how do one tackle cracks in the colum.

Dear akinwumi
It depends really, every situation is different but the most likely thing is the sheer weight of the building itself causes the ground beneath it to give way and slowly but surely the building sinks into the ground. Some areas of the building sink faster than others, and when this happens it generates cracks in the mortar joints and sometimes in the brick/block themselves.

Lasting solution is its maintenance so the length and depth of all cracks should be measured. The aesthetic requirements of an individual application should be assessed and where necessary colorant may be added to the Rendacrete LW.