The blocks must not be cut to match the bond pattern, which will be detrimental to the accuracy, strength and quality of the masonry. The mould must allow manufacturing full size blocks and 3/4 and 1/2 sizes.It should be quite fluid in order to be workable. The binder should be a cement-soil-sand (1: 1: 3) mortar of 5 mm thick.Good seating of the blocks on top of each other for properly transmitting the load bearing: All the block area, including the key, must transmit the load.Every course must interlock with each other as well as the header of every block in length: to increase the shear strength of the masonry.They should interlock especially well in the length of the wall, which is subject to the shear stress of the earthquake. The interlocking keys must interlock transversally and longitudinally to the wall.Blocks should be hollow and the vertical holes and U shaped blocks should allow casting RCC, according to requirements: To reinforce regularly the masonry vertically and horizontally.
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