Conveyors: fluid current – With adjunctive substance added – Solid
Patent
1990-02-12
1991-02-19
Focarino, Margaret A.
Conveyors: fluid current
With adjunctive substance added
Solid
406 46, 406 48, 406197, 406191, 406194, 106737, B65G 5300, B65G 5352
Patent
active
049938843
ABSTRACT:
Method of applying a layer of air-sprayed concrete onto a surface, wherein a pumpable and sprayable mixture of air-sprayable concrete is prepared from cement, aggregates, optional additives, and water. A given mass flow of the mixture of air-spray concrete is sprayed by means of a concrete feed pump through a concrete feed line to a spraying apparatus with a device for the introduction of propelling air under a feed pressure of several bars. The propelling air is charged with synthetic silica exhibiting a BET surface of at least 25 m.sup.2 /g. The synthetic silica is added with the propelling air into the mass flow of the mixture of air-spray concrete in such an amount that the applied air-spray concrete experiences a spontaneous temperature elevation of a few degrees Kelvin immediately after application. A spraying apparatus for the method is also shown.
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Article, "New Process for Wet Application of Shotcrete" (Pohl et al.) date 2/90.
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Winnacker-Kuchler, Chemische Technologie, vol. 3, Anorganische Technologie II, 4th Ed., Carl Hanser Verlag, Munich/Vienna, 1983, pp. 75-90.
Barthel Walter
Mueller Karl-Hans
Degussa - Aktiengesellschaft
Focarino Margaret A.
Kannofsky James M.
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