The main objective of this research project is to carry out a theoretical-experimental study of dry cement mortars. Particular emphasis will be placed on the experimental part to determine the optimal dosage of dry mortars for different types of use in construction: exterior plaster, brick walls, concrete blocks, interior plaster of water tanks, waterproofing of terraces and placement of ceramics. For each product, the technical specifications for use will be drawn up: description, method of use and recommendation, presentation - storage and mechanical properties.