ENGINEER INCHARGE PREPARING THE DETAILED ESTIMATE RESPONSIBLE FOR QUANTITIES RECOMMENDED FOR THE USE OF SATISFACTORY REPAIR OF THE ROAD NET WORK DESIGNED FOR THE PURPOSE OF TRAFFIC VOLUME ASSUMED.

It is very essential to examine the water bound macadam carefully before deciding to surface dressing and if the existing surface shows any depressions, potholes , ruts or irregularities exceeding 12 mm or has a steeper camber than 1 in 60,it must be reconditioned and if the surface is not so bad as to warrant resectioning it should be patch repaired a week ot two before the surface dressing is to be started, and left open to traffic. Stone metal of the old untreated road surface should be exposed to a depth of 6 mm to 12 mm to give the binder a better opportunity of penetrating and binding the road however there should be no disturbed stability of the stone metal. As for as the repair of the road work is concerned for estimate purpose there should be proper consideration of specifications for their use and volume of traffic, so assessed for light traffic, medium traffic and heavy traffic. Renewal coat is surface dressing and so applied when the original coat has sufficiently worn out but the road surface is smooth and not rutted, and is usually given before the surface start breaking up and the procedure of application is the same as for the first coat. As for the thickness of premixed carpet is concerned generally 2.5 cm consolidated thick single course premix carpet surfacing with 0.36 cu. mof stone chipping (20mmsize 0.18cu.m.10 mm size 0.12 cu. m. and 6mm size 0.06 cu. m.) mixed with 19.5 kg on paving bitumen per 10 square meters of road surface including rolling the surface in complete is generally applied in case of the twelve feet width of the road surface and the medium traffic volume is considered for the surface dressing however the Engineer in charge is responsible to verify the existing quantities of road metal used for the purpose of renewal coat, as per condition verified for the recommendation.