Influence of elastic modulus under uniaxial tension and compression on the first-cracking flexural properties of UHPFRCs

This paper investigated the influence of elastic modulus under uniaxial tension and compression on the first-cracking flexural properties of ultra-high-performance fiber-reinforced concretes (UHPFRCs). The elastic modulus of a uniaxial stress versus strain response curves is defined as the slope of linear portion within the first crack and it refers to the stiffness of the tested material. Unlike metal exhibiting same elastic modulus in both tension and compression, the elastic modulus of UHPFRCs, observed from experimental tests in previous studies, were considerably different, and, they much influenced on the first-cracking flexural resistances from sectional analysis. Relationships between compressive strength and elastic modulus of UHPFRCs were also investigated and discussed.