Advantages of castable in refractory material

General portland cement concrete can not withstand high temperature operating conditions, precipitation of calcium hydroxide in the hydration process, it becomes calcium oxide at high temperatures; As aggregate of limestone under high temperature thermal decomposition, strength destroyed.strength destroyed.

Ordinary concrete can only be used below 300 ℃ low temperature parts of the foundation and chimney stove. The castable temperature up to 900 ℃ or more.

Compared with other refractory castable has some distinctive features:

(1)Castable has almost same refractoriness with the firebrick, but because castable without sintering, the larger contraction when heated first time, so the load is slightly lower than the softening point firebrick. Nevertheless, a measure of overall performance is better than firebrick.

(2) As the effect of low temperature cementation materials, castable has high temperature compressive strength. and because masonry's good integrity, furnace air tightness, not easily deformed, outside the furnace shell plate can be canceled, stoves resistance to mechanical vibration and shock performance is better than brick masonry. For example, the upper sidewall of soaking furnace, where mechanical abrasion and impact are more severe, life expectancy increased by several times than brick.

(3)Good thermal stability, most or all of the aggregate are clinker,;expansion and contraction of cementing material phase offset,

Relatively speaking,the thermal expansion of masonry is smaller than a brick, thermal stress is also small. And there are a variety of mesh, needle and chain crystalline phase structures, a strong resistance to temperature.For example, to pouring soaking furnace mouth and lid. Life expectancy to a year and a half.

(4)The production process is simple, eliminating the complex steps of brick making. Castable can be made into a variety of prefabricated blocks, and to mechanized construction, brickwork greatly accelerate the speed and improve the efficiency of more than ten times higher than bricklaying. Waste bricks can also use as aggregate, waste for profit.