Abstract:
A method of forming a geopolymer moulded product comprising: forming a geopolymer concrete composition comprising an alkali or alkaline earth metal silicate component, an alkali or alkaline earth metal hydroxide, aggregate and water wherein the water content is insufficient to provide a slumped concrete and the ratio of SiO2 to M2O is at least 0.8; and casting the concrete into a mold and subjecting the moulded concrete to consolidation in the mold.
Abstract:
A mold and a product molded in the mold comprises a square block having a bottom face, a top face and a side wall between the top and bottom faces. The top face provides a circular depression with a central protrusion extending upwardly from the circular depression and terminating with a top surface above the top face of the square block. The circular depression provides an annular radius and an outwardly divergent side surface. The molded product is formed within the circular depression between the central protrusion and the side surface and is preferably made of concrete or similar material.
Abstract:
A method of operating a mold assembly having a plurality of liner plates forming a mold cavity. The method includes driving a master drive element back and forth in a continuous loop about at least a portion of exterior perimeter sides of the mold cavity to provide a first and second linear forces in first and second directions substantially in parallel with each perimeter side of the mold cavity about which the primary drive element is routed, and driving a secondary drive element, which engages the at least one moveable liner plate, with the first and second linear forces to drive at least one moveable liner plate toward and away from the interior of the mold cavity.
Abstract:
There is provided a process for producing pylon segment precast concrete parts of a pylon of a wind power installation. A formwork is provided and the formwork is filled with concrete. A material of low viscosity is applied as an equalization layer to a flange of the precast concrete part.
Abstract:
The present invention relates to a method for tightening a bolt connection through elongation of the bolt where strokes of a power element, especially a hydraulic cylinder, are converted into a rotational movement of a tightening tool. The method according to an embodiment of the present invention is carried out in at least two steps. As a first step, the bolt is first tightened to a predetermined snug torque. As a second step, the bolt is then tightened up through a predetermined number of complete strokes of the power element of the power wrench. In this way, a torque method is combined with a rotational angle method that is controlled by the number of strokes.
Abstract:
A method of operating a mold assembly having a plurality of liner plates forming a mold cavity. The method includes driving a master drive element back and forth in a continuous loop about at least a portion of exterior perimeter sides of the mold cavity to provide a first and second linear forces in first and second directions substantially in parallel with each perimeter side of the mold cavity about which the primary drive element is routed, and driving a secondary drive element, which engages the at least one moveable liner plate, with the first and second linear forces to drive at least one moveable liner plate toward and away from the interior of the mold cavity.
Abstract:
There is provided a process for producing precast concrete parts, in particular pylon segments. Concrete is poured into a casting mold with a planar bottom for producing a planar underside. After the concrete has reached at least a minimum strength an equalization layer is applied to a join surface of the precast concrete part that is opposite to the underside. As soon as the equalization layer has reached the minimum strength, the precast concrete part is placed on a horizontally oriented surface and the equalization layer on the top side is removed in a plane-parallel relationship with the underside.
Abstract:
A mold assembly for manufacturing dry-cast concrete blocks in an automated dry-cast block machine, the mold assembly a plurality of liner plates forming at least one mold cavity, each liner plate corresponding to a perimeter side of the mold cavity, wherein at least one of the liner plates is moveable toward and away from an interior of the mold cavity. A master drive element is routed about at least a portion of the perimeter sides of the mold cavity, including the perimeter side corresponding to the at least one moveable liner plate, and forming a continuous loop, wherein the master drive element is configured to be driven back and forth about the loop to provide a first linear force in a first direction and a second linear force in a second direction opposite the first direction substantially in parallel with each perimeter side along which the master drive element is routed. A secondary drive assembly includes a first drive element coupled to the master drive element and configured to rotate back and forth about a rotational axis which substantially normal to the perimeter side corresponding to the at least one moveable liner plate in response to the first and second linear forces, and a second drive element threadably coupled to the first drive element, wherein the second drive element is configured to move linearly back and forth along the rotational axis in response to rotation of the first drive element and to move the at least one moveable liner plate coupled thereto toward and away from the interior of the mold cavity.
Abstract:
There is provided a process for producing precast concrete parts, in particular pylon segments. Concrete is poured into a casting mold with a planar bottom for producing a planar underside. After the concrete has reached at least a minimum strength an equalization layer is applied to a join surface of the precast concrete part that is opposite to the underside. As soon as the equalization layer has reached the minimum strength, the precast concrete part is placed on a horizontally oriented surface and the equalization layer on the top side is removed in a plane-parallel relationship with the underside.
Abstract:
An automated feeder for concrete pipe making machines used to produce concrete pipes that have round as well as box-shaped, elliptical and other non-round shapes. The feeder has a concrete storage hopper mounted over a fixed pivot, and the hopper charges the concrete onto a belt-type conveyor the input end of which turns on the same pivot as the hopper for movement along a radial track. The discharge end of the feeder conveyor discharges the concrete into a rotatable chute that distributes the concrete into the cavity of the pipe mold. Encoders are combined with the motors driving the chute and the radial movement of the feeder conveyor so as to monitor the position and speed of the radial movement of the conveyor and position and speed of rotation of the chute. Information from the encoders is inputted into a computer which is programmed to control the speed and position of these components of the feeder depending upon the selected size and shape of the concrete form to be filled.