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2022 Summary of Special Pavement Test Sections
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2022-09-01
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[PDF-6.15 MB]
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Edition:Special Report
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Abstract:WSDOT continued to collect rutting/wear and smoothness information on a number of completed studies. This report summarizes those studies. • Open Graded Friction Courses: OGFC-AR on I-405 was more susceptible to wear than either OGFC-SBS or HMA matching the pattern seen in the I-5 and SR-520 quieter pavement test sections. • Concrete Performance and Wear. The I-82 next generation concrete surface (NGCS) sections are showing slightly more wear than the adjacent diamond ground PCC pavement after nine years of traffic. The longitudinal tining section on I-90 is currently showing slightly more wear than the adjacent diamond ground concrete; however, the difference is insignificant given the higher traffic on the longitudinal tined section. The wear on the I-90 polyester polymer concrete is similar but slightly higher than wear in the adjacent diamond ground concrete after seven years of traffic. The higher design flexural strength mixes for the SR-395 SPS-2 rigid pavement sections were the most resistant to studded tire wear. PCC paved on permeable asphalt treated base or dense graded aggregate base exhibited the best performance over lean concrete base. The I-90 Argonne to Sullivan Road project results have some similarities to the sections on SR-395. The I-90Lanes 1 and 3 (which had lower traffic) results are similar but a bit higher than the wear rates associated with the lower strength sections on SR-395. For the high traffic I-90 Lane 2, the range is higher due to the higher studded tire traffic. The findings in this report continue to influence policy decisions that are documented in WSDOT’s Pavement Policy.
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