Structures Congress 2019
Combined Effect of Expansive Cement and Internal Curing to Mitigate Shrinkage Cracking in Bridge Decks
Publication: Structures Congress 2019: Bridges, Nonbuilding and Special Structures, and Nonstructural Components
ABSTRACT
Concrete cracking due to restrained drying shrinkage is a widespread problem that could happen to any structural element including bridge decks. One of the main causes of bridge deck cracking is the development of tensile stresses due to restrained drying shrinkage. Cracks allow harmful substances such as water and deicing salts to penetrate the deck and initiate corrosion. This research investigates the effects of using lightweight aggregate (LWA) on enhancing the performance of expansive Type-K cement. Four large-scale bridge decks of 2 m×3 m were built using four different types of concrete mixtures: (1) a mixture containing 100% Portland cement, (2) a mixture incorporating expansive Type-K cement, (3) a mixture containing internally cured fine lightweight aggregate (LWA), and (4) a combined mixture of Type-K cement and internally cured LWA. The combined mixture uses internal water from LWA to enhance the expansion of Type-K cement and produce compressive stress in the concrete; and eventually reduces the onset of cracking.
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ACKNOWLEDGEMENT
This work was supported by the Illinois Department of Transportation (IDOT) through the Illinois Center of Transportation (ICT). This publication is based on some of the results of ICT-R27-88, Bridge Decks: Mitigation of Cracking and Increased Durability. This research was conducted in cooperation with the Illinois Center for Transportation; the Illinois Department of Transportation, Office of Program Development; and the US Department of Transportation, Federal Highway Administration. This support is gratefully acknowledged. Acknowledgements are also in order for Saint Louis University (SLU) for internal financial support. The opinions and findings of this paper are those of the authors and not necessarily those of the sponsors.
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Published In
Structures Congress 2019: Bridges, Nonbuilding and Special Structures, and Nonstructural Components
Pages: 50 - 56
Editor: James Gregory Soules, McDermott International
ISBN (Online): 978-0-7844-8223-0
Copyright
© 2019 American Society of Civil Engineers.
History
Published online: Apr 22, 2019
Published in print: Apr 22, 2019
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