results show that with the increase of the amount of coal gangue coarse aggregate, the compressive property, impermeability and freezing-thawing resistance of coal gangue coarse aggregate geopolymer concrete will be weakened to different degrees, among which the freezing-thawing resistance is the most significant. Compared with the raw gangue coarse aggregate ground polymer concrete, the calcined gangue coarse aggregate ground polymer concrete with the same coal gangue content shows great advantages in compressive strength, the chloride ion permeability resistance of the raw gangue ground polymer concrete is not as good as that of the original gangue ground polymer concrete, and the frost resistance of the raw gangue ground polymer concrete is not much different from that of the original coarse aggregate.
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Published: 09 December 2021
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Fund:This work was financially supported by 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),Yueqi Young Scholar of China University of Mining and Technology (Beijing). |
About author:: Jieya Ge, studied in structural engineering of China University of Mining and Technology (Beijing) from September 2019, majored in the research of concrete durability. Hongguang Zhu, associate professor of China University of Mining and Technology (Beijing), Yueqi Young Scholar, Beijing-level virtual simulation experiment project leader. In 2012, he graduated from the China University of Mining and Technology (Beijing) majoring in engineering mechanics and has stayed in the school. He has published more than 50 papers in academic journals at home and abroad, and obtained 8 national invention and utility model patents. The research direction is mainly the digital design and long-term performance research of solid waste concrete. Presided over and participated in 3 major national basic research and development projects, 2 National Natural Science Foundation of China, 1 Beijing Natural Science Foundation Youth Project, 1 Beijing New Wall Material Special Fund Support Project, 3 National Key Laboratory Open Projects, etc. |
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