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The Effect of Alkali-aggregate Reactivity on the Mechanical Properties of High and Normal Strength Concrete by H Marzouk; S Langdon is a Engineering article available to read on EtoBox.

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In this investigation, a potentially highly reactive aggregate, and a potentially moderately reactive aggregate (identified by accelerated mortar bar testing and petrographic examination) were used in the preparation of concrete of normal and high strength concretes. After the initial 28 day curing period, the specimens were equally divided, and then submerged in a holding tank containing either a solution of a sodium hydroxide or de-ionised water at 80 °C for a period of 12 weeks. Normal strength concrete specimens containing the potentially highly reactive aggregate and exposed to the sodium hydroxide solution experienced more losses in mechanical properties than the concrete specimens prepared with potentially moderately reactive aggregates. However, in high strength concrete specimens exposed to the sodium hydroxide solution, there was a minimal loss in mechanical properties for both the specimens containing the highly reactive or moderately reactive aggregates. The superior performance of high strength concrete can be explained by the improved micro-structure and decreased permeability due to the formation of secondary calcium silicate hydrate formed as a result of the pozzola

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Author

H Marzouk; S Langdon

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0958-9465)

Published

2003

Language

EN

Field

Engineering (Physical Sciences)