SEISMIC RETROFIT OF MASONRY WALLS USING REPOINTING WITH TRADITIONAL MORTAR AND POLYPROPYLENE STRIPS - TEST RESULTS

Seismic strengthening of masonry structures through repointing is recognized as an effective and economical technique for increasing structural stability, especially in regions with high seismic activity. This paper presents results from a research program that includes laboratory tests of the mechanical properties of masonry and its components: bricks, mortar, and polypropylene strips. The aim of the research is to assess the effectiveness of repointing as a method for strengthening existing structures, ensuring greater resistance to compression and dynamic loads. The results show that repointing, particularly when modern materials are used, significantly increases the compressive strength of masonry structures and their ability to withstand seismic forces. Additionally, the method contributes to the improvement of the long-term stability of structures, making it applicable to a wide range of buildings. The economic analysis of the application of grouting demonstrates that this approach is not only effective but also financially viable, making it a practical choice for construction, with the potential for a significant contribution to the seismic safety of buildings. Keywords: seismic strengthening, masonry structures, repointing, polypropylene strips,compressive strength, seismic resistance