TENSILE BEHAVIOUR OF MULTI-PLY STEEL- REINFORCED GROUT (SRG) COMPOSITES

Abstract

Steel Reinforced Grout (SRG) composites consist of Ultra High Tensile Strength Steel (UHTSS) fabrics embedded in an inorganic mortar matrix. The use of SRG for the repair and retrofitting of deficient structures has emerged as a novel technique in the last few years. This paper discusses the results of a comprehensive experimental study on the tensile behaviour of multiply SRG composites. A total of 24 direct tensile tests were conducted on SRG coupons to assess the influence of the fabric’s layout and architecture on cracking and overall tensile behaviour. Two main parameters were investigated, including the number of fabric layers (1, 2, and 3 layers) and the density of the steel fabric (4 and 8 cords/in). It was found that, although the grout contribution is significant up until failure regardless of the number of layers, the ultimate strength of the composite is generally governed by the ultimate strength of the fabric. The large amount of densely distributed cracks that developed throughout the length of the coupons suggests that a good bond could develop between the fabric and the grout, possibly as a result of the geometry of the twisted cords and the development of good mechanical interlock.