ChatterBank0 min ago
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3:1 is a very strong mix and would have very limited workability. (As well as being expensive).The correct mix for above ground work, using a medium density brick would be in the region of 4:1:1 to 6:1:1 (sand:cem:lime). The lime would act as a plasticiser and increase the workability of the mix, as well as retarding the setting time of the cement.