Types of Concrete Blocks or Concrete Masonry Unit: Hollow ...
In general practice for hollow concrete blocks the face thickness must be at least 5 cm (2") and the net area must be 55 to 66% of the gross area. And the mortar used has a cement aggregate mix in 1:6 proportion. the blocks used for structural purposes should be at least 3 N/mm2( 450 lb /in2).
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