Design of jointing mortar compatible with the masonry of the Villa Maheddine of the “Ottoman era”

Abstract eng:
The estate villa Mahiédinne is a historical monument belonging to the municipality of Sidi M'Hamed (Wilaya of Algiers) which dates back to the Ottoman era. The field of villas is in a state of advanced degradation, with defects in the plaster, cracks, the use of poor jointing mortar and the use of coating with cement, being apparent. This work aims to address some of the damage by making a jointing mortar compatible with the masonry used. The basic mixes are composed of sand (0/3), tuff (the percentage of which is calculated to have a continuous size distribution of mixed sand + tuff), air lime (CL90), and a series of mortars based on mixed hydraulic lime NHL2 and NHL5, and a series of mortars based on cement CPJ-CEM II 32.5 and 42.5. Mortars were prepared with superplasticizer (MEDAFLOW 30). The consistency of the mortars, setting time, compressive strength and flexural strength where all analysed and compared. Following the results, the mortar made from air lime seems to be the most appropriate or closest to the historic masonry, although it has a relatively low mechanical strength. This handicap can be improved by adding to the composition a certain percentage of hydraulic lime; the content of which varies depending on the environment and characteristics specific to a building.

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