A Territorial Construction System for a Circular Low-Carbon Built Environment (RECONSTRUCT)

在全球范围内，建筑行业负责超过30%的自然资源开采，25%的固体废物产生和40%的温室气体（GHG）排放。这些排放中约有三分之一来自建筑中的隐含碳。水泥和钢铁排放的温室气体最多，占总量的80%。由于水泥和钢铁的回收利用在进一步提高材料效率方面的潜力有限，因此重点是用低碳替代品替代它们，或者将它们嵌入可重复使用的建筑部件中。reconstruction将(i)开发普通波特兰水泥（OPC）的低碳替代品，用于翻新和新建建筑，并尽可能多地合并建筑和拆除废物（CDW）和其他废物，（ii）制造使用此类材料的建筑部件，并设计为模块化和拆卸，以便它们可以重复使用或易于拆卸和回收。（iii）在建筑设计中融入解构，建造在其整个生命周期中产生近零CDW的循环低碳建筑。通过(i)建筑材料、产品和建筑的数字化，（ii）广泛使用数字工具来支持循环建筑的设计、施工和解构阶段，以及（iii）通过创建涵盖循环建筑所有方面的利益相关者区域生态系统来实现建筑价值链的区域化，这些目标将成为可能。重建概念将通过在布鲁塞尔和巴塞罗那建立领土圆形集群来展示，并使用重建的材料、组件和创新工具来设计和建造两座真实规模的示范建筑。通过这样做，重建旨在展示其高影响潜力（包括每年减少1.3712亿吨二氧化碳的温室气体潜力，每年避免8500万吨CDW和每年替代1.97亿吨OPC混凝土）及其经济可行性。

Globally, the Construction industry is responsible for over 30% of the extraction of natural resources, 25% of solid waste generated and 40% of Greenhouse Gases (GHG) emissions. Around a third of these emissions come from embodied carbon in construction. Cement and Steel are responsible for most of the embodied GHGs, representing >80% of the total. With recycling of cement and steel having a limited potential for further improving material efficiency, the focus is on replacing them with low-carbon alternatives and/or embedding them in reusable construction components. RECONSTRUCT will (i) develop low-carbon alternatives to Ordinary Portland Cement (OPC), to be used in both renovations and new buildings, and incorporate Construction & Demolition Waste (CDW) and other waste as much as possible, (ii) manufacture construction components that use such materials and are designed for modularity and dismantling so they can either be reused or easily disassembled and recycled, (iii) embed deconstruction in building design and construct circular low carbon buildings that produce near-zero CDW across their lifecycle. These objectives will become possible through (i) the digitization of construction materials, products and buildings, (ii) the extensive use of digital tools to support the design, construction and deconstruction phases of the circular building and (iii) the regionalization of the construction value chain through the creation of regional ecosystems of stakeholders covering all the aspects of circular construction. The RECONSTRUCT concept will be demonstrated by setting up to Territorial Circular Clusters, in Brussels and Barcelona, and using RECONSTRUCT's materials, components and innovative tools to design and construct two real-scale demonstrator buildings. By doing so, RECONSTRUCT aims to demonstrate its high impact potential (including a GHG reduction potential of 137,12 Mt CO2 per year, avoidance of 85 million tonnes of CDW per year and substitution of 197 Mt of OPC concrete per year) and its economic feasibility.