ABSTRACT
The chapter describes the behaviour of three-leaf stone masonry walls with a rubble inner layer under compression loading. It presents the results of a series of non-destructive tests carried out on a semi-technical scale on 3 wall specimens measuring 0.4 x 1.0 x 1.8 metres. Compression stresses in the external leaves were measured using a flat-jack device. According to obtained test results compression stress in external leafes was reduced up to 97%. A series of non-destructive tests were carried out on masonry walls before-and-after strengthening by means of injection of trass-based mortar into a core of loose material as part of research project investigating strengthening of historic three-leaf masonry walls. Estimates of the degree of redistribution of stress before-and-after injection provide important information concerning the strain to which the external leaves are subjected following an intervention, which enables estimation of the reserve in loading-bearing capacity.
