Koldioxidreducerad betong : Med betongens egenskaper bibehållna

Sammanfattning: This study will explore if, and if so how, a transition into a more sustainable and eco-friendly ordinary portland cement can be made, without damaging its fundamental strengths and properties. The core concept essence of this degree project focuses on a comparison between four central properties of fly ash in portland cement with those of ordinary portland cement: the chloride-induced penetration, alkali reactivity, frost resistance and strength. The study will attempt to describe what measures the concrete industry are taking on the path towards a non-fossil future, following a sort of a roadmap. The process of making concrete is a major contributor to CO2 emissions, and the process is energy-intensive. The changing climate is affecting every living thing on this planet in a negative way, and in the end, there will be devastating consequences for all the different sectors of society if we cannot change our ways of using natural resources. Because of its current carbon footprint, the construction industry has a long way to go before reaching its non-fossil vision. A literature study was carried out to determine if concrete’s current properties and solidity could be retained when making a non-fossil concrete, or at least a more eco-friendly one. The alternative admixture fly ash decreased the amount of water needed and reduced the amount of clinker particles used in making concrete. This leads to a decreased usage of fossil fuel in the production process, without actually affecting the actual life span of the concrete negatively. In fact, use of fly ash improves the concrete a longer life span. Another vital measurement that can be taken is to use the technique called CCS, which leads to a decreased amount of pollution in the production process. The Swedish construction industry is determined to reach their non fossil vision. There is a strong belief that a life without being dependent on fossil fuel is a better life, and this will hopefully lead to a global race towards achieving sustainability. The result of this study shows that the current development within the industry is eco-positive and will contribute towards a more sustainable future for the concrete industry.