EP2685001A1 - Surface for roadways and method for its preparation - Google Patents

Abstract

The method involves applying a high void asphalt base course (3) to a supporting structure (2). The application of a high void asphalt base course is applied on a concrete structure. A reaction resin mixture (4) is applied to the cavity-rich asphalt base course. An adhesive (5) is applied to the cavity-rich asphalt base course. The adhesive is a solid at room temperature thermoplastic. A cover layer (6) is applied based on bitumen. An independent claim is included for a carriageway structuring.

Description

Technical area

The invention relates to the field of roadway sealing on a support structure.

State of the art

On a support structure, in particular on a concrete support structure, applied roadways are often encountered, especially as bridges. Such concrete support structures can be sealed by void-rich Asphalttragschichten, which are cast with reactive resin mixtures. As the topmost layer, a bitumen-based top layer is usually applied in road construction. However, this poses the problem that there must be a good bond between the cover layer and the material of the supporting structure, in particular the concrete, which of course includes the adhesion of all intermediate layers. In particular, the adhesion between the void-rich asphalt base layer coated with reactive resin mixture and the bituminous top layer constitutes a difficult problem to solve because of the materials involved. When applying the reaction resin mixture to the void-rich asphalt base layer, areas form where the reaction resin mixture has larger contiguous areas forming on the top of the asphalt base course, typically optically smooth areas of the reaction resin mixture, this is disadvantageous for a good bond. These areas lead to a poor bond between the cast hollow-rich asphalt base course and the bituminous top layer.

Presentation of the invention

The object of the present invention is therefore to provide a roadway structure, which can be created easily and efficiently and leads to a good bond between the potted hollow-rich asphalt base course and the bituminous top layer, especially at locations where the reaction resin mixture forms larger contiguous areas on top of the asphalt base course.

Surprisingly, it has been found that with a method according to claim 1, a roadway structure according to claim 11 and a use of an adhesive according to claim 12 this problem can be solved. This method further makes it possible to seal a roadway on a support structure, in particular on a concrete support structure, in a quick and cost-efficient manner.

Further aspects of the invention are the subject of further independent claims. Particularly preferred embodiments of the invention are the subject of the dependent claims.

Ways to carry out the invention

• (i) Aufbringen einer hohlraumreichen Asphalttragschicht 3 auf eine Tragstruktur 2, insbesondere Aufbringen einer hohlraumreichen Asphalttragschicht 3 auf eine Betonstruktur 2;
• (ii) Aufbringen eines Reaktionsharzgemisches 4 auf die hohlraumreiche Asphalttragschicht 3 aus Schritt (i);
• (iii) Aufbringen eines Haftmittels 5 auf die hohlraumreiche Asphalttragschicht 3 aus Schritt (i), wobei es sich bei dem Haftmittel um einen bei Raumtemperatur festen Thermoplast handelt;
• (iv) Aufbringen einer Deckschicht 6 auf Bitumenbasis.

The present invention relates in a first aspect to a method for producing a roadway structure 1 comprising the steps

• (i) applying a cavity-rich asphalt carrier layer 3 to a carrier structure 2, in particular applying a cavity-rich asphalt carrier layer 3 to a concrete structure 2;
• (ii) applying a reaction resin mixture 4 to the void-rich asphalt base course 3 of step (i);
• (iii) applying an adhesive 5 to the void-rich asphalt base layer 3 of step (i), wherein the adhesive is a thermoplastic solid at room temperature;
• (iv) applying a bitumen-based topcoat 6.

In a first step (i), a cavity-rich asphalt carrying layer 3 is applied to a supporting structure 2, in particular a concrete structure.

Such a support structure 2 is preferably a building of civil engineering. In particular, this may be a bridge, a gallery, a tunnel, a ramp or departure ramp or a parking deck. A preferred example of such a support structure is a bridge. This necessary for the roadway support structure is a structure of a material which a can have supporting function. In particular, this material is a metal or a metal alloy or a concrete, in particular a reinforced concrete, preferably a reinforced concrete. The most preferred example of such a support structure is a concrete bridge.

The void-rich asphalt base course 3 preferably consists of a single-grained asphalt with a high pore volume, for example asphalts of the classes 0/16, 0/11 or 0/5 can be used.

The void-rich asphalt base course preferably has a binder content of 4.5-7.5% by weight.

The void-rich asphalt base course preferably has spherical or polyhedron-shaped pores, which are delimited by webs and form a coherent system. In the present document, "pores" are understood as meaning production-related cavities in and / or on the surface of a composition that are filled with air or other substances that are foreign to the composition. The pores may be visible or unrecognizable to the naked eye. Preferably, they are open pores which communicate with the surrounding medium.

It is further advantageous that the void-rich asphalt base layer has a pore size of 0.1-5 mm, in particular 0.2-1 mm, and / or a pore volume of 5-90%, in particular 10-80%, preferably 20-40%. Pore volume in the present document is understood to mean the proportion in percent of the total of the voids filled with air or other non-compositional substances in the volume of the foamed composition. Preferably, the thickness of the void-rich asphalt base course is 1 - 5 cm. It may also be advantageous if the void content of the cavity-rich asphalt base course, measured in the Marshall body at 120 ° C., is between 15 and 30% by volume.

In a further step (ii), a reaction resin mixture 4 is applied to the high-lumen asphalt carrying layer 3 from step (i). Preferably, the application of the reaction resin mixture during the cavity-rich Asphalttragschicht 3 a temperature of 30 ° C - 60 ° C, in particular 30 ° C - 40 ° C having.

Preferably, during application, the reactive resin mixture penetrates into the cavity-rich asphalt base layer 3 and leads to a seal, in particular to water, the cavity-rich asphalt base course 3 and to an adhesive bond of the cavity-rich asphalt base course 3 to the base structure 2 by the later curing of the reaction resin mixture.

The reaction resin mixture has a flowable consistency at room temperature and is typically applied by brushing, spraying or pouring onto the void-rich asphalt base course layer 3. It should be noted that the term "flowable" here will refer not only to liquid, but also to higher viscosity honey-like to pasty materials whose shape is adjusted under the influence of gravity.

In particular, these are two-component epoxy resin compositions, in particular those whose one (ie first) component contains an epoxy resin, in particular an epoxy resin based on bisphenol A diglycidyl ether, and the other (ie second) component of a curing agent, in particular a polyamine or a polymercaptan , contains. Particularly preferred are epoxy resin compositions which have no fillers. Further advantageously, the epoxy resin resin compositions are highly fluid, in particular having a viscosity of less than 10'000 mPas, preferably between 10 and 1000 mPas, so that they can penetrate into the cavity-rich asphalt base course and possibly into the support structure 2. Particularly preferred as two-component epoxy resin compositions are thin, two-component epoxy resin compositions, such as those sold under the trade name Sikafloor®, Sikagard® or Sika Ergodur® Sika Germany GmbH, or Sika Switzerland AG.

Particularly preferred as two-component epoxy resin compositions are flexibilized two-component epoxy resin compositions. This is advantageous in that the Reaction resin mixture can perform its Abichtungs- and composite function even under high mechanical loads.

In a further step (iii), an adhesive 5 is applied to the hollow-rich asphalt base course 3 from step (i).

The application is preferably carried out by sprinkling the adhesive in the form of pellets.

Preferably, the adhesive is applied in such a way that 0.5- 1.5 kg / m ³ , in particular 0.8-1.2 kg / m ³ , of adhesive are applied to the surface of the hollow-rich asphalt base course.

The adhesive is a solid at room temperature thermoplastic. The term "room temperature" is understood to mean a temperature of 23 ° C. The adhesive preferably has a melting point above 70 ° C, in particular between 100 ° C and 180 ° C, preferably between 110 ° C and 140 ° C. Any melting point of polymers in this document is understood as softening points (softening point) measured by the Ring & Ball method according to DIN ISO 4625.

The adhesive comprises in particular polyolefins, in particular polyolefins, which can be prepared from the polymerization of ethylene with one or more unsaturated monomers. Particular examples of such unsaturated monomers are those monomers which are selected from the group consisting of propylene, butylene, butadiene, vinyl esters, in particular vinyl acetate, maleic anhydride, acrylic acid, methacrylic acid, acrylic esters and methacrylates.

Particularly preferred are polyolefins prepared from the polymerization of ethylene with one or more unsaturated monomers selected from the group consisting of vinyl esters, in particular vinyl acetate, maleic anhydride, acrylic acid, methacrylic acid, acrylic acid esters and methacrylic acid esters. Preference is given to polyolefins which have a melting point of more than 60.degree. C., in particular between 70.degree. C. and 130.degree.

It may also be advantageous to use a mixture of the aforementioned polyolefins. Preferably, the proportion of polyolefins 15- 60 wt .-%, in particular 20- 40 wt .-%, based on the total weight of the adhesive.

Further, it may be advantageous if the adhesive comprises a chemical blowing agent and / or a physical blowing agent. Chemical blowing agents are preferably organic or inorganic compounds which decompose under the influence of temperature, wherein at least one of the decomposition products is a gas. As physical blowing agents, it is possible, for example, to use compounds which, on increasing the temperature, change into the gaseous state of aggregation. Preferably, the adhesive comprises a chemical blowing agent.

Further, it may be advantageous if the adhesive has an epoxy solid resin. The proportion of the solid epoxy resin is preferably 1-10% by weight, in particular 2-5% by weight, based on the total weight of the adhesive.

Further, it may be advantageous if the adhesive comprises at least one resin. This may be a natural resin or a synthetic resin. In particular, such resins are medium to high molecular weight compounds from the classes of paraffin, hydrocarbon resins, polyolefins, polyesters, polyethers, polyacrylates or amino resins. The resin preferably has a melting point or softening point between 60 ° C and 140 ° C. In a preferred embodiment, the resin is a hydrocarbon resin, especially an aliphatic hydrocarbon resin. Preferably, they are resins with an average molecular weight of 1000 - 3000 g / mol. The proportion of the resins is preferably 2-15% by weight, in particular 5-12% by weight, based on the total weight of the adhesive.

Particularly preferred adhesives are adhesives such as those sold under the trade name Sikalastic®-827 LT and Sikalastic®-827 HT by Sika Schweiz AG.

Preferably, in a further step (v), an inorganic litter 7 is applied to the hollow-rich asphalt base course 3 from step (i). Preferably, this step is subsequently carried out at step (ii). Preferably, this step is carried out before step (iii) or before step (iv), in particular before step (iii).

The inorganic bedding agent 7 is in particular sand, preferably quartz sand. In order to ensure a good bond between the bedding agent and the reaction resin mixture, it is advantageous if this bedding agent is sprinkled in before the reaction resin mixture hardens.

It is preferred if this inorganic bedding agent has a maximum particle size of less than 1 mm, in particular between 0.1 and 1 mm, preferably between 0.3 and 0.8 mm.

However, the amount of such litter is preferably such that the surface of the void-rich asphalt base course is not completely covered.

However, it can also be advantageous if the method does not have a step (v) with an application of an inorganic litter 7 to the hollow-rich asphalt base course 3 from step (i). Among other things, this is advantageous in that it results in an increase in the bond strength, in particular the breaking load and the adhesive tensile strength, between the cavity-rich asphalt base layer cast with a reaction resin mixture and a bitumen-based top layer.

In a further step (iv), a covering layer 6 based on bitumen is applied.

This cover layer 6 represents the roadway which is in direct contact with vehicles. The bitumen-based topcoat is heated prior to application to a temperature of typically 140 ° C to 160 ° C and preferably rolled by means of a roll. The application of the cover layer is well known to the person skilled in the art and will therefore not be discussed further here. In addition to bitumen, the cover layer may have the other possible components known to those skilled in the art. The person skilled in the art knows the nature and quantity of the constituents of bitumen-based compositions which are used for the construction of roadways. Particularly important here is the fact that the top layer usually to a significant extent mineral fillers, especially sand or grit have.

When contacting the molten bitumen with the adhesive 5, the adhesive 5 melts depending on its melting point or on. If it melts, this can-depending on the nature of the thermoplastics-form a substantially homogeneous adhesive layer or also dissolve in the bitumen near the surface and form an adhesive-containing boundary phase layer. Thus, it is well within the spirit of the present invention that the adhesive need not form an individual layer. If the adhesive contains a blowing agent, contacting the molten bitumen preferably leads to activation of the blowing agent.

The roadway construction thus produced has the significant advantage that a good bond, in particular with regard to breaking load and adhesive tensile strength, is ensured between the cavity-rich asphalt base course layer cast with a reaction resin mixture and the bitumen-based top layer.

In a further aspect, the invention relates to a roadway structure according to the method described above.

• Figur 1 zeigt ein mögliches Resultat der Schritte (i) und (ii). Das aufgebrachte Reaktionsharzgemisch 4 befindet sich grösstenteils in den Hohlräumen der Asphalttragschicht 3. Auf der Oberfläche der Asphalttragschicht ist ein zusammenhängender Bereich aus Reaktionsharzgemisch sichtbar, welcher nach dem Aushärten des Reaktionsharzgemisches zu einem optisch glatten Bereich auf der Asphalttragschicht führen kann.
• Figur 2 zeigt ein mögliches Resultat der Schritte (i) und (ii) wie vorgehend in Figur 1 beschreiben, wobei hier zusätzlich der Schritt (v) ausgeführt wurde.
• Figur 3 zeigt ein mögliches Resultat der Schritte (i), (ii), (iii) und (iv). Das aufgebrachte Haftmittel 5 führt zu einem verbesserten Haftverbund der Asphalttragschicht 3 mit der Deckschicht 6.
• Figur 4 zeigt ein mögliches Resultat der Schritte in der Reihenfolge (i), (v), (ii) (iii) und (iv). Das aufgebrachte Haftmittel 5 führt zu einem verbesserten Haftverbund der Asphalttragschicht 3 mit der Deckschicht 6.

In a further aspect, the invention relates to the use of an adhesive as described above for increasing the adhesion, in particular the breaking load and the adhesive tensile strength, between a cavity-rich asphalt base layer cast on a reaction resin mixture on a support structure and a bitumen-based top layer. The constituents required for this purpose, in particular the adhesive, support structure, reaction resin mixture, asphalt base layer and bitumen-based top layer, have already been described in detail above.

• FIG. 1 shows a possible result of steps (i) and (ii). The applied reaction resin mixture 4 is mostly located in the cavities of the asphalt base layer 3. On the surface of the asphalt base layer a contiguous area of reactive resin mixture is visible, which after curing of the reaction resin mixture can lead to an optically smooth area on the asphalt base layer.
• FIG. 2 shows a possible result of steps (i) and (ii) as described in FIG. 1 describe, in which case additionally step (v) was performed.
• FIG. 3 shows a possible result of steps (i), (ii), (iii) and (iv). The applied adhesive 5 leads to an improved adhesive bond of the asphalt base layer 3 with the cover layer 6.
• FIG. 4 shows a possible result of the steps in the order (i), (v), (ii) (iii) and (iv). The applied adhesive 5 leads to an improved adhesive bond of the asphalt base layer 3 with the cover layer 6.

LIST OF REFERENCE NUMBERS

1

road construction

2

Support structure, concrete support structure

3

cavity-rich asphalt base course

4

Reactive resin mixture

5

adhesives

6

Cover layer based on bitumen

7

Inorganic litter

8th

contiguous areas of reaction resin mixture on top of the asphalt base course

Examples

• Reaction resin mixture (RH): STATIFLEX®-EP (Strabag).
• Adhesive (HM): Sikalastic®-827 LT (in the form of pellets with a size of approx. 2 mm)

On concrete slabs with an area of 4400 cm ² a hollow-rich asphalt base layer STATIFLEX® (Strabag) (void content 25-30% by volume) with a thickness of approx. 2 cm was applied, after which the still hot asphalt base course (30 - 40 ° C) filled with the aforementioned reaction resin mixture (RH).

For the concrete slabs of Example 1, quartz sand 2/5 mm was subsequently applied. Thirty-six hours later, a bitumen-based topping was applied to the surface of the asphalt base course comprising the quartz sand.

In the case of the concrete slabs of Ex.2, about 1 kg / m 3 of the above-mentioned adhesive (HM) was then applied uniformly. Thirty-six hours later, a bitumen-based topcoat was applied to the surface of the asphalt base course comprising the adhesive.

For the concrete slabs of example 3, quartz sand 2/5 mm was subsequently applied. Subsequently, about 1 kg / m3 of the aforementioned adhesive (HM) was uniformly applied. 36 hours later, a bitumen-based topcoat was applied to the surface of the asphalt base course comprising the silica sand and the adhesive.

Drill cores d = 100mm were taken and adhesion tests were carried out. The measured values listed in Table 1 correspond to the mean value of 3 measured values. Table 1, Measured Values Breaking load [KN] Adhesive tensile strength [N / mm ² ] fracture pattern Ex.1 0.9 0.21 Break between asphalt base course and top layer Ex.2 2.7 0.61 Break in top layer EX3 2.5 0.57 Break in top layer

Claims (12)

Method for producing a roadway structure (1) comprising the steps (I) applying a cavity-rich Asphalttragschicht (3) on a support structure (2), in particular applying a cavity-rich Asphalttragschicht (3) on a concrete structure (2); (ii) applying a reactive resin mixture (4) to the void-rich asphalt base course (3) of step (i); (iii) applying an adhesive (5) to the void-rich asphalt base (3) of step (i), wherein the adhesive is a thermoplastic solid at room temperature; (iv) applying a bitumen-based topcoat (6). A method according to claim 1, characterized in that the method further comprises a step (v) applying an inorganic litter (7) to the void-rich asphalt base course (3) of step (i), this step preferably being carried out subsequently to step (ii). Method according to one of the preceding claims, characterized in that the void-rich asphalt base layer (3) has a pore volume of 5 - 90%, in particular 10 - 80%, preferably 20 - 40%. Method according to one of the preceding claims, characterized in that it is the reaction resin mixture (4) is a two-component epoxy resin resin compositions. Method according to one of the preceding claims, characterized in that the adhesive (5) polyolefins, prepared from the polymerization of ethylene with one or more unsaturated monomers selected from the group consisting of vinyl ester, in particular vinyl acetate, maleic anhydride, acrylic acid, methacrylic acid, acrylic esters and methacrylic acid esters. A method according to claim 5, characterized in that the polyolefins have a melting point of about 60 ° C, in particular between 70 ° C and 130 ° C. Method according to one of claims 5 or 6, characterized in that the proportion of polyolefins 15- 60 wt .-%, in particular 20- 40 wt .-%, based on the total weight of the adhesive (5). Method according to one of the preceding claims, characterized in that the adhesive (5) comprises a chemical blowing agent. Method according to one of the preceding claims, characterized in that the adhesive (5) comprises a solid epoxy resin. Method according to one of the preceding claims, characterized in that the adhesive (5) comprises at least one hydrocarbon resin. Roadway structure (1) produced by a method according to one of the preceding claims. Use of an adhesive, as described as adhesive (5) in the process according to any one of claims 1-10, for increasing the adhesion, in particular the breaking load and the adhesive tensile strength, between a cavity-rich asphalt base layer cast with a reaction resin mixture on a support structure and a cover layer bitumen.

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