Pavement Design Services

ETTL provides pavement design services for a variety of clients in road, highway, parking lot and similar projects.

For TxDOT pavement designs soil samples undergo Texas Triaxial testing to determine its subgrade stiffness modulus—one of the strength parameters used in pavement design. These and other data are turned over to ETTL's engineering department for development of the pavement design, following TxDOT formulas that take into consideration such factors as traffic counts and proximity to nearby metropolitan areas. The design will recommend thicknesses and materials for the various layers of the pavement, with options relating to economy, strength and other factors.

With various other clients, ETTL may use slightly different testing techniques. For example, formulas used by AASHTO (the American Association of State Highway & Transportation Officials) may be employed, and instead of Texas Triaxial testing, California Bearing Ratio (CBR) tests may be used.


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