EP1029001A1

EP1029001A1 - Method for producing asphalt-containing coverings in road building and industrial constructions

Info

Publication number: EP1029001A1
Application number: EP98951417A
Authority: EP
Inventors: Brunner Manfred
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-09-16
Filing date: 1998-09-16
Publication date: 2000-08-23
Also published as: WO2000015719A1

Abstract

The invention relates to a method for producing asphalt-containing coverings in road building and industrial constructions on good bearing, optionally rolled, beds, by applyingith finishers or by hand a hot asphalt mixture consisting of a flowable, hot and thoroughly mixed covering material made of a mineral granular structure, at least one binder, one or several filler materials and at least one filler material additive on the bed in the desired thickness and subsequently compacting the covering. The invention also relates to the utilization of said method for producing asphalt coverings, asphalt concrete coatings, mastic-grouted asphalt surfacings, poured asphalt coatings, asphalt mastic surfacings, industrial pavements and industrial floorings, preferably with a thickness ranging between 0.5 to 20 cm, particularly between 2 to 10 cm, especially between 3 and 8 cm.

Description

Process for the production of asphalt-containing coverings in road and

Industrial building

Description

The invention relates to a process for the production of asphalt-containing coverings in road and industrial construction on load-bearing, optionally rolled substrates by applying, by means of pavers or by hand, a hot asphalt mixture which consists of a flowable, hot, well-mixed application mass from a mineral Grain structure, at least one binder, one or more fillers and at least one filler additive, on the base in the desired thickness and then compacting the covering.

The invention also relates to the use of this method for the production of asphalt coverings, asphalt concrete coverings, stone mastic asphalt coverings, Mastic asphalt coverings, asphalt mastic top layers, industrial asphalt screed coverings and industrial floors, preferably in thicknesses from 0.5 to 20 cm, in particular from 2 to 10 cm, especially from 3 to 8 cm.

Asphalt-containing road surfaces generally consist of crushed stone, grit, sand, binding agent (s) (e.g. bitumen, pitch) and fillers (e.g. lime powder, quartz powder and other stone powder). The materials mentioned are mixed with one another and applied in the form of a flowable application mass (mix) with the aid of pavers or by hand to the prepared, stable, possibly rolled road surface in the desired thickness, followed by compaction, for example by means of rollers.

When choosing the building materials and the composition of the mix, the traffic load (type and amount of traffic) as well as the climatic and local conditions must be taken into account. The mix is to be put together in such a way that it has a quality suitable for the intended use. The asphalt or bitumen binder must have such a composition that, in addition to high stability, good durability is also achieved. Cover layers must also have the required surface properties permanently.

In the case of rolled asphalt (asphalt binders, asphalt concrete, split mastic asphalt, base courses), a high and temperature-independent stability can be achieved, in particular by coordinating grit and crushed sand. The durability is achieved with as much binder as possible if there is sufficient cavity. Harder binders and lower binder contents favor the formation of cracks and can only be considered as a compromise when the ceilings are subjected to extremely high traffic loads. In mastic asphalt, the interaction of binder and filler and their distribution in the grain structure made up of gravel, grit, gravel and sand are crucial.

Certain highest and lowest temperatures must be observed during preparation and installation. Overheating can lead to oxidation and hardening of the binder, while temperatures that are too low cause defects in installation and compaction. As a rule, installation takes place at a temperature in the range from 60 to 250 ° C., preferably from 130 to 220 ° C., in particular from 190 to 210 ° C.

The thickness in which the asphalt-containing coverings are installed is preferably 0.5 to 20 cm, in particular 2 to 10 cm, especially 3 to 8 cm.

Recently, so-called

Thin asphalt concrete coverings are used, the thickness of which is less than that of conventional road surfaces. A very soft bitumen, for example bitumen B200, is used as a binder. It has been shown that the adhesive strength of these thin coverings is insufficient in spite of the use of a soft bitumen, which means that such thin coverings are damaged or completely or partially destroyed in a relatively short period of use.

Another disadvantage that occurs in the production of road coverings according to the prior art is that the commonly used crushed stone, grit, gravel and sand consist mainly of quartz (granite, gneiss, basalt) and that in their large-scale production in the Processing appropriate mineral powders, flours and dusts arise, but can only be used to a limited extent as fillers in the flowable application masses, since the asphalt and bitumen binders commonly used have little adhesion to these fillers. The road surfaces made with it are unstable and at Demolding tendencies occur in the production of this casting compound. In addition, the mineral dust and powder, insofar as they cannot be used in road construction, must be disposed of at great expense.

According to the current state of the art, one is therefore forced to

Production of the coating compositions for asphalt-containing road surfaces to mix the quartz fillers up to 50% by weight of lime fillers and to add certain filler additives, for example up to 0.5% by weight of cellulose (granules, fibers), in order to achieve the required adhesive strength and to ensure the stability of asphalt-containing coverings in road and industrial construction. Lime filler and cellulose additives are, however, relatively expensive and, furthermore, they complicate the mixing process in the production of the casting compounds.

The resulting reduction in the proportion of quartz fillers in the casting compound places narrow limits on the manufacture of durable, abrasion-resistant road surfaces, apart from the fact that the quartz fillers which are present in large quantities and can only be used in limited quantities in road construction involve high disposal costs .

The object of the invention was therefore to remedy the disadvantages of the prior art and to make the production of asphalt-containing coverings in road and industrial construction technically simpler and more economical.

It has now been found that this object can be achieved in that the filler additives and / or some of the fillers used hitherto even in the production of asphalt mixtures for asphalt-containing coverings in road and industrial construction by natural and / or synthetic zeolite is replaced. On the one hand, this can significantly improve the adhesive strength of the binder on the mineral grain structure of the application mass made of gravel, grit, gravel and / or sand, and thus a higher stability of the asphalt-containing covering can be achieved, on the other hand, by increasing the quartz filler content to values of up to 99.7% of the total filler content the production of stable, durable, abrasion-resistant asphalt-containing coverings can be achieved while at the same time dispensing with expensive cellulose and lime filler additives.

The invention relates to a process for the production of asphalt-containing coverings in road and industrial construction on load-bearing, possibly rolled underlays by applying. By means of finishers or by hand, a hot asphalt mixture consisting of a flowable, hot, well-mixed application compound from a mineral Grain framework, at least one binder, one or more fillers and at least one filler additive, on the base in the desired thickness and subsequent compacting of the covering, which is characterized in that a flowable application composition is used, which consists of 4.5 up to 18.5% by weight of binder, 2.0 to 12.5% by weight of filler, 0.3 to 6.5% by weight of filler additive and the remainder made from mineral grain structure.

Preferred embodiments of the method according to the invention consist in:

the flowable coating composition has a temperature of 60 to 250 ° C, preferably 130 to 220 ° C, in particular 190 to 210 ° C, when processed;

the mineral grain structure of the application mass consists of crushed stone, grit, gravel, sand, blast furnace, metal smelter and / or phosphorus slag, each with a grain size of 0.01 to 25 mm, preferably 0.09 to 15 mm;

the binder of the application composition consists of bitumen, pitch, tar, asphalt, cement, lime and / or synthetic resin; and or the filler contains quartz powder, lime powder and / or another stone powder with a particle size in the range from 30 to 150 μm, preferably 80 to 100 μm.

In carrying out the process of the invention is used in the coating composition as a filler additive, preferably a powder or granules of at least one natural and / or synthetic zeolite, optionally in admixture with natural or synthetic fibers, Apocel ^®, Technocel ^®, TOPCEL ^®, asbestos and / or naphthalene.

The zeolite powder or granulate preferably has a grain size of 5 to 150 μm, in particular 10 to 120 μm, very particularly 50 to 90 μm, and it is used in an amount of 0.3 to 50% by weight. , preferably from 1 to 30 wt .-%, especially from 5 to 10 wt .-%, based on the weight of the filler, used in the coating composition or in the mix. The rest of the filler can consist of any other stone powder, preferably quartz powder or quartz dust.

The working method according to the invention gives the asphalt-containing covering a high adhesive strength and a high stability. At the same time, the manufacturing costs are significantly reduced because the filler no longer has to contain the expensive lime filler and cellulose admixtures. In addition, the mixing process can be significantly simplified and made more economical by using a single filler additive. Since the proportion of quartz fillers in the finished asphalt-containing covering can be increased considerably compared to the prior art, it is also possible to produce more stable, more durable and more abrasion-resistant coverings in road and industrial construction, which have no tendency to crack even with high temperature fluctuations have and are extremely temperature-resistant (at high and low temperatures). The flowability properties of the casting composition and its processing properties are not adversely affected by the zeolite additive used according to the invention. Even when lime fillers are used alone or in a mixture with quartz fillers, the zeolite used according to the invention gives the asphalt-containing coverings produced therefrom improved adhesion and significantly improved stability. This improvement in quality and the saving of additional fillers or filler additives result in targeted advantageous areas of application in road construction and in the industrial sector, while at the same time being more economical.

In particularly preferred embodiments of the method of the invention:

as filler additive at least one zeolite or zeolite mineral from the Heulandite group, muscovite (IIIitite), smectite, thomsonite, actinolite and / or stilbit, preferably the Heulandite mineral clinoptilolite;

used as filler additive is a natural zeolite or a natural zeolite mineral which has been modified by physical, in particular thermal pretreatment at a temperature of preferably 60 to 250 ° C, in particular 80 to 140 ° C;

as a filler additive, a natural zeolite mineral with the following average mineralogical composition (in% by weight):

Clinoptilolite 85 Muscovite / Illite 5

Smectit 5

Quartz <1

Carbonate (calcite) 3.2 organic substance 1;

as a Heulandite mineral clinoptilolite with the general chemical composition: (Na, K, Ca, Mg) ₆ (Al ₆ Si ₃₀ O ₇₂ ) x 20 H ₂ O; and or

as a Heulandite mineral, natural clinoptilolite with the following average chemical composition:

SiO ₂ 61, 81

AI ₂ O ₃ 11, 46

Fe ₂ 0 ₃ 1, 55

CaO 4.70

MgO 1, 20

Na ₂ 0 0.54

K ₂ O 1, 93

TiO ₂ 0.16

MnO 0.01

Loss on ignition up to 1000 ° C 15.17

According to a further preferred embodiment of the invention, a flowable application composition is used, which additionally contains an asphalt modifier from the group consisting of rubber powder from unvulcanized natural rubber, latex as synthetic rubber milk, preferably Baypren latex, an aqueous dispersion of a heat-resistant synthetic rubber Contains polychloroprene, rubber powder from old tires and heat-resistant polymers in a proportion of up to 5% by weight, based on the weight of the binder.

The invention also relates to the use of the method described above for the production of asphalt coverings, asphalt concrete coverings, stone mastic asphalt coverings, mastic asphalt coverings, asphalt mastic cover layers, industrial asphalt screed coverings and industrial floors, preferred wise in thicknesses from 0.5 to 20 cm, in particular from 2 to 10 cm, especially from 3 to 8 cm.

The invention is explained in more detail in the following example.

example

State-of-the-art filler composition:

50% by weight quartz filler 49.7% by weight lime filler 0.3% by weight cellulose additive

Filler composition according to the invention:

a) 70 to 99.7 wt .-% quartz filler

30 to 0.3 wt .-% zeolite filler or

b) 70 to 95% by weight lime filler 30 to 5% by weight zeolite filler.

Experiments with the filler compositions mentioned above have shown that the zeolite admixture in the quartz filler area enables a significantly higher quartz filler content and that no additional binder additives such as cellulose and the like are required to achieve excellent stability of the asphalt-containing covering.

Improved stability is also achieved in the lime filler area, since the zeolite used according to the invention has excellent adhesive strength to bitumen and is therefore ideally suited for addition to the ballast or grit used. According to the invention, both improvements in quality and savings in fillers and filler additives are possible without this being associated with any disadvantages.

The asphalt-containing coverings produced according to the invention can be customary asphalt modifiers, for example from the group consisting of rubber powder from unvulcanized natural rubber, latex as synthetic rubber milk, preferably Baypren latex, an aqueous dispersion of a heat-resistant synthetic rubber based on polychloroprene. Rubber powder from old tires and heat-resistant polymers in a proportion of up to 5% by weight, based on the weight of the binder, are used to achieve special effects, for example an elastic whisper asphalt covering.

With the zeolite additive according to the invention, in particular, an advantageous grit mastic asphalt with a particularly high granite flour content can be produced, which is clearly superior in technical and economic terms with regard to heat resistance and cold behavior to suitably produced toppings using limestone powder and cellulose fibers. Advantages according to the invention are also achieved in the production of the mixture itself in that demixing is reliably prevented by the binder running off during production, transport, installation and compaction.

Claims

Patent claims

1.Procedure for the production of asphalt-containing coverings in road and industrial construction on stable, possibly rolled underlays by applying a hot asphalt mixture using a paver or by hand, consisting of a flowable, hot, well-mixed application compound made of a mineral grain structure, at least one binder , one or more fillers and at least one filler additive, on the substrate in the desired thickness and then compacting the covering, characterized in that a flowable application composition is used, which consists of 4.5 to 18.5% by weight of binder , 2.0 to 12.5% by weight of filler, 0.3 to 6.5% by weight of filler additive and the rest made of mineral grain structure.

2. The method according to claim 1, characterized in that the flowable coating composition has a temperature of 60 to 250 ° C, preferably from 130 to 220 ° C, in particular from 190 to 210 ° C during its processing.

3. The method according to claim 1 or 2, characterized in that the mineral grain structure of the application mass of gravel, grit, gravel, sand,

Blast furnace, metal smelter and / or phosphorus slag, each with a grain size of 0.01 to 25 mm, preferably 0.09 to 15 mm.

4. The method according to at least one of claims 1 to 3, characterized in that the binder of the application composition from bitumen, pitch,

Tar, asphalt, cement, lime and / or synthetic resin.

5. The method according to at least one of claims 1 to 4, characterized in that the coating composition contains quartz powder, lime powder and / or another stone powder with a particle size in the range of 30 to 150 microns, preferably 80 to 100 microns as a filler.

6. The method according to at least one of claims 1 to 5, characterized in that the coating composition as a filler additive, a powder or granules of at least one natural and / or synthetic zeolite, optionally in a mixture with natural or synthetic fibers, Apocel ^® , Technocel ^® , Topcel ^® , asbestos and / or naphthalene.

7. The method according to claim 6, characterized in that the zeolite powder or granules have a grain size of 5 to 150 microns, preferably 10 to 120 microns, particularly preferably from 50 to 90 microns, and in an amount of 0.3 up to 50% by weight, preferably from 1 to 30% by weight, in particular from 5 to 10% by weight, based on the weight of the filler.

8. The method according to at least one of claims 1 to 7, characterized in that at least one zeolite or zeolite mineral from the heulandite group, muscovite (lllite), smectite, thomsonite, actinolite and / or stilbit is preferably added as filler the Heulandite mineral clinoptilolite.

9. The method according to claim 8, characterized in that a natural zeolite or a natural zeolite mineral is used as filler additive, which (by) by physical, in particular thermal pretreatment at a temperature of preferably 60 to 250 ° C, in particular 80 up to 140 ° C, has been modified.

10. The method according to claim 8 or 9, characterized in that a natural zeolite mineral with the following average mineralogical composition (in wt .-%) is used as filler additive:

Clinoptilolite 85 Muscovite / Illite 5

Smectit 5

Quartz <1 Carbonate (calcite) 3.2 organic substance 1

11. The method according to at least one of claims 8 to 10, characterized in that clinoptilolite with the general chemical composition is used as the heulandite mineral:

(Na, K, Ca, Mg) ₆ (Al ₆ Si ₃ oθ7 ₂ ) x 20 H ₂ 0

12. The method according to at least one of claims 8 to 11, characterized in that natural clinoptilolite with the following average chemical composition is used as the heulandite mineral:

SiO ₂ 61, 81

AI ₂ O ₃ 11, 46

Fe ₂ 0 ₃ 1, 55

CaO 4.70

MgO 1, 20

Na ₂ 0 0.54

K ₂ O 1, 93

TiO ₂ 0.16

MnO 0.01

P ₂ 0 ₅ 0.03

Loss on ignition up to 1000 ° C 15.17

13. The method according to at least one of claims 1 to 12, characterized in that a flowable coating composition is used, which additionally contains an asphalt modifier from the group rubber powder made from unvulcanized natural rubber, latex as synthetic rubber milk, preferably Baypren latex, an aqueous dispersion of a heat-resistant synthetic rubber based on polychloroprene, rubber powder from old tires and contains heat-resistant polymers in a proportion of up to 5% by weight, based on the weight of the binder.

14. Application of the method according to at least one of claims 1 to 13 for the production of asphalt coverings, asphalt concrete coverings, stone mastic asphalt coverings, mastic asphalt coverings, asphalt mastic top layers, industrial asphalt screed coverings and industrial floors, preferably in thicknesses from 0.5 to 20 cm, in particular from 2 to 10 cm, especially 3 to 8 cm.