<p><p><strong>Reference(s):</strong></p><p><em>Hicks et al. (1995)</em></p><p><strong>Method Summary</strong></p><p>The Marshall Stability Test (ASTM D1559), developed by the Corps of Engineers, is used to measure the strength of an asphalt mixture sample previously compacted to a standard laboratory compactive effort. The stability is the maximum load that must be applied to cause the sample to fail.</p><p>Resilient modulus is the most common method of measuring stiffness modulus for asphalt concrete samples that are field cored or laboratory prepared. It is a repeated load indirect tension test method covered in ASTM D4123.</p><p><strong>Accuracy and Precision</strong></p><p>Tests are standardized and give reasonably accurate results.</p><p><strong>Adequacy of Coverage</strong></p><p>Adequate coverage requires enough tests so that results can be considered representative.</p><p><strong>Implementation Requirements </strong></p><p>Implementation requirements for the QC/QA methods are not excessive.</p><p><strong>General Comments</strong></p><p>Good volumetric quality control procedures should be followed. Some modifications will need to be made for the rubber, the asphalt-rubber binder, and the CRM-HMA mix. In all three states surveyed, the purchasing agencies (cities, counties, or DOTs) require that the CRM supplier furnish the engineer-certified test results covering each shipment of material to each project. They also require that the certification include the manufacturer's batch or lot number. Some agencies do verification testing on the rubber gradation.</p></p>