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Abstract

A detailed study has been made of the modification of ordinary Portland cement with polymeric additives, and of the properties of waste forms based on these matrix materials. The additives were styrene butadiene and bitumen emulsions, and epoxide and polyurethane resins: the simulated wastes were organic ion exchanger beads, PWR evaporator concentrate, reprocessing concentrate and Magnox metal. The effect of polymer:cement (p:c) and water:cement ratios on the properties of the hardened cement paste has been comprehensively investigated. Substantial increases in strain to failure, and modest reductions in permeability to water and leach rates for Cs**137, are obtained at p:c>0.2. Much larger volume fractions of organic ion exchange beads can be encapsulated in polymer modified OPC than in unmodified OPC, perhaps because of their better strain capability. The radiation stability of cemented PWR evaporator concentrate is better for a polymer modified matrix than an unmodified OPC matrix. Two hundred litre trials have been successfully demonstrated.

Additional information

Authors: JOHNSON D I, AERE, ATOMIC ENERGY RESEARCH ESTABLISHMENT, HARWELL (UK);WORRALL G, AERE, ATOMIC ENERGY RESEARCH ESTABLISHMENT, HARWELL (UK);PHILLIPS D C AERE, ATOMIC ENERGY RESEARCH ESTABLISHMENT, HARWELL (UK), AERE, ATOMIC ENERGY RESEARCH ESTABLISHMENT, HARWELL (UK)
Bibliographic Reference: EUR 10703 EN (1986) FS, 66 P., BFR 250, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989124137500 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en