Mechanical properties of fiber-reinforced high-performance concrete incorporating pyrogenic nanosilica with different surface areas

摘要

The aim of the present study was to investigate the effect of pyrogenic nanosilica with different specific surfaces areas (200 and 380 m(2)/g) on mechanical properties of fiber-reinforced high-performance concrete (FRHPC) produced with two different types of fibers including steel and polypropylene fibers. Accordingly, different mechanical tests (compressive, splitting tensile and flexural strengths) as well as electrical resistivity were performed at 7, 28, and 91 curing days. In addition, the modulus of rupture and flexural toughness of FRHPC prisms were calculated based on the flexural, testing results. Also, scanning electron microscopy test (SEM) was conducted to evaluate the microstructural performance of pyrogenic nanosilicas in the matrices of FRHPCs.