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Modeling the substitution of natural materials with industrial byproducts in green roofs using life cycle assessments
- Pushkar, Svetlana
- Journal of cleaner production 2019 v.227 pp. 652-661
- analysis of variance, bottom ash, coal, drainage, green roofs, industrial byproducts, life cycle assessment, models, perlite
- This study conducted life cycle assessments (LCAs) on four types of extensive green roofs and involved replacing natural perlite with the byproducts coal bottom ash (CBA) and fly ash-based aggregates (FAAs) in both the substrate and drainage layers of green roofs. The following combinations were investigated: perlite in both the substrate and drainage layers (PerliteSUB-PerliteDRIN), perlite in the substrate layer and FAAs in the drainage layer (PerliteSUB-FAADRIN), CBA in the substrate layer and perlite in the drainage layer (CBASUB-PerliteDRIN), and CBA in the substrate layer and FAAs in the drainage layer (CBASUB-FAADRIN). Two types of allocation approaches including mass allocation and system expansion were applied to the byproducts. The LCAs encompassed the production stage and the end-of-life stage. A two-stage analysis of variance (ANOVA) was used to analyze the ReCiPe results and the following was confirmed: (i) the analysis identified the best environmentally friendly roof alternative, (ii) it was observed that the results from the simplification of the LCA for the roof (omitting the end-of-life stage) depended on the type of evaluation approach used in the LCA, and (iii) the more comprehensive performance of the LCAs of green roofs was associated with a combination of the ReCiPe and ANOVA methodologies.