Autoclave aerated concrete blocks are also known as Auto clavedlight weight concrete(ALC) Autoclaved Aerated Concrete (AAC) is one of the eco – friendly and certified green building materials.AAC was perfected in the mid of 1920s by the Swedish architect. It has become one of the most used building materials in Europe and is rapidly growing in many other countries around the world. Basically, AAC is a mixture of cement, fly ash, sand, water, and aluminum powder. When the materials are proportionally weighed, AAC is using no aggregate larger than sand. Here, Aluminum powder reacts with calcium hydroxide and water to form H2. The hydrogen gas foams and doubles the volume of the raw mix creating gas bubbles shown. At the end of the foaming process, the hydrogen escapes into the atmosphere and is replaced by air. When the airs are removed from the material, it is solid but still soft. It is then cut into blocks and placed in a cylindrical chamber for 11-12 hours.

During this steam pressure hardening process, when the temperature reaches 190°C (374°F) and the pressure reaches to a maximum limit of 12 bar, sand reacts with calcium hydroxide to form calcium silicate hydrate, which gives AAC its high strength and light weight properties, solid but soft in nature. After the autoclaving process, the material is ready for immediate use on the construction site. It has become one of the most used building materials in Europe and is rapidly growing in many other countries around the world. The characteristic of AAC is helpful in green housings and saves fertile lands and a solution for fly ash disposal.

Autoclaved aerated concrete is a versatile lightweight construction material and usually used as blocks. Compared with normal (ie: “dense” concrete) aircrete has a low density and excellent insulation properties.

The low density is achieved by the formation of air voids to produce a cellular structure. These voids are typically 1mm-5mm across and give the material its characteristic appearance. Blocks typically have strengths ranging from 3-9 Nmm-2 (when tested in accordance with BS EN 771-1:2000). Densities range from about 460 to 750 kg m-3; for comparison, medium density concrete blocks have a typical density range of 1350-1500 kg m-3 and dense concrete blocks a range of 2300-2500 kg m-3.

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The low density is achieved by the formation of air voids to produce a cellular structure. These voids are typically 1mm-5mm across and give the material its characteristic appearance. Blocks typically have strengths ranging from 3-9 Nmm-2 (when tested in accordance with BS EN 771-1:2000). Densities range from about 460 to 750 kg m-3; for comparison, medium density concrete blocks have a typical density range of 1350-1500 kg m-3 and dense concrete blocks a range of 2300-2500 kg m-3.

Autoclaved aerated concrete blocks are excellent thermal insulators and are typically used to form the inner leaf of a cavity wall. They are also used in the outer leaf, when they are usually rendered, and in foundations. It is possible to construct virtually an entire house from autoclaved aerated concrete, including walls, floors - using reinforced aircrete beams, ceilings and the roof. Autoclaved aerated concrete is easily cut to any required shape.

Aircrete also has good acoustic properties and it is durable, with good resistance to sulfate attack and to damage by fire and frost.

AERATED CONCRETE BLOCKS

Aerated Concrete Blocks exhibit their superiority  over  the conventional  concrete  blocks by virtue of their  light  weight. This is attributed to the fact that these blocks are porous  with small air holes (Not for air pass).

Another specificity  of  Aerated concrete  blocks  is  their strength being more than the conventional concrete block.

INTRODUCTION
AERATED CONCRETE BLOCKS
AUTOCLAVED AERATED CONCRETE
STACKED BLOCKS OF AAC (WRAPPED IN FOIL)
RAW MATERIALS
FLY ASH SAND LIME AERATED BLOCKS
AUTOCLAVED AERATED CONCRETE BLOCKS
ADVANTAGES OF AUTOCLAVED AERATED CONCRETE BLOCKS:
PROPOSAL:
USES AND APPLICATIONS
AERATED CONCRETE BLOCKS
PROPERTIES
COMPOSITION OF PORTLAND CEMENT
ORDINARY PORTLAND CEMENT MAY HAVE THE COMPOSITION AS BELOW
B.I.S. SPECIFICATION
MARKET SURVEY
INVESTMENT BOOST IN INFRASTRUCTURE THROUGH HIGHER
PUBLIC FUNDING POSITIVE
FUTURE OF CONSTRUCTION MARKET IN INDIA
LATEST MARKET RESEARCH REPORT (2014) BY PWC HIGHLIGHTS:
GROWTH DRIVERS
INVESTMENT OPPORTUNITIES IN INDIA
FDI POLICIES
FDI POLICY FOR INDUSTRIAL PARKS
ADVANTAGE INDIA
8 TOP REASONS TO INVEST IN INDIA
1. SIZE OF INDIA
2. ECONOMIC GROWTH
3. DIVERSITY
4. DEMOGRAPHICS
5. HIGH SAVINGS
6. DOMESTIC ECONOMY
7. A ROBUST FINANCIAL SECTOR
8. QUALITY OF INVESTMENT MARKETS
DETAILED EXPORT DATA OF AUTOCLAVED BLOCK
INDIA BRICKS AND BLOCKS MARKET TO 2021 – FOCUS ON AAC BLOCK
SCENARIO OF AAC BLOCK MARKET
OVERVIEW OF CONSTRUCTION INDUSTRY
MARKET SHARE OF DIFFERENT WALLING MATERIALS
COMPOSITION AND CHEMISTRY OF AAC
THE FINAL HYDRATION PRODUCTS ARE THEN PRINCIPALLY:
CALCIUM SILICATE HYDRATE COMPOSITIONS IN AAC
OTHER HYDROTHERMALLY-FORMED MINERALS:
ENVIRONMENTAL BENEFITS OF AUTOCLAVED AERATED CONCRETE
ADVANTAGE AND DISADVANTAGE OF AAC BLOCK
ADVANTAGES
BRICKS AND AAC BLOCKS
TECHNICAL SPECIFICATION OF AAC BLOCKS
TECHNICAL SPECIFICATIONS & COMPARISON BETWEEN BRICK
AND AAC BLOCK
COMPARISION BETWEEN BRICK AND AAC BLOCK
FORMULATION OF AAC BLOCKS
MANUFACTURING PROCESS OF AAC BLOCKS
DETAILS OF DOSING AND MIXING
PROCESS FLOW DIAGRAM
DETAILED MANUFACTURING PROCESS OF AAC BLOCKS
BRIEF PRODUCTION PROCESS:
COAL FLY ASH:
QUICK LIME:
GYPSUM:
CEMENT:
ALUMINUM POWDER PAST:
SCRAPE AND WASTE SLURRY:
BATCHING, MIXING, AND CASTING:
CUTTING AND GROUPING:
AUTOCLAVED AND FINISHED PRODUCT:
THE BOTTOM PLATE RETURNING, COMBINING WITH MOULD AND OILING:
AERATED CONCRETE BLOCK MACHINE
PRODUCT DESCRIPTION
INTRODUCE
AERATED CONCRETE COMMON CONCEPTION
ADVANTAGES LIGHT WEIGHT
KEEPING TEMPERATURE
HAVE MANY KINDS MATERIAL, HAVE LOWEST WASTE
AVAILABLE ABOVE MACHINE AT:
PRESENT MANUFACTURERS/SUPPLIERS OF AAC BLOCKS
SUPPLIERS OF PLANT AND MACHINERY
COMPLETE PLANT AND EQUIPMENTS SUPPLIERS
FOR AERATED CONCRETE BLOCKS (FOREIGN)
SUPPLIERS OF RAW MATERIALS
FLYASH
CEMENT
GYPSUM
LIME POWDER
ALUMINUM POWDER
COMPLETE PLANT AND MACHINERY SUPPLIERS AND TECHNICAL
ADVISORS FOR AAC BLOCKS

APPENDIX – A:

1.      COST OF PLANT ECONOMICS
2.      LAND & BUILDING
3.      PLANT AND MACHINERY
4.      FIXED CAPITAL INVESTMENT
5.      RAW MATERIAL
6.      SALARY AND WAGES
7.      UTILITIES AND OVERHEADS
8.      TOTAL WORKING CAPITAL
9.      COST OF PRODUCTION
10.      PROFITABILITY ANALYSIS
11.      BREAK EVEN POINT
12.      RESOURCES OF FINANCE
13.      INTEREST CHART
14.      DEPRECIATION CHART
15.      CASH FLOW STATEMENT
16.      PROJECTED BALANCE SHEET

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