History
and
Process
AAC
was developed over
75years ago in Sweden
and is now being produced
in more than 420 factories
around the world. It
is made from fine ground
silica sand, portland
cement, lime, water and
aluminum powder as an
expansion agent. The
production process is
very carefully monitored
to insure a controlled
consistency in the proportions
and timing of all ingredients
that are used in each
batch. The materials
are first mixed into
a slurry and then poured
into large molds where
the expansion agent reacts
with the alkalis in the
cement and lime to produce
millions of small hydrogen
gas bubbles. The mix
expands and rises almost
2 times its initial volume.
The hydrogen evaporates
and the 'cake' sets up
and hardens into a stable
closed cell matrix which
can then be precision
wire-cut into blocks
or panels. The green
aerated concrete is then
steam cured in a pressurized
autoclave for about 12-14
hours where upon it undergoes
a second chemical reaction
and transforms into the
mineral Tobermorite or
calcium silicate. The
finished materials are
palletized and
delivered by truck directly to
the job site.
AAC
home construction in Germany
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higher resolution enlargement, click
here
AAC Manufacturing
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