old terracotta slabs (Watchet TA23)

These old terracotta slabs, 12" square and at least 1" thick, were taken up from a floor inside a house we are renovating. They were "stuck down" direct onto earth with lumps of cement, as seen on the second picture, and some have a sort of compound on the top, perhaps self levelling? There are quite a number of them and are free to collect but we will need some notice to clear access. Hoping someone will find a use for them before we have to disposed of them. COLLECTION IS FROM WATCHET.