[L80] 耐久性一般Ⅳ／耐火性Ⅱ

[L1192] Characterization of crack geometry in fire-damaged high-strength concrete under re-curing using X-ray CT

Michael HENRY¹,Ivan Sandi DARMA¹,杉山 隆文² (1.Hokkaido University,2.北海道大学)

キーワード：火害,水中再養生,ひび割れ形状,ひび割れ分布,X線CT

This research applied X-ray microtomography and image analysis techniques to characterize the changes in crack geometry in a high-strength concrete specimen after heating at 600ºC and subsequent water re-curing up to 28 days. Results showed that cracks formed in the mortar-aggregate interface and bridged between aggregates, as well as enlarged the existing air voids. Water re-curing reduced the total crack space and a finer crack distribution could be observed after 28 days, but healing of surface cracks reduced water supply and limited healing in the inner part of the concrete.
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