DESIGN OF GROUTS FOR STRENGTHENING THREE OR TWO LEAF MASONRY WITH MUD MORTARS

Abstract eng:
This paper presents the experimental procedure that has been followed, with main goal to develop various grout compositions adequate for strengthening stone masonry constructed with poor quality mortars. Two or three-leaf masonry frequently met in historic masonry structures is very vulnerable to environmental and seismic actions, especially when made with mud (very low strength) mortar. Although significant research effort is devoted to the development of grouts adequate for strengthening masonries made with lime or limepozzolan mortar, the respective studies on masonries made with mud mortar are scarce and inconclusive. Within the present work, a comprehensive investigation on mud mortars was conducted on samples that have been selected and sampled from three different buildings and sites, in order to identify their physicochemical and mineralogical properties, as well as their grain size distribution. Based on the studied samples of the aforementioned historical buildings with mud mortars, six wallettes were constructed, in order to study the mechanical properties of the two and three stone masonry before and after grouting. After the construction, non- destructive techniques (radar and boroscopy) were applied for the calibration of the methods and the comparison of the results before and after grouting, with main goal to develop various grout compositions according to the parameters which determine the efficiency of the intervention. Based on the characterization results, various grout mixes will be produced and will be examined in terms of compatibility between the mortar and the grout, as well as

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