Modification Effect of Fly Ash on Interfacial Transition Zone of Coal Gangue Concrete
QIU Jisheng1,*, ZHU Mengyu1, ZHOU Yunxian1, GAO Xujun2, LI Leilei2
1 School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China 2 Power China Northwest Survey Design and Research Institute Co., Ltd., Xi'an 710065, China
Abstract: In order to promote the use of coal gangue in the concrete production, the influence of different fly ash content (0%, 10%, 20%, 30%, 40%) on the structure of interfacial transition zone (ITZ) of coal gangue concrete (CGC), from two dimensions of macromechanics and micromechanics, revealed the modification mechanism of fly ash on microstructure and macroscopic properties of ITZ of CGC. Research shows that: in macroscopic mechanics, the splitting tensile strength of CGC could be improved by adding 30% fly ash. In micromechanics, 30% fly ash could significantly improve the hardness value of weak zone of ITZ, and made the hardness value became more uniform. When fly ash was added, the thickness of ITZ decreased obviously. This indicated that the appropriate fly ash has played a physicochemical role in the ITZ of CGC and changed the structure of ITZ.
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2023, Vol. 37 
