Autoclave Aerated Concrete
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Transcript of Autoclave Aerated Concrete
AUTOCLAVED AERATED CONCRETE-A SUSTAINABLE BUILDING
MATERIAL
Submitted by
Anuya BhideAkshata DeshpandePramod MandadeSamira Ahmed
Need for AAC
Problem of disposal of fly-ashTop soil erosionSand crisisPollution caused in manufacture of clay
bricksIncrease in demand for cement, sand, steelTotal environmental imbalance
Solution……Autoclaved Aerated Concrete
What is AAC?
AAC is a lightweight product consisting of calcareous materials and/or lime and siliceous fine materials and water to form a homogeneous cell structure.
Cellular structure is attained by the inclusion of microscopic voids originating from a chemical reaction.
It is recommended by Indian Green Building Council (IGBC) as for material of choice for LEED certification and offers cost savings up to 40% due to huge savings in structural costs and increase in floor space area.
CLOSE–UP VIEW OF AAC
Properties of AAC
Light weight Workability
Acoustic Insulation
Mold and Pest Resistance
Fire Resistance
Properties of AAC
Thermal insulation provided by AAC
Graph for k values of different construction materials
Properties of AAC
Other important properties:DurabilityImproved Indoor Air QualitySustainable under seismic loadsCost Effectiveness.
Comparison of properties of the different building materials
Sr.
No.
Properties AAC Clay Bricks Concrete Blocks
1 Basic Materials Cement, Sand,
Fly-Ash and
Aeration
compounds
Top
agricultural
Soil
Cement, Sand
and Aggregates
2 Dry Density (Kg/m3) 800 1900 1700
3 Co-Efficient Of
Thermal Conductivity
(k)
0.16 0.84 2
4 Sound Insulation Superior Normal Better
5 Workability Good (Can be
cut, sawn,
nailed, drilled)
Normal Difficult
6 Energy Efficiency Can Consume
fly-ash, Low
energy
requirement
Top Soil
Erosion,
High Energy
Requirement
Medium
Energy
Consumption
7 Eco-friendliness A green
product
Creates
pollution
High sand
consumption
Manufacture of AAC
The manufacturing process of AAC is completed in to the following four steps:
1) Assembling and mixing of the raw materials.
2) Adding of the expansion agent.
3) Expansion, shaping, pre-curing, and cutting.
4)Final curing utilizing an autoclave.
Sand ground to require finenessSand is ground to
the required fineness
raw materials batched by weight and
delivered to the mixer.
water and expansive agent are added to the
mixer
the slurry is poured into the
molds
the initial hydration of cementitious
compounds gives sufficient strength to
hold its shape in a few hours
the volume increases by 50% in the molds within 3 hours, due to expansive agents.
aerated concrete product is
transported to a large autoclave, where the curing
process is completed.
AAC units are normally placed on pallets for
shipping
Overall Steps in Manufacture of AAC
AAC blocks ready to be removed from Autoclave
Exterior view of Autoclaves
Interior view of Autoclaves
Environmental Benefits of AAC
produces no waste products or pollution.avoid usage of topsoilmanufactured with abundant recycled raw materials such
as fly-ash reduces energy consumption.
Methodology
Study of AAC- includes1.Need for a substitute2.AAC as a solution3.Properties of AAC4.Manufacturing of AAC5.Environmental benefits by use of AAC
Methodology
Comparison of AAC with clay bricks- includes1.Sustainability2.Cost effectiveness3.Environmental benefits
Expected results
AAC is a better product which can solve some of the alarming problems in the construction industry.
Hence its use in construction should be increased in order to have building with less impact on the environment.