CONSTRUCTION AGENCIES ARE TOO RESPONSIBLE TO REPAIR THE CONCRETE ROADS AND FOLLOW REPORT ISSUED BY IRC (BULLETIN NO 14) .

Repair to Concrete Roads:-- Damage to a concrete road may be caused by abnormal loading, excessive expansion, defective drainage or washouts in the subgrade, or inadequate support owing to its settlement. Access of water to the subgrade through joints and other cracks, is the commonest cause of failure in a concrete road. Before the repair is carried out, the actual cause of the damage must be determined and necessary steps accordingly taken to cure any basic defect in the subgrade drainage system or design of the pavement. The replacement of the damaged portions of the concrete slab is only necessary when the damaged area is displaced or when the broken pieces are too small to distribute the load on the subgrade without settlement or rocking. Scaling and Crumbling of the surface of the concrete slab is generally due to poor materials or Workmanship. The most satisfactory and convenient remedy is bituminous surfacing or patching. No doubt, bituminous patching is very unsightly. Joints, cracks and small pot holes should be filled in with hot bitumen with course sand after they have been thorughly cleaned. All dirt, loose mortar and dead filler must be removed using a wire brush or compressed air jet . Fine cracks do little harm and are beat left alone unless it is apparent that they extend right through the pavement or their sides are weak, in which case they should be opened out, otherwise no attempt need be made to fill them with bitumen which will not penetrate into hair cracks. Those wide enough to admit grit or debris should be thoroughly cleaned and sealed.