Managing Premature Concrete Deterioration in Bridges
Publication: Structures Congress 2009: Don't Mess with Structural Engineers: Expanding Our Role
Abstract
In recent years concrete bridge structures in the USA have been experiencing an unusually high level of premature concrete deterioration. The most common characteristics of this deterioration are longitudinal cracking along the bottom flange at the prestressed beam ends, cracking in unreinforced areas of cast-in-place concrete, and general map cracking with discoloration on concrete surfaces. Further testing of these bridges has revealed the cause of the deterioration is due to Alkali-Silica Reaction (ASR). This paper addresses key aspects in the detection and management of premature deterioration due to ASR for concrete bridges. Detection methods discussed include crack and surface discoloration mapping and as well as procedures for excising samples for petrography and expansion testing. Detailed visual observations of the distressed conditions as well as laboratory test results are then used to develop a course of action to manage further premature concrete deterioration from ASR. Management methods discussed include long-term monitoring, repair strategies that reflect the severity of the deterioration, and measures to mitigate water infiltration into the concrete surfaces.
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Copyright
© 2009 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Architectural engineering
- Beams
- Bridge engineering
- Bridge management
- Bridge tests
- Bridges
- Bridges (by material)
- Building management
- Concrete beams
- Concrete bridges
- Continuum mechanics
- Cracking
- Deterioration
- Engineering fundamentals
- Engineering mechanics
- Field tests
- Fracture mechanics
- Geomatics
- Maintenance and operation
- Mapping
- Materials characterization
- Materials engineering
- Solid mechanics
- Structural engineering
- Structural members
- Structural systems
- Surveying methods
- Tests (by type)
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