Journal
CEMENT AND CONCRETE RESEARCH
Volume 41, Issue 1, Pages 9-19Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2010.08.018
Keywords
Concrete; Crack width; Diffusion coefficient; Durability; Migration test
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The purpose of the present study is to explore the diffusion characteristics of cracked concrete according to the width of cracks. Major test variables include crack width, concrete strength, fly ash addition, and maximum aggregate size. The diffusion characteristics have been measured by steady-state migration test. The present study indicates that the diffusion coefficients do not increase with increasing crack widths up to the so-called threshold crack width. The threshold crack width for diffusion is found to be around 55-80 mu m. Above this threshold value, the diffusion coefficients start to increase with crack width. A composite model with the introduction of crack geometry factor was derived to identify the diffusion coefficient in cracked concrete. It was shown that the crack geometry factor ranges from 0.067 to 0.206. Finally, the effects of concrete strength, fly ash addition and maximum aggregate size on diffusion coefficients are also discussed. (C) 2010 Elsevier Ltd. All rights reserved.
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