Klimatförbättrad betong : Hänsynstaganden vid projektering och utförande

Sammanfattning

This thesis investigates climate-improved concrete from technical and environmental perspectives, focusing on how alternative binders affect material properties and practical application. The aim is to increase understanding of performance, climate impact, and feasibility within the construction sector.The study combines a literature review, qualitative interviews with 13 industry professionals, and quantitative climate impact calculations. These calculations cover various cement types, exposure classes, and water-cement ratios, using both conventional and recycled reinforcement.Results show that concrete made with lower clinker cement types, such as CEM II/B, combined with recycled reinforcement, can reduce climate impact by up to 50%, with the lowest measured value being 40.1 kg CO₂/m³. However, this comes with technical challenges, including slower strength development, greater early frost sensitivity, and increased risk of plastic shrinkage cracking, particularly without proper curing. Advantages include lower heat development and, in some cases, improved chemical resistance.Stakeholder attitudes vary, with skepticism often stemming from knowledge gaps rather than proven limitations. The study highlights the need for enhanced competence, clearer guidelines, and continued innovation. The upcoming SS-EN 1992-1-1:2023 standard is expected to support implementation through updated structural requirements.In conclusion, climate-improved concrete is a viable and sustainable alternative when applied with expertise, requiring industry collaboration and further development to realize its full potential.