A device and method device for continuous mixing and laying of cementitious coating onto a substrate. There is a first mixing stage for metering and mixing a first liquid and a second liquid to create a first mix and a second mixing stage for metering and mixing the first mix with aggregate to form a second mix. The first and second mixing stages use flow meters and flow controllers for metering and restricting the flow of the first liquid, the second liquid and aggregate. A controller operatively coupled to the flow meters and flow controllers controls the mixing in a closed-feedback arrangement. A screed box applies the second mix onto the substrate to create a flooring layer. The flooring may be in a food processing plant.

The invention relates to a dry mineral binder composition comprising cement and mineral fillers for the manufacture of molded parts by way of 3D printing. The binder composition additionally contains at least one aluminum sulfate-based accelerator, at least one polycarboxylate ether-based super-plasticizer and at least one rheology additive.

According to one or more embodiments of the present invention, modification of concrete within a pumping line is achieved with new designs of inline static mixers allowing passage of concrete material that is primarily of solids in the form of suspended minerals, cement and aggregates, and without benefit of the flow of additional fluid, such as the airflow driving a shotcrete process. According to one or more embodiments of the present invention, modification within a concrete pumping line is essential where unmodified concrete is necessary for purposes of batching or pumping, such as where the modification creates a very rapid set or an extreme thickening. According to one or more embodiments of the present invention, modification, unmodified concrete can be delivered to the point of inline modification at the end of a pumping line, where highly reactive components can then be intermixed. According to one or more embodiments of the present invention, this allows volume production of Roman Concrete or a hot mortar activated with quicklime, facilitates the inclusion of highly reactive shrinkage compensating agents, makes the use of alkali-activated or geopolymer concrete more practical for large-scale production, and makes possible very rapid additive-manufacturing methods with low-cost conventional delivered concrete.

A pretreatment mixing and stirring device includes a cylindrical housing having a top plate, a bottom plate arranged to oppose to the top plate, a side plate arranged between the top plate and the bottom plate, and a mixing and stirring region where a calcined gypsum and an additive are mixed and stirred in an interior surrounded by the top plate, the bottom plate, and the side plate, a disk-shaped rotating plate arranged inside the housing, a rotating drive shaft, penetrating the top or bottom plate, and coupled to the rotating plate, a calcined gypsum supply port, arranged in the top plate, and supplying the calcined gypsum to the mixing and stirring region, and an additive supply port, arranged in at least one of the top and side plates, and supplying the additive to the mixing and stirring region.