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نتیجه جستجو - Construction and demolition waste (CDW)

تعداد مقالات یافته شده: 2
ردیف عنوان نوع
1 Influence of construction company size on the determining factors for construction and demolition waste management
تأثیر اندازه شرکت ساخت در عوامل تعیین کننده ساخت و مدیریت زباله های تخریب-2021
Due to the relevance of construction and demolition waste (CDW) generation for circular economy and reduction of environmental impacts, it is important to evaluate the factors leading to constraints regarding waste. Previous researchers have assessed construction company attitudes and behaviors toward CDW management, but factors such as the presence of environmental technicians, registration of the CDW generated, commitment to the legal framework, the subcontracting regime, and construction works’ oversight were rarely addressed in terms of the differences existing within the construction sector. Thus, the objective of this research is to evaluate the rela- tionship of these factors with construction company size. A questionnaire was sent to Portuguese construction companies, and 652 responded. The sample was divided into three groups: micro, small, and medium/large companies. Statistical data treatment was carried out to assess whether there were statistically significant dif- ferences in the mentioned factors between groups. The main conclusions highlight: the prevalence of environ- mental technicians working in larger companies; the registration on waste platforms being only performed consistently by medium/large companies; a considerable proportion of micro and small companies having knowledge gaps about the practices adopted; the responsibility for CDW management within the subcontracting regime being mainly from subcontractors; and the presence of a gap regarding onsite construction works oversight. These differences lead to the need to reevaluate the strategies for CDW management and adapt the strategies to the specific conditions of the construction sector, including the size of construction companies.
keywords: بخش ساخت | شرکت های ساختمانی | ساخت و تخریب زباله (CDW) | مدیریت زباله | رفتار - اخلاق | Construction sector | Construction companies | Construction and demolition waste (CDW) | Waste management | Behavior
مقاله انگلیسی
2 Upgrading construction and demolition waste management from downcycling to recycling in the Netherlands
به روزرسانی مدیریت زباله های ساختمانی و تخریبی از موتور سیکلت به بازیافت در هلند-2020
Urban mining from construction and demolition waste (CDW) is highly relevant for the circular economy ambitions of the European Union (EU). Given the large volumes involved, end-of-life (EoL) concrete is identified as one of the priority streams for CDW recycling in most EU countries, but it is currently largely downcycled or even landfilled. The European projects C2CA and VEEP have proposed several cost- effective technologies to recover EoL concrete for new concrete manufacturing. To understand the po- tential effects of large-scale implementation of those recycling technologies on the circular construction, this study deployed static material flow analysis (MFA) for a set of EoL concrete management scenarios in the Netherlands constructed by considering the development factors in two, technological and temporal dimensions. On the technological dimension, three treatment systems for EoL concrete management, namely: business-as-usual treatment, C2CA technological system and VEEP technological system were investigated. On the temporal dimension, 2015 was selected as the reference year, representing the current situation, and 2025 as the future year for the prospective analysis. The results show that the development of cost-effective technologies has the potential to improve the share of recycling (asopposed to downcycling) in the Netherlands from around 5% in 2015 up to 22%e32% in 2025. From theacademic aspect, the presented work illustrates how the temporal dimension can be included in the static MFA study to explore the potential effects in the future.© 2020 Elsevier Ltd. All rights reserved.
Keywords: Construction and demolition waste (CDW) | Material flow analysis (MFA) | Waste concrete | Recycling | Downcycling | The Netherlands
مقاله انگلیسی
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