摘要 :
This document compiles recent research findings related to corrosion of metals in preservative treated wood into a single report on corrosion of metals in wood. The research was conducted as part of the Research, Technology and Ed...
展开
This document compiles recent research findings related to corrosion of metals in preservative treated wood into a single report on corrosion of metals in wood. The research was conducted as part of the Research, Technology and Education portion of the National Historic Covered Bridge Preservation (NHCBP) Program administered by the Federal Highway Administration. The compilation addresses: corrosion rates of metals embedded in treated wood, the mechanism of corrosion in treated wood, the effect of extractives on corrosion, methods for predicting the service life of metals in treated wood, and suitable non-metallic replacement fasteners. The document was created to serve as a desk reference for engineers to aid in materials selection when building with treated wood.
收起
摘要 :
With the voluntary withdrawal of wood treated with chromated copper arsenate (CCA) for use in residential construction in January 2004, the corrosiveness of treated wood has become a concern. Preliminary research has shown the rep...
展开
With the voluntary withdrawal of wood treated with chromated copper arsenate (CCA) for use in residential construction in January 2004, the corrosiveness of treated wood has become a concern. Preliminary research has shown the replacements for CCA, which include copper azole (CuAz) and alkaline copper quaternary (ACQ) are more corrosive than CCA. Since rapid tests cannot easily be run in solid wood, an electrochemical method has been developed that measures the corrosiveness of water-extracts of wood. Corrosion rates of steel and galvanized steel fasteners measured in the extract of ACQ treated wood correlate well with gravimetric data in solid wood.
收起
摘要 :
Although preservative treatments prolong the life of wood, they can also accelerate the corrosion of fasteners. This is an issue that needs to be studied because corrosion of building materials and fasteners can negatively affect ...
展开
Although preservative treatments prolong the life of wood, they can also accelerate the corrosion of fasteners. This is an issue that needs to be studied because corrosion of building materials and fasteners can negatively affect system performance. In this study, the test methods of twenty publications and one standard that examine the corrosion of metals in contact with wood are summarized and reviewed so that a comparison of their effectiveness can be made. While the focus is on the test methods, some qualitative results from these different methods are discussed to show nuances of the test method. Also, this literature review is intended to focus future research towards the use of the most promising test methods and eliminate overlap in research efforts.
收起
摘要 :
This study reviewed the literature on static and impact withdrawal of nails driven into the end grain of wood members. From this an empirical relationship was created relating the specific gravity of the wood, the diameter of the ...
展开
This study reviewed the literature on static and impact withdrawal of nails driven into the end grain of wood members. From this an empirical relationship was created relating the specific gravity of the wood, the diameter of the nail, and the depth of penetration of the nail to the static withdrawal capacity of nails driven into the wood and withdrawn immediately. Areas of additional research are identified for end-grain nailing in wood members.
收起
