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Gypsum is a building material that is obtained from gypsum found in nature . Gypsum is found in the form of hydrous calcium sulfate in surface resources And after being crushed and transferred to the furnace in the form of very fine white powders, it is used for construction purposes. this type of material is used in various industries But among its common applications is related to the construction industry.The work with these construction materials has its own complexity and detail Hence , it requires special skill and tricks to use it . This material is used to cover different surfaces and decorate them and for having a white color , it gives a bright , bright look to space . It 's important to follow a set of points when using chalk .
If the principles of plastering are not observed, the desired surface will crack and making an unpleasant appearance. Working with this material is not easy.
When the plaster is taken out of the kiln, it is transferred to the mill And comes in powder form. The smaller the particle size, the higher the quality of the odor and it 's more suitable for delicate gypsum . Gypsum is sold in powder form in bulk in the market. It tends to mix with water,Therefore, it easily absorbs water and moisture And if not used, it will rot. the sheet of gypsum should be kept in an environment far away from the moisture So that they can be stored for longer. It reacts rapidly with water and hardens so working with it requires great care . The taking time of the high quality sample of this product should not be less than 8 minutes and not more than 25 minutes.
1.It 's a very light matter. And therefore , the use of it does not import any additional burdens on the building .
2.Using it can somehow cause sound and heat insulation .
3.The ductility of gypsum is high and it can be found in different ways .
4.If it gets dirty, it is not easy to clean it .
5.The biggest drawback of this product is the absorption of moisture and drumming due to it. Applying this substance on metal surfaces causes it to combine with metals and produce sulfate As a result, the life of the desired part is reduced. Therefore, before covering iron, copper and lead surfaces with plaster, a stainless layer should be placed on them.
6.The resistance of the material was high in the fire And is a slow-burning material.
1.White Chalk :
This plaster is used for whitewashing in the building. White plaster is used as a surface compared with other types of plaster , there is a lower price .
2.Gipton plaster :
This type of plaster is obtained by combining gypsum with sticky additives such as silk And is applied in two layers on bricks, porous concrete surfaces, cement surfaces, cement blocks and concrete blocks.
3.Ivory plaster :
Ivory gypsum has a very soft and micronized granulation It is used in sculpture, making prefabricated gypsum parts, producing enamel paint and killing the building.
4.Marble plaster :
Marble gypsum is a type of gypsum without molecular water that is mixed with a solution and then re-baked. This plaster has a high resistance to moisture.
5.Satin plaster :
Satin plaster is used to whiten the final layer of surfaces To prepare this material, gypsum is mixed with additives such as perlite.
6.Gypsum Siwa :
This type of plaster is used on a variety of different surfaces . Siva gypsum is very suitable for performing finishing operations . On the surfaces that are covered with Siwa plaster, you can use a variety of oil paints, acrylic coatings, PVC wall coverings, satin polymer plaster and Belka.
to use this product at first , it should be mixed with water to put the chalk in a container and add it to the water . The ratio of the chalk to the water used should be proportional to. Once it gets its initial grip, it can be applied to the desired surface with the help of a trowel . The movement of the trowel should be diagonal to the wall Because only the side line of the trowel can create a smooth and even surface.
The thickness of the surface can be measured as desired by the implementation of this method . A mixture of plaster and water is often used to whitewash the building and cover it and the soil Because it creates a white surface, but to produce gypsum mortar, clay is mixed with water.
gypsum and soil to produce this mortar are used equally But depending on whether it is quick or quick, clay can be used more or less.
This material creates heat when combined with water . This heat is 20 degrees warmer than the desired environment. thus , mortar mortar can be used at low temperatures . The quickness of this product has caused the mortar to be prepared only as much as consumed Because the whole wall dries and hardens before finishing work and whitewashing. Gypsum increases in volume in case of clogging and creates a uniform surface by filling holes and pores.
As mentioned, this material is quick-setting, but to slow it down, you can increase the amount of water and knead the mortar. The mortar obtained from this method is called killed plaster.
Killed plaster is mainly used for whitewashing walls. Killed gypsum mortar does not lose its elasticity before drying.
Quickness and volume increase are among the prominent features of this material that have made this material a widely used material in the construction industry.
If the amount of gypsum mixed with water is less than the specified limit during the production of gypsum mortar, after drying, the volume of data decreases, resulting in a cracked surface.
If the thickness of the plaster applied to the wall is more than 8 cm, the top layer dries, while the bottom layers have not yet dried.
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