The invention relates to a system for extrusion of filaments of construction material enriched with aggregates and/or steel fibers, referred to as loaded material, for a robot for additive manufacture of architectural structures comprising: a head (100) for printing filaments of construction material comprising an inlet opening (110) for material and an outlet nozzle (120) for material; a circuit (10) for supplying material to said print head (100) comprising a reservoir (20) for storing loaded material and a conduit (31) for supplying material, connecting said storage reservoir (20) and said print head (100); characterized in that said supply circuit (10) comprises at least one piston pump (40) mounted on said supply conduit (31) and in that said print head (100) comprises an endless screw (150) arranged between said inlet opening (110) and said outlet nozzle (120) and configured to be able to extrude the loaded material in a continuous manner via said outlet nozzle.

A mixer for ceramic feedstock pellets with a tank, a mixing shaft, and a heat exchanger including a cooler for the cooling of the content of this tank is provided. A controller controls the heat exchanger which includes a heater arranged to heat the content of this tank to a temperature comprised between a lower temperature (TINF) and a higher temperature (TSUP) stored in a memory for a specific mixture, and the heater exchanges energy with a heat exchange and mixing temperature maintenance circuit, external to this tank, and wherein the thermal inertia of this circuit is higher than that of this fully loaded tank. The invention also concerns a method for mixing raw material for powder metallurgy, implementing a specific injection molding composition and a specific binder.

A method for casting a hollow core concrete product with a substantially horizontal slipform casting process, where concrete mass is fed at least in one feeding stage through a limited cross-section (5, 6, 7) moving progressively along with the cast, and at least one core is formed in the concrete product to be cast with a core forming member (4), wherein the thickness of webs between the cores of the product to be cast are changed during the slipform casting process by changing the width of the at least one core forming member (4). The invention also relates to such an apparatus and a core forming member.

A print head for printing three-dimensional structures made of concrete and a method used to deposit layers of concrete material one on top of the other. The print head is configured to be moved in space and to deposit individual layers of a concrete material, which forms the structure to be produced, one on top of the other. The print head includes a feeder configured to provide the concrete material, a conveying device configured to receive the concrete material from the feeder and to convey it, a shaping section configured to be filled with the pressurized concrete material and to define lateral dimensions of the layer to be deposited, an exit section pointing in a direction opposite to a feed direction of the print head, and an exiting prevention section configured to prevent the concrete material from exiting in the feed direction of the print head.

A print head for printing three-dimensional structures made of concrete and a method used to deposit layers of concrete material one on top of the other. The print head is configured to be moved in space and to deposit individual layers of a concrete material, which forms the structure to be produced, one on top of the other. The print head includes a feeder configured to provide the concrete material, a conveying device configured to receive the concrete material from the feeder and to convey it, a shaping section configured to be filled with the pressurized concrete material and to define lateral dimensions of the layer to be deposited, an exit section pointing in a direction opposite to a feed direction of the print head, and an exiting prevention section configured to prevent the concrete material from exiting in the feed direction of the print head.

A method for manufacturing a prefabricated concrete product is disclosed, in which method, a concrete slab with a recess at its upper surface is cast with slipform casting on a casting bed, and after the slipform casting of the slab the recess of the fresh cast slab is equipped with ducts, piping and/or wiring components, after which the recess is covered with concrete mass, and the concrete product is left to cure. The invention also relates to such a prefabricated concrete product.

Mixer for ceramic feedstock pellets with a tank, a mixing means, and heat exchange means including cooling means for the cooling of the content of this tank.

Control means control the heat exchange means which include heating means arranged to heat the content of this tank to a temperature comprised between a lower temperature (TINF) and a higher temperature (TSUP) stored in a memory for a specific mixture, and the heating means exchange energy with a heat exchange and mixing temperature maintenance circuit, external to this tank, and wherein the thermal inertia of this circuit is higher than that of this fully loaded tank.

The invention also concerns a method for mixing raw material for powder metallurgy, implementing a specific injection moulding composition and a specific binder.

The invention relates to an auger feeder of concrete mix having a helical segment, which auger feeder has at least one insert (22), which is manufactured of material that is softer than that used for manufacturing the auger feeder's helical segment. One insert (22) is mounted on a downstream end of the auger feeder. The invention also relates to a method of manufacturing an auger feeder, which method includes manufacture of a helical segment of the auger feeder, in which method at least one insert is manufactured from a material softer than that used for the auger feeder's helical segment. The insert (22) is to be mounted on a downstream end of the auger feeder of the casting of the auger feeder's helical segment.

A mixing segment for an extrusion apparatus comprises a shaft and a plurality of plow elements aligned along a helical path extending about a rotation axis of the shaft. Each plow element includes an outer peripheral arcuate ramp extending radially outwardly along the helical path from a root to an outer tip of the plow element. Methods of manufacturing a mixing segment and methods of manufacturing a honeycomb structure with an extrusion apparatus are also provided.

A method for 3D printing a construction using a printing unit includes obtaining a precursor printing material, the precursor printing material including a binder, water, and sand; forming a flow of the precursor printing material towards the printing unit using a material pump; adding downstream of the material pump an amount of a first additive to the precursor printing material; optionally adding one or more additional additives; mixing the precursor printing material, the first additive and the optional one or more additional additives to form the printing material; and extruding the printing material via the printing head.