Solidification/stabilization of Ni(II) by various cement pastes
Maha Rabea Abu-Serea; Eisa E. Hekal; Essam A. Kishar;
Abstract
The immobilization of Ni(II) in various cement matrices was investigated using the solidification/stabilization
(S/S) technique. The different cement pastes used in this study were neat Portland cement in
absence and presence of water reducing- and water repelling-admixtures as well as blended cement with
kaolin. Two ratios of Ni(II) were used (0.5% and 1.0% by weight of the solid binder). The hydration characteristics
of the used cement pastes were tested via the determination of the combined water content,
phase composition and compressive strength at different time intervals from 1 up to 180 days. The
results show that the presence of NiCl2 caused retardation for the hydration of Portland cement paste
in absence and presence of water-reducing agent. But NiCl2 caused acceleration rather than retardation
on the hydration of the mixes containing calcium stearate and/or clay. The degree of immobilization of
the added heavy metal ions was very high in the different investigated cement pastes.
(S/S) technique. The different cement pastes used in this study were neat Portland cement in
absence and presence of water reducing- and water repelling-admixtures as well as blended cement with
kaolin. Two ratios of Ni(II) were used (0.5% and 1.0% by weight of the solid binder). The hydration characteristics
of the used cement pastes were tested via the determination of the combined water content,
phase composition and compressive strength at different time intervals from 1 up to 180 days. The
results show that the presence of NiCl2 caused retardation for the hydration of Portland cement paste
in absence and presence of water-reducing agent. But NiCl2 caused acceleration rather than retardation
on the hydration of the mixes containing calcium stearate and/or clay. The degree of immobilization of
the added heavy metal ions was very high in the different investigated cement pastes.
Other data
| Title | Solidification/stabilization of Ni(II) by various cement pastes | Authors | Maha Rabea Abu-Serea ; Eisa E. Hekal ; Essam A. Kishar | Keywords | Solidification/stabilization;Hydration characteristic of cement;Admixtures;Immobilization;Heavy metals | Issue Date | Jan-2011 | Publisher | Elsevier | Journal | Construction and Building Materials | Volume | 25 | Issue | 1 | Start page | 109 | End page | 114 | DOI | 10.1016/j.conbuildmat.2010.06.051 |
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| Ni.pdf | 310.39 kB | Adobe PDF | Request a copy |
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