Two test sections of 30-in-diameter (76 cm) reinforced plastic mortar (RPM) pipe were installed to replace two deteriorated open irrigation laterals. Twenty-nine 20-ft (6.1 m) sections of pipe were placed in one section in a dry trench with five different types of bedding. Pipe deflections were measured at four different times during the 16 months after installation. Results showed the following average initial vertical pipe deflections: (a) well-compacted material, 1 percent; (b) puddled natural earth, 4 percent; (c) loose sand, 6 percent; and (d) loose natural earth, 8 percent. Thirty 20-ft (6.1 m) pipe lengths were placed in the other section in a wet and unstable subgrade. Deflections of the bell end,spigot end, and center of the pipe were measured at 2, 5, and 12 months after installation. Results showed that the average initial vertical deflections were 0.7 percent at the spigot end, 1 percent at the bell end, and 2.3 percent at the center of the pipe. These field tests indicate that RPM pipe will deflect less than 5 percent if it is installed according to U.S. Bureau of Reclamation specifications.

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 39-48
  • Monograph Title: Geometric highway and culvert design
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00095582
  • Record Type: Publication
  • ISBN: 0309023637
  • Report/Paper Numbers: #516
  • Files: TRIS, TRB
  • Created Date: Jul 2 1975 12:00AM