MOISTURE RELATED PROBLEMS IN STABILIZED MATERIALS

For higher volume roadways, stabilization of the base layers is common practice in many areas of Texas. The amount of cement or any other stabilizer used to modify a base material is generally selected based on the unconfined compressive strength of the treated layer. Recent studies have found that high initial strength does not necessarily guarantee acceptable long-term performance. The trend in recent years has been to design stabilized bases with lower strength requirements. In these instances the highway agencies often have concerns about material durability. The commonly used durability test is the abrasion type brush test which measures the resistance to twelve cycles of wetting or drying or twelve cycles of freezing and thawing. The tests are not commonly used by highway agencies because of the length of time needed to run the test and because of the variability of results. Recent research indicates that these durability problems are not related to abrasion, but to a chemical reversal of the stabilization process. Highway agencies have also reported problems with "disappearing" stabilizers after a few years in service. In most of these cases, it has been postulated that the reversal of stabilization is associated with moisture intrusion within the stabilized materials. A new test procedure called the Tube Suction Test (TST) is proposed to identify stabilized materials with potential problems. In TST the dielectric properties of the surface of the sample are measured over 10 days. This paper presents a comparison between the results of the TST and the standard durability tests. For the covering abstract see ITRD E118503.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 1151-64
  • Serial:
    • Volume: 2

Subject/Index Terms

Filing Info

  • Accession Number: 00963871
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 90-5809-398-0
  • Files: ITRD
  • Created Date: Oct 3 2003 12:00AM