Evaluation of the durability and compatibility of traditional repair lime-based mortars on three limestones / Bestimmung der Beständigkeit und der Verträglichkeit traditioneller Repararturmörtel mit Kalk als Bindemittel auf drei unterschiedlichen Kalksteinen

Tests were carried out on lime-based mortars for the reparation of three types of limestone extensively used in French monuments (Tuffeau, Saint Maximin and Courville limestones). The stones differ through their physical properties, both mechanical and petrophysical. The study aimed to characterize the properties of air lime and natural hydraulic lime-based mortars and to compare them to the stones. The durability was assessed by accelerated ageing, pull-off tests and description of the fracture pattern on repaired samples. The results show that such mortars are not equivalent but both are soft, porous and capillary materials with low adhesive force. Compatibility and durability of the repair measures on the three stones are discussed on the basis of our data and according to some requirements taken from the literature