Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Patent
1995-10-11
1998-01-13
Marcheschi, Michael
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
106694, 106695, 106696, 106697, 106718, 106719, 106724, 106726, 106773, 106774, 106778, 106780, 106802, 106805, 106810, 106811, 106728, 106816, 106819, 106823, 524 2, 524650, 405266, 588252, 588257, C04B 1804, C04B 1426, C04B 2404, C04B 2410
Patent
active
057074437
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of International Application No. PCT/GB94/01861 filed Aug. 25, 1994.
GROUTING MATERIALS AND THEIR USE
The present invention relates to grouting materials and methods for their use.
Grouting or cementing materials are commonly employed to form solid rigid masses by addition of powders of the material to water. Such materials may be employed not only for the production of concrete for widely used building structures but also in specialised applications such as the encapsulation in containers of hazardous substances such as radioactive wastes.
It is usual for the grouting material to be mixed as soon as it is added to water. Such mixing can be time consuming and costly and in specialised applications requires significant quality control and care. For example, where mixing for encapsulation of radioactive waste liquors and slurries is carried out it has in some cases been necessary to mix the cementing material with the waste liquor or slurry. Decontamination of the mixing equipment is required in such cases and this is hazardous as well as time consuming and costly.
The present invention provides a novel grouting material, and a method of using the same, which allows addition of the material to a water-containing liquor or slurry to form a solid mass therein, eg to encapsulate the same, without the need for the conventional mixing step.
According to the present invention in a first aspect there is provided a grouting material which is self-dispersing when brought into contact with a volume of water containing liquor or slurry and is settable to a solid mass after such dispersion, the material comprising a composition, Composition X, which comprises a blend of:
Component A: a cementive constituent forming from 10 percent to 95 percent by weight of the composition;
Component B: a disintegrating mechanism promoting constituent forming from 2 percent to 75 percent by weight of the composition;
Component C: an optional swelling constituent which forms from 0 percent to 50 percent by weight of the composition;
Component D: a binder constituent which forms from 0.1 percent to 10 percent by weight of the composition.
The percentages of components A, B, C and D add to 100 percent.
Desirably, Components A, B and C each comprise powders which preferably have mean particle diameters less than 25 micrometers, especially less than 10 micrometers.
The material comprising Composition X may incorporate, as well as composition X, other optional additives such as hardeners, inert fillers, strength-inducing fibres or whiskers and bio-active materials. Desirably, the material is in the form of granules or pellets having a mean diameter or length greater than 0.5 mm, eg in the range 1 mm to 25 mm. Such pellets may be in the form of spheres, spheroids, cubes, cuboids, cylinders or other suitable shapes. The purpose of using the material in pellet form is to provide large voids between pellets to increase volume loadings in use when added to watercontaining liquor or slurry.
According to the present invention in a second aspect there is provided a method of forming a mass of solid in a volume of water-containing liquor or slurry which comprises the steps of adding pellets of the aforementioned material of Composition X to the liquor or slurry in such quantity that the material may disperse throughout the volume or a substantial layer thereof, allowing the material to become dispersed in the said volume and allowing the material to set to form a mass of solid.
The liquor or slurry may contain hazardous substances, eg radioactive waste material, and may be contained in a suitable container, eg a stainless steel drum. The solid mass formed by the said method may comprise an encapsulating layer or body which suitably seals the contents of the container.
The present invention unexpectedly and beneficially provides a material and a method of using the material which may be used to encapsulate liquors and slurries, especially containing hazardous substances, in containers without the need for expensive and cost
REFERENCES:
patent: 3579366 (1971-05-01), Rehmar
patent: 5133806 (1992-07-01), Sakamoto et al.
Brown David John
Higson Stephen Geoffrey
British Nuclear Fuels
Marcheschi Michael
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