Long-Term Differential and Averaged Deformation of Box-Type Pre-stressed Concrete Exposed to Natural Environment

Middle-scale box-sectional hollow PC ducts, which consist of heterogeneous concrete with different mix proportions, were exposed to natural environments for about three years, and the long-term curvature and axial mean deformation, which have much to do with deflection of long span bridge viaducts,...

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Bibliographic Details
Published inJournal of Advanced Concrete Technology Vol. 16; no. 1; pp. 1 - 17
Main Authors Hayasaka, Shuntaro, Maekawa, Koichi, Chijiwa, Nobuhiro
Format Journal Article
LanguageEnglish
Published Tokyo Japan Concrete Institute 16.01.2018
Japan Science and Technology Agency
Subjects
Climate models
Computer simulation
Concrete
Curvature
Deformation
Ducts
Migration
Moisture
Multiscale analysis
Reliability analysis
Scale models
Viaducts
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ISSN1346-8014
1347-3913
1347-3913
DOI10.3151/jact.16.1

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Summary:Middle-scale box-sectional hollow PC ducts, which consist of heterogeneous concrete with different mix proportions, were exposed to natural environments for about three years, and the long-term curvature and axial mean deformation, which have much to do with deflection of long span bridge viaducts, was gaged for verification of coupled ther-mo-hygral and multi-scale models. The associated internal moisture and the local climate inside micro-pores were measured and the effect of precipitation was quantified over yearly four seasons. The moisture migration linked with concrete multi-scale mechanics was analyzed and the simulation results are compared with the field exposure tests. The reliability of the thermo-hygral analysis, which has been used for estimating the long-term serviceability of bridges, was made firmer.
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ISSN:1346-8014
1347-3913
1347-3913
DOI:10.3151/jact.16.1