Utilization potentials of materials from deconstruction

Development of a method for the evaluation of building materials with regard to their technical, environmental and economic suitability for further use

In Europe, construction and demolition waste accounts for 35.9 ma.% of the total waste volume. In Germany, the recycling rate of construction waste was 88% in 2018, but about three quarters of the recycled aggregates are used in road construction or earthworks. For high-quality recycling of construction and demolition waste, the material properties, the type of demolition and the properties of the recyclate play an essential role.
Within the scope of the research project, a method is being developed that will be used to estimate and calculate characteristic values in order to enable investors and other constructors to assess the after-use potential of buildings already in the planning phase. The main objective of the project is to estimate future demolition costs and the residual value of demolition materials. Using real example data, treatment processes will be modeled and qualities of the residual materials derived from them, so that expected costs can be mapped in dynamic scenarios. The evaluation will take into account two dimensions of sustainability: Environment and Economy.
Based on the methods of life cycle costing (LCC) and life cycle assessment (LCA), the life cycle costs and environmental impacts of demolition and demolition materials are determined. For this purpose, different scenarios are developed that take into account different demolition methods as well as reprocessing processes and material qualities. For the development of the method, data on current and future demolition and demolition processes as well as reprocessing technologies will be collected and analyzed. Furthermore, the price development and the market value of the considered materials will be investigated. The method is intended to allow an early, yet holistic, assessment of the post-use potential of building components and materials. In addition, by coupling the LCC and LCA methods, trade-offs between costs and potential environmental impacts are identified, promoting the integration of sustainable circular economy approaches in the construction sector.
To analyze the economic aspects of the materials from deconstruction, in this project, INaB is carrying out a life cycle costing in parallel to the life cycle assessment of the project partners. Therefore, the real money flows (e.g. labor, material and energy costs) for deconstruction, transport and processing are taken into account and relevant data are compiled. The modeling is based on the Code of Practice of the Society of Environmental Toxicology and Chemistry (SETAC). By modeling different scenarios, cost drivers and trade-offs are identified, also in relation to environmental impacts.

Funded by:
Innovationsprogramm Zukunft Bau des Bundesministerium für Wohnen, Stadtentwicklung und Bauwesen (BMWSB)

Project partners:

M.Sc. Anna Luthin