Method and apparatus for continuous production of colloidally-mixed cement slurries and foamed cement grouts
OwnerPatrick J. Stephensinventor
Life of this patent
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Abstract
An apparatus for high capacity production of high-fluidity, colloidally mixed cement slurry. Water and cement dust are combined at metered rates by a premixing assembly which discharges into a mixing tub. The high-speed, high-shear pump recirculates the material through the tub to produce the colloidally-mixed slurry. The high-fluidity slurry may be provided to a second pump, preferably of the positive-displacement, progressive-cavity, rotor-stator type, for supplying the slurry at a metered rate. Finished foam material may also be provided to the slurry metering pump at the metered rate, so the materials are mixed to form a foamed cement grout in which the weight and quality of the material is precisely adjustable.
Claims23
An apparatus for high-capacity production of high-fluidity cement slurry which is substantially free of aggregate material, said apparatus comprising:
- means for providing a supply of hydraulic cement dust at an adjustable, metered rate;
- means for providing a supply of water at an adjustable, metered rate;
- means for mixing said metered supply of cement dust with said metered supply of water to produce an initial cement slurry having a water-to-cement ratio which is precisely adjustable by adjusting said metered rates at which said water and cement dust are provided thereto;
- and
- means for colloidally mixing said initial cement slurry which is produced by said mixing means so as to produce a high-fluidity colloidally-mixed hydraulic cement slurry which is substantially free of aggregate material.
A method for high capacity production of high-fluidity cement slurry which is substantially free of aggregate material, said method comprising the steps of:
- providing a supply of hydraulic cement dust at an adjustable metered rate;
- providing a supply of water at an adjustable, metered rate;
- mixing said metered supply of cement dust with said metered supply of cement slurry to produce an initial cement slurry having a water-to-cement ratio which is precisely adjustable by adjusting said rates at which said water and cement dust are provided;
- and
- colloidally mixing said initial cement slurry so as to produce a high-fluidity colloidally-mixed hydraulic cement slurry having said precisely adjustable water-to-cement ratio and which is substantially free of aggregate material.
Dependencies are inferred from the claim text.