Evaluation of Moisture Susceptibility of Nanoclay-Modified Asphalt Binders

Due to an increasing rate of traffic volume and truck loads in recent years, neat asphalt binders are often modified with expensive polymers for increased stiffness. Nanoclays, conversely, are relatively inexpensive and naturally abundant, and have favorable intrinsic properties (e.g., nanoscopic size and surface area). Although the stiffness of nanoclay-modified binder is reported to increase, its moisture resistance remains unknown. To this end, the current study investigated moisture resistance of a performance grade binder (PG 64-22OK) modified with different dosages of a selected nanoclay (Cloisite® 15A) through the surface free energy (SFE) technique. The state of dispersion of the nanoclay in the binder was examined using a scanning electron microscope (SEM) and small angle X-ray diffraction (SAXD) techniques. The cohesive energy of nanoclay-modified binder was found to be lower than that of the base binder. The adhesive energy between eight different aggregates (sandstone, gravel, granite, basalt, and limestone from four sources) and 2% nanoclay-modified binder in dry conditions decreased up to 22%. The adhesion energy in wet conditions reduced up to 24%. The compatibility ratio (CR) values of different aggregates with the nanoclay-modified binders show significant decrease in bond strength in cases of all aforementioned aggregates except granite.

Language

  • English

Media Info

  • Media Type: Web
  • Pagination: pp 1-8
  • Monograph Title: Application of Nanotechnology in Pavements, Geological Disasters, and Foundation Settlement Control Technology

Subject/Index Terms

Filing Info

  • Accession Number: 01534833
  • Record Type: Publication
  • ISBN: 9780784478448
  • Files: TRIS, ASCE
  • Created Date: Jul 21 2014 3:00PM