Refractory concrete is a special kind of concrete. Compared with ordinary concrete, it has good thermal stability, simple manufacturing process and can adapt to a variety of harsh scenes, so it plays an important role in many production and life scenes. Then, let's learn some words and pictures about refractory concrete with Bian Xiao. We will introduce the brief introduction, advantages and classification of refractory concrete in detail.

Brief introduction of refractory concrete

Special concrete is made of appropriate cementing material, refractory aggregate, admixture and water in a certain proportion.

Under the long-term action of high temperature above 900℃, the required mechanical properties can be maintained. Its performance depends on the materials and proportions of all aggregates, admixtures and cementitious materials. Its material, composition and ingredients are similar to those of refractory castable.

Refractory aggregate can use heavy slag, broken firebrick, basalt, bauxite clinker, sintered magnesia, etc. According to the cementitious materials used, it can be divided into silicate cement refractory concrete, aluminate cement refractory concrete, sodium silicate refractory concrete, phosphate refractory concrete, magnesium refractory concrete and so on.

Granular materials and powdery materials in refractory concrete are called aggregate and admixture respectively. Concrete mixture can be formed by pouring, vibrating or ramming, and corresponding measures should be taken to promote the hardening of cementitious materials according to their hardening characteristics (such as gas hardness, hydraulic and thermal hardness). ).

It is mainly used for building the integral lining of industrial furnaces and making prefabricated blocks. Among them, the concrete used below 900℃ is called heat-resistant concrete, which is used for the foundation and chimney of industrial furnaces and thermal equipment.

Second, the classification of refractory concrete

Refractory aggregate, powder and cementitious materials are mixed with water or other liquids to make unshaped refractory materials, which can be used directly without calcination, also known as refractory castable. Divided into: ① ordinary refractory concrete. Aggregates used include high alumina, clay, silica and alkaline materials (magnesia, chromite, dolomite, etc.). ) or special materials (carbon, silicon carbide, zircon, etc. ), a combination of several refractory aggregates can also be used. (2) Thermal insulation refractory concrete. Mainly made of refractory lightweight aggregate. The lightweight aggregates used include expanded perlite, vermiculite, ceramsite, porous clay clinker, hollow alumina balls, etc. It can also be used in combination with several refractory lightweight aggregates or refractory aggregates. Cement used in refractory concrete includes high alumina cement, phosphate cement, sodium silicate cement, clay and so on.

Refractory concrete is a kind of unfired product with simple production process and energy saving. It can be shaped as required, and its integrity is better than that of brick lining, which is suitable for mechanized construction. When used reasonably, it can often prolong the life of the lining. Refractory concrete is mainly used in metallurgical, petroleum, chemical, building materials, machinery and other industrial kilns. Generally, the refractory concrete with the service temperature of1300 ~1600 c and the service temperature below 900°C is called heat-resistant concrete, which is mainly used for the foundation, chimney, flue and other structures of thermal equipment.

Third, the advantages of refractory concrete

1, the fire resistance is similar to that of refractory bricks of the same material, but the initial heating shrinkage is large due to non-sintering, and the softening point under load is slightly lower than that of refractory concrete (castable). Nevertheless, on the whole, the performance is better than that of refractory bricks.

2. Refractory concrete is superior to low-temperature cementing agent, and its compressive strength at room temperature is higher. At the same time, due to the good integrity of the masonry, good air tightness of the furnace and difficult deformation, the outer steel plate of the furnace shell can be eliminated, and the mechanical vibration and impact resistance of the furnace is better than that of the brick masonry. For example, if it is used in the upper part of the side wall of soaking pit with serious mechanical wear and collision, its service life is several times higher than that of brick.

3, good thermal stability, most or all of the aggregate is clinker, and the expansion is offset by the contraction of the cementing material, so the thermal expansion of the masonry is relatively smaller than that of the brick, and the temperature stress is also small, and there are various reticular, needle-like and chain-like crystal phases in the structure. Strong resistance to low temperature stress. Such as a furnace mouth and a cov used for pour soaking pits, and that service life is prolonged to one and a half year.

4. The production process is simple, and the complicated brick-making process is cancelled. Can be made into various prefabricated blocks, can be mechanically constructed, greatly accelerates the furnace building speed, and improves the bricklaying efficiency by more than ten times. You can also use waste bricks as aggregate to turn waste into treasure.

Above, we introduced the related information of refractory concrete in detail, mainly the introduction, advantages and classification of refractory concrete. Through introduction, we know that refractory concrete, as a special kind of concrete, is characterized by its high temperature resistance. In addition, it also has the advantages of high stability and simple production process. This also enables refractory concrete to meet the functional requirements of some special scenes.

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