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This work investigates the use of pyrophyllite admixture as a partial replacement of cement of hydraulic concrete elaborated with Portland cement, water, silica sand, pyrophyllite and a rate of polypropylene (PP) fibers set at 1% vol. Effect of pyrohyllite with a rate of replacement ranging from 10%, 20%, to 30% by mass of cement on the physical-mechanical properties of fiber reinforced concretes is studied. In the fresh and hardened state, the density of concrete decreased with increasing the rate of pyrophyllite. Moreover, regarding reference concrete without pyrophyllite, their compressive, splitting and bending tensile strength is very high and increase significantly over time. In addition, the pyrophyllite improves the mechanical strengths of concrete especially with the rate of 10% approaching without exceeding that of the reference concrete up to 28 days.
