Study of Improving the Insulating Property of Brick Prepared by Waste Resources

초록

Heavy metal leaching from waste, such as waste limestone (WL), poses a significant secondary environmental problem. It is necessary to develop methods to detoxify these hazardous pollutants and effectively recycle them as resources. In this work, factors for enhancing insulating properties with the use of waste as resources have been studied. Waste, such as WL, melting slag (MS), and aluminum dross were used as raw materials to prepare insulating brick using the geopolymer technique. Sufficient amounts of Si and Al in raw materials were also required to prepare the insulating brick. Therefore, MS was used to supplement the proportion of Si and Al in order to form the geopolymer. The effects of the addition of aluminum dross and the molar ratio of alkali activator on the insulating properties were discussed. Additionally, the compressive strength and the apparent porosity of the prepared bricks were analyzed. The optimal properties of the brick material were obtained at a mixing ratio of WL to MS of 9.5: 0.5 and 3 wt. % Al dross. Under these conditions, thermal conductivity, compressive strength, and volume-specific gravity were 0.27 W/m∙K, 2.58 MPa, and 0.76, respectively. According to the regression analysis of the thermal conductivity and apparent porosity, a strong negative correlation between the two factors was obtained. © 2021, Korea Society of Waste Management. All rights reserved.

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