Cracking Behavior of Posttensioning Grout with Various Strand-to-Duct Area Ratios
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 6
Abstract
This study investigates the effect of the strand-to-duct area ratio on the shrinkage cracking behavior of posttensioning grout. The free shrinkage behavior of grout was evaluated using various duct diameters. Test results indicated that the expansion and shrinkage strains of grout increased with the duct diameter. The strain of a restrained strand was barely affected by the number of strands but was significantly affected by the strand-to-duct area ratio. The specimen with a strand-to-duct area ratio greater than 0.3 showed shrinkage cracks in fewer than 30 days. Increasing the strand-to-duct area ratio shortened the cracking time. All the test specimens showed bleeding immediately after pumping, along with air void pockets in the grout.
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Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2012R1A2A1A05026406) and carried out as part of a strategic research project (Development of smart prestressing system for prestressed concrete bridges) funded by the Korea Institute of Construction Technology.
References
Asamoto, S., Ohtsuka, A., Kuwahara, Y., and Miura, C. (2011). “Study on effects of solar radiation and rain on shrinkage, shrinkage cracking and creep of concrete.” Cem. Concr. Res., 41(6), 590–601.
ASTM. (2007). “Standard test method for flow of hydraulic cement mortar.”, West Conshohocken, PA.
ASTM. (2008). “Standard test method for length change of hardened hydraulic-cement mortar and concrete.”, West Conshohocken, PA.
ASTM. (2010). “Standard test method for expansion and bleeding of freshly mixed grouts for preplaced-aggregate concrete in the laboratory.”, West Conshohocken, PA.
ASTM. (2011). “Standard test method for splitting tensile strength of cylindrical concrete specimens.”, West Conshohocken, PA.
British Standards Institution (BSI). (2007). “Grout for prestressing tendons–test methods.”, London.
Choi, Y., and Yuan, R. L. (2005). “Experimental relationship between splitting tensile strength and compressive strength of GFRC and PFRC.” Cem. Concr. Res., 35(8), 1587–1591.
Federal Highway Administration (FHWA). (2008). “Construction of a precast prestressed concrete pavement demonstration project on interstate 57 near Sikeston, Missouri—Chapter 4. Design.”, 〈http://www.fhwa.dot.gov/pavement/concrete/pubs/hif08009/s04.cfm〉 (Nov. 1, 2013).
Hansen, B. (2007). “Forensic engineering: Tendon failure raises questions about grout in post-tensioned bridges.” Civ. Eng. News, 77(11), 17–18.
Japan Concrete Institute (JCI). (1999). Autogenous shrinkage of concrete, E. Tazawa, ed., E&FN Spon, London.
Japan Society of Civil Engineers (JSCE). (2001). Standard specification for concrete structures on maintenance, Tokyo, Japan.
Korea Concrete Institute (KCI). (2009). Standard specification for concrete, Seoul, Korea.
Korean Standard Association (KSA). (2009). “Hydraulic-cement grout(nonshrink).”, Seoul, Korea.
Korean Standard Association (KSA). (2010). “Standard test method for compressive strength of mortar grouting.”, Seoul, Korea.
Korean Standard Association (KSA). (2014). “Standard test method for bleeding and expansion ratios of grouting mortar.”, Seoul, Korea.
Korea Road and Transportation Association (KRTA). (2010). Korea highway bridge design code, Seoul, Korea.
Kwon, S. H., Ferron, R. P., Akkaya, Y., and Shah, S. P. (2007). “Cracking of fiber-reinforced self-compacting concrete due to restrained shrinkage.” Int. J. Concr. Struct. Mater., 6(3), 135–144.
Machida, S., and Durelli, A. J. (1973). “Response of a strand to axial and torsional displacements.” J. Mech. Eng. Sci., 15(4), 241–251.
Pielstick, B. (2002). “Grouting of segmental posttensioned bridges in America.” Transportation Research Record 1813, Transportation Research Board, Washington, DC, 235–241.
Pillai, R. G., Gardoni, P., Trejo, D., Hueste, M. D., and Reinschmidt, K. (2010). “Probabilistic models for the tensile strength of corroding strands in post-tensioned, segmental concrete bridges.” J. Mater. Civ. Eng., 967–977.
Post-Tensioning Institute (PTI) Grouting Specifications Committee. (2003). “Specification for grouting of post-tensioned structures.” PTI guide specification, PTI Grouting Specifications Committee, Farmington Hills, MI.
Ranade, R. R., Li, V. C., Stults, M. D., Heard, W. F., and Rushing, T. S. (2013). “Composite properties of high-strength and high-ductility concrete.” ACI Mater. J., 110(4), 413–422.
Raoufi, K., and Weiss, W. J. (2012). “Corrosion and service life estimates for internally cured concrete.”, Farmington Hills, MI, 1–16.
Schokker, A. J., Breen, J. E., and Kreger, M. E. (2001). “Grouts for bonded post-tensioning in corrosive environments.” ACI Mater. J., 98(4), 296–305.
Trejo, D., Pillai, R. G., Hueste, M. D., Reinschmidt, K., and Gardoni, P. (2009). “Parameters influencing corrosion and tension capacity of post-tensioning strands.” ACI Mater. J., 106(2), 144–153.
Woodward, R. (2001). “Durability of post-tensioned tendons on road bridges in the U.K.” Durability of Post-Tensioning Tendons, 1–10.
Yoo, D. Y., Park, J. J., Kim, S. W., and Yoon, Y. S. (2014a). “Combined effect of expansive and shrinkage-reducing admixtures on the properties of ultra high performance fiber-reinforced concrete.” J. Comp. Mater., 48(16), 1981–1991.
Yoo, D. Y., Park, J. J., Kim, S. W., and Yoon, Y. S. (2014b). “Influence of reinforcing bar type on autogenous shrinkage stress and bond behavior of ultra high performance fiber reinforced concrete.” Cem. Concr. Comp., 48(4), 150–161.
Yoo, D. Y., Shin, H. O., Yang, J. M., and Yoon, Y. S. (2014c). “Material and bond properties of ultra high performance fiber reinforced concrete with micro steel fibers.” Comp. Part B: Eng., 58(3), 122–133.
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 6 • June 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 3, 2013
Accepted: Jun 25, 2014
Published online: Aug 18, 2014
Discussion open until: Jan 18, 2015
Published in print: Jun 1, 2015
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