<p><p><strong>Reference(s):</strong></p><p><em>Zhang and Tao (2006)</em></p><p><strong>Method Summary</strong></p><p>The Dynamic Cone Penetrometer (DCP) is a simple and effective tool for evaluating in-situ strength of pavement layers and subgrade. The device consists of an upper fixed 22.7-inch (575 mm) travel rod with a 17.6-pound (8 kg) falling weight hammer, a lower rod containing an anvil, and a replaceable 60° cone of ¾-inch (20 mm) diameter. It provides continuous measurements of in-situ strength of subgrade soils without sampling. The test involves lifting and dropping the 17.6 pound (8 kg) hammer to strike the anvil, driving the ¾-inch (20mm) diameter cone from the surface down to the required depth.</p><p>The Falling Weight Deflectometer Tests (FWD) is a trailer-mounted device that delivers an impulse load to the surface under investigation. The equipment automatically lifts a weight to a given height. The weight is dropped onto a 12-inch (300 mm) circular load plate with a thin rubber pad mounted underneath. A load cell measures the force or load applied to the pavement under the plate. Seven sensors measure the deflections caused by the impulse load.</p><p><strong>Accuracy and Precision</strong></p><p>Standard tests were used.</p><p><strong>Adequacy of Coverage</strong></p><p>Standard tests were used.</p><p><strong>Implementation Requirements </strong></p><p>Easy to implement.</p><p><strong>General Comments</strong></p><p>This study was divided into two major parts: laboratory and field tests. Laboratory tests were conducted to identify factors that significantly affect the strength development of raw BCS and to seek a suitable stabilization scheme for ameliorating water susceptibility of raw BCS. The effectiveness of each stabilization scheme was evaluated from the perspective of water resistance, strength, and volumetric expansion incurred by stabilization.</p><p>The field test program covered the building of a full-scale test section at the PRF site according to proposed construction specifications and evaluated the performance of stabilized BCS base courses through in-situ tests (DCP, FWD).</p></p>