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- W655917495 abstract "Three published reports specify a range of rock types that are unlikely to be reactive in the United Kingdom and list the components likely to be deleterious. In practice the crushed rock aggregates found to be reactive are greywacke and meta-greywacke and related rocks and argillites and meta-argillites. These occur in the North and West. Rarely crushed limestones are found to be reactive as a consequence of the presence of finely divided siliceous material. Sands and gravels containing these same rock types may also be reactive though the degree of reaction encountered tends to be low. A zone of reactive gravels extends from the Humber to the coast of South Devon and sands containing reactive cherts occur in the South West and in sea-dredged materials. Alkalies in concrete range from about 1.5 to 7 kg/m3. Reaction occurs at very low alkali levels but is not significant if the alkalies are less than about 2.5 kg/m3. Crack styles and distribution vary with the reactive aggregate and the size of the reactive particles. Reactive rocks are characterised by a very fine grain size - often not resolvable with the optical microscope - and a high microporosity. They sometimes have a special zoned or layered structure. Current optical tests for reactive strained quartz are considered to be of dubious value. (Author/TRRL)" @default.
- W655917495 created "2016-06-24" @default.
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- W655917495 date "1990-09-01" @default.
- W655917495 modified "2023-09-27" @default.
- W655917495 title "OBSERVATIONS ON ALKALI-AGGREGATE REACTIONS OCCURRING IN CONCRETE STRUCTURES IN THE UNITED KINGDOM . REPORT OF THE PROCEEDINGS OF THE SEMINAR ON ALKALI-AGGREGATE: THE EUROPEAN DIMENSION, UNIVERSITY OF LONDON SEPTEMBER 1990" @default.
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