The EFFC/DFI Guide to Support Fluids for Deep FoundationsÂ-Video

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Video Summary

The presentation reviews the EFFC–DFI Support Fluid Guide, published in 2019, and an ongoing field research program intended to improve industry knowledge and inform a future guide edition. Support fluids are essential for stabilizing deep excavations, transporting cuttings, and enabling concrete placement. The guide explains fluid behavior, bentonite and polymer types, testing equipment, and how to select and maintain fluids according to soil and excavation methods.<br /><br />The field study addresses topics where experts identified gaps in knowledge. Across deep piles and diaphragm walls, researchers compare sampling and testing methods, monitor fluid properties, assess excavation-base cleanliness, and investigate the interface layer formed between support fluid and concrete. Early findings suggest fluid properties can remain consistent with depth, and samples reveal an interface layer containing fluid, fine materials, and concrete. About half the program is complete. The group is seeking contractors willing to provide sites for further testing.

Keywords

support fluids

EFFC-DFI guide

deep excavations

bentonite polymer

field research