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Brief introduction of refractory cement CA70
CA70 has moderate setting time and hardening properties, so it exhibits excellent additive compatibility and dose-rate tolerance in all types of deflocculation systems, ensuring the flexibility of optimized formulations.
The high calcium aluminate content provides characteristics well suited to refractory applications where rapid hardening and excellent mechanical and high-temperature properties are required. Therefore, they are widely recommended for high performance refractory materials such as low cement and ultra-low cement castables.
The 70%alumina cements of KERUI are represented by three product types，CA70，CA70W and CA70S.
” CA70 and CA70W do not contain any additives and a -Al2O3. “
Brief introduction of refractory cement CA70W
With short setting time and high early strength, CA70W is suitable for low temperature environment, especially in winter and other emergency situations, such as quick installation or emergency maintenance.
Notes: refractory cement = high alumina cement = Calcium aluminate cement
More relevant refractory products: Corundum brick
Parameters of refractory cement CA70S
| Series | CA70 | CA70 | CA70W | CA70W | CA70S | CA70S |
| Workable time | Moderate | Moderate | Short | Short | Longer | Longer |
| Standard | Usual range | Specification limit | Usual range | Specification limit | Usual range | Specification limit |
| SiO2, % | 0.2-0.7 | ≤1.0 | 0.2-0.7 | ≤1.0 | 0.2-0.7 | ≤1.0 |
| Al2O3, % | 68.5-70.5 | ≥68 | 68.5-70.50. | ≥68 | 68.5-70.5 | ≥68 |
| Fe2O3, % | 0.1-0.5 | ≤0.7 | 1-0.5 | ≤0.7 | 0.1-0.5 | ≤0.7 |
| CaO, % | 28.5- 29.5 | – | 28.5-29.5 | – | 28.5-29.5 | – |
| R2O, % | – | ≤0.4 | – | ≤0.4 | – | ≤0.4 |
| S-, % | – | ≤0.1 | – | ≤0.1 | – | ≤0.1 |
| CI-, % | – | ≤0.06 | – | ≤0.06 | – | ≤0.06 |
| d50(μm) | 44149 | ≤14 | 44022 | ≤10 | 44149 | ≤14 |
| 325M(%) | – | ≤8.0 | – | ≤5.0 | – | ≤8.0 |
| Specific surface areas, ㎡/kg | 380-420 | ≥350 | 400-450 | ≥400 | 380-420 | ≥350 |
| Setting time, min | ||||||
| Initial setting time IS | 180-240 | ≥150 | 60-120 | ≥30 | 240-270 | ≥180 |
| Final setting time FS | 240-300 | ≤360 | 120-180 | ≤240 | 300-360 | ≤360 |
| Flexural strength, Mpa | ||||||
| 1d | 9.0-11.0 | ≥5.0 | 9.0-11.0 | ≥5.0 | 8.0-11.0 | ≥5.0 |
| 3d | 11.0-12.0 | ≥6.0 | 11.0-12.0 | ≥6.0 | 11.0-12.0 | ≥6.0 |
| Compressive strength, Mpa | ||||||
| 1d | 45-55 | ≥30 | 45-55 | ≥30 | 45-55 | ≥30 |
| 3d | 55-65 | ≥40 | 55-65 | ≥40 | 60-70 | ≥40 |