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Acceptance Tests for Surface Characteristics of Steel Strands in Prestressed Concrete (2008) / Chapter Skim
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Appendix C - Specifications for Standard Surface Test Methods
Pages 123-128

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From page 123...
... Test Procedures 4.1 The procedure for preparation of each strand segment is described as follows: 4.1.1 Immerse the entire strand segment, or the portion to be tested, in saturated calcium hydroxide solution for 10 min. A P P E N D I X C Specifications for Standard Surface Test Methods 1 This device is commercially available as Cam Plus Micro contact angle meter manufactured by ChemInstruments, Inc., Fairfield, OH.
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From page 124...
... 4.2.5 Form a distilled water droplet at the tip of the syringe. Rotate the syringe barrel to form a droplet with a diameter of 7 units on the scale imprinted on the projection screen 4.2.6 Raise the pedestal holding the strand sample until the wire surface touches the water droplet, and then lower the pedestal until the water droplet is released from the syringe needle.
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From page 125...
... 2.4 Desiccator -- A glass desiccating chamber shall use granular calcium chloride desiccant and a ceramic disk insert on which to rest strand segments and to separate samples from desiccant. The chamber shall have sufficient volume to accommodate at least three strand segments.
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From page 126...
... Proposed Standard Test Method for Change in Corrosion Potential of Steel Strand Scope 1.1. This test method covers the estimation of change in the electrochemical corrosion potential of prestressed strands in de-ionized water, for the purpose of indirectly estimating the bond performance of prestressing strand in concrete.
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From page 127...
... Keywords 12.1 Corrosion potential, strand, reference electrode. Proposed Standard Test Method for Identification and Quantification of Residue on Steel Strand by Extraction, Gravimetric, and Spectroscopical Analyses Scope 1.1 The test methods for identification and quantification of organic drawing-compound residues on strand surfaces are based on solvent extraction procedures, together with gravimetric and Fourier transform infrared spectroscopy (FTIR)
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From page 128...
... 4.1.6 Carefully transfer solvent to the glass separatory funnel that contains the acidic solution. Rinse strand sample over glass cylinder with about 20 mL of chloroform, swirl solvent in glass cylinder, and pour rinse solvent into same separatory funnel.
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Key Terms

  • strand segment
  • test method
  • strand sample
  • test portion
  • hydrochloric acid

  • steel strand
  • glass cylinder
  • water droplet
  • strand segments
  • bond stress

  • corrosion potential
  • calcium hydroxide
  • projection screen
  • standard test
  • wire surface

  • proposed standard
  • accepted reference
  • reference material
  • acid solution
  • extraction residue

  • conducted tests
  • properly conducted
  • establish appropriate
  • appropriate safety
  • separatory funnel

  • strand surface
  • glass separatory
  • distilled water
  • angle meter
  • reference electrode


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