Characteristics and Durability of Magnesium Phosphate Cement for Rapid Repair of Concrete Pavements

摘要

This paper presents the research results on characteristics and durability of magnesium phosphate cement-based material (MPB), 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 indicated that MPB materials possessed 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, if the MPB materials soaked in water or 3% NaCI solution for a long period of time, they would lose some strength. Both laboratory and field studies showed that the MPB materials are suitable for rapid repair of concrete structures, especially pavements, airport runways, bridge decks, and major municipal roads, etc.