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Title: Salt Damage in Wood: Controlled Laboratory Exposures and Mechanical Property Measurements

Source: Wood and Fiber Science

Author(s)Kirker, Grant T.; Brischke, Christian ; Passarini, Leandro ; Zelinka, Samuel L.

Publication Year: 2020  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4716-1A   FPL-4723-3A

Abstract: Salt damage in wood can be recognized by its stringy appearance and is frequently observed in wood used in maritime structures and buildings built near the ocean. Whereas salt-damaged wood is common, little is known about the mechanism by which salt water alters the wood structure. There is no information on the effects of salt damage on the mechanical properties of wood. In this study, a laboratory method for creating salt damage in other porous materials was applied to wood. Wood pillars were placed in a reservoir of 5 M NaCl and exposed to a 40% RH environment. Capillary action pulled the salt water to the upper part of the pillars which were dry. Large deposits of effloresced salts were observed. The changes in mechanical properties caused by salt were measured by the high-energy multiple impact (HEMI) test. Salt damage caused a reduction in the resistance to impact milling (RIM) of 6.5%, and it was concluded that salt damage causes only minor effects on the strength of wood. The tests were not conclusive as to the exact mechanism of salt damage in treated wood. However, diffusion of mineral ions through the cell wall was found to be a key step in the salt damage mechanism.

Keywords: Defibrillation; salt water; chemical modification; wood damage mechanisms; resistance to impact milling (RIM)

Publication Review Process: Formally Refereed

File size: 774 kb(s)

Date posted: 03/12/2020

This publication is also viewable on Treesearch:  view
RITS Product ID: 97264
Current FPL Scientists associated with this product (listed alphabetically)
Kirker, Grant
Research Forest Products Technologist
Zelinka, Samuel L.
Materials Research Engineer

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