KERUI produces high-purity calcium aluminate cement through sintering process, with Al2O3 content of 70, 75 and 80%.
These products are not only widely used in the entire refractory industry, but also have high demand in other fields, such as building chemicals.
Product description of refractory cement CA80
As a high-purity product, CA80 contains about 80% aluminum oxide. The specific properties of CA80 endow high-performance concrete with the following properties, high fire resistance and excellent mechanical properties.
Therefore, it can be used for conventional and low cement castables in the refractory industry. These castables require rapid solidification, high early strength development and good strength at intermediate temperature. Moreover, the purity of CA80 is very high, making it suitable for some refractory applications. For example, in the presence of hydrogen or carbon monoxide reducing atmosphere, low silicon and iron oxide are essential.
The 80% alumina cements of KERUI are represented by two product types, CA80 and CA80S.
”CA80S has good fluidity, long workable time and low water demand, ideal to produce castables of good working ability and excellent mechanical strength property without any additives, also it suits very well to be used in high temperature environment or hot summer time.“
Notes: refractory cement = high alumina cement = Calcium aluminate cement
Parameters of refractory cement CA80
| Products | CA75 | CA75 | CA80 | CA80 | CA80S | CA80S |
| Workable time | Moderate | Moderate | Short | Short | Longer | Longer |
| Standard | Usual range | Specification limit | Usual range | Specification limit | Usual range | Specification limit |
| SiO2, % | 0.1-0.4 | ≤0.5 | 0.1-0.4 | ≤0.5 | 0.1-0.4 | ≤0.5 |
| Al2O3, % | 73.5-75.5 | ≥73 | 78.0-80.0 | ≥77 | 78.0-80.0 | ≥77 |
| Fe2O3, % | 0.1-0.4 | ≤0.5 | 0.1-0.4 | ≤0.5 | 0.1-0.4 | ≤0.5 |
| CaO, % | 21.0-23.0 | – | 18.5-20.5 | – | 18.5-20.5 | – |
| R2O, % | – | ≤0.4 | – | ≤0.4 | – | ≤0.4 |
| S-, % | – | ≤0.1 | – | ≤0.1 | – | ≤0.1 |
| CI-, % | – | ≤0.06 | – | ≤0.06 | – | ≤0.06 |
| d50(μm) | 6-9 | ≤10 | 5-8 | ≤9 | 5-8 | ≤9 |
| 325M(%) | – | ≤5.0 | – | ≤5.0 | – | ≤5.0 |
| Specific surface areas(㎡/kg) | 420-480 | ≥400 | 450-500 | ≥450 | 450-500 | ≥450 |
| Setting time, min | ||||||
| Initial setting time IS | 150-200 | ≥150 | 150-210 | ≥30 | 210-270 | ≥180 |
| Final setting time FS | 240-300 | ≤360 | 210-270 | ≤300 | 260-320 | ≤360 |
| Flexural strength, Mpa | ||||||
| 1d | 6.5-8.5 | ≥4.0 | 6.0-8.0 | ≥4.0 | 5.5-7.5 | ≥4.0 |
| 3d | 8.5-10.5 | ≥5.0 | 7.0-9.0 | ≥5.0 | 7.0-9.0 | ≥5.0 |
| Compressive strength, Mpa | ||||||
| 1d | 42-52 | ≥25 | 40-50 | ≥25 | 35-45 | ≥25 |
| 3d | 52-62 | ≥30 | 50-60 | ≥30 | 50-60 | ≥30 |
Additional Information of refractory cement CA80
Principal phase: CA, CA2, Aα
Secondary phase: C12A7
Pyrometric cone equivalent: 1750-1800℃
Bulk density: 800-900 kg/m3
Specific gravity: 3.1-3.2 g/cm3
Shelf Life: 6 months
Packaging and Storage of refractory cement CA80
Packing method: Standard export packaging
Paper bags: 25/50kg
Big bags: 1.0/1.5mt
Storage tips：High purity calcium aluminate cements must be stored in dry conditions, off the ground. In this case, it will retain its proper ties for at least 6 months. In many instances, experience has demonstrated that properties are retained for more than one year.