1. CEMENTATION. Lahoussoy thomas

2. CEMENTATION It is a technique widely used for medium-level waste to long life. It is simple to implement, inexpensive and low binding as to the physical and chemical waste to integrate.

3. CEMENTATION The cement has real capacity to chemical fixation of radioisotopes. In this sense, it differs from a simple matrix coating. When making cement, new compounds from chemical reactions between primary minerals made by the cement and waste constituents can form and effectively trapping radionuclides Ce liant hydraulique est largement utilisé dans l’industrie nucléaire. Il sert à immobiliser des déchets solides au sein de conteneurs ou comme matrice de conditionnement pour enrober des déchets de moyenne activité.

4. CEMENTATION ADVANTAGES low cost easy installation DRAWBACK The interactions between components of certain wastes and the cement matrix may lead to swelling and cracking of the package, reducing its durability.

5. NEW PROCESS Studies have been conducted to optimize the cement while retaining its advantages in terms of cost and implementation. Compostel Sulfo-aluminous cements

6. COMPOSTEL Method relies on the incorporation of radionuclides and soluble salts in a mineral structure and a hydraulic binder. His scientific feasibility has been demonstrated in laboratory scale. However, the industrial implementation of this process is complex, which degrades the advantage of strong smooth implementation of the cementation.

7. COMPOSTEL Stabilization of the waste Amalgamation of the radionuclides contained in the sludge soluble salts in a mineral structure of the family of sodium and zirconium phosphate (NZP) which is the function of containment Immobilization of particles obtained in a cement matrix.

8. COMPOSTEL Finally, the volume of waste conditioning is less than the initial volume of 10% to 50%, chemical durability properties acquired NZP phases are promising. The industrial implementation of this process requires the design and develop a completely new facility, at least for the hydrothermal synthesis step, which can be complex.

9. SULFO-ALUMINOUS CEMENTS Only the formulation of concrete changes, the facilities do not have to be modified.

10. SULFO-ALUMINOUS CEMENTS Coatings by a common cement, calcium silicate type, is source of difficulty. borates inhibit the binding decision. sulfates can cause swelling and delayed cracking of the hardened material. It is often necessary to pretreat the waste for further limiting their interaction with the cement. What complicates the process and can increase the volume of waste to be packaged.

11. SULFO-ALUMINOUS CEMENTS Sulfo-aluminous cements could be an attractive alternative to cement and calcium silicate. By participating in the hydration reactions of the binder, borates and sulphates of the waste are incorporated in a non-expansive ettringite phase. Exploratory laboratory tests were performed on a synthetic waste consisting of mud mixed with a chemical coprecipitation concentration evaporator

12. SULFO-ALUMINOUS CEMENTS The use of a binder sulfo-aluminous partial replacement of cement is common source of significant progress, borates of waste did not block the binding decision of sulfo-aluminous, the waste can be cemented without prior pretreatment, which allows simplify the process and avoid the increase in volume due to the addition of reagents pretreatment.

13. CONCLUSION These first promising results of sulfo aluminous cements can conclude that the scientific feasibility. Compostel process, the use of sulfo- aluminous cement instead of ordinary cements leads to little or no modification of existing facilities cementation, this link is easy to implement.

14. THANK FOR YOUR ATTENTION