thrissur crpn 2019-20 p . no . 251/20 retarring of kanjani road and byelanes , thekke pullazhi road , pullazhi 3 cent colony road , various roads etc in dn . 46 , retarring , 75 . 5 . 5 . b . 2pb : modified penetration macadam 75 mm thick using bitumen s-65 - packed bitumen rates
construction of penetration macadam over prepared base by providing a layer of compacted crushed coarse aggregate using chips spreader with alternate applications of bituminous binder and key aggregates and rolling with a three wheel 80-100 kn static roller to achieve the desired degree of compaction as per technical specification clause 506 . , 75 . 5 . 2 . 1pb : tack coat - with packed bitumen rates
providing and applying tack coat with bitumen emulsion ( rs-1 ) using emulsion distributor at the rate of 0 . 20 to 0 . 25 kg per sqm on the prepared bituminous surface cleaned with hydraulic broom as per technical specification clause 503 . , 75 . 5 . 9 . 1 . 2pb : 20mm thick open-graded premix carpet using bituminous ( penetration grade/modified bitumen ) binder - bitumen s-65 - packed bitumen rates
providing , laying and rolling of open-graded premix carpet of 20 mm thickness composed of 13 . 2 mm to 5 . 6 mm aggregates either using penetration grade bitumen or emulsion to required line , grade and level to serve as wearing course on a previously prepared base , including mixing in a suitable plant , laying and rolling with a three wheel 80-100 kn static roller capacity , finished to required level and grades to be followed by seal coat of either type a or type b or type c as per technical specification clause 508 .
case - i by manual means
( ii ) bitumen ( s-65 ) , 75 . 5 . 12 . a . 3 . 2pb : seal coat - manual means - type c - bitumen s-65 - packed bitumen rates
providing and laying seal coat sealing the voids in a bituminous surface laid to the specified levels , grade and cross fall using type a , type b and type c as per technical specification clause 510
a . by manual means
case iii : type c
( ii ) bitumen ( s-65 )