<p><p><strong>References:<br></strong><em>Berg et al. (2009)<br>Christopher et al. (1990a)<br>Elias et al. (2001a)</em></p><p><strong>Method Summary: </strong></p><p>Degradation and corrosion is one of the few disadvantages listed for RSS structure, which including corrosion of exposed facing element, reinforcing elements in the presence of aggressive chemicals, and backfill materials. The suitable design criteria and selection of reinforcing elements, degradation protection, performance monitoring can effectively address this issue.</p><p><strong>Accuracy and Precision </strong></p><p>Current AASHTO specification established the evaluation of degradation/corrosion with confidence and model reliability, with involved historical data. These data will be used to evaluate parameters and other adjustments needed to estimate the impacts of marginal quality fills on service life. More detailed information can be refereed to Corrosion/Degradation documents (Elias, 2009).</p><p><strong>Adequacy of Coverage </strong></p><p>Monitoring is required where degradation/corrosion occurs. The soil type, soil environments, durability of different types of geosynthetic reinforcements under certain specified conditions, selection and evaluation of monitoring methods are important to know for reducing degradation/correction risk, which also explained in Elias (2009)</p><p><strong>Implementation Requirements </strong></p><p>The corrosion losses in RSS structure should be carefully monitored and addressed by implementation of non-destructive filed evaluation systems using remote electrochemical test, and/or retrieval protocols and destructive test depend on employed reinforcement types.</p><p><strong>General Comments</strong></p><p>In general, the mechanical damage, stress (creep), and exposure to chemical or biological interactions with surrounding environments would cause degradation and deterioration. Therefore, the design details, degradation and corrosion resistance of construction materials should be individually and thoroughly evaluated based on in-situ conditions.</p></p>