Abstract: An uncured cementitious dough or paste, which is substantially free of particulate components having a diameter greater than 100 microns, said paste comprising in admixture;(a) At least one hydraulic cement;(b) at least one polymer latex, the polymer being present in an amount of 1 to 20 parts by weight per 100 parts of the cement;(c) total water in an amount from 8 to 20 parts by weight of water per 100 parts by weight of cement.A cured cementitious composition may be produced by heating said dough or paste at a temperature of above 100.degree. C. and may be used for products such as roofing elements, for cladding the exterior walls of buildings and other building products.

Abstract: An uncured cementitious composition comprising in admixture:(a) at least one hydraulic cement;(b) at least one reactive water-soluble polymer which is capable of providing a viscous solution in water at low addition levels;(c) water in an amount of from 10 to 25 parts by weight of water per 100 parts by weight of the cement; and(d) a water soluble cross-linking agent capable of effecting chemical cross-links between molecules of the said polymer in the presence of the cement and water.