Reference(s):
Signore and Dempsey (2002)

<p><p><strong>Current FHWA Reference(s):<br></strong><em>Holtz et al. (2008)</em><strong>Supporting Reference(s):<br></strong><em>AASHTO M288 (2006)<br>Giroud (1981)<br>Guram (1994)</em></p><p>The need for a geotextile separator is assessed based on subgrade soil strength (3≤CBR≤8). For soils that are seasonally weak, have high fines contents, or are susceptible to pumping, it is beneficial to use a geotextile to prevent migration of fines.

<p><p><strong>References:<br></strong><em>Black and Holtz (1999)<br>Guram et al. (1994)<br>Loulizi et al. (1999)</em></p><p><strong>Method Summary </strong></p><p>Exploratory excavations (test pits) are made at each test section to observe the conditions of the pavement layers, ground water, and geosynthetics.

<p><p><strong>References:<br></strong><em>Al-Qadi and Appea (2003)<br>Black and Holtz (1999)<br>Hayden et al. (1998)<br>Loulizi et al. (1999)</em></p><p><strong>Method Summary </strong></p><p>A nondestructive FWD test is conducted on the pavement to estimate its structural capacity and thus its service life. The FWD equipment can apply an impulse load of 40 kN for 40 ms to simulate the traffic load on the pavement.