Experimental Study on Mine-Loess and Fly Ash Backfilling Material

Abstract:

In order to reduce the cost of backfilling materials in north-west mining area, the feasibility of making the loess as backfilling material in coal mine was discussed in this paper, an orthogonal experiment were conducted and the ratio of backfilling material is gained by author. The experiment was based on the material as main material: loess with fly ash, auxiliary material:cement with lime and other additive agent. According to the mechanism of alkali excitation on the potential activity of the fly ash , a four levels and five factors experiment was conducted by using the orthogonal principle, to analyze the influence of various factors on the main indicators of material specimen, the new material ratio that meet the requirements of backfilling is obtained. Experimental results indicate that: it's feasible to make the loess with fly ash as filling material in coal mine, the appropriate slurry concentration is 60% ~ 65% and the optimal range of the weight ratio of loess with fly ash is 1:1.5~1:3, the optimal range of the weight ratio of auxiliary materials with solid material is 30%~33% and 5%～7% of additive dosage respectively, the appropriate curing time is 28 days.

• Periodical: Advanced Materials Research (Volumes 1010-1012)
• Pages: 1518-1522
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1010-1012.1518
• Online since: August 2014
• Authors: Kai Hua Sun
• Keywords: Fly Ash (FA), Loess, Mine Backfilling Material, Orthogonal Experiment

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