A STUDY OF SPLICES IN TENSILE REINFORCING BARS

DATA WERE COLLECTED FOR AN EVALUATION OF MECHANICAL SPLICES IN TENSILE REINFORCING BARS BY COMPARISON WITH LAP OR BUTT- WELDED SPLICES. A SERIES OF CONTROL BARS /CONTINUOUS BARS/ OF VARIOUS SIZES AND YIELD STRENGTH WERE TESTED. TWO SAMPLES OF EACH BAR SIZE AND STEEL GRADE OF THE BUTT-WELDED BARS WERE TESTED. THESE RESULTS WERE COMPARED WITH THE OTHER SPLICING DEVICES. SLEEVES FILLED WITH EPOXY AND SLEEVES FILLED WITH EXPANDED CEMENT GROUT WERE ALSO STUDIED. THE BUTT-WELDED SPLICES GAVE WIDE VARIATION IN TEST RESULTS AND EXTREME COSTS OF THE TECHNIQUE LED TO THE CONCLUSION THAT IN THE CASE OF ASTM A 432 BARS THE METHOD WAS NOT SATISFACTORY. UNDER IDEAL WELDING CONDITIONS, ASTM A 15 AND A 408 BUTT-WELDED SPLICES MAY BE ACCEPTABLE. THE SLEEVE-WITH -METAL-FILLER CONNECTION WAS FOUND TO EQUAL THE ULTIMATE STRENGTH OF BOTH 40-KSI AND 60-KSI NOMINAL YIELD STRENGTH BARS. A VERY DEFINITE ADVANTAGE OF THIS TYPE CONNECTION IS THAT ITS QUALITY CAN BE ASCERTAINED WITH ACCURACY BY VISUAL INSPECTION. THE EXOTHERMIC SPLICES DO NOT APPEAR TO POSSESS THE HIGH RELIABILITY OF THE SLEEVE-WITH-METAL-FILLER CONNECTION, BUT THE EXOTHERMIC CONNECTIONS DID GIVE REASONABLE AVERAGE VALUES OF MAXIMUM STRESS. A DEFINITE DISADVANTAGE OF THIS TYPE OF CONNECTION APPEARS TO BE ITS IMMUNITY FROM ACCURATE VISUAL INSPECTION. EPOXY NO. 1, NO. 2, NO. 3 AND EXPANDED GROUT SPLICES APPEAR TO BE TOTALLY INADEQUATE AND SHOULD NOT BE USED FOR TENSILE SPLICING OF REINFORCING BARS UNLESS THE LENGTH OF THE SPLICING SLEEVE IS SIGNIFICANTLY INCREASED COMPARED WITH THE SLEEVE USED IN THE METAL-FILLED SLEEVE SPLICE.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1966/147/147-006.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Concrete Superstructures and presented at the 45th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Segner Jr, E P
• Publication Date: 1966

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: No 147, pp 89-115, 59 FIG, 2 TAB,
• Monograph Title: Bridges and structures
• Serial:
  • Highway Research Record
  • Issue Number: 147
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Alternatives analysis; Bars (Building materials); Butt welds; Cement grouts; Data collection; Earthwork; Epoxides; Evaluation; Material reinforcement; Metals; Sleeves (Electricity); Splicing; Tensile properties
• Uncontrolled Terms: Lap splices; Tensile
• Old TRIS Terms: Epoxy; Exothermic splices; Sleeves
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00208230
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Dec 22 1994 12:00AM