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Expanded vitrified small hollow ball (EVSB), made from a special type of perlite mineral is one of the recently developed materials in China. It is widely used as a cementitious thermal insulating mortar for building envelope construction in hot-humid areas of southern China. However, EVSB is a porous material sensitive to environmental moisture. The thermal insulating property of the EVSB mortar is dependent on its moisture transport and storage characteristics. In this study, hygroscopic sorption properties of EVSB mortars have been investigated, in comparison with those of normal expanded perlite particle (NEPP) mortars. The BET specific surface area and the BJH pore size distribution, as well as the SEM micro-morphologies of the mortars were assessed. It was observed that EVSB mortars had lower moisture sorption capacity than NEPP mortars when the relative humidity (RH) was higher than 70% because of its lower total pore volume. The addition of water-repellent admixtures in the mortar decreased the moisture sorption capacity of EVSB mortars but still maintains the same physisorption isothermal characteristics. It is also evident that the thermal conductivity values of both NEPP and EVSB mortars increased rapidly when RH is above 90%. However, the increase rate of thermal conductivity of NEPP mortars was apparently higher than that of EVSB mortars. It is hoped that finding from this study will help to develop a better understanding of the in-situ thermal performance of EVSB mortar used for the building envelope construction in hot and humid areas of southern China.La bille creuse vitrifi\ue9e expans\ue9e (BCVE), fabriqu\ue9e \ue0 partir d?un type sp\ue9cial de perlite, est l?un des mat\ue9riaux les plus r\ue9cemment mis au point en Chine. Il est largement utilis\ue9 dans les mortiers d?isolation thermique cimentaire pour la construction d?enveloppes de b\ue2timent dans les r\ue9gions chaudes et humides du sud de ce pays. Toutefois, la BCVE est un mat\ue9riau poreux qui est sensible \ue0 l?humidit\ue9 ambiante naturelle. La propri\ue9t\ue9 d?isolation thermique du mortier \ue0 BCVE est tributaire de ses caract\ue9ristiques de transport de l?humidit\ue9 et d?entreposage. Dans le cadre de cette \ue9tude, les propri\ue9t\ue9s de sorption hygroscopique des mortiers \ue0 BCVE ont \ue9t\ue9 examin\ue9es, en regard de celles des mortiers de particules de perlite \ue0 expansion normale (PPEN). Nous avons \ue9valu\ue9 la surface sp\ue9cifique BET et la distribution de taille des pores BJH, de m\ueame que les micromorphologies, analys\ue9es par microscopie \ue9lectronique \ue0 balayage des mortiers. Nous avons observ\ue9 que les mortiers \ue0 BCVE pr\ue9sentaient un pouvoir de sorption de l?humidit\ue9 plus faible que les mortiers de PPEN \ue0 des taux d?humidit\ue9 relative (HR) sup\ue9rieurs \ue0 70 %, en raison de leur moindre volume poreux. L?utilisation d?adjuvants hydrofuges dans le mortier s?est traduite par une diminution de la capacit\ue9 de sorption de l?humidit\ue9 des mortiers \ue0 BCVE, tout en conservant les m\ueames caract\ue9ristiques isothermes de physisorption. Il apparait \ue9galement de fa\ue7on non \ue9quivoque que les valeurs de conductivit\ue9 thermique des mortiers de PPEN comme des mortiers \ue0 BCVE augmentaient rapidement lorsque l?HR se situait au-dessus de 90 %. Cependant, le taux d?accroissement de la conductivit\ue9 thermique des mortiers de PPEN a \ue9t\ue9 apparemment plus \ue9lev\ue9 que celui des mortiers \ue0 BCVE. Nous esp\ue9rons que les constatations issues de cette \ue9tude aideront \ue0 mieux comprendre la performance thermique in situ du mortier \ue0 BCVE qui est utilis\ue9 dans la construction des enveloppes de b\ue2timent dans les r\ue9gions chaudes et humides du sud de la Chine.Peer reviewed: YesNRC publication: Ye

Sorption and Thermal Properties of Insulating Mortars with Expanded and Vitrified Small Ball