Development of surface friction guidelines for LADOTD : research project capsule.
-
2011-02-01
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Edition:Research project capsule.
-
Corporate Publisher:
-
Abstract:The current friction guideline of the Louisiana Department of
Transportation and Development (LADOTD) for a wearing course mixture
design deals with the polished stone value (PSV) of coarse aggregate
(which is a relative British Pendulum skid-resistance number measured
on polished stones). The basic assumption is that the aggregates with
a high PSV will automatically provide high friction or skid resistance
for a wearing course mixture. However, the fi eld measurement on skid
resistance sometimes does not necessarily support such an assumption.
In fact, there are many parameters that may aff ect the friction resistance
of a wearing course mixture, and the polished stone value is just one
of these parameters. The National Cooperative Highway Research
Program (NCHRP) Project 1-43: Guide for Pavement Friction examined
several friction-infl uential parameters related to a mixture design.
Among them include mixture type, surface textures (micro- and macrotextures),
polished stone value and other aggregate properties, and
binder properties. Obviously, the use of only polish stone values of
coarse aggregates would have somewhat clouded the fundamental
issues related to skid resistance. In addition, since very limited highly
skid-resistant aggregates are locally produced in Louisiana, such friction
guidelines tend to screen out locally available materials by requiring
the imported highly skid-resistant aggregates in a wearing course
construction, which is usually not cost-eff ective. Therefore, there is a
need to re-examine the current friction guidelines and develop new
guidelines in which more frictional characteristics (such as micro- and
macro-textures) can be considered in a wearing course mixture design.
Ideally, the new guidelines will allow more locally available aggregates to
be used in a wearing course mixture.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
File Type:
Supporting Files
-
No Additional Files
More +