Brick: silicate or ceramic?

By Admin | Building Materials
14 May 2016

for professional builders, this question may seem somewhat naive, but for developers who want everything carefully "weigh" and understand all the nuances of building materials, it is very important.Especially since the market is flooded advisers dilettante.

first the origin of the materials.The raw material for silica brick are quartz sand, ground quick lime and additives, including colorings.The basis of the pottery is clay.The history of ceramic bricks more than one millennium and silicate analogue - a little more than a hundred years.The method of its manufacture was patented in 1880, W. Michaelis, after the invention in 1879 Charles Chamberland autoclave steaming under pressure.

thus obtained silica brick resulting autoclaved blanks (manufactured dry pressing) under a pressure of 8-15 atmospheres and at t = 175-200 ° C.Brick, after plastic molding, multi-pass lengthy roasting in the ovens, when t = 870-1200 ° C.Clay raw materials before mixing, thoroughly cleaned and crushed.The full cycle of manu

facture of ceramic bricks - more than a week, and silicate brick can be done in just a day.

From the above it is clear that for the production of ceramic bricks will require much more time and energy, and therefore expensive equipment.Its higher price (about 30-50%) is justified.However, when we compare the technical and operational qualities of the two materials, you will find that the price "prize" of silica brick will go by the wayside.

Ceramic brick

and ceramic and calcium silicate bricks can be both full-bodied, and hollow, ordinary (construction) and facial.However, when it comes to the construction of walls, application of silica brick is very limited: it is not permitted, in accordance with SNIP 11-22-81, for the construction of such elements as the foundations of buildings, basements, ground floor and the wall areas with wet mode.Also unacceptable silicate bricks for furnaces, fireplaces and chimneys (hydrous decompose already at t = 800 ° C), for their masonry and facing only used corpulent ceramic brick.

first ban is associated with high natural humidity (16-18%) of silica brick and its high water absorption (average 10% in the full-bodied and 13% in the hollow).Water absorption of the conventional ceramic brick is 6-13%, and some of its species, such as clinker, characterized by minimum water absorption of 2-3%.From water absorption and frost resistance depends bricks (how many cycles of freezing and thawing will sustain the strength of the material unchanged).

way, the fundamental factor for the Russian North-West, where the climate is characterized by frequent alternating irregular temperatures.And depending on the hardiness and durability, such as the facade of masonry home.And the higher the ratio, the longer it will serve as a face brick.Frost silicate bricks is 25-35 cycles (rarely increased frost F50), whereas the ceramic bricks, the figure is 50, while the clinker product 100 cycles.It happens that the producers (in advertising) overstate the main indicators of its products, in the hope that consumers are unlikely to check them for documentation.

from water absorption cladding material dependent and its insulating properties.So, when wet walls, for example, from an ordinary rain, which is not uncommon in Russia, heat-shielding properties of silica brick decrease significantly.Therefore, this material is characterized by unstable thermal insulation properties.The thermal conductivity of dry sand-lime brick (0.4-0.7 W \ M * K), but in the real world it is very high (0,56-0,95 W \ M * K) as compared to the veneering ceramic (0.34-0.57 W \ M * K), hence, the heat will be kept longer in the house lined with ceramic bricks.Enlarge the insulating properties of brick may be reducing its density, that is emptiness.

lime brick, for the most part, produced full-bodied, a density of 1800-1900 kg \ m3, although a number of companies have mastered its production-shirts technological holes (15-30%), a density of 1500-1550 kg \ m3.Hollow ceramic bricks (produced with voiding of 40-55% and a density of 1150-1200 kg \ m3. Naturally, the load and costs of the foundation will be greater in the case of silica bricks for lining the exterior wall. In addition, from the viewpoint of ecology housing ceramicsis preferable as it is breathable material. Water vapor permeability of ceramic bricks is about 0.16 mg \ m * h * Pa, and at Brick silicate only 0.05 mg \ m * h * Pa. With these values ​​in many vapor permeability wall "pie"require an air gap, which would entail an increase in the width of the foundation and will require highly skilled workers.

ceramic tile, brick, in contrast, is more and the ability to dry quickly after rain, so he is not afraid of no rot or mold. The index of airborne sound insulation for wetbrick is 50-51 dB, while the ceramic it is somewhat lower - 45-46 dB, which corresponds to the requirements of sound insulation SNIP 23-03-2003 "Protection against noise".

lime brick

One of the most important characteristics of a facing material - its strength and durability.Ceramic bricks differs most high strength and resistance to adverse surprising, including aggressive environmental influences, as compared to silicate brick.The same can be said about fire safety and fire resistance.Lime brick has low heat resistance (destroyed), and its rate of fire resistance is 2-3 hours.Ceramic brick is able to resist the spread of fire for 4-6 hours.

now about the range: brick silicate produced single (250h120h65 mm) and thickened (250h120h180 mm) in size and unpainted (gray-white) or dyed (10 shades) form, with a smooth matte finish.There is a stone size (250h120h138 mm).Brick, in addition to single and one and a half, and produced double evrorazmera.With regard to the variety and decorative qualities, offers modern versions of ceramic bricks market, their abundance is that the inexperienced buyer simply "dizzy"!Especially if you look at the richness of colors and textures collection of hand molding of bricks.It is important that the ceramic colors distinguishes natural origin, obtained by mixing different kinds of clays and technological secrets, known only masters of roasting.

All variety of the layering ceramic (facing bricks European and Russian manufacturers) you can see and buy the company "Slavda."

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