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in place of the thermosetting organic matrix (usually epoxy) employed for FRP strengthening overcomes some important issues such as the degradation attributable to ultraviolet (UV) and high-temperature exposure and the lack of permeability relative to the concrete substrate.The literature regarding FRCM composites is still very limited, and a comprehensive study of the stress-transfer mechanism in FRCM-concrete joints is not available. The limited number of studies published report that FRCM-concrete joints fail because of debonding of the fibers within the embedding matrix (Carloni et al. 2013;D'Ambrisi et al. 2012D'Ambrisi et al. , 2013a. The debonding process is complicated by the so-called telescopic behavior, a mechanism that leads to a differential slip of the fiber filaments within the fiber bundle principally because of the different matrix impregnation of the outer filaments with respect to the core filaments (Banholzer 2004).The study of the stress-transfer mechanism between the composite and the concrete substrate is of fundamental importance to determine the load-carrying capacity of FRCM-concrete joints. The stress-transfer mechanism between the fibers and the surrounding matrix has been recently studied using a fracture mechanics approach assuming that the shear stresses transferred from the embedded fibers to the two matrix-fiber interfaces are equal (D'Ambrisi et al. 2012;D'Antino et al. 2014). This paper examines this as-sumption and the role of each matrix layer in the stress transfer.

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