Where a fine concrete is used, the required in situ crushing resistance should normally be met by using the range of constituent material proportions by weight of cement to total aggregate between 1:4 and 1:5.
The proportions of sand and 4/10 mm aggregate may be varied to allow the easiest compaction and the achievement of the specified finish. For example, where finishing to a fine closed texture is required, proportions by weight of approximately 1:3.5:1 (cement: sand: aggregate) can be acceptable. In order to minimize water demand and where such finishing is not so important (e.g. where thicker in situ floorings are to be applied), constituent material proportions by weight of 1:2:2 (cement: sand: aggregate) can be suitable.