Development of surface friction guidelines for LADOTD : tech summary.
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2012-04-01
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Abstract:The current Louisiana Department of Transportation and Development (LADOTD) surface friction guidelines deal with the polished
stone values (PSV) of coarse aggregates (which is a relative British Pendulum skid-resistance number measured on polished stones).
The basic assumption is that coarse aggregates with high PSV values will automatically provide suffi cient surface friction for a wearing
course mixture. However, the fi eld measurement on friction resistance sometimes does not necessarily support such an assumption.
In fact, there are many variables/parameters that may aff ect pavement surface friction resistance, and the PSV is just one of them. The
use of only PSV of coarse aggregates has somewhat clouded the fundamental issues related to skid resistance of a pavement surface.
In addition, since very limited highly friction-resistant aggregates are locally produced in Louisiana, such friction guidelines will often
tend to screen out locally available materials by requiring the imported highly friction-resistant aggregates in a wearing course, which
may not be cost-eff ective.
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