Mechanical Behavior of Fiberglass-Reinforced Cementitious Composites at Low Fiber Concentrations

This study evaluates the mechanical performance of cementitious composites reinforced with fiberglass at different concentrations (0.01%, 0.025%, 0.05%, and 0.1% w/w). Specimens were prepared and cured under standardized conditions to ensure statistical reliability and reproducibility. Axial and diametral compression tests demonstrated that fiberglass concentration significantly affects mechanical strength. The optimal content of 0.05% (w/w) achieved the best results, with axial and diametral strengths of 5.24 MPa and 0.52 MPa, respectively, attributed to uniform fiber dispersion and effective load transfer within the matrix. In contrast, higher concentrations (0.1% w/w) led to strength reduction due to fiber agglomeration, compromising structural integrity. These findings highlight fiberglass’s potential as a cost-effective reinforcement material that enhances concrete’s mechanical performance and durability. Moreover, the results provide practical insights for optimizing composite formulations in sustainable construction applications and suggest future research on durability and cost-benefit analysis.