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Cracking-Resistance Mechanism of Fiber-Reinforced Coal-Based Solid-Waste Grouting Materials
Shuai Guo1, Weifeng Liang2, Xiangru Wu1
1School of Mines, China University of Mining & Technology, Xuzhou 221116, China.
Materials (Basel, Switzerland)
|January 28, 2026
Summary
Fiber-modified coal-based solid-waste grouting (F-CWG) materials enhanced crack resistance and pore structure. Sulfoaluminate cement (SAC) and fiber content optimization improves mechanical strength for sustainable mining applications.
Area of Science:
- Geotechnical Engineering
- Materials Science
- Civil Engineering
Background:
- Grouting is vital for aquifer stability but faces challenges with material strength and crack resistance.
- The mechanisms of fiber reinforcement and sulfoaluminate cement (SAC) in coal-based solid-waste grouts are not fully understood.
Purpose of the Study:
- To investigate the effects of SAC and fiber addition on the properties of coal-based solid-waste grouting (F-CWG) materials.
- To elucidate the mechanisms of pore refinement and crack resistance in F-CWG.
Main Methods:
- Preparation of F-CWG materials with varying SAC and fiber content.
- Analysis using mechanical property tests, SEM/EDS, XRD, TGA, and NMR.
Main Results:
- Mechanical strength initially decreased then increased with higher SAC content due to ettringite (AFt) and C-S-H formation.
- 0.6% fiber dosage generally improved strength and pore structure, with PVA and steel fibers being most effective.
- Identified mechanisms enhancing cracking resistance in F-CWG materials.
Conclusions:
- Optimized F-CWG materials offer improved mechanical strength and crack resistance.
- Findings provide a scientific basis for grouting in water-preservation mining and enhance coal-based solid waste utilization.
Keywords:
coal ganguecracking resistancefiber reinforcementgrouting materialmechanismperformance analysissolid wasteMore Related Videos
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