November/December 2023 - 84

EFFC/DFI Joint Task Groups Newsletter - Autumn 23
Tremie Concrete (Karsten Beckhaus)
Third Edition in preparation
Concrete placed in submerged conditions in deep
foundations (bored piles and diaphragm walls) using the
tremie method requires very specific and demanding
properties, and proper mix design is critical to the quality
of the end product.
The EFFC/DFI Tremie Concrete Task Group (CTG) has resumed its
work and is committed to improving the EFFC/DFI Guide to Tremie
Concrete for Deep Foundations which was published as a Second
Edition in 2018. Since then, existing standards and specifications
have still not been completely harmonized with the state of the art,
in particular regarding tremie concrete and performance based
specifications and testing.
The CTG has now been reinforced with additional experts
from the United States, Canada and the United Kingdom and
this combined Task Group (CTG III) is now working on the
Third Edition of the Guide. This will strengthen and amplify the
recommendations given in the Second Edition, as well as reduce
the amount of testing required wherever possible.
A new Sub-Group, working under CTG III, has been established and
this is chaired by Chris Wilkes. This group will give advice on how
          
FIGURE 6. Qualitative comparison of rheology for
different types of concrete
 
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 
 
to optimise the casting process based on numerical modelling
establishing the sensitivity of the most critical parameters.
Development of sustainable concrete is critical for the industry
to reduce its carbon footprint. Low carbon cement is being
worked on throughout the World. The Third Edition will tackle
the indisputable need to concentrate on sustainability issues,
but will balance the decarbonisation task with the need to
deliver a final product of good quality where the performance
based approach of the Guide allows options for better
sustainability when producing piles or diaphragm walls.
It is seriously hoped that the recommendations given in the Guide
(Second Edition and the new Third Edition) will be incorporated
into existing Standards like European Norm EN 206, or the Federal
Highway Administration (FHWA) publications, American Concrete
Institute ACI 302 (Concrete), and ACI 336 (Drilled Shafts) in the
United States which would contribute to developing a worldwide
mutual understanding of good practice in tremie concreting.
The next meeting of CTG III will be held at DFI48 in Seattle on
Tuesday 31st October 2023 (8-10:15 am PST). This meeting is
open to all (in person or online). If you wish to attend, please
contact: TechActivities@dfi.org.
FIGURE 11. Slump flow curve related to yield stress
and recommended range for tremie concrete

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 
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 
 
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  
04
www.effc.org/about-effc/working-groups/tremie-concrete
www.dfi.org/communities/industry-alliances/effc-dfi-collaboration/effc-dfi-concrete-task-group
 
 
 
http://www.effc.org/about-effc/working-groups/tremie-concrete http://www.dfi.org/communities/industry-alliances/effc-dfi-collaboration/effc-dfi-concrete-task-group
November/December 2023

Table of Contents for the Digital Edition of November/December 2023
