PROVN OF PQC PAVEMENT FOR ONE DE AND FOUR DE TECHNICAL STRUCTURES AND CERTAIN IMPROVEMENTS TO OTHER STRUCTURE AT AF STN JAISALMER

Demolition of plain cement concrete (unreinforced) of any description as in PQC floors and taxi link and removing the rubbish outside MD land etc complete as specified and directed.

Earth work in excavation in all kind of soils by mechanical means (Hydraulic excavator) in over areas (exc. 30 cm, 1.5 m in width as well as 10 sqm on plan and n.exc. 1.5m in depth) including getting out and disposal of excavated earth lead upto 50 m and lift upto 1.5m, complete all as specified and directed.

Earth work in excavation in soft integrated rock by mechanical means (Hydraulic excavator) in over areas (exc. 30 cm, 1.5 m in width as well as 10 sqm on plan and n.exc. 1.5m in depth) including getting out and disposal of excavated earth lead upto 50 m and lift upto 1.5m, complete all as specified and directed.

Rolling and consolidating formation surface in cutting with power roller exc 8 tonne and not exc 15 tonne to achive 98% (density at OMC / modified proctor density) complete all as specified and directed.

M & L for laying and compacting 200 mm thick (compacted thickness) Granular Sub Base Course (GSB) grading as per Grade II as per Table 400-1 of MoRTH specifications for Road and Bridge works, 2013, in two layer of 100mm thick over compacted subgrade with natural sand, crushed gravel, crushed stone, crushed slag, or combination thereof as per the grading required. The materials are mechanically mixed, spread and levelling on the subgrade by using motor grader of adequate capacity, and rolling with vibratory roller of capacity 80-100 KN static weight for achieving required compaction density of atleast 98% of the Maximum Dry Density. Consolidating to required gradient and camber with finished surface tolerances as per Table 900-1 of MoRTH specifications for Road and Bridge works, 2013 complete all as specified and directed.

M & L for laying and compacting 150mm thick (compacted thickness) Wet Mix Macadam (WMM) laid in two layers of 75 mm each, WMM grading as per table 400-13 of MoRTH specifications for Road and Bridge works 2013 manufactured in WMM plant, material comprising of clean, crushed, graded aggregate and granular material premixed with water to a dense mass, spreading with sensor paver and rolling with vibratory roller of capacity 80-100KN static weight and consolidating to required gradient and camber complete all as specified and directed. The finished surface tolerance to be as per Table 900-1 of MoRTH specifications for Road and Bridge works 2013 complete all as specified and directed.

M & L for providing and laying Dry Lean Concrete (DLC) 125 mm thick of aggregate gradation as per Table 1 of SP 49:2014 having 7 day average compressive strength not less than 7 MPa. Minimum cement content not less than 140 Kg/Cum, DLC mixed in Batching Plant, transported to site and laid by electronic sensor paver including spreading and compacting using high amplitude tamping bars of paver (initial compaction) further by double drum smooth wheeled vibratory rollers with 80-100 KN static weight to achieve minimum dry density not less than 98% of maximum Dry Density, necessary finishing etc complete all as specified and tolerance to be as per Table 900-1 of MoRTH specifications for Road and Bridge work 2013 complete all as specified and directed.

M&L for 10-20mm thick sand cushion with clean river sand duly clear of residual, organic an deleterious materials spread evenly to uniform thickness laid over DLC layer complete all as specified and directed.

Supplying and laying 400 micron thick HDPE sheet (Virgin Quality) water proof, wrinkle free without puncture having minimum weight 390 gm/Sqm over tack coat/sand cushion as specified in the design with overlap between adjacent strips and at transverse joints as minimum 300mm complete all as specified and directed. (Note: The area shall be measured net and No additional allowances/amount shall be paid for overlaps)

M & L pavement quality concrete (PQC) of 325 mm and certain portion in variable thickness of minimum 28 days field flexural strength of 45Kg/Sqcm or 4.5Mpa, aggregate gradation as per Table 3 of IRC 15-2017, coarse aggregate of clean, hard strong, dense, non-porous and durable pieces of crushed stone or gravel, fine aggregates of clean natural sand or crushed stone sand or combination of both using minimum 360 kg/cum of cement with non-circular, virgin synthetic fibre of 12-18 mm length specific gravity 1.34 to 1.39, UV stable, alkali resistant, with equivalent dia 15-40 micron, minimum melting temperature as 240°C and minimum tensile strength of 300 Mpa and at the rate as specified by the manufacturer. PQC laid, spread and compacted with slip-form paver of minimum 7.50 m width, including curing and tining by Texturing cum Curing machine complete all as specified and directed.