铅锌尾矿/电石渣基加气混凝土的组成及结构

doi:10.11896/cldb.23040266

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Abstract For comprehensive utilization of solid wastes, the autoclaved aerated concrete (AAC) was prepared using lead-zinc tailings and carbide slag. The effect of fineness and content of lead-zinc tailings on the properties of AAC, and the phase composition, microstructure, and autoclave reaction mechanism of AAC at different curing stages were investigated by macro and micro analysis methods. The results show that the fluidity of the slurry increases and the hydration reaction speed increases as the fineness of lead-zinc tailings decreases. However, if the fineness is too small, it is easy to cause the slurry to be too thick, affecting the formation and property of good pore structure of AAC. If the content of lead-zinc tailings is too large, the accumulation of unreacted residual particles of lead-zinc tailings in the system increases, and the gap between particles decreases, which affects the growth and crystallization of hydration products, leading to a decline in the properties of AAC products. When the specific surface area of lead-zinc tailings is 420 m²/kg and its content is 63wt%, the AAC is prepared with bulk density of 590 kg/m³ and compressive strength of 4.98 MPa, which meet the requirements of A3.5, B06 level of AAC produce regulated by ‘autoclaved aerated concrete block’ (GB/T 11968-2020). The main hydration products in the body before static maintenance are C-S-H gel and AFt. And then AFt decomposes, the hydration products change to be tobermorite and C-S-H gel after static maintenance and autoclaved.

Key words： lead-zinc tailings carbide slag autoclaved aerated concrete static maintenance tobermorite

Published: 25 July 2024 Online: 2024-08-12

CLC number:

TU522

Fund:National Key Research and Development Program of China (2021YFCI910605), the Natural Science Foundation of Hebei Province (E2020402079), Hebei Province and Technology Major Special Project (21283804Z), State Key Laboratoy of Solid Waste Resource Utilization and Energy Conservation (SWR-2023-007), Open Foundation of State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control (HB202306), Science and Technology Research and Development Plan of China Railway Construction Group Co., Ltd. (22-14b, 22-11b).

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	Articles by authors
	LIANG Baorui
	WANG Changlong
	PING Haoyan
	LIU Zhibing
	MA Jintao
	ZHENG Yongchao
	JING Jianlin
	QI Yang
	ZHAI Yuxin
	LIU Feng

Cite this article:

LIANG Baorui,WANG Changlong,PING Haoyan, et al. Composition and Structure of Autoclaved Aerated Concrete Containing Leading-Zinc Tailings and Carbide Slag[J]. Materials Reports, 2024, 38(14): 23040266-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23040266 OR http://www.mater-rep.com/EN/Y2024/V38/I14/23040266

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