This paper presents the results of a field investigation and laboratory testing program to evaluate the properties of two different polyproplene, thermally-bonded nonwoven geotextiles exhumed from seven existing unpaved road structures. The results of the field investigation and test program are used to assess the construction survivability and long-term durability characteristics of the two materials. Measured geotextile strengths after one to twelve years of burial range from 50 to 90% of their initial values. The mount of strength loss in the exhymed samples was found to vary with the severity of the construction conditions. Scanning electron photomicrographs indicate that the primary cause of the observed strength losses is mechanical damage to the geotextile structure. No evidence of long-term polymer degradation was observed in the photomicrographs. Results of differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR) analyses show evidence of the polymer oxidation and changes in structural morphology. While the amount of polymer degradation cannot be quantified, the evidence suggests that it is very minor. The conclusion is reached that almost all of the strength loss experienced by the geotextiles is due to mechanical damage that occurred during construction. Under the conditions investigated, up to twelve years of in-soil burial apparently resulted in only very minor amounts of polymer degradation.


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 68-91

Subject/Index Terms

Filing Info

  • Accession Number: 00766654
  • Record Type: Publication
  • ISBN: 0872626482
  • Report/Paper Numbers: Geotechnical Special, Publication 18
  • Files: TRIS
  • Created Date: Jul 1 1999 12:00AM