EFFC/DFI Concrete Task Group
Formed in 2014 to address the issues that contractors experience on site with modern concrete mixes.
EFFC/DFI Guide to Tremie Concrete for Deep Foundations
The European Federation of Foundation Contractors (EFFC) and the Deep Foundations Institute (DFI) published the 1st Edition of the EFFC/DFI Guide to Tremie Concrete for Deep Foundations in 2016. A research and development project, funded by the sponsors of the Guide, and carried out by the Technical University of Munich in conjunction with the Missouri University of Science and Technology was completed in 2018. The 2nd Edition of the Guide was published in June 2018 and this includes results from the research and development program including numerical modelling studies of concrete flow. Numerical modelling gives a better understanding of the interaction between design, concrete properties, and execution methods.
The 2nd Edition of the Guide presents a review of concrete rheology, its dependence on raw materials and composition, applicable testing methods and recommended target values, as well as providing recommendations on specific design and execution details. It is intended as a practical addition to existing standards, although it is hoped that after implementation and review in practice, the principles contained in the Guide will be adopted in future revisions of Standards. Recommendations on support fluids have been removed from the 2nd Edition as these are now covered by the EFFC/DFI Support Fluid Guide which was published in 2019.
Research Report: Rheaology and Workability Testing of Deep Foundation Concrete in Europe and the US
A companion research report to the DFI/EFFC Guide to Tremie Concrete for Deep Foundations (2nd Edition) which provides information on the research incorporated in the guide that numerically models the behaviour of concrete when it is poured into an excavation. This is a new area of research which provides new insight into what is occurring during the tremie operation.