کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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259074 | 503627 | 2012 | 8 صفحه PDF | دانلود رایگان |
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.
▸ We investigated the expansion of concrete containing free CaO. ▸ We found that CaO hydration shows a characteristic length. ▸ Numerical analyses and tests confirm the presence of the characteristic length. ▸ A formula for predicting the CaO expansion in concrete structures is proposed.
Journal: Construction and Building Materials - Volume 29, April 2012, Pages 308–315