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This article explores the key technical barriers associated with top cover materials used in engineering. It highlights the essential characteristics that make these materials effective, including low permeability to limit infiltration and enhance surface drainage, durability to withstand erosion, desiccation, and freeze/thaw cycles, as well as the flexibility needed to handle large differential settlements without cracking. Additionally, mechanical stability is discussed as a crucial factor for the longevity and performance of top cover systems.
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