Guide to the Core Characteristics and Industrial Applications of High-Alumina Cement

I. Material Characteristics: Performance Advantages in High-Temperature Environments

1. Outstanding Early Strength

• Within 24 hours, the strength can reach 3 times that of ordinary Portland cement (50-60 MPa), suitable for emergency repairs (e.g., 72-hour repair of airport runways).

• Note: After 28 days, due to the phase transformation of CA→CA₂, porosity increases, leading to a 20-30% decrease in strength, which needs to be controlled with mineral admixtures (15% silica fume).

2. High-Temperature Performance

• Refractoriness reaches 1580℃ (when Al₂O₅ ≥ 50%), with a high-temperature residual strength retention rate of over 80% (tested at 1000℃).

• The hydration product CAH₁₀ dehydrates at 300℃ and reconstitutes into a dense ceramic structure.

3. Chemical Resistance

• Sulfate resistance coefficient K > 1.0 (ASTM C1012 standard), due to the absence of free Ca(OH)₂ formation.

• In acidic environments (pH = 3-11), the Al(OH)₃ gel layer provides dynamic protection.

II. Core Functions and Material Compatibility

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