SPL REPAIR OF TWO BLOCK P-123 AND P-124 AT VASANT RANGE COLONY UNDER GE SOUTH DELHI CANTT

M&L for Preventive treatment against the danger of carbonation in exposed faces of RCC members :- (i) Cleaning existing surfaces of RCC members and making surface free of loose material, oil, grease etc. by vigorous wire brushing including light grit blasting where necessary as recommended by Engr-in-charge. (ii) Further, cleaning using biocide(as recommended by manufacturer) to ensure that surface is free of algae and fungus and no trace of paint (any type) left out. Sand blasting to be done to remove trace of paint. (iii) Cleaned surface to be allowed to dry. (iv) Spray a coat of primer (as recommended by manufacturer) over dry cleaned surface as required prior to final finish. Primer shall be diluted in proposition 2:1 with mineral turpentine. After application, primer shall be allowed to dry for 03 hours or as directed. (v) Apply a coat of neat Aliphatic Acrylic anti-carbonation (ACC) over the primed surface with air / spray gun at nominal rate of 3.5 ltrs per sqm as recommended by manufacturer. (vi) Apply a more coat of Aliphatic Acrylic anti-carbonation (ACC) after 5-6 hours as recommended by manufacturer complete all as specified and directed. (vii) Sprinkle sand cover over surface to receive new.

M&L for followings :- (i) Removing plaster & finishes all around the coloumns, slabs & beams (on all four sidescription of column to full height , three sidescription of beam to entire span & bottom of slab to area as directed) (ii) After cleaning gently removing cover concrete using pneumatic/electric chipper or any other approved tool in entire portion of structural member (removal of cover concrete shall be done to an extent when reinforcement is visible) (iii) Removal of cover concrete with under cutting of up to a depth of 20mm beyond reinforcement around full circumference & full length of bar where directed. (concrete shall be stripped to an extent concrete substrate is exposed) (iv) Cleaning exposed concrete substrate by using water jet. (v) Removing visible rust along the length of reinforcement using hand tools as approved. (The Engr-in-charge may order sand blasting if rust is approved) (vi) Any other work as directed by Engr-in-charge to present clean surface for determination of type of repair to be carried out complete all as specified and directed.

M&L for providing rust proof /anti corrosive treatment to bars :- (i) cleaning of all exposed bars (new & old) alround (ii) Apply a single coat of Alkaline rust converting primer on alround bars new & old as recommended by the manufactuer (iii) Apply two coats of Epoxy phenolic anti corrosive protective coat on bars alround new & old as recommended by the manufactuer. Note : Anti corrosive treatment shall be continuous espcially in the regions where pitting, imperfections, etc were present on the surface of the bars. It is important that the rear portions of re bars (those towards the concrete substrate) should not be left without coating. Superficial area of member to be considered for measurement.

M&L for providing PMM (Polymer modified cementitious mortar) :- (i) Dry sub strate surface and free of debris & dust (ii) Applying Epoxy bond coat on the sound substrate using approved spray machine & ensuring that no pin holes are visible.(In case pin holes are still visible after a coat, a second coat shall be applied to ensure absence of pin holes). (iii) Immediately after application of epoxy bond coat as above apply PMM (Polymer modified cementitious mortar) of 25 mm thickness. Note : Application of PMM shall be preferably be in coats of appx 10mm thickness. PMM work shall be executed in fairely rapid successions so as entire work is completed with in 30 mins). PMM shall be pre packed ready to use. (iv) PMM surface to be moist cured for three days followed by air curing in temperature as recommended by manufactuer complete all as specified and directed.

M&L for Providing & Pouring Micro concreting M-40 grade :- (i) Dry concrete substrate surface and free of debris & dust (ii) Applying Epoxy bond coat on the sound concrete substrate using approved spray machine & ensuring that no pin holes are visible. (In case pin holes are still visible after a coat, a second coat shall be applied to ensure absence of pin holes). (iii) Immediately after application of epoxy bond coat as above pour Micro concreting M40 grade, Make : MasterEmaco S46T of BASF or equivalent FOSROC/SIKA using approved mixing machines/pumping under pressure via approved pneumatic pump at the locations to be repaired in RCC beams & columns etc,. Adding of aggregates will be permitted only as per manufacturer’s recommendation without compromising the strength. The rate shall include cost of all materials (except re-bar) labour charges for mixing, pouring concrete, cost of tools, lead & lift of materials, transportation etc., to carry out the complete work complete all as specified and directed.including M&L for use & waste of form work using steel sheets , steel bracing, propping etc around structural members where micro concreting to be done and keeping form work in position till required specified period complete all as specified and directed. Note : Form work shall be 100% leak proof. For purpose of payment area in touch with concrete shall be measured. Note : The cost of micro concrete M-40 grade & Epoxy bond coat is inclueded in this item.

M & L for Providing and injecting chemical chlorpyrifos emulsifiable concentrate for Post Constructional Anti termite Treatment Along the external wall below concrete or masonry apron using chemical emulsion @ 2.25 litres per linear metre including drilling and plugging holes etc. in apron.

M & L for Anti termite Treatment of soil under existing floors using chemical chlorpyrifos emulsifiable concentrate @ one litre per hole, 300mm apart including drilling and plugging 12mm dia holes with cement mortar 1:2 to match the existing floors all as specified .

S&F for stengthening existing reinforcement by use of mild steel bars of any dia , cut to length, bent to shape required, including cranking, bending spirally and binding with and including mild steel wire (annealed) not less than 0.9mm dia or securing with clips complete all as specified and directed.

M&L for chipping out spilled and loose concrete cover and derusting steel reinforcement of concrete column, beam, slab, chajjas, parapets and the like as directed up to 25 to 35mm thick roughening and cleaning concrete surface with steel wire brushes, washed with water and allowed to dry including derusting steel wire reinforcement, providing fabric MS wire mesh 75 x 75 x 2mm as reinforcement to concrete surface applying adhesive/admixture over steel mesh and providing 25mm average thickness guniting mix using one part of OPC 53 grade and two part of sand mixed with adhesive/admixture @ pressure of 2.5 to 3.00kg/Sqcm by guiniting machine and surface finished even and fair including necessary padding, shuttering/scaffolding, formwork (guniting work to be carried out up to 10 metre height) complete as directed at site Note :- (a) After placing the additional reinforcement all concrete surfaces shall be thoroughly scrubbed with wire brushes, washed with water and allow to dry, apply chemistic polycretes admixture @ 2.25 kg by weight of cement all as per manufacturers instruction. (b) when polymix concreting in taking condition,guiniting is done with polycrete admixture @ 2% by weight of cement all as per manufacturers instructions (polycrete admixture shall be procured from chemical adhesive Pvt Ltd Co or their authorised dealer). (c) Cost of the above aspect shall be deemed to be included in the quoted rate of the respective item and nothing extra shall be paid on any account.

Demolition of RCC of any description, in any position roofs, floors (other than ground floors), beams staircases, landing, chajjas, RCC overhead tank and similar suspended work and Removing excavated material /demolition material exc. 1.50 km but n exc.5 km including taking down from upto four storey and directedcomplete all as specified.