Dimensionering av pelare och balkar i ett bostadshus med UHPC, respektive NC : En jämförelsestudie ur aspekten, en hållbar design

Sammanfattning: It is a well-known problem that concrete needs to be made more efficient and that it is the large consumption of cement that is the major contributing factor to the nearby need. There is a zero vision of a climate-neutral concrete where all CO2 emissions in the life cycle of the concrete are to be reset by 2050. It is a question of improving, above all, the process of handling CO2 in the production of cement. This study tackles CO2 emissions from the concrete from a holistic perspective, by exploring optimization possibilities when implementing a newly developed concrete in residential buildings, called Ultra High Performance Concrete (UHPC). While it should be a better alternative for the climate, it should also require less material consumption and be more cost-effective in order to create a competitive alternative to the conventional alternative today, called Normal Concrete (NC). UHPC is during a development phase regarding optimization opportunities and it has been proven in several studies to be able to relate better to a sustainable design, based on a total life cycle progression. This applies above all to large and robust bridge structures where large volume differences are available. The idea behind this study is to highlight the question of whether there is an opportunity to get similar results in the construction of less robust components in residential buildings, since the problem with the mix design for UHPC has been the overall high cost in relation to NC. In recent years, this cost has been reduced and now there are opportunities to effectively introduce UHPC into another segment.In this study, columns and beams were dimensioned in a residential NC building and a residential UHPC building with ETABS (CSI 2019). Furthermore, the components of the buildings were compared, based on the aspect of a sustainable design from a total LCA. What was investigated were the differences in total material consumption, CO2 emissions, and costs.The study showed that the UHPC components were better based on all aspects after its total LCA. The total cement consumption was larger, but the building received at the same time an estimated double the lifespan of the NC- building. The total material consumption in the form of total component volumes became smaller, the total annual CO2 emissions became smaller and the total annual costs became smaller as well.