煤矸石细集料-矿渣混凝土抗压强度与抗冻性能研究

doi:10.11896/cldb.20080019

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Abstract The concrete with different water cement ratio was prepared with slag as binder material and coal gangue as fine aggregate. The effects of water binder ratio, slag content and coal gangue content on the compressive strength and frost resistance of concrete was studied through orthogonal experiments, and the influence of microscopic mechanism on the mechanical properties was discussed. Results showed that the water binder ratio and slag content had a significant effect on the compressive strength, and the effect of coal gangue as fine aggregate was small. The slag and coal gangue content had a significant effect on the frost resistance of concrete, and the effect of water binder ratio was small. In order to improve the compressive strength and frost resistance comprehensively, the optimal mix proportion was water binder ratio as 0.4—0.45, 30% slag content, and 30% coal gangue as fine aggregate. Moreover, the fractal dimension of the scanning electric morphology (SEM) was calcula-ted based on fractal theory. Results showed that the fractal dimension of coal gangue/slag concrete was negatively related to the strength.

Key words： orthogonal test compressive strength frost resistance comprehensive performance SEM fractal dimension

Published: 25 November 2021 Online: 2021-12-13

CLC number:

TU58+2

Fund:National Natural Science Foundation of China(51578539).

About author: 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. He 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.
Qingjie Huostudied in structural engineering of China University of Mining and Technology (Beijing) from September 2018 to July 2021, majored in the research of concrete durability.

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	ZHU Hongguang
	HUO Qingjie
	NI Yadong
	XU Xiaonan
	HANG Zetao
	WANG Tao
	YANG Sai

Cite this article:

ZHU Hongguang,HUO Qingjie,NI Yadong, et al. Study on Compressive Strength and Frost Resistance of Coal Gangue Fine Aggregate-Slag Cement-based Concrete[J]. Materials Reports, 2021, 35(22): 22085-22091.

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http://www.mater-rep.com/EN/10.11896/cldb.20080019 OR http://www.mater-rep.com/EN/Y2021/V35/I22/22085

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