EP0199884A2 - Verfahren zur Herstellung von Beton in einem beweglichen Posten - Google Patents

Verfahren zur Herstellung von Beton in einem beweglichen Posten Download PDF

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Publication number
EP0199884A2
EP0199884A2 EP85850157A EP85850157A EP0199884A2 EP 0199884 A2 EP0199884 A2 EP 0199884A2 EP 85850157 A EP85850157 A EP 85850157A EP 85850157 A EP85850157 A EP 85850157A EP 0199884 A2 EP0199884 A2 EP 0199884A2
Authority
EP
European Patent Office
Prior art keywords
water
concrete
aggregate material
superplasticizers
drum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85850157A
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English (en)
French (fr)
Other versions
EP0199884A3 (de
Inventor
Torsten Nikolaus Ljung
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0199884A2 publication Critical patent/EP0199884A2/de
Publication of EP0199884A3 publication Critical patent/EP0199884A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/02—Controlling the operation of the mixing
    • B28C7/022—Controlling the operation of the mixing by measuring the consistency or composition of the mixture, e.g. with supply of a missing component
    • B28C7/024—Controlling the operation of the mixing by measuring the consistency or composition of the mixture, e.g. with supply of a missing component by measuring properties of the mixture, e.g. moisture, electrical resistivity, density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C9/00—General arrangement or layout of plant
    • B28C9/04—General arrangement or layout of plant the plant being mobile, e.g. mounted on a carriage or a set of carriages

Definitions

  • the present invention has for its object a method of producing concrete in a mobile, automatically controlled concrete station for the production of concrete mixtures, comprising cement, ballast material and water, with or without superplasti- cizing admixtures.
  • the present invention refers to a method of producing concrete in a mobile concrete mixer at the building site in order to give the concrete a desired strength.
  • the invention also refers to the use of automatic control technique in the form of programmable computer technique to perform a fully controlled production of programmed contcrete mixtures.
  • the characterizing features of the invention are, according to claim 1, that the aggregate of gravel and sand is added by means of a telescopic sorter device comprising a plurality of collecting cells, and that a programmable amount of aggregate material is delivered from preselected cells through automatically controlled trap doors to a weighing drum, and from that drum to a mixer drum, to which a preselected amount of water is added, and that the consistency of the concrete paste in the mixer drum is determined by directly measuring in said drum the electrostatic voltage drop and the resistance between the ends of the concrete paste, and that the consistency is controlled by adding an additional amount of water, and possibly of superplasticizers by presetting in the computer a nominal value of the amount of water and one or more nominal values of the amount of superplasticizers for said voltage drop value and said resistance value, and by first adding water until the nomimal value of water is reached and after that adding superplasticizers until the nominal values of superplasticizers are reached, said latter values being negative with respect to the nominal value of water, and thereafter discharging (emptying) the
  • the control according to the invention comprises the use of fully determinable aggregate material curves, and by continuously screening sand and gravel and distributing the fractions of said aggregate material to a required number of separate collecting cells.
  • the discharge of the aggregate material through the controllable trap doors is made by summing up the weights of the separate fractions according to a definite aggregate material curve for the concrete mixture.
  • This weighing procedure is combined with a continuous indication of the moistness of the discharged aggregate material from the collecting cells and an automatic compensation of the preselected dry weights by adding to the moisture weights, the weight of water supplied with the aggregate. If an aggregate material of a certain fraction is missing in one or more of the collecting cells, the weighing procedure is stopped until said cells are filled again from the sorter device.
  • the consistency of the mixture is continuously controlled through the addition of water and superplasticizers. This can be done by meas- uning the change in power of a motor driving a mixer in the mixer drum, on the one hand for a dry mixture and on the other hand for a moist mixture, and by measuring in the mixer drum the conductivity, the electrostatic voltage drop and the resistance of the mixture.
  • the supply of water or superplasticizers is interrupted by activating magnetically operated valves for said supply by computer control.
  • the upper part of the concrete station according to Fig. 1 consists of a trailer 22, transported to and trestled close to a building site, where a transport device 23 supplies aggregate material to an intake in the roof of the trailer.
  • the lower part of Fig. 1 shows the transport device, being part of the concrete station, in differently folded stages, the fully unfolded stage being shown at the left. In the middle, the device is under folding, and at the right it is collapsed and is in a transportable state 25, resting on transport wheels. It is also shown that the transport device comprises a screw tube conveyor 24 for cement.
  • Fig. 2 shows the concrete station in a longitudinal section. At the top there is an intake 1 for aggregate material. This is received by a telescopic oscillating sorter device 2, screening the aggregate material and delivering it according to size to a plurality of collecting cells 3. Such cells, in a requisite number, are arranged behind each other transversely to the plane of the Figure, and contain aggregate of different particle size. Each cell has a trap door 4. Said doors are so situated that the aggregate material can be supplied from all trap doors to an intake opening of a weighing drum 6.
  • the concrete station is equip- p ed with a computer, controlling the different functions determining the composition of the concrete mixture.
  • the computer controls the supply of aggregate material of different particle size to the collecting cells 3.
  • Overfilling of any cell is indicated by means of a level indicator 16 at the upper edge of the cell, and causes a trap door to be opened by a valve 5 to a discharging conveyor belt 15, which is started and discharges the surplus material. If one of the cells is emptied during the delivery of aggregate material before the required amount has been taken out, the delivery from all other cells is stopped and the filling of aggregate materiel in them is continued. When the cell is again filled completely or to a predetermined level, the delivery (tapping) of aggregate material to the weighing drum 6 is started again.
  • the computer controls the opening and closing of valves, preferebly such of a pneumatic type, said valves actuating the trap doors 4 for delivering preprogrammed amounts of aggregate material from the collecting cells 3 to the weighing drum 6.
  • the moistness of the aggregate material is being continuously detected by means of moisture detectors 13, connected to the computer. It will thus be possible to determine the amount of water in the aggregate material and to let the computer correct the amount of such material supplied to the weighing drum 6.
  • Said drum is equipped with means for turning or rotating it, for instance by pneumatic means, so that the drum, as response to a signal from the computer, is brought to an emptying position, where its content is discharged in an intake opening of a mixer drum 7, having continuously driven mixer blades.
  • cement is being transported by a screw tube conveyor 10 to a cement weighing vessel 11 above the mixer drum 7.
  • the conveyor is- stopped when the. prescribed amount of cement has been transported to the cement weighing vessel 11.
  • Said vessel is equipped with a shutable conduit leading to the intake opening in the mixer drum 7.
  • a preprogrammable amount of water is supplied in a large dose to the mixer drum 7 through a conduit. This supply can be choked to a fine dose or can be stopped completely. Before that the preset amount of water has been reduced by the amount of water in the aggregate material that has been determined by the moisture detectors.
  • As a control quantity for changing the dosage of water the change of power of the motor driving the mixer blades can be used, the change quantity being supplied to the computer. The addition of water influences the consistency of the mixture.
  • a control quantity for controlling the mixing procedure can also consist of the electrical conductance of the concrete paste, said conductance being measured in a convenient way between the ends of the mixture in the mixer drum. It is also possible to measure the ZETA-potential difference between the said ends, or to perform a voltage measurement, i.e. a measurement of the ZETA-potential difference, in the drum.
  • the computer actuates the emptying of the mixer drum 7, for instance by means of a pneumatic turning device, positioning the intake opening of the drum above a receiving hopper 8, from which concrete can be emptied by manual means 9.
  • a new weighing phase may have been started, upon which the mixing procedure is automatically repaa- ted.
  • the process can be supervised at a control panel 20, situated outside the mixing zone.
  • the station can also be equipped with a device 21 for evacuating dust and whirling around cement particles to a collecting cell.
  • Fig. 3 illustrates the effect of the addition of water and superplasticizers.
  • the curve in the diagram shows the ZETA-potential change in the cement paste in the mixer drum (in millivolts along the y-axis) as a function of the weights of added superplasticizers in per cent of the weight of cement (as a decimal number along the x-axis).
  • the measurement of the ZETA-potential difference eliminates the influence of impurities in the added super- p lasitcizers and a dilution thereof.
  • the ZETA-potential difference zero is obtained.
  • a ZETA--potential difference having positive sign is obtained (downwards from zero).
  • the lowest point (about 9.8 mV) is possible to reach when the most suitable proportions of the components are chosen. (If another type of cement or other quantities of the components, especially of water, is used for the mixture, it is possible to reach another value, below 9.8 mV.)
  • the highest point of the curve may be reached (from about 9.8 mV to about -38.0 mV).
  • Two nominal values 26 and 27 are indicated on the curve.
  • the nominal value 26 is reached by the programmed control and by the addition of a large dose of superplasticizers. Switching to a fine dose of superplasticizers is suitable at 85 to 90 % of the programmed (maximal) nominal value 27 of the voltage. The supply of superplasticizers is stopped when the last-mentioned nominal value is reached.
  • the nominal value 27 is depending on the type of superplasticizers and gives a concrete mixing program resulting in the desired consistency of every mixture.
  • the curve shows that all kinds of superplasticizers give a change in sign from a positive to a negative voltage value when supplied to cement (or even to gypsum). This change in sign has a limited duration and reverts after about 45 or 60 minutes, depending on the type of superplas-- ticizers, to positive values when the hardening of the concrete starts.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
EP85850157A 1983-11-07 1985-05-03 Verfahren zur Herstellung von Beton in einem beweglichen Posten Withdrawn EP0199884A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8306098A SE443741B (sv) 1983-11-07 1983-11-07 Sett for tillverkning av betong i mobil betongstation

Publications (2)

Publication Number Publication Date
EP0199884A2 true EP0199884A2 (de) 1986-11-05
EP0199884A3 EP0199884A3 (de) 1987-01-14

Family

ID=20353204

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85850157A Withdrawn EP0199884A3 (de) 1983-11-07 1985-05-03 Verfahren zur Herstellung von Beton in einem beweglichen Posten

Country Status (3)

Country Link
EP (1) EP0199884A3 (de)
SE (1) SE443741B (de)
WO (1) WO1986006677A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1000379C2 (nl) * 1995-05-17 1996-11-19 Arwo Bv Houder voor het transporteren van een korrel- of poedervormig materiaal.
WO1997026121A1 (de) * 1996-01-18 1997-07-24 Bayosan Wachter Gmbh & Co. Kg Verfahren zur herstellung von fliess- und/oder pumpfähigen baustoffen, insbesondere fliessestrichen
GB2416134A (en) * 2004-07-13 2006-01-18 Innovation Holdings Apparatus and method for manufacturing concrete
US7386368B2 (en) 2005-06-17 2008-06-10 Icrete, Llc Methods and systems for manufacturing optimized concrete
US7581903B1 (en) 2006-06-08 2009-09-01 Thermoforte, Inc. Method of manufacture and installation flowable thermal backfills

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO894935L (no) * 1989-12-08 1991-06-10 Premix As Anordning til bruk ved fremstilling av betong.
FR2751911B1 (fr) * 1996-07-31 2000-06-16 Mbt Holding Ag Systeme de controle et de distribution pour malaxeur a beton et procede d'utilisation
SE535968C2 (sv) * 2011-07-15 2013-03-12 Minidea Ab Anordning och metod för hantering av cementprodukter

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2587531A (en) * 1951-02-05 1952-02-26 Conveyor Company Inc Method of and apparatus for proportioning the constituents of materials
US2750144A (en) * 1953-06-22 1956-06-12 Richard C Beckwith Methods and apparatus for controllably dispensing moisture bearing ingredients
US2954215A (en) * 1956-10-19 1960-09-27 Superlite Builders Supply Comp Moisture control apparatus
US2968463A (en) * 1959-02-27 1961-01-17 Noble Bert Batching device
DE1188915B (de) * 1963-04-26 1965-03-11 Heise Carl Hermann Fahrbare Sieb- und Mischmaschine fuer bituminoese Strassenbaustoffe, bei der im Mischturm ueber den Vorsilos ein Schwingsieb angeordnet ist
US3186596A (en) * 1962-01-25 1965-06-01 Industrial Nucleonics Corp Concrete batch blending control system
US4397561A (en) * 1981-05-11 1983-08-09 William A. Strong Slurry production system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2258253B1 (de) * 1974-01-21 1978-03-17 Lerebourg Michel
DE2545792A1 (de) * 1975-10-13 1977-04-14 Reinhold Bien Steuervorrichtung und verfahren zur steuerung der dosierung von mit einem mischgut zu vermischenden zugabemengen
DE2855324C2 (de) * 1978-12-21 1986-11-27 Elba-Werk Maschinen-Gesellschaft Mbh & Co, 7505 Ettlingen Verfahren zur Regelung der Wasserzugabe bei der Betonzubereitung und Vorrichtung zur Durchführung des Verfahrens
FI65566C (fi) * 1982-02-09 1984-06-11 Flowcon Oy Foerfarande foer framstaellning av betongmassa

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2587531A (en) * 1951-02-05 1952-02-26 Conveyor Company Inc Method of and apparatus for proportioning the constituents of materials
US2750144A (en) * 1953-06-22 1956-06-12 Richard C Beckwith Methods and apparatus for controllably dispensing moisture bearing ingredients
US2954215A (en) * 1956-10-19 1960-09-27 Superlite Builders Supply Comp Moisture control apparatus
US2968463A (en) * 1959-02-27 1961-01-17 Noble Bert Batching device
US3186596A (en) * 1962-01-25 1965-06-01 Industrial Nucleonics Corp Concrete batch blending control system
DE1188915B (de) * 1963-04-26 1965-03-11 Heise Carl Hermann Fahrbare Sieb- und Mischmaschine fuer bituminoese Strassenbaustoffe, bei der im Mischturm ueber den Vorsilos ein Schwingsieb angeordnet ist
US4397561A (en) * 1981-05-11 1983-08-09 William A. Strong Slurry production system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1000379C2 (nl) * 1995-05-17 1996-11-19 Arwo Bv Houder voor het transporteren van een korrel- of poedervormig materiaal.
EP0743149A1 (de) * 1995-05-17 1996-11-20 B.V. Arwo Behälteraggregat für den Transport von pulverförmigem oder körnigem Gut
WO1997026121A1 (de) * 1996-01-18 1997-07-24 Bayosan Wachter Gmbh & Co. Kg Verfahren zur herstellung von fliess- und/oder pumpfähigen baustoffen, insbesondere fliessestrichen
GB2416134A (en) * 2004-07-13 2006-01-18 Innovation Holdings Apparatus and method for manufacturing concrete
US7386368B2 (en) 2005-06-17 2008-06-10 Icrete, Llc Methods and systems for manufacturing optimized concrete
US7581903B1 (en) 2006-06-08 2009-09-01 Thermoforte, Inc. Method of manufacture and installation flowable thermal backfills

Also Published As

Publication number Publication date
SE8306098L (sv) 1985-05-08
SE8306098D0 (sv) 1983-11-07
SE443741B (sv) 1986-03-10
WO1986006677A1 (en) 1986-11-20
EP0199884A3 (de) 1987-01-14

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