Evaluation of soil insulation effect on thermal behavior of drilled shafts as mass concrete. Issue 1 (1st January 2018)

• Record Type: Journal Article
• Authors: Han, Sangyoung; Chun, Sanghyun; Kim, Kukjoo; Lawrence, Adrian M.; Tia, Mang
• Is Part Of: Cogent engineering. Volume 5:Issue 1(2018)
• Publication Date: 2018-01-01
• Subjects: mass concrete -- drilled shaft -- soil's thermal properties -- moisture content -- maximum temperature difference; Engineering -- Periodicals; Technology -- Periodicals; Engineering; Technology; Periodicals; 620
• DOI: 10.1080/23311916.2018.1468202
• Languages: English
• ISSNs: 2331-1916

Abstract

Abstract: 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.