TY - JOUR
T1 - Surface Modification of Steel Slag Aggregate for Engineering Application in Asphalt Mixture
AU - Niu, Dongyu
AU - Zhang, Zhao
AU - Meng, Jiandang
AU - Yang, Zhengxian
AU - Jing, Ruxin
AU - Liu, Xueyan
AU - Lin, Peng
AU - Sheng , Yanping
PY - 2022
Y1 - 2022
N2 - 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.
AB - 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.
KW - pretreated steel slag aggregate
KW - asphalt mixture
KW - performance characterization
KW - adhesion
KW - surface energy
UR - http://www.scopus.com/inward/record.url?scp=85146706605&partnerID=8YFLogxK
U2 - 10.3390/buildings13010016
DO - 10.3390/buildings13010016
M3 - Article
SN - 2075-5309
VL - 13
SP - 1
EP - 20
JO - Buildings
JF - Buildings
IS - 1
M1 - 16
ER -