A PROCESS FOR THE PREPARATION OF A PUMPABIE AND SPRAYABLE CONCRETE MIX AND AN AIRPIACING UNIT FOR PREPARING THE SAID CONCRETE MIX
To apply a layer of spray concrete to a surface, a pumpable and sprayable spray concrete mix is made up from cement, aggregates, if appropriate additives, and water. A preset mass flow of the spray concrete mix is sprayed by means of a concrete delivery pump through a concrete transfer line to a spr...
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Main Authors | , |
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Format | Patent |
Language | English |
Published |
26.10.1991
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Edition | 5 |
Subjects | |
Online Access | Get full text |
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Summary: | To apply a layer of spray concrete to a surface, a pumpable and sprayable spray concrete mix is made up from cement, aggregates, if appropriate additives, and water. A preset mass flow of the spray concrete mix is sprayed by means of a concrete delivery pump through a concrete transfer line to a spray gun with a device for introducing propellant air under a delivery pressure of several bar. The propellant air is laden with synthetic silica having a BET surface area of at least 25 m /g. With the propellant air, the synthetic silica is introduced into the mass flow of the spray concrete mix in such a quantity that the applied spray concrete undergoes a spontaneous temperature increase by a few degrees Kelvin immediately after the application. A spray gun for the process is also described. |
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Bibliography: | Application Number: IN217CA1988 |