Agitating – Mortar mixer type – With ingredient proportioning
Patent
1979-04-05
1980-10-07
McCarthy, Edward J.
Agitating
Mortar mixer type
With ingredient proportioning
366 1, 366 8, 366 18, 366 40, B28C 704
Patent
active
042265428
ABSTRACT:
A slurry reclamation system for use with a concrete ready-mix plant which enables 100% reclamation of the constituents of concrete mix returned to the plant site by vehicles.
Returned concrete mix is dumped into an inlet hopper having a screw classifier for removing aggregate and coarse sand, and a weired channel enabling gravity flow of the water, cement fines and sand fines constituents into a slurry vessel. The slurry in the vessel naturally separates into clarified water and concentrated slurry, and agitators are provided for periodically stirring up the slurry to maintain the cement fines active. The slurry vessel is sized in such a manner as to guarantee complete consumption of slurry returned during a day's production by the end of the following production day, the volumetric capacity of the vessel being related to the total average volume of water used to produce fresh concrete during a representative production day.
An autochangeover unit automatically switches the water supply to truck washout stations and the screw classifier between normal plant supply water and the clarified water in the vessel, depending upon the level of the latter.
The system enables substitution of slurry for cement fines alone, sand alone, water alone, or any combination of these concrete constituents in accordance with the percent activity of the cement fines in the slurry and production demand.
REFERENCES:
patent: 3004544 (1961-10-01), Guptill
patent: 3083423 (1963-04-01), Hartley
patent: 3300193 (1967-01-01), Badgett
patent: 3379421 (1968-04-01), Putman
patent: 3593966 (1971-07-01), Munroe
Black Melvin L.
Bowen Robert C.
McCarthy Edward J.
Weigh-Tech, Inc.
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