Abstract
The time-dependence of strength and deformation properties of an Acrylic polymer modified concrete has been investigated up to 600 days under wet and dry curing conditions. Ordinary Portland Cement mixes of proportion 1:2:3 (by weight) were used and the water cement ratio was adjusted in order to achieve reasonably constant workability for the control and modified mixes.
The results indicate that at the optimum polymer contents which lie in the range of 25–35% by weight of cement, maximum increases in the compressive and flexural strength, relative to the control mix, are of the order of 100 and 200% respectively.
The addition of polymer leads to a marked increase in the strain at the onset of cracking in the matrix and at ultimate stress. Maximum increases of up to 90% at first crack and 120% at ultimate stress have been recorded. Polymer addition also causes a significant increase in concrete cracking stress.
The validity of a standard expression defining the stress-strain relationship of plain concrete has been extended to polymer concrete.
Résumé
On a étudié durant 60 jours en ambiance sèche et en ambiance humide les propriétés de résistance et de déformation en fonction du temps d'un béton additionné d'une résine acrylique. On s'est servi de mélanges de ciment Portland ordinaire dans la proportion pondérale 1:2:3 et le rapport au ciment a été ajusté afin d'obtenir une ouvrabilité constante convenable pour le contrôle et les additions aux mélanges.
Les résultats indiquent qu'aux teneurs optimales en résine qui se situent dans l'intervalle de 25–35% en poids de ciment, les accroissements maximaux des résistances en compression et en flexion du mélange contrôlé sont respectivement de l'ordre de 100 et 200%.
L'addition de polymères induit une augmentation notable de la déformation en début de fissuration de la matrice et sous contrainte ultime. On a enregistré un accroissement maximal allant jusqu'à 90% à la première fissure, et à 120% à contrainte ultime. L'addition de résine provoque aussi une augmentation notable de la contrainte de fissuration dans le béton.
On a adapté au béton additionné de résine une expression usuelle qui définit la relation contrainte/déformation du béton ordinaire non armé.
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Mangat, P.S. Strength and deformation characteristics of an acrylic polymer-cement composite. Mat. Constr. 11, 435–443 (1978). https://doi.org/10.1007/BF02475117
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DOI: https://doi.org/10.1007/BF02475117