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                <term xml:lang="en">durability</term>
                <term xml:lang="en">mechanical properties</term>
                <term xml:lang="en">recycled concrete</term>
                <term xml:lang="en">Environment</term>
                <term xml:lang="fr">Béton recyclé</term>
                <term xml:lang="fr">Propriétés mécaniques</term>
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              <p>de Génie Civil, nourredine.arabi@univ-annaba.dz. RÉSUMÉ. L'objectif de ce travail expérimental est l'étude de l'influence de la nature des granulats recyclés (fins et grossiers) sur les propriétés des bétons ordinaires sans adjuvants, en substituant les granulats naturels par les granulats recyclés avec différents pourcentages volumiques de : 0, 15, 30, 50 et 100 %. Les propriétés du béton ont été étudiées à partir de dix compositions dans la classe de résistance C35/45 avec une même ouvrabilité plastique S2 et de classe d'environnement EA2. Seulement, les graviers recyclés ont subi une pré-saturation pendant 24 h, Ils sont incorporés à l'état saturé à surface sèche. Les résultats obtenus montrent que les résistances caractéristiques des différents bétons ordinaires recyclés sont généralement satisfaisantes. La substitution des granulats naturels par les recyclés à un pourcentage de 30%, limite trouvée dans la littérature, n'a pas influencée les propriétés de ces béton que ce soient mécaniques ou de durabilité ; Particulièrement avec celui du gravier recyclé dont son taux de substitution peut atteindre les 50%. ABSTRACT. The aim of this experimental work is to study the influence of the nature of the recycled aggregates (coarse and fine) on the properties of ordinary concrete without additives, substituting natural aggregates by recycled aggregates with different volume percentages of: 0, 15, 30, 50 and 100%. Concrete properties were studied from 10 compositions in the strength class C35/45 with the same plastic workability and S2 of EA2 environment class. Only, gravel recycled underwent pre-saturation for 24 h, they are incorporated into the saturated surface dry condition. The results obtained show that the characteristic strengths of the various recycled concretes are generally satisfactory. The substitution of natural aggregates by recycled at a percentage of 30%, limits found in literature, has not influenced the properties of the concrete that are mechanical or durability; Especially with recycled gravel which its substitution rate can reach 50%. MOTS-CLÉS : Environnement, béton recyclé, propriétés mécaniques, durabilité.</p>
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