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Lignosulfonate for use in concrete with reduced clinker factor and in geopolymer concrete

The over all goal of the project is to develop new lignosulfonates for use in chemical admixtures for concrete and geopolymer concrete. Lignosulfonate is wiedly used as plasticizer (water reducing admixture) for concrete and it is the best performing plas tcizers for geopolymer concrete.The cement and concrete industry is moving towards less clinker and more fly ash (from coal fired power plants) and slag (from production of pig iron) in cement and concrete. Lignosulfonate is mainly interacting with the clinker component of the cement, making the concrete more workable and increasing the final strength of the hardened concrete. The limitation on dosage of lignosulfonate in concrete is given by the retardation of setting (transition from plastic to elasti c material) and the strength development. The goal of the project is to reduce or eliminate the retardation and improve the strength development.Geopolymer concrete is concrete made with slag or fly ash that is activated by alkali. A plasticizing admixt ure is needed to reduce the amount of mixing water and to make the geopolymer concrete workable. The performance of lignosulfonate is less than what the industry needs and there is room for improvement of the performance. This project will develop lignosu lfonates tailored for use in geopolymer concrete.Lignosulfonate is made from renewable raw material and provides CO2-saving of 14 kg per kg used in concrete. The motivation for reducing the amount of clinker in cement and concrete is to make concrete a more sustainable construction material. Geopolymer concrete has a much smaller carbon footprint than ordinary concrete. The use of lignosulfonate in concrete is sustainable and provides a cost-effective solution to the industry.The results of the projec t is expected to generate 65 000 MT of lignosulfonate sales from Borregaard within three years of concluding the project.

Prosjektleder:
Kåre Reknes
Institusjon:
 
Aktivitetsnavn:
Brukerstyrt innovasjonsarena
Prosjektstatus:
Bevilgning
Prosjektperiode:
01.01.2013 - 31.12.2015
Geografi:
Norge/ØSTFOLD/SARPSBORG
Fagområder:
Teknologi/Kjemisk teknologi/Kjemisk prosessteknologi
Prosjektnummer:
225358