High purity calcium aluminate cement CA70 contain only calcium aluminates.
The high calcium aluminate content provides characteristics ideally suited for refractory applications where rapid hardening combined with excellent mechanical resistance and high temperature performance are required. So they are widely recommended for high performance refractories such as low cement, ultra low cement castables.
| Item/Grade | CA70 | |||||
|---|---|---|---|---|---|---|
| CA70 | CA70W | CA70S | CA71 | |||
| Chemical Composition | ω (SiO2) ≤/% | 0.5 | 0.5 | 0.5 | 0.5 | |
| ω (Al2O3)/% | 68.5-70.5 | 68.5-70.5 | 68.5-70.5 | 69.5-71.5 | ||
| ω (Fe2O3) ≤/% | 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 | ||
| ω (MgO) ≤/% | 0.4 | 0.4 | 0.4 | 0.4 | ||
| ω (R2O) ≤/% | 0.4 | 0.4 | 0.4 | 0.4 | ||
| ω (S) ≤/% | / | / | / | / | ||
| ω (Cl) ≤/% | / | / | / | / | ||
| Fineness | d50/μm | 11-4 | 8-11 | 6-9 | 10-13 | |
| -45μm ≤/% | 8.0 | 5.0 | 5.0 | 8.0 | ||
| Setting Time | Initial Setting Time (min) | 120-180 | 30-90 | 180-240 | 150-210 | |
| Final Setting Time (min) | 150-240 | 90-180 | 240-330 | 210-300 | ||
| Strength (ISO) | Flexural Strength/Mpa | 24h | 7.5-10.0 | 8.0-10.5 | 8.0-10.5 | 8.5-11.0 |
| 72h | 10.0-12.0 | 10.5-12.5 | 10.5-12.5 | 11.0-12.5 | ||
| Compressive Strength/Mpa | 24h | 40-50 | 45-55 | 45-55 | 50-60 | |
| 72h | 45-55 | 50-60 | 50-60 | 55-65 | ||
| 325M ≤/% | / | / | / | / | ||
| Specific Surface Areas ≥/ (㎡/kg) | / | / | / | / | ||