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- W603374752 abstract "Some 40% of over 300 structures show evidence of alkali-aggregate reactivity. The reactions range from just detectable to serious destructive processes. The reactive aggregates are mostly highly polymictic sands and gravels but include crushed rocks. Reactive lithologies include chert, flint, siliceous ironstone, meta-argillite, greywacke to argillite, metaquartzite, siliceous volcanics, and calcitic dolomites. The expansive reactions mostly appear to take place within the aggregate and serious expansion and cracking is often related to the juxtaposition of two or more reactive particles. Cracks developed within the aggregate are thick in the central parts of the rock fragment and become thinner towards the aggregate surface. Gel occurs within the pores of the aggregate and issues from the rock fragments into cracks in the paste. These cracks are most damaging where a few reactive particles are close together and here the cracks tend to link the adjacent rock particles. In samples where aggregate particles have produced alkali-silicate gel it is sometimes found that very high levels of alkalies have been developed within other aggregate fragments without the particles themselves reacting. The reactions encountered do not appear to conform with the normal pessimum levels for particular lithologies and the uneven distribution of aggregate is thought to be of particular significance in producing damage. At a late stage in some reactions ettringite has been found to form in the gel and this appears to lead to further potential for deleterious expansion.(a) for the covering abstract of the conference see IRRD 811982." @default.
- W603374752 created "2016-06-24" @default.
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- W603374752 date "1987-01-01" @default.
- W603374752 modified "2023-09-27" @default.
- W603374752 title "A REVIEW OF SOME REACTIVE AGGREGATES FROM THE UNITED KINGDOM WITH REFERENCE TO THE MECHANISM OF REACTION AND DETERIORATION --PROCEEDINGS OF THE 7TH INTERNATIONAL CONFERENCE ON CONCRETE ALKALI-AGGREGATE REACTIONS, OTTAWA, CANADA, 1986" @default.
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