masonry mortar is used to bond various types of bricks: red clay bricks with low water absorption, lime sand bricks with strong water absorption and aerated lightweight concrete. generally speaking, bricks with low water absorption require a thick coat of mortar with low water retention, while smooth, flat bricks with high water absorption require a thin coat of mortar with high water retention. din 18555part 1-9 describes the inorganic test methods for binder mortars. most of them are suitable for use in masonry mortars as well as cement-based renders and gypsum-based mortars.
typical formulas for masonry mortars and air-entrained lightweight concrete adhesives(by weight percentage)
ingredients masonry mortar aerated lightweight mixconcrete adhesive
cement(for examplecemi32. 5r) 12-20 36
hydrated lime 0-6 4
0-0． 1mmlimestone powder10-20 -
0-4mmquartz sand or limestone sand60- 80 -
0 -0． 5mmquartz sand- 60
air-entraining agent 0.01-0.03 -
medium viscosity methylcellulose ether 0.02-0.04 -
high viscosity methyl cellulose ether - 0.3-0.4 </p
