Perforation of plain and fibre reinforced concretes subjected to low-velocity impact loading

✍ Scribed by Sidney Mindess; Cheng Yan

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 971 KB
• Volume: 23
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(93)90138-y

✦ Synopsis

Small circular concrete plates, with a diameter of 245 mm and a thickness of 25.4 mm, were cast using plain concrete, steel fibre reinforced concrete, and polypropylene fibre reinforced concrete. These plates, supported by a circular ring, were subjected to impact loading at their centres by a 5.5 mm bullet-nosed indentor, which formed the striking point of a large, instrumented drop weight impact machine. The total mass of the drop weight was 345 kg, with impact velocities ranging from 1.34 to 2.67 m/s. It was found that 0.5% by volume polypropylene fibres had little effect on the peak loads, but increased somewhat the energy required to perforate the plates. However, 1.0% by volume steel fibres led to a significant increase in both peak loads and fracture (perforation) energy.