4 - Magnesium phosphate cement

Abstract

Magnesium phosphate cements (MPCs) are clinker-free materials using a blend of calcined magnesium oxide and hydrophosphates, together with specific additives and fillers in most cases, generally binding through both acid-base and hydration reactions. In the past decades, especially the last 20 years, MPCs have made major strides in the aspects of theoretical research, laboratory investigation and field application. This chapter briefly reviews that evolution of MPCs, and presents the general compositions, theories, and technologies with an emphasis on recent development and applications. Much of the focus is on the comprehension of the role of key components in fabricating MPCs, the elaboration of reaction theory and hydration behaviors, the exploitation of unique properties, and the improvement of applicability. Some cases that MPCs have been and are being developed as rapid-setting cements for structure repair and reinforcement, hazardous and radioactive waste stabilization, biomedical applications, and other potential usages, are also introduced in the end of the chapter. It is hoped that the fundamental information and key findings reported will lead to wider curiosity in MPCs and further research and development in this field.