Short Fibers, Big Gains: Advancing Masonry Shear Performances with PVA-Fibers Enhanced FRCM

The inclusion of polyvinyl alcohol (PVA) short fibers in fabric-reinforced cementitious matrix/mortar (FRCM) offers a promising approach to enhance the structural performance of masonry wall under shear stresses. This study investigates the influence of short PVA fibers on the shear strength and failure mechanisms of masonry panels retrofitted with a FRCM systems (geo-polymer + glass fiber fabric). A series of experimental tests were conducted to analyze the mechanical interplay between the FRCM matrix and fabric, the embedded fibers, and the masonry substrate under applied shear loads. The results demonstrate that the addition of short PVA fibers significantly improves the ductility and energy dissipation capacity of the strengthened panels (over the contribution of the FRCM-fabric). By bridging microcracks and delaying their propagation, the fibers enhance the composite action between the FRCM system and the masonry, leading to a substantial increase in shear strength compared to panels without PVA-fiber reinforcement. The findings also reveal that the short-fibers mitigate brittle failure modes, promoting a more gradual and predictable failure response. This research highlights the synergistic effects of PVA fibers within the FRCM matrix and fabric, offering critical insights into their role in improving the resilience and durability of masonry structures. These advancements position PVA-enhanced FRCM systems as an innovative solution for the sustainable strengthening and preservation of masonry buildings, particularly in seismic regions. Future studies may focus on optimizing fiber content and exploring long-term performance under dynamic loading conditions.