Special repair Replacement to structural repair to RCC Column of SMQ Ph I at AF Ojhar

Amount

Razing off/taking down old existing unserviceable cement plaster, loose/unsound weaken cement concrete of any description and in any position from existing external/internal surfaces of RCC roof/slab/beams/columns/RCC facias, or any surface average depth 25mm (Approx height 15m from natural ground level) with power driven of pneumatic chisel and removal beyond MoD land including cutting of all edges, making square shoulders of the cavities, roughening the smooth surfaces, scrapping out/removing corrosion all loose/surface and applying one coat of styrene butadience polymerized cement mortar modified Ensuring no porosity in new surface. Make; Thermax/chemco system/webac chemicals/STP. This items shall be executed before item No-5 and 7.

M&L for drilling hole in RCC/Bricks structures using drilling machine up to a depth of 50 mm and 15mm dia, with the gap of 600mm removing dust, etc by vacum cleaner and blowers, providing and fixing of heavy grade GI pipe nipple 15 mm dia, 50 mm long @ 1.0 mtr c/c in both direction and injection cement slurry mixed with liquid integral waterproofing additive 1000L for concrete conforing to EN 934-2 T9 confirms to IS 2645-2003 Make of Thermax/chemco system/webac chemicals/STP having specifiec gravity 1.1-1.2 gms/cc, in combinatioon with expanding powered or dual shrinkage compensating non shrink free flow plasticized grouts conforming to the requirements of BS EN 1504-3 class R4 Complete all as specified and directed by Engr in charge.

M&L for providing and applying passivating protective matrix conforming to EN 1504-7-2006 on corroded visible steel forming a continuous film not less than 1 mm of single component. Make of Thermax/chemco system/webac chemicals/STP and preparing the surface to receive the epoxy grout mortor including providing necessary proportions. Bracing and runners to relieve the members as required and as per design and pattern including preparing the surface to match with the existing surface. Complete all as specified and directed by Engr-in-charge.

On dilapidated girders or reinforcement encased in concrete M & L for providing and applying of alkaline based Anti oxidizing compound for steel structure conforming to ASTM D 1748-10(2015) after cleaning to loose scale or oxidized chips from bars. Having specific gravity 1.2 - 1.22 . Make of - Thermax/chemco system/webac chemicals/STP the material to be applied to the rusted metal using brush, allow it to react for 16 to 324 hrs and afterwards wire brushing the surface. Clean with dry cloth before application of protective coating etc.Complete all as specified and directed by Engr-in-charge.

M & L for providing 25 mm thick one component chloride free thixotropic fibre reinforced polymer modified repair mortor 5F complies with ASTM C 109 with flexural strength ASTM C 348 @ 7 days meeting 7N/mm2 and tensile strength @ 7days(ASTM C 307)> 3 N/mm2 at the outer or inner RCC surface mixed with 30 Kg cement mortar in the ratio 1:1 (BS5F 30Kg mix with 30 Kg cement mortar of ratio 1:4) and mixted with styrene butydiene polymerized cement mortar modifier of AR for bonding with cementious mortor specially adhered to BS 6319 having specific gravity of 1.025 to 1.04, minimum 43% solid contents) not less than 2% by weight of cement and as per manufacures, s instructions. for external or internal surface of RCC / slab / beam/columns/facias/any brick or stone wall surface etc. Make of Thermax/chemco system/webac chemicals/STP top surfaces of the plaster shall be finished even and smooth with suing extra cement complete all as specified and as directed.

M & L for drilling hole chemical anchoring of reinforcement on existing column/beam/chajja/wall/ beams with Hilti HIT-HY70 or equivalent in thermax. Make-Thermax/chemco system/webac chemicals/STP, maximum hole depth 100mm, steel bar 12mm dia and drill bit size 14mm with polyster resin based anchoring materail for H/V/Large annular applications or post installed bars or in accordance with bar thickness. Complete all as specified and directed by Engr-in-charge.

M & L for providing and apllying Rheoplastic non shrink corrosion resistant, High strength compound BS66 on external or internal surface of RCC roof/floors/ceilings/chhazas/ slab/balconies/beam/ columns/facias/any brick or stone inner or outer wall surface etc, BS 66 having compressive strength as Bs 4551-80 thickness of 40-50mm with 1:4 cement mortor (mixed wtih 30 Kg cement mortar in the ratio 1:1 (BS66 30 Kg mix with 30Kg cement mortar of ratio 1:1 and strength (ASTM C 109)-80 Mpa@ 28 days,Tensile strength 2.0N/mm2 @ 28 days (ASTM C 348)- 4Mpa @ 28 days, Young's modulus -27 KN/sqmm(ASTM D469), Expansion charactristics(ASTM c 827-1987) Unrestrained expansion upto 4% pressure to restrain plastic Expansion -Approx. 0.004 N/spmm make of Thermax/chemco system/webac chemicals/STP, before pouring micro concrete it is recommended to apply granolithic E-Resin based solvent free concrete bonding agent/EP in accurate proportion with complete homogenesity. make of Thermax/ Chemco system /Webac Chemicals having mix density of 1.45 to 1.5 kg/litre, Compressive strenth(BS 6319 pt.2)-40 Mpa at 7 days, Flextural strength (BS 6319 pt.3)-25 Mpa at 7 days, Tensile strength(BS 6319 pt .7)-15Mpa at 7 days, Bond strength(ASTM C 881)-11 N/sqmm at 7 days, having an over lay time of 03 hrs at 30 C. pouring of micro concrete using suitable arrangement as required using pumping device for uniform flow of micro concrete. The side shuttering can be removed after 3 dyas, and the bottom shuttering after 7 days, ensuring proper bond between the micro concrete and existing concrete substrate etc. complete including all tools and tackles as directed by Engr-in-charge.

M & L for applying two coats of single component cementious water proofing membrane for holding the quality of negative hydrostatic pressure on new micro concrete/prepared surface(for item No.5 & 7or as required) also meeting the elasticity modules as follows 28 days 14000-16000 N/mm2 adhesion to substrate 1 day 0.6N/mm2 28 days 1.3 N mm2 compressive strength 1 day 12N/mm2 28 days 36N/mm2 flexural strenth 1 day 3.6N/mm2 28 days 8.2N/mm2, modified with special additives and ready to use. Make : Thermax/chemco system/webac chemicals/STP. Mixed with water it cures forming a coating, with limited thickness which resists thepenetration of water to achieve compressive strength of 36 N/mm2 in 3days, adhesion bond strength of 8.2 N/mm2. coating to be applied after proper surface preparation to remove loose dust, dirt etc. Cleaning mixing using slow speed electric drill . Complete as per specification.

M & L providing and filling three components compound(A) graded filler (B) E-Resins © thixotropic agents with adjustable consistancy by varying the filler component. Make of- Thermax/chemco system/webac chemicals/STP having the density of 1.64 - 1.68 gm/cc.. for RCC/column/beam cracks and similar work after opening up in "V" groove manner covering the area of 300mm from central line of crack with the depth of 50mm. Complete all as specified and directed by Engr-in-charge.

M & L for repair to cracks and damaged existing surface of RCC roofs, slabs, RCC chhajjas and similar work up to 15mtrs height from normal ground level by structural strengthening with application of expanding powered or dual shrinkage compensating non shrink free flow plasticized grout. Make of Thermax/chemco system/webac chemicals/STP as directed by GE. Complete all as specified and directed by Engr-in-charge.

M & L for curing of the surface using wax based concrete curing compound curing efficiency; Make of Thermax/chemco system/ webac chemicals/STP complies with the internatinally recognised ASTM C309-90 standards including all tools and tackles.Complete all as specified and directed by Engr-in-charge. Note- this item shall be undertaken by the authorised rep of manufacturer. Note- Sl item no-1 to 11 shall be undertaken by the authorised rep of manufacturer.

m/s vikash Engineers

Rama constructions

Neeraj construction company