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Development of Procedures and Technologies for Chip Seal Construction Quality Control in Oregon
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2025-02-01
[PDF-36.69 MB]
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Abstract:Given budget constraints and increasing traffic in Oregon, chip seals have emerged as a cost-effective and practical approach for maintaining and preserving the existing highway network. This study focused on establishing efficient Quality Assurance (QA) procedures for chip seals, aligning with SPR777's design method to increase the performance and longevity of chip seals in Oregon. Modified sweep and pull-off tests were developed and complemented by Vialit tests to assess the adhesion properties between the aggregate and the binder. Subsequently, laboratory tests were conducted using aggregates and emulsions sampled from two construction projects. The results were compared to identify the most effective and practical test method, utilizing the correlation of the obtained results. Using the recommended test methods, the effect of dust and surface moisture on aggregate retention performance was evaluated. Moreover, the study reports the aggregate retention performance of four different aggregates from various Oregon regions using the two most commonly used emulsions. A laboratory bleeding test using the Hamburg Wheel Tracking Test device was also developed. The aggregate retention and bleeding performance of RAP were examined. The OreTackRate, developed in SPR 818, was tested in chip seal construction for in-situ emulsion application rate measurement. To assess the bleeding susceptibility of chip seals in situ, macro texture measurements were taken using the developed laser texture scanner, sand patch test, and high-speed profiler, both before and immediately after the completion of chip seal construction. The obtained results were correlated, and an MPD-MTD correlation was established. The test methods and the QA processes developed and proposed for implementation in this study are expected to enhance the performance of chip-seal surfaced roadways in Oregon.
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