Assessment of flexural toughness and impact resistance of bundle-type polyamide fiber-reinforced concrete

作者：Kim Hongseop; Kim Gyuyong^*; Gucunski Nenad; Nam Jeongsoo; Jeon Joongkyu

来源：Composites Part B: Engineering , 2015, 78: 431-446.

DOI：10.1016/j.compositesb.2015.04.011

• Fibres
• Mechanical properties
• Fracture toughness
• Fibre/matrix bond
• Impact behaviour

This study compares the fiber/matrix bonding strength and flexural properties of bundle-type polyamide fibers to those of hooked-end steel fibers. Their fracture behavior upon impact with a high-velocity projectile is also assessed in terms of penetration depth, crater diameter and rear-side scabbing. The results obtained demonstrate that the bundle-type polyamide fibers undergo fracture without fiber pullout because of the increased interfiber gap and specific surface area for bonding, but exhibit poorer flexural fracture behavior with a lower flexural strength and fracture energy when compared to hooked-end steel fibers. Yet despite this, concrete reinforced with bundle-type fibers is shown to more effectively suppress scabbing during high-velocity impact, which is attributed to a more efficacious dispersion of shock stress due to the increased number of individual fibers.

• 出版日期2015-9-1