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17 April, 2006

Random queries no. 43

One of a series of genuine search engine enquiries which successfully brought visitors to the Ministry.  Can I help?

What is a possible disadvantage of paving a new road on broken limestone?

I'm not entirely sure what you mean.

If you're planning to use crushed limestone as hardcore under tarmac or paving slabs, there shouldn't be a major problem, though I'd tend to pave over a layer of sand, to get each slab properly seated and level.

If you're planning to route a road over an area of limestone bedrock exhibiting fracturing, I suppose there's a risk that subsurface cracks and channels, even caves, could collapse, especially under the increased loading of vehicle traffic. Is subsidence a known problem in the local area? Talk to the local planning authority.

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