Development of Models to Estimate Modulus and Permanent Deformation of Texas Bases

Eric Navarro, University of Texas at El Paso


The performance of flexible pavements depends on many factors such as structural adequacy, properties of materials used, traffic loading, climatic conditions and construction practices. Some of the distresses experienced in flexible pavements can be traced to the problems encountered in base materials (Hall et al., 2001). Resilient modulus and permanent deformation test results of compacted unbound pavement layers are key inputs to the new generations of mechanistic-empirical design programs such as MEPDG and TexME. For a Level 1 (most rigorous) design, the resilient modulus and permanent deformation parameters of unbound granular materials and subgrade layers are determined through laboratory cyclic triaxial tests. These tests in general measure the stiffness of cylindrical specimens that are exposed to a number of repeated axial stresses and confining pressures. Various constitutive models exist in the literature to relate modulus parameters to the state of stress (Puppala, 2008). Several factors such as moisture content, gradation and density impact the modulus and permanent deformation values.

Subject Area

Civil engineering

Recommended Citation

Navarro, Eric, "Development of Models to Estimate Modulus and Permanent Deformation of Texas Bases" (2012). ETD Collection for University of Texas, El Paso. AAI1533244.