Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 33, Issue -, Pages 99-108Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2012.01.017
Keywords
Alkali-activated concretes; Slag/metakaolin blends; Mechanical strength; Chloride permeability; Carbonation
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Funding
- Universidad del Valle (Colombia)
- Center of Excellence of Novel Materials (CENM)
- Patrimonio Autonomo Fondo Nacional de Financiamiento para la Ciencia, la Tecnologia y la Innovacion Francisco Jose de Caldas [275-2011]
- Australian Research Council (ARC) through the Particulate Fluids Processing Centre
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The effects of activation conditions on the engineering properties of alkali-activated slag/metakaolin blends are examined. At high activator concentration, compressive strengths at early age are enhanced by the inclusion of metakaolin in the binder. A similar effect is observed in the flexural strength of the concretes, as dissolution and reaction of metakaolin is favoured under higher-alkalinity activation conditions. Increased metakaolin contents and higher activator concentrations also lead in most cases to reduced water sorptivity and lower chloride permeability. The correlation between the outcome of the rapid chloride permeability test (RCPT) and a directly-measured chloride diffusion coefficient is weak, revealing the limitations of the RCPT when applied to alkali-activated concretes. Accelerated carbonation, induced by exposure to elevated CO2 concentrations, leads to a reduction in compressive strength and an increased permeability; however, there is not a linear relationship between carbonation depth and total porosity, indicating that CO2 diffusion is not the only parameter controlling the carbonation of these materials. (C) 2012 Elsevier Ltd. All rights reserved.
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