Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C7/00—Coherent pavings made in situ
  • E01C7/08—Coherent pavings made in situ made of road-metal and binders
  • E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
  • E01C7/26—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre
  • E01C7/265—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre with rubber or synthetic resin, e.g. with rubber aggregate, with synthetic resin binder
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
  • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
  • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
  • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
  • E01C19/104—Mixing by means of movable members in a non-rotating mixing enclosure, e.g. stirrers

Definitions

• the invention is a novel covering, especially S tra modebelag consisting of mineral fillers, kauregeneraten and a binder based on bitumen. Furthermore, the invention relates to a method for producing this covering and its use for sound absorption, in particular of roadways.
• a further object of the present invention was therefore to introduce rubber rain rates in a percentage higher than 5% in road surfaces, without the quality of these road surfaces thereby being impaired.
• DE-OS 21 19 178 it is known to mix the filler and binder after heating rubber vulcanizate particles in order to adhere to the heated rock particles as a result of partial thermal change or decomposition.
• This addition of a total of 3% by weight of thread-like and powdery rubber vulcanizate leads to deteriorated properties of the pavement.
• DE-OS 22 53 495 describes a process for producing a covering layer in which a mixture of grit and bituminous binder is applied to the substructure and this supporting structure is then solidified by mortar penetrating into the cavities, in which fillers or elastomers stiffening the bituminous binder be added.
• Rubber, vinyl polymers and the like can be considered as elastomers. These materials are particularly suitable for sealing coverings, but do not fulfill the above-mentioned tasks of utilizing high amounts of rubber regeneration and having a sound-absorbing effect.
• thermoplastic polymers Since it is a question of thermoplastic polymers, processing is relatively easy, but only 60-100% by weight of bitumen, based on the weight of the polymeric constituents, may be added to this mixture. Rubber rain rates cannot be processed here. Due to the relatively expensive starting materials, this process can only be used to a limited extent and for special purposes.
• Oxidized bitumen is not compatible with thermoplastic styrene-butadiene rubbers, so that only individual types of oxidized bitumen can be satisfactorily modified with the teleblock copolymers. While Delme recommends the modification of bitumen with radial teleblock elastomers for various areas of application, such as bitumen felt panels, joint seals, noise insulation and underbody protection in the automotive industry, as well as pipelines and underground cables, he makes repeated attempts to modify bitumen for road construction with rubber additives , as disappointing. So far, the difficulties and increased costs of mixing bitumen with rubbers have not been justified by a corresponding quality improvement.
• bitumen which contains 5-25% radial teleblock copolymers, these having to be hot homogenized with the bitumen, is suitable for absorbing 5-30% rubber regeneration in addition to mineral fillers and leads to coverings, especially road coverings, that meet all quality requirements.
• these coverings are suitable for supporting noise control at the source by reducing the rolling noise and also less the engine and driving wind be reflected in noise and swallowed instead.
• Copolymers of butadiene and styrene in a ratio of 75/25 to 60/40 with a molecular weight of 50,000-600,000 have proven particularly useful as radial teleblock copolymers.
• All distilled standard bitumens of classes B 25 - B 200 are particularly suitable as bitumen. These bitumen qualities are compatible with the radial teleblock copolymers and can be homogenized at temperatures of 180 - 220 ° C, preferably 180 - 200 ° C, within 0.3 - 2 hours in a high-speed mixer.
• the rubber regeneration and minerals can be mixed in the usual way, it has proven useful to preheat the minerals and add the rubber regeneration at room temperature. The mixtures obtained in this way are processed further to the covering in a manner known per se.
• high-speed mixers are required, rotor-stator systems in particular having proven themselves.
• the new coverings are particularly suitable as road coverings, from which a high level of sound absorption is expected. Due to the good mechanical properties, they can also be used for bridge plates in all-steel construction (orthotropic plates), as described for example in DE-OS 23 04 004. Furthermore, these coverings can be used for schoolyards, aircraft taxiways etc., since it has been found that the compatible components bitumen and radial teleblock Copolymers according to the invention are capable of absorbing and binding the most diverse types of mineral fillers and the most varied amounts of rubber regeneration when hot homogenized. It therefore depends on the respective intended use which bitumen quality is modified with the radial teleblock copolymers and then mixed with the desired amount of rubber regenerates and minerals to form a covering.
• a great advantage of the process according to the invention is that the uneconomically long mixing times in the temperature range of 180-220 ° C. can be kept short, namely 0.3-2 hours, preferably 0.8-1.5 hours. Longer mixing times are not only uneconomical, they also change the bitumen and the copolymer negatively. The bitumen hardens and the copolymers are negatively changed by chain breakage.
• the process according to the invention can be carried out either batchwise or continuously. By connecting several rotor-stator system mixers in series, the mixing time can be shortened further if desired. It is crucial that there is sufficient homogenization.
• 3 t of binders are produced from 90% bitumen B 200 or bitumen B 80 and 5% of the radial teleblock copolymers (Solpren 411 and Solpren 1205, butadiene-styrene ratio 75/25, molecular weight) 140,000).
• the mixing temperature was 190 and 200 °, respectively, the mixing time was 1 hour. Homogenization after 1 hour was complete in both cases.
• the other measured values for the softening point were 94 and 99 ° C, respectively.
• F max (N) was 1.25 and 3.67 and the permanent elongation after 24 hours was 18 and 10 mm.
• a device was installed on the feed line to the binder scales, which allowed the binder to be pumped directly into the weighing device.
• the elevator was prepared for the filling task in such a way that the rubber regeneration of the binding agent-mineral mixture could be added via a special weighing.
• the finished mixtures were partly poured into measuring plates measuring 50 x 50 x 4 cm and compacted under the support of a wooden plate using a vibrating roller, and in some cases they were also used to install a surface covering a road surface of approx. 40 m in length and approx. 3.75 m in width applied with the help of a road paver, these road surfaces were previously milled 4 cm deep.
• a VAT adhesive S was sprayed onto the milled surface in an amount of approx. 1 kg / m 2 and then the asphalt was applied with the paver (ABG-Titan 350 S).
• a cross profile measurement, a grip measurement with a pendulum device and comparative sound measurements were carried out on this surface. Installation errors on the surface could only be eliminated above a temperature of approx. 170 ° C, because the elastic asphalt cannot be processed due to the high viscosity of the binder. Such bumps can be corrected by means of electrically heated steel plates.
• the transverse profile measurement on the test pavement of a heavily used road showed that within 30 days the difference was not more than 0.1 to 0.3 mm at two different points.
• the grip measurement with the pendulum device was carried out according to "Work instructions for combined grip and roughness measurement with the pendulum device and the flow meter ", Research Society for Roads, 1972 edition. The results were considerably better than the values of a comparable asphalt concrete 0/8.
• Comparative sound measurements on the surface according to the invention compared to conventional surfaces showed that the surface according to the invention significantly reduces the frequencies above 800 Hz, not only by lower rolling noise at different speeds, but also by swallowing the sound from the other driving noises and Engine noise comes from.
• Asphalt mixtures with variable additions of "SBR-Latex” also showed no improvement in the abrasion values compared to other additives.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Road Paving Structures (AREA)
• Paints Or Removers (AREA)
• Building Environments (AREA)
• Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
• Soundproofing, Sound Blocking, And Sound Damping (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

Country Status (5)

Cited By (7)

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Citations (8)

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• 1980
  • 1980-10-03 DE DE19803037390 patent/DE3037390A1/de not_active Ceased
• 1981
  • 1981-09-21 US US06/304,185 patent/US4381357A/en not_active Expired - Fee Related
  • 1981-10-01 DE DE8181107813T patent/DE3173640D1/de not_active Expired
  • 1981-10-01 AT AT81107813T patent/ATE17758T1/de not_active IP Right Cessation
  • 1981-10-01 EP EP81107813A patent/EP0049485B1/fr not_active Expired
  • 1981-10-02 JP JP56156296A patent/JPS57102951A/ja active Pending

Patent Citations (8)

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