Beton leger de pouzzolane naturelle a tres haute performance
Eddie Franck Rajaonarison
Beton leger de pouzzolane naturelle a tres haute performance
Eddie Franck Rajaonarison
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Nous etudions les differentes caracteristiques du beton leger de pouzzolanes: mecanique, thermomecaniques et acoustique afin d'evaluer les performances du beton. Une resistance a la compression de 19 MPa correspond a une densite Inferieure ou egale a 1800 kg/m3 du beton et, a partir de 10 a 18 MPa pour les densites comprises entre 1300 et 1700 kg/m3. Les valeurs de la conductivite du beton sans sable sont basses, inferieures a 0, 403w/mk. Lorsque la teneur en sable du beton augmente, la conductivite evolue de 0,565 a 0,657 w/mk. Selon le dosage de beton et les types de frequence, les coefficients d'absorption sont compris entre 0,14 et 0,47. Les tests gel-degel ont ete realises jusqu'a ce que les echantillons se sont deteriores, ou atteignaient 400 cycles. Les nombreux resultats experimentaux obtenus montrent un melange optimal des agregats de pouzzolane naturelle pour fabriquer des betons legers a haute performance.
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