A. Cas-de-l-'échantillon-gris and N. , 40 mm) et partiellement saturé Résultats de perméabilité apparente. La Fig. 4.30 permet de visualiser la variation de perméabilité apparente K app en fonction de la température lors du seul cycle de chauffage jusqu'à 200 o C de cet échantillon. A partir de 150 o C (température du béton) et jusqu'à 180 o C, le capteur de pression situé en amont de l'échantillon montre que le gaz ne peut plus passer par le réseau poreux. Comme pour l'échantillon Gris N o -4L, la pression d'injection de gaz ne diminue plus, elle augmente même petit à petit

. Après, échantillon est replacé en étuve à 105 o C, pour vérifier s'il contient encore de l'eau libre Après 12 jours en étuve à 105 o C, l'échantillon a perdu seulement 0,1g : on peut dire qu'il n'y avait plus réellement d'eau libre dans l'échantillon après chauffage jusqu

. Résultats-de-perméabilité-intrinsèque-et-de-coefficient-de-klinkenberg, effet Klinkenberg, car la valeur de ? calculée est négative, voir la Fig. 4.31. L'interprétation est la même que pour les essais précédents. On trouve une perméabilité apparente très faible, de l'ordre de 10 ?19 m 2 . Par contre, à 200 o C, la perméabilité intrinsèque K int vaut 3,98×10 ?18 m 2 : cet échantillon, après avoir été chauffé à 200 o C, est beaucoup plus perméable qu'à l'état initial. Le coefficient de Klinkenberg ? est égal à 0,653MPa. Mais en l'absence d'effet Klinkenberg à température ambiante

. Klinkenberg-reste-négatif, et que la perméabilité augmente légèrement avec la pression d'injection . Par contre, en fin de cycle, lorsque l'on revient à la température ambiante, la perméabilité intrinsèque est beaucoup plus élevée par rapport à la valeur initiale : K int vaut 2, pp.55-65

. Sur-ce-béton-gris, effet de structure sur l'existence de l'effet bouchon : il existe même sur un échantillon beaucoup plus court (40mm de long et toujours 65mm de diamètre) Il dure également longtemps (plusieurs heures)

. Bap and . Bath, on n'observe un effet bouchon que pour l'échantillon long (80mm) lorsqu'on chauffe assez vite (3,74 o C/min), mais il existe de façon nette (de 52 o C à 192 o C -température du béton) Hormis la plus grande porosité de ce matériau par rapport au béton gris, une explication de l'absence d'effet bouchon sur l'échantillon court peut être liée à la présence de gros pores inattendus sur la carotte, ? Pour le béton avec granulats concassés calcaires qui permettent a priori aux fluides

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