A concrete mixer vehicle includes a mixer drum, an additive admixture system, and a controller. The additive admixture system includes an air inlet valve, a fluid valve, an air valve, and a pump. The controller is configured to operate the additive admixture system to transition the additive admixture system between an additive addition mode, a drain mode, and a system clear mode. The controller transitions the additive admixture system into the additive addition mode and operates the pump until a desired amount of an additive is added to the mixer drum, transitions the additive admixture system into the drain mode for a predetermined amount of time in response to the desired amount of additive being added to the mixer drum, and transitions the additive admixture system into the system clear mode for a predetermined amount of time to clear stagnant fluid or built up mixture from the additive admixture system.

The present invention provides methods and devices for secure computing device start up. The method includes generating a public/private key pair and signing a software image and obtaining a first time stamp and a second time stamp. The method further includes combining the signed software image, the first time stamp and the second time stamp into a bundle and deploying the bundle. During secure start up, the method includes authenticating the signed software image, the first time stamp and the second time stamp and booting the computing device if authentication passes. The computing device aborts booting the computing device if the authentication process fails.

The disclosure provides a measurement set-up for a return cement suspension, a construction site arrangement with a measurement set-up, and a method which can be carried out inexpensively, reliably, and easily.

A liquid additive mixing apparatus is provided that has a plurality of chambers containing additives, as well as a system for mixing the additives. One or more additives are mixed with water to form a mixing fluid. The mixing fluid is placed in a first tank that is fluidly connected to a cement mixing unit. A cementing operation is executed during which the mixing fluid from the first tank is mixed with a cement to form a slurry. A capillary electrophoresis (CE) instrument is employed to monitor at least one additive parameter and detect deviations from a predetermined tolerance for the at least one additive parameter.

The invention relates to an apparatus (110) for producing foamed building materials, comprising a gas supply unit (112), a suspension supply unit (150-156), and a mixing chamber (118), the apparatus (110) further comprising a control and/or regulating unit (136) which has means (116, 124, 130, 134, 146,) for supplying values of a plurality of input parameters, based on which at least a temperature of the dispersion and an air pressure in an environment of the apparatus (110) can be inferred, the control and/or regulating unit (136) being further configured to influence at least one output parameter, by means of which the ratio of the volumes and/or masses and/or densities of gas and suspension supplied per unit of time can be adjusted. The invention further relates to a corresponding method.

This disclosure describes volumetric mobile powder mixer (VMPM) systems and methods for VMPM operation and use. The VMPM is providing with a number of storage compartments (or bins) for liquid or solid ingredients including at least one powder storage bin, a powder transport system, a dust handling system, a solid/liquid mixing system, a cellular foam generator, a product delivery system, and a controller capable of monitoring the delivery and mixing of each of the ingredients, as well as the discharge of the final product. The controller determines if the proper mixture is being discharged by the VMPM and, if not, alerts the VMPM operator. In an automated embodiment, the VMPM controller is also configured to independently control the delivery and mixing of each of the ingredients, as well as the delivery of the final product.

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.

A printhead for an additive manufacturing system includes a hopper, an outlet, a mixing shaft, and a drive shaft. The hopper includes an inner volume configured to store a slurry material for mixing. The outlet includes a passageway fluidly coupled with the hopper. The outlet includes an open end for discharging the slurry material to a surface through the passageway. The mixing shaft extends through the inner volume of the hopper and includes a member that extends radially outwards from the mixing shaft. The member is configured to mix the slurry material within the hopper as the mixing shaft rotates. The drive shaft extends through the inner volume of the hopper and at least partially into the passageway of the outlet. The drive shaft includes a sloped surface configured to drive the slurry material from the hopper to the surface through the passageway of the outlet.

The invention relates to an apparatus, system, and method for the bulk blending of dry component materials to produce a blended product mix. The apparatus utilizes a special construction that allows multiple bulk dry materials to be added simultaneously to create a blended mix compliant with a desired or specified mixture of cement components. The system is automated by use of a controller, and provides real-time data to a user as to rates and amounts of materials blended and delivered over time.

The invention provides methods and compositions for treating wash water from concrete production with carbon dioxide. The treated wash water can be reused as mix water in fresh batches of concrete.