A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Application of ultrathin asphalt overlay technology with 4.75-mm nominal maximum aggregate size
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.
Application of ultrathin asphalt overlay technology with 4.75-mm nominal maximum aggregate size
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.
Application of ultrathin asphalt overlay technology with 4.75-mm nominal maximum aggregate size
Advances in Engineering res
Li, Dayong (editor) / Zhang, Yu (editor) / Luan, Yalin (editor) / Li, Lin (author) / Li, Qiang (author)
International Conference on Architectural, Civil and Hydraulic Engineering ; 2023 ; Qingdao, China
2023-12-28
16 pages
Article/Chapter (Book)
Electronic Resource
English
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