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Alkali-aggregate reaction in nova scotia III. Laboratory studies of volume change

✍ Scribed by M.A.G. Duncan; E.G. Swenson; J.E. Gillott

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
645 KB
Volume
3
Category
Article
ISSN
0008-8846

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✦ Synopsis

Studies of alkali-expansivity of Nova Scotia rock types included extensive length change tests of mortar bars and concrete prisms, and also rock cylinders immersed in alkali solution.

The effects of such variables as alkali content, type of alkali, temperature, wet and dry cycling, anisotropy, optimum proportion of rock type, and the influence of pozzolan and fly ash were studied. Results obtained were correlated with petrographic studies so that potentially expansive rock types in the province may be recognized. Preventive measures applicable to field use were determined from analyses of expansion data.

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Certain siliceous and sedimentary rocks in Nova Scotia, when used as aggregate with high alkali cement, have produced excessive expansion of concrete. Laboratory studies showed a type of alkali-aggregate reaction to be responsible. Rock types in structures and in aggregate sources were identified by

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The authors have presented an interesting mechanism based on their laboratory studies on the expansion of phyllitic rocks due to alkali-aggregate reaction. In an investigation described below the writer found similar results. In proposing a mechanism of expansion, the authors suggested that it is si