Characterization of Bases and Subbases for AASHTO ME Pavement Design

The characteristics of base and subbase layers play a very important role in pavement performance under the complex conditions of traffic loading and environment. Unreasonable and inaccurate base design parameters can result in poor pavement performance as well as higher construction and maintenance costs. This study was conducted to develop material input databases for several common types of base and subbase layers in South Carolina including Graded Aggregate Base (GAB), Cement Stabilized Aggregate Base (CSAB), Cement Modified Recycled Base (CMRB), and Soil-Cement (S-C). Seven South Carolina aggregate sources were used to evaluate GAB. Five of these sources were used to evaluate CSAB. Two subgrade sources (clay soil and sandy soil) and one RAP source were utilized to evaluate CMRB. The same two subgrade sources were also used to evaluate S-C. One GAB source was also utilized in a laboratory test pit to simulate field conditions and correlate with other testing. Compressive strength, elastic modulus, dry shrinkage, resilient modulus, and other properties were characterized through laboratory testing. Optimum mathematical resilient modulus models and material coefficients were recommended for the different kinds of base layers. A database was compiled, which considers the effect of moisture content, cement content, material type, curing period, and so on.

  • Record URL:
  • Corporate Authors:

    Tri-County Technical College

    7900 Highway 76
    Pendleton, SC  United States  29670

    South Carolina Department of Transportation

    Office of Materials and Research
    1406 Shop Road
    Columbia, SC  United States  29201

    Federal Highway Administration

    South Carolina Division
    1835 Assembly Street
    Columbia, SC  United States  29201
  • Authors:
    • Amirkhanian, Serji
    • Corley, Mary
  • Publication Date: 2021-1


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Maps; Photos; References; Tables;
  • Pagination: 149p

Subject/Index Terms

Filing Info

  • Accession Number: 01762776
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-SC-21-01, TCTC 21-01
  • Contract Numbers: SPR No. 736
  • Created Date: Jan 8 2021 1:23PM