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Sunday, 25 December 2016

āϰāĻĄেāϰ āĻ—া⧟ে 500W āϞেāĻ–া āĻŦāϞāϤে āĻ•ি āĻŦোāĻা⧟ ?


....................................................................
āω: āĻāĻ–াāύে W āĻĻ্āĻŦাāϰা weld āĻŦোāĻা⧟ āϝাāϰ
āĻŦ্āϝāĻŦāĻšাāϰিāĻ• āĻ…āϰ্āĻĨ āĻšāϞো āĻĒ্āϰāϤিāĻ•্āϰি⧟া . . . . . āĻ…āϰ্āĻĨাā§Ž
āϰāĻĄেāϰ āĻ•āĻŽ্āĻĒ্āϰেāϏিāĻ­ āϞোāĻĄ āĻŦāĻšāύেāϰ āĻļāĻ•্āϤি , , , , , āφāϰ 500
āĻšāϞো āĻŽেāĻ—াāĻĒ্āϝাāϏ্āĻ•েāϞে āĻĻে⧟া āĻĨাāĻ•ে āϝেāϟা
āĻĒিāĻāϏāφāχ āĻ āύিāϤে āĻšāϞে 145 āĻĻাāϰা āĻ—ুāύ āĻ•āϰāϤে
āĻšāĻŦে , , , 500×145=72500 āĻĒিāĻāϏāφāχ , , ,
1 Mpa=145psi .
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āĻ…āϰ্āĻĨাā§Ž āϰāĻĄেāϰ āĻĒি⧜āύ āĻŦāĻšāύ āĻ•āϰাāϰ āĻļāĻ•্āϤি 72500
āĻĒিāĻāϏāφāχ āĻŦা āϰāĻĄāϟি 72.5 āĻ—্āϰেāĻĄেāϰ āĻāĻŦং 500
āĻŽেāĻ—াāĻĒ্āϝাāϏ্āĻ•েāϞ

āĻāϟা āϰাāϏ্āϤা āύিāϰ্āĻŽাāĻŖেāϰ āĻāĻ•āϟা āϟেāĻ•āύিāĻ•..




āφāĻŽāϰা āĻĒ্āϰা⧟ āĻĒ্āϰāϤিāĻĻিāύāχ āϏিāĻŽেāύ্āϟ āύি⧟ে āĻ•াāϜ āĻ•āϰি। āĻ•িāύ্āϤু āĻāχ āĻŦিāώ⧟āĻ—ুāϞি āϜাāύি āĻ•ি?


ā§§। āĻ•োāύ āϏিāĻŽেāύ্āϟে āĻĢ্āϞাāχāĻāĻļ āĻĨাāĻ•ে? OPC āύা PCC āϏিāĻŽেāύ্āϟে?
⧍। āϏিāĻŽেāύ্āϟে āĻĢ্āϞাāχ āĻāĻļ āĻāϰ āĻ•াāϜ āĻ•ি
ā§Š।? āϏিāĻŽেāύ্āϟে āĻĢ্āϞাāχ āĻāĻļ āĻĨাāĻ•া āĻ–াāϰাāĻĒ āύাāĻ•ি āĻ­াāϞ?
ā§Ē। āĻ•āϤ āĻĒাāϰ্āϏেāύ্āϟ āĻĨাāĻ•া āωāϚিā§Ž?
āωāϤ্āϤāϰঃ ā§§। OPC means Ordinary Portland Cement and PCC means Portland Composite Cement. āĻ…āϰ্āĻĨ āĻŦুāĻা āĻ—েāĻ›ে? āϤাāĻšāϞে āϤো āĻ•োāύ āϏিāĻŽেāύ্āϟে āĻĢ্āϞাāχāĻāĻļ āĻĨাāĻ•ে āϏেāϟাāĻ“ āĻŦুāĻা āϝাāĻ“ā§Ÿাāϰ āĻ•āĻĨা। āĻĒāϰিāϏ্āĻ•াāϰ āĻ•āϰ āĻŦāϞāϞে Ordinary āĻŽাāύে Ordinary, āĻŽাāύে āϏাāϧাāϰāύ, āϝাāϤে āĻ•িāĻ›ু āĻĨাāĻ•āĻŦেāύা। āϤাāĻšāϞে PCC āϏিāĻŽেāύ্āϟে āĻĢ্āϞাāχāĻāĻļ āĻĨাāĻ•ে।
⧍। āϏিāĻŽেāύ্āϟে āĻ•েāύ āĻĢ্āϞাāχāĻāĻļ āĻĨাāĻ•ে।
āĻ•) āφāϰ্āĻĻāĻļ āĻŽাāύে OPC āϏিāĻŽেāύ্āϟেāϰ āĻāĻ•āϟা āύিāϰ্āĻĻিāώ্āϟāĻŽাāϤ্āϰা āĻĒাāύিāϰ āϏাāĻĨে āĻŦিāĻ•্āϰি⧟া āĻ•āϰে।āĻŦাāĻ•ি āĻ…ংāĻļāϟāĻ•ু āφāϜীāĻŦāύ āĻ…āĻ•্āώāϤ āĻ…āĻŦāϏ্āĻĨা⧟ āĻĨেāĻ•ে āϝা⧟। āϝা āĻļুāϧু āĻ…āϰ্āĻĨেāϰ āĻ…āĻĒāϚ⧟ āĻ•āϰে।
āĻ–) āĻĒুāϰু āĻ•ংāĻ•্āϰিāϟেāϰ āĻĸাāϞাāĻ‡ā§Ÿে āϝে āϤাāĻĒ āĻ‰ā§ŽāĻĒāύ্āύ āĻšā§ŸāϤা āϧীāϰে āϧীāϰে āĻŦিāĻ•িāϰāύ āύা āĻ•āϰāϞে āĻšি⧟াāϰ āĻ•্āϰ্āϝাāĻ• āĻāϰ āĻĒ্āϰāϏ্āĻĨ āĻŦেāĻļী āĻšāĻŦে। āĻĢāϞে āĻ•ংāĻ•্āϰিāϟ āĻĻুāϰ্āĻŦāϞ āĻšāĻŦে। āĻĢ্āϞাāχāĻāĻļ āĻ•ংāĻ•্āϰিāϟেāϰ āϤাāĻĒ āĻŦিāĻ•িāϰāύ āϧীāϰে āĻ•āϰāϤে āϏাāĻšাāϝ্āϝ āĻ•āϰে।
āĻ—) āĻĢ্āϞাāχāĻāĻļ āĻĨাāĻ•āϞে āĻĢ্āϞোāϰ āĻĢিāύিāĻļিং āϟা āϏুāύ্āĻĻāϰ āĻšā§Ÿ।
āϤ) āϤāĻŦে āĻ•িāĻ›ু āĻ•িāĻ›ু āĻ•্āώে্āϤ্āϰে āĻĢ্āϞাāχāĻāĻļ āύা āĻĨাāĻ•াāχ āĻ­াāϞো।
ā§Ē) āϏাāϧাāϰāύāϤ āϏিāĻŽেāύ্āϟে ā§§ā§Ģ~⧍ā§Ģ% āĻĒāϰ্āϝāύ্āϤ āĻĢ্āϞাāχāĻāĻļ āĻĨাāĻ•ে। āϤāĻŦে āϏেāϟা ā§Šā§Ļ% āĻĨাāĻ•āϤে āĻĒাāϰে।

āĻ“āĻ­াāϰ āĻŦ্āϰীāϜ āύিāϰ্āĻŽাāύ āĻ•āϰে āĻŦāύ্āϝāĻĒ্āϰাāĻŖী āϏংāϰāĻ•্āώāĻŖ

āϏিংāĻ—াāĻĒুāϰ āϏāϰāĻ•াāϰ āĻŦāύ্āϝāĻĒ্āϰাāĻŖী āϝাāϤা⧟াāϤেāϰ āϜāύ্āϝ āϰাāϏ্āϤাāϰ āωāĻĒāϰ āĻĒāĻļুāĻĻেāϰ āωāĻĒāϝোāĻ—ী āĻ“āĻ­াāϰ āĻŦ্āϰীāϜ āύিāϰ্āĻŽাāύ āĻ•āϰে āĻŦāύ্āϝāĻĒ্āϰাāĻŖী āϏংāϰāĻ•্āώāĻŖ āĻ•āϰে ।

āĻāϰāĻ•āĻŽāĻ­াāĻŦে āĻ­āĻŦāύেāϰ āϧ্āĻŦংāϏ āύীāϰāĻŦে āĻĻেāĻ–া āĻ›া⧜া āφāϰ āĻ•িāĻ›ুāχ āĻ•āϰাāϰ āύেāχ....

āĻ­āĻŦিāώ্āĻ¯ā§Žāϟা āĻāĻŽāύāχ āĻšā§Ÿে āϝাāĻŦে.......

Interesting space management ideas.
https://www.facebook.com/mrinalkanti.karmahapatra/videos/554335751438576/


āĻ­āĻŦāύেāϰ āĻ›াāĻĻ āĻĻি⧟ে āĻŦৃāώ্āϟিāϰ āϜāϞ āĻ েāĻ•াāϤে āĻ›াāϤা


āϏ্āĻŦāĻĒ্āύ‌েāϰ āĻĒāĻĻ্āĻŽা āϏ‌েāϤু.......


✬ āĻŽূāϞ āϏেāϤুāϰ āĻĻৈāϰ্āϘ্āϝ – ā§Ŧ.ā§§ā§Ģ āĻ•িāϞোāĻŽিāϟাāϰ।
✬ āĻĒ্āϰāϏ্āĻĨ – āĻĻ্āĻŦিāϤীāϝ় āϤāϞাāϝ় (āφāĻĒাāϰ āĻĄেāĻ•ে) ⧭⧍ āĻĢুāϟেāϰ āϚাāϰ āϞেāύেāϰ āϏāĻĄ়āĻ•।
✬ āϰেāϞāϞাāχāύ – āύিāϚ āϤāϞাāϝ় (āϞোāϝ়াāϰ āĻĄেāĻ•ে) āĻĄাāĻŦāϞ āĻ—েāϜ।
✬ āĻĒিāϞাāϰ āϏংāĻ–্āϝা – ā§Ē⧍ (āύāĻĻীāϤে ā§Ēā§Ļāϟি)।
✬ āĻ­াāϝ়াāĻĄাāĻ•্āϟ – āĻĻুāχ āĻĒ্āϰাāύ্āϤে āϏāϰ্āĻŦāĻŽোāϟ ā§Š āĻĻāĻļāĻŽিāĻ• ā§§ā§Ž āĻ•িāϞোāĻŽিāϟাāϰ।
✬ āϏংāϝোāĻ— āϏāĻĄ়āĻ• – āĻĻুāχ āĻĒ্āϰাāύ্āϤে ā§§ā§Ē āĻ•িāϞোāĻŽিāϟাāϰ।
✬ āύāĻĻীāĻļাāϏāύ – āĻĻুāχ āĻĒাāĻĄ়ে ⧧⧍ āĻ•িāϞোāĻŽিāϟাāϰ।
✬ āĻĒ্āϰāĻ•āϞ্āĻĒেāϰ āĻŽোāϟ āĻŦ্āϝāϝ় :ā§¨ā§Ž āĻšাāϜাāϰ ā§­ā§¯ā§Š āĻ•োāϟি ā§Šā§¯ āϞাāĻ– āĻŽূāϞ āϏেāϤুāϤে।
✬ āĻŦ্āϝāϝ় – ⧧⧍ āĻšাāϜাāϰ ā§§ā§Šā§Š āĻ•োāϟি ā§Šā§¯ āϞাāĻ–।
✬ āύāĻĻীāĻļাāϏāύ āĻŦ্āϝāϝ় – ā§Ž āĻšাāϜাāϰ ā§­ā§Ļā§­ āĻ•োāϟি ā§Žā§§ āϞাāĻ–।
✬ āĻ…āύ্āϝাāύ্āϝ āĻŦ্āϝāϝ় – ā§­ āĻšাāϜাāϰ ⧝ā§Ģ⧍ āĻ•োāϟি ⧧⧝ āϞাāĻ–।
✬ āϜāύāĻŦāϞ – āĻĒ্āϰাāϝ় ā§Ē āĻšাāϜাāϰ।
✬ āĻ­াāϝ়াāĻĄাāĻ•্āϟ āĻĒিāϞাāϰ – ā§Žā§§ āϟি।
✬ āĻĒাāύিāϰ āϏ্āϤāϰ āĻĨেāĻ•ে āωāϚ্āϚāϤা – ā§Ŧā§ĻāĻĢুāϟ।
✬ āĻĒাāχāϞিং āĻ—āĻ­ীāϰāϤা – ā§Šā§Žā§Š āĻĢুāϟ।
✬ āĻĒ্āϰāϤি āĻĒিāϞাāϰেāϰ āϜāύ্āϝ āĻĒাāχāϞিং – ā§Ŧ āϟি।
✬ āĻŽোāϟ āĻĒাāχāϞিং āϏংāĻ–্āϝা – ⧍ā§Ŧā§Ē āϟি।
✬ āύিāϰ্āĻŽাāĻŖāĻ•াāϜ āĻļেāώ – āĻĄিāϏেāĻŽ্āĻŦāϰ, ⧍ā§Ļā§§ā§Ž।
✬ āϏেāϤুāϤে āϝা āĻĨাāĻ•āĻ›ে – āĻ—্āϝাāϏ, āĻŦিāĻĻ্āϝুā§Ž āĻ“ āĻ…āĻĒāϟিāĻ•্āϝাāϞ āĻĢাāχāĻŦাāϰ āϞাāχāύ āĻĒāϰিāĻŦāĻšāύ āϏুāĻŦিāϧা।

Fingure print building, thailand


Civil Engineering is here


UFO, Beijing China




New Style : āĻŦাঁāĻļ āĻĻি⧟ে āĻĸাāϞাāχ


Style Stair



PLASTER OF PARIS Recipe (New Suchitra Builders)


Plaster of Paris is a Calcium sulfate semi-hydrate (CaSO4,½ H2O) derived from Gypsum, a calcium sulfate di-hydrate (CaSO4, 2H2O), by firing this mineral at relatively low temperature and thus reducing it to powder.

CaSO4,  2H2O  + HEAT -------> CaSO4, 1/2 H2O  + 1.5 H2O

In 1700’s, Paris was already the “Capital of plaster” since all the walls of wooden houses were covered with plaster, as a protection against fire. The King of France enforced rule after the big fire in England 1666.

Items Needed
(Apparatus) to make plaster of paris with glue

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2 parts Diluted White Glue

  •     1 part Warm Water
  •     Large Mixing Bowl
  •     Spatula or Wooden Spoon 
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  •     Gather all the materials and spread a sheet on the work surface.
  •     Now, pour the glue in the large mixing bowl and beat it well.
  •     Make a paste, by adding one part warm water to two parts of white glue.
  •     Mix the ingredients well. Continue stirring them, until there no visible lumps remain.
  •     If you do not get a soupy mixture, you can add more water to the bowl and mix well.
  •     The final product should be watery, but with a slight white glue consistency.
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Properties of Plaster Of Paris
  •     It is fine hygroscopic white powder
  •     Its melting point is 1630C
  •     Its density is 2.63 g/cm3
  •     It sets quickly on mixing with water giving out heat
  •     Expands slightly on setting
***********************************************
USES of Plaster of Paris

  • Because of its property of slight expansion on setting, it is used for filling cracks and holes in plaster
  • It is also used for filling cracks and knots in wooden surface before painting polishing
  • Plaster of Paris is used in making surgical bandages where movable parts of the body are to be held rigidly in place
  • It is used in chalk
  • As plaster of Paris has high melting point, it is used for plastering the walls of wooden houses, such as a protection against fire
  •  It is used for making models and statues.

Mild steel bars (as per IS: 432, part-I -1982) - New Suchitra Builders, EGRA


Mild steel bars are used for tensile stress of RCC (Reinforced cement concrete) slab beams etc. in reinforced cement concrete work. These steel bars are plain in surface and are round sections of diameter from 6 to 50 mm. These rods are manufactured in long lengths and can be cut quickly and be bent easily without damage.

Deformed steel bars (as per IS: 1786-1985)
 
As deformed bars are rods of steels provided with lugs, ribs or deformation on the surface of bar, these bars minimize slippage in concrete and increases the bond between the two materials. Deformed bars have more tensile stresses than that of mild steel plain bars. These bars can be used without end hooks. The deformation should be spaced along the bar at substantially uniform distances.  To limit cracks that may develop in reinforced concrete around mild steel bars due to stretching of bars and some lose of bond under load it is common to use deformed bars that have projecting ribs or are twisted to improve the bond with concrete. These bars are produced in sections from 6 mm to 50 mm dia.
  • In addition the strength of bonds of deformed bars calculated should be 40 to 80 % higher than that of plain round bars of same nominal size. And it has more tensile stress than that of plain round bars of same nominal size.
  • Cold twisted deformed (Ribbed or Tor Steel Bars) bars are recommended as best quality steel bars for construction work by structural Engineer.

Various Grades of Mild Steel Bars
Reinforcement bars in accordance with standard IS No. 432 part-I can be classified into following types.  
1) Mild Steel Bars: Mild steel bars can be supplied in two grades
     a)Mild steel bars grade-I designated as Fe 410-S or Grade 60
     b) Mild steel bars grade-II designated as Fe-410-o or Grade 40
2) Medium Tensile Steel Bars designated as Fe- 540-w-ht or Grade 75

Describe briefly the various methods of concrete curing (New Suchitra Builders-Egra)

 Curing is the process of maintaining the moisture and temperature conditions for freshly deployed concrete. This is done for small duration of time to allow the hardening of concrete. The methods that are involved in saving the shrinkage of the concrete includes:
  • (a) Spraying of water: on walls, and columns can be cured by sprinkling water.
  • (b) Wet covering of surface: can be cured by using the surface with wet gunny bags or straw
  • (c) Ponding: the horizontal surfaces including the slab and floors can be cured by stagnating the water.
  • (d) Steam curing: of pre-fabricated concrete units steam can be cured by passing it over the units that are under closed chambers. It allows faster curing process and results in faster recovery.
  • (e) Application of curing compounds: compounds having calcium chloride can be applied on curing surface. This keeps the surface wet for a very long time

Building Materials Information : Kitchen Flooring


  • Flooring is an especially noticeable characteristic in the often-used space of a kitchen. Find the material that is right for your kitchen's style and for your budget by reading our buying guides and taking our flooring finder quiz. If you are a serious cook and spend a lot of time on your feet in the kitchen, one key consideration is to find materials for kitchen flooring with a cushioning effect such as wood, laminate, cork, and vinyl. Brick, ceramic tile, and stone are durable but hard to stand on for extended periods of time without a cushioned mat on top. Another tip about making the right kitchen flooring selection is to look for materials low in maintenance and high in durability. Think about the time you have for cleaning and maintaining your kitchen flooring. Know that high-maintenance flooring might look great, but it also requires pampering to stay that way. Finally, select kitchen flooring complementary to the cabinets, wall coverings, furniture, and other design elements in the room. Wood blends into any decorating scheme, and there are a variety of eco-friendly options such as bamboo and engineered wood that up your style quotient. Laminates and vinyl are ideal choices if you're after a patterned or colorful contemporary look. And stone and concrete add fun to a neutral or tone-on-tone color scheme.

Building Materials Information : Flooring materials


The choice of material for floor covering is affected by factors such as cost, endurance, noise insulation, comfort and cleaning effort. Some types of flooring must not be installed below grade (lower than ground level), and laminate or hardwood should be avoided where there may be moisture or condensation.
The sub-floor may be finished in a way that makes it usable without any extra work, see:
  •     Earthen floor adobe or clay floors
  •     Solid ground floor cement screed or granolithic

Soft coverings
Carpet is a floor covering woven or felted from natural or man-made fibers. Fitted carpet is attached to the floor structure, extends wall-to-wall, and cannot be moved from place to place. An underlay will extend carpet life and improve comfort.
Rugs are also woven or felted from fibers, but are smaller than the room in which they are located, have a finished edge, and usually lie over another finished floor such as wood flooring. Rugs may either be temporarily attached to the flooring below by adhesive tape or other methods to prevent creep, or may be loose-laid.

Wood flooring
Many different species of wood are fabricated into wood flooring in two primary forms: plank and parquet. Hardwoods are typically much more durable than softwoods. Reclaimed lumber has a unique appearance and is used in green (environmentally responsible) building.
  • Laminate is a floor covering that appears similar to hardwood but is made with a plywood or medium density fiberboard ("MDF") core with a plastic laminate top layer. HDF laminate consists of high density fiberboard topped by one or more layers of decorative paper and a transparent protective layer. Laminate may be more durable than hardwood, but cannot be refinished like hardwood. Laminate flooring is available in many different patterns which can resemble different woods or even ceramic tile. It usually locks or taps together.
  • Bamboo flooring is a floor manufactured from the bamboo plant and is a type of hardwood flooring, though technically not a wood. Bamboo is known to be durable and environmentally friendly. It is available in many different patterns, colors, and textures.
  • Cork Flooring is a flooring material manufactured from the by-product of the cork oak tree. Cork floors are considered to be eco-friendly since the cork oak tree bark is stripped every nine to ten years and doesn't damage the tree. Cork flooring comes in both tiles and planks, and can have glue or glues-less installation.

Resilient flooring
Resilient flooring is made of material that has some elasticity. It includes many different manufactured products including linoleum, sheet vinyl, vinyl composition tile (VCT), cork (sheet or tile), rubber, and others. Performance surfaces used for dance or athletics are made of either wood or resilient flooring.

Hard flooring
Ceramic tiles flooring in Istanbul street
  • Ceramic tile includes a wide variety of clay products fired into thin units which are set in beds of mortar or mastic with the joints between tiles grouted. Varieties include quarry tile, porcelain tile, terracotta tile, and others.
  • Many different natural stones are cut into a variety of sizes, shapes, and thicknesses for use as flooring. Stone flooring is usually set in mortar and grouted similar to ceramic tile. Slate and marble are popular types of stone flooring.
  • New technologies are emerging since 2004 to produce hard floorings having the ability to light up when needed. These security glazing materials contain transparent LED embedded films laminated between glass.


Seamless chemical flooring
Many different seamless flooring materials are available. These are usually latex, polyester, urethane or epoxy compounds which are applied in liquid form to provide a completely seamless floor covering. These are usually found in wet areas such as laboratories or food processing plants. These may have granular or rubberized particles added to give better traction.

Sustainable flooring
 Sustainable flooring is produced from sustainable materials (and by a sustainable process) that reduces demands on ecosystems during its life-cycle. Some think that sustainable flooring creates safer and healthier buildings and guarantees a future for traditional producers of renewable resources that many communities depend onBrowse our materials guide to find the right carpeting and flooring for your home. Living rooms, bedrooms, kitchens, bathrooms, basements, and entryways all have unique flooring needs: wet spaces versus dry spaces, high-traffic versus low-traffic, subflooring differences, insulation needs. Our flooring guides and tips help to uncover those details that you might not have considered before. The differences between tile, carpet, hardwood, laminate, vinyl, linoleum, engineered flooring, and eco-friendly alternatives are vast, and our handy flooring guides help to ease some of the pressure of selecting a flooring material for your space that reflects your personal style and project budget. Cleaning, care, and upkeep also come into consideration when selecting the perfect flooring for you; learn about the pros and cons for each flooring type here. Discover the differences between ceramic, porcelain, and hard-bodied tile before you complete a do-it-yourself tile installation. Carpet tiles and area rugs are also good options for fickle tastes or for cushioning high-traffic areas; cleanable and replaceable, both options are easily switched out depending on taste, trends, and wear.

Building Materials Information : Flooring Information


Flooring is the general term for a permanent covering of a floor, or for the work of installing such a floor covering. Floor covering is a term to generically describe any finish material applied over a floor structure to provide a walking surface. Both terms are used interchangeably but floor covering refers more to loose-laid materials.
Materials almost always classified as floor covering include carpet, area rugs, and resilient flooring such as linoleum or vinyl flooring. Materials commonly called flooring include wood flooring, ceramic tile, stone, terrazzo, and various seamless chemical floor coatings.

Building Materials Information : Green building Materials


Green building (also known as green construction or sustainable building) refers to a structure and using process that is environmentally responsible and resource-efficient throughout a building's life-cycle: from siting to design, construction, operation, maintenance, renovation, and demolition. This requires close cooperation of the design team, the architects, the engineers, and the client at all project stages. The Green Building practice expands and complements the classical building design concerns of economy, utility, durability, and comfort.
Although new technologies are constantly being developed to complement current practices in creating greener structures, the common objective is that green buildings are designed to reduce the overall impact of the built environment on human health and the natural environment by:
  •     Efficiently using energy, water, and other resources
  •     Protecting occupant health and improving employee productivity
  •     Reducing waste, pollution and environmental degradation[2]

A similar concept is natural building, which is usually on a smaller scale and tends to focus on the use of natural materials that are available locally. Other related topics include sustainable design and green architecture. Sustainability may be defined as meeting the needs of present generations without compromising the ability of future generations to meet their needs.Although some green building programs don't address the issue of the retrofitting existing homes, others do. Green construction principles can easily be applied to retrofit work as well as new construction.
A 2009 report by the U.S. General Services Administration found 12 sustainably designed buildings cost less to operate and have excellent energy performance. In addition, occupants were more satisfied with the overall building than those in typical commercial buildings.

Building Materials Information : wall panel

Wall Panel

 
A wall panel is single piece of material, usually flat and cut into a rectangular shape, that serves as the visible and exposed covering for a wall. Wall panels are functional as well as decorative, providing insulation and soundproofing, combined with uniformity of appearance, along with some measure of durability or ease of replaceability. While there is no set size limit for a piece of material fulfilling these functions, the maximum practical size for wall panels has been suggested to be 24 feet by 8 feet, to allow for transportation.
Use of wall panels can reduce construction costs by providing a consistent appearance to the panelled surface without requiring the application of paint or another finishing material. Wall panels may be finished on only one side, if the other side is going to be against a brick or concrete wall, or a comparable structure. Alternately, the panels may, if assembled to an appropriate framework, substitute for having any other kind of wall at all. Holes may be cut or drilled into a wall panel to accommodate electrical outlets and other devices coming out of the wall.
There is a new type of eco friendly 3d wall panel made out of the fibrous residue of sugarcane. This fibres of crushed sugarcane stalks, remaining after raw sugar is extracted from the juice of the sugarcane by shredding it, is now the raw material, called bagasse, that forms the base of this easily installed eco friendly product. The raw material used for these 3d wall panel is 100% recycled, compostable and is therefore 100% biodegradable.

Building Materials Information : BARS

 BARS


Thermomechanical processing, also known as thermo-mechanical treatment (TMT), is a metallurgical process that integrates work hardening and heat-treatment into a single process.[1] A description of its application in rebar steel follows.
The quenching process produces a high strength bar from inexpensive low carbon steel. The process quenches the surface layer of the bar, which pressurizes and deforms the crystal structure of intermediate layers, and simultaneously begins to temper the quenched layers using the heat from the bar's core.
     Steel billets 125mm² ("pencil ingots") are heated to approximately 1100°C in a reheat furnace. Then, they are progressively rolled to reduce the billets to the final size and shape of reinforcing bar. After the last rolling stand, the billet moves through a quench box. The quenching converts the billet's surface layer to martensite, and causes it to shrink. The shrinkage pressurizes the core, helping to form the correct crystal structures. The core remains hot, and austenitic. A microprocessor controls the water flow to the quench box, to manage the temperature difference through the cross-section of the bars. The correct temperature difference assures that all processes occur, and bars have the necessary mechanical properties.
      The bar leaves the quench box with a temperature gradient through its cross section. As the bar cools, heat flows from the bar's centre to its surface so that the bar's heat and pressure correctly tempers an intermediate ring of martensite andbainite.
Finally, the slow cooling after quenching automatically tempers the austenitic core to ferrite and pearlite on the cooling bed.



     These bars therefore exhibit a variation in microstructure in their cross section, having strong, tough, tempered martensite in the surface layer of the bar, an intermediate layer of martensite and bainite, and a refined, tough and ductile ferrite and pearlite core.
When the cut ends of TMT bars are etched in Nital (a mixture of nitric acid and methanol), three distinct rings appear: 1. A tempered outer ring of martensite, 2. A semi-tempered middle ring of martensite and bainite, and 3. a mild circular core of bainite, ferrite and pearlite. This is the desired micro structure for quality construction rebar.
     In contrast, lower grades of rebar are twisted when cold, work hardening them to increase their strength. However, after thermo mechanical treatment (TMT), bars do not need more work hardening. As there is no twisting during TMT, no torsional stress occurs, and so torsional stress cannot form surface defects in TMT bars. Therefore TMT bars resist corrosion better than cold, twisted and deformed (CTD) bars.

Building Materials Information : Ready-mix concrete

Ready-mix concrete

Ready-mix concrete is concrete that is manufactured in a factory or batching plant, according to a set recipe, and then delivered to a work site, by truck mountedin–transit mixers. This results in a precise mixture, allowing specialty concrete mixtures to be developed and implemented on construction sites. The first ready-mix factory was built in the 1930s, but the industry did not begin to expand significantly until the 1980s, and it has continued to grow since then.


Ready-mix concrete is sometimes preferred over on-site concrete mixing because of the precision of the mixture and reduced work site confusion. However, using a pre-determined concrete mixture reduces flexibility, both in the supply chain and in the actual components of the concrete.
Ready-mix concrete is also referred as the customized concrete products for commercial purpose. Ready-mix concrete, or RMC as it is popularly called, refers to concrete that is specifically manufactured for delivery to the customer's construction site in a freshly mixed and plastic or unhardened state. Concrete itself is a mixture of Portland cement, water and aggregates comprising sand and gravel or crushed stone. In traditional work sites, each of these materials is procured separately and mixed in specified proportions at site to make concrete. Read-mix concrete is bought and sold by volume - usually expressed in cubic meters (cubic yards in the US).


Ready-mix concrete is manufactured under controlled operations and transported and placed at site using sophisticated equipment and methods. In 2011, there were 2,223 companies employing 72,924 workers that produced RMC in the United States.

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