DE2015572B2 - BITUMEN MODIFIED BY MIXING WITH AN ETHYLENE BLENDING POLYMERISATE AND ITS USE - Google Patents

Description

Such a binder results in elastic constructions with less deformation while maintaining the same stability and have better relaxation! show little signs of fatigue and where signs of aging occur greatly reduced by modification.

Especially in the case of a strengthened asphalt layer, in which the reinforcement from woven fabrics, knitted fabrics from monofilaments ^ multifilament threads ^ chmadie which contained various bitumen as a binder. For this purpose the binders were made mixed with:

1. 50% limestone filler,
specific weight 2.60,
Bitumen number 42 to 50;

2. 50% fly ash filler,
specific weight 2.15,
Bitumen number 60 to 65;

3. 40% fly ash filler,
specific weight 2.15,
Bit number 60 to 65.

The ductility was measured in cm at 25 ^° C. and determined in an electrically operated ductility measuring device.

The following results were obtained:

to bitumen 80/100 and to a commercially available latex modified bitumen. That in these and the following experiments used copolymer was provided, not otherwise specified, a copolymer of ethylene, butyl acrylate, styrene Äthylhexylacry'lat and having a viscosity of 350,000 cps at 18O ⁰ C, which melts at about 160 ⁰ C.

, jr- --- · - - ^The penetration values and the softening points

len ribbons or fibers made of polyamide, polyester, _Io were determined directly on the bitumen. The Duk-Glas consists of polypropylene or polyethylene, the tilitätstest was carried out on asphalt mixtures, properties of the bitumen according to the invention are we-. . . . .

essentially for the duration of the interaction of such reinforcement, which, if desired, continues can be impregnated with a resin. Particularly good results are achieved when the reinforcing Material contains polypropylene or polyethylene, especially if it is polypropylene or polyethylene is impregnated with an adhesive.

In order to achieve further bitumen properties, the bitumen modified according to the invention can be fine Sand, for example with a grain size up to a maximum diameter of 0.5 mm, and / or mixed with a filler and this mixture on a reinforcing material that has been pretreated with a resin can be applied.

The bitumen according to the invention is also particularly suitable for the production of mixtures bituminous binders and minerals used at moderate temperatures for road construction and for Building a layer of asphalt on a moving surface and a surface with subsidence expected can be used. Mixtures used at moderate temperatures can be, for example mixtures that can be prepared and used at 40 to 100 ° C, namely follow the movements of the subsoil, and this reduces the formation of cracks. Another advantage of the bitumen according to the invention is that using it obtained asphalt mixtures to be used at moderate temperatures, even under load maintain their structure and can withstand greater tensile stresses.

The invention therefore also relates to the use of the above modified bitumen for Production of asphalt layers, preferably with a reinforcement made of a synthetic textile material, in particular polypropylene or polyethylene, which can be impregnated with a resin, used in the asphalt layer.

In the manufacture of a modified bituminous binder intended for asphalt mixes to be used at high temperatures, the bitumen is generally rated at 4 to 25 percent by weight ethylene copolymer mixed.

To produce a modified bituminous binder that is used at moderate temperatures the bitumen can be mixed with 4 to 45 percent by weight of the copolymer.

binder Duktili Pcnctra Softening activity tionwcrt Point 1. Bitumen 80/100 40 77 44.1 Bitumen latex 45 90 47.1 Bitumen 80/100 56 62 47.8 4- 5% mixed polymer 2. Bitumen 80/100 12th 82 44 Bitumen latex 22nd 90 47.1 Bitumen 80/100 32 73 48.3 5 + 5% mixed polymer 3. Bitumen 80/100 23 82 44 Bitumen latex 27 90 47.1 Bitumen 80/100 44 73 48.3 + 5% mixed polymer

Comparative experiments example 1

The ductility, the penetration value and the softening point of According to the invention modified bitumen in comparison From the above values it can be seen that In terms of ductility, the bitumen modified according to the invention is superior.

Example 2

In order to investigate the resilience or rebound effect of test pieces, these were the exposed to the following stress tests:

The test pieces were loaded for 1 minute at 6.4 kg / cm ² at 35 and 55 ^L 'C using a mold which had a surface area of 5 cm ² and was loaded with 32 kg in total. After measuring the impression to exactly 0.01 mm, the load was removed and the remaining impression was measured after a rest period of 15 seconds. The rebound was

from

expresses as a percentage of the total impression.

The asphalt mixes used for the test pieces had such a grain

5 6

size that 0% on a Dutch standard. A series of tests at 10 ³ C was also carried out

sieve no. 0.60 and 25% carried out on a Dutch.

Standard sieve no. 0.42 remained. The content of the following results were found:

Limestone filler was 8% and the bituminous content --—

Nose binder 7.5%, calculated on 100% mineral binder 6 kg 7 kg 8 kg 10 kg

material. "

In use, the various bituminous _Bitumen n 80/100 0 35 0.3 0.5 0.70

Binders were found the following _{results- '1 Ί Λ} . _Λ,.

posed: bitumen 1.0 1.2 1.4 1.6s

When using the various bituminous io + -> ο Miscn-

Binder was solid polymerizat the following results

provided: bitumen 1.0 1.23 1.5 1.80

At 35 ⁰ C + 7.5% mixed

^With ■ "* - polymer

Bitumen 80/100 48.5% _l5 ^- Beisoiel4

Bitumen latex 50% B e ι s ρ ι e ι 4

Bitumen 80/100 + 5% mixed of similar asphalt mixtures with bitumen

polymer 71.5% 80/100 or bitumen + 5% mixed polymer as

ß _{ei 55} O £ binders were the Marshall stability, the flow

Ritnmpn sn / inn τ; <· ■ ^{20 value and the} stiffness values, also according to standard

Bitumen 80/100 35 dard Marshall tests, determined.

Bhum ^ to / ii ΐ 5% mixed ^ ' ° " ^{The S} !, F ^ ^{is byCh} *«' ⁰ ^ * ^GlcichU "^

50.5% polymer ^represents S ^estellt: _StabiIität

, _c stiffness = - ■

^{Example3 5 w} flow value x 1.6

Asphalt mixes with different The following values were determined:

bituminous binders and made from them

Test beams manufactured, which after compaction have a binder stability flow value stiffness

Length of 35 cm, a width of 5 cm and a height of 30 -

of 7 cm. The bars were at a temperature

temperature of 135 ° C by means of a Marshall compression bitumen 80/100 517.5 kg -, 76 mm j00

equipment installed for this purpose, bitumen 544.5 kg 2.91 mm 299.4

condensed. + 5% mixed

The grain size of the asphalt mix required for the 35 polymer
Tesl bar was used was such that 0%

the asphalt mix on a Dutch Aus den E-; It follows that the inventive

Standard sieve no. 11.2 and 32% on a lower binder with the same stiffness larger

Country standard sieve No. 5.6 remained. Which has stability and a higher flow value.

Limestone filler content of the mixture is 6.5% and 40 RlS

the content of binder 6%, calculated on 100% ^e ' ^sp

Mineral material. The following tests show that the asphalt

The beams were then layered in a Marshall with the binder according to the invention

Search press checked, which are more resistant to bending loads with an electronic one. Man before

Recorder was connected. 45 turned bitumen with different penetration

A series of tests was carried out at 18 ° C. evaluate with filler and / or fine sand

The results were expressed in mm deflection with a maximum grain size of 0.5 mm and various loads in kg / cm ² . substances in various proportions with respect to the The following results were obtained: Bitumen added.

50 The mixtures were at temperatures of

Binder 5 kg 6 kg 7 kg 135 ° C on an impregnated polyester fabric with a

Mask surface of 0.3 mm "applied. The

_ .. ογ, / ιπλ λ ο ιλ ι-, bituminous mixture was applied to

Bitumen 8D / 1DU D, 8 1.0 1.3 _{the fabric with} crushed sand with a grain size of

Bitumen 80/100 0.8 1.1 1.4 ₅₅ sprinkled with a maximum of 2.5 mm. The total thickness of the

+ 5% mixed polymer search pieces were 1 cm.

Bitumen 80/100 1.25 1.55 1.9 The following compositions were made

+ 10% mixed polymer tested:

binder composition B. ! in parts by weight D. E. F. G A. C. 1 Bitumen 80/100 1 1 1 - 1 1 Bitumen 180/210 - 0.075 1 0.075 - - - Mixed polymer 0 ] 0.1 - - 1 - Fine sand - 1 1 1.25 1.5 1 1.25 ink pen 1.5 1

Columns B and C are preferred.

The Tesl gaps were measured in terms of their flexural strength tested at 15 ° C, with only the samples without copolymer cracking even with slight bending showed.

The samples were 65 hrs vertically. Suspended at a temperature of 50 ⁰ C. In contrast to the samples with the unmodified bitumen, which flowed completely off the reinforcement material after a short time, no deformation (flow) occurred when mixtures of bitumen and a copolymer according to the invention were used.

It was also found that the flexibility when storing the samples for a long time in a very concentrated Salt water at a temperature of 35 ° C did not decrease.

The above tests show the effect of the bitumen modified according to the invention for asphalt mixtures, intended to be used at high temperatures.

Example 6

In order to show the influence of the binder modified according to the invention when used in asphalt mixtures which are used at moderate temperatures, the following composition was prepared: 7.4 percent by weight copolymer, 14.8% bitumen 80/100 and 77.8% one Tar asphalt bitumen mixture. The copolymer was a copolymer of oxidized polyethylene wax, ethyl acrylate and styrene with a viscosity of 35,000 centipoise at ISO ⁰ C and a melting temperature of about 130 ⁰ C. The oxidized polyethylene wax used as the starting material was an oxidized, emulsifiable polyethylene with a molecular weight of approximately 1200, a melting point of 93 to 96 ° C, an acid value between 25 and 35 and a saponification number of 45 to 55. the copolymer was added to the bitumen after it had been heated to 16O ⁰ C, the mixture at a Teerasplr.iltbitumen Longing for a temperature of 70'C !! was added to the melt with stirring. After mixing, the temperature of the mixture was 98 ".

In the following comparative tests, the sample is Λ an asphalt mix with a bituminous binder, the 100 "" tar asphalt bitumen mix

ίο contained. The asphalt mixes compared had apart from the bituminous binder, the same composition.

The mineral material used in these showed, using Dutch standard

seven following sieve analysis:

Residue on sieve no.5.6 -

Residue on sieve no. 2.8 31 ", ',

Residue on sieve no. 1.4 19 ",,

so residue on sieve no. 0.60 15 ",,

Residue on sieve no. 0.42 9 ""

Residue on sieve no. 0.30 4 ""

Residue on sieve no. 0.15 9 ""

Residue on sieve no. 0.09 6 ""

Residue on sieve no. 0.075 3 ""

Filler 4 " _o

This material was at 90 ° C with 7 ⁿ _u, calculated on the total amount of the above-described

Binder, mixed.

Cylindrical cores were prepared therefrom then by compacted in the same manner as is customary for the standard Marsha'l-stability tests at 70 or 9O ⁰ C.

According to the standard Marshall test, the cores were examined for their stability and their flow value, after they had been kept for 24 or 48 hours after compaction, the last 2 hours in Water. The following results were obtained:

sample

Compression Retention stability Flow value temperature Time CC) (Hours.) (kg) (mm) 70 24 40.8 2.1 70 48 48.5 2.0 90 48 70.4 1.7 70 24 75 1.8 70 48 85 1.6 90 24 117 1.6

A.
A.
A.

According to the invention
According to the invention
According to the invention

Claims (3)

1 2 and ζ. B. under the influence of sea water possible claims: show little Alterur.gsphänomene. It is also known that in use 1. By mixing with an Äthylenmisch- of bitumen at higher temperatures, example polymer modified bitumen, characterized 5 as above 190 ⁼ C or with prolonged heating of that the bitumen with 4 bitumen at lower temperatures, for example up to 45 percent by weight of a copolymer above 160 ⁰ C, the penetration value is lowered, of ethylene or oxidized polyethylene wax There is therefore a need for bitumen with high properties with one or more acrylate and / or elastic properties combined with lower methacrylate esters and styrene, in which the ge io of plastic deformability. weight ratio of styrene to acrylate between For this purpose, attempts have been made to mix mixtures of 95: 5 and 30:70, and in which at least bitumen and latex and / or latex compounds 10 percent by weight ethylene units contain. Mixing and processing bitumen have been mixed. with the appropriate latex and / or latex 2. Modified bitumen according to claim 1, data but to compounds 15, beidurch characterized at high temperatures that ^ ias bitumen with 4 over 200 ⁰ C, held to play to homogenization-25 weight percent to achieve the interpolymer overall organization and to has been mixed by the vulcanization. properties of latex at these high temperatures 3. Use the modified bitumen after making use of the doors. However, as before Claims 1 and 2 for the manufacture of 20 set forth above, the use of such er-asphalt layers. elevated temperatures lead to a decrease in the Penetration values and an irregular change change in the overall complex of bitumen properties.
25 It is also known the properties of bi It is known that the plastic-elastic natural gymnastics by mixing bitumen with synthetic »To modify the properties of bitumen through the influence of acidic polymers. So is from the In general, according to different weather German Patent No. 7 52 948, a bituminous one conditions are subject to change, including coating agent known, which consists of a bitumen through The release of asphaltenes and / or the solution with additions of aliphatic and aroma changes the properties of these asphaltenes and table polymers. From the Öster-Maltene. The penetration value of bitumen can be rich in patent specification 2 48 109 molding compounds are thereby reduced, or the material is made from bitumen and ethylene copolymers Brittle and less able to relax. Ethylene, vinyl ester and acrylic compounds are known. Under Maltenen are components of the bitumen to 35 In the British Palentschrift 11 37 545 are Formverstehehen, those in low-boiling, non-masses of bitumen, ethylene copolymers and dissolve aromatic solvents, whereas the polyisobutylene described. The US patent Insoluble constituents are called asphaltenes. 34 42 881 concerns bitumen compounds with additives It is also known that bituminous bound ethylene-vinyl acetate copolymers and the US constructions, which is not continuously described by the 40 patent specification 32 49567 ßitumenmassen are contaminated, earlier signs of aging with the addition of ethylene-acrylic ester copolymers as such constructions that continuously sowed. From British Patent 8 53 525 are be charged. The bituminous masses, which are not permanently contaminated, are known for road construction Because internal constructions are subject to a mixture of tar and styrene plastic as a binding agent Deformations that are not caused by copolymers! contain. show external deformations and which is a result of none of these cited references, however Flowing of the bituminous binder are. This can be seen under what conditions bitumen brings among other things a problem at the start and at lower temperature without unfavorable Becin- Runways for aircraft and dike coverings, enhancing its properties with a mixed the tracks and coverings of which cannot be continuously modified by the polymer, are burdened with themselves. According to the invention this is made possible by mi The fact that the plastic deformation of see modified with an ethylene copolymer Bitumen and accordingly also that of ornamented bitumen, which is characterized in that Asphalt in strong relation to the elastic property- the bitumen with 4 to 45 weight percent of one shafts, leads to deformed 55 copolymers of ethylene or oxidized at dike banks malionen without the possibility of relaxation. Polyethylene wax with one or more acrylate In the case of waterproof and / or corrosion-resistant Ab- and / or methacrylate esters and styrene, in which the seal with asphalt and / or of asphalt construct- weight ratio of styrene to acrylate between in canals and waterways, on dams is 95: 5 and 30:70, and in which at least and dykes and embankments that contain 60-10 weight percent ethylene units, subject to corrosion, it is necessary that one has been mixed. To have asphalt mixture which, because of its elasticity, is characterized by the bitumen according to the invention. the connection of the lower layer with the lower layer ensures that it works well as a bituminous binder Grund secures and is able to deformations in mixtures with mineral substances that have been proven follow. For this reason, the asphalt should be used as a surface course at high temperatures, especially have poor flow properties, so that only special on runways for aircraft a small internal plastic deformation occurs, and as asphalt layers on dams and If desired combined with high tensile strength, dykes can be used. Using a