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Physical and chemical assessment of lime–metakaolin mortars: Influence of binder:aggregate ratio
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Orientador(es)
Resumo(s)
This work evaluates the influence of binder:aggregate ratio on the mineralogical and mechanical properties
of air lime–metakaolin mortars.
Mineralogical analysis showed that binder:aggregate ratio affects the extent of carbonation and pozzolanic
reactions with curing. The pozzolanic reaction occurs mostly at lower curing times (28 days), while,
at higher curing ages, carbonation reaction is mostly dominant. The exceptions are mortars with 1:1 (air:-
lime) volumetric ratio with 30% and 50% MK in which the pozzolanic reaction is still dominant.
The reduction in the mechanical resistance of some compositions observed from 28 to 90 days is
related to the calcium aluminate hydrate instability in the presence of free lime. This instability is
expected to disappear after the total consumption of free lime, either by pozzolanic or carbonation
reaction.
Descrição
Cement & Concrete Composites 45 (2014) 264–271
Palavras-chave
Air lime mortars Metakaolin Pozzolanic phases XRD TG–DTA Mechanical tests
Contexto Educativo
Citação
Editora
Elsevier