Alkali silica reaction (ASR); Damage Rating Index (DRI); Prognosis; Residual expansion test; Stiffness damage test (SDT); Alkali silica reaction; Alkali-silica reaction; Damage rating index; Damage tests; Expansion tests; Prognose; Residual expansion; Stiffness damage test; Civil and Structural Engineering; Building and Construction; Materials Science (all)
Abstract :
[en] Currently, ASR damage evaluation of concrete road infrastructure can be done following FHWA protocol (Fournier et al., 2010) [1]. The current level of ASR damage (diagnosis) is evaluated using the Damage Rating Index (DRI) and the Stiffness Damage Test (SDT), and future potential of damage (prognosis) is assessed using residual expansion tests, in humid air (> 95 % RH and T = 38 ± 3 °C) and alkaline solution (NaOH 1 N, 38 ± 3 °C). While accelerated expansion tests on cores have been used for decades, they provide only limited insights into ASR severity, without providing information on the ASR damage mechanisms, nor allowing extrapolation to the structural level. The aim was to identify correlations between pre- and post-expansion test results and additional expansion generated by assessing the actual extent and mechanisms of extra ASR damage caused by these tests. Results of the expansion tests in humid air were inconclusive, making the test procedure questionable. On the other hand, residual expansion tests in alkaline solution proved to be more relevant for assessing potential future damage to concrete. No new damage mechanism related to the added alkalis could be identified. The results indicated a comparable progression of ASR damage between the NaOH solution and in situ conditions. A cracking pattern in concrete at high expansion levels due to ASR was identified based on petrographic examination of test specimens following residual expansion testing in 1 N NaOH solution.
Disciplines :
Civil engineering
Author, co-author :
Baret, E. ; Université de Liège, UEE Building Materials, Liège, Belgium
Fournier, B.; Université Laval, 1065, Département de géologie et de génie géologique, Québec, Canada
Bissonnette, B.; Université Laval, Département de génie civil et de génie des eaux, Québec, Canada
Khaleghi, M.; Université Laval, 1065, Département de géologie et de génie géologique, Québec, Canada
Courard, Luc ; Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil ; Université de Liège - ULiège > Urban and Environmental Engineering
Ranger, M.; Université Laval, 1065, Département de géologie et de génie géologique, Québec, Canada
Language :
English
Title :
Assessment of additional ASR damage resulting from residual expansion tests using the DRI and SDT test methods
Authors would like to thank the MITACS exchange project n \u00B0 IT38099 and the Wallonia-Brussels/Qu\u00E9bec Scientific Cooperation project (2022\u20132024) which contributed to the financial support. This research and development project would not have been possible without the financial and technical contribution and collaboration of The Jacques Cartier and Champlain Bridges Incorporated.
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