Transportation of building materials, an environmental issue?

peer reviewed11. Sustainable cities and communitie

Matériaux de construction et Recyclage, définitions et mise en contexte

Cette intervention vise à mettre en évidence les enjeux liés au recyclage des matériaux de construction et les complémentarités qui existent entre le réemploi et le recyclage et ce, en repartant des définitions données par la Directive Cadre sur les déchets (2008/98/CE). Cette présentation permet aussi de préciser certaines notions importantes autour du réemploi et du recyclage et d'identifier des pratiques professionnelles à initier et/ou à renforcer pour garantir la valorisation des matériaux de construction, une fois arrivés en fin d'un premier cycle d'utilisation et ainsi éviter la production de déchets.11. Sustainable cities and communities12. Responsible consumption and productio

Apprendre par l’expérience

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Choix équilibré d'un isolant thermique, comment répondre aux exigences de performances énergétiques tout en limitant l'impact environnemental global et en favorisant la circularité des matières?

peer reviewedAu vu des enjeux relatifs à la rénovation énergétique du parc bâti et à la gestion des ressources, il devient urgent d’élargir le processus de sélection des matériaux isolants à des critères environnementaux et circulaires, en dépassant les préoccupations énergétiques et financières actuelles. Cette approche est mise en avant dans un état des lieux réalisé par les deux autrices sur une cinquantaine de matériaux. Elle se veut multicritère et complémentaire à l’approche quantitative de l’analyse de cycle de vie. Le présent article discute certaines notions de cet état des lieux dans l’objectif d’aider tout concepteur à faire un choix d’isolant qui soit équilibré entre ces différents aspects et adapté à son projet de rénovation13. Climate action11. Sustainable cities and communitie

Quel avenir pour les logements d’avant-guerre à valeur patrimoniale en Wallonie ?

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Evaluation of the properties of a new circular building composite material to upcycle building wastes

peer reviewedA new circular composite material for building applications is developed, made of two secondary raw materials coming from waste recycling: fibers and sand. Hydraulic lime is added as a binder. This new composite targets a low environmental impact thanks to benefits of upcycling buildings waste, low energy production process, lifetime up to 60 years and of a high potential of reversibility, reuse and upcycling. The research focused on mechanical and physical properties, as well as analysis of the microstructure by X-ray 3D microtomography and in-situ compression testing. The mechanical and physical test results show good and unexpected properties: a density of 390 to 1300 kg/m³; a compressive strength between 0.2 and 2.2 MPa, a bending strength of 0.1 to 1.9 MPa and a thermal conductivity of 0.06 to 0.14 W/mK. Further research will focus on circular construction and environmental aspects. Three applications are envisioned, according the standards of the building sector9. Industry, innovation and infrastructure11. Sustainable cities and communities12. Responsible consumption and production13. Climate actio

A method for the retrofitting of pre-1914 Walloon dwellings with heritage value

The sustainable energy renovation of historical buildings and listed heritage is a challenge for Belgium and other European countries. These are crucial for urban and rural development and for the future of old buildings. This is the context of the ‘P-RENEWAL’ research project. It aims to develop a methodological tool for retrofitting historical Walloon dwellings built before 1914, to enhance their heritage values while implementing relevant energy measures. The originality of this research is to consider energy, environmental and heritage aspects in a complementary way, in order to help designers achieving a goal of greater sustainability. According to the listed heritage administration, dwelling types built before 1914 represent approximately 25 % of the Walloon stock. This project is related to the research work carried out under the Task 59 of SHC ‘Renovating Historic Buildings Towards Zero Energy’. The methodology used to achieve the research objectives is articulated in various steps. First, a typological analysis of buildings from the interest era is completed. Then, based on on-site studies performed on representative case studies, the evaluations of heritage values and performance are conducted. Finally, dynamic energy models are run to support the proposition and validation of retrofitting strategies

Combining multi-view photogrammetry and wireless sensor networks when modelling the hygrothermal behaviour of heritage buildings

The construction sector has now entered the 'Digital era', and professionals are slowly getting familiar with many of these innovative technologies. This paper shows how such innovations improve the investigation phase when it comes to energy retrofits on heritage buildings. More specifically, multi-view photogrammetry and wireless sensor networks can facilitate the implementation and enhance the relevance of building hygrothermal and energy simulations: photogrammetry quickens up the reproduction of the building geometry whereas wireless sensor networks facilitate and enlarge the collection of data relative to the existing behaviour of an occupied building. This paper explores the benefits of using those two technologies compared to more traditional solutions, regarding data quality and general workflow. In this purpose, two case studies from research projects ongoing in Belgium are briefly described

SUSTAINABLE RETROFITTING OF DWELLINGS IN BRUSSELS CAPITAL REGION: FIVE SCENARIOS OF EVOLUTION USING A MULTI-SCALE AND -CRITERIA PRE-ASSESSMENT TOOL

peer reviewedIn the next decades, most of the energy consumption of the building sector in Europe will be due to the buildings that exist today. The present paper presents the first results obtained by a web-based tool developed to enable a clear visualisation of existing dwelling stock in Brussels Capital Region and to help major stakeholders and public institutions of the region to define their strategies to retrofit the dwellings built before 1945. The tool is structured with six different scales and the characterisation of building stock is based on a set of criteria focused on three main topics: energy, environment and heritage value. Existing dwellings are grouped in seven different types and each type can be retrofitted in a specific manner (envelope, systems and number of dwellings per building). This paper presents and compares five scenarios of evolution of the dwelling stock. This tool can only be used to analyse Brussels Capital Region for the moment, but the methodology can be applied to other regions in the world. Enlarging the scope of this tool will help to meet the environmental, social and economic challenges of the contemporary world and to foster the transition of building sector towards a sustainable development