Blar i Institutt for konstruksjonsteknikk på forfatter "Wigum, Børge Johannes"
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Alkali Aggregate Reactions (AAR) in concrete. The Norwegian endeavour during more than 3 decades of research
Wigum, Børge Johannes; Lindgård, Jan; De Weerdt, Klaartje; Pedersen, Bård Magne; Rønning, Terje F. (Chapter, 2022)It is now more than 80 years since Alkali Aggregate Reactions (AAR) first were reported as a deleterious deterioration mechanism in concrete. In Norway, AAR was recognised in the late nineteeneighties. Norwegian experience ... -
Determining alkali content in ASR performance-tested concrete
Kermit, Peter Holiman (Master thesis, 2017)Alkali silica reation (ASR) is a common deterioration mechanism of concrete. During ASR, reactive aggregate containing silicon oxide (SiO2) can react with the alkaline fluid in the concrete pores. To test whether a concrete ... -
Pyrrhotite in concrete aggregate. Introduction to mechanism, damage potential and ongoing research
Lindstad, Hallvard; Lindgård, Jan; Pedersen, Bård Magne; Wigum, Børge Johannes; Aasly, Kurt; Ullnæss, Inger Lise; Oberhardt, Nikolas; De Weerdt, Klaartje (Chapter, 2022)Pyrrhotite is an iron sulfide which when present in concrete aggregate may lead to expansive reactions, cracks and finally disintegration of the concrete. This potential risk when using aggregates containing sulfides in ...