Development of a test method for assessing water repellency and derived physical stability of preservative systems for railroad ties Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/pk02cd03b

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Resistance to moisture uptake is an important attribute of some wood preservatives and can help reduce moisture cycling that leads to the development of deep checks. While the potential for preservative treatments to help improve wood/moisture interactions is acknowledged, there are no tests that specifically evaluate this performance parameter. Checking is a particularly important issue for railroad ties and often causes tie failures. A number of new wood preservatives have recently become available on the tie market and it would be useful to have a standardized test method that compares water repellency and derived physical stability of these preservatives. The objective of this study was to develop one such test method. The role of water repellency on dimensional stability was examined using non-treated and creosote-treated red oak, white oak and black gum samples exposed to 3-4 wet/dry cycles. Dimensional stability was assessed by measuring two checking variables - counting the number of checks on the outer most tangential surface and measuring the area of the largest check on the same surface. Check frequency tended to increase with moisture cycling, while largest check area provided a less consistent measure of dimensional change. Creosote treatment did not significantly enhance dimensional stability compared to non-treated samples as measured by check frequency. Water repellency of non-treated, creosote-treated and copper naphthenate-treated samples was assessed by water droplet contact angle. Creosote treatment significantly improved water repellency, but copper naphthenate-treated samples did not differ significantly from non-treated controls. Although creosote treatment did not substantially affect check development, increased water repellency provided by the preservative would likely reduce check development for railroad ties in service by preventing them from reaching the elevated moisture levels necessary for checking to occur.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Keyword
Subject
Rights Statement
Peer Reviewed
Language
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2014-10-27T16:29:46Z (GMT) No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) BeckHaroldG2014.pdf: 12160342 bytes, checksum: 1f67dd2449ddbf98354e6f4d3709fc49 (MD5)
  • description.provenance : Made available in DSpace on 2014-10-27T16:29:46Z (GMT). No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) BeckHaroldG2014.pdf: 12160342 bytes, checksum: 1f67dd2449ddbf98354e6f4d3709fc49 (MD5) Previous issue date: 2014-09-22
  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2014-10-27T16:07:18Z (GMT) No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) BeckHaroldG2014.pdf: 12160342 bytes, checksum: 1f67dd2449ddbf98354e6f4d3709fc49 (MD5)
  • description.provenance : Submitted by Harold Beck (beckha@onid.orst.edu) on 2014-10-27T12:55:51Z No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) BeckHaroldG2014.pdf: 12160342 bytes, checksum: 1f67dd2449ddbf98354e6f4d3709fc49 (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items