On hygric properties of blended plasters for building renovation.

Two renovation plasters with blended binder based are presented in this paper. The porosity of plaster was increased by the application of expanded perlite. This lightweight aggregate was used alone as well as in combination with ordinary silica sand. Binder of plaster composed also of two kinds, pure lime were supplied by ceramic powder. This pozzolanic material led to improvement of mechanical properties and therefore should compensate for their lowering caused by plaster lightening. Physical properties such as basic physical, mechanical and durability characteristics were determined, and the results are discussed in this paper. The plaster with lightweight aggregate reached desired high porosity and appropriate water transport characteristics to be applicable in the field of building renovation, while the combination of silica sand with lightweight aggregate showed the water absorption coefficient slightly lower than the requirements of the standard. [ABSTRACT FROM AUTHOR]