United States Department of Transportation
i
Improving the use of crack sealing to asphalt pavement in Louisiana : research project capsule : technology transfer program.
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2016-10-01
[PDF-211.67 KB]
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Abstract:Pavement performance
depends on the effectiveness
and timeliness of
maintenance efforts.
Deferred maintenance
increases the severity of
distresses and leads to a more
rapid decline of a pavement’s
condition. An effective
maintenance program delays
deterioration and corrects
pavement deficiencies.
Crack sealing (or filling) can
keep water from entering
the pavement structure, thus
preventing the weakening of
the pavement and delaying its deterioration. Years of service life may be added
to the pavement at a relatively low cost, assuming that an appropriate sealant
material is correctly installed at the right time in the pavement life. Various
studies have demonstrated the cost effectiveness of crack sealing.
The use of crack sealing in Louisiana has been limited since studies conducted
in the 1960s showed that the performance of this maintenance practice can be
affected by high groundwater table conditions. According to these studies, crack
sealing can prevent water from escaping through the cracks, causing accelerated
stripping of the asphalt concrete.
It seems intuitive that any impermeable treatment on top of a pavement with
high groundwater table may cause the same problem. However, after more than
50 years since the original studies, it is unclear if the same conditions still exist
and whether current construction practices affect the findings from those studies.
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