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WO1994023279A1 - Dispositif de determination de la teneur en liant d'un echantillon d'un materiau de construction bitumineux - Google Patents

Dispositif de determination de la teneur en liant d'un echantillon d'un materiau de construction bitumineux Download PDF

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Publication number
WO1994023279A1
WO1994023279A1 PCT/EP1994/001031 EP9401031W WO9423279A1 WO 1994023279 A1 WO1994023279 A1 WO 1994023279A1 EP 9401031 W EP9401031 W EP 9401031W WO 9423279 A1 WO9423279 A1 WO 9423279A1
Authority
WO
WIPO (PCT)
Prior art keywords
sample
furnace
oven
heater
wall
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.)
Ceased
Application number
PCT/EP1994/001031
Other languages
German (de)
English (en)
Other versions
WO1994023279B1 (fr
Inventor
Joachim Hutter
Manfred Pflanz
Franz Laubenthal
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.)
Strassentest Acs Baustoff-Pruefsysteme Vertriebs GmbH
Original Assignee
Strassentest Acs Baustoff-Pruefsysteme Vertriebs GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE9305275U external-priority patent/DE9305275U1/de
Application filed by Strassentest Acs Baustoff-Pruefsysteme Vertriebs GmbH filed Critical Strassentest Acs Baustoff-Pruefsysteme Vertriebs GmbH
Priority to DE4491893T priority Critical patent/DE4491893D2/de
Priority to AU65644/94A priority patent/AU6564494A/en
Publication of WO1994023279A1 publication Critical patent/WO1994023279A1/fr
Publication of WO1994023279B1 publication Critical patent/WO1994023279B1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
    • G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/42—Road-making materials

Definitions

  • the invention relates to a device for determining the binder content of samples of bituminous building materials by thermal decomposition, in particular of asphalts, comprising an oven which receives a sample, has a closable opening and a weighing device for determining the weight of the sample.
  • DE 38 08 888 AI or DD 113 407 discloses a method for determining the binder content of bituminous building materials, in particular asphaltene, in which a sample of the building material is weighed, the binder is removed from the sample, the sample is weighed again and the binder content is selected the weight loss of the sample due to the removal of the binder.
  • the binder is removed from the sample by its thermal degradation.
  • the samples can be placed in an oven, which is connected via a hanger to a scale below the oven for continuous weight measurement (EP 0 333 063 A2).
  • a method and a device for determining the weight ratios of the assembled components of asphalt are described in DE-OS 2 107 058. Bitumen is separated using solvents.
  • the present invention is based on the problem of providing a device of the type mentioned at the beginning, with the aid of which the binder content is very precise can be determined, while at the same time ensuring that different samples can be tested within short time units. At the same time, errors caused by equipment in particular are to be eliminated.
  • the task is among others solved in that the oven has at least one controllable coolable outer jacket (cold wall oven).
  • the heater which heats the surface of the specimen, is preferably arranged in the cold-wall furnace, at least above the surface of the specimen receiving the specimen.
  • the teaching according to the invention enables structurally simple measures to be used to evaluate samples one after the other in short time intervals. Reproducible results are also ensured, in particular, by the fact that a spatially uniform temperature field is generated in the sample material itself by the areal effective heating.
  • the clear distance X between the surface of the sample and the facing flat heater, which is approximately 1.5 to 5 times the sample layer thickness.
  • the clear distance X can be approximately 50-100 mm.
  • the invention is characterized in that the supply of the reaction gases (combustion air) as well as the removal of the gaseous reaction products takes place via a transverse flow in the head region of the furnace, that is to say above the sample material. This results in an equalization of the reaction conditions.
  • the air supply during the heating of the samples is preferably regulated in such a way that ignition of the combustible gases formed during the thermal decomposition is prevented.
  • the sample itself is preferably distributed flat on a sieve insert of the sample holder and covered on the outside with a cover sieve.
  • the furnace has a closable opening in a side wall or a side wall itself can be designed as a closure opening.
  • the sample temperature is continuously measured by temperature measuring points in the sample or by representative measuring positions on the sample holder in order to be able to provide sufficiently reliable information about the relevant temperatures of the sample or the sample material.
  • the sample receptacle can be designed as a cup-shaped sample container, in which at least one sample dish or a plurality of sample dishes spaced apart from one another can be introduced, which in turn run at a distance from the inner wall of the sample container.
  • the sample holder is designed as a sieve set, which consists of a closed bottom, several sieves of different mesh sizes and empty rings running between them, which are provided with perforations on the circumference in order to improve the ventilation during the combustion process.
  • the parts are plugged into each other and are transported using a bracket that is pushed into tabs on the floor.
  • this includes e.g. Weighing device on the underside of the oven has an adapter which can be spaced apart from the weighing cell of the weighing device and in turn can be connected to the carrier element like a stamp.
  • the former can be set in vibration in such a way that the sample holder undergoes a shaking movement. This can significantly reduce the analysis time.
  • an oscillating device which comprises an oscillating magnet with a lifting cylinder, which is mounted elastically relative to the furnace or a frame receiving the latter, and that the lifting cylinder is indirect or is directly connected to the adapter.
  • the lifting cylinder passes through a base plate that receives the load cell, which in turn is preferably arranged centrally. As a result, the carrier element penetrates the furnace floor itself centrally.
  • a gas distribution element can be provided which starts from the inside of the head of the furnace and is preferably designed as a gas distribution ring. There may be an excess supply of combustion gases to accelerate the thermal decomposition of the binder.
  • a further development of the invention provides that the interior of the oven is connected via a bypass to a flue gas duct which emanates from a flue gas blower.
  • the cold wall furnace itself has a double jacket, to the interior of which at least one or more cooling fans are connected.
  • the cooling fans are preferably operated in suction mode.
  • resistance elements preferably in the form of a meander heater, can be arranged concentrically around the inner wall of the furnace.
  • a circumferential radiant panel is provided within the double jacket.
  • FIG. 1 shows a section through a first embodiment of a thermal analysis device intended for bituminous building materials
  • 2 shows a section through the thermal analysis device according to FIG. 1 along the line BB
  • FIG. 3 shows a section through the thermal analysis device according to FIG. 2 along the line C -
  • 1 to 3 show various sectional representations of a first embodiment of a thermal analysis device (10) for determining the binder content of bituminous building materials, in particular asphalt.
  • the weight of the sample should be tracked during the thermal degradation of the originally present binder or the initial weight of a pre-dried sample and its weight after the thermal decomposition of the binder should be determined.
  • the thermal analysis device (10) comprises a housing (12), in the center of which a cold wall oven (14) is arranged, in which the samples (not shown) are introduced and their weight or weight changes during the thermal decomposition of the binders are to be determined.
  • the cold wall furnace (14) of cylindrical shape comprises an inner wall (16) and an outer wall (18) which delimit an annular space to which cooling fans (20) and (22) are connected in order to allow the cold wall furnace (14 ) ensure.
  • the cooling air flows out through an exhaust pipe (24).
  • a circumferential radiant panel (26) is arranged in the annular space formed by the inner and outer walls (16) or (18), around which radiation from a resistance element in the form of a meandering heater (28) arranged along the inner wall (16) enters the interior of the oven (14) to reflect.
  • a load cell (30) is provided, which is arranged below the furnace (14).
  • the load cell is attached to a holding plate (32), which in turn starts from an oven frame (34).
  • the adapter (38) can be spaced apart from the load cell (30) by means of a lifting frame (40) so that the oscillating or vibrating movement caused by an oscillating magnet (50) cannot be transmitted to the load cell (30).
  • the lifting cylinder (42) is mounted in a plate (44) which is connected to a base plate (48) of the furnace frame (34) via elastic spacer elements (46).
  • An electromagnet (50) emanates from the base plate (48), via which the lifting cylinder (42) is set in vibration.
  • a carrier element or pin (52) extends from the adapter (38) and passes through the bottom (54) of the furnace (14) centrally and carries a sample container (56) in which an embodiment example has several sample trays (59) spaced apart from one another. are arranged to accommodate the samples to be analyzed.
  • the sample trays (59) are, on the one hand, spaced apart from one another in the sample tray container and, on the other hand, also run at a distance from the inner wall thereof.
  • the sample container (56) is open on the furnace lid side.
  • the sample container (56) preferably consists of a closed bottom surface and sieves of different mesh sizes arranged one above the other, which enable a pre-classification. There are empty rings between the sieves, the peripheral walls of which have openings to improve the combustion process.
  • the sample container is closed on the lid side with a close-meshed mesh to prevent it from jumping out or being sucked off with sample particles.
  • the furnace (14) has a cover (58) which comprises a radiant panel (60) and an insulating plate (62) for thermal insulation.
  • a gas spring (64) is also provided.
  • a gas distributor device (66) is provided, which starts from the cover (58) and is designed in a ring shape.
  • the gas distributor device (66) is to be connected to compressed air via a line (68) via a coupling (70).
  • a shut-off valve (72) and a variable area compressed air meter (74) which is intended to regulate the supply of combustion air via the air distribution device (66).
  • a connection, a so-called bypass (76), emanates from the inside of the oven and opens into a channel (78) that leads from one Flue gas fan (80) goes out.
  • Thermocouples (82) and (84) are provided to determine the temperature both inside and outside the furnace (14).
  • Measuring and display devices by means of which the weight of the samples are determined or ascertained, are arranged on the housing (12), in the exemplary embodiment a monitor (86), a computer (88), a printer (90) and a control unit with a temperature controller (92) and a main switch (94).
  • the cover (58) can be locked via an electromagnetic door closer (94).
  • a limit switch (96) is also arranged, which interrupts the power supply for the meander heating when the cover (58) is open.
  • the furnace (14) is designed as a cold-wall furnace, several samples can be analyzed in a short time sequence.
  • the samples themselves can be easily removed from the oven (14) because the load cell (30) is not a hindrance. Because of the possibility of decoupling between the load cell and the punch (52) which penetrates the furnace floor (54) and which holds the sample pan container (46), there is also the possibility that the samples are subjected to a shaking movement, whereby the thermal decomposition of the binder can be accelerated.
  • the entire thermal analysis device (10) has a compact structure and can be connected with the exhaust pipes (24) and (78) to a stationary or also to a mobile filter device which could be flanged to the housing (12).
  • FIGS. 1 to 3 show, purely schematically, an arrangement for binder thermal analysis that is particularly noteworthy and has its own inventive character, and the associated peripheral units are shown purely schematically.
  • the centerpiece of the arrangement is a cold-wall flat oven (100), which - according to the exemplary embodiment in FIGS. 1 to 3 - is penetrated on the bottom by a coupling rod (102) via which a connection between a weighing device (104) is located below the bottom (100) is arranged, and a cup-shaped sample holder (106) is produced.
  • the weighing device (104) can be lowered via a lifting device (108) so that the sample holder (106) is decoupled.
  • a sample tray (110) can be introduced within the sample holder (106), which is designed as a sieve insert and runs at a distance from the bottom surface of the sample holder (106).
  • the sample to be analyzed is spread over the bottom surface of the sieve insert.
  • the sieve insert (110) is covered by a further sieve (112).
  • the cold-wall flat furnace (100) according to FIG. 4 can be closed or opened via a closure element (114) provided in a side wall, the closure element (114) with the sample holder (106 ) can be connected in order - as the right part of FIG. 4 illustrates - to be able to pull the closure (114) together with the sample holder (106) via horizontally extending guides. In this way it is easy to remove or insert the sieve insert (110) possible in the sample holder (106).
  • FIGS. 4a and 4b it is provided to close the furnace with a hinged cover (FIG. 4a) or a cover that can be raised or lowered as a unit (FIG. 4b).
  • a heater e.g. arranged in the form of radiant heaters, which are surrounded by reflectors facing away from the sample. If necessary, a corresponding surface heating (118) can also be provided below the sample holder (106).
  • the reaction gases are led via a cross flow above the sample from an inlet (120) to a flue gas outlet (122), from which the flue gas or the gaseous reaction products are sucked off by a fan (126) via a filter (124) and e.g. then, if necessary, be released into the environment via a further filter device.
  • the air supply during the heating of the sample is preferably regulated in such a way that ignition of the combustible gases formed during the thermal decomposition is prevented.
  • the temperature inside the oven (100) is monitored e.g. Via temperature measuring points (120) which are in the sample or through representative measuring positions on the sample holder (106) or inside the furnace.
  • a corresponding measuring point is identified by way of example with the reference symbol (128).
  • the cold-wall flat furnace (100) is - according to the embodiment of FIGS. 1 to 3 - designed in a double jacket design, with cooling air flowing through the jacket. This is indicated by the dashed lines.
  • the cooling air flowing through the double jacket is fed via a closure flap (130) into the line carrying the flue gas in order to be sucked off via the fan (126).
  • the clear distance between the sample surface and the flat or flat radiating heater should be (116) be approximately 1.5 to 5 times the layer thickness of the sample, which in turn should be spread out over the entire area of the sample pan (110).
  • the layer thickness is preferably between 20 and 30 mm and the distance to the heater (116) is between 50 and 100 mm.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Immunology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Working-Up Tar And Pitch (AREA)
  • Road Paving Machines (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Un dispositif de détermination de la teneur en liant d'échantillons de matériaux de construction bitumineux, notamment des asphaltes, comprend un four (14, 100) pourvu d'un chauffage et d'un logement à échantillons (56, 58, 105, 112) et un système de pesage (30, 104) qui permet de déterminer le poids de l'échantillon. Afin de pouvoir contrôler différents échantillons à des intervalles réduits, on utilise un four à parois froides refroidissables de manière réglable. Afin d'obtenir des résultats reproductibles, il est en outre prévu que les échantillons soient chauffés en surface.
PCT/EP1994/001031 1993-04-07 1994-04-01 Dispositif de determination de la teneur en liant d'un echantillon d'un materiau de construction bitumineux Ceased WO1994023279A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE4491893T DE4491893D2 (de) 1993-04-07 1994-04-01 Vorrichtung zur Ermittlung des Bindemittelgehaltes einer Probe eines bituminösen Baustoffs
AU65644/94A AU6564494A (en) 1993-04-07 1994-04-01 Device for determining the binder content of a bituminous construction material sample

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE9305275U DE9305275U1 (de) 1993-04-07 1993-04-07 Geräte zur Ermittlung des Bindemittelgehaltes bituminöser Baustoffe
DEG9305275.8U 1993-04-07
DE4335667A DE4335667A1 (de) 1993-04-07 1993-10-20 Vorrichtung zur Ermittlung des Bindemittelgehaltes einer Probe eines bituminösen Baustoffs
DEP4335667.2 1993-10-20

Publications (2)

Publication Number Publication Date
WO1994023279A1 true WO1994023279A1 (fr) 1994-10-13
WO1994023279B1 WO1994023279B1 (fr) 1994-11-24

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ID=25930540

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1994/001031 Ceased WO1994023279A1 (fr) 1993-04-07 1994-04-01 Dispositif de determination de la teneur en liant d'un echantillon d'un materiau de construction bitumineux

Country Status (3)

Country Link
AU (1) AU6564494A (fr)
DE (2) DE9317009U1 (fr)
WO (1) WO1994023279A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5799596A (en) * 1994-12-14 1998-09-01 Barnstead/Thermolyne Corporation Ashing furnace and method
EP0965832A3 (fr) * 1998-06-12 2000-06-07 Troxler Electronic Laboratories, Inc. Procédé et dispositif pour l'analyse de contenu d'asphalte
CN105973748A (zh) * 2016-06-08 2016-09-28 山西省交通科学研究院 一种沥青混合料抗剥落性能测试装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101389914B (zh) 2006-03-23 2012-07-25 株式会社村田制作所 热处理炉

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB802521A (en) * 1955-02-24 1958-10-08 Cawood Wharton & Co Ltd An improved method and apparatus for determining the combustible content of materials
GB1385488A (en) * 1971-08-13 1975-02-26 Oertling Ltd Furnace for a thermogravimetric microbalance
US3902354A (en) * 1969-11-20 1975-09-02 Columbia Scient Ind Thermogravimetric analysis apparatus
US4802441A (en) * 1987-01-08 1989-02-07 Btu Engineering Corporation Double wall fast cool-down furnace
EP0333063A2 (fr) * 1988-03-17 1989-09-20 Hermann Riede Strassen- Und Tiefbau Gmbh & Co. Kg Procédé et dispositif de détermination de la teneur en liants de matériaux de construction bitumineux
US4971023A (en) * 1989-03-21 1990-11-20 Roto-Flex Oven Company Dual compartment induced circulation oven
DE4218032A1 (de) * 1991-06-07 1993-01-14 Baehr Heinz Ludwig Dipl Ing Ofen zur thermoanalyse

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB802521A (en) * 1955-02-24 1958-10-08 Cawood Wharton & Co Ltd An improved method and apparatus for determining the combustible content of materials
US3902354A (en) * 1969-11-20 1975-09-02 Columbia Scient Ind Thermogravimetric analysis apparatus
GB1385488A (en) * 1971-08-13 1975-02-26 Oertling Ltd Furnace for a thermogravimetric microbalance
US4802441A (en) * 1987-01-08 1989-02-07 Btu Engineering Corporation Double wall fast cool-down furnace
EP0333063A2 (fr) * 1988-03-17 1989-09-20 Hermann Riede Strassen- Und Tiefbau Gmbh & Co. Kg Procédé et dispositif de détermination de la teneur en liants de matériaux de construction bitumineux
US4971023A (en) * 1989-03-21 1990-11-20 Roto-Flex Oven Company Dual compartment induced circulation oven
DE4218032A1 (de) * 1991-06-07 1993-01-14 Baehr Heinz Ludwig Dipl Ing Ofen zur thermoanalyse

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5799596A (en) * 1994-12-14 1998-09-01 Barnstead/Thermolyne Corporation Ashing furnace and method
US5943969A (en) * 1994-12-14 1999-08-31 Barnstead/Thermolyne Corporation Ashing furnace and method
EP0965832A3 (fr) * 1998-06-12 2000-06-07 Troxler Electronic Laboratories, Inc. Procédé et dispositif pour l'analyse de contenu d'asphalte
US6440746B1 (en) 1998-06-12 2002-08-27 Troxler Electronic Laboratories, Inc. Method and apparatus for analyzing asphalt content
CN105973748A (zh) * 2016-06-08 2016-09-28 山西省交通科学研究院 一种沥青混合料抗剥落性能测试装置

Also Published As

Publication number Publication date
DE9317009U1 (de) 1994-03-03
AU6564494A (en) 1994-10-24
DE4491893D2 (de) 1998-03-19

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