Effect of fiber diameter variation on properties of cement-based matrix fiber reinforced composites

Depending on process route, fibers for composite reinforcement typically have some degree of variation in diameter. This paper examines the effect of varying fiber diameter on properties of cement-based matrix composites such as first crack strength, fracture energy, and ultimate tensile strength. The analytical development of fiber bridging action across matrix cracks accounts for fibers that pull-out and fibers which rupture. Model calculations reveal that within reasonable limits, composite properties should not decay due to fiber diameter variations.