Pros and cons of the construction of the sand-lime brick
of the most common building materials (excluding polymers) silica brick is one of the youngest.Its technology was developed in the late 19th century, but the mass production and use began in the middle of the last century.Tell me more, what a sand-lime brick, the pros and cons of this building material.
- What is sand-lime brick, and what are its features production
- Stamps and types of silicate brick
- Pros silicate brick
- Cons silicate brick
- Video:lime brick its pros and cons
What is sand-lime brick, and what are its features production
Before we consider in detail the advantages and disadvantages of silica brick, you must understand what the material in terms of technology.Lime brick is almost similar to the natural limestone material that has been used for thousands of years.But, as is clear, almost always natural stone (including those due to the cost of shipping) is much more expensive than synthetic.
of plaster, from which production takes place sand-lime brick, before the invention of Portland cement was the most common masonry materials, but it has a huge drawback - it is not water resistance.Then, after a few years it becomes resistant to the water, but these terms are much longer than the standard is now concrete.
experiments with long-known mixture of lime and sand began almost simultaneously Russian civil engineer proho and Swede Ridina, they tried to industrially make the walls and even the whole house just because it is clear the high quality achieved was impossible (especially been widely used concrete on the basis ofPortland cement).Several more advanced German physician (not a builder !!!) Bernardi, he was producing molded bricks, which are then hardened in the air.But of course a decent water resistance of finished products have not been.Compatriot doctor (also a doctor, but in the field of chemistry) Michaelis tried to process a mixture of lime and sand steam under pressure.And there was a sand-lime brick.October 5, 1880 can be considered as the date of his birth.Moreover, his invention was not based on calculations (like almost all the scientific advances of the time, to take at least a biography of Thomas Alva Edison created the light bulb, the phonograph, and so on. F.), And the result of trial and error.
New material gained popularity.Even in the Russian Empire at the beginning of the last century, it worked for nine plant produces silicate.But now widespread this material accounts for 50 years (this is well illustrated by the date of construction of buildings from a white brick).
production of silica brick
silicate brick manufacturing process is simple enough (as opposed to the production of other construction materials), but it requires special equipment.Therefore silicate only released commercially in small shops its production unprofitable.
enumerate all the stages of manufacture of products:
1. Mixture - metered amount of sand and lime, if necessary, water.Enter the requested additives (to adjust the composition).The mixture is thoroughly mixed.
2. formation - part of the press.Moreover, unlike ceramic articles it often remains in the form until the last phase (it depends on the production line).
3. Autoclave - molded articles are sent in a sealed chamber for the treatment of "acute" steam.To explain - live steam has a temperature of more than the boiling point of water (100 degrees Celsius) because the pressure greater than atmospheric.
4. Brick unloaded form, and passes control of the output is sent to the consumer.
should also be noted also that the production of silica brick is very close to the production of Foam and silicate blocks.Therefore, plants often produce the entire range, and heat treatment lines use the same autoclave.
- See also: Pros and cons of the construction of silicate blocks
Stamps and types of silicate brick
On the basic characteristics such as density, and frost-lime brick is different from the more usual throughout the ceramic.The characteristics and properties of silicate bricks regulates GOST 379-79 "Brick and silicate rocks.Technical conditions".
It has the following main characteristics:
- brand strength - M125, M150;
- Mark on frost resistance - F15, F25, F35;
- thermal conductivity - 0,38-0,70 W / m ° C.
Frost - is the ability of the material present in water-saturated state alternately freezing and thawing without changing its characteristics.Measured frost cycles and referred to as "SSE".or "F".
strength - the ability of a material to resist internal resistance and deformations.Represented by the strength of the letter "M" and a certain number.The digital value which indicates the load per 1 cm 2 can withstand the brick.
solid and hollow bricks .But there already is a difference with ceramic bricks, which consists in that the voids in the silicate generally cylindrically shaped and positioned in the center of the array, the number of ceramics have more, they can be of different shapes and more evenly distributed throughout the product.Many companies also offer the production of bricks to the size of the customer (medium or large parties), this is due to the fact that it is often not formed extrusive press (which are difficult to readjust), and in individual forms.
Pros silicate brick
+ Low cost
It is due to the fact that using cheap raw materials such as lime and sand (although very high quality).Also for the production of the bricks, you can use a sharp pair of CHP is still cooled in cooling towers.With the release of conventional brick raw materials more expensive and require pre-exposure (as cognac, the clay must be a minimum of 3 winter lie in heaps) pre-crushing and drying of blanks.Energy consumption for the release of silicate is much less.Almost always silicate masonry cheaper than even the use of lightweight concrete has the same carrying capacity.
+ good environmental
This brick is more environmentally friendly, it does not contain any harmful ingredients.The level of radiation it generally differs minimum value of the background in comparison not only with natural and artificial, and construction materials.
+ High compatibility with the masonry mortar
Excellent compatibility with any masonry mortar from the traditional cement-lime to polymer-based adhesives.
+ good aesthetic properties
silicate brick has high aesthetic properties.The natural white color is easily changed by introducing pigments, coloring material in the entire volume, not only in the surface layers.
+ Excellent geometry
Each brick has the same geometry that facilitates the work on its installation.
+ High strength
strength of sand-lime brick ranges from 75 to 200 kg / cm2.
+ Good sound insulation
Because the material has a high specific strength, he has good sound-insulating properties.
+ High frost
Frost silica brick can reach up to 50 cycles of freeze-razmerzaniya that certainly for the better, affects the durability of the material.
But nevertheless the main advantage of silica brick - its low cost with excellent performance properties, and therefore it is so widespread.
Cons silicate brick
Of course, there is no ideal building material, so the list and disadvantages of silicate bricks:
- heavy material
He is heavier for ceramics and evenNatural limestone (by 30-15%).Requires foundation with greater load carrying capacity.Although in some cases, massive walls are also a plus.
- quickly collapses under constant exposure to water
Although it is not inferior frost ceramics, with constant exposure to water silicate begins to break down.Therefore, it is not used for caps.In addition, often in strong showers of sand-lime brick walls impregnated with water, so it increases the humidity indoors.
- High thermal conductivity
silicate (not even a full-bodied) has better thermal conductivity.Therefore, you should either increase the thickness of the walls, or additional insulation.
- not withstand high temperatures
Also, by contrast to the ceramic silicate can not withstand high temperatures.Therefore, chimneys, furnaces and even more so to use it, too, is impossible.He can unpredicted collapse from sudden heating and cooling or constant exposure to flame or flue gas.
- lack of flowing shapes and decorative elements
sale found only bricks rectangular shape with right angles.
- High water absorption
Water absorption of silica brick can reach up to 7 - 8%.What prevents the use of the material for the construction of the various elements which can be observed humidity.
Note: In my experience often see that in rural areas is often a silicate brick refractory alternative.Fire safety inspection of the course can not be determined.But it is necessary to warn against the use of such materials for furnaces.They can serve as good years.
- Any such furnace necessarily cracked (which sees through the smoke and flames in the worst case).This is due to the fact that it is impossible to provide a reliable laying on the silicate clay.They are almost an order of magnitude different coefficient of thermal expansion.
- Prolonged heating calcium silicate bricks can be destroyed almost instantly.To snatch the flame will serve as a source of fire.
Video: silicate brick of its pros and cons
- Despite the shortcomings, it is good stuff going to use
- Dosilica brick many shortcomings, I think to give preference to other material
- use this material for building and pleased with his performance
- use this material for the construction, but it does not justify the confidence
- reviews silicate brick
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