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Advances in Materials Science and Engineering
Volume 2017, Article ID 3419801, 13 pages
https://doi.org/10.1155/2017/3419801
Research Article

Experimental Study and Application of Inorganic Solidified Foam Filling Material for Coal Mines

Hu Wen,1,2,3 Duo Zhang,1,2,3 Zhijin Yu,1,2,3 Xuezhao Zheng,1,2,3 Shixing Fan,1,2,3 and Bin Laiwang4

1School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, China
2Key Laboratory of Mine and Disaster Prevention and Control of Ministry of Education, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, China
3Xi’an Research Center National Mine Rescue, Xi’an, Shaanxi 710054, China
4Doctoral Program, Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, 123 University Rd., Sec. 3, Douliou, Yunlin 64002, Taiwan

Correspondence should be addressed to Duo Zhang; nc.ude.tsux.uts@140215102b

Received 25 April 2017; Revised 23 June 2017; Accepted 10 July 2017; Published 10 August 2017

Academic Editor: Prinya Chindaprasirt

Copyright © 2017 Hu Wen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Spontaneous combustion of residual coal in a gob due to air leakage poses a major risk to mining safety. Building an airtight wall is an effective measure for controlling air leakage. A new type of inorganic solidified foam-filled material was developed and its physical and chemical properties were analyzed experimentally. The compressive strength of this material increased with the amount of sulphoaluminate cement. With an increasing water–cement ratio, the initial setting time was gradually extended while the final setting time firstly shortened and then extended. The change in compressive strength had the opposite tendency. Additionally, as the foam expansion ratio increased, the solidification time tended to decrease but the compressive strength remained approximately constant. With an increase in foam production, the solidification time increased and the compressive strength decreased exponentially. The results can be used to determine the optimal material ratios of inorganic solidified foam-filled material for coal mines, and filling technology for an airtight wall was designed. A field application of the new material demonstrated that it seals crossheadings tightly, leaves no fissures, suppresses air leakage to the gob, and narrows the width of the spontaneous combustion and heat accumulation zone.