Method of cementing radioactive waste and cemented body
US5114622A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1989 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Dec 14, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG21F9/304
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a method of cementing a radioactive waste and a cemented body thereof which are less liable to bring about radioactivity leakage for a long period of time and suitable for disposal of cemented bodies of radioactive wastes in the land. The radioactivity leakage from a cemented body of a radioactive waste occurs due to the presence of the voids within the cemented body, and these voids are formed during hardening of the cemented body or by leaching of a soluble component from the cemented body during immersion in water. In the present invention, in order to minimize the amount of radioactivity leakage, the fraction of fine voids (1 .mu.m or less) is limited to 20% by volume or less. In order to attain such a void fraction, operating conditions, such as water to cement ratio, hardening time of a mixture of a solidifying material with a waste, and addition of an organic polymer, are properly determined. Further, in order to prevent formation of a soluble component, i.e., Ca(OH).sub.2, the CaO content of the cement is limited to not less than 0.62.times.C.sub.SiO.sbsb.2 +0.27.times.C.sub.Al.sbsb.2.sub.O.sbsb.3 and not more than 1.87.times.C.sub.SiO.sbsb.…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.