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Construction and demolition waste as a resource for sustainable, very low-energy buildings

The framework of the research presented in the paper is a project oriented to promote the use of construction and demolition waste (CDW) as a new resource for constructing sustainable and very low-energy buildings. Intensive research activities have been carried out in application of recycled concrete and recycled brick as a replacement of natural aggregate in concrete. Based on conducted mechanical, durability and thermal testing of recycled aggregate concrete, replacement ratio of natural aggregate by 50% was determined as optimal. Research resulted with development of an energy and resource efficient construction product ECO-SANDWICH® - ventilated precast concrete sandwich wall panel with integrated formaldehyde-free mineral wool insulation. ECO-SANDWICH® wall panel is a benchmark construction product that allows very low energy design and retrofit of buildings ; therefore, it can be coupled with an exigent need to improve energy performance of the building stock in the EU and neighbouring countries. Storage of recycled materials from CDW in concrete and production of a new high quality construction product can add value to CDW and contribute to closing the loop of product lifecycles which is the basis of a circular economy. The last part of the paper presents the first application of ventilated precast concrete sandwich wall panels produced with recycled CDW and an overview of current research on its hygrothermal properties.

construction and demolition waste, recycled aggregate, energy efficiency, precast sandwich panel, ECO-SANDWICH®

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