Comparing environmental burdens, economic costs and thermal resistance of different materials for exterior building walls
2018
Prateep Na Talang, Rutjaya | Sirivithayapakorn, Sanya
This research investigated the environmental impacts, the life cycle costs assessment (LCCA) and the thermal resistance (R-value) of autoclaved aerated concrete (AAC) and fired brick exterior walls in tropical climate zones. In the assessment, this study experimented with a total of six different wall construction schemes, three for AAC and three for fired brick, i.e., single-layer wall, double-layer wall with air gap, and double-layer wall with expanded polystyrene (EPS) foam insulation. The inventory data of both walls were gathered from actual data and literature reviews. The environmental impacts were quantified by the Stepwise2006 method, and the ecoinvent database was used. The LCCA was determined based on the Stepwise2006 weighting factors. Additionally, R-values were analysed resistance to heat flow of the wall materials. The findings revealed that the environmental impacts of all the AAC wall schemes were greater than those of the respective fired-brick wall schemes, and cement production was the dominant contributor to the environmental impact of all the schemes. For the respective wall schemes, the total costs (both project and environmental) of brick walls (44.39–79.58 US$2015) were lower than those of the AAC walls (48.95–95.66 US$2015). Moreover, the outcomes of the R-values of the AAC walls were higher than those of the brick walls, and the R-values of the double-layer walls of both materials were higher than those of the single-layer walls. Based on the Analytic Hierarchy Process (AHP), the single-layer fired brick wall was the most preferable choice.
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