Ferrández Daniel, Saiz Pablo, Zaragoza-Benzal Alicia, Zúñiga-Vicente Jose Angel
Departamento de Economía de la Empresa (ADO), Economía Aplicada II y Fundamentos Análisis Económico, Universidad Rey Juan Carlos, Paseo de los Artilleros, s/n, 28032, Madrid, Spain.
Departamento de Economía Financiera, Contabilidad e Idioma Moderno. Universidad Rey Juan Carlos, Paseo de los Artilleros, s/n, 28032, Madrid, Spain.
Heliyon. 2023 May 27;9(6):e16641. doi: 10.1016/j.heliyon.2023.e16641. eCollection 2023 Jun.
The reuse and recycling of construction and demolition waste is becoming an advisable choice to reduce the consumption of key raw materials and the environmental impact generated by the construction of new buildings. This study proposes the introduction of two new stages of recycled aggregate processing that allow redesigning the production process of recycled aggregates towards a more sustainable and eco-friendly system: sieving with secondary crushing and washing. Based on an experimental study, our findings show that the new stages reduce significantly the content of impurities and the water absorption of recycled aggregates, obtaining a better final product (i.e. cement mortar) for buildings. Moreover, the new final product made with treated recycled aggregates also experiences significant improvements in their physical and mechanical properties (i.e.: increased on average, 5% in flexural strength, 6% in compression strength and reduced shrinkage by 2%), in turn reducing both the costs associated with the manufacture of the new product and its environmental impact compared to other products that solely include untreated recycled aggregates. The potential economic and solid waste management implications for firms that choose to deploy the new production system depicted are also discussed.
建筑与拆除废物的再利用和回收正成为一种明智的选择，以减少关键原材料的消耗以及新建建筑施工所产生的环境影响。本研究提出引入两个新的再生骨料加工阶段，这使得再生骨料的生产过程能够朝着更可持续和环保的系统进行重新设计：二次破碎筛分和水洗。基于一项实验研究，我们的结果表明，新的阶段显著降低了再生骨料的杂质含量和吸水率，从而为建筑获得了更好的最终产品（即水泥砂浆）。此外，用经过处理的再生骨料制成的新最终产品在其物理和力学性能方面也有显著改善（即：抗弯强度平均提高5%，抗压强度提高6%，收缩率降低2%），与仅包含未处理再生骨料的其他产品相比，这反过来又降低了与新产品制造相关的成本及其环境影响。文中还讨论了选择采用所描述的新生产系统的企业在经济和固体废物管理方面的潜在影响。
