United States Department of Transportation
i
Evaluation of Louisiana's maintenance chip seal and micro-surfacing program.
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2002-07-01
[PDF-5.03 MB]
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Abstract:This report focuses valuation of Louisiana DOTD's chip seal and micro-surfacing treatments. The report discusses the performance in terms of Pavement Condition Index (PCI) of 40 chip seal and 24 micro-surface projects after approximately 52 months of service throughout the state. The evaluation is based on three separate subjective visual distress surveys and ARAN measured distress on cracking, roughness, and rutting. Sections vary in age from 41 months to 63 months.
The analysis indicated that the median PCI (Pavement Condition Index) of chip seal and micro-surface sections is about 75 and 85, respectively, after about 52 to 60 months of service. Based on the last PCI, about 70 percent of the chip seals were in good condition. Likewise, most of the micro-surface sections are in good to excellent condition.
The effect of pavement condition on PCI, prior to treatment application, was not evident from the distress data measured by ARAN equipment.
Chip seal sections showed bleeding in 70 percent of the sections. This bleeding was due to combination of factors relative to loss of aggregate, additional embedment and/or excess asphalt. However, most skid numbers are still in the safe range. The friction numbers on micro-surface sections have deteriorated considerably mainly due to the type of aggregates used in the mix.
Continued survey to end of service life of these sections is recommended to determine their service life and cost-effectiveness.
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