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Magnesium phosphate cements (MPCs) are receiving increasing attention because of their outstanding properties of fast setting and hardening, good volume stability and excellent bonding to old concrete structures.Their main area of application is thus rapid repair works, but they may also offer prospects for the stabilization /solidification of deleterious waste.Waste immobilization can indeed occur due to two main processes:precipitation as phosphates of very low solubility, and physical encapsulation in the dense matrix.Moreover,because of their near neutral interstitial solution, they may also limit the corrosion of electropositive metals such as aluminum and uranium.