Laboratory evaluation of emulsified asphalt reinforced with glass fiber treated with different methods

Yanyan Liu, Zeyu Zhang*, Lijuan Tan, Yong Xu, Chonghui Wang, Pengfei Liu, Huayang Yu, Markus Oeser

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Emulsified asphalt (EA) is an environment-friendly paving material that is commonly used as the binder of the interlay stress-absorbing composite (ISAC) layer. Roughening the surface of glass fiber by chemical treating is an effective approach to improve the adhesion between glass fiber and EA. However, the effects of the fiber treatment method on the performance of fiber-reinforced EA (FEA) still remain unclear. In this study, glass fiber, which is commonly used in the ISAC layer, was firstly treated with six methods (three etchants in two concentrations). Fibers were then incorporated into EA to prepare FEA samples. Finally, laboratory tests, including Scanning electron microscope (SEM) test, Fourier-transform infrared spectroscopy (FTIR) test, contact angle test, surface tension test, dynamic shear rheometer (DSR) test, and direct tensile test, were performed to evaluate the changes in the physical and chemical properties of glass fiber, EA, and FEA. The experimental results indicated that etching roughened the surface of glass fiber, increased the adhesion work of EA-glass fiber and the fracture strength of FEA. In addition, it was found that the interaction between glass fiber and EA was physical bonding and the performance of FEAs depended on the glass fiber treatment method. Sulfuric acid with a concentration of 2 mol/L was recommended as the optimal glass fiber etchant.

Original languageEnglish
Article number123116
JournalJournal of Cleaner Production
Early online date30 Jul 2020
Publication statusPublished - 20 Nov 2020

Bibliographical note

Funding Information:
This research is supported by the Chongqing Graduate Innovation Project (Grant No. CYS19235 ), Research Fund of “Key Laboratory for Special Area Highway Engineering of Ministry of Education” (Grant No. 310821151104 ), and the German Research Foundation (DFG) through the project ARROWS (Grant No. OE 514/10-1 ).


  • Adhesion
  • Emulsified asphalt
  • Glass fiber
  • Rheological property
  • Surface energy
  • Surface etching


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