Abstract
Bonding of external reinforcement is currently the simplest, fastest, and most popular method of strengthening concrete and masonry structures. Glass and carbon organic fibers are the dominant materials used, but alternatives also include high-strength steel wires. The mechanical properties of such steel are comparable to those of carbon fiber. Due to their good compatibility with mortars, steel wires are particularly well suited to the revitalization of historic buildings. The manuscript provides an overview of research and experience in the use of steel-reinforced polymers (SRPs) and steel-reinforced composite mortars (SRCMs, also called steel-reinforced grout (SRG)) for structural strengthening. The examples described are for concrete beams, slabs and columns, walls, and masonry arches. The results of laboratory tests are discussed. The summary presents the advantages and disadvantages of composites based on ultra-high-strength steels compared with more popular carbon fiber composites.
Highlights
Steel-reinforced polymers (SRPs) were introduced to structural engineering applications in 2004 as an alternative to externally bonded organic-fiber-reinforced polymers
Like other FRPs, tapes can be bonded by using epoxy or polyester resin, obtaining steel-reinforced polymer
Minnaugh [58] reported better fatigue behavior of steel-reinforced polymers (SRPs) tapes compared with CFRP
Summary
Steel-reinforced polymers (SRPs) were introduced to structural engineering applications in 2004 as an alternative to externally bonded organic-fiber-reinforced polymers. Outstanding strength properties make SRP composites comparable to carbon-fiber-based strengthening systems. This manuscript aims to review the current research on SRP as a material for reinforcing concrete, masonry, and timber structures. Ultimate values are measured for the cracked stage, which means that the mechanical properties are mainly governed out on most popular 3X2 single cords either dry strips of textile [2,3,4,5,6,7] or show strength ranging from 2440 to 3302 MPa, an ultimate strain ranging from 1.6% to 2.2%, and Young’s modulus ranging from 183 to 206 GPa. For less popular 3SX and 12x cord types, the strength parameters are slightly better: strength reaches 3311 MPa [4], and Young’s modulus 216 GPa [3]. The degradation of the interface between the fiber and the matrix was observed in both moisture and alkaline environments
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