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Author(s): D. A. Pereira
Barroso de Aguiar
F. Castro
M. F. Almeida
J. A. Labrincha
Title: Mechanical behaviour of Portland cement mortars with incorporation of Al-containing salt slags
Issue Date: 2000
Abstract: Recovery of a salt cake slag produced from aluminum scrap re-melted in rotary furnaces, at the lowest cost, while complying with allenvironmental laws is the main objective of this study. The characterisation of the slag residue involved determinations of the water leachingconditions, toxicological analysis, chemical analysis of the leaching waste, and mineralogical composition. A two-phase study was made todetermine the effect of waste additions on mechanical properties of cement mortars, involving partial replacements of either sand or cement.SEM characterisation of fracture surfaces was also made. Partial substitution of cement, which is the most expensive component of themortar, by salt slag has both environmental and economical advantages. However, only small amounts (up to 10 wt.%) can be replaced bywashed slag without significant damage to mortar characteristics. Sand substitution by slag is less problematic and 30 ± 50 wt.% replacementlevels are easily achieved. However, the direct economical impact is less relevant. The incorporation of unwashed slag in impracticable, as aresult of noxious gases released and significant volumetric expansion effects
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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