Systems and methods for reinforcing physical structures with composite reinforcement systems are disclosed herein. According to aspects of the present disclosure, a composite reinforcement system includes a carrier formed of a plurality of fibers and a blend of at least two reagents impregnated within the carrier. The at least two reagents are chemically configured to react to form a moisture-curable prepolymer. One reagent of the at least two reagents is an isocyanate, and another reagent of the at least two reagents is an aromatic-group-containing polyol.