[Material selection knowledge] Daquan

As a high-grade building decoration material, stone is widely used in indoor and outdoor decoration design, curtain wall decoration and public facilities construction. At present, the common stones in the market are mainly divided into natural stones and artificial stones. Natural stone is divided into slate and granite according to physical and chemical characteristics. Artificial stone is divided into terrazzo and synthetic stone according to the process. Terrazzo is made by forging of cement, concrete and other raw materials; synthetic stone is made of crushed stone of natural stone as raw material, plus a binder, etc., which is pressed and polished. The latter two are made by hand, so the strength is not as high as that of natural stone. So, what are the decorative stones for exterior walls ? The following is an introduction to all types of decorative stone materials for external walls for your reference.

Encyclopedia of decorative stone types

1. Marble

Marble material is metamorphic rock formed by the original rock in the earth's crust through the action of high temperature and high pressure in the earth's crust. The internal force of the earth's crust promotes the qualitative changes of the original types of rocks, that is, the structure, structure and mineral composition of the original rocks. New rocks formed after qualitative transformation are called metamorphic rocks.

The marble material is mainly composed of calcite, limestone, serpentine and dolomite. The main component is calcium carbonate, which accounts for more than 50%. Because marble generally contains impurities, and calcium carbonate is affected by carbon dioxide, carbides, and moisture in the atmosphere, it is also easily weathered and corroded, and the surface quickly loses its luster. Marble is generally soft in nature, which is relative to granite.

The overall grinding, polishing, and crystallization treatment of marble materials is internationally known as marble. With its natural and simple texture, the color is bright and bright, and it is widely used in building interior walls. Due to the looseness of marble materials, the texture is soft and the water absorption rate Relatively high. There are many joint lines, so during the processing, transportation, installation and use, various kinds of pollution, warpage, deformation, and loss of light are likely to occur, which affects the decorative effect. Therefore, the care of marble is also a required course in the nursing industry. To compare and analyze the condition of marble finishes, the methods of care can be divided into:

First of all, make waterproofing before refurbishing and polishing, the purpose is to make the stone absorb as little water as possible, so as to reduce the water absorption law of the stone, and then make waterproofing after 300 #. At that time, the grinding effect will reduce or disappear the waterproof effect. Conditions permitting In this case, it is better to do waterproofing again after 800 #.

When encountering relatively loose stone materials, such as white sand beige, sandstone, tropical rain forest, wood stone, etc., high content sealing curing agent (such as super-hard inorganic coating, content of more than 40% silicone resin sealing agent) should be used as pre-treatment. It makes the stone harden the material while filling the looseness.

The composition and structural characteristics of marble make it have the following properties:

(1) Excellent decorative performance, marble does not contain radiation and is beautiful in color and rich in color. It is widely used for decoration of indoor walls and floors.

(2) Has excellent processing performance: sawing, cutting, polishing, drilling, carving, etc.

(3) The abrasion resistance of marble is good, not easy to aging, and its service life is generally about 50-80 years.

(4) In industry, marble is widely used. Such as: used for raw materials, purification agents, metallurgical solvents, etc.

(5) Marble has the characteristics of non-conductivity, non-magnetic conductivity, and stable field position.

2. Granite

1. Formation: Granite is formed by spouting and cooling crystallization of underground magma and granitic metamorphic rock.

2. Composition: The main component of granite is silica, and its content is about 65% -85%.

3. Chemical properties: The chemical properties of granite are weakly acidic.

4. Structure; The structure of granite is usually a point-like structure, the particles are relatively coarse (referring to silica), the surface pattern is distributed regularly, and the hardness is high.

5. Due to the special conditions and firm structural features of granite formation.

It has the following unique properties:

(1) It has good decorative performance and can be applied to public places and outdoor decoration.

(2) Has excellent processing performance: sawing, cutting, polishing, drilling, carving, etc. The processing precision can reach 0.5μm or less, and the luminosity can reach more than 100 degrees.

(3) Good wear resistance, 5-10 times higher than cast iron.

(4) The coefficient of thermal expansion is small, and it is not easy to deform. It is similar to indium steel and is minimally affected by temperature.

(5) The modulus of elasticity is large and higher than that of cast iron.

(6) Good rigidity, large internal damping coefficient, 15 times larger than steel. Can be shock-proof and shock-absorbing.

(7) Granite is brittle, and only partially falls off after damage, without affecting the overall straightness.

(8) Granite has stable chemical properties, is not easy to be weathered, and is resistant to acid, alkali and corrosive gases. Its chemical property is proportional to the content of silica, and its service life can reach about 200 years.

(9) Granite has many excellent properties such as non-conductivity, non-magnetic conductivity, stable field position and so on.

3. Sand and gravel

1. Formation: Sandstone, also known as gritstone, is a type of sand and cement (siliceous material, calcium carbonate, clay, iron oxide, calcium sulfate, etc.) that are formed by compression and adhesion under long-term huge pressure. Sedimentary rock.

2. Composition: The main component is sand content (silica) content above 65%, cement.

3. Properties: weakly acidic.

4. Structure: The particles of sand and gravel are uniform, the texture is fine, the structure is loose, so the water absorption rate is high (the cost of protection is higher), with sound insulation, moisture absorption, resistance to breakage, weathering resistance, fading resistance, insolubilization in water, no Features such as radioactivity.

5. Sandstone can't be polished, it belongs to matt type stone, so it reveals natural form and contains rich cultural connotation. Sandstone shows elegant, warm and luxurious atmosphere in the decoration. According to the characteristics of this kind of stone, it is often used for indoor and outdoor wall decoration, furniture, sculpture art, and garden construction materials. .

6. The hardness of sandstone is inherently related to its cause. Some high-quality sandstones have a very compact structure and their hardness even exceeds that of granite. In terms of durability, sandstone is comparable to marble and granite. Many buildings built with sandstone one hundred or two hundred years ago still have the same style and charm.

Editor's summary: Relevant information on the complete list of decorative stone types for exterior walls is introduced here for everyone. If you still do n’t understand something, you can leave a comment below, we will answer it as soon as possible.

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