<p>A paving material for filling gaps between paving blocks or the like, the paving material comprising a powdered or granulated mixture of: inert particulate; a water-soluble resin formable from a polymerisation reaction between formaldehyde and an at least difunctional nucleophile; and a water-soluble acid. The paving material is filled into gaps between blocks and then liquid water is applied thereto, or the sand is exposed to ambient humidity (gaseous water). Upon contact with the water, the resin coats the sand and then sets hard, thereby stabilising the block paving.</p>
