Aac (autoclaved aerated concrete) blocks


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Autoclaved aerated concrete (AAC), also known as autoclaved cellular concrete (ACC), autoclaved lightweight concrete (ALC), autoclaved concrete, cellular concrete, porous concrete, Ytong, Hebel Block, Aircrete, Thermalite. http://dir.indiamart.com/impcat/aac-block-manufacturing-unit.html

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Aac (autoclaved aerated concrete) blocks

  1. 1. What is AAC: Autoclaved aerated concrete (AAC), also known as autoclaved cellular concrete (ACC), autoclaved lightweight concrete (ALC), autoclaved concrete, cellular concrete, porous concrete, Ytong, Hebel Block, Aircrete, Thermalite. When was AAC first developed: AAC was developed in 1924 by a Swedish architect, who was looking for an alternate building material with properties similar to that of wood – good thermal insulation, solid structure and easy to work with – but without the disadvantage of combustibility, decay and termite damage. It has been refined into a highly thermally insulating concrete-based material used for both internal and external construction. AAC products include blocks, wall panels, floor and roof panels, and lintels. AAC Blocks Manufacturers
  2. 2. Advantages AAC has been produced for more than 70 years, and it offers several significant advantages over other cement construction materials, one of the most important being its lower environmental impact. * Improved thermal efficiency reduces the heating and cooling load in buildings. * Workability allows accurate cutting, which minimizes the generation of solid waste during use. * Resource efficiency gives it lower environmental impact in all phases of its life cycle, from processing of raw materials to the disposal of waste. * Light weight saves cost & energy in transportation. * Light weight saves labor expenses. * Light weight increases chances of survival during seismic activity.
  3. 3. * Larger size leads to faster masonry work. * Termite/Pest Resistant * Cost Effective * Precision * Earthquake Resistant * Easy Workability and Design Flexibility * Thermally Insulated & Energy Efficient * Fire Resistant * Eco-friendly
  4. 4. Sizes: Both blocks and panels are available. Blocks are stacked similarly to conventional masonry, but with a thin-bed mortar, and panels are stood vertically, spanning full-story heights. * Panels extend from floor to top of the wall: Height: up to 20 ft Width: 24 in. Thickness: 6, 8, 10, or 12 in. (4 in. thick interior partition panels are available) * Blocks are larger and lighter than traditional concrete masonry: Height: 8 in. typical Width: 24 in. long Thickness: 4, 6, 8, 10, and 12 in. A standard 8 x 8 x 24 in. unit weighs about 33 lbs. * Specialty shapes: U-shaped bond beam or lintel blocks are available in thicknesses of 8, 10, and 12 in. Tongue and groove blocks are available from some manufacturers, and these connect to adjacent units without mortar at vertical edges Cored blocks available for creating vertical reinforced grouted cells
  5. 5. AAC Blocks Manufacturers
  6. 6. Manufacturing and Physical Properties This manufacturing process produces a lightweight, noncombustible material with the following properties: Density: 20 to 50 pcf (lb per cu ft)—this is light enough to float in water Compressive strength: 300 to 900 psi Allowable shear stress: 8 to 22 psi Thermal resistance: 0.8 to 1.25 per in. of thickness Sound transmission class (STC): 40 for 4 in. thickness; 45 for 8 in. thickness
  7. 7. Installation, Connections and Finishes Due to the similarity to traditional concrete masonry, AAC units (block) can be easily installed by concrete masons. Depending on the type of finish selected, they can be directly adhered or mechanically attached to the face of AAC. * Block: First course is laid and leveled. Blocks are stacked together with thin-bed mortar in a running bond with a minimum of 6-in. overlap. Walls are plumbed, leveled, and squared with a rubber mallet. Openings and odd angles are cut with a handsaw or bandsaw. Reinforcement locations are determined, rebar placed, and grouting occurs. Grout must be mechanically vibrated to consolidate it. Bond beams are placed at the top of the wall and can be used for heavy- duty fixture attachment.
  8. 8. * Panels: ~ Panels are placed one at a time, starting from the corner. Panels are set into a layer of thin-bed mortar and vertical rebar is attached to dowels extending up from the floor before the adjacent panel is placed. ~ A continuous bond beam is created at the top, either with plywood and AAC material or with bond beam block. ~ Openings can be precut or field cut. * Connections: ~ Roof frame/framing is connected to a conventional top plate or hurricane straps embedded in the bond beam. ~ Floor framing is attached with standard ledgers anchored to the side of the AAC assembly adjacent to a bond beam. ~ AAC floor systems bear directly on top of AAC walls. ~ Larger structural steel members are set on weld plates or bolt plates set into the bond beam.
  9. 9. Finishes: Stucco-type finishes are made specifically for AAC. These polymer- modified plasters seal against water intrusion yet allow moisture vapor for breathability. Conventional siding materials are mechanically attached to the wall face. Furring strips should be employed if back ventilation of the siding material is desirable. Masonry veneers can be directly adhered to the wall face or can be built as cavity walls. Direct-applied veneers are typically lightweight materials like manufactured stone. AAC Blocks Manufacturers
  10. 10. AAC Blocks Manufacturers