Acceptance Tests for Surface Characteristics of Steel Strands in Prestressed Concrete (2008) / Chapter Skim
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program is needed to rapidly assess factors that are known to affect bond properties. Background to Strand Bond Uncertainty Tests conducted in the early 1980s on uncoated and epoxycoated steel strands found that the measured transfer and development lengths of the uncoated strands were in excess of lengths computed using the equation found in the AASHTO standard specifications.
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A more complete description of the history of strand bondrelated research is given in Appendix A Manufacture and Surface Condition of Prestressing Strand The production of prestressing strand, as observed at one manufacturing facility, includes the following basic components (Figure 1)
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5I II Figure 1. Schematic of strand manufacturing process.
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These lubricants are compounds made from sodium hydroxide or calcium hydroxide and a fatty acid (stearic acid) in combination with additives to impart special properties to the lubricant.
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. Prior to about 20 years ago, residual films and possibly other organic residues on prestressing strand that may have been detrimental to bond with the concrete were burned off during the stress-relieving operation (Preston and Sollenberger 1967)
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The following appendices have been written to provide more background and additional details of this work. These include Appendix A - Review of Strand Bond Literature Appendix B - Evaluation of Mechanical and Chemical Test Methods Appendix C - Specifications for Standard Surface Test Methods Appendix D - Supplemental Investigations of Strand Bond Appendix E - Bibliography of Strand Bond 8
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