Abstract: A mixing drum includes a body defining a head aperture and a discharge aperture opposite the head aperture, a head coupled to the body and extending across the head aperture, and a mixing element positioned within the volume and coupled to the body. The head and the body define a volume. The body is formed from at least a first section and a second section. The first section overlaps the second section.

Abstract: A first solution is mixed and diluted with diluting liquid to make a first dilute solution, a second solution is mixed and diluted with diluting liquid to make a second dilute solution, and the first dilute solution and second dilute solution, both diluted with diluting liquid, are mixed in a sealed tank.

Abstract: A method and pneumatic spreading machine control/regulate a metering element. A transfer chamber downstream of the metering element transfers metered material to a conveying line for spreading. A blower charges the conveying line with an air stream. Spreading elements are downstream of the conveying line. Calibration includes actuating metering elements, charged with a particular type and of material, over a predetermined test duration with a predetermined operating parameter. A mass of material metered during calibration is gravimetrically detected downstream of the metering element and upstream of the transfer chamber or in the transfer chamber, following which the material is transferred to the conveying line and dispensed. A functional relationship between the operating parameter of the dosing element and the actual mass flow of material for spreading, metered by means of the metering element, is calculated.

Abstract: An onboard washing system provides the ability to wash specific areas at the rear of a concrete truck, without requiring an operator to climb a ladder or climb on the truck. Certain specified areas which are traditionally difficult to wash, including the inside of the charge hopper, the interior portions of the discharge chute, and rear portions of the mixing drum structure, can now be washed in an automated and efficient manner. The truck-mounted washing system has components which are specifically positioned to cause washing fluid (water) to be sprayed or directed toward predetermined areas in an efficient and effective manner. The system also includes hand-held washing wands or washing mechanisms, which allow an operator to easily reach additional zones or additional areas at the rear of the truck, which are lower. Most significantly, the truck-mounted wash systems and the hand-held nozzle systems (wand) are all operable while an operator remains on the ground.

Abstract: A method for manufacturing an encapsulating material sheet for a solar battery of the invention includes a step of producing an additive-containing pellet by soaking an additive A into a pellet including a polyolefin-based resin as a main component, a step of injecting the additive-containing pellet into a cylinder from a supply opening in an extrusion molder, and melting and kneading a resin composition including the polyolefin-based resin and the additive A in the cylinder, and a step of molding by extrusion the resin composition from a die in the extrusion molder into a sheet shape.

Abstract: Method and system for motoring and obtaining information about quantity and characteristics of cementitious material In a rotating mixing drum. The present invention involves analysis of a sequence of values corresponding to a waveform reflecting the hydraulic pressure required to turn a concrete mixing drum at successive instances during rotation. Preferred embodiments involve the conversion of this time-domain data into the frequency-domain. Behavior of multiple harmonics can be examined in real time and further information obtained regarding physical properties of the concrete. Rheology or other properties can be adjusted by introducing a liquid into the concrete, based on a comparison between time-domain and/or frequency-domain values derived from a sample concrete in the drum and previously stored time-domain and/or frequency-domain values, which are preferably correlated with physical characteristics of concrete, such as slump, slump flow, load weight, and other factors.

Abstract: An on-board auxiliary tank system for supplying makeup water and chemical additives to a transit concrete mixing vehicle is disclosed. The system includes a water tank having a sloped, generally concave upper section, spaced sides and a bottom designed for deployment nested beneath a mixing drum of a transit concrete mixing vehicle and defining a water compartment and a pair of elongate support block members for supporting the water tank situated beneath the sides of the tank and adapted to be attached thereto by removable latch fasteners. The block members include elements suitable for fastening the blocks to a concrete mixing vehicle.

Abstract: A transportable concrete mixing plant is provided and includes a frame, a mixing drum for mixing concrete, a conveying system having at least one rail for moving a pre-measured quantity of premix concrete to the mixing drum, and a supply hopper for directing the pre-measured premix concrete into the mixing drum. The rail forms a support track that is traversed by the supply hopper, which travels from a dispensing position near the mixing drum to a loading position spaced from the mixing drum. Optionally, a concrete pump dispenses flowable concrete received from the mixing drum and pumps it to a remote location, such as a work site.

Abstract: A process for making concrete includes treating water with ions and/or ozone to form treated water, and mixing the treated water with aggregate and cement. A system for making concrete includes means for treating charging water with ions, ozone and/or charged particles to form treated water, and means for mixing the treated water with aggregate and cement.

Abstract: A concrete mixer truck includes: a driving device that drives a mixer drum to rotate; a pressure sensor that detects a pressure of the working fluid in the driving device; a material introduction determination unit that determines whether or not a material for generating the mixed concrete has been introduced into the mixer drum; a pressure determination unit that determines whether or not the pressure of the working fluid detected by the pressure sensor has fallen to a set pressure set in advance in accordance with a carrying amount and a fluidity of the mixed concrete after the introduction of the materials for the mixed concrete into the mixer drum; and a notification device that notifies an operator that the pressure of the working fluid in the driving device has fallen to the set pressure on the basis of the determination made by the pressure determination unit.

Abstract: A warm mix asphalt plant comprising a counter-flow drum, apparatus for precisely metering flows of A/C and water, an asphalt expander with no moving internal parts where a circular curtain of flowing clean water is mixed with a coaxial circular curtain of moving heated A/C to create asphalt foam which is heated and mixed inside a lower portion of the asphalt expander and then distributed to cover aggregate inside the counter-flow drum.

Abstract: An apparatus and method to measure and control the slump of concrete by monitoring sensor within the interior surface of a concrete mixer and a liquid flow meter. Data is analyzed by a computer processing unit to determine the slump of the concrete, liquid needed the quantity of concrete within the mixer, the amount of concrete poured, and the starting and ending time of the pour.

Abstract: A mixing and delivery machine for flowable materials having on-site and towable mobility for mixing, hydrating, and delivering an admixture such as cementious mix, concrete, binder, graveled sand, mold sand and various other mixtures via an extended auger and elevatable hopper is used to facilitate both loading and releasing the hopper contents into the feed end of the auger. The auger is driven by a primemover and a wheel set on the machine facilitates the raising and lowering of the delivery end of the mixing auger.

Abstract: An on-board auxiliary tank system for supplying makeup water and chemical additives to a transit concrete mixing vehicle is disclosed. The system includes a water tank having a sloped, generally concave upper section, spaced sides and a bottom designed for deployment nested beneath a mixing drum of a transit concrete mixing vehicle and defining a water compartment and a pair of elongate support block members for supporting the water tank situated beneath the sides of the tank and adapted to be attached thereto by removable latch fasteners. The block members include elements suitable for fastening the blocks to a concrete mixing vehicle.

Abstract: An embodiment of a water control apparatus is disclosed that may be used with a concrete mixing assembly. The apparatus may include flowmeter unit and a normally closed valve unit. The normally closed valve unit may be in fluid communication with, and removably connected to, the flowmeter unit. A control unit may be provide that may monitor the flowmeter unit and electronically control the opening and close of the normally closed valve unit. A switch may be also provided that may electrically communicate with the control unit. The activation of the switch being operable to cause the normally closed valve to open and result in the flow of water into a concrete mixing drum that is in fluid communication with the normally closed valve.

Abstract: A system for transferring coloring agents for concrete to a ready mix truck or the like, includes a tank for receiving coloring agents. The tank includes lines for supplying it with water and a pump for transferring the coloring agents to the ready mix truck through a discharge line.

Abstract: An Advanced Maritime Emissions Control System (AMECS) includes several Exhaust Intake Bonnets (EIBs) of different size and/or shape, an Emissions Capture System (ECS), and an Advanced Maritime Emissions Control Unit (AMECU) mounted on an Unpowered Seagoing Barge (USB). The EIB includes a cage formed by downward curved ribs, a shroud which is lowerable to cover the ribs, a belt near a lower edge of the EIB for retaining and sealing the EIB to a stack, and a mechanism for tightening the lower edge of the EIB (and thus the belt) around the stack. The ECS lifts one of the several EIBs onto the stack of an Ocean Going Vessel (OGV). Exhaust from the stack is drawn through a large diameter duct to the AMECU. The AMECU processes the exhaust through multiple treatment stages. The stages include pre conditioning the exhaust, oxidizing, reducing, polishing, and precipitating.

Abstract: A process and equipment for producing multi-color concrete products, including architectural concrete blocks, concrete bricks, modular concrete products that are suitable for use in landscaping applications, such as retaining wall blocks, concrete pavers, and concrete slabs. The invention includes a spray mechanism that sprays liquid pigment onto concrete discharged from a hopper. The concrete then proceeds to a blending mechanism which blends the pigment into the concrete to produce a multi-color concrete blend. The concrete blend is then used to produce multi-colored concrete products.

Abstract: A volumetric solid and liquid dispenser includes a drum sized for receiving and containing a predetermined volume of solid material from a solid material supply source. The supply source can be a hopper positioned above the drum. The drum is rotatably mounted to a support frame and can be rotated from a position in which it receives solid material from the supply source to a dispensing position in which it dispenses the solid material into a receptacle below. A liquid metering and dispensing container dispenses a predetermined volume of liquid into the receptacle for mixing with the solid material. The invention is particularly useful for dispensing predetermined volumes of sand and water into a cement mixer for mixing with mortar.

Abstract: A system and method for reducing the emissions from a dust generation station, such as a metal cutting station, can be easily transported from location to location. The system uses a mobile carrier which supports a separator, such as a baghouse, as well as a telescopically adjustable duct. A hood, which is attached to the duct and serves to contain exhaust gases generated at the dust generating station, is capable of rotation about the hood pivot point. An exhaust fan serves to induce flow of the exhaust gas from the hood, through the duct and across the separator. A mobile, emission-free metal cutting system incorporates the system for reducing emissions as well as a mobile transport cutting machine.

Abstract: A bag house is mounted on a portable trailer and has a tube sheet with depending filter bags in part defining a first plenum for receiving a gas stream with fines and a second plenum for receiving clean gas from the filter bags. The fines are collected in one or more hoppers below the filter bags. A screw conveyor in each hopper has reverse flighting adjacent opposite ends for conveying separated fines longitudinally along and from adjacent opposite ends toward a central location intermediate the length of the housing. An elevation conveyor having an inlet located in the central location conveys the collected separated fines out of the housing to an external outlet for discharge into a surge operator.

Abstract: A continuous preparation of calcium hydroxide slurry can be made on a mobile apparatus that uses an eductor to initially combine metered flows of calcium oxide and water. The calcium hydroxide slurry is retained in a deaerating sump and then pumped into a serpentine centrifugal mixer so that the reaction of the calcium oxide and the water is safely complete. Because the apparatus allows the calcium hydroxide slurry to be recirculated into the deaerating sump, the slaking process can continue even when it is necessary to pause the discharge of slurry to change transport tankers.

Abstract: The invention relates to a method and a device for providing at construction sites paste-like building materials, especially mortar, being delivered in a fixedly pre-determined basic consistency. A conveying and mixing pump with an additional water supply opening is provided below the storage container for the paste-like building material. By means of the water supply opening, additional water is mixed with the mortar in order to produce the desired mortar consistency. For this purpose, a mixing portion having hedgehog-type mixing elements is provided.

Abstract: A progressing cavity pump adapted for use in pumping liquid/solid mixtures with a solid content of about 50% has a single start helical rotor and a two start helical stator bore. The ratio of the eccentricity of the rotor to its minor diameter is about 1:4.9. The ratio of the eccentricity of the rotor to the stator lead is about 1:13.3. The pump may be truck mounted and used for pumping explosives.

Abstract: A cooling apparatus for used foundry sand provided with a homogenizing and conveying apparatus in a constant vacuum with controlled water inflow and a suction point for the water vapor, the water evaporating due to the reduced pressure draws the heat of evaporation from the sand, the apparatus having a condenser in which the vapor condenses into water which is cooled and re-used, and coupled locks provided on the inlet and outlet of the conveying apparatus, through which the sand enters and leaves the reduced pressure area.

Abstract: An apparatus for high capacity production of high-fluidity, colloidally mixed cement slurry. Water and cement dust are combined at metered rates by a premixing assembly which discharges into a mixing tub. The high-speed, high-shear pump recirculates the material through the tub to produce the colloidally-mixed slurry. The high-fluidity slurry may be provided to a second pump, preferably of the positive-displacement, progressive-cavity, rotor-stator type, for supplying the slurry at a metered rate. Finished foam material may also be provided to the slurry metering pump at the metered rate, so the materials are mixed to form a foamed cement grout in which the weight and quality of the material is precisely adjustable.

Abstract: A self-cleaning mixer includes a cylindrical housing and a feedscrew extending longitudinally through the housing for mixing water and cement and conveying the slurry through the housing. A chute at the infeed end of the housing receives a batch of material and directs the material into the housing. The feedscrew turns on a hollow shaft including a plurality of outwardly directed nozzles along a portion of the length of the shaft. The housing includes a plurality of inwardly directed nozzles fed from a pair of manifolds. During a cleaning cycle, one of the manifolds is shut off, thereby increasing the water pressure in the other manifold and increasing the force of the spray to enhance cleaning. The housing is slightly inclined to provide gravity feed of slurry in addition to the feedscrew.

Abstract: An apparatus for controlling the flow of water to a pug mill. A water supply system is connected to the pug mill for providing a flow of water to the pug mill. The water supply system includes an inlet line connected to a supply of water; a pump connected to the inlet line; an outlet line connected between the pump and the pug mill; a return loop connected between the outlet line and the inlet line; and bypass means for selectively controlling the flow of water between the pug mill and the return loop. The invention also includes a control system having a moisture sensor for providing a signal representative of the moisture level of the clay feed material. A flow transmitter is located between the water supply and the pug mill for providing a signal representative of the water flow to the pug mill. A control valve is located between the water supply and the pug mill for controlling the flow of water to the pug mill.

Abstract: A small batch mixer particularly suited for preparing small quantities of mixture blends dry powdered material with an aggregate and a liquid. The ingredients may be cement, sand, and water. The batch mixer has two screw augers. The first auger feeds dry mix into an elongated mixing chamber of constant diameter. The second auger mixes the dry and liquid mix constituents, and conducts blended mixture to a discharge port located at the end of the elongated mixing chamber. The blade of the second auger is formed in three sections. In respective order, these sections include a first section wherein the blade is configured as a screw auger; a second section wherein the blade has intermittent gaps, thereby forming paddles pitched to urge the mixture onward to the third section; and a third section which, like the first section, includes a blade configured as a screw auger. The liquid is metered by a valve controlled in accordance with the feed rate of the solid constituents.

Abstract: A method of forming a mixture of powdered material and water includes the step of providing a hopper, a holding tank, a tube intermediate the hopper and the holding tank, and an air-powered auger arranged to feed powdered material from the hopper through the tube to the holding tank. The method proceeds by adding powdered material to the hopper, supplying water to the tube, and operating the auger to feed the powdered material into the tube, to mix it with water in the tube, and then to push the mixture out of the tube to the holding tank. For drywall texturing applications, the mixture may then be delivered from the holding tank under pressure to a spray nozzle. An apparatus for forming a mixture of powdered material and water includes a hopper, a holding tank, a tube intermediate the hopper and the holding tank, and an auger extending from the hopper into the tube.

Abstract: In a mixing drum (16) of a vehicle mixer is supported a coaxial pipe (24) which together with a closure element (36) and a feeding hopper (42) forms a constructional unit. The pipe (24) is supported by two bearings of the mixing drum (16) so as to be relatively rotatable and longitudinally displaceable. The closure element (36) serves for closing a tail opening (20) of the drum (16) and can be adjusted axially with the central pipe (24) by means of an adjusting device in order to open or close the tail opening (20) of the drum. The pipe (24) extends nearly over the entire length of the mixing drum and ensures the vibration-free bearing of the closure element so that between it and the drum mouth during driving, no relative shifts can occur which would damage the drum mouth sealing. The constructional unit can be pulled as a unit from the mixing drum so that maintenance work can readily be carried out.

Abstract: A portable continual mixer blends dry powdered material with an aggregate and a liquid. The ingredients may be cement, sand, and water. The batch mixer has two screw augers. The first auger feeds dry mix into an elongated mixing chamber, and has its own electric motor and speed control. The second auger mixes the dry and liquid mix constituents, and conducts blended mixture to a discharge port located at the end of the elongated mixing chamber. The blade of the second auger is formed in three sections. In respective order, these sections include a first section wherein the blade is configured as a screw auger; a second section wherein the blade has paddles pitched to urge the mixture onward to the third section; and a third section which, like the first section, includes a blade configured as a screw auger. The liquid is metered by a valve controlled in accordance with the feed rate of the solid constituents. A predetermined proportion of dry and liquid constituents is thus maintained.

Abstract: This invention concerns a device for continuously injecting liquid additives into a fluid.The device includes a jet eductors system for prediluting the additives.Applications in the oil and related industries, the building industry and similar. FIG.

Abstract: Improved paddle mixer, including a stationary drum solid to a support frame, with a vertical shaft engaged with a motor-reducer unit and provided with a plurality of transverse arms to each of which at least a paddle is fixedly or otherwise rotatively connected, wherein each of the paddles, being fixed with respect to the relevant support arms, is made up of two like plates disposed at the free end of the corresponding arm and between which a rubber element is interposed so that, by the rotation of the shaft, that is, during the blending of the materials introduced inside the drum, the rubber element provides for scraping the side or respectively bottom wall of the drum.

Abstract: An asphalt production plant with a drum dryer having two burners and expanded exhaust gas exit area. The dryer has a rotatable dryer drum with an inlet end and a discharge end. A burner is positioned at each end of the dryer drum to produce a stream of hot gases both parallel with and counter to the movement of aggregate through the dryer drum. A dust chamber surrounds a medial dust section of the dryer drum. The dust section of the dryer drum communicates with the dust chamber through slots and perforated angle plates to produce an increased area for the exit of exhaust gases. In addition to the drum dryer, the plant comprises an aggregate feed system for delivering aggregate into the dryer, an exhaust system, a drum mixer, a recycle feed system, a reservoir of bituminous fluid and an asphalt bin. A drag conveyor is provided to transfer aggregate from the dryer into the drum mixer. Recycle material and dust from the exhaust system may be introduced into the drag conveyor as well.

Abstract: A process using an improved apparatus for mixing and cooling molding sand.

Abstract: A separation and reclamation apparatus for separating a first discrete-phase solids material from a fluid mixture including, in addition, a second discrete-phase solids material and a continuous-phase carrier fluid, has a unitary vessel having a discharge tank connected to a receiving tank and in fluid communication therewith through an opening on the bottom side wall of the receiving tank. The receiving tank both mixes and transports the mixture. A controller actuates a door over the opening for transport of the first discrete-phase solids material out of the receiving tank into the discharge tank via a conveyor having an open discharge end higher than the top of the receiving tank. The apparatus includes a pump arranged to intake material from the discharge tank from contents remaining in the vessel after removal of the first discrete-phase solids.

Abstract: A food waste mixing and heat treating vehicle used in feeding hogs has a wheeled chassis. A mixing drum is rotatably mounted on the chassis having an inner wall forming a mixing and heating cavity and having an opening into the cavity. Means are provided for rotating the mixing drum. Two opposing helical mixing blades are each affixed along the inner wall from the opening into the cavity for drawing the food waste into the cavity from the opening, mixing the food waste in the cavity and evacuating the food waste out of the cavity through the opening. Steam injecting means are along the inner wall within the cavity for injecting steam through the food waste for heat treating the food waste for later feeding hogs after the food waste has cooled. The method involves the collecting, heat treating and feeding of the food waste to hogs with the vehicle. The hog lot for raising and feeding hogs the heat treated food waste comprises a plurality of adjacent elongate pens with a juxtaposed feed pen there along.

Abstract: The apparatus allows mixing of a solid and a fluid continuously to facilitate downhole operations, especially gravel packing. The apparatus comprises a solids hopper, with preferably an internal auger, to meter the solids flowrate. The solids drop into a second feeder which empties into a mixing chamber. Liquid can be directed into an annular space formed in the mixing chamber around the periphery of the second auger, or could be piped into the second auger itself. A triplex pump is connected to the mixing chamber and draws the mixed solid and fluid and pumps it to sufficient pressures for use in a wellbore.

Abstract: A portable system for on-site batch mixing of cementitious materials, such as mortar and grout, includes a batch mixing machine for metering and mixing cement, sand and water, a cement storage silo sized to hold at least one commercial delivery truckload of cement, and a pair of sand supporting ground pads. The large cement storage silo significantly reduces the manpower and equipment costs associated with the overall batch mixing process, and the sand support pads operate to prevent dirt contamination of the cementitious mixture. The water storage portion is provided with a simplified, floatless fill level control system and an improved water heating system which significantly reduces water temperature stratification. A specially designed pressurized shaft bearing/seal structure provided on the batch mixer portion of the mixing machine reduces grease and seal maintenance and functions to essentially preclude entry of cementitious material into the shaft bearing.

Abstract: The present invention relates to a method and a system for recycling wash residue of ready mixed concrete include the steps of condensing used cement sludge to a predetermined concentration, storing the condensed sludge, sampling the stored sludge and determining the unhydration ratio of cement contained in the sludge, and weighing the stored sludge based on the determined unhydration ratio of cement in order to prepare a new batch of ready mixed concrete or mortar.By determining the unhydration ratio of cement contained in the sludge which has been condensed to a predetermined concentration, it becomes possible to accurately know the ratio of cement contributing as cement and its ratio contributing as the aggregate in a new batch of ready mixed concrete. A new batch of ready mixed concrete can be prepared by weighing the amount of the sludge on the basis of the determined unhydration ratio. The ready mixed concrete thus prepared will have a desired hardening strength and drying shrinkage.

Abstract: A water metering system for a concrete mixing truck includes a secure pulsing type cold water meter connected to meter water applied to the mixing drum of the truck. The meter pulses an electrically resettable counter mounted in a secure housing in the cab of the truck. The counter is reset by a key switch mounted in the housing. A manually resettable counter may be mounted to the rear of the truck, to be energized by the meter pulses.

Abstract: An apparatus and a process for mixing water from a pressurized source and an additive or admixture for a cementitious composition in a mixing chamber comprising introducing, in the form of a jet, water under a first pressure, which is above atmospheric pressure, and introducing the additive under a second pressure between atmospheric pressure and the first pressure, the amount of the additive that is introduced to the mixing chamber being controlled by means regulated by the pressure of water.

Abstract: In a dryer apparatus including an elongated rotatable drum having an input end and an output end, a burner for directing hot gases into the input end of the drum, and an aggregate feed mechanism for supplying aggregate particles into the drum adjacent the input end and for conveying the aggregate particles toward the output end, an assembly adapted to introduce reclaimed asphalt pavement particles into the dryer includes an inner drum for introducing reclaimed asphalt pavement particles into the elongated drum at a position adjacent the output end of the elongated drum and for moving the recycled asphalt pavement particles within the elongated drum in a direction counter to the direction of flow of the hot gases so that the hot gases heat the recycled asphalt pavement particles during travel of the recycled asphalt pavement particles within the inner drum assembly.

Abstract: Process and apparatus are provided to distribute specified, premixed quantities of dry mortar mix and cement to a construction site. Bulk bags and a hopper apparatus are transported to the construction site and utilized with a forklift and a mixer device. The hopper apparatus is adjustably assembled and is constructed and arranged to be hand operable to efficiently meter homogeneous predetermined quantities of the mixture out of a discharge chute. The premixed contents in the bulk bags are dumped into the hopper apparatus and discharged in metered quantities into the mixer device. A water dispensing structure is provided to discharge a predetermined volume into the mixer device to form mortar or concrete for use.

Abstract: A drum mixer is provided for producing an asphaltic composition. The drum mixer utilizes a first heat source located at an intermediate position within the drum mixer for producing a first current of hot gases directed towards the entry end of the drum mixer. The drum mixer also utilizes a second heat source located at the discharge end of the drum mixer for producing a second current of hot gases directed towards the entry end. Virgin aggregate is introduced into the drum mixer at the entry end of the drum mixer and is heated by the first current of hot gases. Recycle material is introduced into a mixing zone within the drum mixer between the first heat source and the discharge end. The heated virgin aggregate combines with the recycle material in the mixing zone and is further heated by the second heat source. Liquid asphalt is mixed with the virgin aggregate and recycle material in the mixing zone and the product is removed from the drum mixer at the discharge end.

Abstract: A novel process and apparatus for discharging, on a batch basis, cement and water as a slurry or in the form of separate discharges of slurry and cement, where the materials so discharged contain a predetermined amount of water and a predetermined amount of cement, is disclosed. A major quantity of water and all or a major quantity of the cement is mixed in a slurry mixer to produce a primary slurry. A major portion of the primary slurry is then discharged, and the remaining slurry mixed with the remaining quantity of water for discharge as a second slurry. A minor portion of the cement can optionally be added to a dry chamber for discharge therefrom. The slurry mixer and dry chamber, which are substantially closed systems, can be vented together, and then vented to atmosphere, so that air in the slurry mixer which is displaced during water and cement charging flows through the dry chamber.

Abstract: A mixer (10) consisting of a stationary casing (9), into which the outlet end (2b) of a rotary drum (2) opens, and mixing vanes fixed to the casing of the drum (2) and extending this casing axially in the direction of its outlet (2b). A burner (13) having an elongate body (12) projects into the drum (2) at its outlet end (2b) and opens into a flame zone (22). A recycling ring (32) is arranged around the drum (2) in the vicinity of the end (12a) of a burner. The casing (9) of the mixer delimits a mixing zone (36), separate from the flame zone (22), around the body (12) of the burner.

Abstract: A burner (13) and a conveyor (6) for aggregates (7) into the drum (2) penetrate into the drum at opposite ends (2a, 2b). Circulation of the gases inside the drum occurs in direction opposite to circulation of the aggregates. The burner has an elongated body (12) arranged in the axial direction of the drum. The drum comprises, from the inlet end (2a) to the outlet end (2b), a drying zone (21), a flame zone (22), a zone for introducing recycled mixes (23') and a heating and mixing zone (23). The device may be associated with a mixer (42) of the conventional type in which the bituminous products (11) leaving the drum (2) are mixed with liquid bitumen and worked. The invention enables coated products for road surfaces to be prepared without the production of bitumen vapor.

Abstract: A drum mixer having an countercurrent flow drying zone and a parallel flow mixing zone is provided for producing an asphaltic composition. The drum mixer utilizes a heat source located at an intermediate position therein for generating three streams of hot gases. The first stream of hot gases is directed towards the receiving end of the drum mixer in a countercurrent direction to the flow virgin aggregate entering the drying zone of the drum mixer. Recycle material is introduced into the drum mixer between the heat source and the discharge end thereof. The recycle material and the heated virgin aggregate are combined within the mixing zone. As both materials travel towards the discharge end of the drum mixer the second stream of hot gases is directed towards the discharge end of the drum mixer in a parallel direction to the flow of the mixing materials for heating said materials.