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- Title
Development of early age shrinkage stresses in reinforced concrete bridge decks.
- Authors
Gergis William; Samir Shoukry; Mourad Riad
- Abstract
Abstract  This paper describes the instrumentation and data analysis of a reinforced concrete bridge deck constructed on 3-span continuous steel girders in Evansville, West Virginia. An instrumentation system consisting of 232 sensors is developed and implemented specifically to measure strains and temperature in concrete deck, strains in longitudinal and transverse rebars, the overall contraction and expansion of concrete deck, and crack openings. Data from all sensors are automatically collected every 30 minutes starting at the time of placing the concrete deck. Measured strain and temperature time-histories were used to calculate the stresses, which were processed to attenuate the thermal effects due to daily temperature changes and isolate the drying shrinkage component. The results indicated that most of concrete shrinkage occurs during the first three days. Under the constraining effects from stay-in-place forms and reinforcement, early age shrinkage leads to elevated longitudinal stress, which is the main factor responsible for crack initiation.
- Subjects
EXPANSION &; contraction of concrete; EXPANSIVE concrete; CONCRETE; CONSTRUCTION materials
- Publication
Mechanics of Time-Dependent Materials, 2008, Vol 12, Issue 4, p343
- ISSN
1385-2000
- Publication type
Article
- DOI
10.1007/s11043-008-9067-4