engleski

Innovative prefabricated system with recycled CDW for new and renovation of existing buildings

This paper presents the development of a ventilated prefabricated concrete wall panel with integrated mineral wool insulation allowing very low energy design and retrofit of buildings. The optimisation of concrete mixtures containing 40, 50 and 60% of recycled concrete aggregates and recycled brick aggregates will be presented. Implementation of sustainable concrete products will enable environmental impact reduction of residential and commercial buildings. The purpose of the research is the encouragement of the re-use and recycling of construction and demolition waste (CDW) in order to shift CDW management from disposal to recycling and reduce utilisation of natural resources thus preventing landscape degradation. The substitution of conventional thermal insulation materials by mineral wool produced using innovative and sustainable technology is leading to reduced environmental impact through the reduction of embodied energy, embodied carbon and production of by-product wastes. The sustainability assessment of a building must represent a part of an integrated evaluation of the building performance. The envelope is one of the main parts of the buildings and external walls directly influence its thermal and environmental performance because of their considerable weight in the initial embodied energy, life-cycle energy consumption and whole-life cost. Additionally, the amounts of construction and demolition wastes generation soar each year and the supply of natural aggregates is contributing considerably to landscape degradation. In order to achieve the best ecology-to-quality ratio considering materials, during the presented research, concrete mix proportioning was optimized in order to maximise usage of recycled CDW without the reduction of mechanical and durability properties. The paper shows results of testing mechanical and durability properties of the concrete mixtures produced with different amounts and different types of the recycled aggregate, together with thermal properties and water vapour resistance respectively. Even though most studies recommend a limit of 30 % of recycled aggregate, while the research presented in this paper shows that both, recycled brick and recycled concrete, even in amount of 60 % of recycled aggregate, can be successfully used in the form of prefabricated wall panels for high-grade application in new and/or refurbished buildings.

Prefabricated concrete wall panel; recycled aggregates; embodied energy; nearly zero energy buildings; ventilated cross section

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