The fundamentals of making good concrete have been known since the nineteenth century, but not often
used in reinforced concrete because of the difficulties of placement, compaction and curing. Poor quality
control led to rusting of the reinforcing steel and spalling (chip, crack or flack) of the
concrete cover.

To eliminate this weakness it is essential that the reinforcing bars be surrounded by sufficient
impermeable concrete to stop them from rusting. If moisture and/or air penetrate the concrete the
reinforcing will then rust and expand, which will encourage the concrete to spall and reinforcing
to be exposed.

PCP Concrete Spacers Ltd, manufacturers of concrete spacers continue with an ongoing research and
development program allied to production testing which keeps our product as the leader in eliminating
the rusting and spalling problem so often seen in other non concrete barchairs. The superior perform-
ance comes from the poured concrete’s ability to bond around the spacer made of such compatible
physical characteristics.

PCP Spacers or Bar chairs as they are also known, use a waterproofing agent and as can be seen on
the accompanying test report are able to exceed the stated 50 Mpa figure we quote. Click here to view.

PCP Concrete Spacers have been used on the following projects:
Eden Park South Stand
Te Papa Museum of New Zealand used 180,000 PCP Concrete Spacer Blocks
Sky Tower and Casino used 250,000 PCP Concrete Spacer Blocks
Newmarket Viaduct
Pohoi Toll Bridge
Mangere Bridge