Implementation of ODOT Tack Coat Technologies and Procedures to Improve Long-Term Pavement Performance
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2020-02-01
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Edition:Final
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Abstract:Using direct shear testing, this study quantified the impact of new emulsions from three companies on bond strength as compared to emulsions traditionally used in Oregon. Additionally, this study focuses on developing and implementing a more robust set of specifications and quality control (QC) provisions for tack coats. By improving upon and implementing the OreTackBond (formerly known as OFTT), a rigorous in-situ test for tack coat quality is validated for large-scale implementation as part of the highway construction inspection process. In this study, a wireless scale system that can be controlled from a tablet computer, (OreTackRate) was also developed to measure application rate accuracy and uniformity during construction. A field test procedure using OreTackRate was also developed to determine tack coat curing time to avoid tracking during construction. Using the OreTackRate system, a distributor truck certification and validation process was also developed. A construction surface cleanliness test (OreTackClean) and a test procedure were also developed in this study to reduce tracking and achieve more uniform tack coat distributions that will ultimately improve long-term tack coat performance. This study will advance the knowledge of engineered emulsion performance, usher in more precision in highway construction in Oregon and promote sustainability of the asphalt industry by creating pavement structures that meet or exceed their structural design lives by facilitating proper interlayer shear strength from well-controlled tack coat application.
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