US Patent 7910162 Grout for laying paver stones and method of use

A dry, non-shrink composition which is admixed with water to cure into a hard but flexible and non-shrinking grout for laying paver stones, the dry composition comprising ingredients by percent weight of: 94-96% silica sand; 2-4% polymer powder mixture of vinyl acetate, and a vinyl ester in equal proportions, jointly polymerized using ethane; 0.5-1.5% cement; and 0.5-1.5% colorant. The dry composition is swept into joints between paver stones and water is then added to hydrate the dry mixture which forms a grouting material with interlocking physical joints to a porous material such as travertine.