Calcium aluminate cement is a cement with calcium mono aluminate or calcium aluminate as the main mineral component. It is made of natural bauxite or industrial alumina and calcium carbonate (limestone) in a certain proportion and is made by calcination or electric melting, and it is also made by melting bauxite and limestone. It achieves early strength development, withstands extreme temperatures, and offers resistance to sulfates, making it ideal for refractory applications, time-sensitive projects, and environments prone to high heat and sulfate exposure.
| Item/Grade | CA50 | CA70 | CA80 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| A600 | A700 | A900 | CA70 | CA70W | CA70S | CA71 | CA80 | CA80S | |||
| Chemical Composition | ω (SiO2) ≤/% | 7.8 | 7.5 | 5.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| ω (Al2O3)/% | 50.0 | 51.0 | 53.5 | 68.5-70.5 | 68.5-70.5 | 68.5-70.5 | 69.5-71.5 | 78.0-81.0 | 78.0-81.0 | ||
| ω (Fe2O3) ≤/% | 2.5 | 2.5 | 2.5 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | ||
| ω (CaO)/% | / | / | / | 28.5-30.5 | 28.5-30.5 | 28.5-30.5 | 27.5-29.5 | 17.5-20.5 | 17.5-20.5 | ||
| ω (MgO) ≤/% | / | / | / | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | ||
| ω (R2O) ≤/% | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | ||
| ω (S) ≤/% | 0.1 | 0.1 | 0.1 | / | / | / | / | / | / | ||
| ω (Cl) ≤/% | 0.1 | 0.1 | 0.1 | / | / | / | / | / | / | ||
| Fineness | d50/μm | / | / | / | 11-4 | 8-11 | 6-9 | 10-13 | 5-8 | 5-8 | |
| -45μm ≤/% | / | / | / | 8.0 | 5.0 | 5.0 | 8.0 | 5.0 | 5.0 | ||
| Setting Time | Initial Setting Time (min) | ≥45 | ≥60 | ≥90 | 120-180 | 30-90 | 180-240 | 150-210 | 30-90 | 90-150 | |
| Final Setting Time (min) | ≤360 | ≤360 | ≤360 | 150-240 | 90-180 | 240-330 | 210-300 | 90-180 | 270-360 | ||
| Strength (ISO) | Flexural Strength/Mpa | 24h | 6.0 | 6.5 | 8.0 | 7.5-10.0 | 8.0-10.5 | 8.0-10.5 | 8.5-11.0 | 5.0-7.5 | 5.0-7.5 |
| 72h | 7.0 | 7.5 | 10.0 | 10.0-12.0 | 10.5-12.5 | 10.5-12.5 | 11.0-12.5 | 6.0-8.5 | 6.0-8.5 | ||
| Compressive Strength/Mpa | 24h | 45 | 55 | 72 | 40-50 | 45-55 | 45-55 | 50-60 | 30-40 | 30-40 | |
| 72h | 55 | 65 | 82 | 45-55 | 50-60 | 50-60 | 55-65 | 40-50 | 40-50 | ||
| 325M ≤/% | 15 | 12 | 8 | / | / | / | / | / | / | ||
| Specific Surface Areas ≥/ (㎡/kg) | 300 | 320 | 350 | / | / | / | / | / | / | ||
Calcium aluminate cement exhibits outstanding performance at high temperatures. It can withstand and maintain its strength and stability in extreme heat conditions, typically up to 1,500°C or higher. This makes it suitable for applications in industries such as steel, foundry, refractories, and high-temperature insulation.
Calcium aluminate cement has the characteristic of rapid hardening and early strength development. It can achieve initial strength quickly, allowing for faster construction or repair times. This is particularly beneficial in situations where time is of the essence, such as urgent repairs or projects with tight deadlines.
Refractoriness under load refers to the ability of a material to withstand high temperatures without significant deformation or loss of strength. Calcium aluminate cement has a high refractoriness under load, meaning it can maintain its structural integrity and strength even when subjected to high temperatures and mechanical stress. This property is valuable in applications where the cement is exposed to both heat and load, such as in kilns, furnaces, and industrial boilers.
Calcium aluminate cement demonstrates good resistance to erosion. It can withstand the erosive effects of chemical substances, abrasive materials, and turbulent flows. This erosion resistance makes it suitable for applications involving aggressive environments, such as chemical processing, wastewater treatment, and erosion-prone surfaces.
Calcium aluminate cement is widely used in high temperature environments because of its fire resistance. It is often used in the construction of refractory furnaces, high-temperature kilns, industrial furnaces and other places that need to withstand high temperature. In addition, calcium aluminate cement can also be used to make refractory materials such as refractory bricks and refractory castables to protect the internal structure of the furnace from high temperature corrosion.
Calcium aluminate cement is often used as one of the raw materials for refractory castables. This castable is usually used to repair and construct equipment and structures in high temperature environments, such as metallurgical furnaces, steel furnaces, glass furnaces, etc. Refractory castables can be applied plastically as required, allowing them to fill and coat surfaces of all shapes and sizes, providing a protective layer that is resistant to high temperatures and chemical attack.
In some cases, calcium aluminate cement can also be used directly for some special purposes. For example, in some high-temperature industrial fields, calcium aluminate cement can be directly applied to specific parts to achieve fire resistance.