A local clay quarry has a housing estate built over it and it was filled by
that black klinker slag stuff then concreted over. I note its starting to
sink now after 50 years.. Oops.
Brian

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"David" wrote in message
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On Sun, 10 Nov 2019 01:53:58 +1100, FMurtz wrote:

Probably different costs to here in Australia, but what would the
cheapest stuff to use for concrete aggregate for non important garden
shed floor? In grandfathers day they used to use some sort of ash (fly
ash?)or was it crushed slag/

Most of the UK has sand and gravel quarries fairly close, so ballast (a
mixture of sand and gravel) is as cheap as anything else.

Possibly false economy, but then again I think you have more coal fired
power stations than we do.

Fly ash is very fine (not like an aggregate). I assume that you need the
lumps for strength.

I remember it being packed down beside a concrete gully under a dual
carriageway because it was very light and could be compacted to exert very
little side pressure on the concrete.

Also at one time proposed for spreading on marine oil spills to clump up
the oil.

As far as I know modern power stations grind the coal up very fine to make
it burn more efficiently so you probably don't get slag any more.

Cheers



Dave R

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