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144188195215245280

M.J Engineering Co.

Kolkata, West Bengal
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M.J Engineering Co. - Service Provider of structural restoration, thermal insulation & fiber glass treatment in Kolkata, West Bengal.

Structural Restoration
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Structural Restoration

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Shotcrete, then known as guniting, was invented in the early 1900s by American taxidermist Carl Akeley, used to fill plaster models of animals. He used the method of blowing dry material out of a hose with compressed air,injecting water at the nozzle as it was released. This was later used to patch weak parts in old buildings. In 1911, he was granted a patent for his inventions, the "cement gun", the equipment used, and "gunite", the material that was produced.


Until the 1950s when the wet-mix process was devised, only the dry-mix process was used. In the 1960s, the alternative method for gunning by the dry method was devised with the development of the rotary gun, with an open hopper that could be fed continuously. Shotcrete is also a viable means and method for placing structural concrete.
 
The nozzleman is the person controlling the nozzle that delivers the concrete to the surface. The nozzle is controlled by hand on small jobs, for example the construction of small swimming pools. On larger work the nozzle can sometimes be held by mechanical arms where the nozzleman controls the operation by a hand-held remote control.

The dry mix method involves placing the dry ingredients into a hopper and then conveying them pneumatically through a hose to the nozzle. The nozzleman controls the addition of water at the nozzle. The water and the dry mixture is not completely mixed, but is completed as the mixture hits the receiving surface. This requires a skilled nozzleman, especially in the case of thick or heavily reinforced sections. Advantages of the dry mix process are that the water content can be adjusted instantaneously by the nozzleman, allowing more effective placement in overhead and vertical applications without using accelerators. The dry mix process is useful in repair applications when it is necessary to stop frequently, as the dry material is easily discharged from the hose.

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Thermal Insulation
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Thermal Insulation

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We wish to inform you that light weight gas ,cellular or foam concrete thermal insulation is manufactured out of cement, sand ,foaming agent &water.A wet poured fill of foam concrete mix will form a monolithic mass embodying millions of microscopic air cells.It is this unique cellular structure that gives foam concrete remarkable properties. Of thermal resistance,homogenity & temperature control.when the fluid slurry is poured into the mould at site,it will generally attain 50% of the desired height in the mould.Gradually the whole mass in the mould will rise to the desired height.Gas formation will automatically stop as soon as the desired height is attained. The mass should should not be disturbed for the next 48 hours.curing with water is done for 4-5 days.A layer of P.C.C is provided on top of it to Which acts as a layer of protection. Density of foam concrete is 18.18kg/c ft.Foam concrete helps to reduce the temperature to around 6-7degrees.It is mainly used in the roofs of power house,steel plants,factories , residential buildings and commercial buildings.

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Fiber Glass Treatment
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Fiber Glass Treatment

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We are specializing in waterproofing of roofs,external surface of buildings,basements,new toilets,overhead water tanks,underground water tanks, tunnels,expansion joints etc.

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Chemical Treatment
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Chemical Treatment

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Mainly done in basements, over head and under ground water tanks etc.
The main function of injection grouting is to fill up voids & gaps within the concrete and make the surface impervious.

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Membrane Treatment
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Membrane Treatment

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Fixing membrane on the roof surface prevents water leakage.
Membrane have a tendency of expansion & contraction according to different weather conditions preventing the development of cracks.
It also has a tendency of absorbing vehicular & structural vibration.

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About Us

M.J Engineering Co. - Service Provider of structural restoration, thermal insulation & fiber glass treatment in Kolkata, West Bengal.

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