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|
|Data di pubblicazione:||2012|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.conbuildmat.2011.10.013|
|Appare nelle tipologie:||1.1 Articolo in rivista|