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A platform for research: civil engineering, architecture and urbanism
Concrete Temperature Reduction via Voided Drilled Shafts
As the concrete in drilled shafts cures, extremely high internal temperatures can be generated (even when relatively small in diameter) giving rise to mass concrete conditions. When the concrete temperature exceeds safe limits, the concrete may not cure correctly and can ultimately degrade via delayed ettringite formation. Minimizing the peak temperature (and the associated defects) can be undertaken by casting the shafts without concrete in the core thereby removing a large amount of the energy producing material in a region that is least likely to benefit the structural capacity and that is less able to dissipate the associated core temperatures due to the presence of the more peripheral concrete. This paper presents the field temperature results of shafts cast under normal conditions and the surprisingly alarming findings. A numerical model was subsequently calibrated and used to show the tremendous potential for voiding shafts. Finally, construction issues that are likely to be encountered are summarized with possible solutions.
Concrete Temperature Reduction via Voided Drilled Shafts
As the concrete in drilled shafts cures, extremely high internal temperatures can be generated (even when relatively small in diameter) giving rise to mass concrete conditions. When the concrete temperature exceeds safe limits, the concrete may not cure correctly and can ultimately degrade via delayed ettringite formation. Minimizing the peak temperature (and the associated defects) can be undertaken by casting the shafts without concrete in the core thereby removing a large amount of the energy producing material in a region that is least likely to benefit the structural capacity and that is less able to dissipate the associated core temperatures due to the presence of the more peripheral concrete. This paper presents the field temperature results of shafts cast under normal conditions and the surprisingly alarming findings. A numerical model was subsequently calibrated and used to show the tremendous potential for voiding shafts. Finally, construction issues that are likely to be encountered are summarized with possible solutions.
Concrete Temperature Reduction via Voided Drilled Shafts
Johnson, K. (author) / Mullins, G. (author) / Winters, D. (author)
Geo-Denver 2007 ; 2007 ; Denver, Colorado, United States
2007-10-14
Conference paper
Electronic Resource
English
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