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Closed Access item Random ionic mobility on blended cements exposed to aggressive environments

Authors:García, R.
Rubio, V.
Vegas, Iñigo
Frías, M.
Keywords:Ionic diffusion, Pozzolan, Paper sludge, Waste, Saline environment
Issue Date:Sep-2009
Publisher:Elsevier
Citation:Journal of Hazardous Materials 168(2-3): 1602-1608(2009)
Abstract:[EN] It is known that the partial replacement of cement by pozzolanic admixtures generally leads to modifications in the diffusion rates of harmful ions. Recent research has centred on obtaining new pozzolanic materials from industrial waste and industrial by-products and on the way that such products can influence the performance of blended cements. This paper reports the behaviour of cements blended with calcined paper sludge (CPS) admixtures under exposure to two different field conditions: sea water and cyclic changes in temperature and humidity. Cement mortars were prepared with 0% and 10% paper sludge calcined at 700 °C. The penetration of ions within the microstructure of cement matrices was studied using X-ray diffraction (XRD) and scanning electron microscopy equipped with an energy dispersive X-ray analyser (SEM/EDX) analytical techniques. The results show that ionic mobility varies substantially according to the type of exposure and the presence of the calcined paper sludge. The incorporation of 10% CPS is shown to assist the retention and diffusion of the ions.
Publisher version (URL):http://dx.doi.org/10.1016/j.jhazmat.2009.03.055
URI:http://hdl.handle.net/10261/36749
ISSN:0304-3894
Appears in Collections:(IETCC) Artículos

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