Identification of test methods for determining wood guardrail post integrity.
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2015-06-01
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Abstract:Wood guardrail posts are subject to decay and deterioration, yet most DOTs have minimal or no
inspection procedures in place for wood guardrail posts. The objective of this study was to
identify nondestructive testing technologies to assess the condition of wood guardrail posts for
internal decay. The stress wave timing (SWT) technique was judged most promising, and a
prototype device was developed with an industrial partner. The prototype SWT device was
validated using wood guardrail posts removed from service. Internal conditions of the posts
were accurately detected in 86% of the specimens. The device also successfully detected the
internal condition of all posts inspected during a field test. An inspection procedure was
recommended for implementation using SWT in conjunction with drilling of posts that identified
as suspected decay.
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