Abstract: The extrusion of a green body from a paste or suspension of particulate solids in a liquid is conducted by a process which includes the steps of introducing flowable paste or suspension into an inlet end of a moulding passage which is defined by walls having at least one partially liquid-permeable wall section; applying pressure to the paste or suspension, thereby to remove from the passage at least a major portion of the liquid of the paste or suspension, by establishing a pressure differential across the liquid permeable section, so as to form in the passage a non-flowable body of consolidated particulate solids of the paste or suspension, and to extrude the non-flowable body progressively from an outlet end of the passage.

Abstract: A cementitious pipe as a tubular wall of fibre-reinforced cementitious pseudo strain hardening (PSH) matrix. The matrix and a wall thickness to diameter ratio within a range are such that the pipe exhibits characteristic behaviour in diametral quasi-static bending under a 3-edge bearing method. The behaviour is such that a stress versus relative displacement curve for the pipe exhibits a substantially linear elastic region having a first slope within first limits, and from the LOP to the MOR for the pipe, a PSH region which, beyond a possible transition region, has a slope which is less than that of the elastic region and is within second limits.

Abstract: Shaped bodies of particulate material are produced by introducing an easily flowable slurry of water and particulate material into a mold with perforated walls and applying a sufficiently high pressure to the slurry in the mold so as to express a sufficient proportion of the liquid to allow physical contact and interengagement between the particles. The extrusion is carried out continuously in an extension process including: (A) introducing the slurry under high pressure, (B) conveying the slurry through a shaping section to (C) a draining and consolidation section with drain holds or slits (3), to leave the extruder through (E) an exit section in the form of a solid body (4).

Abstract: In a process and apparatus for the extrusion of a green body from a paste or suspension of particulate material in a liquid, the suspension is supplied to and substantially fills an extrusion chamber at a relatively low pressure. A high pressure is applied to the suspension on completion of filling whereby the suspension is forced through a moulding spaced with a dewatering section defined by at least partially liquid-permeable walls. A substantial part of the liquid is removed by establishing a pressure differential across at least parts of the wall that are permeable to said liquid, to form a non-flowable shaped body of the particulate material.

Abstract: Shaped bodies of particulate material produced by introducing an easily flowable slurry of water and particulate material into a mold with perforated walls and applying a sufficiently high pressure to the slurry in the mold so as to express a sufficient proportion of the liquid to allow physical contact and interengagement between the particles. The method may be carried out continuously in an extension process including: (A) introducing the slurry under high pressure, (B) conveying the slurry through a shaping section to (C) a draining and consolidation section with drain holds or slits (3), to leave the extruder through (E) an exit section in the form of a solid body (4).

Abstract: Shaped bodies of particulate material are produced by introducing an easily flowable slurry of water and particulate material into a mold with perforated walls and applying a sufficiently high pressure to the slurry in the mold so as to express a sufficient proportion of the liquid to allow physical contact and interengagement between the particles. The extrusion is carried out continuously in an extension process including: (A) introducing the slurry under high pressure, (B) conveying the slurry through a shaping section to (C) a draining and consolidation section with drain holds or slits (3), to leave the extruder through (E) an exit section in the form of a solid body (4).

Abstract: A method for producing shaped bodies of particulate material by introducing an easily flowable slurry of water and particulate material into a mold with perforated walls and by applying a sufficiently high pressure to the slurry in the mold so as to express a sufficient proportion of the liquid to allow physical contact and interengagement between the particles. The method may be carried out continuously in an extrusion process including introducing the slurry under high pressure into a extruder and conveying the slurry through a shaping section of the extruder to a draining and consolidation section of the extruder with drain holes and slits whereby a non-flowable, consolidated, shaped body leaves the extruder through an exit section.