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Evaluation of the Effect Of Nanoparticles Self-Healing Properties of Binder

Shafiee, Mohammad Hossein | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42013 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Tabatabaee, Nader; aziri, Manouchehr
  7. Abstract:
  8. In flexible pavements damage initially appears in the form of microcracking due to application of traffic and leads to creation of cracks after being subjected to more loading repetitions in a few years. According to the bitumen’s significant effect on self healing process of cracks in asphalt mixtures. It is plausible to improve the binder self healing performance and pavement lifetime using self healing additives. Forming self healing polymeric materials using nanoparticles has proved to be promising. However, the ability of nanoparticles to induce self healing properties in binder has to be investigated as well. In this study the self healing characteristics of neat and nanoclay modified bitumen samples were investigated at intermediate temperatures and different testing conditions using Dynamic Shear Rheometer (DSR). These tests were conducted using Time Sweep (TS) fatigue test with different rest periods inserted at predetermined damage levels. Self healing properties for neat and modified half-cut asphalt samples were also studied using direct tension test (DTT) at low temperature. Evaluation of test results showed that the energy based concept of RDEC is capable of fatigue life prediction for neat and nanoclay modified binders. Based on the results of strain-controlled healing test results, introduction of short rest periods at specific low damage levels can increase fatigue life more than a longer rest period inserted just before the fatigue failure. It was also observed that effects of healing additive and rest time on self healing potential are dependent on aging, temperature and loading condition. This suggests that binder nanoclay modification can be considered as a promising practice to increase self healing potential.

  9. Keywords:
  10. Self Healing System ; Nanoclay Modification ; Time Sweep Test With Rest Periods ; Direct Tension Test

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