| 摘要 |
The invention specifies a process for producing floating cement screeds, in which process first of all a pulverulent liquefier and a pulverulent stabiliser are added to the pulverulent cement. These additives are added to a part-volume of the cement and the entire cement quantity is rapidly mixed, using a turbine agitator, with the total amount of water required for the screed composition until a cement paste is formed. The cement paste is mixed in a further, separate mixer with the sand portion and the resulting free-flowing screed composition is pumped to the place of application and is levelled off on the building floor, essentially of its own accord, with a little low-frequency, mechanical assistance. An apparatus for producing the cement paste comprises a turbine agitator which runs around a vertical axis and the blades of which are restricted such that they press the material, which is to be mixed, against the base of the mixing trough which encloses the turbine agitator. A spiral pump for drawing off the cement paste is driven via an intermediate part which extends beneath the turbine agitator and through the mixing trough, has a non-round cross-section and thus, on the one hand, prevents the composition, which is to be mixed, from rotating with the turbine agitator and, at the same time, itself achieves a mixing action.
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