(57) The invention refers to a method of producing concrete in a mobile computer controlled
concrete station (22) for the production of concrete mixtures, comprising cement,
aggregate material of gravel and sand, and water, with or without superplasticizers.
In the concrete station, that is realized for computer control of the mixing processes,
the aggregate material is supplied to a telescopic sorter device (2) for screening
and distributing the aggregate material according to size to a plurality of collecting
cells (3). A system of trap doors (4) and valves (5) in co-operation with electronic
equipment for the weighing of the aggregate material in exact proportion by means
of a weighing drum (6), is computer controlled. The content of the weighing drum (6)
is transferred to a mixer drum (7) by pneumatic means. A preprogrammed amount of water,
ahd, if desired, amounts of superplasticizers are supplied from tanks (12) to the
mixer drum through pipes. The mixer drum is provided with means for electric measurement
of the ZETA-potential difference or of the conductivity in the cement paste. Using
these measuring quantities and nominal values for water and for the used kind of superplasticizers,
the consistency of the mix can be controlled through computer controlled supply of
water and superplasticizers under due observance of said nominal values.
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