Cement-based materials, properties, evolution, barrier functions (Cebama)

Cebama was a Collaborative Project funded by the European Commission under the Horizon 2020 Reasearch and Training Programme of the European Atomic Energy Community (EURATOM) ((H2020-NFRP-2014/2015), section B - Contribute to the Development of Solutions for the Management of Ultimate Radioactive Waste, Topic NFRP 6 – 2014: Supporting the implementation of the first-of-the-kind geological repositories).

The Collaborative Project Cebama addressed key issues of relevance for long term safety and key scientific questions related to the use of cement-based materials in nuclear waste disposal applications. These materials are key components in the barrier system of repositories, independent on the actual host rocks. They are used as waste forms, liners and structural components as well as sealing materials in a broad variety of applications. Waste forms and their behaviour as well as the technical feasibility and long-term performance of repository components are key topics detailed in the Strategic Research Agenda (SRA) of the Implementing Geological Disposal Technology Platform (IGD-TP) and and cover studies related with: (a) the release of radionuclides, (b) long-term behaviour of seals and plugs, (c) evolution of cement-based seals, (d) interaction of cement with clays, and (e) optimisation aspects.

The overall objective of Cebama was to support the implementation of geological disposal by improving significantly the knowledge base for the Safety Case for European repository concepts.

The research planned in Cebama was largely independent of specific disposal concepts and addressed different types of host rocks in addition to bentonite. Cebama is not focusing on one specific cement material, but aimed to study a variety of important cement-based materials in order to provide insight on general processes and phenomena.

The ambition of Cebama was the development of a comprehensive model for predicting the transport characteristics such as porosity, permeability and diffusion parameters of cement-based materials in contact with the engineered and natural barriers of repositories in crystalline and argillaceous host rocks. Dedicated studies on radionuclide retention processes and on the impact of chemical alterations on these processes were also part of this advanced approach.

The project started on 1st June 2015 and lasted 4 years until of May 2019. The project is implemented by a consortium with 27 Beneficiaries, from 9 EURATOM Signatory States, Japan and Switzerland. National Waste Management Organizations contribute to the running project by participation in the End-User Group, by co-funding Beneficiaries, and provide for knowledge and information transfer.

The total budget was 3.9 million Euros financed by the European Commission.

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