A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Random ionic mobility on blended cements exposed to aggressive environments
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 CPS (calcined paper sludge) 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 deg C. The penetration of ions within the microstructure of cement matrices was studied using XRD (X-ray diffraction) and scanning electron microscopy equipped with an SEM/EDX (energy dispersive X-ray analyser) 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.
Random ionic mobility on blended cements exposed to aggressive environments
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 CPS (calcined paper sludge) 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 deg C. The penetration of ions within the microstructure of cement matrices was studied using XRD (X-ray diffraction) and scanning electron microscopy equipped with an SEM/EDX (energy dispersive X-ray analyser) 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.
Random ionic mobility on blended cements exposed to aggressive environments
Garcia, Rosario (author) / Rubio, Virginia (author) / Vegas, Inigo (author) / Frias, Moises (author)
Journal of Hazardous Materials ; 168 ; 1602-1608
2009
7 Seiten, 9 Bilder, 3 Tabellen, 31 Quellen
Article (Journal)
English
Zementherstellung , puzzolanische Reaktion , Schlamm , Papier , Diffusion , Abfall (Müll) , Recycling , Mörtel , Ion , Mobilität
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