Abstract：Adding a certain amount of recycled powders in dry-mixed masonry mortars which the fine aggregates were manufactured sand and recycled sand to change its performance,and the effects of different dosage of recycled powders on the basic properties, mechanical properties and frost resistance of dry-mixed masonry mortars were researched. The results show that the performances of the mortars are decreased with the increase of the amount of recycled powders, and the effects are nearly the same between the two different fine aggregates. The compressive strength of mortars with mass fraction of 30%recycled powders has the biggest reduction compared with that of without recycled powders,which is 44.2%. The effect of recycled powders on the frost resistance of dry-mixed masonry mortars is more obvious, and the maximum mass fraction is not more than10%. The mass ratio of binder to sand of the mortars which the fine aggregate is manufactured sands is 1 ∶3 or 1 ∶4. When the fine aggregates is recycled sand, the ratio should choose 1∶3.

Keywords: recycled powder; dry-mixed masonry mortar; basic property; mechanical property; frost resistance