Research on Mining Water-Rich Fly-Ash-Based Filling Material

Abstract:

It had decades of history that cementing material was used for filling in coal mine or metal mine goaf, which was a common filling material in recently filling mining. Paste and high water material have excellent performance, but the price was too high, which restricted the development of cemented filling technology severely. Later, fly ash and other industrial waste were mixed into the cementing material in order to reduce the cost, but because of which early activity was low, the early strength was reduced by mixing too much fly ash and other industrial waste, the setting time was extended, which affected the filling effect seriously. Therefore, it becomes a key problem that how to excite the early activity of fly ash. It was a breakthrough to select the appropriate activator and activation method, because of the difference mechanism of action and effects for different activators of fly ash, the complexity composition of filling material mixed with large number of fly ash, and the early and late physical and mechanical properties [1,2].Four salts are used for activators in this paper, which are mixed with fly ash and water, and a display method was selected to maximum activate the activity of fly ash, increase the early strength of the material, and reduce the cost of the material.

• Periodical: Advanced Materials Research (Volume 988)
• Pages: 201-206
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.988.201
• Online since: July 2014
• Authors: Wei Xin Chen*, Feng Yi Li, Xian Hua Guan, Lei Chen, Wen Bo Nie
• Keywords: Activator, Filling Material, Fly Ash (FA), Orthogonal Experiment

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DOI: 10.1142/s0950609802000963

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