A light grey Portland-limestone cement conforming to BS EN197-1 type CEM II/A-LL 42,5N. Packed Portland-limestone cement is suitable for most general concrete applications. Available as a dry powder, it is used in a wide variety of applications where severe chemical or thermal attack is not likely to be encountered. It is available In 25kg moisture resistant paper sacks. We recommend using a ratio of 3:1, grit sand to cement. That is 3 bags of grit sand to 1 bag of cement. In terms of tons this is 750kg of Grit Sand to 10 x 25kg bags Of Cement, will cover approx 10m2 at a depth of 50mm.