Effect of Formwork Characteristics on SCC Lateral Pressure
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 5
Abstract
Lateral pressure exerted on vertical formwork by fresh self-consolidating concrete (SCC) controls its design. Several factors, including material properties, placement conditions, and formwork characteristics, can affect formwork pressure. This paper presents the influence of formwork width (0.20–1.0 m), shape (circular versus square), and surface material (PVC, plywood, steel, and polyester filter membrane) of formwork on lateral pressure characteristics. The diameter of the pressure sensor used to evaluate lateral pressure characteristics is also investigated. The results showed that the increase in formwork width can increase the initial lateral pressure and delay the time needed for the formwork removal. Correction factors accounting for the changes in the formwork width on the initial pressure and pressure decay were developed. The formwork surface materials did show significant effect on initial formwork pressure, and different pressure decay responses were observed for each formwork material. The longest time for pressure cancellation was obtained for the steel formwork, and the shortest one for the polyester filter membrane.
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Acknowledgments
The authors would like to acknowledge the financial support of the National Ready-Mix Concrete Education Research Foundation and the Strategic Development Council (SDC) of the American Concrete Institute (ACI), and member companies of SDC.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 5 • May 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Mar 21, 2016
Accepted: Sep 20, 2016
Published online: Nov 28, 2016
Discussion open until: Apr 28, 2017
Published in print: May 1, 2017
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