Refractory Concrete, consisted of aggregate, binder and admixture is a kind of special concrete. This kind of refractory concrete is cheap and is easy to make complex shape of other products. Refractory concrete is commonly used for lining, furnace door,furnace wall and electric furnace. As one of the refractory concrete suppliers in the world, RS Refractory Materials Manufacturer has the ability to produce high quality refractory concrete to make customers satisfied. Any need of refractory concrete? Just Email RS!
Refractory Concrete Meaning
Refractory concrete is a special kind of concrete which is made of aggregate, cementing agent and admixture in a certain proportion and is formed by directly poured. Depending on the different cementing agents, the refractory concrete can be divided into aluminate refractory concrete, water glass refractory concrete, phosphate refractory concrete and aluminum sulfate refractory concrete. Refractory concrete is fire-resistant but the making process of refractory concrete is simple. Although the refractoriness and load softening start temperature are slightly lower than the refractory brick, refractory concrete has good burning process and good plasticity, making it easy to make the shape of complex products. The life service of refractory concrete is similar like refractory bricks, but the cost is low, so the use of refractory concrete is more and more widely.
High Heat Refractory Concrete
The melting point of refractory concrete is 900 degree celsius. Refractory concrete can maintain mechanical properties at a high temperature above 900 degree celsius for a long time. The properties of the refractory concrete depend on the materials and proportion of all aggregates, admixtures and cementitious materials. The material, composition and ingredients of refractory concrete are similar to those of castable refractory.
Refractory aggregate can be made of heavy slag, broken refractory brick, basalt, bauxite clinker, sintered magnesia and so on. According to the cementitious material used, it can be divided into Portland cement refractory concrete, aluminate cement refractory concrete, water glass refractory concrete, phosphate refractory concrete, magnesia refractory concrete and so on.
Refractory Concrete Application
Refractory concrete is used for furnace lining, furnace door, furnace wall and steel grove of electric furnace. Refractory concrete is mainly applied to build integral furnace lining and make precast blocks in industrial kilns.
Refractory concrete is a unburned product with simple production process and energy saving. Refractory concrete can be shaped according to the needs. The integrity of refractory concrete is better than brick lining, which is suitable for mechanized construction. Refractory concrete is mainly used in metallurgy, petroleum, chemical industry, building materials, machinery and other industrial kilns. General use temperature is 1300 ~ 1600 ° C.Use The refractory concrete can used in the foundation of thermal equipment, chimney and flue structure where the use temperature is below 900° C.
Refractory Concrete Types
Refractory concrete can be divided into:
Ordinary refractory concrete. The aggregates used are high alumina, clay, siliceous, alkaline materials (magnesia, chromite, dolomite, etc.) or special materials like carbon, silicon carbide, zircon, etc, and several refractory aggregates combinations can also be used.
Heat insulation refractory concrete. This refractory concrete is mainly made up of refractory lightweight aggregate. The light aggregates used is expanded perlite, vermiculite, ceramsite, porous clay clinker, hollow alumina ball and so on. They can also be combined with several refractory lightweight aggregates or with refractory aggregates. The cementing materials for refractory concrete include high alumina cement, phosphate cement, glass cement, clay, etc.
Refractory Concrete Advantages
- The refractoriness of refractory concretes is similar to that of refractory brick of the same material. But as the refractory concrete (castable) is not sintered, the shrinkage is large at the first heating and the softening point of the load is slightly lower than that of the refractory brick. In general, the overall performance is better than that of refractory bricks.
- Refractory concrete is superior to low temperature cementing agent, and has higher compressive strength at room temperature. At the same time, because of the good masonry integrity, the gas tightness of the furnace is good, it is not easy to deform, the outer shell plate can be cancelled, and the performance of the furnace against mechanical vibration and impact is better than that of the brick masonry. For example, the side wall of the soaking furnace, where the mechanical wear and collision are severe, has longer life service than brick.
- The thermal stabilityof refractory concrete is good, most or all of the aggregate is clinker, and the expansion is counteracted by the shrinkage of the cemented.Therefore the thermal expansion of the masonry is smaller than the brick, and the temperature stress is also small. And there are all kinds of net like, needle like and chain crystalline phases in the structure. The ability to resist low temperature stress is strong. For example, it is used for pouring the furnace top and the lid of the soaking pit, and the service life is extended to a year and a half.
- The production process of refractory concrete is simple. Refractory concretecan be made into various kinds of precast blocks and mechanized construction, which greatly speeds up the construction of the furnace, and improves the efficiency of bricklaying by more than 10 times. We can also use waste bricks as aggregate and turn waste into profit.
Refractory Concrete Mix
There are two ways to determine the ratio of refractory concrete mix: first, according to the requirements of the raw materials given by the design drawings or design notice, the construction can be met by the trial mix to meet the requirements of construction and ease of use. The second is that only the types of refractory concrete and their technical requirements are presented in the design drawings, which can be determined by the construction unit in accordance with the relevant national regulations and standards in accordance with the following procedures.
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Briefly, refractory concrete mix are two steps. Firstly, the test department proposes to use the matching ratio and the raw material technical requirements, and after sampling the test to meet the design requirements, the test department shall propose the material matching ratio to the supply department, so as to purchase various raw materials with this matching ratio. Secondly, the construction mix proportion is formulated by the material testing department, and the construction is carried out according to this mix proportion if it can meet the requirements of construction and workability.
Where To Buy Refractory Concrete
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Refractory Concrete Suppliers
There are a large amount of refractory concrete suppliers in this world. Among these refractory concrete suppliers, RS refractory supplier is a professional one with the ability to produce qualified refractory concrete with good performance and thermal stability. Welcome you to buy refractory concrete from RS Refractory Materials Company! Interested? Contact RS for price list!