LABORATORY INVESTIGATION OF THE HOLDING POWER OF NAILS IN TREATED AND UNTREATED OPEN TOP FLOOR DECKING

Tests were conducted to determine whether the holding power of nails used in the blocking and bracing of shipments in open top equipment was affected by the application treatment of various types of preservatives to the floor decking. The review indicates the preservative does not affect holding power of nails used for blocking and bracing on such deckboards. The holding power will vary for different species of lumber; with the denser lumber having a greater holding power. This work was conducted using Douglas fir (coast type) and the values of withdrawal loads would have to be adjusted in accordance with the wood density of other types of deckboard. The original destination car report indicated a condition where the car decking was evidently saturated with some oily substance causing the nails to be lubricated with resultant reduction in holding power. In contrast, the floor decking materials in this study were chemically treated under commercial conditions. It is estimated that any extreme service condition, such as oil saturation of the decking boards, would equally affect all of the types of treatments considered in this report. From analysis of the results it is concluded that the nail holding power in deckboards used in open top car service when properly treated with pentachlorophenol, creosote, cresosote-coal tar mix, or Wolman salts compares favorably with untreated decking lumber in nail holding ability for the same type and size of nail.

Media Info

  • Features: Figures;
  • Pagination: 10 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00097259
  • Record Type: Publication
  • Source Agency: Association of American Railroads
  • Report/Paper Numbers: MR-445
  • Files: TRIS
  • Created Date: Jul 29 1975 12:00AM