The difference between sulfoaluminate cement and silicate cement
Release time: 2025-04-16
The core differences between sulfoaluminate cement and Portland cement lie in mineral composition, performance characteristics
The core differences between sulfoaluminate cement and Portland cement lie in mineral composition, performance characteristics, and application scenarios. Sulfate aluminate cement has characteristics such as early strength, corrosion resistance, and frost resistance, making it suitable for special engineering projects; And Portland cement is a universal cement with more balanced performance but weaker corrosion resistance.
The specific differences are as follows:
Mineral composition
Sulfate aluminate cement is mainly composed of anhydrous calcium sulfoaluminate (C ₄ A ∝ S ̄) and dicalcium silicate (C ₂ S), while silicate cement is mainly composed of tricalcium silicate (C ∝ S) and dicalcium silicate. This difference determines the difference in hydration reaction and performance between the two.
Performance characteristics
Early strength and high strength: The early strength of sulfoaluminate cement is 5-8 times that of Portland cement, and the strength can reach 50-70 MPa in 3 days, which is equivalent to the 28 day strength of Portland cement.
Corrosion resistance: sulfoaluminate cement exhibits strong resistance to corrosive environments such as seawater, salt alkali, and sulfate, with a corrosion coefficient (Kn value) often greater than 1; And the strength of Portland cement significantly decreases in the same environment.
Frost resistance: sulfoaluminate cement can still be used for construction at negative temperatures (-20 ℃), and the frost resistance grade of concrete reaches 200 # or above.
Low alkalinity: The pH of the hydrated liquid phase of sulfoaluminate cement is 11.5-12.0, which has a weaker protective effect on steel bars than Portland cement (pH>12.5). It should be used with caution in projects that require long-term protection of steel bars.
Application scenarios
Sulfate aluminate cement: suitable for emergency repair and construction (such as road repair), winter construction, marine engineering, GRC products (glass fiber reinforced cement), anti-seepage engineering, etc.
Portland cement: widely used in conventional scenarios such as ordinary buildings, residential buildings, roads and bridges.
Other differences
Environmental friendliness: The production energy consumption of sulfoaluminate cement is lower (burning temperature is 150 ℃ lower), and industrial waste such as fly ash can be utilized, which meets the needs of circular economy.
Usage restrictions: The long-term use temperature of sulfoaluminate cement should not exceed 80 ℃, while silicate cement does not have this restriction.
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