DEVELOPMENT OF AN ACCELERATED CREEP TESTING PROCEDURE FOR GEOSYNTHETICS, PART II: ANALYSIS

This is the second part of a two-part paper, published in this journal (Vol. 20, No. 4, December 1997). When creep strain is plotted versus time for different temperatures, the experimental logarithmic curves of strains along the time axis can be shifted until the curves overlap and a single curve is obtained. This curve, the master curve, represents strain for longer time intervals at the reference temperatures. This paper presents a methodology for estimating the shift factors and establishing the master curves for geosynthetics from temperature creep test results. The procedure was applied to creep test results on high density polyethylene (HDPE) geogrid tested at creep loads up to 40% of its maximum tensile strength T sub max and at temperatures up to 72 degrees C (160 degrees F). Temperature creep curves of 1000 h tests were shifted along the log-time scale to create 10,000 h master strain curves at each loading level. The established master curves were compared with experimental results of 10,000 h creep tests at room temperature and at the same loading levels. The shift factors were then applied to the creep curves to predict creep response for a duration of more than 100,000 h (about the shift of two cycles on the log-time scale from the initial 1,000 h tests). The analysis demonstrated the applicability of applying shift factors to elevated temperature creep test results to predict the response at longer times for this type of geogrid. The analysis was applicable to creep loads up to 40% T sub max. The procedure, however, did not accurately estimate creep response at higher loading levels and temperatures where accelerated creep failure occurred.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01496115
• Corporate Authors:

  American Society for Testing and Materials (ASTM)

  100 Barr Harbor Drive, P.O. Box C700
  West Conshohocken, PA  United States  19428-2957
• Authors:
  • Farrag, K
• Publication Date: 1998-3

Language

• English

Media Info

• Features: Figures; References;
• Pagination: p. 38-44
• Serial:
  • Geotechnical Testing Journal
  • Volume: 21
  • Issue Number: 1
  • Publisher: ASTM International
  • ISSN: 0149-6115
  • EISSN: 1945-7545
  • Serial URL: https://www.astm.org/products-services/standards-and-publications/geotechnical-testing-journal.html

Subject/Index Terms

• TRT Terms: Accelerated tests; Analysis; Creep tests; Geosynthetics; Geotextiles; High temperature; Laboratory tests; Logarithms; Mathematical prediction; Temperature
• Uncontrolled Terms: High density polyethylene; Temperature shift
• Subject Areas: Data and Information Technology; Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00809316
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 11 2001 12:00AM