UPGRADATION AND AUGMENTATION OF DUNCAN AND BOMBAY DOCK AT ND (MBI)

Demolition of brickwork or stone/boulder masonary, built in cement mortar or cement lime mortar including all quoins,arches,pillars etc but excluding ashlar facings.dressed stonework and precast concrete articles (Add for portions ordered to be dismanteled).

M&L walling of squared rubble,uncoursed,well bonded and solidly hearted built in cement mortar 1:4 and all as specified and directed.

CLEANING VERTICAL WALLS: M&L for Cleaning of the Entire Vertical surface with the help of Hydro jetting pressure water jet and scrubbed thoroughly with steel wire brush to remove any foreign deposit dust ,dirt and vegetation any other material either manually or mechanically including supply of all tools and plants etc required with saftey mechanism complete in all respect and all as per direction of Engineer-in-Charge.

CHISELING OF MASONARY JOINTS: M&Lfor Chiseling all the joints in the masonary upto a depth of 25mm deep forming grooves removing all lose and foreign matters without using any mechanical heavy equipment manually including supply of all tools ,plants etc required with saftey mechanism complete in all respect. (Vertical surface only)

M&L for inserting injection nipple at 600mm spacing along all the joints and fixing with suitable mortars to facilitates injection of suitable grouts to strengthen the mortar. The nipples should be 12 mm diameter made of galvanized steel. For this purpose, 15-30 mm dia holes should be drilled upto a depth of 100 mm at spacing of 600mm c/c along the joints. Two consecutive rows should be drilled in zig-zag manner as per the architecture drawings. The holes should be made dust free as far as possible by blowing compressed air. Then the nipples should be sealed with proper chemical mixed mortarand allow it to cure complete as per direction of Engineer-In-Charge.

M&L for injecting Expanding type grout admixtures or other approved grout in proportion recommended by manufacturer in the previously installed nozzle of dia 12 mm by suitable gun /pump at required pressure including cutting of nipples after curing,the injection should be done under pressure and continued until the grout or slurry begins to flow out from the adjacent nipples all complete as per direction of Engineer-in-charge. ( Injecting expanding grout admixture SikaCem-130 Intraplast or equivalent @ 0.4% by weight of cement in proportion recommended by the manufacturer into cracks/damaged/ eroded/honey-comb area of masonry surface by suitable gun/pump at required pressure including cutting of nipples after curing etc. complete as per directions of Engineer-in-Charge.The proportion shall be as per manufacturer specification)

M&L for Filling/Packing all the groves/cleaned joints should be treated with Ironite Cementitious Structural Repair and Pointing Mortar, which has a compressive strength greater than 25N/mm² after 1 day and more than 60N/mm² after 28 days with appropriate epoxy based mortar. The proportion shall be as per manufacturer specification and curing shall be done as per recommendation all complete as per direction of Engineer-in-charge. (Poly ironite ceramic cementitious structural repair and pointing mortar Sika MonoTop®-3220 PIC Mortar or equivalent for repair of masonry structures having minimum Compressive Strength of >25 Mpa (1 day) & >60 Mpa (28 days) at 30°C; Tensile adhesion strength ≥ 1.5 MPa (28 d, +30 °C) (EN 1542); Bond Strength >10 MPa (28 d, +30 °C) (ASTM C882).The proportion shall be as per manufacturer specification)

M&L for vertical channels of minimum 125mm wide x125mm deep at leakage points to dispose seepage water into the proposed drain channel on floor. The channel shall be made by cheiselling the existing wall and finishing alongwith the construction of vertical RCC wall as per design drawing. The outlet of the leakage points shall be made smooth with insertion of SS SUPER DULUX(SS 32760/F55) pipe of minimum 100mm dia. This should be ensured that the water oozing should not be stopped with pouring of concrete. Make:- Sika, Fosroc.

ULTRA HIGH STRENGTH PATCH REPAIR M&L for fixing Ultra High Strength Patch Repair mortar on Damage stone surfaces after neatly cleaning the surface and then mortar are applied on the surface making smooth with the help of trowel to give finished similar to stone the 28 days equivalent compressive strength of the patch mortar should not be less than 70 N/mm2 . Forming groove of uniform size and match the texture using natural stone texture paint to give authentic effects of natural stones in the top layer of plaster as per the previous pattern of stone masonry wall using all suitable equipments and finishing the groove complete. (Patch repair mortar SikaEmaco S 488 or equivalent having compressive strength >= 70 N/mm2 (28 days) according to ASTM C 109; Flexural Strength : >9 Mpa in 28 Days (ASTM C348); Tensile Strength : > 4Mpa in 28days (ASTM C 496); Modulus of Elasticity : >15,000 MPa ( EN 13412); Water Penetration <5mm (DIN 1048); Carbonation Test : Absent (EN 13295). The product can be built 50 mm layer thickness at once) Make:- Sika, Fosroc, Krishna, Conchem.