Transcript Autoclaved Aerated Concrete

Autoclaved Aerated Concrete
By:
Allison Carlisle
MEEN-3344
What is it?
• Autoclaved aerated concrete(ACC) is a porous, lightweight,
concrete-like material made with many small aggregates.
• AAC is 80% air. It can weigh about 1/6 to 1/3 as much as
normal concrete and can be just as strong with reinforcement
and a protective finish.
• Where? How long in use?
How it’s Made
• Raw materials such as limestone, water, sand, and often fly ash are
mixed with cement.
• A reactive expansion agent such as aluminum powder is added to
create air bubbles and cause expansion.
• The mixture is poured in large molds with
• After it sets, it is wire cut into precisely sized blocks and then baked.
• Reinforcement is placed within the molds prior to the curing.
• It is then baked to speed up the curing process and help maintain
their dimensions.
How it’s Made
Properties
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Density: 20-50 lbs. per cubic ft.
Compressive strength: 300-900 psi
Allowable Shear stress: 8-22 psi
Thermal resistance: 0.8-1.25 in. of thickness
Uses
• AAC combines insulation and structural capability for floors
and roofs.
• Its light weight properties make it easy to cut, size, and adjust
for complex jobs
• It’s a cement-based material, so it can resist water, mold,
insects, and is mostly fire resistant.
limitations
• Made in rigid, pre-sized panels
• Because it has a lower strength in most load-bearing
applications, it is typically reinforced.
• Also requires a protective finish since it is a porous material
and would deteriorate if left exposed. (usually a stucco-type
finish)
• Not readily available in America but can be easily shipped
Applications and cost
• Commonly used in everyday buildings such as commercial and
residential places.
• Also can be used for thermal insulation, plumbing and
electrical conduits. Ensures structural integrity and tightness.
• Cost can be expensive varying from the size needed and
distance that it has to be shipped
Summary
• It’s a light weight
• It is versatile and durable.
• Easy to adjust and size if mistakes or changes
are made
• Great for complex, and smaller jobs such as
plumbing areas.
Bibliography
• Jardine, Kathleen, Cameron,James, Sungarden Houses, Inc., Web, 2012,
www.sungardenhouses.com
• Lionheart Publishing, Inc., Using Autoclaved Aerated concrete Correctly,
Mason Contractors Association of America, Web, 2008,
masonarymagazine.com
• Portland Cement Association, Autoclaved Aerated Concrete, Web, 2012,
http://www.cement.org/homes/ch_bs_autoclaved.asp
• http://www.lightconcrete.com/images/LightConcrete.pdf