RECASTING/REPAIR TO CONCRETE SLABS OF DISPERSAL AREA AT AF STN SONEGAON

Demolition of cement concrete (unreinforced) of any description exceeding 15cm thickness as in floor/pavings/hardstanding/PQC and in any position as in dispersal runway/taxi track wout disturbing the adjacent side by cutting with mechnically operated diamod cutter or any other source and removing the rubbish outside defence land complete all as specified and directed

Providing and Laying Dry lean Concrete (DLC) 150 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 cemen 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 usign high amplitude tamping bars o 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 tolerances to be as per Table 900-1 of MaRTH specifications fa Road and Bridge work 2013 complete all as specified and directed.

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

S&F for 400 micron thick HDPE sheet (Virgin Quality) water proof, wrinkle free with 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.

M&L for 250 mm thick pavement quality control concrete (PQC) with minimum flexural strength of 45 kg/cm sqr Lower control limit (LCL) at 28 days pavement slab using minimum 400 kg of cement per cum as per IRO-44 (Only 43 grade of OPC in PQC) mixed with non circular synthetic fibre (as per specification given by E-in-C Branch)(paid separatyely) by mechanical means at rate of 0.25% by weight of cement per cum of PQC. The maximum size of aggregate in PQC must be 31.50 mm and gradation as per IRC-44, 2017 laid , spread and compacted with slip form paver. Curing and tining by mechanical equipment etc complete all as specified and directed by Eng-in-charge

Supply only polyester triangular fibres as secondary reinforcement in all types of concrete and mortars all as specified and directed.

M&L for finishing surface of concrete roads, pavements by belting and then by brooming when the concrete is green complete all as specified.

M&L for forming 25 mm width expansion joint in concrete slab for full depth of POC. Early entry saw and subsequent cutting by using diamond bit cutter o appropriate size. straight and smooth edges. Join cleaned thoroughly with application of compressed air. Joint shall be made dry, vacuum cleaned and free of dirt, oil, vegetation and other debris. The join then filled with pre-molded 25 mm thick compressible polyethylene closed cell type filler board as specified thereafter application of two coats of primer with thin brush by forward and backward movement at an interval of 30 minutes before placing the backup rod and pouring the sealant Placing of closed cell medium density, crossed linked polyethylene foam backup rod of 30 mm dia, over filler board and filled with polyurethane based sealant complying with BS5212, BS 4254 and EN-141875-2003 with minimum movement accommodation factor (MAF) of+/- 30% having minimum 10 year performance guarantee applying masked tape on the edges of joints and removing the masking tape after filling of sealant as per the method specified by the manufacture complete as specified and directed.

M&L for cutting of construction joints 25 mm deep and 10 mm wide by early entry saw cut using diamond bi cutter of appropriate size, straight and smooth edges. Joint cleaned thoroughly with application o compressed air. Joint shall be made dry, vacuum cleaned and free of dirt, oil, vegetation and other debris Application of two coats of primer with thin brush by forward and backward movement at an interval of 30 minutes before placing the backup rod and pouring the sealant. Placing of closed cell medium density, crossed linked polyethylene foam backup rod of 12 mm dia, application of bond breake tape on top of back up rod for complete width of the joint and filled with polyurethane based sealan complying with BS-5212, BS 4254 and EN- 141875- 2003 with minimum movement accommodation factor (MAF) of +I- 30% having minimum 10 yea performance guarantee, applying masked tape on the edges of joints and removing the masking tape after filling of sealant as per the method specified by the manufacturer complete as specified and directed

M&L for forming dummy/ contraction joint with an initial saw cut of 3mm soon after the concrete has set, upto a depth of 1/3rd to 1 /41th the thickness of the slab widening the first saw cut to 6 mm and 24 mm deep by using diamond bit cutter of appropriate size straight and smooth edges Joint cleaned thoroughly with application of compressed air. Joint shall be made dry, vacuum cleaned and free of dirt, oil vegetation and other debris. Application of two coats of primer with thin brush by forward and backward movement at an interval of 30 minutes before placing the backup rod and pouring the sealant. Placing of closed cell, medium density, crossed linked polyethylene foam backup rod of 8 mm dia application of bond breaker tape on top of back up rod for complete width of the joint and filled with polyurethane based sealant complying with BS5212 , BS 4254 and EN-141875-2003 with minimum movement accommodation factor (MAF) OF +/- 30% having minimum 10 year performance guarantee applying masked tape on the edges of joints and removing the masking tape after filling of sealant as per the method specified by the manufacturer complete as specified and directed.