Methods for the extrusion of novel, highly plastic and moldable hydraulically settable compositions
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United States of America Patent
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Aug 27, 1996
Issued Date -
N/A
app pub date -
Jun 7, 1994
filing date -
Aug 11, 1992
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Abstract
Hydraulically settable mixtures and methods for extruding such mixtures into a variety of objects which are form-stable in the green state. High green strength is achieved by increasing the yield stress of the mixture while maintaining adequate extrudability. Optimizing the particle packing density while including a deficiency of water yields a hydraulically settable mixture which will flow under pressures typically associated with the extrusion of clay or plastic. In addition, a rheology-modifying agent can be added to increase the yield stress of the mixture while not significantly increasing the viscosity. The desired strength properties and other performance criteria of the final hardened extruded product are controlled by adding aggregates, fibers, a hydraulically settable binder, water, and other admixtures.
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