EP1469127A1 - Method and device for heat processing bitumen-coated material - Google Patents

Method and device for heat processing bitumen-coated material Download PDF

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Publication number
EP1469127A1
EP1469127A1 EP04290978A EP04290978A EP1469127A1 EP 1469127 A1 EP1469127 A1 EP 1469127A1 EP 04290978 A EP04290978 A EP 04290978A EP 04290978 A EP04290978 A EP 04290978A EP 1469127 A1 EP1469127 A1 EP 1469127A1
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Prior art keywords
water
surfactant
bituminous mix
mix
bituminous
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EP04290978A
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German (de)
French (fr)
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EP1469127B1 (en
Inventor
Alain Romier
Yves Martineau
Jacques David
Maurice Audeon
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LEA-CO FRANCE
LEA-CO INTERNATIONAL
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HTP EST
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    • 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
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/46—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing and placing the materials, e.g. slurry seals

Definitions

  • the present invention relates to methods and devices for hot bituminous mixes.
  • the invention relates to a hot implementation process (i.e. at a temperature higher than ambient temperatures commonly encountered in temperate countries) bituminous comprising aggregates coated in bitumen, this process comprising a step of spreading during which said asphalt is spread on a surface of reception, for example a road or the like.
  • a hot-mix bituminous mix includes always a mineral skeleton coated with hot bitumen. We try to maintain its temperature until the end of its implementation which generally occurs in both hours after its manufacture and transport on the place of implementation.
  • This implementation consists of spread the mixture on the surface to be coated in one layer of defined thickness, regular and homogeneous for example for constitute a road surface (wearing course or seat) or similar work.
  • the hot mix is generally implemented using an asphalt paver which provides all the required mechanical functions that it is completed in the final phase by passing over the layer freshly spread of compactors that provide densification of the mixture.
  • the object of the invention is in particular to improve the workability of the bituminous mix to facilitate its installation implemented, in particular in the aforementioned cases of implementation used at low temperature (but not exclusively in these cases).
  • a method of the kind in question is characterized in that it further comprises, immediately preceding the spreading step, a step addition of water during which water is mixed added with surfactant with the bituminous mix.
  • the invention also relates to a device for implementing the method as defined above, this device comprising means for mixing receiving bituminous mix and provided with minus a water supply supplied with water added with surfactant, and a mix spreader receiving the mix from the mixing means and suitable for spread the bituminous mix.
  • the device is provided with metering means for metering the added water surfactant.
  • Figure 1 is a diagram of principle illustrating an embodiment of a device for implementing the method according to the invention.
  • the purpose of the process according to the invention is to allow easy installation of a bituminous mix comprising aggregates coated with bitumen, in particular relatively low temperature.
  • the water supply device 5 can include for example a reserve 5a of water added with surfactants, a water inlet 5b such as one or several spray bars or the like, and a pump variable flow 5c dosing machine which supplies the water supply 5b from the reserve 5a.
  • the surfactant can be mixed with water to a molar concentration of 0.1 to 1.5%, for example approximately 0.3%.
  • Water with surfactant can be added to bituminous mix in a mass ratio of water to the asphalt mix between 0.5 and 5%, this mass ratio being controlled by the dosing pump 5c which can be subject for example to the speed of the paver 1 and / or the amount of mix used.
  • Mixing in the mixer or other mixing can be relatively quick, for example between 10 seconds and 2 minutes.
  • This mixing can possibly be carried out by a worm of conveyor constituting both the conveyor and the mixer.
  • Said mixing could also be carried out by a transverse distribution screw similar to the screw distribution 8 above.
  • This mixture could also be performed not in finisher 1, but possibly in a device (not shown) which supplies asphalt paver 1 with asphalt.
  • this mixing is carried out immediately before spreading operations, i.e. immediately before passing through the distribution screw 8 and under the smoothing beam 9 (i.e. a few seconds at less than 10 minutes before these operations, for example), and advantageously at the place of implementation.

Abstract

The method involves adding water from a water reservoir (5) to a hot coated bituminous having coated bitumen granules, and mixing the water and the coated bituminous by a mixer (4). The water presents a molar concentration ranging between 0.1 to 1.5 percentages in an active surface. The bituminous mix in a liquid state, is spreaded on a reception surface (10) e.g. road. An independent claim is also included for a device for implementation of hot coated bituminous.

Description

La présente invention est relative aux procédés et dispositifs de mise en oeuvre à chaud d'enrobés bitumineux.The present invention relates to methods and devices for hot bituminous mixes.

Plus particulièrement, l'invention concerne un procédé de mise en oeuvre à chaud (c'est-à-dire à une température supérieure aux températures ambiantes communément rencontrées dans les pays tempérés) d'un enrobé bitumineux comprenant des granulats enrobés dans du bitume, ce procédé comprenant une étape d'épandage au cours de laquelle on épand ledit enrobé sur une surface de réception, par exemple une route ou similaire.More particularly, the invention relates to a hot implementation process (i.e. at a temperature higher than ambient temperatures commonly encountered in temperate countries) bituminous comprising aggregates coated in bitumen, this process comprising a step of spreading during which said asphalt is spread on a surface of reception, for example a road or the like.

Un enrobé bitumineux mis en oeuvre à chaud comprend toujours un squelette minéral enrobé par du bitume chaud. On essaie de maintenir sa température jusqu'à la fin de sa mise en oeuvre qui intervient généralement dans les deux heures qui suivent sa fabrication et son transport sur le lieu de la mise en oeuvre. Cette mise en oeuvre consiste à répandre le mélange sur la surface à revêtir en une couche d'épaisseur définie, régulière et homogène par exemple pour constituer une couche de chaussée (couche de roulement ou d'assise) ou d'ouvrage similaire. L'enrobé à chaud est généralement mis en oeuvre à l'aide d'un finisseur à enrobé qui assure toutes les fonctions mécaniques requises que l'on complète en phase finale par le passage sur la couche fraíchement étalée de compacteurs qui apportent la densification du mélange.A hot-mix bituminous mix includes always a mineral skeleton coated with hot bitumen. We try to maintain its temperature until the end of its implementation which generally occurs in both hours after its manufacture and transport on the place of implementation. This implementation consists of spread the mixture on the surface to be coated in one layer of defined thickness, regular and homogeneous for example for constitute a road surface (wearing course or seat) or similar work. The hot mix is generally implemented using an asphalt paver which provides all the required mechanical functions that it is completed in the final phase by passing over the layer freshly spread of compactors that provide densification of the mixture.

Au cours de ces différentes phases, il arrive que la température du mélange s'abaisse au delà de la limite permise pour assurer une mise en oeuvre satisfaisante. De plus, il peut être avantageux de fabriquer un enrobé à relativement basse température, par exemple comme décrit dans la demande de brevet français déposée le même jour que la présente demande de brevet, par le même déposant. During these different phases, it happens that the temperature of the mixture drops below the limit allowed to ensure satisfactory implementation. Of more, it may be advantageous to manufacture a mix with relatively low temperature, for example as described in the French patent application filed on the same day as the present patent application, by the same applicant.

L'invention a notamment pour but d'améliorer la maniabilité de l'enrobé bitumineux pour faciliter sa mise en oeuvre, en particulier dans les cas susmentionnés de mise en oeuvre à basse température (mais non exclusivement dans ces cas).The object of the invention is in particular to improve the workability of the bituminous mix to facilitate its installation implemented, in particular in the aforementioned cases of implementation used at low temperature (but not exclusively in these cases).

A cet effet, selon l'invention, un procédé du genre en question est caractérisé en ce qu'il comporte en outre, précédant immédiatement l'étape d'épandage, une étape d'addition d'eau au cours de laquelle on mélange de l'eau additionnée de tensioactif avec l'enrobé bitumineux.To this end, according to the invention, a method of the kind in question is characterized in that it further comprises, immediately preceding the spreading step, a step addition of water during which water is mixed added with surfactant with the bituminous mix.

Grâce à ces dispositions, on a pu constater que la maniabilité de l'enrobé est nettement améliorée de par la création d'une émulsion d'eau dans le bitume, de type émulsion d'eau dans huile, ce qui permet une répartition et un épandage plus faciles et un compactage satisfaisant même lorsque l'enrobé est à relativement basse température.Thanks to these provisions, it has been observed that the workability of the asphalt mix is significantly improved by the creation of a water emulsion in bitumen, of the type emulsion water in oil, which allows a distribution and easier spreading and satisfactory compaction even when the mix is at relatively low temperature.

Dans des modes de réalisation préférés de l'invention, on peut éventuellement avoir recours en outre à l'une et/ou à l'autre des dispositions suivantes :

  • l'eau additionnée de tensioactif présente une concentration molaire en tensioactif comprise entre 0,1% et 1,5% ;
  • au cours de l'étape d'addition d'eau, l'eau additionnée de tensioactif est ajoutée à l'enrobé bitumineux dans une proportion de 1% à 5% en masse par rapport à la masse d'enrobé bitumineux ;
  • l'eau additionnée de tensioactif est mélangée à l'enrobé bitumineux par malaxage ;
  • le bitume de l'enrobé bitumineux est dans un état fluide non mousseux lors des étapes d'addition d'eau et d'épandage ;
  • l'enrobé bitumineux est à une température comprise entre 60 et 100 °C lors des étapes d'addition d'eau et d'épandage ;
  • l'enrobé bitumineux est à une température comprise entre 100 et 130 °C, préférentiellement de l'ordre de 110 °C lors des étapes d'addition d'eau et d'épandage.
In preferred embodiments of the invention, it is possible optionally to have recourse to one and / or the other of the following arrangements:
  • the water added with surfactant has a molar concentration of surfactant of between 0.1% and 1.5%;
  • during the water addition step, the water added with surfactant is added to the bituminous mix in a proportion of 1% to 5% by mass relative to the mass of bituminous mix;
  • the water added with surfactant is mixed with the bituminous mix by mixing;
  • the bitumen of the bituminous mix is in a non-foaming fluid state during the steps of adding water and spreading;
  • the bituminous mix is at a temperature between 60 and 100 ° C during the steps of adding water and spreading;
  • the bituminous mix is at a temperature between 100 and 130 ° C, preferably around 110 ° C during the steps of adding water and spreading.

Par ailleurs, l'invention a également pour objet un dispositif pour la mise en oeuvre du procédé tel que défini ci-dessus, ce dispositif comprenant des moyens de mélangeage recevant de l'enrobé bitumineux et dotés d'au moins une arrivée d'eau alimentée en eau additionnée de tensioactif, et un dispositif d'étalement d'enrobé recevant l'enrobé depuis les moyens de mélangeage et adapté pour épandre l'enrobé bitumineux. Avantageusement, le dispositif est pourvu de moyens de dosage pour doser l'eau additionnée de tensioactif.Furthermore, the invention also relates to a device for implementing the method as defined above, this device comprising means for mixing receiving bituminous mix and provided with minus a water supply supplied with water added with surfactant, and a mix spreader receiving the mix from the mixing means and suitable for spread the bituminous mix. Advantageously, the device is provided with metering means for metering the added water surfactant.

D'autres caractéristiques et avantages de l'invention apparaítront au cours de la description suivante d'une de ses formes de réalisation, donnée à titre d'exemple non limitatif, en regard du dessin joint.Other features and benefits of the invention will appear during the description following of one of its embodiments, given as non-limiting example, with reference to the attached drawing.

Sur le dessin, la figure 1 est un schéma de principe illustrant une forme de réalisation d'un dispositif pour la mise en oeuvre du procédé selon l'invention.In the drawing, Figure 1 is a diagram of principle illustrating an embodiment of a device for implementing the method according to the invention.

Le procédé selon l'invention a pour but de permettre une mise en oeuvre aisée d'un enrobé bitumineux comprenant des granulats enrobés de bitume, notamment à relativement basse température.The purpose of the process according to the invention is to allow easy installation of a bituminous mix comprising aggregates coated with bitumen, in particular relatively low temperature.

Comme représenté sur le dessin, le procédé selon l'invention peut être mis en oeuvre par exemple par un finisseur 1 comprenant :

  • une trémie 2 de réception d'enrobé bitumineux chaud, par exemple à une température comprise entre 60 et 140 °C, par exemple entre 60 et 100 °C ou entre 100 et 130 °C, et préférentiellement de l'ordre de 110°C, cet enrobé pouvant être par exemple non mousseux,
  • un convoyeur 3 tel qu'un tapis transporteur qui transfère généralement l'enrobé bitumineux de la trémie de réception 2 vers l'arrière, c'est-à-dire dans la direction opposée à la direction d'avancement A du finisseur 1,
  • un malaxeur 4 ou autre dispositif de mélangeage qui reçoit l'enrobé bitumineux du convoyeur 3 et qui est doté d'un dispositif 5 d'alimentation en eau additionnée d'adjuvants, ces adjuvants comprenant au moins un tensioactif, le malaxeur étant adapté pour mélanger l'enrobé bitumineux avec l'eau additionnée de tensioactif et d'éventuels autres adjuvants,
  • un ensemble moteur 7 pour animer les parties mobiles du finisseur 1,
  • et des moyens d'épandage d'enrobé comprenant :
    • une ou plusieurs vis de répartition 8 permettant de répartir transversalement, sur toute la largeur d'épandage, l'enrobé 6 qui est déversé sur une surface de réception 10 en sortie du malaxeur ou autre dispositif de mélangeage 4,
    • une table flottante constituée d'une poutre lisseuse 9 équipée de vibreurs et/ou de dameurs, soit rigide, soit munie de parties extensibles permettant de faire varier la largeur d'épandage tout en maintenant l'état de surface et l'épaisseur de la couche répandue 11.
As shown in the drawing, the method according to the invention can be implemented for example by a finisher 1 comprising:
  • a hopper 2 for receiving hot bituminous mix, for example at a temperature between 60 and 140 ° C, for example between 60 and 100 ° C or between 100 and 130 ° C, and preferably of the order of 110 ° C , this coated material being for example non-sparkling,
  • a conveyor 3 such as a conveyor belt which generally transfers the bituminous mix from the receiving hopper 2 backwards, that is to say in the direction opposite to the direction of advance A of the finisher 1,
  • a kneader 4 or other mixing device which receives the bituminous mix from the conveyor 3 and which is provided with a device 5 for supplying water with additives, these adjuvants comprising at least one surfactant, the kneader being suitable for mixing bituminous mix with water added with surfactant and any other additives,
  • a motor assembly 7 for driving the moving parts of the finisher 1,
  • and asphalt spreading means comprising:
    • one or more distribution screws 8 making it possible to distribute transversely, over the entire spreading width, the mix 6 which is poured onto a receiving surface 10 at the outlet of the mixer or other mixing device 4,
    • a floating table consisting of a smoothing beam 9 fitted with vibrators and / or tampers, either rigid, or provided with extendable parts making it possible to vary the spreading width while maintaining the surface condition and the thickness of the widespread layer 11.

Le dispositif d'alimentation en eau 5 peut comprendre par exemple une réserve 5a d'eau additionnée de tensioactifs, une arrivée d'eau 5b telle qu'une ou plusieurs rampes d'aspersion ou similaires, et une pompe doseuse 5c à débit variable qui permet d'alimenter l'arrivée d'eau 5b à partir de la réserve 5a.The water supply device 5 can include for example a reserve 5a of water added with surfactants, a water inlet 5b such as one or several spray bars or the like, and a pump variable flow 5c dosing machine which supplies the water supply 5b from the reserve 5a.

A titre d'exemple non limitatif, on peut utiliser à titre de tensioactif le produit de marque « CECA L200 ».By way of nonlimiting example, one can use as a surfactant the brand product "CECA L200".

Le tensioactif peut être mélangé à l'eau à une concentration molaire de 0,1 à 1,5 %, par exemple environ 0,3 %.The surfactant can be mixed with water to a molar concentration of 0.1 to 1.5%, for example approximately 0.3%.

L'eau additionnée de tensioactif peut être ajoutée à l'enrobé bitumineux dans un rapport massique de l'eau à l'enrobé compris entre 0,5 et 5 %, ce rapport massique étant contrôlé par la pompe doseuse 5c qui peut être asservie par exemple à la vitesse d'avancement du finisseur 1 et/ou à la quantité d'enrobé mise en oeuvre.Water with surfactant can be added to bituminous mix in a mass ratio of water to the asphalt mix between 0.5 and 5%, this mass ratio being controlled by the dosing pump 5c which can be subject for example to the speed of the paver 1 and / or the amount of mix used.

Le mélange dans le malaxeur ou autre dispositif de mélangeage peut être relativement rapide, par exemple compris entre 10 secondes et 2 minutes. Ce malaxage peut éventuellement être effectué par une vis sans fin de convoyage constituant à la fois le convoyeur et le malaxeur. Ledit mélange pourrait également être effectué par une vis de répartition transversale similaire à la vis de répartition 8 susmentionnée. Ce mélange pourrait également être effectué non pas dans le finisseur 1, mais éventuellement dans un dispositif (non représenté) qui alimente le finisseur 1 en enrobé bitumineux.Mixing in the mixer or other mixing can be relatively quick, for example between 10 seconds and 2 minutes. This mixing can possibly be carried out by a worm of conveyor constituting both the conveyor and the mixer. Said mixing could also be carried out by a transverse distribution screw similar to the screw distribution 8 above. This mixture could also be performed not in finisher 1, but possibly in a device (not shown) which supplies asphalt paver 1 with asphalt.

Dans tous les cas, ce malaxage est effectué immédiatement avant les opérations d'épandage, c'est-à-dire immédiatement avant le passage dans la vis de répartition 8 et sous la poutre de lissage 9 (soit quelques secondes à moins de 10 minutes avant ces opérations, par exemple), et avantageusement sur le lieu même de mise en oeuvre.In all cases, this mixing is carried out immediately before spreading operations, i.e. immediately before passing through the distribution screw 8 and under the smoothing beam 9 (i.e. a few seconds at less than 10 minutes before these operations, for example), and advantageously at the place of implementation.

Claims (9)

Procédé de mise en oeuvre à chaud d'un enrobé bitumineux comprenant des granulats enrobés dans du bitume, ce procédé comprenant une étape d'épandage au cours de laquelle on épand ledit enrobé sur une surface de réception,
caractérisé en ce qu'il comporte en outre, précédant immédiatement l'étape d'épandage, une étape d'addition d'eau au cours de laquelle on mélange de l'eau additionnée de tensioactif avec l'enrobé bitumineux.Process for hot processing a bituminous mix comprising aggregates coated with bitumen, this process comprising a spreading step during which said mix is spread on a receiving surface,
characterized in that it further comprises, immediately preceding the spreading step, a step of adding water during which water mixed with surfactant is mixed with the bituminous mix. Procédé selon la revendication 1, dans lequel l'eau additionnée de tensioactif présente une concentration molaire en tensioactif comprise entre 0,1% et 1,5%.The method of claim 1, wherein water with surfactant has a concentration molar surfactant between 0.1% and 1.5%. Procédé selon la revendication 1 ou la revendication 2, dans lequel au cours de l'étape d'addition d'eau, l'eau additionnée de tensioactif est ajoutée à l'enrobé bitumineux dans une proportion de 1% à 5% en masse par rapport à la masse d'enrobé bitumineux.Method according to claim 1 or the claim 2, wherein during the adding step of water, the water added with surfactant is added to bituminous mix in a proportion of 1% to 5% by mass relative to the mass of bituminous mix. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'eau additionnée de tensioactif est mélangée à l'enrobé bitumineux par malaxage.Method according to any one of previous claims, wherein the added water of surfactant is mixed with the bituminous mix by mixing. Procédé selon l'une quelconque des revendications précédentes, dans lequel le bitume de l'enrobé bitumineux est dans un état fluide non mousseux lors des étapes d'addition d'eau et d'épandage.Method according to any one of previous claims, wherein the bitumen of the bituminous mix is in a non-foamy fluid state during the water addition and spreading steps. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'enrobé bitumineux est à une température comprise entre 60 et 100 °C lors des étapes d'addition d'eau et d'épandage.Method according to any one of previous claims, wherein the bituminous mix is at a temperature between 60 and 100 ° C during water addition and spreading steps. Procédé selon l'une quelconque des revendications 1 à 5, dans lequel l'enrobé bitumineux est à une température comprise entre 100 et 130 °C, préférentiellement de l'ordre de 110 °C lors des étapes d'addition d'eau et d'épandage.Method according to any one of Claims 1 to 5, in which the bituminous mix is to a temperature between 100 and 130 ° C, preferably around 110 ° C during the stages addition of water and spreading. Dispositif pour la mise en oeuvre d'un procédé selon l'une quelconque des revendications précédentes, ce dispositif comprenant des moyens de mélangeage (4) recevant de l'enrobé bitumineux et dotés d'au moins une arrivée d'eau (5b) alimentée en eau additionnée de tensioactif, et un dispositif d'étalement d'enrobé (8, 9) recevant l'enrobé depuis les moyens de mélangeage (4) et adapté pour épandre l'enrobé bitumineux.Device for implementing a method according to any one of the preceding claims, this device comprising mixing means (4) receiving bituminous mix and provided with at least one inlet water (5b) supplied with water added with surfactant, and an asphalt spreader (8, 9) receiving the asphalt from the mixing means (4) and adapted to spread bituminous mix. Dispositif selon la revendication 8, comprenant le dispositif des moyens de dosage (5c) pour doser l'eau additionnée de tensioactif.Device according to claim 8, comprising the metering means device (5c) for metering the water added with surfactant.
EP04290978A 2003-04-18 2004-04-13 Method and device for heat processing bitumen-coated material Expired - Lifetime EP1469127B1 (en)

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FR0304875A FR2853918B1 (en) 2003-04-18 2003-04-18 METHOD AND DEVICE FOR HOT IMPLEMENTATION OF A BITUMINOUS SPRAY
FR0304875 2003-04-18

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ES (1) ES2308124T3 (en)
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EP1469127B1 (en) 2008-05-28
FR2853918B1 (en) 2005-06-24
US7114875B2 (en) 2006-10-03
ES2308124T3 (en) 2008-12-01
FR2853918A1 (en) 2004-10-22
ATE397127T1 (en) 2008-06-15
DE602004014059D1 (en) 2008-07-10
US20040223808A1 (en) 2004-11-11
PT1469127E (en) 2008-09-04

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