Steel Fiber Reinforcement for Extruded Prestressed Hollow Core Slabs
C. Peaston, K. Elliot, and K. Paine
Appears on pages(s):
extrusion; fiber reinforced concrete; hollow core slabs; precast concrete; prestressed concrete; reinforcing materials; shear strength; shear testing; steel fibers
An experimental investigation was conducted to assess the potential of steel fibers as secondary reinforcement in prestressed hollow core slabs. Following a brief laboratory study and a feasibility trial, a series of fibre reinforced extruded slabs were made at the premises of a local manufacturer and subsequently tested in shear: one of a number of potential modes of failures. The Predictive equations of other researchers were shown to accurately estimate the shear strength in the case of plain hollow core slabs, but to overestimate the shear enhancement due to adding steel fibers. Additionally, the effect of the manufacturing process, in which the concrete is compacted by rotating augers, on the fiber distribution and orientation was investigated. Whilst fibers were found to be randomly distributed within the cross-section, a tendency to align vertically within the webs was observed. This has particular relevance to the vertical shear performance.