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90 Precautions are addressed in the specifications and guide- 2. Other data and information from field performance of met- lines developed under this project for backfill applications. als in CLSM should be gathered and synthesized to better quantify the service life in various environments. 3. Other durability issues, such as frost heave (or other frost- Suggested Research related issues), should be studied in more detail to deter- As is the case for any research project, all of the important mine if long-term field performance can be assured in cold issues can not be studied, or at least not in the level of detail de- climates, with severe freeze-thaw cycles. sired. This research made important gains in many of the tech- 4. Information should be gathered on problems encoun- nical areas relevant to CLSM, and the findings from this study tered in field applications related to excessive long-term have shed light on issues that require even more study. The strength gain that have hindered excavation. Information following list presents some of the areas for suggested future on materials, mixture proportions, and engineering prop- research: erties (e.g., strength, unit weight, etc.) should be gathered in order to further elucidate the factors that most con- 1. More long-term monitoring is essential in truly assessing the tribute to excavatability problems. corrosion of metals in CLSM. Field tests initiated under this 5. More detailed information on productivity and speed of project will continue to be monitored, and the relevant find- CLSM, compared to conventional compacted fill, should ings will be communicated to the appropriate AASHTO be collected to better quantify the benefits of using CLSM committees. in the four key applications studied in this project.