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Why can’t Refractory Cement be Used to Lay Refractory Bricks?
In the process of laying refractory bricks, refractory mud is usually used for masonry, and refractory cement cannot be used for masonry. Although both are refractory materials, there are great differences in the actual application process.
Refractory mud, also known as fire mud or joint material, is a joint material specially used for refractory brick masonry. Refractory mud is composed of refractory powder and admixtures, and has good plasticity, convenient construction, high bonding strength, strong corrosion resistance, and high refractoriness.
Refractory cement, also known as aluminate cement or high alumina cement, is a necessary material for preparing refractory castables. In refractory castables, it is usually used for bonding between powders, and at the same time, it can harden the refractory castables.
Differences in adhesion and hardening methods between refractory mud and refractory cement. Refractory mud has good plasticity and adhesion, and can form a ceramic bond at high temperature, providing sufficient strength and stability. Refractory cement is different from refractory mud in adhesion, and its hardening method is also different from that of refractory mud. Refractory cement is usually a hydraulic cementitious material.
The construction methods between refractory mud and refractory cement are different. When laying refractory bricks, refractory mud is usually constructed by wet method to ensure close bonding between bricks. Refractory cement is usually used for on-site construction by prefabricated parts or on-site pouring.
There are differences in chemical properties. The performance of refractory mud at high temperatures, such as thermal stability and slag resistance, is more suitable as a joint material for masonry. Although refractory cement also has high temperature performance, its thermal expansion rate, thermal conductivity and other properties may not be suitable for direct use as a joint material for refractory bricks.
There are differences in use. The choice of refractory mud should match the use temperature of the use part. For example, high-alumina bricks are recommended to use high-alumina refractory mud, while clay bricks use clay refractory mud. The aluminum content in refractory cement is higher, and it is more used as a high-temperature adhesive to prepare refractory castables.
The above is why refractory cement cannot be used to build refractory bricks. Although refractory cement and refractory mud are both relatively high in aluminum content, the main reason is the difference in bonding and hardening methods, which leads to differences between the two during use.
Choose RS Kiln Refractory for Pure Calcium Aluminate Cement for High-Temperature Refractory Castables
Refractory cement is mainly used in high-temperature refractory castables, such as ladle castables and other amorphous products. RS manufacturer’s refractory cement is a high-grade calcium aluminate cement with an alumina content of about 80% and high-performance additives. It has a small amount of water added, but it shows high fluidity, high strength, and excellent construction performance. The stable chemical composition and mechanical properties help install the machine and improve its construction performance.
Chemical composition & specific surface area
Items
Chemical Composition（%）
Specific Surface Area
CaO
Al2O3
Fe2O3
SiO2
MgO
L.O.I
Blaine (cm2/g)
BET (m2/g)
Guaranteed Value
< 19
> 78
< 0.3
< 0.4
< 0.3
–
> 9,500
–
Typical Value
18.2
79
0.14
0.28
0.2
1.37
10,240
4.6
Particle size distribution
Particle Size Distribution
D10 (µm)
D50 (µm)
D90 (µm)
Typical Value
0.41
5.02
21.27
Bonding performance
Formula: Cement 1: ISO standard sand 2.7: water 0.32. Use EN196-1 test method.
RS Kiln Refractory Manufacturer uses high-quality raw materials under strict management to produce alumina cement with high heat resistance and workability. It is a cement manufacturer specializing in the supply of refractory cement CA 50, 70, and 80 to the domestic and overseas markets. Through research and innovation, it continues to launch products that exceed customer expectations in order to become a world-class company recognized by the world and provide long-life refractory lining materials for high-temperature industrial furnaces around the world. Through the development of innovative technology, Refractory Cement, which guarantees high levels of quality and stability, will become a must-have for refractory products.
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