Publication: Microstructure and mineralogy of lightweight aggregates produced
from washing aggregate sludge, fly ash and used motor oil
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Publication Date
2010
Authors
González Corrochano, B.
Alonso Azcárate, Jacinto
Rodas, Magdalena
Luque del Villar, Francisco Javier
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Publisher
Elsevier Applied Science
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Abstract
The microstructures and mineralogical compositions of lightweight aggregates (LWAs) manufactured
with washing aggregate sludge (WS), fly ash (FA) and used motor oil (UMO) have been studied. Most
LWAs with WS and FA exhibited an external layer and a glassy core with isolated pores. LWAs with
WS and UMO did not present external shells or signs of bloating. Iron oxides, within the external layer,
and pyrrhotite, in the inner glass, were observed. The mineralogical analyses revealed the neo-formation
of plagioclase and pyroxene, along with minor gehlenite. Some relationships could be established: (i) the
presence of larger pores is related to a decrease in the dry particle density values, (ii) when the LWA lacks
the external layer, the water absorption values were dependent on the size and amount of each type of
pore (open or closed), and (iii) the neo-formation of Ca-plagioclase and the consumption of quartz
improved the compressive strength values.