Building Repair & Renovation Tenders

8 STRUCTURAL REPAIRS WORKS WITH PRE-PACKED DUAL SHRINKAGE CONTROLLED (volume stable in wet & hardened state), single-component ready-to-use, structural grade high build, alkali-resistant, fibre reinforced, thixotropic polymer modified repair mortar having excellent bond strength to old damaged concrete structures / surfaces by the following process: 1) Removal of loose/spalled or damaged concrete by chipping and cleaning the concrete surface to open up to 20mm behind the reinforcement steel with wire brush and with clean water including removal of dirt, paint, wax, oil, grease, laitance, foreign substances, etc. Mechanically profile and prepare concrete surfaces by abrasive blasting, water jetting or other engineer approved methods. 2) Cleaning the rebars with Acetone for complete rust removal and washing with water to make the surface clean. Ensure that the concrete substrate and ambient temperatures are between (10°C and 35°C) before application. 3) Applying protective coat / bond coat using Styrene Butadiene Rubber (SBR) polymer and cement in the proportion of 1: 1 (1 part of polymer : 1 parts of cement). 4) Mixing full 25 Kg bag with clean potable water in water to product ratio of 0.12 to 0.18), mixed by heavy-duty slow speed (300 to 600 rpm) drill with spiral mixing paddle or forced action pan mixer pan for 3 minutes to achieve uniform lump free mortar consistency. 5) Applying polymer modified mortar with trowel & float. The polymer modified mortar shall have the following properties/technical parameters: (A) Properties / technical parameters of pre-packed Polymer Modified Mortar: i) Compressive strength 1 day: Min. 20 MPa (as per BS:6319 : Part 2) ii) Compressive strength 7 days: Min. 35 MPa (as per BS:6319 : Part 2) iii) Compressive strength 28 days: Min. 45 MPa (as per BS:6319 : Part 2) iv) Flexural strength in 28 days: Min. 7 Mpa (as per BS:6319 : Part 3) v) Tensile strength in 28 days: Min. 2.5 MPa (as per BS:6319 : Part 7) vi) Bond strength: Min. 5 MPa (as per ASTM : C881) vii) Water permeability: less than 1% (as per ASTM : C881) viii) Drying shrinkage in 28 days: less than 1000 microstrain (as per ASTM C 157-93) ix) Potential Alkali Reactivity - : 0.1% Expansion % (ASTM C1260) (B) Properties / technical parameters of SBR polymer bond coat material: i) Meets the requirements of BS 6319 part 2:1983 & ASTM C 190-85 standards ii) Total solids % by mass at 105°C: 38 + 1 iii) pH value: 7.5 to 9.5 iv) Specific gravity at 27.5°C: 1 to 1.05 v) Coverage: 4.2 - 4.5 sq.m/kg per coat. Notes:- (a)Placing and finishing the same with trowel / hand packing carefully compacting the same around the rebars and finishing to bring it in line with existing concrete surface on the beams, slabs, columns, etc. (b) If thickness of repair exceeds 20mm , after every 20 mm thick repair, bond coat as per process no. (3) mentioned above in the BOQ item, to be applied and further thickness of repair to be continued for each layer. (c) The surface preparation & method of application shall be as per manufacturer's technical data sheet. (d) The double tubular steel scaffolding will be paid separately in relevant item. (e) Sampling and testing of cube specimen for compressive strength test shall be as per BS 6319 - Part-2.Other tests mentioned above shall be carried out if required as per the direction of the EIC and the cost of which shall be deemed to be included in the quoted rate (f) For each batch of mortar mixed, following records, i.e Quantity of mortar (kg) mixed, Amount of water added to the mix, Location of application and the area covered.(g) Payment will be paid on the basis of actual consumption of PMM & Reinforcement will be paid in the relevant item. (h) Safety Precuations:- Use wear tight-fitting, dust-resistant, chemical splash goggles and dust respirator, if airborne dust is generated, wear protective rubber hand gloves, wear appropriate clothing to prevent any possibility of skin contact. The above item of work is inclusive of all materials, labour, machinery, tools & tackels, consumables, trasportation, loading & unloading, safety PPEs etc. all complete as directed by Engineer-in charge at site using approved pre-packed polymer modified mortar suitable for structural repair works. 21500 Kg Excess(+) Full Conversion INR

Annual repair work of Govt. Residential Building Under Sub Division Rajgarh (2nd Call)

Repair to plaster in patcches of area 2.5 sq. meter and under including cutting the patch in proper shape, raking out joints and preparing and plastering the surface of the walls with cement mortar 1:4 (1 Cement : 4 fine sand ) complete including disposal of rubbish to the dumping ground within 50 meters lead: