Abstract:
This thesis was focused on influence of heavy metals from solidification in low concentration and leaching analysis.
The studied heavy metals oxides included cadmium oxide, chromic oxide and nickel monoxide. The Ordinary Portland
Cement (OPC) was used as solidification binder. The variations of initial concentrations of heavy metals were
in the range of 0.1-2.0% by weight of clinker. The cement mortar characteristics were analyzed by X-ray diffraction (XRD).
It was found that heavy metals reacted with the major phases of cement mortar causing the formation of new compounds
of heavy metals. The new compounds affected on the cement mortar properties by decreasing the compressive strengths.
In the study of heavy metals leaching behavior, using Toxicity Characteristic Leaching Procedure Test (US. EPA.), cement
mortars contaminated with chromium higher than 0.1 percent by weight of clinker were classified as hazardous waste. However,
cement mortars contaminated with cadmium and nickel up to 2.0 percent by weight of clinker were not classified as hazardous
waste. The leaching ability of heavy metals (at the same initial concentration) from cement mortar can be sequenced as
chromium > cadmium > nickel.