Interlocking blocks
Mostly they are paver blocks and are mortar less too, they gain the strength due to its interlocking pattern which does not allow movement of blocks within area where they are installed and protected from all corners by concrete band or kerb stones.
Those are used where there is high traffic and doing maintenance or repair can take time.
Interlocking blocks are easy to remove, to be started from one end by making it free.
Example - i want to lay a line below paved area, what happens?
If its installed in mortar, most of the blocks will get damaged during removing and also become unsuitable due to stuck bedding with it.
if its interlock mortar less, opening the one end and removing blocks will ensure all blocks got removed without any damages and the re-fixing will happen faster after completion of underground works.
This can be adopted in Roads where frequent crossing could happen due to changing technologies.
Can be used in foot paths around road and in projects where underground lines are laid - it makes faster repair / maintenance at very fast time due to mortar less joints.
Mortar less masonry
there is nothing like mortar less masonry but termed often used for block adhesive.
In construction of wall using AAC blocks we can use cement mortar or Block adhesive (mortar less masonry).
Block adhesive is nothing but the mortar with fine sand and polymers. polymers in adhesive improves the workability, retain the water, gives good dispersion and reduce water content which improves the strength.
Block adhesive does not required curing like conventional mortar, also it is applied in thickness of 3 to 5 mm which does not look like mortar when we look at wall. hence can be termed as mortar less masonry.
