Durability of steel reinforced grout composites

Abstract

Mortar-based composites have proved effective for the external strengthening of existing structures and have already been widely applied in the field. To date, however, their long-term performances have not been sufficiently investigated, even if they are of the utmost importance for mitigating the risks and the costs associated to damage and repair/substitution. This is crucial for the sustainability of the building stock and of the rehabilitation measures developed for its lasting safeguarding. This paper collects the studies performed on the durability of Steel Reinforced Grout (SRG) systems, comprising ultra-high tensile strength steel textiles and inorganic matrices. Brass and zinc coated steel cords have been tested after accelerated artificial aging in saltwater solutions, salt mist, acid solutions and freeze-thaw cycles. Laboratory investigations include tensile and bond tests. Available results are discussed to make the point on current state-of-knowledge, contribute to the improvement of artificial aging protocols and test procedures, and promote future research and standardization activities.