Search results for "magnesium phosphate cement"
showing 2 items of 2 documents
Conditioning metallic aluminum in magnesium phosphate cements
2016
This work deals with the stabilization / solidification of radioactive waste using cement.More particularly, it aims at assessing the chemical compatibility between metallic aluminum and mortars based on magnesium phosphate cement. The physical and chemical processes leading to setting and hardening of the cement are first investigated. X-ray diffraction (XRD), thermogravimetry (TGA) and nuclear magnetic resonance spectroscopy (31P and11B MAS-NMR) arefirst used to characterize the solid phases formed during hydration, while inductively coupled plasma atomic emission spectroscopy analysis (ICP-AES), electrical conductimetry and pH measurementsprovide information on the pore solution composit…
Influence of boric acid on the hydration of magnesium phosphate cement at an early age
2015
International audience; 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.The main constituents of MPCs are magnesium oxide (calcined, or hardburnt, magnesia) and a water-soluble acid phosphate, which is most often diammonium hydrogen phosphate (NH$_4$)$_2$HPO$_4$. To avoid the release of noxious gaseous ammonia during the hardening process, potassium dihydrogen phosphate (KH$_2$P…