Characterisation of bending cracks in R/FRC using image analysis

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• 作者：Carlos G. Berrocal^a ; ^b ; ^{carlos.gil@chalmers.se" class="auth_mail" title="E-mail the corresponding author} ; Ingemar Lö ; fgren^a ; ^b ; Karin Lundgren^a ; Niclas Gö ; rander^a ; Christopher Halldé ; n^a
• 关键词：B. Crack detection ; B. Image analysis ; C. Durability ; E. Fibre reinforcement
• 刊名：Cement and Concrete Research
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：90
• 期：Complete
• 页码：104-116
• 全文大小：2100 K

文摘

In this study, experiments were conducted to induce bending cracks of specific surface crack width to reinforced concrete beams made of plain concrete (RC) and reinforced concrete beams made of fibre reinforced concrete (R/FRC). After injecting and impregnating the cracks with dyed epoxy resin, image processing and analysis were employed to investigate the internal crack morphology. Several crack features including crack width (accumulated, effective and maximum), branching and tortuosity were defined and quantified. The results showed that in addition to arrested crack development, the presence of fibres yielded a distinctive change in the internal crack pattern, including increased branching and tortuosity, both of which have positive implications regarding concrete permeation. Likewise, specimens with fibres exhibited reduced maximum individual crack widths near the rebar, potentially increasing the ability of autogenous crack healing and reducing the risk of corrosion initiation.