Building pathology and environment: Weathering and decay of stone construction materials subjected to a Csa mediterranean climate laboratory simulation

• Surface erosion bring to light underlying layer with different features respect than the old ones. An ultrasonic quality index (vri) between good and very was detected after ageing. Secondary calcite patina could increase hardness of sample. roughness regulates gas-driven permeability. Building stone materials have satisfy long-term durability requirements in environments terms mechanical strength resistance aggressive conditions. Several studies field observations show that weathering on geo-materials is related average annual precipitation temperature. The decay also depends salts air/soil concentrations biological agents, but more harmful impact given by greenhouse gas (e.g. CO 2 , SO X NO O 3 ). These last induce acidification rain runoff waters. Nowadays, prediction required order estimate behaviour over time. This research represents a second part previous work where response some construction used ancient contemporary architecture cultural heritage has been evaluated laboratory simulation hot-summer Csa Mediterranean climate. Simulation consists accelerate ageing test climate chamber reproducing macro daily seasonal cycles temperature, relative humidity, air concentration) micro rain, soil capillary rising) environments. Some non-destructive testing were executed evaluate physical–mechanical “decay markers” before Test caused both decreasing increasing Leeb D hardness, decreases permeability general decrease speed, mainly due formations patinas, crusts efflorescences surfaces.