Testing Procedures for Long Life Heavy Duty Stabilized Bases

Fatigue cracking is one of the major types of distresses observed in pavement structures due to repeated traffic loads. The new mechanistic pavement design protocols, such as TxME, require modulus of rupture of the materials as input to the fatigue performance models. This report discusses the practical and theoretical issues associated with traditional third point bending beam fatigue test and provides an alternative method for the determination of the tensile strength of the stabilized materials in the laboratory. To achieve the objective of the project, a full factorial laboratory experiment design consisted of four aggregates sources with distinct lithology, four stabilizer contents, and two conditioning/curing procedures were incorporated in the experiment matrix. The stabilized systems were subjected to unconfined compressive strength test, submaximal test at different strength ratios, static and dynamic indirect tension tests, free-free resonant column tests and dielectric tests, to better understand the mechanical behavior of materials in the laboratory. Moisture susceptibility tests were also incorporated in the study to monitor the degradation of the material properties with moisture intrusion in stabilized systems. A multi-dimensional aggregate feature database was developed based on 570 fabricated laboratory specimens in this research. The trend analysis of the laboratory data revealed the capability of the new laboratory procedure to provide an efficient and repeatable measure of the tensile strength of stabilized materials subjected to high number of load cycles in the laboratory.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Appendices; Figures; Maps; Photos; References; Tables;
  • Pagination: 139p

Subject/Index Terms

Filing Info

  • Accession Number: 01747133
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/TX-20/0-6812-1, 0-6812-1
  • Contract Numbers: 0-6812
  • Created Date: Jul 30 2020 3:49PM