Tag - flexible cover blocks

Why we choose to use concrete spacers over those made of plastic, granite stone…?

Plastic spacers

Plastic spacers do not bond well with concrete. When the concrete is poured into the form, a small gap is created between it and the plastic. Plastic has a coefficient of thermal expansion and contraction 10 to 15 times that of concrete, and when subjected to temperature variations, the plastic continues to expand and contract at that higher coefficient. At high temperatures, plastic can even melt. The result is a separation between the spacers and the poured concrete, […]

Cover blocks

Cover blocks overview

What are cover blocks?

Cover blocks are used to maintain a specified
distance between the TMT rebar and the
shuttering. (Cover blocks for slab)




Why we must use cover blocks?

– When doing RCC work it is important to
embed the steel in the concrete (also known
as cover) so that the rebar doesn’t corrode
and to provide fire protection to the rebar.

– If we don’t provide the recommended cover
the rebar will corrode with time and will
ultimately result in premature failure of the
– Thus […]