An experimental study and axial tensile constitutive model of the toughness of PP-SACC for rapid repairs

To improve the economic benefits of engineered cementitious composites and control repair cycle, materials were designed, with key components mixture being low-cost polypropylene (PP) fibers fast-setting sulfoaluminate cement. The effects water/binder ratio, fiber content, aggregate particle size on flowability, mechanical properties, toughness fiber-reinforced composite (PP-SACC) explored. Based experimentally measured axial tensile stress–strain curves, a constitutive model PP-SACC was derived in terms content ratio. Additionally, correlation coefficients representing relationships indices properties explored based revised gray relational analysis. Test results indicated that ratio most important factors affecting toughness, fluidity material; contrast, influence slight. an 75 µ m, 0.30, 3.0% demonstrated excellent degree exhibited flexural hardening phenomenon under bending load.