Calcium silicate bricks are also called sand lime
or flint lime bricks depending on their ingredients. Rather than being made with
clay they are made with lime binding the silicate material. The raw materials
for calcium-silicate bricks include lime mixed in a proportion of about 1 to 10
with sand, quartz, crushed flint or crushed siliceous rock together with
mineral colourants. The materials are mixed and left until the lime is
completely hydrated; the mixture is then pressed into moulds and cured in an
autoclave for three to fourteen hours to speed the chemical hardening.
The
finished bricks are very accurate and uniform, although the sharp rises need
careful handling to avoid damage to brick and bricklayer. The bricks can be
made in a variety of colors; white, black, buff and grey-blues are common and
pastel shades can be achieved. This type of brick is common in Sweden,
especially in houses built or renovated in the 1970s, where it is known as
"Mexitegel" (en: Mexi[can] Bricks). In India these are known as
, manufactured using the FaL-G (fly ash, lime and gypsum) process.
Calcium-silicate bricks are also manufactured in Canada and the United States,
and meet the criteria set forth in ASTM C73 – 10 Standard Specification for
Calcium Silicate Brick (
). It has lower embodied energy than
cement based man-made stone and clay brick.
Zhengzhou Bona Enterprise Co., Ltd
Tel: 0086-371-87091886
Fax: 0086-371-87091887
Skype:Anneli9696
Email:anneli.bona@gmail.com
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