Hovis builds a garden office*

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NotThamesWater in reply to @mespilus

In the UK the general rule of thumb is that rebar must have 50mm of 'cover',

the reinforcing steel must have 50mm of concrete between it and the atmosphere to prevent the steel being exposed to moisture and oxygen to prevent the formation of rust.
Rust is lower density than the parent steel, and exerts a concrete splitting force as it forms.

So you're saying use GFRC then...

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mespilus in reply to @NotThamesWater

GFRC = glass fibre reinforced concrete?
The ridges in rebar prevent the drying/curing concrete shrinking as much as it would like,
putting the concrete in compression, where it is much stronger than in tension.

I seem to remember reading about concrete being reinforced with materials other than steel in structures where light(er) weight was required, bridge sections.

For a concrete slab rebar and mesh is so cheap it is hard to argue against,
as long as you have adequate cover, the frameworks is sturdy enough,
and the wet/liquid concrete is vibrated enough to avoid voids.

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NotThamesWater in reply to @mespilus

I was kidding! I've been looking at GFRC furniture recently.

Interesting to read that about rebar though.
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cheekysnaker in reply to @mespilus

Glass fibre reinforcement can be regularly seen in tunnel soft eyes in retaining walls where a TBM will be breaking through.

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