MAK FILL[ Expansion Joint Filler Board ]

In the construction of runways, roads and buildings , involving the casting of concrete in slab form, provision must be made to accommodate the expansion and contraction which occurs with seasonal variations in temperature (in tropical countries these variation may be considerable) It is of utmost importance to use correct joint filling and sealing compounds to preserve the life and evenness of the surface. Normal practice in runway and road construction is to provide both longitudinal and transverse expansion joints of 12 mm, 18 mm or 25 mm width between butting slabs of reinforced concrete at designed intervals, and at intersections with other constructions, e.g. bridges, level crossings etc.

EXPANSION JOINTS AND ITS FUNCTIONS:

A Prevents cracking of concrete slabs during expansion. B Protects the subgrade by providing a water-tight seal thereby preventing percolation of surface water. C Resists entry of foreign matter and maintains free movement of slabs thus preventing damage to slabs. It was formerly the practice to fill expansion joints with bitumen or bitumen filler mixes. Such materials extrude from the joint on the expansion of the concrete slabs and get removed by the wheels of vehicles leaving an open space in the joint after contraction took place. This does not occur with MAKFILL EXPANSION JOINT BOARDS.