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It has been well recognized that fiber/matrix interface properties have significant effects on the performance of a fiber-reinforced cement composite, including its fracture toughness, tensile and flexural strength and ductility. Proper characterization of the interface properties via micromechanics models can lead to effective tools for designing high performance and cost-effective cement-based materials. In this paper, a micromechanics model is developed to characterize the interface properties at single fiber pullout level. In the model, interfacial fracture toughness, frictional bond strength and post-debonding slip-hardening coefficient are explicitly accounted for. Fiber rupture and fiber strength reduction due to inclined fiber pullout are also considered. The complete composite bridging stress versus crack opening curve (o,-8 relation) is derived analytically. Implications of the present model on various composlte …