Community Research and Development Information Service - CORDIS

Abstract

Cementitious materials are used as immobilizing matrices for low (LLW) and medium-level wastes (MLW) and are also components of the construction materials in the secondary barriers and the repositories. This report has concerned itself with a critical assessment of the quality assurance aspects of the immobilization and disposal of MLW and LLW cemented wastes. This report has collated the existing knowledge of the use and potential of cementitious materials in radioactive waste immobilization and highlighted the physico-chemical parameters which need to be investigated. Subject areas reviewed include an assessment of immobilization objectives and cement as a durable material, waste stream and matrix characterization, quality assurance concepts, nature of cement-based systems, chemistry and modelling of cement hydration, role and effect of blending agents, radwaste- cement interaction, assessment of durability, degradative and radiolytic processes in cements and the behaviour of cement-based matrices and their near-field interactions with the environment and the repository conditions. Areas which may need further research include: the existing variability and the need for characterization of the waste stream, investigation of the interactions between (a) wasteform and cements, (b) wastes and blending agents, (c) cements and blending agents, and (d) components of the wasteforms and matrix materials with components of the repository environment and durability of the cements in the repository. The experience of cementitious systems in the construction industry offers some parallels to establish the limits of acceptance, but the special needs for long-term durability and immobilizing capacity for radionuclides by the matrices make the direct transfer of the former experience insufficient

Additional information

Authors: RAHMAN A A, UNIVERSITY OF ABERDEEN (UK);GLASSER F P UNIVERSITY OF ABERDEEN (UK), UNIVERSITY OF ABERDEEN (UK)
Bibliographic Reference: EUR 10803 EN (1987) FS, 193 P., BFR 600, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989126011400 / Last updated on: 1989-03-01
Category: PUBLICATION
Available languages: en