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NEW MATERIALS AND TECHNOLOGIES USED IN NISM, MUMBAI
DR K M SONI
CHIEF ENGINEER, CPWD, MUMBAI
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NISM PATALGANGA, RASAYANI, MUMBAI
LOCATION: 75 KMS FROM MUMBAI AIRPORT
AREA OF PLOT: 70 ACRES
CONSULTANT: HITEN SETHI & ASSOCIATES
SANCTIONED COST: 315 CRORES
PROJECT MANAGEMENT AGENCY: CPWD
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NISM, PATALGANGA NEAR MUMBAI
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FACILITIES
• ORIENTATION BLOCK• ACADEMIC BLOCKS – 4• LIBRARY• OPEN AIR AMPHITHEATRE• DINING HALL• AUDITORIUM• RECREATION BLOCK• HOSTELS – 4• RESIDENTIAL BLOCK• UTILITY BLOCK• DIRECTOR’S BUNGALOW
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GLASS FIBRE REINFORCED CONCRETE PANELS
• GFRC panels have been used in the façade of orientation block. As maybe seen, external surface is curvilinear and thus a material for claddingwas searched which may fit exactly the architectural design envisaged.Simultaneously, it was the requirement that the material is weatherproof and durable. Due to suitability of GFRC panels, they were adoptedas they could be manufactured in any shape.
• Hot dipped galvanized M.S framework and brackets were used forsupporting the GFRC panels. Minimum thickness of GFRC panels wasadopted as 15 mm whereas thicknesses at return flange/embeddedlocation was kept as 50 mm. The panels were strengthened by providingsufficient nos. of horizontal and vertical stiffeners of stainless steel grade316 of required shape and size as per design requirement.
• The panels consisted of glass fibers of @ 3.5 to 5% by weight, silica,white cement and admixtures. Water repellant coating was applied onthe panels by dipping panels in required solution to withstandatmospheric conditions.
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POST TENSIONED SLAB
Post tensioned (PT) slabs were used in some portions ofacademic blocks. This provided additional headroom forthe services. Additionally such construction has advantagesof higher clear spans, thinner slabs, lighter structure,reduced cracking and deflections, reduction in storeyheight resulting into more storeys in same height, rapid,quality and skilled construction, and higher loadingperformance. It has to be ensured that the slab is notdrilled during lifetime of the structure as it may damagepre-stressing and lead to failure.
• After placement of steel and tendons, concreting is firstdone except at the end from where stressing is done,excess length cut and grouting carried out around thetendons.
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AAC BLOCKS
• Factory made AAC blocks have been used inall masonry work. The blocks have lowdensity (about 550 kg per cum) and are eco-friendly.
• Are light weight
• Have good acoustic and insulation properties.
• The blocks reduce the weight of structureand also produce quality construction.
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FALSE CEILING AND PANELLING
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ORIENTATION BLOCK
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ACADEMIC CUM ADMINISTRATIVE BLOCK
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ACCOUSTIC FALSE CEILING
• Anutone Salon Slat plus False ceiling
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NAMASTE FURNITURE
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STAMPED CONCRETE
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• Stamped concrete is concrete that is patterned or texturedor embossed to resemble a required pattern may be brick,stone, slate, tile or wood. It is used for footpaths, walkways,driveways etc.
• In laying stamped concrete, base was prepared with RCCthough if sub grade is found suitable, it can be provided withplain concrete also. Over the concrete layer finished to thegrade, colour hardener is added of the required shade in thefresh concrete as specified, troweled and floated. Approvedrelease agent is then applied evenly to the troweled surfacebefore stamping.
• While the concrete is still in plastic stage, required stampingtools are applied to the surface and curing carried out asspecified.
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EXPANDED POLYSTYRENE GEOFOAM BLOCKS
• Such blocks have been used in lecture halls on first and second floors ofthe academic blocks for construction of steps. The blocks are very lightand thus help in weight reduction. Due to light weight, their handlingand placing is also easy. In the present case density of the blocks usedwas 21.6 kg per cum.
• Despite its light weight, the material’s compressive resistance rangesfrom about 15,178 to 128,223 Pa at a one percent strain. When used inthe steps, the thickness of the blocks should be as per the requirementsof the riser and laid accordingly so that riser of the step is sum ofthickness of the block, wire mess and screed concrete including thicknessof flooring if any or carpet as proposed. Over the blocks, wire mesh isused to tie them, to keep in position and also for better bonding with theconcrete being laid over the blocks. Small thickness of concrete is usedfor protection and flooring to be laid as per the architecturalrequirements.
• When used in the walling, particularly in partition walls similarprocedure can be adopted except that wire mesh should be provided onboth sides of the wall.
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FLOORINGS
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GLASS
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ACOUSTIC PANELS
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ALUMINIUM LOUVERS
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Service trenches
• Not a very new concept
• Being adopted in NISM
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