Mechanical and durability properties of repair mortar with recycled aggregate graphene oxide addition

This paper evaluates the influence of 0.05% and 0.10% graphene oxide (GO) addition on the mechanical and durability properties of repair mortar produced with cementitious construction and demolition waste as recycled aggregates (CDW–mortar). For this, an experimental campaign with 48 specimens was carried out, and consistency, compressive strength (CS), flexural tensile strength (TS), dynamic modulus of elasticity (Ed), porosity (P), water absorption (WA), and carbonation depth (Cd) of CDW–mortars were studied. The results indicated that replacing 100% natural aggregates with recycled ones can provide mortars with comparable CS (up to 0.9% greater) and that adding 0.05% GO can mitigate the worsening of TS (up to 9.7% increase compared to CDW–mortars without GO addition), Ed (up to 5.6% increase), P (up to 44.5% reduction), and WA (up to 6.4% reduction) provided by using CDW aggregates. From these properties, only P and WA presented statistically significant differences.