Evaluation of soil insulation effect on thermal behavior of drilled shafts as mass concrete

This study focused on investigating the early-age thermal behavior of drilled shafts under different surrounding soil's thermal properties. Four 1.8 m (6 ft) diameter drilled shafts were constructed using two different concrete mixes and two different soil conditions. A finite element (FE) mode...

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Bibliographic Details
Published in:Cogent engineering 2018-01, Vol.5 (1), p.1468202
Main Authors: Han, Sangyoung, Chun, Sanghyun, Kim, Kukjoo, Lawrence, Adrian M., Tia, Mang
Format: Article
Language:English
Subjects:
Age
Concrete construction
drilled shaft
Finite element method
Fly ash
Gravimetry
Heat of hydration
Insulation
Mass concrete
Mathematical models
maximum temperature difference
Moisture content
Parametric analysis
Soil conditions
Soil moisture
Soil properties
soil's thermal properties
Temperature
Temperature gradients
Thermodynamic properties
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Summary:This study focused on investigating the early-age thermal behavior of drilled shafts under different surrounding soil's thermal properties. Four 1.8 m (6 ft) diameter drilled shafts were constructed using two different concrete mixes and two different soil conditions. A finite element (FE) model was developed to estimate the temperature development of drilled shafts at early-age and validated using temperatures measured from full-scale drilled shafts constructed in the field. The validated analytical model was then used to perform a parametric analysis to evaluate the effects of the surrounding soils at different moisture conditions on change in thermal behavior of drilled shafts at early-age. Results indicated that the FE model developed was capable of accurately predicting temperature development of drilled shafts at early-age. A drier surrounding soil (i.e., gravimetric moisture content of 0% through 6%) was able to serve as a better insulating material that leads to reduced temperature difference in the drilled shafts. Also, it was identified the use of high-volumefly ash concrete mix in conjunction with relatively low heat of hydration can reduce the temperature difference in the drilled shaft.
ISSN:2331-1916
2331-1916
DOI:10.1080/23311916.2018.1468202