Monitoring of reinforced concrete structures affected by alkali-silica reaction
conference paper
Recent inspections of 20 bridges in a highway in The Netherlands revealed that ASR had affected the concrete. Until then alkali-silica reaction (ASR) was a rather rare phenomenon. In view of the expected, future importance of the maintenance of Dutch infrastructure, it was decided to start a long-term monitoring program on the decks of two of the bridges. The methods used are essentially non-destructive. The objective of this investigation is to gain quantitative information on the development of the ASR attack over time. Further the monitoring will be used to evaluate the effects of the applied repair and protection measures. The most promising monitoring methods will be used in the monitoring program of the other 18 bridges.
Measurements include internal humidity, internal and external deformations, and temperature. For some measurements new sensors have been developed. A modified multi-ring electrode has been designed to measure the change in concrete resistance as a function of depth. In this way the effect of drying out of the concrete can be followed. Internal deformations are measured by vibrating wire strain gauges which are inserted in drilled holes extending over the full height of the concrete structure. Monitoring will start effectively in the beginning of 1999 and will continue until 2001.
During the preparation stage of this experimental investigation, an extensive literature was executed to obtain an overview of non-destructive methods available to study the effects of ASR and protection methods.
Measurements include internal humidity, internal and external deformations, and temperature. For some measurements new sensors have been developed. A modified multi-ring electrode has been designed to measure the change in concrete resistance as a function of depth. In this way the effect of drying out of the concrete can be followed. Internal deformations are measured by vibrating wire strain gauges which are inserted in drilled holes extending over the full height of the concrete structure. Monitoring will start effectively in the beginning of 1999 and will continue until 2001.
During the preparation stage of this experimental investigation, an extensive literature was executed to obtain an overview of non-destructive methods available to study the effects of ASR and protection methods.
TNO Identifier
329683
Source title
Proceedings 11th International Conference on Alkali-Aggregate Reaction (ICAAR), Québec, Canada, June
Editor(s)
Bérubé, M.A.
Fournier, B.
Durand, B.
Fournier, B.
Durand, B.
Pages
1205-1214
Files
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