Physical and transport properties of bentonite-cement composites: A new material for in situ capping of contaminated underwater sediments


Journal Article

Formulations of bentonite-cement composites are explored as a basis for creating a range of structured, semipermeable layers adapted to in situ capping of contaminated underwater sediments. In addition to being mechanically stable, such composites allow for control of cap microstructure and transport properties through the fine-tuning of postdepositional hydration processes in the cap. Microscopic studies combined with flowability and setting tests were used to establish relationships between the structural and mechanical properties of the composites. Apparent diffusion coefficients for transport through the caps were measured and corresponding porosity values were calculated for the composites formed under different hydration conditions. Analysis of calculated porosity values combined with microscopy data indicates that the particle packing density plays a crucial role in the development of cap's microstructural features and retardation capacity. © Mary Ann Liebert, Inc.

Full Text

Duke Authors

Cited Authors

  • Tarabara, VV; Wiesner, MR

Published Date

  • September 1, 2005

Published In

Volume / Issue

  • 22 / 5

Start / End Page

  • 578 - 590

International Standard Serial Number (ISSN)

  • 1092-8758

Digital Object Identifier (DOI)

  • 10.1089/ees.2005.22.578

Citation Source

  • Scopus