United States Department of Transportation
i
Effects of temperature segregation on the volumetric and mechanistic properties of asphalt mixtures : research project capsule.
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2015-02-01
[PDF-269.61 KB]
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Abstract:Material segregation in asphalt mixtures is a non-uniform distribution of coarse
and fine aggregates through its masses, i.e., concentration of coarse materials
in some area and fine materials in others. During construction, the coarse and
fine asphalt mixtures may cool at different rates, at different locations, causing
temperature segregation (or temperature differentials). Excessive temperature
differentials within a mat of uncompacted asphalt mixtures can cause variations
in the density levels of the finished pavements due to the inconsistent
compaction at different temperatures. A lack of density in the cooler areas of the
pavement can cause premature deterioration of those pavement areas such as
moisture damage, fatigue, cracking, rutting, raveling, pothole, etc. Therefore, it
is essential to ascertain the effects of temperature segregation on the quality of
asphalt mixtures as measured by their densification and mechanical properties
of asphalt mixtures in Louisiana in order to improve the initial quality and the
long term performance of its asphalt pavements. The pavement surface thermal
profile during construction will be measured using a paver-mounted infrared (IR)
bar known as PAVE-IR system commercially available from MOBA Corporation.
This profile will be used to ascertain the effect of temperature segregation on
the quality of asphalt mixtures as defined by measurements of density and
mechanistic properties.
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