Periodic Reporting for period 1 - CodeDEMO (Construction and Demolition Waste-based “Green” Demountable Structural Components)
Okres sprawozdawczy: 2021-09-15 do 2023-09-14
In an effort to tackle the issues related to generation of massive amounts of CDW as well as traditional concrete, CodeDEMO project proposes a new paradigm of manufacturing construction materials and demountable structural components by using resources coming entirely from CDW, with the following main objectives: (i) the development of structural geopolymeric green concrete mixtures with both binder and aggregate phases based on CDW and (ii) the use of green structural concretes in the design and production of pre-fabricated demountable structural components for a more resource- and eco-efficient designs for building circularity.
In the second work package (WP2) of the project, the main emphasis was placed on the design and testing of structural components allowing easy demountability for future reuse. Physical tests of connections between different types of structural components as well as validation via numerical analyses have been performed. In order to develop structural elements in the forms of beam, column, wall, and slab and their connections, half- and real-scale specimens were manufactured and tested. Connections, which are the most vulnerable part of structural elements under the effect of seismic actions, have been of special focus to allow easy demountability and future reuse. During the development phase of connections of different structural elements, dry connections, which are generally obtained by using bolts in connection parts of structural elements instead of welding or wet concrete, were employed instead of wet connections. The proper detailing and design of these connections play a critical role in ensuring a sufficiently-ductile performance under seismic loading. Accordingly, structural performances of the beam-to-column, column-to-base, slab-to-beam, and shear wall-to-base connections were experimentally obtained and validated using finite element simulation against the experimental results. It has been shown that properly designed and manufactured connection details can lead to structural elements with performances similar to those having monolithic connections in seismic regions and this is irrespective of the use of CDW-based green concrete mixtures in the structural elements. The comparison of the experimental results with the numerical predictions indicated that the equations and assumptions in the numerical practices made for conventional reinforced concrete products provide conservative estimations for CDW-based geopolymer concrete products.