Abstract
The use of self-consolidating concrete (SCC) has become more prevalent due to its economic and technological advantages over other types of concrete. Nevertheless, issues relating to casting and placement hinder its widespread use. One of the primary concerns of using SCC is related to its high formwork pressure, which affects any type of structural element, whether it is precast or cast on site. This study aimed to make correlations between different parameters obtained through slump flow and shear rheological tests in order to determine what the implication would be on the evolution of formwork pressure for five typical precast SCC mixes. The parameters were slump flow diameter, spreading rate, yield stress, plastic viscosity, and rate of structural rebuilding (stress relaxation). In addition, the advantages, from the point of view of cost and safety, of incorporating nanoclays and viscosity-modifying admixtures in SCC to reduce initial pressure and increase rate of pressure drop to optimize the formwork design were demonstrated.
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Acknowledgments
The work reported was supported by the research projects BIA2009-13056 and PII2I09-0129-4085 from the Ministerio de Economía and Competitividad and the Junta de Comunidades de Castilla-La Mancha, Spain. The authors also wish to express their gratitude to Shiho Kawashima, assistant professor at Columbia University, and Mohend Chaouche, research director at CNRS (France).
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Journal of Materials in Civil Engineering
Volume 27 • Issue 7 • July 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jan 18, 2014
Accepted: Jul 16, 2014
Published online: Aug 25, 2014
Discussion open until: Jan 25, 2015
Published in print: Jul 1, 2015
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