Experimental Study of Fracture of Reinforced Steel Bar in Concrete Structures Due to Alkali-Silica Expansion

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Title: Experimental Study of Fracture of Reinforced Steel Bar in Concrete Structures Due to Alkali-Silica Expansion

Author(s): Y. Kubo, O. Iketomi, T. Nakashima, and K. Torii

Publication: Special Publication

Volume: 212

Issue:

Appears on pages(s): 637-652

Keywords: alkali-silica reaction; ASR expansion; diagnosis; environmental condition; fracture mechanisms of steel bar

Date: 6/1/2003

Abstract:
Recently, a number of cases of damaged concrete structures due to alkali-silica reaction (ASR) and/or chloride-induced steel corrosion have been reported. Some ASR-affected concrete structures have been found to be in a severe condition when ASR expansion has continued for a long period. An inspection for the footing of concrete piers was carried out and fractures at bends in steel bars on the edge of the footing was found. It is considered that the fractures were due to excessive ASR expansion in the concrete. However, mechanism of fracture of steel bar due to excessive ASR expansion is not clear. And as results, a model footing made with reactive aggregate was made and tested. In this study, the relationship between the ASR expansion and the stress of steel bar was investigated. From the experimental results, it was found that thestress at the bends in steel bar due to ASR expansion was attained at the yield point of steel bar or beyond it.