Electric or gasoline powered circular saws fitted with metal bonded diamond blades are used to saw the joints in concrete. Sawed joints are uniform and straight with sharp edges. Water is used as a coolant for the blades to dissipate frictional wear. The saw cut joints are cleaned and sealants are injected to fill the gap.
Control joints are cut into asphalt at standard interims to control splitting. Cement and black-top have generally powerless rigidity, and regularly frame splits as they age, recoil, and are presented to natural anxieties (counting worries of warm development and compression). Without the control joint, breaking can happen in an arbitrary manner, and bargain the surface of the structure. This is basically a stylish issue.
Control joints lessen the breaking in a more controlled manner. The splits will tend to frame along the cut planes that makes up the control joints. This even, standard splitting, which is additionally covered up in the cleft of the joint, has a superior appearance than irregular hairline breaks.
Accordingly, extension joints decrease breaks, incorporating into the general structure, while control joints oversee splits, basically along the visual surface.