The analysis of waste ashes suitable for modification of lime plaster's salt and freeze/thaw resistance.

The selected ashes were tested to analyse the possibility using them as admixtures that can improve the durability of lime plasters with respect to salt crystallization and freeze/thaw resistance. Coal fly ashes and biomass-based ashes were characterized by their chemical and physical properties. Pozzolana activity was also determined using Frattini and Chapelle methods. The samples were different from each other by specific surface, particle size distribution, and chemical composition. All tested ashes can find use as pozzolana active admixtures with power to enhance durability of lime-based plasters that might be used in repair of historical masonry, rendering and plastering materials. [ABSTRACT FROM AUTHOR]