خصوصیات پتروگرافی پارتیشن بندی دیوارهای ساختمانی قرن نوزدهم

The structures rehabilitation involves a rigorous pathological diagnosis defining the conservation state and possible impact of those pathologies in the structure. This work is focused in aerial and hydraulic lime mortars and gypsum plasters petrographic study of a building from the 19th century existing in Felgueiras, Portugal. This building is representative of the buildings that was built in same period in this city. The mechanical and water absorbing behavior of mortars is important to know the mineralogical composition of the mortars, as well as, identify the pathologies and rehabilitation techniques adequate to contain the problems that may occur in the mortars and consequently on the structures. The case-study building is a typical masonry structure building with lime mortars, with wood floors and roof. Deterioration caused by capillarity and infiltration is present among other pathologies. A petrographic microscope was used to analyze a sample of a partition wall mortar, allowing to identify the mortar layers, and for each layer the minerals and their dimensions. Also a qualitative study of the binder/minerals volumetric plot and the size of the minerals and of the voids/hollows can be made. The exterior layers have, usually, finer aggregates and higher binder ratios (1- part aggregate to 1, 2 or 7- parts of binder).