초록 ▼

Hydraulically settable mixtures and methods for extruding such mixtures into a variety of objects which are form-stable in the green state are disclosed. High green strength is achieved by increasing the yield stress of the mixture while maintaining adequate extrudability. Optimizing the particle pa

Hydraulically settable mixtures and methods for extruding such mixtures into a variety of objects which are form-stable in the green state are disclosed. 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.

대표청구항 ▼

An article of manufacture having a hydraulically settable matrix formed by the process comprising the steps of: combining a hydraulically settable binder, at least one aggregate, a rheology-modifying agent, and water to form a hydraulically settable mixture, the hydraulically settable binder and at

An article of manufacture having a hydraulically settable matrix formed by the process comprising the steps of: combining a hydraulically settable binder, at least one aggregate, a rheology-modifying agent, and water to form a hydraulically settable mixture, the hydraulically settable binder and at least one aggregate material each comprising a plurality of particles which form a combination of particles that are in an initial state of natural packing density, the hydraulically settable mixture having an initial net deficiency of water such that the mixture is initially granular and substantially noncohesive; extruding the hydraulically settable mixture under an extrusion pressure sufficient to increase the initial packing density of the combination of the hydraulically settable binder particles and aggregate material particles, thereby reducing the initial net deficiency of water, causing the hydraulically settable mixture to become cohesive, and causing the mixture to flow through a die to form an extruded article of manufacture of a desired shape that is immediately form stable upon being extruded through the die; and allowing the extruded article of manufacture to cure to form the hydraulically settable matrix of the article.