Effect of steel slag aggregates on engineering properties and residual marshall stability of open-graded asphalt concrete

Tạp chí Khoa học và Công nghệ - Đại học Đà Nẵng - Trang 57-61 - 2025
Thao T.T. Tran1, Phuong N. Pham1, Nguyen T.K. Dinh1, Huy T Ngo1, Phat Nguyen1, Hai H. Nguyen1
1The University of Danang - University of Science and Technology, Vietnam

Tóm tắt

This study investigated the influence of steel slag (SS) aggregates on the mechanical properties of open-graded hot mix asphalt (OGA), replacing crushed stone at 50%, 75%, and 100% by volume. Results showed that the optimum bitumen content (OBC) increased significantly with higher SS usage (up to 87.9% for 100SSA), likely due to SS's higher absorption. The initial Marshall stability also drastically improved, increasing by up to 172.1% for 100SSA (8.18 kN), attributed to the superior strength and interlocking of SS particles. However, the residual Marshall stability (after moisture/heat exposure) decreased as SS content increased, indicating lower moisture resistance. 75SSA provided the best balance, exhibiting 24% higher residual stability than 100SSA.The paper suggests that OGA with 75% or more SS can be used as a pavement base layer, provided it is placed at a minimum depth of 7 cm and exposed to favorable hydrothermal conditions to mitigate moisture damage.

Từ khóa


Tài liệu tham khảo

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