%0 Journal Article
%A González Corrochano, B.
%A Alonso Azcárate, Jacinto
%A Rodas, Magdalena
%A Luque del Villar, Francisco Javier
%A Fernández Barrenechea, José María
%T Microstructure and mineralogy of lightweight aggregates producedfrom washing aggregate sludge, fly ash and used motor oil
%D 2010
%@ 0958-9465
%U https://hdl.handle.net/20.500.14352/42468
%X The microstructures and mineralogical compositions of lightweight aggregates (LWAs) manufacturedwith washing aggregate sludge (WS), fly ash (FA) and used motor oil (UMO) have been studied. MostLWAs with WS and FA exhibited an external layer and a glassy core with isolated pores. LWAs withWS 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-formationof plagioclase and pyroxene, along with minor gehlenite. Some relationships could be established: (i) thepresence of larger pores is related to a decrease in the dry particle density values, (ii) when the LWA lacksthe external layer, the water absorption values were dependent on the size and amount of each type ofpore (open or closed), and (iii) the neo-formation of Ca-plagioclase and the consumption of quartzimproved the compressive strength values.
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