Phase field simulation and microscopic observation of phase separation and thermal stability of polymer modified asphalt

Ming Liang, Xue Xin, Weiyu Fan, Hao Wang, Wei Sun

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Phase separation and thermal stability of polymer modified asphalt are the most challenging issues that significantly affect the performance of asphalt in engineering applications. This paper employed phase field method to study phase separation behavior of styrene-butadiene-styrene (SBS) modified asphalt, aiming to reveal the key parameter controlling the phase separation process and evaluate the influences of various styrene-butadiene structures on phase behavior. Combined with the observation from fluorescence microscopy (FM), phase field model related to polymer structure was established for each SBS modified asphalt. The model parameters shed lights on interaction and swelling among SBS and asphalt. Furthermore, the coupled Navier-Stokes equations phase field model (NSPFM) was developed to simulate thermal stability of SBS modified asphalt. The simulated stability was compared with stability observed from experimental test. The results indicated that the block ratio of SBS significantly affects the phase behavior of modified asphalt, which explains the changes of morphology. The diffusion and swelling of SBS molecule as well as the interaction among polystyrene blocks, polybutadiene blocks, and asphalt component mainly control the phase separation process. By comparison with microscopy images, it was proved that NSPFM is an effective approach to track the phase separation process during storage. The simulated stability results were consistent with experimental results of tube tests.

Original languageEnglish (US)
Pages (from-to)132-143
Number of pages12
JournalConstruction and Building Materials
Volume204
DOIs
StatePublished - Apr 20 2019

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

Keywords

  • Microscopy
  • Phase field simulation
  • Phase separation
  • Polymer modified asphalt
  • Thermal stability

Fingerprint

Dive into the research topics of 'Phase field simulation and microscopic observation of phase separation and thermal stability of polymer modified asphalt'. Together they form a unique fingerprint.

Cite this