Abstract
The effect of polymer addition on the rate and the extent of alkali silica reactions in mortars containing high alkali conceptrations has been investigated. A bicomponent epoxy resin was added to the mortars formulation up to a 20 wt% of cement content. Mortars of the same composition, but formulated without reactive aggregates, were also cast and subjected to the same curring procedure. Their microstructure, mechanical properties, dimensional stability and calcium hydroxide content were thus investigated. As the polymer content increases, mortar expansion is reduced: hypotheses for this behaviour, based on the microstructural characteristics of the composites, are proposed.
Résumé
On a évalué l'effet de l'ajout des polymères sur la vitesse et l'étendue des réactions alcali-silice dans les mortier contenant une concentration élevée d'alcalis. Une résine à deux composants a été ajoutée à la formulation des mortiers jusqu'à 20% en poids sur le ciment. Les mortiers ont été soumis à une maturation accélérée à 80°C; on a aussi confectionné des mortiers de la même composition, mais sans granulats réactifs. On a ensuite étudié la microstructure, les propriétés mécaniques et les modifications dimensionnelles. Jusqu'ici, les résultats montrent que la hausse de la quantité de polymères augmente la stabilité dimensionnelle des mortiers. On propose une hypothèse pour ce comportement, laquelle est fondée sur les caractéristiques microstructurelles des échantillons.
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Saccani, A., Motori, A. The effect of polymer addition on alkali silica reactions in cementitious mortars. Mat. Struct. 34, 373–377 (2001). https://doi.org/10.1007/BF02486489
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DOI: https://doi.org/10.1007/BF02486489