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The possibility of using finely ground waste glass as partial cement replacement in concrete was examined through three sets of tests: the lime-glass tests to assess the pozzolanic activity of ground glass, the compressive strength tests of concrete having 30% cement re-placed by ground glass to monitor the strength development, and the mortar bar tests to study the potential expansion. The results showed that ground glass having a particle size finer than 38 m did exhibit a pozzolanic behavior. A size effect was observed; a smaller glass particle size led to a higher reactivity with lime, a higher compressive strength in concrete, and a lower expansion. Compared to fly ash concrete, concrete containing ground glass exhibited a higher strength.

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