Strengthening of heritage buildings by means of grout injection - problems and solution

Abstract eng:
Many heritage buildings in Slovenia were built of stone or a mixture of stone and brick; until the 20th century the local stone represented the cheapest and most accessible building material. An efficient technique for improving the mechanical properties of the walls of such buildings is grout injection. Because of a lack of knowledge of the morphology and type of walls, incompatibility of existent and applied materials, errors during application, mistakes and even damage, may occur. For this reason, the methodology of work and the criteria to achieve a required quality should be defined. Based on the results of an extensive test campaign, chemical, physical and mechanical criteria for selecting optimal grout mixtures are given; the guidelines and research needed to assess the condition and type of walls that could be strengthened by means of grout injection and to ensure the quality of executed work, are also presented here.

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