Development of an Aerated Sulfoaluminate Cement–Based Material for Coal Mine Filling
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 2
Abstract
Coal mine filling requires a safe, lightweight, and high-strength filling material, but current commonly used aeration agents, such as hydrogen peroxide, which produces the combustible gas , and aluminum powder, which produces the explosive gas , are not suitable for coal mine filling. In this paper, a new inorganic composite aeration agent, namely sodium bicarbonate and potassium aluminum sulfate, which produces inert gas , was developed. The effects of this composite aeration agent admixture (at contents of 0%, 2%, 4%, 6%, and 8%) on the properties such as fluidity, setting time, compressive strength, and water resistance of sulfoaluminate cement paste with high water-to-cement ratios were investigated systematically. The evolution of the microstructure and pore structure of this foamed material was determined using X-ray diffraction (XRD), thermogravimetric and differential thermal analysis (TG-DTA), and scanning electron microscopy (SEM). The results showed that when the amount of aeration agent was 8%, the 7-day compressive strength of the prepared sulfoaluminate cement–based foamed material with a dry density of was 1.2 MPa. Compared with the control group, the setting time was shortened by 87%, dry density was reduced by 42.1%, 7-day compressive strength was increased by 47.5%, and water resistance was increased by 45.4%. The composite admixture not only formed uniform bubbles within the sulfoaluminate cement paste but also produced in situ calcium carbonate, which promoted the hydration of sulfoaluminate cement and made the microstructure of the hardened paste denser. The results provide new materials for coal mine foam filling, which can be applied to corner gas control and foam filling in mining areas and coal mine fire prevention.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The support from the National Natural Science Foundation of China (U1905216), the National Key R&D Program of China (2017YFC0603004), and Henan Polytechnic University are appreciated.
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Journal of Materials in Civil Engineering
Volume 35 • Issue 2 • February 2023
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© 2022 American Society of Civil Engineers.
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Received: Dec 29, 2021
Accepted: May 31, 2022
Published online: Dec 5, 2022
Published in print: Feb 1, 2023
Discussion open until: May 5, 2023
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