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- W112080462 abstract "AAR of the type Slow/Late-Expansive Alkali-Silicate/Silica reaction has recently been diagnosed in numerous Norwegian dams, hydropower plants and road bridges. AAR has been caused by a generally high alkali content in Norwegian cements during decades and rock aggregates (coarse fractions) of rhyolite, sandstone, graywacke, argillite, quartzite, phyllite and cataclastic rocks (mylonite and cataclasite). Field inspections of 483 structures older than 10 years have revealed map cracking and volume expansions as significant for AAR in Norwegian structures. Furthermore map cracking has been observed in about 70% of investigated structures with an increased cracking tendency in structures built around 1950-1960. Significant for AAR in concretes are: Reaction rims in broken faces of reacted aggregates, dark peripheral zonation in aggregates (clarified rim), white reaction products precipitated in larger air voids and cracked aggregates and cement paste. Reaction products (gel and cryptocrystalline) occur in cracks in aggregate and cement paste and in air voids. To minimize the risk for AAR in future structures, the Norwegian Concrete Society has recently proposed a test procedure for aggregates used in concrete. (A) For the covering abstract see IRRD 871351." @default.
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- W112080462 date "1992-01-01" @default.
- W112080462 modified "2023-09-27" @default.
- W112080462 title "ALKALI-AGGREGATE REACTION IN SOUTHERN NORWAY" @default.
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