The Brew Cabin

Posted: **Wed Mar 16, 2005 11:09 pm**

Due to a "change of plans" by the Client, I've been left with a huge pile of loose DoT Type I limestone which I no longer need. I need to lay an area of concrete for a small residential car park at the front of the building... and I'm loathe to grab up the limestone and move it elsewhere due to the transport costs.

If I mix, say, 7 parts of Type I to 7 parts of sand and gravel mixed/20mm ballast to 4 parts of OPC, would this make a reasonable concrete on which I could then add a more conventional concrete mix with finer aggregates for the finished surface ?

Any comments would be very welcome.

Cheers,

Barry.

Posted: **Thu Mar 17, 2005 5:13 pm**

What depth of bastard mix do you propose and what depth of 'proper' mix would be used to top it?

If this was going to be summat like 50-75mm of the bastard mix with 100mm of 30N concrete over the top, that shouldn't be too much of a problem. It's the overall strength of the completed structure that's imporatnt, and with this being a car-park rather than a private 1-car driveway or shed base, you can't really afford to cut too many corners.

Surely you'd need some of the DTp1 as a capping/improvement/sub-base layer beneath the proposed concrete slab?

The Brew Cabin

Limestone concrete mix ? - The viability of limestone in concrete..