Roof Terrace Waterproofing work with 2 components PU Waterproofing system at Basic Science Building at Assam Medical College and Hospital, Dibrugarh

Amount

(For Screed) 15.2 Demolishing cement concrete manually/ by mechanical means including disposal of material within 50 metres lead as per direction of Engineer - in - charge. 15.2.1 Nominal concrete 1:3:6 or richer mix (i/c equivalent design mix) cum

Protection screed for Horizontal Area: 4.2 Providing and laying cement concrete in retaining walls, return walls, walls (any thickness) including attached pilasters, columns, piers, abutments, pillars, posts, struts, buttresses, string or lacing courses, parapets, coping, bed blocks, anchor blocks, plain window sills, fillets, sunken floor etc., up to floor five level, excluding the cost of centering, shuttering and finishing: 4.2.2 1:1½:3 (1 cement : 1½ coarse sand (zone-III) derived from natural sources : 3 graded stone aggregate 20 mm nominal size derived from natural sources)

13.2 15 mm cement plaster on the rough side of single or half brick wall of mix : 13.2.1 1:4 (1 cement: 4 fine sand) sqm 339.70 (For Paraphet Wall)

14.72 Providing and fixing double scaffolding system (cup lock type) on the exterior side, up to seven story height made with 40 mm dia M.S. tube 1.5 m centre to centre, horizontal & vertical tubes joining with cup & lock system with M.S. tubes, M.S. tube challies, M.S. clamps and M.S. staircase system in the scaffolding for working platform etc. and maintaining it in a serviceable condition for the required duration as approved and removing it there after .The scaffolding system shall be stiffened with bracings, runners, connection with the building etc wherever required for inspection of work at required locations with essential safety features for the workmen etc. complete as per directions and approval of Engineerin-charge .The elevational area of the scaffolding shall be measured for payment purpose .The payment will be made once irrespective of duration of scaffolding. sqm 285.00 Note: - This item to be used for maintenance work judicially, necessary deduction for scaffolding in the existing item to be done

Surface Preparation: Clean all concrete surfaces free of laitance, dust, dirt, cavities, projecting nibs etc.by grinder and wire brush. Grease should be cleaned using a chemical degreaser and washed with clean water and allowed to dry. Remove all protrusions from concrete surfaces using a fine hair broom finish. Remove moss and lichen manually and treat the surface with a fungicide. Wash the surface thoroughly with clean water and allow it to dry. Standing water must be removed to prevent subsequent compromise of waterproof properties. Surface should be absolutely dry before application of Sikalastic M862. The surface should be grinded to remove contaminants, laitance and weak concrete, so as to have a sound concrete surface with adequate profile.

Crack Repair: Make 25mmx25mm “V” shape groove cutting at all visible cracks. Supply and apply of High Grade Dual Shrinkage Compensated Pre Packed Cement Based Repair Mortar such as SikaEmaco S 348 of MBS / MonoTop 122 F of Sika / equivalent, using SIkaEmaco SBR 3 of MBS SIKA make as bonding agent

Rebuilding the damaged patches & damaged Padestal columns using structural grade Repair mortar : Supply & application of Ready to use, dual-shrinkage compensated, cementations, fibre reinforced high performance repair mortar, mixed with water at a w/p ratio of 0.14 using suitable methods. Use Suitable bonding agent such as SikaEmaco SBR 3 of MBS SIKA make for proper bonding of old to new concrete Material: SikaEmaco S 348 of MBS / MonoTop 122 F of Sika

Sealing of Rainwater pipes: Providing and filling the pipe inlets/outlets at the periphery of the pipes with high strength repair mortar such as SikaEmaco S 348 of MBS / MonoTop 122 F of Sika / equivalent after application of bonding agent such as SikaEmaco SBR 3 of MBS SIKA make

Epoxy Grouting: Drilling Holes - Drilling holes in structural members at the intervals as per recommendation of engineer in charge. Cleaning of holes - Clean the holes by air blower prior to fixing nozzles. Fixing of NRV Packers: Insert 12 mm dia., 50~75 mm long injection packers in cleaned holes with epoxy resin based putty or quick setting mortar. Cutting of Packers: Cut the packers by cut of wheel after completion of grouting without damaging structural elements. Grouting - Provide grouting after fixing the injection ports at predetermine locations with the help of suitable injection grouting pumps at suitable pressures using two-component, high strength, low viscous (<350 cps @ ambient temperatures) epoxy injection resin system having minimum pot life of 30 minutes at ambient temperatures, achieves compressive strength higher than 55 MPa at 1 day & 65 MPa at 7 days; Flexural strength higher than 55 MPa at 7 days; slant shear bond strength higher than 15 MPa in 7 days such as SikaInject 471 of SIkA make

Prepare Coving at required joints with fillet of size 150mm x 150mm with CM 1: 3 admixed with as SikaEmaco SBR 3 of MBS SIKA make. The product shall have minimum butadiene content of 37% by weight. The polymer shall be capable of being used as bonding agent and shall have pull-off bond strength not less than 1 MPa

Waterproofing layer: Priming: Ensure 28 days Old Concrete & intrinsic moisture of concrete should be up to 4-5%. Apply SikaFloor P 2525, a two component, 100% solids, solvent free epoxy primer for use with various Sikalastic® liquid applied membranes over the mother concrete in 200-250g/sq.m Subsequent coats can be applied after 4 hours when primer is touch dry or as per site condition not less than 48 hrs. Pour the mixed primer material onto the prepared substrate and apply by trowel or squeegee. Ensure a continuous, pore free coat covers the substrate. If necessary, apply two coats. Waterproofing Membrane -Providing and applying solvent free , >98% solids, Two component, hand applied, PU waterproofing using Sikalastic M 862 of MBS Sika at 1.5mm total average DFT to be applied at minimum consumption of min 1.8-2.0 kg per sqm incl. wastage as per approved manufactures specifications. - Tensile strength in Range of 6-8 Mpa as per ASTM D 412 - Elongation > 600% ASTM D 412 - Tear > 30N/mm as per ASTM D 624 - Shore A Hardness 75+-5 as per ASTM D 2240 - Crack bridging 3.2mm as per ASTM C 836

Separation layer Providing 120GSM geotextile to protect the membrane coating getting damaged while installation of screed concrete

ABHIJIT SONOWAL (BID ID -269284)