The Tremie Guide – about Concrete Performance and Sustainability-PPT Presentation

PPT Presentation

Pdf Summary

The presentation reviews the development of guidance for tremie concrete used in deep foundations. Before 2014, defects such as inclusions, mattressing and bleed channels were common. These imperfections can result from the interaction of support-fluid behaviour, reinforcement layout, concrete performance and construction procedures—not simply from poor concrete—so prevention depends on coordinated teamwork.

The third edition of <em>The Tremie Guide</em> expands guidance on concrete testing, sustainability and numerical modelling. It treats tremie concrete as a distinct material, not as self-compacting concrete (SCC). Tremie concrete typically needs properties suited to long pours: sufficient yield stress and stability to limit segregation, bleeding and filtration, while maintaining flowability and workability over time. Early stiffening can cause defects, making workability retention important.

The guide sets out pre-construction suitability testing and on-site identity testing, covering measures such as slump flow, flow velocity, bleeding, filtration and segregation. It also addresses quality control of completed works, including non-destructive methods such as low-strain integrity testing, cross-hole sonic logging and thermal integrity profiling. Such testing can identify possible anomalies but cannot prevent imperfections.

Numerical modelling can help explain concrete-flow behaviour and assess factors such as tremie embedment. The presentation emphasizes performance-based, sustainable concrete throughout the in-situ casting process and guidance for all parties involved in procurement, design and construction. A fourth edition is under preparation, with the aim of contributing to standards and aligning with future EN 206-3.

Keywords

tremie concrete

deep foundations

defects

guidance

workability retention

segregation

bleeding

quality control

numerical modelling

EN 206-3