Refractory Bricks

What are the differences between high-aluminum castables and low-cement castables?

Nov 03,2020

Both low-cement castables and high-aluminum castables are refractory materials commonly used in construction, so what is the difference between similar names?

First of all, compared with high-aluminum and low-cement castables, although both have good volume stability at high temperatures, they are dried and calcined during the construction process to reduce the body of the low-cement castable. The secret will not shrink. The difference between the two castables is that low-cement castables use ultra-fine powder, which reduces the amount of cement, has high bulk density, low porosity, and improved service life. The strength of high-aluminum castables after medium and high temperature treatments will not decrease, and the corrosion resistance is still very strong, mainly because the materials used make it have excellent hardness indicators. High-alumina castable is a kind of castable with a higher cement content than low-cement castables, and has a higher calcium content than low-cement castables.

How to choose it in construction? Generally, it depends on the furnace type, temperature, and use environment. With specific use conditions, you can clearly choose whether to use low cement castable or high aluminum castable. Of course, the price of high-aluminum castables and low-cement castables will also be different. Under normal circumstances, the quality of raw materials used for high-alumina castables is relatively low, while low-cement castables are adjusted by pure calcium aluminate cement. The amount of cement and the quality of raw materials used are also relatively high.

In construction, whether it is high-aluminum castable or low-cement castable, the amount of water added is generally 6%, while low-cement castables have low compactness and porosity. The low porosity increases the difficulty of baking. Pouring, curing, and baking the pouring material can achieve better results.

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