Durability and applications of magnesium phosphate material for rapid repair of pavements

摘要

This paper presents some research results on the durability of magnesium phosphate cement-based material, such as strength, coefficient of thermal expansion, drying shrinkage, corrosion protection, deicer-frost resistance, abrasive resistance and strength loss while soaking in water or 3%NaCl solution. Experimental results indicate that MPB materials possess high deicer-frost resistance, high abrasion resistance and high corrosion protection for reinforcing steel. In addition, the MPB materials have good compatibility and bond with old concrete, and very low drying shrinkage. However, for the MPB materials soaked in water or 3% NaCl solution for a long time, the strength loss occurs. Laboratory and field studies show that the MPB materials are suitable for rapid repair of concrete structures, especially pavements, airport runways, bridge decks and key municipal roads, etc.