Research on the Shear Strength of Porous Asphalt Overlay

DOI

10.2991/978-94-6463-793-9_35How to use a DOI?

Keywords

Porous asphalt; Shear strength; Shear test; Waterproof and cohesive layer

Abstract

To investigate the factors influencing the bonding strength between the PAC-13 overlay and the underlying layer, this study focused on a porous asphalt concrete (PAC) overlay project on the Yan-Jing Expressway. Six types of core samples were subjected to conduct shear strength test at three temperatures (25℃, 45℃, and 70℃). The study examined three factors: temperature, material type, and surface texture depth. Results showed that at an intermediate temperature (25℃), the shear strength of SBS modified emulsified asphalt was 75% of that of rubber asphalt, and the texture depth of the underlying layer significantly impacted shear strength, with the milled surface exhibiting a shear strength 0.73 MPa higher than that of the road marking surface. As temperature increased from 25℃ to 45℃, shear strength decreased by over 40%, with the range of shear strength decreasing from 0.73 MPa at 25℃ to 0.11 MPa at 45℃. To evaluate the interlayer contact area, MATLAB software was used to enhance and sharpen post-test images of the samples. The Otsu method was applied to convert these images into binary images, allowing for the calculation of the contact area between the PAC-13 overlay and the underlying layer. Results indicated that as temperature rose, the contact area of core samples decreased from 79% at 25℃ to 66% at 45℃, and to 62% at 70℃. Based on these findings, the thermal stability of the waterproof and cohesive layer must be enhanced to prevent shear failure at high temperatures.

Copyright

© 2025 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  - Xiaotian Jiang
AU  - Binlei Wang
PY  - 2025
DA  - 2025/07/28
TI  - Research on the Shear Strength of Porous Asphalt Overlay
BT  - Proceedings of the 2025 8th International Conference on Traffic Transportation and Civil Architecture (ICTTCA 2025)
PB  - Atlantis Press
SP  - 409
EP  - 417
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-793-9_35
DO  - 10.2991/978-94-6463-793-9_35
ID  - Jiang2025
ER  -