The autoclave method
of curing concrete masonry At Boehmers, freshly molded block are loaded into the autoclave
kiln for processing. The kiln is sealed and steam pressure of
more than 120 psi (827 kpa) is applied at 100% humidity. After
curing at 350°F (170°C), the steam pressure is released creating
a vacuum that returns the block to an air-dry condition. The
block is now harder and more stable than block produced using
other curing methods. It is preshrunk with a relative moisture
content of less than 1%. Fully cured block are less likely to
chip or crack during shipping and handling.
Moisture Control
The structure of an autoclave cured block is less affected by
changes in the weather assuring a more dimensionally stable
finished wall. Autoclaved units meet the "M" Class in the fourth
facet of C.S.A.
Less Efflorescence
The autoclave process eliminates efflorescence that may form on
block surfaces. These deposits are formed from dissolved salts
and free lime that leach from inside the block. The autoclave
process converts these active soluble materials into stable
inert compounds leaving the block surface attractive and
comparatively stain-free.
Lighter Colour, More Uniform Texture
Concrete units manufactured by Boehmers using the autoclaved
process are lighter and more uniform in colour through the
naturally cured concrete. The lighter colour produces a more
attractive finish when left exposed. In applications specifying
a painted surface, the more uniform texture requires fewer coats
of sealer and paint.
