DE2331727A1 - Bitumen, tar or pitch contg. poly(meth)acrylate - as road-surfacing compsn. or adhesive of high bonding strength and softening pt. - Google Patents

Abstract

Bitumen, tar or tar pitch are improved by incorporation of a high-mol. (meth)acrylate, followed by granulation. The adhesiveness and bonding power, and the temp. range between breaking point and softening point are increased. The Marschall stability, notch tensile strength and resistance to abrasion are improved. The adhesion to stone is better.

Description

Dipl.-Ing. W. Dahllce June 18, 1973

DipL-lng. Η.-]. Lippert Da / Li

Patent attorneys

506 R «froth near Cologne Frenkenforster SiraSe 137

Karl-Peter SoIf Bensberg-IPrankenforst

Additive to improve road building materials using bitumen and / or tar

The invention relates to an additive that contains bitumen and / or road building materials containing tar and rock material is added. The additive is essentially for improvement provided by bitumen and tar. In addition to its possible uses For road construction, the additive is also suitable for building protection and as an adhesive.

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As a result of today's traffic loads and other related effects, today's bituminous ones correspond to Road structures no longer meet the requirements.

The binder, without using this additive, has on the one hand Insufficient adhesive strength, which is particularly evident at low temperatures due to stone loosening and cracking expresses. On the other hand, the structure tends to deform at higher outside temperatures. This technical part is on it due to the fact that the binder contained in the building structure at higher temperatures due to the associated decrease in viscosity has too high a plasticity.

Despite numerous attempts to eliminate these disadvantages, it was only achieved that either the binder became more plastic, that is, its softening point has been lowered, or that the plasticity has been reduced so much, that is, the softening point is so was raised far that the binder became too hard.

Through these rheological changes it was only achieved in most cases that the negative properties ge were strengthened by temperature

Other measures that improve the binding agent

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Should achieve properties, however, the adhesive strength was impaired. As a result, a mineral part encased by the binding agent and detached from the structure no longer could be found let stick with the rest of the mass.

Further attempts to achieve an improvement through additives showed that no homogeneous constriction was achieved with the binder became.

The invention is based on the object of the To improve the binder with an additive. According to the invention, this object is achieved in that the additive used is a high polymer Aorylate or methaorylate is used. This is preferably done with the bitumen to be improved or the like blended and processed into granules, which are later added to the road building materials or road building material.

It is preferably provided that a polymer of methacrylic acid is used.

Depending on the desired adhesive properties and other properties the improved binder can be used in amounts of 5 to 50 percent by weight of the bitumen, tar or this additive Add tar pitch. In addition to improving the adhesive properties

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This also raises the softening point, the break point decreased and ductility and penetration improved.

In the finished mix that is improved by such an additive Contains binder, the results are better values for marshal stability, splitting tensile strength and abrasion resistance.

Furthermore, the adhesion of the binder to the rock is favorably influenced by adding an adhesive to the additive. Since you the granulated binding agent provided with the additive to the road construction mix only during the mixing process or for a short time can be added before laying as a building structure, the binder provided with the additive is only briefly suitable for processing exposed to the required higher temperatures and thus the adhesive which is sensitive to prolonged exposure to temperature not harmed. The adhesion is preferably improved by adding up to 25 percent by weight a fatty acid to acrylate or methacrylate. It is preferred either a stearic acid aminoamide or a polyaminoamide is used as the fatty acid.

Furthermore, it is proposed according to the invention that the component

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the bitumen, tar or tar pitch and the additive contains, add up to 30 percent by weight of a filler, preferably Limestone powder or calcium carbonate.

The additive is added in the production of rolled asphalt most expediently during the mixing process, during or shortly after the addition of the binder to the one present in the mixer Rock. The addition can take place in a metered manner via conveyor screws or the like.

The additive is added in the production of mastic asphalt expediently only after its conventional completion and filling into the mastic asphalt boiler. Here is the one described Addition is advantageous in that the usual mixing time at the mixing plant is not extended in time by the dissolving process will.

The additive can only be used a short time before the mastic asphalt boiler is emptied can be added to the mix at the construction site so that the additive can be used in the event of a fault on the construction site is not unnecessarily thermally stressed.

A particular advantage of the additive is that the

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Mix production no changes to the conventional process required are. In addition, no additional storage for binders is required. Rather, they can Customary binders can be used for the production of the mixed material.

The invention is described in more detail below in a few exemplary embodiments.

Example 1 ;

50 percent by weight of a methacrylate with a low degree of polymerization, So in a soft setting, 50 percent by weight bitumen "B 15" is mixed and granulated.

Example 2:

80 percent by weight of a methacrylate-bitumen mixture according to Example 1 are up to 20 percent by weight of stearic acid-aminoamides mixed in and only then granulated.

Example 5:

Before adding to the aorylate and before adding the stearic acid-aminoamide according to Examples 1 and 2, up to 30 percent by weight are added to the bitumen Limestone powder was added and only then granulated.

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Example 4;

Instead of the bitumen used in example 2, natural asphalt is used. Otherwise, the details of the example remain 2 also applies to this example

Example 5t

Tar is used instead of asphalt. The tiarig information stay unchanged.

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Claims (6)

Claims 1. Additive for improving bitumen, tar or tar pitch, whereby in particular the adhesiveness, the adhesiveness and the temperature range between the breaking point and the softening point are increased, characterized
by a high-polymer acrylate or methacrylate, which with the; to be improved bitumen or the like is mixed and processed into granules. 2. Additive according to claim 1, characterized in that a polymer of methacrylic acid
is used. 3. Additive according to claim 1 and 2, characterized by the addition of up to 30 percent by weight of filler to the component containing bitumen, tar or tar pitch. 4. Additive according to claim 1b is 3, characterized by an addition of up to 25 percent by weight of a Fatty acid to acrylate or methacrylate. Is 5. additive äaii used according to claim 4, characterized in that as fatty acid stearic acid aminoamide. - 9 409883/1133 6. Additive naoh claim 4, characterized in that a polyaminoamide is added as a fatty acid will. 409883/1133