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what is raking and why it is provided in mortar joint in brick masonry
http://dictionary.reference.com/browse/rake
it's not provided in mortar joint in brick masonry, you remove the old mortar between the bricks to a suitable depth and repoint with fresh mortar taking into account materials and building codes.
http://dictionary.reference.com/browse/repoint
http://dictionary.reference.com/browse/point
definition 10 in the verb section
Try doing your own homework......I recognize the questions from my own school days!!
Raked joints in brickwork are also known as the mason's full employment act.