Optimization of Design Parameters for Enhanced Integrity of Massive Drilled Shaft
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 4
Abstract
This study focused on the optimization of concrete mixture and geometric design parameters for a drilled shaft to effectively reduce the potential degradation of mass concrete. At concrete’s early hardening stage, the heat of hydration plays a pivotal role that affects the integrity of mass concrete. The Florida Department of Transportation (FDOT) currently designates concrete drilled shafts with a minimum diameter of 1.8 m as mass concrete due to a great concern about high temperature development. In this study, a validated thermal finite-element (FE) model for a drilled shaft with a diameter of 1.8 m was developed for a parametric analysis to determine the effects of concrete property, surrounding soil condition, geometric design, and pipe cooling on temperature development. The results indicated that the use of supplementary cementitious material (SCM) significantly reduced the temperature development in a drilled shaft. The temperature development increased as the placement temperature and volume:surface area () ratio increased. In particular, the use of a centroid void shaft and a pipe cooling system significantly decreased the maximum temperature and temperature differential, and could be a viable solution to effectively mitigate the temperature development, preventing potential disintegration due to the effects of delayed ettringite formation, strength reduction, or thermal cracking.
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Acknowledgments
The Florida Department of Transportation (FDOT) is gratefully acknowledged for providing the financial support that made this study possible (FDOT Project No. BDV31-977-07). The authors acknowledge the FDOT’s State Materials Office Pavement Materials Section staff for their assistance with data collection, materials testing, and technical advice.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 4 • April 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Feb 14, 2018
Accepted: Sep 13, 2018
Published online: Jan 26, 2019
Published in print: Apr 1, 2019
Discussion open until: Jun 26, 2019
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