Magnesium Phosphate Cement
Magnesium phosphate cement is a new type of phosphate repair materials with early strength and super rapid hardening ability. When compare magnesium phosphate cement with Portland cement, it has high bond strength, minimal dry shrinkage,good abrasion and frost resistance.Therefore, it is widely used in the quick repair of roads,bridges and airport runways.
The magnesium phosphate cement binder is produced from the reaction between magnesium oxide and phosphate in water at room temperature.The Magnesium phosphate cement is able to bond with different substances like concrete, metal, wood, asphalt and various plastics.
Properties of Magnesium Phosphate Cement
- Good durability
- High strength
- Low shrinkage rate
- Low permeability
- Low electrical conductivity
- Good thermal conductivity
- Abrasion resistance
Applications of Magnesium Phosphate Cement
- It is used in the production of high early strength concrete.
- It is used in repair of reinforced concrete stracture.
- It is used in shortcrete application.
- It is used in the production of magnesium based refractory concrete for fireproofing coatings.
Advantages of Magnesium Phosphate Cement
- It sets quickly and gain early strength.
- It has good corrosion resistance ability.
- It resist water penetration due to the formation of insoluble complexes.
- It has little shrinkage properties and hence shrinkage cracks are eliminated.
- Non combustible and resist fire.
- Excellent freeze and thaw resistance.
Disadvantages of Magnesium Phosphate Cement
- It can be easily washed off with plenty of water.
- It cannot be placed in a dry pack condition and hard troweling is not possible.
- It is very difficult to remove it once it has set.
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