Brief introduction of clay brick characteristics

Clay bricks are made of clay (including shale, coal gangue and other powders) as the main raw material, and processed by mud, shaped, dried and roasted.
 
During the Spring and Autumn and Warring States Periods, China successively created square and elongated bricks. The technology and production scale, quality, and fancy varieties of brick making in the Qin and Han Dynasties have developed significantly.
 
Clay bricks are made from local materials, are cheap, durable, and have the advantages of fire resistance, heat insulation, sound insulation, and moisture absorption. They are widely used in civil engineering. Waste broken bricks can also be used as aggregates for concrete. In order to improve the shortcomings of ordinary clay bricks, such as small, self-heavy, and large soil consumption, it is developing in the direction of light weight, high strength, hollow and large blocks. Lime-sand bricks are made of lime and quartz sand, sand or fine sandstone in an appropriate proportion, ground, mixed with water, semi-dry pressed, and cured by autoclaving. Fly ash bricks are made of fly ash as the main raw material, mixed with coal gangue powder or clay and other cementing materials. They are made by batching, molding, drying and firing, which can make full use of industrial waste residues and save fuel.


 
China's clay bricks generally have an Al2O3 content of more than 40%, and an Fe2O3 content of less than 2.0 to 2.5%. The clinker in the ingredients is 65-85%, and the combined clay is 35-15%. The comminuted combined clay and the ground clinker are mixed and ground together, and then mixed with the granulated clinker to form a semi-dry mud, which is formed under high pressure and fired at about 1400 ° C. The performance is better. Clay bricks are weakly acidic at high temperatures, and their resistance to alkaline slag erosion is slightly worse, but they increase with increasing Al2O3 content. Thermal stability is better than silicon brick, magnesium brick (see magnesia brick), etc.
 
Qualified blast furnace clay bricks are dried and treated with vacuum phosphoric acid impregnation and phosphoric acid impregnation products fired at low temperature for the second time.
 
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