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

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
77 Downloads (Pure)

Abstract

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.
Original languageEnglish
Article number16
Pages (from-to)1-20
Number of pages20
JournalBuildings
Volume13
Issue number1
DOIs
Publication statusPublished - 2022

Keywords

  • pretreated steel slag aggregate
  • asphalt mixture
  • performance characterization
  • adhesion
  • surface energy

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