ABSTRACT
In Brazil, the use of wood in construction is primarily temporary, and it can represent a great percentage of construction waste. It is typically discarded with minimal reuse or recycling. As landfill wood disposal could result in methane emissions and/or leaching of hazardous constituents polluting water or soil, the implementation of temporary wood waste reduction strategies must be a critical issue for local construction companies. To manage and control wood waste generation, including setting some reduction goals, it is necessary to identify the influencing factors and ways to quantitatively predict their relative contributions. This study uses a multiple regression statistical model to estimate the amount of temporary wood waste generated in the construction of high-rise buildings by considering the influencing factors related to the design/construction as well as site and safety installations. The case study includes 22 high-rise residential buildings. The regression model predicted approximately 89% of the factors involved in the generation of wood waste in similar constructions. The dependent variables that had an influence on the amount of wood waste are related to design features ('number of floors'), structural construction system ('in situ moulded concrete volume'), and site and safety installations ('site wood fence' and 'wood use rate'). Ways of minimising wood waste generation and the contributions of each type of temporary wood use were discussed.
ABSTRACT
Neste trabalho, estimou-se a gerão dos resíduos de construção e demolição por dois métodos de quantificação, um indireto e outro direto, considerando-se a produção advinda dos agentes informais e formais. O método indireto considerou a área construída das edificações (construção) e transformação dos pontos de ligação de água e luz instalados (reforma). O método direto identificou a geração advinda de agentes informais e formais nos pontos de disposição finais em diferentes regiões do município, empregando-se o conceito de balanço de massa. Não é possível quantificar a geração de resíduos de construção e demolição dos agentes informais (reformas) por meio de dados indiretos relacionados Às transformações dos pontos de água no município. Há indícios de que as transformações dos pontos de energia elétrica sejam um indicador indireto mais preciso, podendo evitar a dispendiosa quantificação direta.
In this paper, construction and demolition waste generation was estimated by two quantification methods, one direct and other indirect, regarding informal and formal generators. Construction area and transformation of the points of water and energy were applied for indirect quantification method. For the direct one, volume of dumping areas associated with informal and formal generators in different regions of municipality were quantified and the mass balance was applied. Indirect quantification of informal generators by transformation points of water is not precise. There are evidences that transformation points of energy can be more precise, avoiding costly direct construction and demolition waste quantification method.
