EP2393984B1 - Self-compacting mastic asphalt mixture, for pavement coating layers, asphalt intermediate layers, asphalt binder layers, and/or asphalt compression layers - Google Patents

Description

The invention relates to a self-compacting mastic asphalt mixture, for road surface layers, asphalt intermediate layers, Asphaltbinderschichten and / or Asphaltdichtungsschichten in road construction with the features of the preamble of claim 1. The invention is also a road surface layer, asphalt intermediate layer, Asphaltbinder layer and / or Asphaltdichtungsschicht with the features of the preamble of claim 8. The invention further provides a process for the production of a roadway covering layer from an asphalt mixture according to the invention with the features of the preamble of claim 9.

General information for the production of road surface layers, intermediate asphalt layers, asphalt binder layers and / or bituminous asphalt layers from bituminous mixtures results from the Plant "Technical delivery conditions for bituminous mixtures for the construction of traffic surface pavements" (TL Asphalt-StB 07, version 2008 ). Classifications for grain sizes from rock to rock flour (filler) result from the Plant "Technical delivery conditions for aggregates in road construction" (TL Gestein-StB 04, version 2007 ). This also includes the designation for the different rock classes.

Road surface layers, intermediate layers, binder layers and / or asphalt sealing layers are distinguished according to two installation methods, rolled asphalt and mastic asphalt.

Rolled asphalt is named after the fact that it has to be compacted after installation and precompression mainly by the use of heavy rollers, with or without vibration. Mastic asphalt can, on the other hand, be poured out, distributed and installed in a final position by means of a built-in device (mastic asphalt paver or paver), ie it does not have to be compacted. Due to its installation characteristics, mastic asphalt is already such that compacting due to the use of heavy rollers is not required.

In rolled asphalt, the mix already contains the aggregates (grit and sand) for the expression of a textured, splinter-rich and thus gripped road surface of the road surface course. Rolled asphalt, however, must be compacted to the required degree of compaction by the use of heavy rollers. The imperfect compaction of rolled asphalt after its installation is a major cause of damage to pavement overlays. It happens again and again that due to unfavorable installation conditions installation errors, eg. B. Minderverdichtungen occur.

The built-in technical defects of rolled asphalt speak for mastic asphalt for the production of road surface layers, intermediate layers, binder courses and / or sealing layers, in particular in road construction. Fahtbahndeckschichten, interlayers, binder layers and / or sealing layers are all types of cover, intermediate, binder and sealing layers in road and road construction even where the respective layers are not used in the strict sense. It is also about all types of other surfaces, including bridges and tunnels.

Gussasphatt is a mixture of grit, sand, filler and binder. The filler is made of small-grained stone powder <0.063 mm (TL Gestein-StB 04, version 2007), the binder is usually bitumen. This mixture is composed so that it can be poured and brushed during installation and so also applies as mastic asphalt screed application. After installation and smoothing of the poured asphalt layer, no further compaction is required.

It makes sense in road construction, depending on the surface properties of mixtures, especially mineral mixtures, generally aggregate mixtures, the class 0/8 (with a maximum particle size of 8 mm) or 0/5 (with a maximum particle size of 5 mm) or 0/3 (with a Largest grain size of 3 mm). These mixtures apply in particular to noise-optimized road surface layers. The particle size is important for the surface properties, the grip and the rolling properties and noise of the road surface It plays a subordinate role for the stability, because this is primarily determined by the mortar, in particular consisting of sand, filler and binder.

Due to its good installation and flow properties, a road surface layer of mastic asphalt mix would have a closed, smooth surface without further processing. This would not be suitable for driving. As a road surface this must therefore be provided with grit. To increase the roughness of the surface and the Grip takes place in the usual mastic asphalt so regularly a scattering with grit or sand, which must be incorporated into the surface.

The application of chippings sets in rolled mastic asphalt the steps of heating, wrapping with bitumen, transport and storage on the site, spreading a defined amount (12-15 kg / sq m), kneading with a rubber wheel roller, rolling with a smoothing roller, sweeping, picking and Carry away the excess Abstreüsplitts advance. This procedure also results in risks for grip, noise and ride comfort. If the mastic asphalt mix has too much mortar on the surface, then the chippings sink. With too little mortar on the surface of the subsequently applied Abstreusplitt not liable. Optionally, too rough surfaces result due to different installation thicknesses and too low installation temperatures or even by unfavorable use of rollers.

However, mastic asphalt is the most economical and long-lasting pavement of asphalt for heavily used traffic areas. The imperviousness of mastic asphalt protects the bitumen from oxidation and subsequent embrittlement and prevents water from penetrating the road structure.

More recently, mastic asphalt mixtures have also been processed in a modified process into road surface layers. This improved mastic asphalt is processed with 10 to 13 kg / m² of grit (coarse aggregate) with special properties in terms of grain size and grain shape. This wastes but is not rolled. However, the installation of this type of mastic asphalt mix is very difficult because all installation parameters, ie installation temperature, no precipitation on the day before installation, correct temperature of the hot spalling must be complied with.

• Splittgehalt (grobe Gesteinskörnung > 2 mm) zwischen 35 M.-% und 55 M.-%,
• Sandgehalt (Natur- und/oder Brechsand; Körnung > 0,063 mm,≤ 2 mm) zwischen 25 M.-% und 45 M.-%,
• Füllergehalt (feine Gesteinskörnung ≤ 0,063 mm) zwischen 20 M.-% und 32 M.- %, so dass sich für die Gesteinskörnungsmischung eine Gesamtmasse von 100 M.-% ergibt, sowie
• Bindemittelgehalt zwischen 6,8 M.-% und 8,5 M.-%.

The standard "Technical delivery conditions for bituminous mixtures for the construction of traffic surface pavements" (TL Asphalt-StB 07) mentions and approves the following as the usual recipe for mastic asphalt mixtures (% by mass is the percentage of the mass of the constituent in the total mass of the sample or mixture this definition applies to the subject matter of claim 1 of this invention, but for the needs of the definition of the total mass of the mixture according to the cited prior art according to TL Asphalt-StB 07 as well as the mixture of the embodiment of this invention given below one such excluding the binder content is understood):

• Gravel content (coarse aggregate> 2 mm) between 35 and 55% by mass,
• Sand content (natural and / or crushed sand, grain size> 0.063 mm, ≤ 2 mm) between 25% by mass and 45% by mass,
• Filler content (fine aggregate ≤ 0.063 mm) between 20 and 32% by mass, giving a total mass of 100% by mass for the aggregate mixture, and
• Binder content between 6.8% by mass and 8.5% by mass.

FR 2,050,761 discloses a composition for producing a traffic surface comprising chippings, a binder, a filler and an elastomer. In particular, this document discloses a Gußasphaltmischung. The elastomer may be present in an amount of from 10 to 30% of the weight of the binder, with the binder preferably being bitumen. Good results have been obtained with a composition comprising about 55 to about 60 weight percent split, about 6.5 to 8 weight percent binder, and about 20 to 27 weight percent filler. The composition advantageously comprises about 10 to about 20% by weight of sand, for example those having a grain size of about 0 to about 6 mm. The grit has sizes between about 5 to 8 mm, and the grain size of the filler, which may be a limestone meal, for example, should be below 80 μ. An exemplary composition comprises 56 to 58 wt .-% grit with grain sizes from 5 to 8 mm, 7 to 8 wt .-% bitumen 40/50, 1 to 2 wt .-% polypropylene elastomer, 24 wt .-% limestone powder with a sieving of 80 μ and 20 wt .-% sand with a grain size of 0 to 6 mm.

For the purposes of the present invention, "chippings" are understood to mean a coarse aggregate of as a rule> 2 mm, and by sand a fine aggregate of aggregate in a range of> 0.063 mm and <2 mm. In this case, chippings may also be present in mixtures with an aggregate in the range of> 1 mm and ≤ 2 mm. Such inventively usable mixtures can therefore z. B. have an aggregate in the range> 1 mm and ≤ 3 mm. The grit and / or sand in the context of the present invention may be formed not only of rock, but also of substitutes such. B. rubber granulate, for example, from processed car tires. Nonetheless, in the present invention, the granulation ranges are consistently referred to as aggregates, even though they include substitutes such as rubber granules with corresponding grain sizes.

In many cases, a small proportion of natural asphalt is added. In addition, additives and / or additives are used to varying degrees, partly to change the viscosity of the bitumen so that processing can be carried out at slightly lower installation temperatures.

While rolled asphalt can be transported to the job site with normal trucks, the transport of hot cast asphalt to the site requires the use of special cast-aseptic agitator boilers. These are specially equipped lorries, in their transport container, the mastic asphalt mix is constantly stirred and kept at its optimum temperature, in particular slightly higher than the installation temperature. Thus, the transport of mastic asphalt mix is more expensive than that of rolled asphalt mix.

The invention is now based on the problem of specifying a self-compacting asphalt mix for road surface layers, asphalt interlayers, Asphaltbinderschichten and / or asphalt sealant layers, which works without the costly scattering with grit in a second operation during installation and still good Properties with regard to evenness, noise reduction and grip. A corresponding road surface layer, asphalt interlayer, asphalt binder layer and / or asphalt sealing layer is likewise an object of the invention. The process for producing such a road surface layer, asphalt interlayer, asphalt binder layer and / or asphalt sealing layer should also be improved. Finally, the transport of such an asphalt mixture for road surface layers, intermediate asphalt layers, asphalt binder layers and / or asphalt sealing layers should also be optimized compared to the prior art.

• Splittgehalt mit einer Gesteinskörnung > 1 mm, bevorzugt > 2 mm, zwischen 65 M.-% und 80 M.-%, bevorzugt zwischen 65 M.-% und 75 M.-%,
• Sandgehalt an Natur- und/oder Brechsand mit einer Körnung in einem Bereich > 0,063 mm und ≤ 2 mm, bevorzugt ≤1 mm, zwischen 2 M.-% und 15 M.-%, bevorzugt zwischen 6 M.-% und 12 M.-%,
• Füllergehalt mit einer Gesteinskörnung ≤ 0,063 mm zwischen 15 M.-% und 20 M-% beverzugt zwichen 15 M.-% und .-%, weiter beverzugt zwischen 15 M.-% und 19,5 M.-%
• Bindemittetgehatt zwischen 6,8 M.-% und 7,5 M.-%.

The above-mentioned problem is solved in a self-compacting mastic asphalt mix, with the features of the preamble of claim 1 by the features of the characterizing part of claim 1. The asphalt mixture according to the invention thus has the following composition:

• Gravel content with an aggregate> 1 mm, preferably> 2 mm, between 65 and 80% by mass, preferably between 65 and 75% by mass,
• Sand content of natural and / or crushed sand with a grain size in a range> 0.063 mm and ≤ 2 mm, preferably ≤1 mm, between 2 M .-% and 15 M .-%, preferably between 6 M .-% and 12 M .-%,
• Filler content with an aggregate size ≤ 0.063 mm between 15 and 20% by weight, between 15% and 15% by weight, further between 15% and 19.5% by weight
• Binder content between 6.8% by mass and 7.5% by mass.

Essential to the invention is therefore an altered composition of the bituminous mixture in comparison with the previously given, previously customary values. Essential for the bituminous mixture according to the invention is a very binder-rich, fine-grained mortar (as a mortar is called a mixture of binder, filler and sand). The asphalt mixture according to the invention can be used for the production of road surface layers, which is the main use, asphalt interlayers, Asphaltbinderschichten and / or Asphaltdichtungsschichten, especially in road construction, in particular as sealing layers under open-pored asphalt or other hollow-rich cover layers, but also in the binder area of roads as asphalt interlayer or Asphaltbinderschicht due to its high stability, or as asphalt sealing layer.

Also in the bituminous mixture according to the invention is preferably the class 0/8 (with a maximum grain size of 8 mm) or 0/5 (with a maximum grain size of 5 mm) can be realized. But also the use of smaller largest grains, z. B. 3 mm or 4 mm, or larger largest grains, z. B. 11 mm or 16 mm, d. H. in particular, such with a largest grain in a range of ≥ 2 mm to ≤ 16 mm, is possible.

According to a particularly preferred teaching of the invention it is provided that the Sändgehalt of natural and / or crushed sand having a particle size ≤ 2 mm, preferably <1 mm, more preferably> 0.063 mm and ≤ 1 mm, between 6 M .-% and 12 M .-% lies. This is a particularly preferred classification, which contributes to the optimization of the bituminous mixture according to the invention. Even more preferably, a sand with an aggregate in a range of ≥ 1 mm or <2 mm is present only to a small extent in the asphalt mixture, preferably in a range of 0.1% by mass to 3% by mass, this amount is comprised of the total sand content in a range of 2% to 15% by mass, preferably 6% to 12% by mass.

Preferably, the sand content will consist predominantly of natural sand, possibly also natural sand in the form of quartz sand. Crushed sand, in particular from oversize grain of the filler and the undersize of the chippings, should preferably form only a small component of the sand content. The sand content preferably has a flow coefficient of <30 (according to DIN EN 933-6, Section 8).

For the filler, it is of particular advantage if it is predominantly or exclusively limestone filler, ie rock powder from limestone (limestone rock powder). This leads to the desired mortar property in the asphalt mix. In addition, the partial or total replacement by filler from other rocks or substitutes such as glass, metal (s), plastics, fly ashes, in particular with certain properties (eg stiffening), possible.

The bituminous mixture according to the invention has already contained the surface properties determining aggregates from the very beginning in the bituminous mixture. This is reflected in the significantly increased chippings content with aggregates> 1 mm, preferably> 2 mm. The surface properties of the road surface layer and, if necessary, the intermediate layer, binder layer and / or sealing layer determining aggregates therefore need not be applied in a further operation as Abstreugut.

For the bituminous mixture according to the invention, the binder is a bitumen or at least one thermoplastic binder or mixtures of these binders, preferably a bitumen for the production of temperature-reduced asphalt (siohe Leaflet for temperature reduction of asphalt (M TA), issue 2006 ), a polymer-modified bitumen according to DIN EN 12591 or a road construction bitumen.

Finally, also applies to the bituminous mixture according to the invention that the viscosity of the bitumen can be lowered and / or changed by the use of viskositätsveranderirnden binders or by the use of viscosity-modifying additives to the binder and thus the installation temperature of the bituminous mixture can be lowered. In particular, with the bituminous mixture according to the invention, even with the use of suitable additives, a lower installation temperature (after mixing and transport) in a range of about 160 ° C. to about 180 ° C. or up to about 190 ° C. in comparison with a temperature lower limit of previously approx. 200 ° C to about 230 ° C.

It is essential in the application for the production of road surface layers that the bituminous mixture according to the invention does not have to be subjected to any additional stripping step on the road, although it is far less sensitive to compliance with the installation parameters than the above-explained, noise-improved bituminous mixture or as the conventional rolled mastic asphalt.

The invention also provides a process for producing a roadway top layer, intermediate layer, binder layer and / or sealing layer from an asphalt mixture according to the invention. According to the invention, the asphalt mixture according to one of claims 1 to 7 is used here.

According to a particularly preferred teaching of the invention is that the bituminous mixture with a temperature between about 160 ° C, preferably about 180 ° C, and 230 ° C, preferably between about 180 ° C and about 200 ° C, on a substrate for the installation of a Road surface layer, asphalt intermediate layer, Asphaltbinderschicht and / or asphalt sealant layer, wherein the term pad also includes the roadbed, is installed. This is the installation temperature of the bituminous mixture. By the installation method with paver or with mastic asphalt screed is achieved that the asphalt base course mix is in cross section with different properties, in particular the arrangement of the void content and the air voids, but also the tightness. So there is a classic especially dense Asphaltmischgut in the lower area. In the middle range is advantageous a small cavity supply, based on to a stone mastic asphalt. The uppermost part of the asphalt surface layer is more reminiscent of an open-pored asphalt with its cavity offer. This division in cross-section combines the advantages of all three of the above-mentioned overlay blends in one shipment.

According to the invention, in the bituminous mixture according to the invention, the second working step of chipping with chippings, which is required for a road surface covering layer, is dispensed with. The Asphaltmischgut invention is, as well as the known from the prior Te chnik mastic asphalt, installed without additional compaction by rolling. Since the second step is eliminated, also eliminates the need for conventional mastic asphalt mix use of rubber tyred rollers and heavy smooth-shell rollers.

According to a preferred teaching of the invention, it is only expedient that an aftertreatment of the asphalt mixture mixed with the substrate takes place by means of a light smooth-shelled roller, preferably a smooth-walled roller having a weight of less than 6 tons, in particular less than 4 tons. With this processing, only an alignment of the superficial grit grains takes place. This can not be compared with the expense of the second operation with previous Gussasphaftmischgut.

In principle, the asphalt mixture according to the invention can be installed on a suitable substrate (for example an asphalt binder layer) with a classic heavy cast asphalt pavement. According to the invention, however, it has been found that the present bituminous mixture can also be installed differently, namely in such a way that the mechanical installation takes place with a conventional lightweight road roller used for later to be compacted rolled asphalt. It should preferably be provided that already the paver is operated with a slight pre-compaction of the resulting road surface layer. The road paver preferably incorporates the asphalt layer with a precompression of approximately 1/3 of the maximum power through the first compaction unit of the paver. More preferably, further compaction units of the road paver are not used.

A road surface layer, intermediate layer, binder layer and / or sealing layer of the asphalt mixture according to the invention has a comparatively high stability and a high resistance to deformation. Corresponding tests have yielded excellent values.

Another positive characteristic of the bituminous mixture according to the invention is the fact that it is possible, unlike in Gussasphalteinbauverfahren, the pad with To spray a pressure-sensitive adhesive or with a bitumen emulsion, for better bonding of the layers. In addition, it is possible to incorporate the asphalt mixture according to the invention even with a moist surface. The resulting steam escapes through the finest pores without affecting the bond. The covering remains in the lower part of the cross-section as tight as a conventional mastic asphalt.

A particular advantage of the bituminous mixture according to the invention and the production of a roadway covering layer from this is that a road marking can already be finally applied immediately after the production of the roadway covering layer. Unlike the bituminous asphalt mix which is provided with chippings, a lane marking does not have to be applied again after a few weeks or months later.

An unclaimed method for transporting the asphalt composite to a job site where it is to be installed to a pavement top layer, interlayer, binder course and / or seal layer is described. For this transport method, it is expediently possible that the transport by means of conventional (normal) trucks, possibly with built-in insulation and / or heating device, ie trucks without agitator for the bituminous mixture, in particular Gussasphaltmischgut takes place.

In principle, the bituminous mixture according to the invention can also be transported in the casting asphalt tilers used for the known mastic asphalt mix, ie stir constantly during transport and maintain it at a high temperature. Due to its different composition, however, the bituminous mixture according to the invention is not dependent on continuous, in particular intensive, stirring in a mastic asphalt cooker. Rather, the asphalt mixture according to the invention also remains stable in its mixture for a long time during transport and exhibits only a slight settling or separation tendency, if at all.

Compared to conventional mastic asphalt, the bituminous mixture according to the invention permits a shift of the lower installation temperature limit by about 50 ° C., preferably 30 ° C., to a lower limit of about 160 ° C. to about 180 ° C. and thus lowers CO ₂ emissions.

Based on a comparison of the known method for producing a road surface layer of rolled mastic asphalt and the method according to the invention For the production of a road surface layer with the bituminous mixture according to the invention, the two systems should be compared again:

• Vorlegen zweier Randstreifen aus Gussasphalt mit einer Breite von je 0,5 m als seitliche Begrenzung und als Auflage für die Raupenfahrwerke der Gussasphaltbohie,
• Einbau des Gussasphaltmischgutes mit der Gussasphaltbohle mit einem Größtkorn, das auf die spätere Nutzung abgestimmt ist,
• Aufbringen des Abstreusplitts mit ca. 12 bis 15 kg/qm,
• Einkneten des Abstreusplitts mittels einer Gummiradwalze mit gleichzeitiger Vorbeugung gegen Blasenbildung im Falle einer feuchten Unterlage,
• Glätten der Unebenheiten, die durch den Einsatz der Gummiradwalze entstanden sind, mittels einer schweren, breiten Glattmantelwalze,
• Abkehren und Entsorgen des abgekehrten Abstreusplitts,
• Aufbringen einer vorläufigen Markierung, um den Verkehr freigeben zu können, die jedoch durch Splittverlust der Oberfläche nach einiger Zeit erneuert werden muß,
• Schneiden und Vergießen der Fugen zwischen der Fahrbahndeckschicht und den Randstreifen.

The conventional installation of a roadway layer of rolled mastic asphalt usually proceeds as follows:

• Presentation of two marginal strips of mastic asphalt with a width of 0.5 m each as a lateral boundary and as a support for the caterpillar tracked crawler tracks,
• Incorporation of the mastic asphalt mix with the mastic asphalt screed with a largest grain adapted for later use,
• Application of the spill with approx. 12 to 15 kg / qm,
• Kneading the chippings by means of a rubber roller with simultaneous prevention of blistering in the case of a moist surface,
• Smoothing the unevenness caused by the use of the rubber wheel roller by means of a heavy, wide smooth-walled roller,
• Sweeping and disposing of the rejected chippings,
• Application of a provisional marking in order to be able to release the traffic, which must, however, be renewed by splitting the surface after some time,
• Cutting and potting the joints between the road surface and the margins.

• Einstellen des Straßenfertigers auf eine leichte Vorverdichtung (insbesondere auf ca. 1/3 der maximalen Leistung der ersten Vorverdichtungseinheit) in Bezug auf die vorgesehene Dicke des Asphaltmischgutes, Einbau des Asphaltmischgutes mittels des Straßenfertigers in voller Einbaubreite (keine außenliegenden Raupenfahrwerke) als Fahrbahndeckschicht,
• Leichtes Abwalzen der Oberfläche der Fahrbahndeckschicht mittels einer leichten Glattmantelwalze zur Ausrichtung der oberflächig liegenden Splittkörner.

If a typical road paver for rolled asphalt is used for the manufacture of a road surface layer from the bituminous mixture according to the invention, which does not use crawler tracks, in particular external tracks, the method according to the invention reduces to two steps:

• Setting the paver to a slight pre-compaction (in particular to about 1/3 of the maximum power of the first pre-compacting unit) in relation to the intended thickness of the asphalt mix, installation of asphalt mix by means of the paver in full pave width (no external crawler tracks) as road surface,
• Slightly rolling off the surface of the road surface layer by means of a light smooth-walled roller for aligning the superficial grit particles.

On the surface described above, since there is no repellent chippings to be removed, the final lane mark can be applied immediately.

Even when using a conventional Gussasphaltbohle the inventive. Method even more effective than the known method for producing a road surface. It then occur only necessary for the formation of the edge strips for the crawler tracks of Gussasphaltbohle Verfahrensschritte.Bei the advantages of the flatness, the grip and the mark remains.

embodiment

• 20,0 M.-% Kalksteinfüller ≤ 0,063 mm (Hersteller: Hastenrather Kalkwerke Wwe. Wilhelm Meyer GmbH & Co. KG, 52249 Eschweiler, Deutschland);
• 4,0 M.-% Natursand > 0.063 mm, ≤ 2 mm, Fließkoeffizient 28 (Hersteller: ABB Asphalt-, Beton- und Baustoffhandel e.K., Hasenbuschstr. 46, 52531 Übach-Palenberg, Nordrhein-Westfalen, Deutschland);
• 76,0 M.-% Splitt (Basanit), PSV 52, > 2 mm, ≤ 5 mm (Hersteller: Andernacher Lavakontor GmbH & Co. KG Lavawerk, Eicher Str., 56645 Nickenich, Deutschland);
• Rohdichte des resultierenden Gesteinskörnungsgemisches (100 M.-% der Gesteinskörnungsmischung) 2,846 g/cm³
• 7,0 M.-% Bitumen für die Herstellung von temperaturabgesenktem Asphalt, Sübit VR 35 (EP RuK = 88,0 °C), Hersteller/Händler: GKG MINERALOEL HANDEL GmbH & Co. KG Stuttgart, Liebknechtstr. 50, 70565 Stuttgart (Deutschland)
• Rohdichte des Asphaltmischgutes (nach Zugabe von 7,0 M.-% Bitumen) 2,546 g/cm³ Mischtemperatur ≤ 190 °C (in Mischanlage)
• Einbautemperatur ca. 180 °C (nach Mischen und Transport)

The following recipe has proven itself in tests:

• 20.0% by mass of limestone filler ≤ 0.063 mm (manufacturer: Hastenrather Kalkwerke Wwe, Wilhelm Meyer GmbH & Co. KG, 52249 Eschweiler, Germany);
• 4.0% by mass natural sand> 0.063 mm, ≤ 2 mm, flow coefficient 28 (manufacturer: ABB Asphalt-, Beton- und Baustoffhandel eK, Hasenbuschstr 46, 52531 Übach-Palenberg, North Rhine-Westphalia, Germany);
• 76.0 mass% chippings (basanite), PSV 52,> 2 mm, ≤ 5 mm (manufacturer: Andernacher Lavakontor GmbH & Co. KG Lavawerk, Eicher Str., 56645 Nickenich, Germany);
• Bulk density of the resulting aggregate mixture (100% by mass of the aggregate mixture) 2.846 g / cm ³
• 7.0 M .-% bitumen for the production of temperature-reduced asphalt, Sübit VR 35 (EP RuK = 88.0 ° C), manufacturer / dealer: GKG MINERALOEL HANDEL GmbH & Co. KG Stuttgart, Liebknechtstr. 50, 70565 Stuttgart (Germany)
• Density of asphalt mix (after adding 7.0 M .-% bitumen) 2.546 g / cm ³ Mixing temperature ≤ 190 ° C (in mixing plant)
• Installation temperature approx. 180 ° C (after mixing and transport)

The surface texture of a road surface layer of the bituminous mixture according to the invention has such a favorable shape that a significant reduction in noise compared to the known mastic asphalt mix and in particular compared to previously classified as low noise asphalt topcoats, eg Splittmastixasphält is to be expected. The flat surface with grit grains lying relatively flat reduces the rolling noise of vehicles. On the surface creates a favorable pore space by the rolling with the light smooth coat roller. This also promotes drainage in the wet. The reduction in noise of an asphalt cover sheet produced with the bituminous mixture according to the invention is so favorable that the D _strO value (correction value for different road surfaces according to RLS-90 guidelines for noise protection on roads) is equal to that of an open-pored asphalt, D _strO -5 dBA) ,

Claims (14)

1. A self-compressing mastic asphalt mixture, in particular for roadway topcoats, asphalt intermediate layers, asphalt binder layers and/or asphalt sealing layers, preferably of class 0/8 or 0/5,
   consisting of stone chippings, sand, filler and binding agent, as well as optionally additives, wherein the total mass of all components is 100 M.-%,
   characterized in that
   the stone chippings content having aggregate > 1 mm lies between 65 M.-% and 80 M.-%,
   the sand content of natural and/or crushed sand having a grain size > 0.063 mm and ≤ 2 mm lies between 2 M.-% and 15 M.-%,
   the filler content having aggregate ≤ 0.063 mm lies between 15 M.-% and 20 M.-%, and
   the binding agent content lies between 6.8 M.-% and 7.5 M.-%.
2. An asphalt mixture according to claim 1,
   characterized in that
   the sand content of natural and/or crushed sand having a grain size > 0.063 mm and ≤ 2 mm lies between 6 M.-% and 12 M.-%.
3. An asphalt mixture according to claim 1 or 2,
   characterized in that
   the sand content consists entirely or predominantly of natural sand.
4. An asphalt mixture according to any one of claims 1 to 3,
   characterized in that
   the filler content consists entirely or predominantly of limestone.
5. An asphalt mixture according to any one of claims 1 to 4,
   characterized in that
   the binding agent is a bitumen or at least one thermoplastic binding agent or mixtures thereof.
6. An asphalt mixture according to claim 5,
   characterized in that
   the bitumen is a bitumen for making lower-temperature asphalt, a polymer-modified bitumen according to DIN EN 12591 or a bitumen for road construction.
7. An asphalt mixture according to either one of claims 5 and 6,
   characterized in that
   the viscosity of the bitumen has been reduced and/or used by use of viscosity-modifying binding agents or by use of viscosity-modifying additives and the installation temperature of the asphalt mixture has thereby been reduced.
8. A roadway topcoat, asphalt intermediate layer, asphalt binder layer and/or asphalt sealing layer made from an asphalt mixture,
   characterized in that
   an asphalt mixture according to any one of claims 1 to 7 is provided.
9. A method for making a roadway topcoat, asphalt intermediate layer, asphalt binder layer and/or asphalt sealing layer made from an asphalt mixture, characterized in that
   an asphalt mixture according to any one of claims 1 to 7 is used.
10. A method according to claim 9,
    characterized in that
    asphalt mixture having a temperature between approximately 180°C and 230°C, preferably between about 180°C and about 200°C, is installed.
11. A method according to claim 9 or 10,
    characterized in that
    the mechanical installation is carried out with a road paver.
12. A method according to claim 11,
    characterized in that
    the road paver is operated so as to produce a slight precompression of the resulting layer, in particular the roadway topcoat.
13. A method according to any one of claims 9 to 12,
    characterized in that
    a post-treatment of the asphalt mixture installed on a substrate is carried out using a light smooth roller, preferably with a smooth roller weighing less than 6 tonnes, in particular less than 4 tonnes.
14. A method according to any one of claims 9 to 13,
    characterized in that
    immediately following the installation of the asphalt mixture as the roadway topcoat, a final roadway marking is applied to the roadway topcoat.