Sublayer Strength Evaluation with FWD in Semi-Rigid Base Asphalt Pavement Rehabilitation Project Conference Paper uri icon


  • This paper used dynamic FEM model instead of continuum elastic layered system to simulate whole or broken semi-rigid base asphalt pavement response under FWD. Calculating results indicated that the sublayer strength can be evaluated by special FWD deflection basin parameter. Subgrade modulus (Esg) can be well evaluated by Curvature Index CI7 and Shape Factor F 8 and the estimated results were not affected by pavement structure cracking condition. Whether Esg greater than 170MPa or not is defined as pavement subgrade failure criteria. Curvature Index CI3 can use to indicate the semi-rigid base layer structural condition and its criteria is CI3 value greater than 60um. This method have been applied and validated successfully in Jialiu Expressway rehabilitation project in Shanghai. It can more precisely distinguish weak sections for pavement rehabilitation design. 2010 ASCE.

name of conference

  • Paving Materials and Pavement Analysis

published proceedings

  • Paving Materials and Pavement Analysis

author list (cited authors)

  • Cong, L., Lytton, R. L., & Xie, Z.

citation count

  • 1

complete list of authors

  • Cong, Lin||Lytton, Robert L||Xie, Zhaoxing

publication date

  • May 2010