DK141969B - Process for preparing a bituminous binder for building and coating materials. - Google Patents

Description

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DENMARK (S1) lntcl · 3 c 08 l 95/00 «(21) Note 4-089 / 75 (22) Filed on 12th ββρ. 1975 (23) Live 12, fled. 1975 (44) The application presented and presented to the public on 28 July. 19 ^ 0

DIRECTORATE OF

PATENT AND TRADEMARK (30) Priority beaker * from it

15 * sep. 1974, 74lq / 74, AT

May 2, 1975, 3406/75, AT

(71) BUHZL & BIACH AETIENGESELLsCHAFT, Vienna II, EngerthBtrasee 16l-165, "AT.

(72) Inventor: Rudolf Hemersam, Vienna XI, Geieelbergatr. 16/4, AT.

(74) Plenipotentiary in the proceedings · Treatment:

International Patent Office.

(g4) Process for preparing a bituminous binder for building and coating materials.

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a process for the preparation of a bituminous binder for building and coating materials, hereinafter briefly referred to as building materials containing dispersant solids, predominantly of inorganic nature such as stone shards, gravel and sand, and particularly serving. for the manufacture of compression and molding coatings in which the process bitumen and a polyolefin material for forming the binder, while stirring, are homogenized with each other in a hot mixing plant during melting and dissolving of the polyolefin material.

Many building materials are known which are constructed using a bituminous binder. A particularly widespread application is finding bituminously bonded building materials in the manufacture of the coating of carriageways, but also their lower layers, and also roof coatings, in which connection e.g. can be referred to building materials which are known by the names cast asphalt, roller asphalt and bitumenkis.

For paving materials, a binder proportion of less than 15% of the rock or sand material is usually selected. The bitumen which serves as a binder for the above-mentioned building materials has, besides advantages, also a number of disadvantages. Thus, the bitumen at elevated temperature, so that it often settles on sun-irradiated surfaces, favored by the dark color of bituminium, tends to become soft, whereby due to the traffic load on layers made with such building materials, strong scratches or deformations may occur. . Conversely, at temperatures below 0 ° C, brittle phenomena occur for the bitumen, which can also cause damage to the coating material as a result of the traffic congestion of traffic or street areas. Both the undesirable tendency of bitumin to soften at high ambient temperatures as well as its brittleness tendency at low ambient temperatures can be substantially improved by the addition of polyolefins thereto, and such polyolefin addition also greatly improves the strength of bituminously bonded building materials. As regards the addition of polyolefins to bitumen, which serves as a binder for building materials, there are also a number of proposals which partly encourage the incorporation of specially selected polyolefins into the bitumen and partly aim at certain modalities for the mixture of bitumen and polyolefins. If the properties of the bituminous binders thus obtained and the properties of building materials bound with such bituminous binders are investigated, it is found that with increasing content of polyolefin constituents the softening tendency of the bitumen at high temperatures and its cold brittleness is increased, and at the same time the strength of building materials bonded with such binders in an absolutely desirable manner. However, it turns out that in parallel with this increasing content of polyolefin constituent in the bituminous binder also increases the stiffness of the building materials bound with such binders in the processing temperature range, and thus difficulties arise when one wants to process such building materials. a technique well known in the art of building materials bonded with conventional bitumen, and e.g. will lay out such paving material with a conventional road laying machine. This fact, but also the higher cost of manufacture of polyolefin material in relation to bitumen, may in this way have been decisive for the hitherto endeavors, by means of gentle conditions of the addition of bitumen and polyolefin, to preserve disa chemical structure, since the conclusion was evidently that to obtain a steady improvement in the temperature conditions of a bituminous binder, as well as to obtain a certain increase in strength of a building material bound with such binder, a lesser amount of polyolefin would be sufficient. less the chemical build-up of the polyol fine material is destroyed during the mixing with the bitumen * thereby it is also obvious in this regard to interleave the further consideration that the processing of such a bonded building material presumably goes so much easier from the hand, the less the stiffness of the material increasing. polyolefin addition is selected.

It is now an object of the present invention to provide a process of the kind already mentioned in which a bituminous binder for building materials can be readily prepared which allows these building materials to be incorporated without difficulty with the usual methods and machines, and in particular also incorporating a paving material bonded with such a binder, with so-called road laying machines ("Trassenfertigern"), by which method formation of blends between bituminous and the polyolefin material is discouraged.

The process according to the invention of the aforementioned kind is characterized in that the bitumen and polyolefin material which polyethylene and / or polypropylene is used at a temperature between 260 and 310 ° C, preferably at approx. 290 ° C, is mixed or homogenized in the hot mixer so long as a homogeneous binder that a distinct decrease in viscosity of this binder occurs. As a result of this process, an intimate homogenization of the bitumen and polyolefin material takes place to a unique mass, whereby the viscosity of the binder mass thus formed can be reduced sufficiently long enough for a binder material produced with such a binder mass to be incorporated into the usual processing material. bituminous paving materials calculated ways. In spite of this, however, the advantages obtained by a polyethylene addition to bitumen, in particular the improvement of the temperature ratio, are shown. In addition, any tendency for a blend of polyolefin and bitumen by this process disappears even in the areas in which there have been blend deficiencies so far, and stable mixtures of polyolefin and bitumen 1A1969 4 can now be produced in practically all relevant conditions. , while it was previously assumed that there was a mixture deficiency at bitumen / polyolefin ratios of between 80:20 and 20:80, in which range it may be possible to blend the intermixed components.

It is particularly advantageous to carry out the process according to the invention in that the polyolefin material and the bitumen in the hot mixer are homogenized until the viscosity of the pulp has decreased by 1/5 to 1/10 of the viscosity value of the pulp immediately after the dissolution of the polyolefin material. Such a decrease in viscosity of 10-20% (in addition to the known decrease in viscosity due to the increase in temperature) is readily ascertained by the means available today. In this way, a molecular breakdown is already achieved to a satisfactory extent, which allows for easy laying, but at the same time a strengthening, of the paving.

It is particularly advantageous in the process according to the invention to proceed so that the polyolefin material is added to the bitumen in an amount that is at least 10% of the amount of bitumen. In the present process, the molecular degradation of the polyolefin material, which takes place during the heat action of the homogenisation, forms free valences that immediately react with the bitumen, especially its naphthenic constituents, and it can be assumed that such heat degradation also occurs in the bitumen. , which favors the maintenance of the aforementioned reaction. The stated amount of polyolefin material of at least 10% relative to the amount of bitumen is particularly important for the initiation of the chemical reaction between the degraded (cracked) polyolefin material and the bitumen.

In the process of the invention, polyethylene, both low-pressure polyethylene and high-pressure polyethylene, and / or polypropylene, is used as polyolefin material. Waste can also be used as a raw material base, even when contaminated with synthetic substances of a different chemical nature, since the process according to the invention also proceeds impeccably in the presence of foreign substances. Foreign substances, such as particles of thermosetting plastics or high-melting thermoplastics, which remain largely inert but also of other non-olefinic thermoplastics, behave similarly to fillers which do not participate in such a chemical reaction.

1A1969 5

It is believed that the degradation of the molecules of the polyolefinx material which occurs as a result of the aforementioned process of the invention is due to the relatively low viscosity of the bituminous binder produced by this process and the resulting relatively low stiffness of the bonded with this binder. building material.

If a particularly good heat resistance is sought for the binder and at the same time a substantial reduction in the cold brittleness, it is advantageous to ensure that the amount of polyolefin material is chosen greater than the amount that can bind with the bitumen naphthen content, so that in the homogenized binder polyolefin is still present. in finely divided form. Hereby, it can be assumed that the polyolefin molecule breakage pieces and bitumen formed in the polyolefin / naph then-bond 1 s have the property of emulsifying more degraded polyolefin material, particularly polyethylene, at 1 temperature. thus distributing it in the bitumen in the finest form; hereby, only the emulsified polyolefin material, owing to its fine distribution by the subsequent slow cooling, will, for the most part, solidify in crystalline form, thus obtaining said temperature ratio.

A further positive momentum emerges for the bituminous binders prepared in the foregoing process according to the invention in that they adhere very well to alkaline or acid-reacting rock material. This can be explained by the occurrence of salt bridges, in which at the interfaces rock material / bitumen is present in addition to the usual adhesion, so-called interface molecular compounds, in the present case salt bridges, which cause a further chemical bonding between stone and binder.

The faster the chemical reaction between the polyolefin material and the bitumen to occur in the homogenization process of the bitumen / polyolefin mixture occurring in the hot mixer, the faster the temperature at the mixing process is higher. At a temperature of approx. 290 ° C is obtained, the reaction proceeds within approx. 20 minutes at a polyethylene-bitumen mixing ratio of 30:70.

At a mixture ratio of 50:50, the reaction occurred within approx. 40 minutes. Thus, for the process of starting or reacting, and especially with respect to the reaction rate and the viscosities to be controlled, it has been found very advantageous to add the bitumen polyolefin material to the molecular degradation homogenization in an amount of between 30 and 100. % of bitumen volume »

Due to the practice of the process according to the invention, the viscosity of the polyolefin / bitumen mixture to be homogenized or subjected to a heat treatment goes through several phases.

First, there is hereby a relatively low viscosity which corresponds practically to the viscosity of the bitumen at the beginning of the working process, because at this point the polyolefin material has not yet melted, but is swimming in the bitumen in the form of small particles. Little by little, then, a melting of these polyolefin particles and hand-in-hand occurs, thus increasing the viscosity of the pulp.

After this phase, the viscosity decreases noticeably, which can be explained by molecular degradation of the polyolefin material. Thereafter, the viscosity remains substantially constant for a longer period or increases only slightly during the formation of polyolefin / bitumen compounds.

In the preparation of pavement binders, the viscosity drop by repeated melt index determination is advantageously measured during the treatment of the polyethylene material and the bitumen in the hot mixing plant.

Since, as already mentioned in the process according to the invention, binders with practically any ratio of bitumen to polyolefin material can be formed, in the interest of as simple and as economical a process embodiment as possible one can proceed so as to first produce a homogenized binder mass with a high proportion of polyolefin material, and that according to the invention to the homogenized bitumen / polyolefin mass, further bitumen is subsequently added so as to provide the ratio of bitumen to polyolefin desired for the particular application. It is hereby practically independent of the ratio of bitumen / polyolefin desired for the intended use to achieve the best possible course of the homogenizing heat treatment, since the homogenized bitumen / polyolefin pulp, after its formation, is readily stock-resistant and easily used after heating. after such storage, and the homogenization or heat treatment process need only be carried out at one mixing ratio, and according to the invention additional bitumen may be added to the thus homogenized bitumen / polyolefin pulp so that the selected polyolefin mixing ratio can be obtained at any time. / bitumen. Thus, it seems remarkable that the already obtained blending stability is not affected by such subsequent bitumen addition. A particularly homogeneous binder is thereby obtained when adding the already homogenized bitumen / polyolefin pulp to the additional bitumen and then mixing this binder mixture with the rock or sand material. However, it is also advantageous, in particular, to carry out the process according to the invention in the use of many existing bitumen plants equipped with a so-called "Trinidad container", so that the already homogenized bitumen / polyolefin pulp and additional binder are separated from each other. is introduced into a hot stone or sand material containing mixer. Using the aforementioned existing plants, the common heat treatment of the polyolefin material and the bitumen is thereby carried out in said Trinidad container, and the mass formed in this Trinidad container can be fed, especially injected into, the mixer in which the stone or sand material is mixed with bitumen. In this way, the process according to the invention can be carried out without difficulty with existing plants, and because of the viscosity reduction of the binder produced by the method according to the invention, the prepared paving material can also be incorporated or laid out with customary constructed existing plants.

When the binder bowl according to the invention is used for the production of building materials, this can be done by mixing the binder and the aggregate material warmly together, and for this the heating material is heated to a high temperature, but below the decomposition temperature of the binder. Thanks to these measures, it is achieved using it. bituminous binder manufactured by the process according to the invention with very advantageous properties.

Here, advantageous acid aggregate material such as quartz sand and / or quartz gravel or shear can be used advantageously.

Advantageously, the rock or sand material which is mixed with the bituminous binder in a preheated state is subjected to preheating to a temperature of approx. 200-280 ° C, whereby it must be observed that the selected preheating temperature is at least approx. 10 below the decomposition temperature of the polyolefin material.

The manufactured paving material exhibits very good mechanical properties and is particularly extremely stable to pressure due to the effect of traffic loads at elevated temperature. This is also reflected in the usual Marshall test, U1969 8 used for the evaluation of bituminous pavements, as a series of samples on manufactured pavement material was subjected to.

The invention is further explained in the following Examples, in which Examples A and B represent prior art.

Example A

Polyethylene waste in the form of thin transparent irregular 2 shaped leaves with a size of approx. 1-10 mm at a temperature of 180-200 ° C in a Kotthoff mixing siren was mixed with a conventional road building bitumen B 80 and this mixture was homogenized. Thus, mixtures having a polyolefin content of 3, 10 and 20 wt. Were prepared, and for homogenization with 3 wt. Polyolefin a mixing time of 10 minutes was required, at 10 wt. A mixing time of 15 minutes and at 20 wt. Polyolefin a mixing time of 30 minutes. to obtain a homogeneous product. The polyolefin / bitumen mixtures thus obtained had an increasingly gel-like character with increasing content of synthetic material. For these mixtures, softening point, ring and sphere, measured according to DIN 1995 and penetration measured according to DIN 1995, are these measured values which are compared in the following Table 1 with the similarly measured on the road building bitumen B 80 used in the mixture. values.

Table 1

Blandinc Composition Softening Point, Penetration according to Bitumen jPolyethylene ring and ball according to DIN 1995 ____ter DIN 1995__ at 2 ° C I at 25 ° C

No.__ Weight Weight ° C ~ 1 / lQ mm 1/10 mm 1 100 0 48.2 5 79 2 97 3 50.1 5 79 3 90 10 73.8 7 42 4 80 20 110.0 2 12

Example B

From the bituminous binders listed in Example A, the aggregate mixture corresponding to the building regulations of bituminous road pavements containing 10 weight limestone flour, 13 weight natural sand 0/2, 25 weight basalt fracture sand 0/2, 26 weight basalt gravel 2 5 and 26 weight basaltic gravel 5/8, made of asphalt mixtures using a binder content of 6.7 weight. Thus, as was also expected of the gel-like nature of the synthetic material containing the gelling properties of such asphalt mixtures containing binder with 10 and 20% content of synthetic material, a relatively high stiffness could be observed. did not allow the processing of such asphalt mixtures within the framework of the usual methods for bituminous paving materials, especially with mechanical pavers, seems possible.

From the asphalt mixtures obtained in the foregoing, Mashall test bodies were then formed as well with 2 x 50 stroke scan with 2 x 35 and 2 x 75 stroke, and these Marshall test bodies were then tested in the usual manner; hereby measured values were obtained as set out in the following Table 2.

1A1969 10

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Example 1

Using a Brabender-plas train graph, the viscosity ratios of polyethylene, polypropylene as well as of aryl ethylene bitumen mixtures and polypropylene bitumen mixtures were investigated at a constant temperature (290 ° C and 270 ° C, respectively) ± longer, during which the blending of the plastograph rotated down a screen. p & 60 rpm per minute, and the corresponding torque in the ether is pound was measured. In detail, 7 experiments were thus carried out, whereby here, in experiment 1, at 290 ° C, polyethylene debris which had already been painted was tested, in experiment 2, also painted polyethylene waste at 270 ° C was tested. 3, a mixture of polyethylene debris and road building bitumen B 80 in the mixing ratio 50 to 50 at 290 ° C was tested, in experiment 4 polyethylene debris and road building bitumen B 120 in the mixing ratio 50 »50 at 290 ° C were tested, in experiment 5 polyethylene waste and road construction bitumen B 120 were examined in the mixture ratio 30:70 at 290 ° C, in experiment 6 milled polypropylene waste at 290 ° C was tested, and in experiment 7 milled polypropylene waste and road building bit B 70 in ratio 30 »70 at 290 were investigated. ° C. The obtained measurement results are summarized in the following Table 3.

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From the measurement values given in the previous Table 1, it can be clearly recognized, as a result of the homogenizing heat treatment, that molecular degradation of the polyolefin material, which manifests itself in a viscosity decline. This molecular degradation thus results in the chemical degradation of the polyolefin / bitumen mixtures with the subsequent chemical reactions of the polyolefin material with the bitumin, in which the viscosity of the polyolefin / bitumen mixtures is subject to a clear decrease. and then for a considerable time remains essentially constant. The initial increase in viscosity of the polyolefin / bitumen mixtures initially found during the test is that the polyolefin material is not yet dissolved in the bitumen at the beginning of the test and therefore the meter shows essentially the viscosity of the bitumen and only after some time, as soon as the polyolefin material dissolved in the bitumen, the viscosity of this mixture emerges.

Thus, in the process of the invention for the preparation of bituminous binders as they are available for the polyolefin / bitmpen blends made in the experiments of this Example 1, a substantially lower viscosity of the bituminous binders thus formed after the homogenizing heat treatment, which allows for the processing of asphalt mixtures prepared from these binders using ordinary mineral additives, using the usual methods for bituminous building materials.

Example 2 In large experiments, polyethylene flock was homogenized with a usual road building bitumen B 120 at a working temperature of up to over 240 ° C for approx. 3 hours in a heat mixer designed for the processing of Trinidad asphalt. Thereby, a 50:50 mixture of polyethylene and bitumen was formed and this mixture was then added to a bitumen content of 15, 18, 20 and 25% with the addition of hotter bitumen, and these polyethylene / bitumen mixtures were then injected into usual blending assemblies (Wibau) containing a rock aggregate heated to 230 ° C, and thus asphalt blends were prepared, making of the 15, 18 and 25% polyethylene containing blends, and of a comparative purpose with bitumen, free of synthetic material, bonded building material, was prepared a road section with a total of approx. 600 m long and 5 m U1969 14 wide coating for medium traffic loads. The paving was made with a mechanical paver, and the material applied to this paver was then compressed with a rubber wheel roller and 2 tooth rollers. It could be stated that also the construction material made by means of the binder containing 25% polyethylene was impeccably processed with the mechanical paver, thus having a stiffness which allowed the maintenance of the usual processing methods for bitumen material. Despite this, subsequent studies on sample bodies made partly from the blend material and partly from the finished paving in the form of so-called drill cores showed that they obtained improvements by means of an addition to synthetic material bitumen despite the elaborate molecular degradation of the polyolefin material. which previously existed in full, and some values were also measured which allow an improvement of the properties compared to a simple addition of synthetic material to bitumen without molecular degradation. 't

It can also be noted that the fracture strength determined by Marshall bodies at 20 ° C caused the tensile break of bodies bound with bitumen without synthetic material to occur between the individual gravel grains in the binder while the fracture in the Marshall bodies prepared from the mixtures K III and K IV, i.e. the bituminous binders prepared for the process according to the invention, went flat and went through the grit grains and binder, documenting the extremely good adhesion of the bituminous binder to the gravel seeds and is explained by a salt bridging between the polyolefin / naphthenic compounds and the rock surfaces.

Further, measurements of the coefficient of friction carried out on the pavement with an RRL pendulum device according to BS 812: 1967 and SNV 640.511, for the sections bonded with the process according to the invention, gave a somewhat better grip (mean of a large number of measurements SRT 63) than for those with bitumen P 120 without synthetic material as a binder at a binder content of 7% sections, and for those sections made with bitumen without synthetic material (average of a large number of measurements SRT 61).

. . The measurement results obtained from studies of Mar shall bodies and drill cores are listed in the following Tables 4 and 5. Here, measurement values obtained under AB 0/12 which were obtained 15 141969 on Marshall bodies which were prepared using bitumen without synthetic material, and below AB 0/12 K measured values measured on Marshall bodies made of a material whose mineral aggregate was the same as that used in bodies AB 0/12 however, in Marshall bodies AB 0/12 K, a polyethylene / bitumen blend of 20% polyethylene content was used as the binder. The binder content was also found in Marshall bodies AB 0/12 E 71. In Table 5, measured values were determined under KI, K ΙΪΙ and KV, which were determined on Marshall bodies and drill cores, the Mar-shall bodies being each made out from one of the three on the test section for construction, bituminously bonded building materials, the mineral aggregate of which in all three cases were identical, the values of the building materials bound with bitumen without synthetic material, below K III the values of the a bituminous binder with a polyethylene content of 25% bonded building materials and below the KV values of those with a bituminous binder with a polyethylene content of 15% bonded building materials. The binder content of these building materials remained at 6.5%.

Marshall bodies and drill cores of materials bound with bituminous binders prepared by the process of the invention also showed far better conditions in studies simulating extreme climatic conditions than building materials bound with bitumen without synthetic material.

Thus, of the three materials mentioned above, as combs for incorporation in the aforementioned test section, Marshall bodies made underwent various special investigations. In the first of these studies, the test bodies were affected by a 5-fold repeat cycle: a) Storage in saturated aqueous saline solution at a temperature of 20-22 ° C for a period of 15 hours.

b) Storage in air at a temperature of 20-22 ° C for a period of 9 hours.

c) Cold air storage at -20 ° C (climate room) for a period of 15 hours.

d) Storage in air at a temperature of 20-22 ° C for a period of 9 hours.

Immediately in connection with the last cold air treatment, the compressive strength was determined by means of a steel piston with a diameter of 50 cm and broken edges, using a shock speed of 25 mm / minute. The following values were obtained: 16 141969

Material Compressive strength Compressive strength for 50 cmz K I over 10,000 kp over 200 kp / cm2 2 K III over 10,000 kp over 200 kp / cm 2 KV over 10,000 kp over 200 kp / cm

In a further experiment, in addition to the above-mentioned cycle, a 7 hour storage at room temperature was inserted, and then the compressive strength was determined, giving the following values.

Material Compressive strength Compressive strength for 50 am K I 4000 kp approx. 80 kp / cm2 K III 6,150 kp approx. 123 kp / cm2 K V 6.350 kp approx. 127 kp / cm2 For further investigation, the Marshall bodies were subjected 5 times to a cycle consisting of storage in cold air at -20 ° C for 15 minutes and associated storage in air at a temperature of 20-22 ° C. for 33 hours. Following the last cold treatment, the Marshall bodies were stored at 20-22 ° C and then the compressive strength was determined. The following values were obtained:

Material Compressive strength Compressive strength for 50 citr K I 3,800 kp approx. 76 kp / cm2 K III 6,350 kp approx. 127 kp / cm2 K V 6,400 kp approx. 128 kp / cm2

Finally, the compressive strength was also determined on drill cores with a diameter of 15 cm and a height of 5 cm after 12 times passage of the cycle at a storage of 12 hours at 60 ° C and a closed storage of 6 hours at ^ -20 °. C, whereby the bodies bonded with a bitumen with 15% 1 s polyethylene proportion exhibited a compressive strength of 1250 kp at a load with a piston having a cross-sectional area of 50 cm, and with bit cores bonded with bitumen having a content of 25% polyethylene, a compressive strength of 1500 kp could be obtained. With normal bitumen bound drill cores had already been broken due to the alternating temperature with no effect other than their own weight.

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Table 5

Study of Marshall bodies and cores Material KIK III K V

-—--—--- '3 ~

Mean Density Marshal Body 2,405 2,298 2,350 g / cm

Average density drill cores 2,437 2,303 2,364 g / crn ^

Average crude density 2,504 2,461 2,490 g / crn ^

Cavity Marshall 4.0 6.6 5.6 vol%

Cavity drill core 2.7 6.4 5.0 vol%

Compression ratio 101 100 101%

Load after Marshall 840 1 830 1 750 kp

Float after Marshall 21 16 17 1/10 mm

Fracture strength at 20 ° C 830 1 780 1,520 kp

Flow at breaking strength 29 22 22 1/10 mm _6.730 9 850 ^ 600 ^

Example 3 In accordance with Experiment 3 of Example 1, a bitumen-polyethylene pulp was prepared by mixing polyethylene waste and road building bitumen B 80 in the 50:50 blend ratio, the homogenization of this pulp being carried out in a blending vessel at 290 ° C for 60 minutes. As a result, after 60 minutes, the power consumption of the mixing plant's engine compared with the measured current value after 30 minutes had decreased by 30%. This implies a marked decrease in viscosity. Following this homogenization of the pulp, the polyethylene content of the pulp was reduced to 12% by the addition of additional hot road building bitumen B 80.

The 12% bitumen-polyethylene pulp thus obtained was added as a binder in an amount of 6% a usual rock material which had been preheated to produce paving asphalt pavements. Of the thus obtained road-building material, Marshall bodies were prepared and subjected to the usual tests of Marshall stability and fracture strength.

For comparison, similarly, from the same rock material using 6% road building bitumen B 80 as a binder, a road building material was also prepared from which Marshall bodies were also prepared, which were subjected to the same studies as those using the said bitumen polyethylene-19. 141969 binder made Marshall bodies. The Marshall bodies were manufactured in accordance with the standards of 2 x 50 strokes.

The measurement of Marshall stability was in accordance with the standards at 60 ° C. The measurement of the breaking strength was in accordance with the norms at four different temperatures, namely at -25 ° C, 0 ° C, + 25 ° C and + 40 ° C.

To carry out this measurement program, three individual measurements were always carried out under the same measurement conditions, and the mean values obtained from these single measurements were obtained. The average measured values thus obtained were as follows:

Marshall Stability a) Road construction material with Load 1500 kg 6% binder of Liquid 39 1/10 RAN 88% B80 + 12% polyethylene B / F 38.1 b) Road construction material with Load 1150 kg 6% binder of Liquid 47 1/10 ram 100% B80 B / F 25.1

Fracture strength a) Road construction material with 6% binder of 88% B80 + 12% polyethylene -25 ° C_0 ° C _ + 25 ° C 4-4 Q ° C · 47.6 45.1 16.6 6.8 kg b) Road construction material with 6% binder of 100% B80

-25 ° C 0 ° C + 25 ° C ..... + 40 ° C

"". -, --............ II vm II., '.. II I, 47.5 43.0 8.8 2.6 kg

Example 4 In accordance with Experiment 5 of Table 3, a bitumen-polyethylene pulp was prepared by mixing polyethylene debris and road building bitumen B 120 at a mixing ratio of 30:70, with the homogenization of this mass being carried out in mixing vessel at 290 ° C. 60 minutes. As a result, the power consumption of the mixer motor after 60 minutes of homogenisation, compared with the current value measured after 30 minutes, had decreased by 20%. This is a significant decrease in viscosity. Following this homogenization of the pulp, with the addition of additional hot road building bitumen B 120 pulp with a polyethylene content of 12% and 19% was prepared. The 12% and 19% * bitumen polyethylene masses thus obtained were each added, in an amount of 5.5%, as a binder for a previously stone-heated asphalt road paving material which had been previously heated. .

Marshall bodies were prepared from the road building material thus obtained and subjected to the usual fracture strength tests. For comparison, similarly, from the same stone materials and using 5.5% of road building bitumen B 120 as a binder, a road building material was also prepared from which Marshall bodies were also prepared, which were subjected to the same studies as those using the above-mentioned bitumen. polyethylene binder made Marshall bodies.

The Marshall bodies were manufactured in accordance with the standards of 2 x 50 strokes.

The measurement of the breaking strength was in accordance with the norms at four different temperatures, namely at -25 ° C, 0 ° C, + 25 ° C and + 50 ° C.

To carry out this measurement program, three single measurements were always made under the same measurement conditions, and the mean values obtained from these single measurements were obtained. The average measured values thus obtained were as follows:

Fracture strength a) Road construction material with 55% binder 88% B 120 + 12% polyethylene

-25 ° C 0 ° C + 25 ° C + 50 ° C

44.6 41.8 9.1 2.7 kg 21 141969 b) Road construction material with 5.5% binder 81% B120 + 19% polyethylene

-25 ° C 0 ° C + 25 ° C + 50 ° C

42.9 42.6 13.6 4.0 kg b) Road construction material with 5.5% binder 100% B120

-25 ° C 0 ° C + 25 ° C + 50 ° C

45.2 41.1 7.2 1.9 kg

Example 5 In a heated container equipped with fast-running agitator which allowed intensive processing of the container contents, a mixture of 88 parts of road building bitumen B100 and 12 parts of a predominantly cif solid polyethylene waste consisting of polyolefin material at 290 ° C was homogenized. After 30 minutes, there was a homogeneous-looking mass. Then the homogenization was continued at the same temperature for another 30 minutes. At intervals of 5 minutes, samples were taken from the pulp and their viscosity was determined by means of an outlet viscometer which contained 1 liter of pulp and whose outlet bore had a diameter of 6.5 mm.

Prior to the measurement, the sample was brought to 190 ° C. In the first measurement there was thus an expiry time of 280 seconds, in the second measurement an expiry time of 280 seconds, in the third measurement an expiry time of 290 seconds, in the fourth measurement an expiry time of 265 seconds, in the fifth measurement an expiry time at 240 seconds, at the sixth measurement an expiry time of 235 seconds and at the seventh measurement an expiry time of 225 seconds. Then, the homogenization treatment was discontinued.

The bitumen-polyethylene pulp thus obtained was added as a binder in an amount of 6% to a conventional stone material which had been preheated to produce paving asphalt pavements. Of the road building material thus obtained, Marshall bodies were prepared in the usual manner using 2 x 50 strokes. These Marshall bodies were examined

Claims (5)

141969 22 usual way of Marshall stability. The material showed a Mar-shall load of 1160 kg and a float value of approx. 53 x 1/10 mm. In comparison, from the same rock material and the same charge of the previously used road building bitumen BIOO (which thus had no polyolefin additive), a road building material which was previously processed into Marshall bodies was prepared in the usual manner. On these Marshall bodies, a Marshall load of 700 kg and a float value of 100 x 1/10 mm could be measured. Claims. A process for the preparation of a bituminous binder for building and coating materials containing, as an aggregate, disperse solids, predominantly of an inorganic nature, such as shards of gravel, gravel and sand, and particularly serving to produce compression and mold layers, wherein bitumen and a polyolefin material to form the binder with stirring are homogenized with each other in a hot mixing plant during melting and dissolving of the polyolefin material, characterized in that the bitumen and polyolefin material used as polyethylene and / or polypropylene at a temperature between 260 and 310 ° C, preferably at ca. 290 ° C, is mixed or homogenized in the hot mixer so long as a homogeneous binder that a distinct viscosity drop for this binder occurs. Process according to claim 1, characterized in that the polyolefin material and the bitumen are homogenized in the hot mixing plant until the viscosity of the pulp has decreased by 1/5 to 1/10 of the pulp viscosity immediately after the dissolution of the polyolefin material in the bitumen. Process according to claim 1 or 2, characterized in that the polyolefin material is added to the bitumen in an amount that is at least 10% of the bitumen amount. Process according to claim 3, characterized in that the bitumen for the molecular degradation homogenisation is added to polyolefin material in an amount between 30 and 100% of the bitumen content. Process according to claim 1 or 2, characterized in that the homogenized bitumen / polyolefin mass is added to additional bitumen.