REPAIR AND RESURFACING OF EXISTING ROAD AT DOMESTIC AREA AT AIR FORCE STATION BARRACKPORE UNDER GE (AF) BARRACKPORE

Scarifying or picking gravelled, macadam or bituminous macadam surfaces in area not exceeding 400 sqm, depth of pot hole not exceeding 50mm including rolling over the broken surfaces using 8 to 12 tonnes power roller to required camber and gradient complete all as specified and directed.

Material and labour for applying evenly a tack coat of Cationic Bitumen Emulsion (RS-1) conforming to IS: 8887 at a rate of application of 0.3-0.35 kg/sqm on cement concrete pavement/ black top surfaces as specified in Table 500-5 of MORTH specification for road and bridge works 2013, using mechanical sprayer complete all as specified and directed.

Material and labour for premix bituminous macadam not exceeding 75 mm thick (consolidated thickness) using hot mix plant and mechanical paver with 4% binder (Paving grade bitumen VG-30) content by weight of total mix, laid, rolled and compacted with power roller of 8 to 12 tonnes to required gradient and camber complete all as specified and directed. Note:- The exact bitumen content required shall be as determined as per IRC 27:2009.

Material and labour for repairs to pot holes of depth exc 30 mm and area not exc 1 sqm each including sweeping free from dust and mud or water scoring sunken surfaces on roads path etc cutting around edges at least 30mm depth, making good by applying tack coat with paving bitumen @ 5 kg per 10 sqm, putting in premixed bituminous macadam well rammed and sealed with binder of paving bitumen @ 9.8 Kgs per 10 sqm, blinded with 0.09 cum of stone chippings 6.3mm size & again well rammed (including supply of premixed macadam binder VG-30 & chippings) and rolled with using 8 to 12 tonnes power roller to required camber and gradient complete all as specified and directed.

Preparing existing black top surfaces by brushing with wire brushes for removing caked mud etc. sweeping with brooms and finally fanning the cleaned surface with gunny bags to remove all loose dirt etc complete all as specified and directed.

Material and labour for applying evenly a tack coat of Cationic Bitumen Emulsion (RS-1) conforming to IS: 8887 at a rate of application of 0.2-0.3 kg/sqm on bituminous surface as specified in Table 500-5 of MORTH specification for road and bridge works 2013, using mechanical sprayer after cleaning of existing surface as specified and directed.

Material and labour for bituminous premixed semi-dense asphaltic concrete 30 mm consolidated thickness with 5.5% binder (paving bitumen of grade VG-30) content by weight of total mix, spread evenly to desired thickness and to the correct camber, rolled and compacted to required gradient and camber with power 8 to 12 tonnes roller/ vibrator roller/ double drum or tandem roller as suitable complete all as specified and directed. Note:- (a) Exact quantity of binder to be used and shall be ascertained by design mix. (b) The binder content in the mix shall be minimum 5.5% by weight of total mix. However, in case more than 5.5% of binder content is required as per design mix, the same shall be provided by the contractor at no extra cost to the department. (c) Binder content and density testing equipment should be readily available at site for field tests. (d) The exact bitumen content required shall be determined by the Marshall mix design procedure contained in the Asphalt Institute Manual MS-2 (Sixth Edition) as referred in clause 3.5.3 of IRC 111:2009. (e) Rate deemed to be included for making good of any undulations/ damages in wearing surfaces where SDAC is done.

Material and labour for 25mm thick bitumen mastic road consisting of an intimate homogenous mixture of material filler, well graded fine and course aggregate with VG-40 grade bitumen in the range of 14 to 17 percenatage of total mix as per IS : 73:2006 or suitable grade confirming to IS : 702 1988 mixed and cooked at 170 C to 210 C in an approved type mechaniaclly agitated mastic cooker laid in temp between 175 C to 210 C spread uniformily by hand using wooden trowel and floats laid over tack coat of VG 40 grade bitumen confirming to IS : 73:2006 @ 5 Kg/10Sqm over prepared base all as per para 20.A .30 of SSR part-l 2009 and IRC : 107-1992. During mixing and cooking care shall be taken to ensure that contents in the cooker are at no time heated to a temparature excedding 210 C bitumen mastic after spreading and while still hot and in plastic condition shall be spread over with bitumen precoated fine grained hard stonechips/coarse aggregates of approved quality of 2.36 mm to 13.2mm size, fine aggregate 0.075mm to 2.36mm size and filler shall be limestone powder content of not less than 80 percentage by weight determined in accordence with IS : 1514 and pressed into the surface when the temperature of bitumen mastic in between 80 C and 100 C such precoated aggreagtes when laid should protrude 3mm to 4mm over the mastic surface of approved quality of 9.5mm to 13.20mm size @ 0.005m/10 Sqm and roller complete all as specified and directed.

Material and labour for preparing bituminous surfaces of road and making 2.5mm thick centre lines, stop lines, dashes, arrows etc. and the like n. exc 10cm wide on roads pavements with hot applied thermoplastic road marking paint of approved colour confirming to BS 3262-1989 with special applicator machine all as per manufacturers instruction complete all as specified and directed.