Field Application of Daily Covering Materials using Coal Ash

초록

In this study, coal ash buried in a landfill was recycled to manufacture an artificial daily covering material, and a field experiment was conducted to evaluate its usability. The coal ash used was fluidized-bed boiler coal ash and pulverized boiler coal ash. The artificial daily covering material produced was able to immobilize heavy metal ions. The unconfined compression strength was improved by the formation of C-S-H hydrate through the reaction of SiO<inf>2</inf> in soil with calcium hydroxide. The permeability coefficient of each type of coal based covering was similar to that of the standard. Re-slurring was not performed, and the odor emission standard was satisfied. the wind tunnel tes showed a weight reduction of 2.9% to 8.7% at a wind speed of 25 m/s depending on the type of covering. This study found that artificial daily covering materials made using fluidizedbed boiler coal ash are not harmful to the environment, so they can be used to replace traditional daily covering materials. © 2022, Korea Society of Waste Management. All rights reserved.

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