Effect of Alkali Silica Reaction on bond strength and load capacity of reinforced concrete structures

Publication Type:
Conference Proceeding
FIB 2018 - Proceedings for the 2018 fib Congress: Better, Smarter, Stronger, 2019, pp. 3088-3099
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© 2019 by the fib. All rights reserved. Among the deterioration phenomena of reinforced concrete structures, alkali-silica reaction (ASR) is a potential source of long-term deterioration, particularly after 15 to 25 years of construction. Conventionally, in-situ load testing is employed, particularly for bridges, to assess the residual load capacity of the ASR affected super-structures. Such methods, however, are labour intensive, unsafe, time consuming and may cause unpredictable further damage to the structure. Assessing residual load carrying capacity of ASR affected reinforced concrete bridge super-structure is still unclear and not well understood. The long-term load carrying capacity of ASR affected reinforced concrete bridge super-structure consisting of beams and a deck slab is based on deteriorated beams and unaffected slab and this area needs further research. Often, when the neutral axis depth at ultimate limit state of bending falls below the soffit of deck level, there is a considerable reduction in the bending capacity can be expected, whereas, when the neutral axis depth falls within the in-situ slab thickness, bond deterioration may play a critical role in the moment carrying capacity reduction. While mid-span positions are critical for bending, as expected, shear capacity reductions are critical near support positions. In this paper, long-term bond deterioration between reinforcement and concrete, residual moment carrying capacity and residual shear capacity of beams due to ASR are discussed. The reduction in moment carrying capacity and shear capacity of beams and its effect on the over-all capacity of the bridge deck is also illustrated.
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