EP0319702A2 - Surfacing for supporting course and method of its manufacturing - Google Patents

Surfacing for supporting course and method of its manufacturing Download PDF

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Publication number
EP0319702A2
EP0319702A2 EP88118172A EP88118172A EP0319702A2 EP 0319702 A2 EP0319702 A2 EP 0319702A2 EP 88118172 A EP88118172 A EP 88118172A EP 88118172 A EP88118172 A EP 88118172A EP 0319702 A2 EP0319702 A2 EP 0319702A2
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EP
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Prior art keywords
bitumen
water content
din
hydraulic binder
content
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EP88118172A
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German (de)
French (fr)
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EP0319702A3 (en
EP0319702B1 (en
Inventor
Heinz Dipl.-Ing. Goldt
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Deutag Asphalttechnik GmbH
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Deutag Asphalttechnik GmbH
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Priority to AT88118172T priority Critical patent/ATE67540T1/en
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Publication of EP0319702A3 publication Critical patent/EP0319702A3/en
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Publication of EP0319702B1 publication Critical patent/EP0319702B1/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C7/00—Coherent pavings made in situ
    • E01C7/08—Coherent pavings made in situ made of road-metal and binders
    • E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
    • E01C7/26—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre

Definitions

  • the present invention relates to a covering for base layers, in particular according to ZTVT-StB 86, consisting of natural and / or artificial minerals and a binder mixture of bitumen and hydraulic binder.
  • the invention further relates to the method for producing such coverings.
  • ZTVT-StB 86 contains the additional technical regulations and guidelines for base layers in road construction, published by the Federal Ministry of Transport, Road Construction Department.
  • the base layers for road construction are then divided into three classes, namely base layers without binders, base layers with hydraulic binders and base layers with bituminous binders.
  • the base layers without binders are generally used as the bottom base layer. These are mixtures of mineral mixtures graded according to the regulations.
  • Base layers with hydraulic binders consist of unbroken and / or broken mineral mixtures and hydraulic binders. It is a very rigid construction that does not allow any deformation.
  • the disadvantage of these base layers is the very high sensitivity to cracks, which can penetrate into the bituminous ceilings above.
  • Base courses with hydraulic binders are mainly used under cement-bound road surfaces.
  • Base layers with bituminous binders are a mixture that consists of graded minerals and road bitumen or pitch bitumen or highly viscous road pitch as a binder. These base layers are manufactured in hot installation.
  • bituminous base layers With bituminous base layers, deformations within the road construction can occur under heavy traffic loads and unfavorable influences, especially if the substructure is not sufficiently load-bearing or soft (for example, rutting).
  • the advantage of bituminous base layers is that they are very flexible and therefore remain largely free of cracks.
  • a method for producing a building material for base layers for road superstructure consisting of a mineral grain mixture and, based on the weight of the mineral grain mixture, 2 to 15 parts by weight of a hydraulically active filler, 1 to 5 parts by weight of bitumen as Binder and 4 to 15 parts by weight of water using mineral grain coated with bitumen, 70 to 90% by weight of the mineral grain mixture being mixed with the hydraulically active filler and the water and separately the remaining 30 to 10% by weight of the mineral grain mixture with bitumen or tar or a mixture thereof, whereupon the two mixtures are roughly mixed together.
  • This process is intended to create base layers that have an approximately high load-bearing capacity like cement floor, but in any case have the load-bearing capacity of the hydraulically consolidated mineral mixture and have a self-healing ability that is characteristic of the construction methods with bitumen or tar.
  • the hydraulic setting is slowed down by the addition of bitumen, so that no large, closed, formed plates can arise, which also result in large tears when torn apart. Rather, a large number of small, irregular cracks are deliberately sought, but these are partially bonded to one another by the bitumen.
  • the adhesive force must be maintained, which gives the building material a self-healing ability.
  • a maximum of 30% by weight of the grains of the mineral mixture may be coated with the bitumen, since a building material in which the coating of the mineral material with the bitumen binder exceeds the entire 30% by weight no longer achieves the task can. This method has obviously not proven itself in practice, so that the patent was dropped again relatively early after it was granted.
  • the manufacture of a semi-rigid covering for traffic areas according to DE-AS 26 23 556 is based on a similar principle, in which a void-rich supporting structure made of a mineral mixture coated with bituminous binders is used, the cavities of which are completely filled with a cement mortar with a binder additive and in which the cement mortar contains a bitumen emulsion as a binder additive.
  • a void-rich, coarse-grained mineral mixture is pre-coated with bitumen, tar or bituminous binders modified with additives and a mortar is made separately from a sand mixture with the addition of water, cement and a bitumen emulsion, then the whole is mixed, transported, installed and condensed.
  • the pores of the coarse-grained portion coated with bitumen are filled with a hydraulically setting, finely divided component. No information is available on the amounts of the binders used.
  • bitumen emulsion-asphalt mixtures with mixed binding material for road construction are known, in which the cationic bitumen emulsion and an alkaline earth metal oxide and / or hydroxide containing hydraulic powder are used together with conventional mineral additives.
  • the asphalt mixtures described therein contain 0.5 to 8% by weight of hydraulic powder and 2.5 to 10% by weight of cationic bitumen emulsion and 82 to 97% by weight of conventional mineral additives. From the examples it can be seen that at least 7% bitumen emulsion and at least 3% alkaline ash were used and that road surfaces were then produced therefrom.
  • the effect of this mixture is that the free alkali earth metal oxide or hydroxide content of the hydraulic powder improves the adhesiveness of the bitumen and thereby increases the initial cohesion of the structure.
  • the mineral additive is therefore always premixed dry with the basic ash and only then sprayed with the cationic bitumen emulsion. Mixing only took up to 42 seconds. The mixture was then applied and compacted.
  • the object of the invention is to make base layers, in particular base layers in accordance with ZTVT-StB 86, better, cheaper, more durable and yet easy to produce, the disadvantages of base layers with hydraulic binders and base layers with bituminous binders being avoided, but retaining the advantages thereof should be.
  • the content of bitumen and hydraulic binder is 1.0 to 3.0% by weight, the content of both together is at least 3% by weight. is and
  • the original water content approximately corresponds to the water content that enables the densest storage (measured according to Proctor (DIN 18127)).
  • the content of bitumen and hydraulic binder is preferably 2.0 to 2.5% by weight.
  • the total water content is measured according to the Proctor method (DIN 18127). Water contents are preferably used which are 0 to 20%, based on the water content, below the optimal water content according to Proctor.
  • the anionic aqueous bitumen emulsion which, in contrast to the mixture according to DE-OS 32 45 068, the cationic bitumen emulsion, is not broken by the addition of the alkaline hydraulic binders.
  • the water content used according to the invention which approximately corresponds to the water content which enables the densest storage according to Proctor, is required in order to make the mixture installable and sufficiently compressible on the construction site.
  • the mixture can therefore be premixed, transported, installed and compacted in the usual periods of time without the need for special precautionary measures or very rapid work.
  • the full load-bearing capacity of the material is only achieved after the hydraulic binding agent has set, but the built-in and compacted layer has sufficient load-bearing capacity to absorb the stress caused by construction site traffic and to ensure construction progress.
  • a particular advantage of the base layers according to the invention is that they make do with relatively small amounts of binders, namely 3 to 6% by weight, preferably 4 to 5% by weight, based on the base layer mixture.
  • base layers are formed which, after the hydraulic binder has set, have Marshall stabilities and Marshall flow values which correspond to the requirements of ZTVT-StB-86 table 4.2 for bituminous base layer mix of the type CS for special loads.
  • Another advantage of the method according to the invention is that considerable amounts of recycled building materials can be used as minerals. This material can be added to the minerals alone or in any quantity, provided the particle size distribution, shape and other requirements comply with the regulations of ZTVT-StB 86.
  • the mixtures can be processed in conventional forced or free-fall mixers.
  • the paving is carried out using conventional pavers or the concrete paving train.
  • the compression takes place in the usual way by means of a built-in device and / or roller insert.
  • the base layers obtained in this way are passable and resilient for the further expansion of the pavement.
  • a base course mix of 0/22 mm is used.
  • Limestone was used as a mineral with the composition Limestone grit 65% by weight Limestone crushed stone 30% by weight and Limestone flour 5% by weight.
  • 2.0% by weight of bitumen was added to this mixture in the form of a 50% bitumen emulsion, anionic, with a viscosity of 4 mm / 20 ° C.: 20 to 30 seconds and 2.0% by weight of PZ 35 cement F.
  • the amount of water was measured so that it was 10% below the amount that allows the tightest storage, measured according to Proctor (DIN 18127).
  • the base layer obtained therefrom showed a Marshall stability of 12.0 kN and a Marshall flow value of 2.3 mm after 28 days. This material meets the requirements of ZTVT-StB-86 table 4.2 for bituminous base layer mix of type CS for special demands.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Structures (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Outer Garments And Coats (AREA)
  • Paints Or Removers (AREA)

Abstract

The surfacing for base courses, in particular according to ZTVT-StB 86, consists of nitrogen and/or synthetic minerals and a binder mixture of bitumen and hydraulic binder, where the content of bitumen and that of hydraulic binder are each 1.0 to 3.0% by weight, based on the base course mixture, the content of both together is at least 3% by weight and the total water content corresponds approximately to the water content which permits the greatest compactness, measured according to Proctor (DIN 18,127). The bitumen is added in the form of an anionic aqueous emulsion. The surfacing is economical, stable and simple to prepare and meets the highest requirements.

Description

Gegenstand der vorliegenden Erfindung ist ein Belag für Tragschichten, insbesondere gemäß ZTVT-StB 86, beste­hend aus natürlichen und/oder künstlichen Mineralstof­fen und einem Bindemittelgemisch aus Bitumen und hy­draulischem Bindemittel. Weiterhin betrifft die Erfin­dung das Verfahren zur Herstellung derartiger Beläge.The present invention relates to a covering for base layers, in particular according to ZTVT-StB 86, consisting of natural and / or artificial minerals and a binder mixture of bitumen and hydraulic binder. The invention further relates to the method for producing such coverings.

Die ZTVT-StB 86 enthält die zusätzlichen technischen Vorschriften und Richtlinien für Tragschichten im Stra­ßenbau, herausgegeben vom Bundesministerium für Ver­kehr, Abteilung Straßenbau. Danach werden die Trag­schichten für den Straßenbau in drei Klassen einge­teilt, nämlich Tragschichten ohne Bindemittel, Trag­schichten mit hydraulischen Bindemitteln und Tragschich­ten mit bituminösen Bindemitteln. Die Tragschichten ohne Bindemittel werden im allgemeinen als unterste Tragschicht eingesetzt. Es handelt sich um Gemische aus gemäß den Vorschriften abgestuften Mineralstoffgemi­schen. Tragschichten mit hydraulischen Bindemitteln bestehen aus ungebrochenen und/oder gebrochenen Mine­ralstoffgemischen und hydraulischen Bindemitteln. Es handelt sich hierbei um eine sehr starre Bauweise, die keine Verformungen zuläßt. Der Nachteil dieser Trag­schichten ist die sehr hohe Rißempfindlichkeit, die bis in die darüber liegenden bituminösen Decken durchschla­gen kann. Deshalb findet der Einsatz der Tragschichten mit hydraulischen Bindemitteln überwiegend unter ze­mentgebundenen Fahrbahndecken statt. Bei Tragschichten mit bituminösen Bindemitteln handelt es sich um ein Mischgut, das aus abgestuften Mineralstoffen und Stra­ßenbaubitumen oder Pechbitumen oder hochviskosem Stra­ßenpech als Bindemittel besteht. Diese Tragschichten werden im Heißeinbau hergestellt.ZTVT-StB 86 contains the additional technical regulations and guidelines for base layers in road construction, published by the Federal Ministry of Transport, Road Construction Department. The base layers for road construction are then divided into three classes, namely base layers without binders, base layers with hydraulic binders and base layers with bituminous binders. The base layers without binders are generally used as the bottom base layer. These are mixtures of mineral mixtures graded according to the regulations. Base layers with hydraulic binders consist of unbroken and / or broken mineral mixtures and hydraulic binders. It is a very rigid construction that does not allow any deformation. The disadvantage of these base layers is the very high sensitivity to cracks, which can penetrate into the bituminous ceilings above. For this reason, the base courses with hydraulic binders are mainly used under cement-bound road surfaces. Base layers with bituminous binders are a mixture that consists of graded minerals and road bitumen or pitch bitumen or highly viscous road pitch as a binder. These base layers are manufactured in hot installation.

Bei bituminös gebundenen Tragschichten kann es unter schweren Verkehrsbelastungen und ungünstigen Einflüs­sen, insbesondere bei nicht ausreichend tragfähigem Unterbau bzw. weichem Untergrund, zu Verformungen in­nerhalb der Straßenkonstruktion kommen (zum Beispiel Spurrinnenbildung). Der Vorteil bituminöser Tragschich­ten ist, daß sie sehr flexibel sind und daher weitge­hend rissefrei bleiben.With bituminous base layers, deformations within the road construction can occur under heavy traffic loads and unfavorable influences, especially if the substructure is not sufficiently load-bearing or soft (for example, rutting). The advantage of bituminous base layers is that they are very flexible and therefore remain largely free of cracks.

Aus der DE-PS 22 65 308 ist ein Verfahren bekannt zum Herstellen eines Baustoffes für Tragschichten für den Straßenoberbau, bestehend aus einem Mineralkorngemisch und, bezogen auf das Gewicht des Mineralkorngemisches, 2 bis 15 Gewichtsteilen eines hydraulisch wirksamen Füllstoffes, 1 bis 5 Gewichtsteilen Bitumen als Binde­mittel und 4 bis 15 Gewichtsteilen Wasser unter Einsatz von mit Bitumen umhülltem Mineralkorn, wobei 70 bis 90 Gew.-% des Mineralkorngemisches mit dem hydraulisch wirksamen Füllstoff und dem Wasser vermischt und ge­trennt davon die restlichen 30 bis 10 Gew.-% des Mine­ralkorngemisches mit Bitumen oder Teer oder einer Mi­schung davon vermengt werden, worauf die beiden Mischun­gen grob miteinander vermischt werden. Durch dieses Verfahren sollen Tragschichten entstehen, die eine an­nähernd hohe Tragfähigkeit wie Zementboden, auf alle Fälle aber die Tragfähigkeit des hydraulisch verfestig­ten Mineralgemisches besitzen und ein Selbstheilungs­vermögen aufweisen, das den Bauweisen mit Bitumen oder Teer zu eigen ist. Bei dem Verfahren wird die hydrauli­sche Abbindung durch die Zugabe von Bitumen abgebremst, so daß keine großen geschlossenen, ausgebildeten Plat­ten entstehen können, die beim Auseinanderreißen auch große Risse ergeben. Es wird vielmehr bewußt eine Viel­zahl von kleinen, unregelmäßigen Rissen angestrebt, die jedoch durch das Bitumen miteinander teilweise verklebt werden.From DE-PS 22 65 308 a method is known for producing a building material for base layers for road superstructure, consisting of a mineral grain mixture and, based on the weight of the mineral grain mixture, 2 to 15 parts by weight of a hydraulically active filler, 1 to 5 parts by weight of bitumen as Binder and 4 to 15 parts by weight of water using mineral grain coated with bitumen, 70 to 90% by weight of the mineral grain mixture being mixed with the hydraulically active filler and the water and separately the remaining 30 to 10% by weight of the mineral grain mixture with bitumen or tar or a mixture thereof, whereupon the two mixtures are roughly mixed together. This process is intended to create base layers that have an approximately high load-bearing capacity like cement floor, but in any case have the load-bearing capacity of the hydraulically consolidated mineral mixture and have a self-healing ability that is characteristic of the construction methods with bitumen or tar. In the process, the hydraulic setting is slowed down by the addition of bitumen, so that no large, closed, formed plates can arise, which also result in large tears when torn apart. Rather, a large number of small, irregular cracks are deliberately sought, but these are partially bonded to one another by the bitumen.

Die Verklebungskraft muß erhalten bleiben, wodurch der Baustoff ein Selbstheilungsvermögen erhält. Bei diesem Verfahren dürfen höchstens 30 Gew.-% der Körner des Mineralgemisches von dem Bitumen umhüllt sein, da ein Baustoff, bei dem die Umhüllung des Mineralstoffes mit dem Bindemittel Bitumen über die gesamten 30 Gew.-% hinausgeht, die gestellte Aufgabe nicht mehr lösen kann. Dieses Verfahren hat sich offensichtlich in der Praxis nicht bewährt, so daß auch das Patent relativ früh nach der Erteilung wieder fallen gelassen wurde. Auf einem ähnlichen Prinzip beruht die Herstellung ei­nes halbstarren Belages für Verkehrsflächen gemäß DE-AS 26 23 556, bei dem ein hohlraumreiches Traggerüst aus einer mit bituminösen Bindemitteln umhüllten Mineralmi­schung eingesetzt wird, dessen Hohlräume vollständig mit einem Zementmörtel mit Bindemittelzusatz ausgefüllt sind und bei dem der Zementmörtel als Bindemittelzusatz eine Bitumenemulsion enthält. Auch bei diesem Verfahren wird getrennt voneinander eine hohlraumreiche, grobkör­nige Mineralmischung mit Bitumen, Teer oder mit Zusatz­stoffen modifizierten bituminösen Bindemitteln vorum­hüllt und separat aus einer Sandmischung unter Zugabe von Wasser, Zement und einer Bitumenemulsion ein Mörtel hergestellt, dann das Ganze gemischt, transportiert, eingebaut und verdichtet. Auch bei diesem Verfahren werden somit die Poren des mit Bitumen überzogenen grobkörnigen Anteils mit einer hydraulisch abbindenden feinteiligeren Komponente ausgefüllt. Angaben über die Mengen der verwendeten Bindemittel liegen nicht vor.The adhesive force must be maintained, which gives the building material a self-healing ability. In this method, a maximum of 30% by weight of the grains of the mineral mixture may be coated with the bitumen, since a building material in which the coating of the mineral material with the bitumen binder exceeds the entire 30% by weight no longer achieves the task can. This method has obviously not proven itself in practice, so that the patent was dropped again relatively early after it was granted. The manufacture of a semi-rigid covering for traffic areas according to DE-AS 26 23 556 is based on a similar principle, in which a void-rich supporting structure made of a mineral mixture coated with bituminous binders is used, the cavities of which are completely filled with a cement mortar with a binder additive and in which the cement mortar contains a bitumen emulsion as a binder additive. In this process, too, a void-rich, coarse-grained mineral mixture is pre-coated with bitumen, tar or bituminous binders modified with additives and a mortar is made separately from a sand mixture with the addition of water, cement and a bitumen emulsion, then the whole is mixed, transported, installed and condensed. With this method, too, the pores of the coarse-grained portion coated with bitumen are filled with a hydraulically setting, finely divided component. No information is available on the amounts of the binders used.

Aus der DE-OS 32 45 068 sind Bitumenemulsion-Asphaltge­mische mit Mischbindestoff für den Straßenbau bekannt, bei denen die kationaktive Bitumenemulsion und ein Al­kalierdmetalloxid und/oder -hydroxid enthaltendes hy­draulisches Pulver zusammen mit üblichen Mineralzusät­zen eingesetzt werden.From DE-OS 32 45 068 bitumen emulsion-asphalt mixtures with mixed binding material for road construction are known, in which the cationic bitumen emulsion and an alkaline earth metal oxide and / or hydroxide containing hydraulic powder are used together with conventional mineral additives.

Bei diesen Gemischen wird die saure Reaktion der beim Brechen der Emulsion freiwerdenden wäßrigen Lösung mit niedrigem pH-Wert durch ein entsprechendes Zusetzen von freiem Alkalierdmetalloxid und/oder -hydroxid kompen­siert und neben der Bitumenbindung der Struktur auch eine hydraulische Bindung geschaffen. Die dort beschrie­benen Asphaltgemische enthalten 0,5 bis 8 Gew.-% hydrau­lisches Pulver und 2,5 bis 10 Gew.-% kationaktive Bitu­menemulsion sowie 82 bis 97 Gew.-% übliche Mineralzu­sätze. Aus den Beispielen geht hervor, daß mindestens 7% Bitumenemulsion und mindestens 3% alkalische Asche zur Anwendung gekommen sind und daraus dann Straßenbe­läge hergestellt wurden. Die Wirkung dieses Gemisches besteht darin, daß der freie Alkalierdmetalloxidgehalt oder -hydroxidgehalt des hydraulischen Pulvers die Haftfähigkeit des Bitumens verbessert und dadurch die Ausgangskohäsion der Struktur erhöht. Es wird daher auch stets der Mineralzusatz trocken mit der basischen Asche vorgemischt und erst dann mit der kationaktiven Bitumenemulsion besprüht. Das Mischen dauerte nur bis zu 42 Sekunden. Danach wurde das Gemisch bereits aufge­tragen und verdichtet.With these mixtures, the acidic reaction of the aqueous solution with a low pH value that is released when the emulsion is broken is compensated for by a corresponding addition of free alkali earth metal oxide and / or hydroxide and, in addition to the bitumen bond of the structure, a hydraulic bond is also created. The asphalt mixtures described therein contain 0.5 to 8% by weight of hydraulic powder and 2.5 to 10% by weight of cationic bitumen emulsion and 82 to 97% by weight of conventional mineral additives. From the examples it can be seen that at least 7% bitumen emulsion and at least 3% alkaline ash were used and that road surfaces were then produced therefrom. The effect of this mixture is that the free alkali earth metal oxide or hydroxide content of the hydraulic powder improves the adhesiveness of the bitumen and thereby increases the initial cohesion of the structure. The mineral additive is therefore always premixed dry with the basic ash and only then sprayed with the cationic bitumen emulsion. Mixing only took up to 42 seconds. The mixture was then applied and compacted.

Die Erfindung hat sich die Aufgabe gestellt, Tragschich­ten, insbesondere Tragschichten gemäß ZTVT-StB 86, bes­ser, billiger, haltbarer und dennoch leicht herstellbar zu machen, wobei die Nachteile von Tragschichten mit hydraulischen Bindemitteln und Tragschichten mit bitu­minösen Bindemitteln vermieden, die Vorteile derselben jedoch beibehalten werden sollen.The object of the invention is to make base layers, in particular base layers in accordance with ZTVT-StB 86, better, cheaper, more durable and yet easy to produce, the disadvantages of base layers with hydraulic binders and base layers with bituminous binders being avoided, but retaining the advantages thereof should be.

Diese Aufgabe kann überraschend gut und einfach gelöst werden dadurch, daß, bezogen auf das Tragschichtge­misch, der Gehalt an Bitumen und hydraulischem Binde­mittel je 1,0 bis 3,0 Gew.-% beträgt, der Gehalt an beidem zusammen mindestens 3 Gew.-% beträgt und der ursprüngliche Wassergehalt ungefähr dem Wassergehalt entspricht, der die dichteste Lagerung ermöglicht (ge­messen nach Proctor (DIN 18127)).This problem can be solved surprisingly well and simply in that, based on the base layer mixture, the content of bitumen and hydraulic binder is 1.0 to 3.0% by weight, the content of both together is at least 3% by weight. is and The original water content approximately corresponds to the water content that enables the densest storage (measured according to Proctor (DIN 18127)).

Vorzugsweise beträgt der Gehalt an Bitumen und hydrau­lischem Bindemittel je 2,0 bis 2,5 Gew.-%. Der Gesamt­wassergehalt wird nach dem Proctor-Verfahren (DIN 18127) bemessen. Es kommen vorzugsweise Wassergehalte zur An­wendung, die 0 bis 20%, bezogen auf den Wassergehalt, unter dem optimalen Wassergehalt nach Proctor liegen.The content of bitumen and hydraulic binder is preferably 2.0 to 2.5% by weight. The total water content is measured according to the Proctor method (DIN 18127). Water contents are preferably used which are 0 to 20%, based on the water content, below the optimal water content according to Proctor.

Von entscheidender Bedeutung ist der Einsatz der anio­nischen wäßrigen Emulsion von Bitumen, die im Gegensatz zu dem Gemisch gemäß DE-OS 32 45 068, der kationaktiven Bitumenemulsion, durch den Zusatz der alkalischen hy­draulischen Bindemittel nicht gebrochen wird. Der er­findungsgemäß verwendete Wassergehalt, der ungefähr dem Wassergehalt entspricht, der die dichteste Lagerung nach Proctor ermöglicht, wird benötigt, um das Gemisch auf der Baustelle einbaufähig und ausreichend verdicht­bar zu machen. Das Gemisch kann daher in üblichen Zeit­räumen vorgemischt, transportiert, eingebaut und ver­dichtet werden, ohne daß es dabei besonderer Vorsichts­maßnahmen oder eines sehr raschen Arbeitens bedarf. Die volle Belastbarkeit des Materials wird erst nach dem Abbinden des hydraulischen Bindemittels erreicht, je­doch besitzt die eingebaute und verdichtete Schicht ausreichende Tragfähigkeit, um die Belastung durch den Baustellenverkehr aufzunehmen und den Baufortschritt zu gewährleisten.Of decisive importance is the use of the anionic aqueous bitumen emulsion, which, in contrast to the mixture according to DE-OS 32 45 068, the cationic bitumen emulsion, is not broken by the addition of the alkaline hydraulic binders. The water content used according to the invention, which approximately corresponds to the water content which enables the densest storage according to Proctor, is required in order to make the mixture installable and sufficiently compressible on the construction site. The mixture can therefore be premixed, transported, installed and compacted in the usual periods of time without the need for special precautionary measures or very rapid work. The full load-bearing capacity of the material is only achieved after the hydraulic binding agent has set, but the built-in and compacted layer has sufficient load-bearing capacity to absorb the stress caused by construction site traffic and to ensure construction progress.

Ein besonderer Vorteil der erfindungsgemäßen Trag­schichten ist, daß sie mit relativ geringen Mengen an Bindemitteln auskommen, nämlich 3 bis 6 Gew.-%, vor­zugsweise 4 bis 5 Gew.-%, bezogen auf das Tragschicht­gemisch.A particular advantage of the base layers according to the invention is that they make do with relatively small amounts of binders, namely 3 to 6% by weight, preferably 4 to 5% by weight, based on the base layer mixture.

Es entstehen erfindungsgemäß Tragschichten, die nach Abbinden des hydraulischen Bindemittels Marshall-Stabi­litäten und Marshall-Fließwerte aufweisen, die den An­forderungen der ZTVT-StB-86-Tabelle 4.2 für bituminöses Tragschicht-Mischgut der Art CS für besondere Beanspru­chungen entsprechen.According to the invention, base layers are formed which, after the hydraulic binder has set, have Marshall stabilities and Marshall flow values which correspond to the requirements of ZTVT-StB-86 table 4.2 for bituminous base layer mix of the type CS for special loads.

Ein weiterer Vorteil des erfindungsgemäßen Verfahrens ist, daß erhebliche Mengen von Recyclingbaustoffen als Mineralstoffe eingesetzt werden können. Dieses Material kann allein oder in beliebigen Mengen den Mineralstof­fen zugesetzt werden, sofern die Korngrößenverteilung, die Form und die sonstigen Anforderungen den Vorschrif­ten der ZTVT-StB 86 entsprechen.Another advantage of the method according to the invention is that considerable amounts of recycled building materials can be used as minerals. This material can be added to the minerals alone or in any quantity, provided the particle size distribution, shape and other requirements comply with the regulations of ZTVT-StB 86.

Die Aufbereitung der Gemische kann in üblichen Zwangs- oder Freifallmischern erfolgen. Der Einbau erfolgt mit­tels üblicher Straßenfertiger bzw. durch den Betonein­bauzug. Die Verdichtung erfolgt in üblicher Weise mit­tels Einbaugerät und/oder Walzeneinsatz. Die so erhal­tenen Tragschichten sind für den weiteren Ausbau der Fahrbahndecken befahrbar und belastbar.The mixtures can be processed in conventional forced or free-fall mixers. The paving is carried out using conventional pavers or the concrete paving train. The compression takes place in the usual way by means of a built-in device and / or roller insert. The base layers obtained in this way are passable and resilient for the further expansion of the pavement.

In dem nachfolgenden Beispiel ist eine bevorzugte Aus­führungsform beschrieben.A preferred embodiment is described in the example below.

Beispielexample

Verwendet wird ein Tragschicht-Mischgut 0/22 mm. Als Mineralstoff wurde Kalkstein eingesetzt mit der Zusam­mensetzung Kalksteinsplitt 65 Gew.-% Kalksteinbrechstand 30 Gew.-% und Kalksteinmehl 5 Gew.-%. Diesem Gemisch wurden 2,0 Gew.-% Bitumen zugegeben in Form einer 50%-igen Bitumenemulsion, anionisch, mit einer Viskosität Stv. 4 mm/20°C : 20 bis 30 Sekunden sowie 2,0 Gew.-% Zement PZ 35 F. Die Wassermenge wurde so bemessen, daß sie 10% unter der Menge lag, die die dichteste Lagerung ermöglicht, gemessen nach Proctor (DIN 18127). Die daraus erhaltene Tragschicht zeigte nach 28 Tagen eine Marshall-Stabilität von 12,0 kN und einen Marshall-Fließwert von 2,3 mm. Dieses Material erfüllt die Anforderungen der ZTVT-StB-86-Tabelle 4.2 für bituminöses Tragschicht-Mischgut der Art CS für besondere Beanspruchungen.A base course mix of 0/22 mm is used. Limestone was used as a mineral with the composition Limestone grit 65% by weight Limestone crushed stone 30% by weight and Limestone flour 5% by weight. 2.0% by weight of bitumen was added to this mixture in the form of a 50% bitumen emulsion, anionic, with a viscosity of 4 mm / 20 ° C.: 20 to 30 seconds and 2.0% by weight of PZ 35 cement F. The amount of water was measured so that it was 10% below the amount that allows the tightest storage, measured according to Proctor (DIN 18127). The base layer obtained therefrom showed a Marshall stability of 12.0 kN and a Marshall flow value of 2.3 mm after 28 days. This material meets the requirements of ZTVT-StB-86 table 4.2 for bituminous base layer mix of type CS for special demands.

Claims (9)

1. Belag für Tragschichten, insbesondere gemäß ZTVT-StB 86, bestehend aus natürlichen und/oder künstlichen Mi­neralstoffen und einem Bindemittelgemisch aus Bitumen und hydraulischem Bindemittel, dadurch gekennzeichnet, daß, bezogen auf das Tragschichtgemisch, der Gehalt an Bitumen und hydraulischem Bindemittel je 1,0 bis 3,0 Gew.-% beträgt, der Gehalt an beidem zusammen minde­stens 3 Gew.-% beträgt und der Gesamtwassergehalt unge­fähr dem Wassergehalt entspricht, der die dichteste Lagerung ermöglicht (gemessen nach Proctor (DIN 18127)).1. covering for base layers, in particular in accordance with ZTVT-StB 86, consisting of natural and / or artificial minerals and a binder mixture of bitumen and hydraulic binder, characterized in that, based on the base layer mixture, the content of bitumen and hydraulic binder is 1, 0 to 3.0 wt .-%, the content of both together is at least 3 wt .-% and the total water content corresponds approximately to the water content that enables the densest storage (measured according to Proctor (DIN 18127)). 2. Belag gemäß Anspruch 1, dadurch gekennzeichnet, daß der Gehalt an Bitumen und hydraulischem Bindemittel je 2,0 bis 2,5 Gew.-% beträgt.2. Covering according to claim 1, characterized in that the content of bitumen and hydraulic binder is each 2.0 to 2.5 wt .-%. 3. Belag gemäß einem der Ansprüche 1 oder 2, dadurch ge­kennzeichnet, daß der Gesamtwassergehalt 0 bis 20%, bezogen auf den Wassergehalt, unterhalb dem optimalen Wassergehalt nach Proctor liegt.3. Covering according to one of claims 1 or 2, characterized in that the total water content 0 to 20%, based on the water content, is below the optimal water content according to Proctor. 4. Belag gemäß einem der Ansprüche 1 bis 3, dadurch ge­kennzeichnet, daß das Bitumen in Form einer anionischen wäßrigen Emulsion zugegeben wird.4. Covering according to one of claims 1 to 3, characterized in that the bitumen is added in the form of an anionic aqueous emulsion. 5. Belag gemäß einem der Ansprüche 1 bis 4, dadurch ge­kennzeichnet, daß das hydraulische Bindemittel den Nor­men DIN 1164, DIN 1060 und DIN 18506 entspricht.5. Covering according to one of claims 1 to 4, characterized in that the hydraulic binder corresponds to the standards DIN 1164, DIN 1060 and DIN 18506. 6. Verfahren zur Herstellung von Belägen von Tragschich­ten, insbesondere gemäß ZTVT-StB 86, bestehend aus na­türlichen und/oder künstlichen Mineralstoffen und einem Bindemittelgemisch aus Bitumen und hydraulischem Binde­mittel, dadurch gekennzeichnet, daß die Mineralstoffe ohne Erhitzen gleichzeitig mit je 1,0 bis 3,0 Gew.-% Bitumen und hydraulischem Bindemittel und so viel Was­ser gemischt werden, daß der Wassergehalt ungefähr dem Wassergehalt entspricht, der die dichteste Lagerung ermöglicht, gemessen nach Proctor (DIN 18127), wobei der Gehalt an Bitumen und hydraulischem Bindemittel zusammen mindestens 3 Gew.-% beträgt und das Bitumen in Form einer anionischen wäßrigen Emulsion mit einem Netz­mittel zugegeben wird, und das fertige Gemisch nach dem Einbau in üblicher Weise verdichtet wird.6. Process for the production of coverings of base layers, in particular in accordance with ZTVT-StB 86, consisting of natural and / or artificial minerals and a binder mixture of bitumen and hydraulic binder, characterized in that the minerals simultaneously with 1.0 to 3 each without heating .0% by weight Bitumen and hydraulic binder and so much water are mixed that the water content corresponds approximately to the water content that enables the densest storage, measured according to Proctor (DIN 18127), the bitumen and hydraulic binder content together being at least 3% by weight and the bitumen is added in the form of an anionic aqueous emulsion with a wetting agent, and the finished mixture is compacted in the usual manner after installation. 7. Verfahren gemäß Ansprüch 6, dadurch gekennzeichnet, daß der Gehalt an Bitumen und hydraulischem Bindemittel je 2,0 bis 2,5 Gew.-% beträgt.7. The method according to claims 6, characterized in that the content of bitumen and hydraulic binder is each 2.0 to 2.5% by weight. 8. Verfahren gemäß einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, daß der Gesamtwassergehalt 0 bis 20%, bezogen auf den Wassergehalt, unterhalb dem optimalen Wassergehalt nach Proctor liegt.8. The method according to any one of claims 6 or 7, characterized in that the total water content 0 to 20%, based on the water content, is below the optimal water content according to Proctor. 9. Verfahren gemäß einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß das hydraulische Bindemittel den Normen DIN 1164, DIN 1060 und DIN 18506 entspricht.9. The method according to any one of claims 6 to 8, characterized in that the hydraulic binder corresponds to the standards DIN 1164, DIN 1060 and DIN 18506.
EP88118172A 1987-12-08 1988-11-01 Surfacing for supporting course and method of its manufacturing Expired - Lifetime EP0319702B1 (en)

Priority Applications (1)

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AT88118172T ATE67540T1 (en) 1987-12-08 1988-11-01 COATING FOR BASE COURSES AND METHOD OF MAKING THE SAME.

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DE3741458 1987-12-08
DE3741458 1987-12-08

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0545740A1 (en) * 1991-12-05 1993-06-09 BEUGNET, Société dite Process for double cold mixing of granular material for road construction
FR2725196A1 (en) * 1994-09-29 1996-04-05 Colas Sa Concrete mixt. for roads and floors
WO1999048835A1 (en) * 1998-03-20 1999-09-30 Pci Augsburg Gmbh Flowable, hydraulic setting mortar system
DE102010053406A1 (en) * 2010-12-06 2012-06-06 Joachim Eberhardt Producing cold mix asphalt building material, useful for road construction, using a coarse-grained cavity-rich cold asphalt mixture, comprises mineral grain, bitumen binder and filler materials
WO2013056840A1 (en) * 2011-10-20 2013-04-25 Hermann Kirchner Bauunternehmung Gmbh Method for producing an at least dual-layered asphalt structure, and an asphalt mix therefor

Citations (4)

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Publication number Priority date Publication date Assignee Title
DE2265308A1 (en) * 1972-06-21 1977-07-07 Rheinische Kalksteinwerke Road surfacing material - based on mixture of mineral granules and binder with hydraulic action
DE2623556A1 (en) * 1976-05-26 1977-12-01 Strabag Bau Ag SEMI-RIGID COVERING FOR TRAFFIC AREAS AND PROCESS FOR ITS MANUFACTURING
DE2741137A1 (en) * 1976-10-29 1978-05-03 Muntzer Binder emulsions for bituminous materials - prepd. by adding oxidising, polymerising and/or reducing agents then acid salts and finally emulsion breakers
DE3245068A1 (en) * 1981-12-07 1983-06-09 Zalaegerszegi Közúti Epitö Vállalat, Zalaegerszeg Bitumen emulsion/asphalt mixtures containing a mixed binder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2265308A1 (en) * 1972-06-21 1977-07-07 Rheinische Kalksteinwerke Road surfacing material - based on mixture of mineral granules and binder with hydraulic action
DE2623556A1 (en) * 1976-05-26 1977-12-01 Strabag Bau Ag SEMI-RIGID COVERING FOR TRAFFIC AREAS AND PROCESS FOR ITS MANUFACTURING
DE2741137A1 (en) * 1976-10-29 1978-05-03 Muntzer Binder emulsions for bituminous materials - prepd. by adding oxidising, polymerising and/or reducing agents then acid salts and finally emulsion breakers
DE3245068A1 (en) * 1981-12-07 1983-06-09 Zalaegerszegi Közúti Epitö Vállalat, Zalaegerszeg Bitumen emulsion/asphalt mixtures containing a mixed binder

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0545740A1 (en) * 1991-12-05 1993-06-09 BEUGNET, Société dite Process for double cold mixing of granular material for road construction
FR2684699A1 (en) * 1991-12-05 1993-06-11 Beugnet Sa METHOD OF DOUBLE COLD TREATMENT OF A GRANULAR MATERIAL FOR ROAD TECHNOLOGY
FR2725196A1 (en) * 1994-09-29 1996-04-05 Colas Sa Concrete mixt. for roads and floors
WO1999048835A1 (en) * 1998-03-20 1999-09-30 Pci Augsburg Gmbh Flowable, hydraulic setting mortar system
DE102010053406A1 (en) * 2010-12-06 2012-06-06 Joachim Eberhardt Producing cold mix asphalt building material, useful for road construction, using a coarse-grained cavity-rich cold asphalt mixture, comprises mineral grain, bitumen binder and filler materials
DE102010053406B4 (en) * 2010-12-06 2014-06-12 Joachim Eberhardt Process for the production and installation of an asphalt building material suitable for cold incorporation and corresponding asphalt building material
WO2013056840A1 (en) * 2011-10-20 2013-04-25 Hermann Kirchner Bauunternehmung Gmbh Method for producing an at least dual-layered asphalt structure, and an asphalt mix therefor

Also Published As

Publication number Publication date
EP0319702A3 (en) 1989-08-09
EP0319702B1 (en) 1991-09-18
ATE67540T1 (en) 1991-10-15
DE3864988D1 (en) 1991-10-24

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