The Hydration of Heavy Metal Salts Admixtured High Alumina Cement – A X-Ray Diffraction Study

Abstract

The XRD, Setting time and Compressive strength results of the hydration of High Alumina Cement (HAC) with different concentrations of Cr, Cd, Pb, Zn and Mg as impurities are presented. The heavy metal salts are doped from 100 to 15000ppm in various steps. The hydration products are investigated both qualitatively and quantitatively by X-ray powder diffraction. The initial, final setting time and strength of heavy metal salts doped HAC, which are measured and compared with the phases at different time intervals are discussed. The results show that various concentrations of heavy metal salts doped HAC can play an effective role in conversion reactions (i.e.) from metastable to stable hydrates imparting setting time and strength. It is observed that a lower concentration of industrial waste metal ions do not affect the characteristics of the blend.

Solidification/stabilization of toxic metals in calcium aluminate cement matrices

“…Interaction between CACs and alkaline and alkaline-earth metal chlorides has been reported focusing on the hydration chemistry and on the setting behavior [16][17][18]. Results were recognized to be unclear and sometimes opposite to those obtained with OPC.…”