752results about "Liquid ingredients supply apparatus" patented technology

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.

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.

The invention provides a concrete production system which comprises a feeding device, a material distributing device, a concrete stirring device and a control device and is characterized in that the concrete stirring device comprises three stirring assemblies, the material distributing device is used for sequentially conveying materials conveyed by the feeding device to each stirring assembly, and the control device is used for controlling the material distributing device to control the stirring assemblies. The control device comprises a concrete process control terminal, a data transceiving network, a server, a remote control terminal and a monitoring device, and the monitoring device is used for detecting the working states of the feeding device and the concrete stirring device; the data transmit-receive network, the server, the remote control terminal and the monitoring device are respectively in information connection with the process control terminal. By arranging the three stirring assemblies, concrete can be stirred in a time-sharing mode, the problem that a system is shut down during discharging and cleaning of a traditional single stirring tank is solved, and the production efficiency of the concrete is greatly improved.

The invention discloses a phosphogypsum mixing plant which comprises a powder batching machine, an aggregate batching machine, a curing agent metering device, a conveying device, a mixing main machine and a finished product warehouse, the powder batching machine, the aggregate batching machine and the curing agent metering device feed materials into the first conveying device according to the mixing proportion, and accurate metering and stable conveying of all the materials can be achieved; the raw materials are conveyed into the mixing main machine to be continuously vibrated and mixed, then the finished materials are transferred into the finished product bin through the second conveying device, and in the process, the segregation of the finished products can be greatly reduced through the arranged anti-segregation mechanism. And the production efficiency is greatly improved through continuous stirring of the stirring main machine.

The invention relates to a preparation method of low-carbon magnesium phosphate cement. The low-carbon magnesium phosphate cement is prepared from the following raw materials in parts by weight: 40-50 parts of magnesium oxide, 20-30 parts of phosphate, 1-2 parts of a retarder, 6-8 parts of quartz powder, 1-3 parts of glass fibers, 0.5-1.5 parts of polypropylene fibers, 1-3 parts of steel fibers, 10-20 parts of slag powder, 5-15 parts of silica fume, 1-2 parts of nano silicon dioxide, 0.5-1.5 parts of nano aluminum oxide and 4-6 parts of an additive. According to the preparation method of the low-carbon magnesium phosphate cement, mineral admixtures or industrial waste residues which are lower in price are introduced to serve as partial substitute materials, the requirement for high-cost raw materials is reduced, waste such as fly ash and slag can be used for replacing partial expensive raw materials, the production cost is reduced, cyclic utilization of resources is promoted, and the low-carbon magnesium phosphate cement is suitable for industrial production. Secondly, in order to overcome the problem that the strength of traditional low-carbon magnesium phosphate cement is reduced in water, a special retarder, a stabilizer and other modified materials are added, and dissolution of hydration products in water can be effectively inhibited.

The invention relates to the field of flow-state solidified soil, and discloses flow-state solidified soil prepared from construction waste, preparation equipment and a preparation method. The pre-dehydration module is used for controlling the water content of discharged materials to be less than or equal to 14%; the system further comprises a main drying system, an auxiliary material adding device, a water adding device and mixing equipment. The main drying system comprises a high-temperature drying area, a high-temperature buffering area and a heat preservation discharging area which are arranged in the vertical direction, materials treated by the pre-dehydration module are lifted into the high-temperature drying area through lifting equipment, the main drying system comprises at least two sets of material conveying belts, and a plurality of hot air openings are evenly formed in the top of the high-temperature drying area; an inlet of the hot air pipe is communicated with an air cavity heated by a heat source; a recovery channel communicating with the portion, close to the bottom, of the heat preservation discharging area is arranged on one side of the main drying system, and an obliquely-arranged dust baffle is arranged in the recovery channel. According to the invention, the problems of fluctuation of construction waste sources and large change of material moisture content in the prior art are solved.

Compositions and methods are provided for a system in which liquid carbon dioxide, or a mixture of liquid and gaseous carbon dioxide, is converted to solid carbon dioxide by exiting an orifice at a sufficient pressure drop, e.g., for delivery of carbon dioxide to a concrete mixture in a mixer.

Compositions and methods are provided for a system in which liquid carbon dioxide, or a mixture of liquid and gaseous carbon dioxide, is converted to solid carbon dioxide by exiting an orifice at a sufficient pressure drop, e.g., for delivery of carbon dioxide to a concrete mixture in a mixer.

The invention discloses an integrated concrete mixing plant, which belongs to the field of concrete equipment and comprises a cement bin body, a central control room and the like which are integrated into a whole, a blanking bin is arranged at the bottom of the cement bin body; the cement slurry prefabricating and dust removing mechanism comprises a prefabricating stirrer, a dust removing water tank and an additive adding mechanism; the discharging bin conveys materials to a discharging pipe through an auger conveying mechanism, and the discharging pipe is connected with a feeding port of the prefabricated stirring machine. A cement slurry discharge port is formed in the bottom of the prefabricated stirrer and is connected to a terminal stirring device through a slurry conveying pipe; the aggregate weighing and storing device is used for storing and weighing aggregate; the material conveying belt mechanism is used for conveying the aggregate discharged by the weighing and storing mechanism into the terminal stirring device; and baffles are arranged outside the cement bin body, the aggregate weighing and storing device and the terminal stirring device for sealing. The invention has the advantages of less required auxiliary equipment, high integration degree, energy conservation, environmental protection, low manufacturing cost, low transportation cost and the like.

This invention discloses a continuous, high-efficiency, automatic dry-mixed mortar preparation equipment, relating to the field of mortar preparation technology. It includes a sand drying device and a feeding hopper. A sand particle screen is installed on one side of the sand drying device, and a screw conveyor connects the sand drying device and the sand particle screen. The dried sand enters the sand particle screen via the screw conveyor. Under the action of a first and second uniform material assembly, the mortar on the first conveyor belt consists of coarse sand, fine sand, cement, and filler laid out in sequence. Because the fine sand can fill the gaps in the coarse sand, reducing the relative movement space of the coarse sand and increasing internal friction, the cement and filler can be positioned on top of the coarse and fine sand. The dry-mixed mortar is stacked in a layered structure in a packaging bag using an anti-segregation telescopic tube, reducing stratification during bagging and transportation after mortar preparation, and reducing the mixing time between the mortar and water in the later stages.

The invention relates to the technical field of production of fused zirconia corundum bricks, in particular to a homogenizing and mixing device for fused zirconia corundum bricks, which comprises a mixing box, a hopper, a connecting piece and a mixing cylinder, a feed port and an opening are respectively formed in opposite sides of the outer wall of the mixing cylinder, and a filter screen is mounted on the opening. According to the homogenizing and mixing device for the fused zirconia corundum bricks, raw materials are stirred in all directions through a mixing barrel on a connecting piece, meanwhile, a second driving source drives a supporting frame to rotate around a connecting plate in the axial direction, the connecting piece slides in a center-edge-center reciprocating mode along a curve-shaped limiting sliding rail, and the raw materials are uniformly mixed; the stirring part circulates between the central area of the mixing cavity and the edge area of the inner wall, so that the mixing area of raw materials is increased, and stirring dead angles are avoided.

The invention provides a dry red mud argillization device and argillization method. The dry red mud argillization device comprises an argillization bin and a stirring tank A, the argillization bin is mounted on the ground through a bracket, and the bottom of the argillization bin is higher than the top surface of the stirring tank A; a discharging platform is arranged beside the argillization bin; the left side wall and the right side wall in the argillization bin are inclined planes which are inclined from outside to inside and extend downwards, the front side wall and the rear side wall in the argillization bin are vertical planes, the bottom surface of the argillization bin is a horizontal plane, a stirring groove in the front-back direction is formed in the middle of the bottom surface, and a horizontal spiral stirrer is arranged in the stirring groove; a sealing cover is arranged at the top of the stirring tank A, a stirring mechanism is arranged in the stirring tank A, and a water inlet pipe in the clockwise tangential direction is arranged on the lower portion of the side wall of the stirring tank A; an outlet of the stirring tank is connected with a sludge discharge tank; the tail end of the bottom surface of the sludge discharge tank penetrates through a sealing cover through a discharge nozzle and enters the stirring tank A; according to the invention, dry red mud can be conveniently and rapidly converted into red mud slurrying slurry, and the prepared slurrying slurry has good fluidity and fine granularity.

The invention relates to the field of concrete conveying, in particular to an environment-friendly and energy-saving long-distance transportation system for a fishpond, which comprises a concrete transfer unit, a conveying unit and a control unit, the data acquisition unit is used for acquiring concrete information and delivery pressure of the supply pump; the data analysis unit is used for determining the concrete flow state according to the flow reference value and the flow fluctuation value and determining a concrete conveying adjustment mode; the first adjusting unit is used for adjusting the conveying pressure of the supply pump according to the flow reference value and determining and selecting the opening mode of the humidifying nozzle according to the concrete flow response value; the second adjusting unit is used for determining a fluctuation adjusting mode according to the concrete flow fluctuation state; the stability of the concrete conveying process is improved, blockage in the concrete conveying process is avoided, it is guaranteed that water in the concrete conveying process effectively meets the conveying requirement, energy is saved, and meanwhile the long-distance conveying efficiency of the concrete pipeline is improved.

The invention discloses automatic pouring equipment for cement telegraph pole production and a process thereof, and relates to the field of cement product manufacturing, the automatic pouring equipment for cement telegraph pole production comprises a stirring barrel, the inner wall of the stirring barrel is fixedly connected with a cement powder barrel and a clean water barrel, and the surface of the stirring barrel is slidably connected with a rack. In the stirring process of a stirring shaft, a first friction cylinder and a second friction cylinder rotate in a reciprocating mode, an electric driving disc drives a reciprocating shaft to rotate, an ejector rod drives a first rotating roller to move front and back under the action of a wave annular groove, the first rotating roller collides with the surface of a vibration plate, and a cement powder cylinder vibrates; cement in a cement powder barrel falls into a cement tank and is fed into a stirring barrel, a second rotating roller feeds clean water in a clean water barrel into the stirring barrel through a lower water tank, stirring operation is carried out through a stirring shaft, and the effect of continuously adding raw materials in the stirring process is achieved.

The invention discloses a concrete mixing plant with a dust falling function, and relates to the technical field of concrete mixing plants, the concrete mixing plant comprises a powder conveying device, an aggregate conveying device, a mixing mechanism and two dust falling mechanisms, a powder tank conveys cement to a mixing bin through a screw feeder, and the two dust falling mechanisms are arranged in the mixing bin; the aggregate batching machine inputs aggregate into the stirring bin through the aggregate conveying mechanism, automatic batching is achieved, the stirring mechanism is provided with the double bins and the stirring bin, feeding and discharging of materials are controlled through the opening and closing unit, the stirring bin is provided with the stirring shaft, the adjustable stirring paddle and the conveying assembly, the conveying speed can be dynamically adjusted according to stirring resistance, and mixing uniformity is improved; the first dust falling mechanism collects dust in aggregate conveying through a negative pressure fan and a centrifugal dust removal device, and the second dust falling mechanism forms a water curtain in a stirring bin through an annular atomization nozzle to adsorb flying dust, so that dust pollution is effectively controlled while the concrete production efficiency of the stirring station is improved.

The utility model provides a movable concrete mixing plant. The movable concrete mixing plant comprises a concrete mixing assembly and a track flat car assembly, the concrete stirring assembly comprises a liquid material supply single piece, a powder material supply single piece, a gravel supply single piece and a stirring single piece connected with the liquid material supply single piece, the powder material supply single piece and the gravel supply single piece. The rail flat car assembly comprises a first flat car and a second flat car, the single stirring piece, the single liquid material supply piece and the single powder material supply piece are all arranged on the first flat car, and the single gravel supply piece is arranged on the second flat car. The liquid material supply single piece, the powder material supply single piece and the stirring single piece are integrated on the first flat car, and the gravel supply single piece is arranged on the second flat car, so that the whole equipment can be transported on a rail and can also enter a tunnel and other places with limited space, the space is saved, meanwhile, the carrying capacity of all materials is guaranteed, and the working efficiency is improved. And the requirement of concrete materials required for repairing time diseases of one skylight is met.

The invention relates to the technical field of concrete product production, in particular to a residual slurry circulation method and a device thereof.The method comprises the following steps that residual slurry is introduced into a treatment tank to be stirred, a defoaming agent and / or a retarder are / is added according to the foam condition of the residual slurry, and the residual slurry is diluted to the target density through water injection; the residual slurry reaching the target density is introduced into a collecting tank, and the collected residual slurry is stored for standby application; pumping the residual slurry in the collecting tank into a storage tank, continuously stirring in the storage tank, and storing the residual slurry for later use; pumping the residual slurry in the collecting tank into a weighing tank, proportionally adding sand, stone, cement, a water reducing agent and silica fume into the residual slurry, continuously stirring, weighing the residual slurry in the weighing tank, and discharging the mixed residual slurry through a discharging pump. According to the residual slurry circulation method and device, the residual slurry generated in the cement concrete pipe pile preparation process can be put into production again, and material waste can be reduced while environmental pollution is reduced.

The utility model belongs to the technical field of concrete preparation, and particularly relates to a mining concrete preparation system which comprises a feeding device, a cement feeding device, a belt conveyor, a spiral conveying mechanism and a stirring machine, the feeding device comprises a stock bin support and a plurality of stock bins, weighing sensors are arranged between the stock bins and the stock bin support, the stock bins correspond to the belt conveyor in an up-and-down mode, and the spiral conveying mechanism is connected with the stirring machine. The discharging end of the belt conveyor extends to a position above the feeding hole of the stirrer; the cement feeding device comprises a cement bin support, a cement bin, a feeding hopper, a cement feeding vertical screw conveyor and a cement feeding horizontal screw conveyor, the cement bin is arranged on the cement bin support, a weighing sensor is arranged at the lower end of the cement bin support, a screw conveying mechanism is arranged below the cement bin in a communicating mode, and a discharging port of the screw conveying mechanism is located above a feeding port of the stirring machine. Various raw materials needed by concrete are directly determined through the weighing sensor and conveyed to the stirring machine to be mixed and stirred to achieve concrete preparation, large-batch concrete preparation can be rapidly achieved, and the preparation efficiency is effectively improved.

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.

The utility model discloses a container type grouting pump station, which relates to the field of grouting equipment, and adopts the technical scheme that the container type grouting pump station comprises a container, and a high-speed vortex pulping machine, a slurry storage barrel, a hydraulic grouting pump, a control cabinet, a water pump and a hydraulic grouting pump are mounted on the inner bottom surface of the container; a pulping machine water inlet pipe provided with a ball valve A is mounted on the high-speed vortex pulping machine, and a water inlet of the pulping machine water inlet pipe is connected with the water pump through a pipeline; the container type grouting pump station has the advantages that after grouting is finished, a grouting pipe, a power cable and a water pipe are dismantled, a container cabinet door is closed, and then the container type grouting pump station can be hoisted or forked to a transport vehicle and transferred to a next grouting site; and secondly, a worker only needs to control the operation of each device through the control cabinet and does not need to run to multiple places for operation, so that time and labor are saved.

The present application relates to a concrete mortar proportioning feeding device, which belongs to the field of concrete processing, including a material storage system, a material weighing system, a material conveying system, a mixing host and a control system. The material storage system is connected to the material weighing system, and the material conveying system includes a conveyor belt group. The material storage device includes a primary material storage bin and a secondary material storage bin. The conveyor belt group connects the primary material storage bin and the secondary material storage bin, and a material heating component is abutted on the surface of the conveyor belt group. The control system is electrically connected to the material conveying system, the material weighing system, the material storage system, and the mixing host, respectively, to control the operation of each system. The present application achieves the beneficial effect of reducing the proportion of water weight of the material put into the material weighing system by setting a material heating component, thereby minimizing the influence of water content on concrete strength.

The invention discloses an environment-friendly dry-mixed mortar mixer and relates to the technical field of mixers.The environment-friendly dry-mixed mortar mixer comprises a mixer body and a mixing motor installed at the top of the mixer body, a first mixing shaft and a second mixing shaft are movably installed in the mixer body, and one end of the first mixing shaft and one end of the second mixing shaft upwards penetrate through the top wall face of the mixer body; a transmission mechanism is arranged at the top of the machine body, a motor cover is arranged on the outer side of the stirring motor, the stirring motor is located in the motor cover, the motor cover is fixedly installed at the top of the machine body, and a heat exchange mechanism is arranged in the motor cover; the heat exchange mechanism comprises a heat dissipation fan, the heat dissipation fan is fixedly installed on the top of the motor cover, an air outlet is formed between the motor cover and the heat dissipation fan, and a plurality of air inlets are formed in the outer side wall of the motor cover. According to the invention, the heat of the motor is dissipated, and meanwhile, water can be preheated after heat conversion, so that the consumption of energy required for subsequently heating the water is reduced, and the effects of environmental protection and energy conservation are achieved.

The invention discloses a movable premixed flow-state solidified soil preparation device with a uniform stirring function, and relates to the technical field of building construction equipment, and the movable premixed flow-state solidified soil preparation device comprises a movable frame, a stirrer, a vibrating screen assembly and a material taking mechanism. The fluid solidified soil preparation device can be flexibly adjusted and arranged according to changes of a construction area, preparation of the fluid solidified soil is achieved on a construction site, real-time pouring of the fluid solidified soil is achieved through the industrial hose pump directly connected with the stirrer, the flow concrete transferring procedure is reduced, investment of mechanical equipment is saved, and the construction efficiency is improved. The pouring construction efficiency of the flow-state solidified soil can be greatly improved; the stirring shaft drives the stirring blades to rotate and stir materials, and the first spiral blade and the second spiral blade stir the materials spirally, so that the materials are stirred, mixed and interactively stirred in the stirrer spirally, the materials are stirred more uniformly, and the stirring effect of the materials can be effectively improved.

The utility model relates to the technical field of constructional engineering, and discloses a constructional engineering material mixing and preparing device which comprises a base, supporting legs and a stirring bin. By arranging the base, the supporting legs, the stirring bin, the end cover, the stirring device, the discharging pipe, the feeding pipe and the water injection device, firstly, the stirring device is started, a left side transmission wheel drives a vertical rod to rotate, the vertical rod drives stirring blades and a scraping plate to rotate, then the water injection device is started, a second motor drives fan blades to rotate, and the fan blades rotate to generate suction force, so that water is extracted; water enters the water outlet pipe through the pipeline and flows into the stirring bin from the water outlet pipe, and then materials are uniformly injected into the stirring bin from the feeding pipe, so that the water and the materials are mixed, and the problems that in the prior art, water and the materials are generally and directly mixed together, in the stirring process, large blocks are easily formed and cannot be easily mixed, and the stirring efficiency is high are solved. And the practicability of the equipment is reduced.

The invention discloses a system for on-line preparation of fluid solidified soil from high-water-content muck, which comprises a dispersion stirrer, a screening and crushing all-in-one machine arranged below the dispersion stirrer, a slurry storage box arranged below the screening and crushing all-in-one machine, a stirring mechanism arranged in the slurry storage box, and a slurry supply pipe communicated with a shunt pipe of a mixer, the two ends of the flow dividing pipe communicate with mixing branch pipes correspondingly, the mixing branch pipes communicate with the middle storage tank through powder supply pipes, a first air spraying pipe communicates with the interior of the middle storage tank, and the two mixing branch pipes communicate with the mixing pipe. The screening and crushing all-in-one machine is used for discharging the slurry to the slurry storage box and conveying the crushed hard blocks to the slurry storage box. Compared with the prior art, the system has the advantages that the slag can be fluidized and refined through the dispersing stirrer and the screening and crushing all-in-one machine, the requirement for raw materials is lowered, and then the slurry storage box is used for buffering and then is matched with the mixer and the powder supply mechanism to achieve online mixing of the flow-state solidified soil.

The invention belongs to the technical field of building construction, and particularly discloses a construction device for controlling foundation differential settlement of a water-rich wide and large foundation pit, which comprises a high-speed pulping machine tank body, the top of the high-speed pulping machine tank body is fixedly connected with a speed reducer, and the top of the speed reducer is provided with a caking crushing mechanism. The caking crushing mechanism is used for crushing caked pulping materials, a motor is arranged at the top of the caking crushing mechanism, a hopper is fixedly connected to the top of the high-speed pulping machine tank and facilitates material adding, and an air pressure supplementing mechanism is arranged outside the hopper. The air pressure supplementing mechanism is used for increasing the air pressure in the high-speed pulping machine tank body. By means of the caking crushing mechanism, when pulping materials are poured into the hopper, caking can be crushed through the moving crushing plate, and therefore the materials do not need to be sieved before pulping, the number of devices is reduced while the working procedures are reduced, the pulping efficiency is improved, and meanwhile the pulping cost can be reduced.

This invention discloses a curing agent slurry preparation device, a curing agent slurry preparation method, and a fluidized solidified soil production method. In the preparation method, a weight sensor collects the weight change curve in real time during auger feeding, identifies the excess material discharge, and calculates the correction value for the next batch's shutdown advance. Water is injected and preliminary mixing is performed. The slurry is injected into the lower mixing chamber. After adjustment according to the correction value, the next batch is prepared. During the lower mixing, the torque of the second agitator is collected, a rheological curve is fitted, and the homogeneity is determined to be up to standard after the torque fluctuation rate is below a threshold and maintained for a set time, at which point the material is discharged. The upper and lower layers operate alternately in parallel cycles. The fluidized solidified soil production method of this invention includes: excavating a mud pit nearby and mixing it into mud; preparing the curing agent slurry using the above method; and pumping the slurry to the mud pit and mixing it into fluidized solidified soil. This invention employs a "two-step" process to prepare the curing agent and fluidized solidified soil in stages, avoiding long-distance transportation of the finished solidified soil and improving construction efficiency and the stability of the solidified soil quality.

The utility model discloses a kind of concrete production quantitative material injection devices, it is related to concrete production field, including support main box, the two side edges of support main box are symmetrically welded with installation side strip, the side edge of support main box is fixedly connected with control panel, the bottom surface of support main box is fixedly connected with discharge valve body, the bottom end of discharge valve body is fixedly connected with drain pipe, the bottom surface of support main box is fixedly provided with solid material bottom block, the bottom end of solid material bottom block is fixedly connected with discharge pipe, the top surface of support main box is provided with storage channel, the inboard of storage channel is horizontally clamped with sealing cover, the top surface of support main box is vertically fixedly connected with top air cylinder, the side edge of support main box is inserted with transmission pipe body, the bottom surface of support main box is provided with bottom through-hole, under adopting integrated structure makes it convenient to install control use, simultaneously in solid-liquid integrated control quantitative feeding structure lets its feeding more efficient and comprehensive.

The utility model discloses and provides a vacuum powder stirring machine which comprises a base, a stirring barrel detachably connected to the surface of the base, a barrel cover arranged at the top end of the stirring barrel, a stirring assembly rotationally connected to the barrel cover, a supporting rod fixedly connected to the surface of the base, a driving assembly rotationally connected to the top end of the supporting rod, and a water inlet formed in the top end of the barrel cover. A water inlet convergence connector is embedded in the water inlet and connected with a water inlet assembly through a pipeline, a barrel bottom is arranged in the middle of the stirring barrel, a grouting hole is formed in the middle of the barrel bottom and provided with a ball valve assembly, and a vacuumizing hole is formed in the base and connected with a vacuumizing assembly through a pipeline. The barrel bottom is arranged in the middle of the stirring barrel, the stirring barrel is divided into the upper cavity and the lower cavity, the upper portion is used for stirring, the lower portion is used for pouring and condensing, separate operation is not needed, the water inlet convergence connector is directly embedded in the barrel cover and can be directly pulled out when opened, a water pipe does not need to be detached, and operation is convenient and fast.

The present invention relates to the technical field of lightweight building material manufacturing, and provides a lightweight brick raw material mixing and stirring equipment and process, comprising: a frame, a mixing barrel and an agitator are installed on the frame, the mixing barrel is provided with a feeding mechanism, the agitator comprises a main shaft rotatably installed in the mixing barrel and a driving motor installed on the frame for driving the main shaft to rotate, the main shaft is provided with multiple groups of staggered stirring rollers, and stirring blades are provided at both ends of the stirring rollers; the present invention drives the mixed slurry to rotate along the mixing barrel by the stirring blades, so that the mixed raw materials above enter the bottom of the mixing barrel and are mixed with water or a liquid binder through the stirring blades, so that part of the aggregate and other raw materials are fully mixed to form a slurry, thereby gradually mixing the mixed raw materials with water or the liquid binder, avoiding the one-time addition of water or liquid binder that increases the difficulty of mixing and causes the aggregate and other raw materials to be separated.