<p><p><strong>Reference(s):</strong></p><p><em>Al-Qadi and Hughes (2000)<br>Emersleben and Meyer (2008)</em></p><p><strong>Method Summary</strong></p><p>FWD was used to perform a structural evaluation of the reconstructed geocell-reinforced road. Three FWD measurements were made over a period of two years. In this evaluation, the FWD device dropped a calibrated mass of approximately 40 kN onto a 300-mm diameter plate in contact with the pavement surface. The device recorded the magnitude of the applied load and the vertical deflection response of the pavement surface at seven locations – the center of the loaded plate and six other locations offset from the loaded axis (-300, 0, 300, 600, 900, 1,200, and 1,500 mm). The benefits of geocell have not been well confirmed.</p><p>Emersleben and Meyer (2008) conducted FWD measurements on both the geocell-reinforced and unreinforced sections to evaluate the influence of the geocell layer within the mineral base course. The geocell reinforced section showed 15% lower deflections and 10% higher layer modulus than those of unreinforced sections.</p><p><strong>Accuracy and Precision</strong></p><p>The verification method by Al-Qadi and Hughes (2000) has been successfully used to evaluate pavements without geocell. The accuracy and precision of the method for evaluating geocell-reinforced roadways have not been confirmed by Al-qadi and Hughes (2000) whereas those have been confirmed by Emersleben and Meyer (2008).</p><p><strong>Adequacy of Coverage</strong></p><p>FWD can be performed in a reasonable time; however, a limited number of tests are often done in field.</p><p><strong>Implementation Requirements </strong></p><p>Implementation requirements (cost, personnel, training, equipment, and time) are moderate.</p><p><strong>General Comments</strong></p><p>This QC/QA method is not applicable to a method approach specification and highly applicable to a quality assurance and performance based specification. The method can be used for several applications such as pavement foundation stabilization, construction working platforms, compaction, settlement reduction, thickness reduction of pavement section, and prolonging pavement service life.</p></p>