Jämförelse mellan betong och klimatförbättrad betong : Livscykelanalys inkluderande byggskede A1-5 och driftsenergi B6 i flerbostadshus
Sammanfattning: Concrete is a leading building material due to its durability, strength and carrying capacity etcetera. A weakness of concrete is it´s relatively large carbon dioxide emissions that are released during the production process. At this current time cement production accounts to 5% of the world's GHG emissions. Boverket has set a specific requirement that new buildings must be climate declared as a guide to more sustainable construction. This study aims to investigate and use a model-based LCA-assessments where climate- improved concrete is compared to a traditional concrete. This was done by examining a BIM- model. The possibility of improving the environmental impact is answered by producing carbon dioxide emissions equivalent for concrete in this property and comparing it with carbon dioxide emissions equivalent for a climate-improved concrete to show a potential carbon dioxide saving. A quantitative method is selected for this study using LCA. LCA-assessment is performed using several computer-based BIM programs to be able to produce simulations and calculations. A reference building that represents an ordinary apartment building in Sweden forms the basis of the assessment. LCA is based on only one environmental indicator which is carbon dioxide emissions. LCA assessment for the two types of concrete include the construction phase A1-A5 as well as the phase B6 operating energy according to Swedish standard SS-EN 15978: 2011. No account is taken of any differences in strength, fire class and sound class when exchanging materials. LCC limits to utility calculation. Results shows the total price increases by approximately SEK 49,000 if the ordinary concrete is replaced with a climate-improved concrete, and the carbon dioxide emissions is reduced by approximately 57,000 kgCO2e. Reduction in the climate-impact of concrete partly helps in the climate policy framework 2045 for a climate-neutral Sweden. Climate-improved concrete has limits within exposure and strength classes. Surroundingenvironment must therefore be considered.
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