A size-effect theory is herein introduced to investigate the average expansion of concrete containing free lime (CaO) and impurities. By drawing an analogy with the structural size-effect, the phenomenon of CaO hydration shows a characteristic length, whose dimension remains constant at all scales. If a grain of free lime is assumed to be a sphere, only a thin layer on the external surface hydrates and doubles the volume, as confirmed by the results of 2D finite element analyses and by some experimental observations. For practical applications, a simplified chemo-mechanical model of CaO hydration is eventually proposed, to predict the consequences of uncombined lime in concrete structures.
A chemo-mechanical model of lime hydration in concrete structures / Chiaia, Bernardino; Fantilli, Alessandro Pasquale; Ventura, Giulio. - In: CONSTRUCTION AND BUILDING MATERIALS. - ISSN 0950-0618. - STAMPA. - 29:(2012), pp. 308-315. [10.1016/j.conbuildmat.2011.10.013]
Titolo: | A chemo-mechanical model of lime hydration in concrete structures | |
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Data di pubblicazione: | 2012 | |
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Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.conbuildmat.2011.10.013 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |
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http://hdl.handle.net/11583/2462591