Surface Modification of Steel Slag Aggregate for Engineering Application in Asphalt Mixture
Dongyu Niu,
Zhao Zhang,
Jiandang Meng,
Zhengxian Yang,
Ruxin Jing,
Xueyan Liu,
Peng Lin,
Yanping Sheng
Affiliations
Dongyu Niu
Engineering Research Center of Transportation Materials of the Ministry of Education, Chang’an University, Xi’an 710061, China
Zhao Zhang
Engineering Research Center of Transportation Materials of the Ministry of Education, Chang’an University, Xi’an 710061, China
Jiandang Meng
Puyang Branch Office of Henan Transport Development Group Co., Ltd., Puyang 450000, China
Zhengxian Yang
College of Civil Engineering, Fujian Provincial University Research Center for Advanced Civil Engineering Materials, Fuzhou University, Fuzhou 350108, China
Ruxin Jing
Section of Pavement Engineering, Department of Engineering Structures, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
Xueyan Liu
Section of Pavement Engineering, Department of Engineering Structures, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
Peng Lin
Section of Pavement Engineering, Department of Engineering Structures, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
Yanping Sheng
Engineering Research Center of Transportation Materials of the Ministry of Education, Chang’an University, Xi’an 710061, China
The proper disposal of steel slag has always been a great challenge for the metallurgical industry in China and around the world. In this work, the steel slag aggregate (SSA) was surface pretreated (PSSA) and applied into asphalt mixture. The adhesive behavior between the bitumen and five different types of aggregates (i.e., limestone, diorite, diabase, SSA, PSSA) were evaluated based on the contact angle and binder bond strength tests. The pavement performance of three asphalt mixtures which contain normal aggregate, SSA and PSSA respectively, was analyzed by Marshall stability test, wheel-tracking rutting test, low-temperature bending creep test and water sensitivity test. The results showed that surface modification can improve the surface properties of SSA, reduce its contact angle with bitumen, and eventually lead to the improvement of adhesion between them. In addition to the satisfied low-temperature properties, PSSA was found to significantly improve the anti-rutting property and reduce the water sensitivity of asphalt mixture. This work is expected to promote an alternative application for recycling of SSA in pavement engineering.
