Method and spraying apparatus for applying a layer of air-sprayed concrete
First Claim
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1. A method for applying a layer of air-sprayable concrete onto a surface, comprising:
- providing a pumpable and sprayable mixture of air spray concrete comprising cement, aggregates, and water;
feeding a given mass flow of the mixture of air sprayable concrete so obtained through a concrete feed means to spraying means;
introducing propelling air into said concrete feed means at a feed pressure above atmospheric; and
mixing precipitated silica having an inner surface in a range between 35-700 m2 /g with said cement such that said air-spray concrete includes precipitated silica and the mixture of air-sprayable concrete and silica is sprayed with the propelling air and, while said air sprayable concrete is being sprayed by the propelling air, the mixing of the water and the precipitated silica results in the water being spontaneously drawn out from the concrete by action of attachment to the silica, and said precipitated silica and propelling air are introduced into the mass flow of said mixture of air sprayable concrete in such an amount that the applied air-sprayed concrete experience a spontaneous temperature elevation of at least 2 degrees Kelvin immediately after the application of said sprayable concert to a surface.
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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 m2 /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.
21 Citations
15 Claims
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1. A method for applying a layer of air-sprayable concrete onto a surface, comprising:
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providing a pumpable and sprayable mixture of air spray concrete comprising cement, aggregates, and water; feeding a given mass flow of the mixture of air sprayable concrete so obtained through a concrete feed means to spraying means; introducing propelling air into said concrete feed means at a feed pressure above atmospheric; and mixing precipitated silica having an inner surface in a range between 35-700 m2 /g with said cement such that said air-spray concrete includes precipitated silica and the mixture of air-sprayable concrete and silica is sprayed with the propelling air and, while said air sprayable concrete is being sprayed by the propelling air, the mixing of the water and the precipitated silica results in the water being spontaneously drawn out from the concrete by action of attachment to the silica, and said precipitated silica and propelling air are introduced into the mass flow of said mixture of air sprayable concrete in such an amount that the applied air-sprayed concrete experience a spontaneous temperature elevation of at least 2 degrees Kelvin immediately after the application of said sprayable concert to a surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A concrete spraying apparatus, comprising:
means for the introduction of propelling air comprising a straight guide tube (1) for propelling air, at least one supply tube (3), obliquely oriented into the straight guide tube (1) at an angle of introduction and in the direction of spraying, for the mixture of air-sprayed concrete which includes cement, and spraying material comprising precipitated silica with the precipitated silica added to said concrete in an amount of approximately 0.5-8% by weight in relation to the amount of cement and said precipitated silica having an inner surface are within the range of about 35 to 700 m2 /g. - View Dependent Claims (12, 13)
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14. A concrete spraying apparatus, comprising:
straight guide tube means (1) for the propulsion of cement and for the mixture of air-sprayable concrete, at least one supply tube (3), introduced obliquely into the straight tube in the direction of spraying, for the propelling of air charged with precipitated silica, said precipitated silica comprising 0.5-8% by weight of the cement and having an inner surface within the range of about 35 to 700 m2 /g. - View Dependent Claims (15)
Specification
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Current AssigneeDegussa AG (Rag-Stiftung)
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Original AssigneeDegussa AG (Rag-Stiftung)
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InventorsMueller, Karl-Hans, Barthel, Walter
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Primary Examiner(s)Focarino, Margaret A.
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Assistant Examiner(s)Kannofsky, James M.
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Application NumberUS07/478,752Time in Patent Office372 DaysField of Search406/46-49, 406/92, 406/93, 406/96, 406/98, 406/151, 406/153, 406/194-197, 406/191, 106/98US Class Current406/49CPC Class CodesC04B 14/062 Microsilica, e.g. colloïdal...C04B 2111/00146 Sprayable or pumpable mixturesC04B 2111/00482 Coating or impregnation mat...C04B 40/0028 Aspects relating to the mix...E04G 21/04 Devices for both conveying ...
