CONTRACTION AND EXPANSION JOINTS

THE SPACING OF CONTRACTION CRACKS (IF NO JOINTS ARE USED) DEPENDS PRIMARILY UPON THE TENSILE STRENGTH OF THE CONCRETE AND THE COEFFICIENT OF FRICTION BETWEEN THE SLAB AND SUBGRADE. IN DESIGNING JOINT SPACING TO ELIMINATE CRACKS, THESE FACTORS MUST BE EVALUATED ACCORDING TO THE PREVAILING TEMPERATURE CONDITINS AND PROBABLE SMOOTHNESS OF SUBGRADE. A MINIMUM SPACING OF CONTRACTION JOINTS TO PREVENT CRACKS FORMING DURING THE FIRST 24 HOURS AFTER PLACING ON AN AVERAGE SUBGRADE IS SHOWN THEORETICALLY TO BE ABOUT 37.5 FEET. THE AFFECTS OF LONGITUDINAL STEEL AND SUBGRADE SETTLEMENT ON JOINT SPACING AND THE THEORY FOR THICKNESS OF EXPANSION JOINTS ARE ALSO DISCUSSED.

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/hrbproceedings/8/8-016.pdf
• Supplemental Notes:
  • Vol 8, pp 162-170, 4 FIG, TAB. 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:
  • Goldbeck, A T
• Publication Date: 1929

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the Eighth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 13-14, 1928
• Serial:
  • Highway Research Board Proceedings
  • Volume: 8
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Coefficient of friction; Concrete; Concrete pavements; Contraction joints; Cracking; Expansion joints; Longitudinal reinforcement; Pavement design; Pavements; Settlement (Structures); Slabs; Smoothness; Spacing; Subgrade (Pavements); Temperature; Tensile strength; Thickness
• Uncontrolled Terms: Concrete cracking; Pavement thickness
• Subject Areas: Highways; Pavements;

Filing Info

• Accession Number: 00205815
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jul 18 1971 12:00AM