In accordance with one embodiment, a method is provided that includes providing a liquid nitrogen storage system configured to cool a supply of liquid nitrogen to a temperature below the vapor point of liquid nitrogen; coupling a piping system with the liquid nitrogen storage system to convey a portion of the supply of liquid nitrogen from the liquid nitrogen storage system; coupling the piping system with a liquid nitrogen control valve configured to control a flow of liquid nitrogen to at least one liquid nitrogen dispensing head; disposing the at least one liquid nitrogen dispensing head above a conveyance device operable to convey an aggregate stream of a concrete batching plant during use; and disposing the at least one liquid nitrogen dispensing head in a position to dispense an output flow of liquid nitrogen onto the aggregate stream of the concrete batching plant during use.

The present invention relates to a static mixer for mixing together at least two components. The static mixer comprises a mixer housing; a mixing element having an upstream end with at least two entry openings and a downstream end, the mixing element being arranged at least partly within the mixer housing; a mixing head having at least two inlets provided at an input side and at least two outlets provided at an output surface, wherein each of the at least two inlets is in fluid communication with one of the at least two outlets; and a separating wall disposed between the output surface and the upstream end of the mixing element for separating the components leaving the outlets. The separating wall comprises a free downstream edge which is disposed with respect to at least one of the entry openings so as to allow at least partial flows of the components separated by the separating wall to combine after exceeding the downstream edge and to jointly enter said at least one of the entry openings.

A method of preparing a concrete composition for downhole injection includes utilizing a controller to control a process including circulating process water in a process water supply loop for a predetermined period while monitoring and controlling the temperature and flow rate of the process water, circulating aqueous-based air entrainment solution in an aqueous-based air entrainment solution supply loop for the predetermined period and controlling the flow rate of the aqueous-based air entrainment solution and after the predetermined period of time in which the flow of process water and aqueous-based air entrainment solution have stabilized, simultaneously actuating valves to divert and mix the process water, the aqueous-based air entrainment solution and compressed air to produce an air-entrained foam and mixing the foam with a concrete composition to be deployed downhole.

A Mortar Delivery System is described. The Mortar Delivery System provides precise control of the delivery and application of mortar in addition to the mixing and tempering of mortar. Such control eliminates the use of a hand trowel in brick, block and stone laying applications. Sensing and control are integrated with the Mortar Delivery System to make it an important element of a robotic brick laying system. The Mortar Delivery System contains sensors to measure mortar viscosity and workability, mortar flow rate, and mortar nozzle pressure. The data from the Mortar Delivery System sensors can be used to change the rotational speed of the shear blades, change the amount of water being used for mixing or tempering, and change the delivery speed of the mortar. Such changes result in precise control of mortar that is in turn suitable for automated or semi-automated building processes.

A method and system for concrete monitoring calibration using truck-mounted mixer drum jump speed data selectively assimilated from previous deliveries. The method involves measuring energy at a first drum speed and a second drum speed. Slump is calculated using low speed energy/speed/slump curve data, or pre-stored equation wherein slump is derived as a function of slope of the line. The energy, speed, slump relationship in the provided concrete is compared to at least two pre-stored data curves across drum speed ranges of 15 0.5 RPM-6 RPM and 6 RPM-20 RPM, to ascertain whether the provided concrete matches any of the stored curve data; either activating the monitoring system for all drum speed ranges where a match is confirmed or allowing the monitoring system to calculate slump only at low drum speeds.

A mixer for synthetic quartz includes a mixing barrel (1), a power transmission system (2), a mixing system (3), and multiple material receiving receptacles (4). The power transmission system is provided above the mixing tank. The mixing system is provided inside the mixing tank. The power transmission system is used to drive the mixing system to move. An opening is arranged at each of two ends of the material receiving receptacle. The multiple material receiving receptacles (4) are arranged at a top portion of the mixing tank, and end portions of two adjacent material receiving receptacles are spaced apart from each other without contact there between. A resin experiences low flow resistance in the material receiving receptacle, and thus can fall smoothly without accumulating in the material receiving receptacle. Moreover, the material receiving receptacle can be cleaned easily.

Embodiments of a system and a method for continuously manufacturing a joint compound can be used to produce ready mix joint compound. The system includes means for continuously mixing wet and dry joint compound ingredients together and means for homogenizing multiple volumetric units of mixed joint compound to reduce variation in at least one joint compound material property (e.g., viscosity) across multiple successively produced volumetric units of mixed joint compound (relating to standard commercial packaging sizes for joint compound, such as five-gallon pails, for example) relative to the material property of the respective multiple volumetric units before passing through the means for homogenizing.

The invention relates to a construction material mixer, in particular an asphalt or concrete mixer, consisting of a container (1) having at least one driven shaft (5) to which mixing arms (6) carrying blades (12) are fastened at intervals, the blades (12) being at a distance from the inner wall of the container (1), the mixing arms (6) being divided into an inner part (11), which is connected to the shaft (5), and an outer part (13), which carries the blades (12), and both parts being connectable to each other by means of an adjustable connection device (22). The invention is based on the fact that the connection device (22) is a snap connection device. A particular embodiment and a rapid blade replacement method are described.

A bucket assembly for a construction vehicle, having a body with a bottom wall, a rear wall, a first side wall, and a second side wall defining a cavity therein, the first side wall having a discharge outlet. A metering system includes an auger moveably attached to the body along a pivot axis within the cavity. The auger has a motor end and a discharge end. A motor engages with the motor end of the auger and is configured for variable movement of the auger about the pivot axis in a first direction for metered dispensing of a construction material through the discharge outlet, and a second direction for controlled mixing of the construction material within the cavity.

The present invention is a dust abatement device that secures over a container. Powdery material, such as plaster, cement, grout or the like, is poured through the device, and mixed with water inside the container. The device has a mounting sleeve and radial manifold. The manifold forms a radial pneumatic channel with a circumferentially disbursed air intake that generates a radially uniform airflow to draw in airborne dust that would otherwise escape to the surrounding air. The manifold is connected to a vacuum with an air filter, and generates a dust shield zone above and around the device, which only extends down from the manifold a few inches. The manifold also funnels material and water into the container, and forms an inner eave that spaces material and water from the air intake, and forms a splash guard to retain upwardly projected splashes of material and water inside the container.