Abstract：With the development of modern construction industry and people's growing concern on the living environment, dry-mixed mortar has been rapidly developed due to the promoting of national policy. People's research on the dry-mixed mortar mainly focused on the varieties and properties of dry-mixed mortar with natural sand, and a little researches on dry-mixed mortar with manufactured-sand were carried out. Eight groups ( 1 ~ 8) of different particle sizes grading of manufactured-sands for dry-mixed mortars were investigated, in order to know the influence of the grain grading of manufactured-sands on the mechanical behaviors of dry-mixed mortar. The test results showed that the consistency of dry-mixed mortar increased with the decreasing of stone power content and the consistency were more appropriate as the stone power content at 5% ~ 20%. The compressive strength and flexural strength of dry-mixed mortar decreased and the ratio of compressive strength to flexural strength decreased too, when the stone power content decreased and the flexibility were better as the stone power content less than 20% than other groups. The bonding strength of the mortar to polystyrene and ceramic tile first increased and then decreased and the bonding strength was bigger as the stone power content at 5% ~ 20% than other groups. Thusly, the overall performances of dry-mixed mortars with manufacturedsands were good as the stone power content at 15% ~ 20%.

Keyword：manufactured-sand;grain grading;dry-mixed mortar;mechanical behaviors;