Abstract: A novel process for preparing a pre-cast terrazzo panel having detailed, multicolor designs therein constituted by background and inlay designs of different colors. The inlay and background colors are integral with no surface difference between the inlay and the background. The process involves the steps of (a) providing a pre-cast unpolished terrazzo panel with a first background color; (b) cutting out an inlay pattern or design in the terrazzo panel to create a silhouette cut-out panel; (c) placing the cut-out panel in a mold, pouring a blend of a second color comprising a binder and aggregate into the cut-out and curing the blend to create a cured inlay of a second color in the panel; (d) repeating steps (b) and (c) as often as desired with blends having colors the same or different from the first and second colors; and (e) polishing the resulting panel to produce a terrazzo panel having a plurality of colors.

Abstract: A process for forming a concrete wall having a projecting portion such as those formed at a door, windows or the like, including installing two spaced apart opposite form boards which confine a cavity for receiving concrete, one of which has a groove for forming the projecting portion, lining the wall segments with a cushion member which is made of a flexible and compressible material, pouring concrete into the cavity, and moving simultaneously the form board from the formed concrete in a direction similar to the direction of the projecting portion utilizing a hydraulic drive mechanism.

Abstract: A tube or hollow body of a plastic material having memory characteristics is formed in a mold body having interior undulations or grooves. Pressure is applied to the interior of the plastic tube, while the tube is at a temperature above its softening point, to expand the tube into the configuration of the interior of the mold body. The pressure is maintained while the tube is cooled. After cooling, the tube is extracted axially from the mold body, and is reheated to cause the tube, by virtue of its memory characteristics, to return to the shape it had while in the mold, thereby eliminating the distortion and stretching occurring during removal from the mold. The mold body can be a tubular corrugated casing or stainless steel with a relatively thin wall, which cannot be taken apart. End assemblies are provided to hold and seal the tube ends while the tube is expanded in the mold body, by pressure applied through one of the end assemblies. The preferred plastic material is PTFE (TEFLON).

Abstract: A method of manufacturing bricks with smooth surfaces includes the steps of providing a mould container with a movable bottom, washing the mould container, placing a layer of releasing material in the mould container, filling the mould container with clay and trimming off the container. Only the bottom of the container is filled with a releasing material and the bottom of the container is moved so that it is virtually outside of the mould container.