Study on mechanical properties of E-glass fiber mat reinforced magnesium phosphate cement thin-slab

To enhance the mechanical properties of fiber-reinforced cementitious composites and increase the fiber volumetric content, E-glass fiber mat reinforced magnesium phosphate cement (MPC) thin-slabs were prepared using the laminate impregnation method. The tensile, bending and impact properties of chopped fiber, chopped fiber mat, and continuous fiber mat reinforced MPC thin-slabs were tested, and their microstructures were examined using scanning electron microscopy. The results indicate that the fiber volume ratio of MPC thin-slabs reinforced by fiber mat can reach 18%, with fibers evenly dispersed in the cement matrix and exhibiting strong bonding with the matrix. The anchorage effect of long fibers within the cement matrix is the best, so the tensile strength, bending strength, and impact strength of MPC sheets reinforced with continuous fiber felt are more than twice that of MPC thin-slabs reinforced with short fibers, demonstrating a significantly enhanced strengthening and toughening effect. Furthermore, at the same fiber volume ratio, the tensile strength and bending strength of MPC thin-slabs reinforced by continuous fiber mat can be enhanced by utilizing lightweight fiber mats and increasing the number of layers; however, the improvements in impact strength and toughness are not as pronounced.