Application of ultrathin asphalt overlay technology with 4.75-mm nominal maximum aggregate size

DOI

10.2991/978-94-6463-336-8_16How to use a DOI?

Keywords

preventative maintenance; ultra-thin asphalt overlay; bond property; water stability; rutting test; skid resistance; aggregate gradation

Abstract

Ultra-thin asphalt overlay (UAO), described as an ultrathin overlay, is formulated of hot-mix asphalt placed on a polymer-modified asphalt emulsion tack coat. The total wearing surface thickness of UAO ranges from 5 mm to 15 mm, ensuring thorough waterproofing of the pavement and high skid resistance. This study focused on the constructability and performance of UAO treatments with three aggregate types, including open-graded, half-open-graded, and dense-graded. Special specimens are made for laboratory tests to compare the performance of UAOs, all laboratory results, trial sections survey, and core samples tests are consistent with the previous laboratory tests. UAO treatment with half open-graded aggregate does best on mechanical performance and open-graded aggregate seems to be not suitable for UAO treatment. However, a dense-graded mixture has higher water stability than a half-open-graded mixture, which may be due to both aggregate gradation and asphalt. By comparative analysis of the mixture and trial section performance, asphalt and interlayer oil properties are found to have no significant influence on UAO performance. The gradation is the main factor. The performance of anti-noise, skid resistance, and the ability to restore pavement smoothness also mainly depends on the gradation. Half-open-graded is found to be the most suitable mixture for UAO, but the pull-off test results and UAO conditions in the field after a short period imply that the half-open gradation is sensitive to water. Water stability and durability should be verified during the design of the UAO mixture, especially for rainy areas.

Copyright

© 2023 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Lin Li
AU  - Qiang Li
PY  - 2023
DA  - 2023/12/30
TI  - Application of ultrathin asphalt overlay technology with 4.75-mm nominal maximum aggregate size
BT  - Proceedings of the 2023 9th International Conference on Architectural, Civil and Hydraulic Engineering (ICACHE 2023)
PB  - Atlantis Press
SP  - 138
EP  - 153
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-336-8_16
DO  - 10.2991/978-94-6463-336-8_16
ID  - Li2023
ER  -