Analysis of the influence of fine aggregate type on the characteristics and dosage of mixed mortars

Abstract Coating mortars and plastering masonry using artificial sand from crushing has become a viable alternative in recent years, however, there is widespread disagreement with regards to the adequate dosage of materials. The objective of this project was to study coating mortars and plastering masonry with artificial crushing sand and natural sand, in order to evaluate the effects of these aggregates on fresh and hardened states properties under analysis of a more efficient mix design process. The samples were tested for incorporated air content, resistance to compression, traction in flexion and grip, modulus of elasticity; water absorption; porosity. Cracking and statistical tests were performed in three age groups (14, 28 and 85 days). CPII-E-32, CH-I lime, artificial crushing gneiss sand and natural quartz sand were used. The results showed that the artificial aggregate is suitable for use in mixed mortars. The study demonstrated that the type of mortar significantly influences the properties analysed and and that it is necessary to have a dosage method that considers those conditions in order to obtain good-quality mortars that are suitable to the conditions of use.