The main problems of calcium silicate bricks problems: Complexity and falling out of shape, cracking, boiling and half-baked, dark color, porosity, aloe and saltiness. Complexity: The complexity and falling out of the shape of the brick, i.e. out of its shape from a rectangular cube due to the large amount of clay in the soil of the brick, and to prevent it, the soil of the brick was tested and modified if necessary. Cracked: There are various reasons for brick cracking, the main of which is the presence of siliceous or silicate sand in the brick soil and a lot of clay in it. boiling: Boiling of bricks is due to the presence of lavage materials such as alkaline oxides in the soil. The disproportion of the heat distribution of the furnace in different parts of the brick causes some bricks to boil and others to break in half. Darkness: The presence of iron sulfur (FeS2) or pyrite causes the bricks to become dark and black. pocky: Cracking of the brick is due to the presence of organic materials and carbonates in the soil of the brick, too much water in the clay and its lack of density. 
Aloek: The presence of calcium carbonate or limestone in the form of grains in the soil of bricks causes the formation of clay in the brick, because the limestone is alive after baking and it blooms when it comes into contact with rain water and its volume is 1.25. It increases up to 3.5 times, resulting in a change called alloec. To prevent this defect, the soil of the brick should be ground and the coarse grains of sand should be removed from it. In addition to this, the bricks used in the facade should be soaked in water before use to absorb water well, and there should be aluec in it and its defect will appear. Whiteness or dandruff: Safidak has different types of carbonate, sulfate, chloride and nitrate. White carbonate: This lime water combines with CO2 in the air, which causes the formation of white carbonate on the wall. The hardness of the mortar water causes the formation of calcium carbonate on the brick surface. Rainwater, which usually contains some CO2 and water, CaCO3, remains as scale on the surface of the brick facade. The way to prevent this type of scale is to completely wet the brick before using it, water it and prevent it from sucking the lime water in the mortar, not to use water in the mortar and finally sprinkling the surface of the newly constructed wall with water before raining. Sulfate bleach: This whiteness appears when the mortar used in the wall is plaster, or sulfated water is used in making the mortar, or the brick soil contains various sulfates. 
The rain water and underground water that seep into these brick works cause the sulfates to dissolve in themselves and remove them, and after evaporation, the dissolved sulfates are left in the form of white sulfate on the surface of the wall, and this process continues until then. Remove the existing sulfate completely. The way to prevent it is not to use sulfated bricks, gypsum mortars and sulfated water. White Chloride: As a result of using hydrochloric acid to clean carbonate white, this acid combines with calcium carbonate and forms calcium chloride, which remains as scale on the wall after the facade dries. Calcium brick is the smallest building unit that consists of silica, clay, lime, iron oxide and magnesium. There are different types of bricks in the construction industry, which are defined according to their quality. Standard bricks are 9 inches long, 4.5 inches wide, and 3 inches thick. Bricks are used specifically in masonry construction due to their aesthetic value, high compressive strength, fire protection and against the need. Calcium silicate ceramics have been tested as biological materials since 1990. They have been studied for their potential in the use of blood and because they are more active than other substances. This is attributed to the fact that they contain silicon (Si), which plays an essential role in the mechanisms of new bone formation. Calcium silicate-based cements have the property that when immersed in biological fluids, the formation of a calcium phosphate/apatite coating causes regeneration. 
calcium silicate bricks advantages and disadvantages
In this section, we try to share with you the advantages and disadvantages of using calcium salicylic bricks. The advantages of using calcium silicate brick are as follows: • Affordable •Hard and durable • Compressive strength is good enough for normal construction Different directions and sizes create different textures •Maintenance Very low maintenance is required •Demolition of brick structures is very easy, takes less time and is therefore economical Reusable and recyclable Very fire resistant 
In other words, if we want to talk about the use of calcium silicate brick, we should say that: the weight of the wall and as a result reducing the weight of the structure and skeleton and reducing the cost of the skeleton/ Very high speed of execution - 150 square meters per day with a team of 3 people and as a result of reducing the overhead cost and quick return of capital/ Reducing the thickness of the walls and thus creating more interior space/ Dry construction, removal of mortar, water, removal of construction debris and waste materials/very good insulation of sound, moisture and heat and as a result, high energy consumption/ Very high resistance to pressure and impact/absence of insect penetration and their accumulation High stability against fire/high stability against vibration, strong shocks and earthquakes/ A clean and dust-free process