The matrix and the firmness of the AAC products are made due to autoclaving.
It is possible to form
foamed or aerated concrete without autoclaving but the properties are going to
be very bad. Of course, such products will contain mostly cement.
The mechanical strength
will not be very high and through the drying, the shrinkage is going to be
excessive.
Technically, such a product
will start cracking by itself when it approaches equilibrium moisture content
after a couple of years.
In the case of ordinary
concrete products, there are no shrinkage troubles during the drying operation.
But in foamed or aerated concrete the mixture is air and if manufactured
without autoclaving, drying shrinkage will cause cracking.
The calcium silicate
hydrates formed during autoclaving is more stable than the one formed of cement
at room temperature.
Autoclaved products have
low shrinkage.
Cement will need four
weeks to achieve its final strength at room temperature whereas, autoclaving
takes only 12 hours. to get desired strength.
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