In deciding on the quantities of materials required for a job it must be remembered that the volume of the mixture will be reduced by approximately 30 per cent when water is added during mixing.
Ekugqibeni kubungakanani bezinto ezifunekayo emsebenzini makukhunjulwe ukuba ubuninzi bomxube buyakuphungulwe kangangeepesenti ezingamashumi amathathu xa amanzi egalelwa ngexesha kuxutywa.