<p><p><figure id='attachment_1463' style='max-width:829px' class='caption alignnone'><img class="wp-image-1463 size-full" style="border: 2px solid #696969;" src="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/…; alt="Photograph showing geosynthetics and aggregate being spread out over weak subsoils." width="829" height="552" /><figcaption class='caption-text'> (Photo courtesy of National Highway Institute)</figcaption></figure></p><p>Geosynthetics are used at interface between subgrade and base materials to prevent base aggregates from penetrating into soft subgrade from pumping or migrating into the base. The presence of the thin layer of separation increases the reliability and service lift of pavements. Advantages include fast and easy placement, reduction of excavation depth needed for unsuitable subgrade removal, and prevention of aggregate penetration into the subgrade. This technique is mainly applicable to stabilization of the pavement working platform.</p><p>