Cementation


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Related to Cementation: Cementation process

cementation

[‚sē‚men′tā·shən]
(chemistry)
The setting of a plastic material.
(engineering)
Plugging a cavity or drill hole with cement. Also known as dental work.
Consolidation of loose sediments or sand by injection of a chemical agent or binder.
(geology)
The precipitation of a binding material around minerals or grains in rocks.
(metallurgy)
High-temperature impregnation of a metal surface with another material.
Conversion of wrought iron into steel by packing layers of bars in charcoal sealed with clay and heating to 1000°C for 7-10 days.

Cementation

 

in construction, the consolidation of soils, rocks, and stone or concrete masonry by injecting a cement solution or suspension into voids, cracks, or pores. The process is used to strengthen the beddings of structures; to provide seepage barriers; and to waterproof rocks in tunnels, mine shafts, and stone and concrete masonry, as well as to reduce the porosity of such masonry.


Cementation

 

in nonferrous metallurgy, a hydrometallurgical process based on the displacement of the more electropositive metals from solutions of their compounds by less electropositive metals in the solid state. For example, the normal electrode potential of copper is +0.344 volts, and that of zinc is –0.762 volts; the difference between the potentials makes it possible to obtain the reaction Cu2+solution + Znmetal → Zn2+solution + Cumetal. The greater the difference in potentials, the lower the content of precipitated metal that will remain in the solution. Cementation is extensively used to remove impurities from solutions and to recover metals from solutions. The process can also be used to precipitate metals from molten slags.

REFERENCES

Plaksin, I. N., and D. M. Iukhtanov. Gidrometallurgiia. Moscow, 1949.
Maslenitskii, I. N., and L. V. Chugaev. Metallurgiia blagorodnykh melallov. Moscow, 1972.
Naboichenko, S. S., and V. I. Smirnov. Gidrometallurgiia medi. Moscow, 1974.

cementation

The setting of a cement.
References in periodicals archive ?
The result confirmed that cementation was significantly associated with a lower recurrence rate than bone grafting ( ?
In December 2015 Cementation purchased Merit Consultants International, a provider of project and construction management services to clients in the international mining community.
This step provides an increased surface area, micromechanical retention and a clean surface for adhesive cementation.
The Periotest device has the advantage of measuring the implant stability at any stages from implant placement to crown elaboration and even many years after the crown cementation.
Onshore casing & cementation hardware, due to large number of operational onshore wells, is expected to dominate the global casing & cementation hardware market.
The shade of the ceramic restoration with a resin cement layer was evaluated by cementation after the resin disc surface was etched with 37% phosphoric acid (Etch, Schaan Liechtenstein, Ivoclar Vivadent) for 10 seconds, washed with an air/water jet for 15 seconds, coated with an adhesive system (Excite) for 10 seconds, and light activated for 10 seconds.
The cementation process was a breakthrough as it produced much better and harder steel, and more of it," says Dr Webster.
With its combination of technology and features, RelyX Unicem 2 Automix Cement is meant to be suited for the permanent cementation of all-ceramic, composite or metal inlays, onlays, crowns and bridges, as well as posts and screws, and is also designed to be used for cement restorations to implant abutments, as well as Maryland, inlay and onlay bridges.
BANKING AND CREDIT NEWS-27 July 2010-ICRA sets LBBB+ rating to ITD Cementation India enhanced bank facilities(C)1994-2010 M2 COMMUNICATIONS http://www.
Chapters cover areas such as vacuum evaporation, cathode sputtering, ion beam assisted deposition, and pack cementation.
Rizvan Sulejmani sees the cause for cementation of the third option in the deficit of intellectuals.