ROUTINE MAINTENANCE OF CIVIL WORKS AT SLIPWAY DEGAUSSING BAY AND VLM JETTY AT NAVAL DOCKYARD VISAKHAPATNAM UNDER GE (I) DM VISAKHAPATNAM

M&L for chipping & removal of existing damaged, cracked, spalled & loose portion of concrete of the RCC members completely till the reinforcement is exposed and sound concrete (20mm to 50mm) is observed by using mechanical means and manual chisels and further the surface is jetted with clean water for removal of dust and loose particles and complete all as specified and directed.

M&L for providing shear connectors and anchoring : Drilling 12mm dia holes upto depth of 100mm and fix 10mm dia TMT bars L shaped anchor rods as shear connectors in defective concrete area of the slab, column, beams etc. or any other structural member as the case may be. Clean the same using water and make sure that there is no fine particle present in the hole. Mix the base and hardener of the polyester resin Fosroc Lokfix or techno commercially equivalent or make as approved by GE with the spatula thoroughly. Fill the drilled and cleaned holes to a minimum depth of 3/4th of the hole with the prepared polyester resin and the reinforced bar shall be inserted to full depth of hole and extra length of the reinforcement bar shall be bent into the concrete to maintain proper cover to the reinforcement complete all as specified and directed.

M&L for preparation of exposed surafces of rusted steel reinforcement of dia 10mm and above with metal wire brush, cleaning the rusted surfaces free from loose rust and application of rust remover cum passivator painted with brush to the rusted reinforcemnet @ 2.0-2.5Ltr /Sqm surface of steel reinforcement, (Fosroc-Reebaklens RR or make approved by GE) to the surface of existing reinforcement) and removing rust with flex after 24 hours of application of rust remover with the help of wire brush, sand paper and throughly washed with water with the help of pressure jet and allowing it to dry complete all as specified and directed. (Length of reinforcement steel bar shall be measured for payment complete)

S&F welded steel wire fabric, fixed to RCC wall/ceiling with necessary fixing arrangement weight exc 2 kg/sqm butt not exc 4 Kg/Sqm complete all as specified and directed.

M&L for aplying a coat of poymer modified cementious bonding coat on the concrete surface with one coat of styrene butadiene rubber latex emulsion (SBR latex) manufactured by M/s Fosroc chemical or equivalent chemical manufactured by Sika india india pvt Ltd/ Choksey chemicalpvt Ltd/ M/s STP/ M/s Dr Sunanada with four parts of water and six parts of cement by weight coverage of SBR latex 0.25Ltr/sqm for one coat complete all as specified and directed.

M&L for 40mm thick guniting by chemical mortar prepared by Rendroc DS 40 manufactured by Fosroc (25kg rendroc DS40 mixed wit 12.5kg of 6mm downgraded crushed stone aggregate) or equivalent cheical manufactured by Sika india pvt Ltd/ Choksey chemical pvt Ltd/ M/s STP/ M/s Dr Sunanada on prepared concrete surfaces complete all as specified and directed.

M&L for 20mm thick guniting by chemical mortar prepared by Rendroc DS 40 manufactured by Fosroc (25kg rendroc DS40 mixed wit 12.5kg of 6mm downgraded crushed stone aggregate) or equivalent cheical manufactured by Sika india pvt Ltd/ Choksey chemical pvt Ltd/ M/s STP/ M/s Dr Sunanada on prepared concrete surfaces complete all as specified and directed.

M&L for application of polymer modified reinstatement mortar 20mm thick in isolated places of repair works of RCC members with Rendroc S2 of M/s Fosroc make or make approved by GE having a compressive strength of M40 grade complete all as specified and directed.

M&L for laying cement based Micro-concrete, Rendroc RG 40 of Fosroc make or make as approved by GE, pre-packed single component, chloride free, sulphate free, non-shrink, free flow, self compacting, ready to use after mixing water in specified proportion of approved quality. Formwork shall be provided for placing micro concrete patch repair as required at site with steel jack system and steel props to support the form work in this application of high strength, dual shrinkage, compensated, micro concrete for placing in nominal thickness of more than 50mm for concrete repair with compresive strength of 40 Mpa at 28 days complete Note: The qouted rate deemed to be included for formwork / shuttering, if any required.

M&L for two coat of exterior emulsion antifungal paint over a coat of primer on new/old surfaces of ceiling and wall of new / old surface of gallaries including surface preparation complete