Performance Enhancement of Coal Gangue Aggregates through Chemical Composite Treatments

DOI

10.2991/978-94-6463-726-7_62How to use a DOI?

Keywords

Coal gangue aggregate; Composite modification treatment; Physical and mechanical properties; Microstructure; Modification mechanism

Abstract

Coal gangue, a waste from coal mining, presents significant environmental challenges but has the potential to mitigate the environmental impact of conventional construction materials when used as coarse aggregate in concrete. This study explores its chemical modification with sodium silicate, calcium chloride, and surfactants. Results show a 39.8% reduction in crushing value and a 16.7% decrease in water absorption. Microscopic analysis confirms the formation of calcium silicate hydrate (C-S-H) and silica gel, enhancing strength and bonding. Chemically modified coal gangue offers a low-carbon, sustainable alternative for concrete, supporting resource recycling and lowering the construction industry’s carbon footprint.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Yu Zhang
AU  - Xiangdong Zhang
AU  - Zong Li
PY  - 2025
DA  - 2025/06/13
TI  - Performance Enhancement of Coal Gangue Aggregates through Chemical Composite Treatments
BT  - Proceedings of the 2024 6th International Conference on Hydraulic, Civil and Construction Engineering (HCCE 2024)
PB  - Atlantis Press
SP  - 616
EP  - 622
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-726-7_62
DO  - 10.2991/978-94-6463-726-7_62
ID  - Zhang2025
ER  -