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Translation abstract Re‐use of structural elements – quantifiying the ecological potentialThe re‐use of building elements is one of the key strategies for establishing a climate‐friendly and regenerative construction industry. However, building with used load‐bearing components in particular has so far been hampered by both regulatory hurdles and the linear planning process. The re‐use of steel girders from the stairwell tower of a parking garage in Stuttgart is an examplary project that demonstrates the great potential of reusing load‐bearing components. The associated emission savings could be quantified with the help of life cycle assessment. A consideration of the future reusability shows the limits of this method for a comprehensive consideration of the ecological added value. To make these uniformly measurable and thus promote the implementation of a circular economy in the construction industry, the life cycle assessment method must be supplemented by a circularity assessment. [ABSTRACT FROM AUTHOR]

Circulation‐effective potential of wood in hall structures The linear economy of unbridled consumption of resources is to be replaced by the controlled use of resources in the sense of the circular economy and that within the planetary and social boundaries. For the global climate pest, the construction industry, building in a circular economy will mean a significant reduction in gray emissions and resource consumption in the medium term. Essential requirements for all new buildings and conversions, for adding storeys and renovating existing buildings are waste avoidance, re‐use and flexibility of use. These cycle‐effective measures can be implemented through elementing, standardization and reversibility of the components. We have no problem of knowledge. We have a politically and economically motivated implementation problem. The consequent circular‐effective „Bauwende" through the change in politics and economy is needed. The implementation succeeds on the basis of a new tectonics of design and construction. The goal must be re‐use of elementary and standardized components without any loss of value. For this a reversible, form‐fitting and force‐fitting construction with the renewable carbon storage wood is particularly suitable and is illustrated in the present article using the example of a hall construction. Disruptive innovations and technologies through robotics, artificial intelligence and digital transformation serve as tools for implementation. [ABSTRACT FROM AUTHOR]

Model for the recyclability of building components Consistent recycling of available resources is one of the major challenges for construction in the future. This article contributes to the discussion and further development of recyclability in the construction industry. A model is presented that goes beyond the mere consideration of building materials and describes the overall recyclability of existing or new building structures. In this way, aspects of joining and separability of the individual building materials as well as erection and dismantling processes come to the fore. During the development of the model, care was taken to ensure that its structure is compatible with existing classifications and categories and is linked to existing frameworks and methods. In the medium term, the model provides a basis for a holistic development and discussion of closed‐loop recycling in the construction industry and is intended to make a long‐term contribution to the development of a verification procedure for mapping the sustainable use of natural resources. [ABSTRACT FROM AUTHOR]

REFUND: Investigation of existing foundations and decision making before re-use Before re-using existing foundations they have to be investigated for position, geometry and condition in the subsurface. The procedures and protocols haven't been standardized yet. Capabilities and limitations of appropriate testing methods are not known to all stakeholders. In the frame of the research project REFUND (2014-2016) we have developed decision trees for the planning and the investigation process, separately for single and strip foundations, slabs and piles. The protocols were tested in line with two actual projects. The results have been compiled in a handbook, which will support planners and other participants in a technical and economical optimized way to perform re-use of foundations. [ABSTRACT FROM AUTHOR]