Work

Effect of Mine Water Environment on Durability of Solid Backfilling Based on Carbonated Coal-Based Waste

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide The durability of solid backfilling based on carbonated coal-based waste (CCBW) under mine water environments is critical for its engineering feasibility. This study investigates the deterioration mechanisms of CCBW exposed to acid solution (Acid W), alkaline solution (Alkaline W), and mine water (Mine W) through hydrochemical analysis, XRD, and SEM. Results reveal that the uniaxial compressive strength of CCBW decreased by 10.05, 3.93, and 1.62% after 28 days of immersion in the groups, respectively. Acid conditions induced CaCO 3 dissolution and gypsum formation, while alkaline environments triggered alkali–silica reaction expansion. Mine water exhibited minimal impact due to suspended particles mitigating ion exchange. Carbonation also enhanced the durability of CCBW by forming dense CaCO 3 clusters and C-A-S-H gels, thus reducing ion leaching. Notably, the average erosion resistance of carbonated samples (CCBW-5, 10, 30) was 2.32% higher than that of noncarbonated counterparts. These findings confirm the feasibility of CCBW applications in weakly alkaline mine water and highlight its potential for sustainable coal mining practices, aligning with carbon capture and circular economy principles.

Source: ACS Omega

DOI: 10.1021/acsomega.4c11495

Authors: Zhishang Zhang, Liqiang Ma, Ichhuy Ngo, Chengkun Peng, Jiangtao Zhai, Zezhou Guo

Institutions: China University of Mining and Technology, Xinjiang Institute of Engineering

Language: English

Topic: Tailings Management and Properties

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Responsible consumption and production, Clean water and sanitation, Climate action

Open Access status: gold

Estimated APC paid: $1,935