Abstract
The effects of carbonation on the solidification/stabilization (S/S) of zinc using Portland cement Type V (OPC) has been investigated by X-ray photoelectron spectroscopy(XPS) and Fourier transform infrared spectroscopy (FTIR). The FTIR results indicate that carbon dioxide reacts with the metal-bonded and hydrogen-bonded hydroxides [CaZn 2(OH) 6·2H 2O] generally present in zinc-doped Portland cement (Zn-OPC) samples. XPS examinations of the carbonated products of the undoped and doped (Zn-OPC) samples indicate that the resulting silica phases have chemical states different from standard silica gel. Both FTIR and XPS results suggest that carbonation promotes polymerization of the SiO 4 units present in OPC matrix. The chemical states of the surface components obtained by XPS analysis are discussed in the light of polymerization of the silicates.
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