DETAILED DESCRIPTION Referring first to FIG.
1, a mixing vessel 10 has an upper cylindrical metallic wall section 11, and a lower conical wall section 12.
Section 12 has a lower central discharge opening downwardly at 12b into an impeller 13 rotated about central vertical axis 14, as by a drive or motor 15.
The latter is located beneath impeller housing 16.
Slurry is discharged downwardly into the "eye" or center of the rotating impeller, the housing 16 having a side outlet at 16a for discharge of mixed cementitious slurry to a duct 17 leading to a rotating concrete mixer 18 on a truck 19.
Wet sand and aggregate are also fed to the mixer 18, at 20.
Dry Portland cement is fed as at 21 to the vessel 10, and water is fed at 22.
The cement screw 22 is controlled at 23, and the water delivery is controlled as by a valve 24, to deliver water and cement in the correct proportions to the upper interior of vessel 10, for mixing therein.
Rotation of the impeller 13 is controlled by control 23 for the motor 15, to cause the impeller to induce rotation of the slurry 25 in the vessel, the slurry flow spiraling downwardly as indicated at 26, toward the outlet 12b, for flow into the impeller.
Some upward recirculation of slurry from lower region 29 can, or does, occur as indicated by arrows 27 adjacent the inner sides of the vessel walls.
A vortex is created by the rotating slurry, whereby the rotating slurry is centrifugally urged toward the vessel wall, creating a central "well" or open region, inwardly of broken line 25a, which has the shape of an inverted dome.
Mechanism to weigh the vessel and its contents may include the transducers or load cells 30 supported at 31, and supporting a horizontal flange 32 attached to the vessel.
See weight indicator 33, and by which the amount of cement and water in the vessel may be determined for batch volume control.
In accordance with the invention, vibration is transmitted into the moving slurry in vessel, as for example sidewardly into the spiraling mass of slurry 25
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Light Fixtures 
