Abstract
Modern repairing and retrofitting methods for existing structures make use of composite materials, consisting of high strength textiles and a matrix, which can be either polymeric or inorganic.
These kinds of techniques are largely applied to masonry structures, since they significantly improve structural performance with a small increase of weight and a minimum invasiveness. However, the application of organic gluing agents on masonry has revealed some well-known drawbacks, which are almost all overcome resorting to inorganic matrixes, namely cement or lime mortars.
An entire class of composites has been thus identified as TRM (Textile Reinforced Mortars) or FRCM (Fibre Reinforced Cementitious Matrices). Among them, Steel Reinforced Grouts (SRG) are characterized by Ultra High Tensile Strength Steel (UHTSS) cords embedded in mortar matrix and their use to improve the structural performance of existing historical masonry buildings is becoming more and more diffused.
Qualification tests and acceptance criteria for SRG have been defined. SRG system has been studied in terms of mechanical characteristics, experimental application and documents on SRG properties and performances are actually available for both design and research purposes. A lot of work has been done but despite this, some aspects regarding the interaction between steel and mortar matrix systems need to be still investigated.
In this document the results of an experimental campaign carried out on different SRG systems obtained varying the number of cords, the density of steel textile and the typology of mortar matrix (lime based and cementitious) are presented. Experimental investigations have been planned by means of direct tensile tests and lap tensile tests.
Numerical simulations of direct tensile tests are also presented, aiming at identifying some peculiar aspects of the response of such a type of composite systems.
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Roscini, F., Malena, M., de Felice, G. (2022). Experimental Evidences and Numerical Modelling of SRG Systems Under Uniaxial Load. In: Ilki, A., Ispir, M., Inci, P. (eds) 10th International Conference on FRP Composites in Civil Engineering. CICE 2021. Lecture Notes in Civil Engineering, vol 198. Springer, Cham. https://doi.org/10.1007/978-3-030-88166-5_169
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