A coating method of a board for producing a concrete product and a board coated by the same are proposed. The coating method is advantageous in that the whole surface of a board can be rapidly coated and dried to prevent surface corrosion of the board and to prevent further corrosion on a damaged surface of the board, thus improving the durability of the board and the quality of the produced concrete products. The coating method includes: removing residues existing on an outer surface of the board by blowing high-pressure air to an upper surface and a lower surface of the board for producing a concrete product; coating by spraying coating liquid to the outer surface of the board from which the residues have been removed; and drying the coating liquid by blowing high-pressure air to the outer surface of the board.

A mold for building coating products obtained from composite liquid mixtures is described. The mold includes a base plate, having a plurality of through holes; and a die, configured for incorporating the base plate therein. On the upper surface of the die there are a plurality of shapes of the front surface in negative of each coating product to be manufactured and a molding grid open at the upper part, configured to be pressure applied above the die. The molding grid has side walls which define the perimeter edges of each coating product. Between the molding grid side walls separate bowls are formed for containing a single coating product. Each side wall is inclined at an acute angle with respect to a vertical plane, to confer to each side wall a sharp-pointed and tapered shape from top towards bottom with respect to the entire mold for facilitating the extraction of the finished coating products.

An automated system and associated method of producing manhole products includes an area closed production loop where molds are moved to discrete workstations. A standard set of tasks (e.g., mold cleaning and release agent application, reinforcement placement, pre-pouring activities and inspection, filling, curing, and product demolding) are performed at various ones of the workstations. Once one of these tasks is completed, the mold moves to the next workstation. This enables a transition from ‘cast on the floor’ method to an assembly line principle.

A method for manufacturing a concrete article is disclosed. The method comprises coating a mould or formwork with a release agent; spraying a mortar onto the mould or formwork, thereby forming a layer of mortar; casting concrete into the mould or formwork and onto the layer of mortar; and allowing the concrete to hydrate and harden in the mould or formwork, whereby a concrete article having a mortar skin layer is provided. The invention also provides concrete articles made by the described methods, and concrete structures which comprise the concrete articles. Concrete articles having the mortar skins can be made to have a relatively uniform outward appearance, even if the concrete cast behind the mortar skins may be different, in composition or appearance. Pigments or colorants and other expensive admixtures can be used in the mortar skin composition to greater visual effect, since the use of the mortar skin is less in overall volume compared to the concrete articles as a whole.

In summary, the invention concerns a mold frame for the production of molded pieces, comprising: at least one mold cavity, the at least one mold cavity being defined by a plurality of mold walls, wherein at least one mold wall of the mold cavity is a mold wall that is displaceably attached to the mold frame.

A coating method of a board for producing a concrete product and a board coated by the same are proposed. The coating method is advantageous in that the whole surface of a board can be rapidly coated and dried to prevent surface corrosion of the board and to prevent further corrosion on a damaged surface of the board, thus improving the durability of the board and the quality of the produced concrete products. The coating method includes: removing residues existing on an outer surface of the board by blowing high-pressure air to an upper surface and a lower surface of the board for producing a concrete product; coating by spraying coating liquid to the outer surface of the board from which the residues have been removed; and drying the coating liquid by blowing high-pressure air to the outer surface of the board.

In summary, the invention concerns a mold frame for the production of molded pieces, comprising: at least one mold cavity, the at least one mold cavity being defined by a plurality of mold walls, wherein at least one mold wall of the mold cavity is a mold wall that is displaceably attached to the mold frame.

A self-contained portable solar powered fluid pump dispenser for concrete release agents having a movable supporting base pallet upon which a bulk container of release agent fluid is carried, along with a supporting framework which carries a solar panel, electric pump and rechargeable battery that is energized by the solar panel. An elongated dispensing hose is coiled on a hose reel carried by the supporting framework, such that the dispensing hose and dispensing wand connected thereto may be efficiently stored when not in use. The solar powered pump is fluidly sealed between the bulk container of release agent fluid and the dispensing wand to prevent undesirable contaminants from entering the fluid dispensing system.

A method for casting a preform part for reaction bonding, the method comprising coating an inner surface of a mold and a mandrel surface with release layers. An assembled mold is formed from the mold and the mandrel and a preform cake is formed by pouring a slurry into a mold cavity and letting it settle. Thermally removing the release layers aids in removing the mandrel and removing the preform cake after pyrolyzing.

A method for manufacturing a concrete article is disclosed. The method comprises coating a mould or formwork with a release agent; spraying a mortar onto the mould or formwork, thereby forming a layer of mortar; casting concrete into the mould or formwork and onto the layer of mortar; and allowing the concrete to hydrate and harden in the mould or formwork, whereby a concrete article having a mortar skin layer is provided. The invention also provides concrete articles made by the described methods, and concrete structures which comprise the concrete articles. Concrete articles having the mortar skins can be made to have a relatively uniform outward appearance, even if the concrete cast behind the mortar skins may be different, in composition or appearance. Pigments or colorants and other expensive admixtures can be used in the mortar skin composition to greater visual effect, since the use of the mortar skin is less in overall volume compared to the concrete articles as a whole.