variation of shrinkage strain within the depth of concrete beams
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ID: 130518
2015
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Abstract
The variation of shrinkage strain within beam depth was examined through four series of time-dependent laboratory experiments on unreinforced concrete beam specimens. Two types of beam specimens, horizontally cast and vertically cast, were tested; shrinkage variation was observed in the horizontally cast specimens. This indicated that the shrinkage variation within the beam depth was due to water bleeding and tamping during the placement of the fresh concrete. Shrinkage strains were measured within the beam depth by two types of strain gages, surface-attached and embedded. The shrinkage strain distribution within the beam depth showed a consistent tendency for the two types of gages. The test beams were cut into four sections after completion of the test, and the cutting planes were divided into four equal sub-areas to measure the aggregate concentration for each sub-area of the cutting plane. The aggregate concentration increased towards the bottom of the beam. The shrinkage strain distribution was estimated by Hobbs’ equation, which accounts for the change of aggregate volume concentration.
| Reference Key |
jeong2015materialsvariation
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|---|---|
| Authors | ;Jong-Hyun Jeong;Yeong-Seong Park;Yong-Hak Lee |
| Journal | Nature Materials |
| Year | 2015 |
| DOI |
10.3390/ma8115421
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| URL | |
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