DD213680A1 - BITUMINOESES MIXTURE FOR STREETS - Google Patents

Abstract

The invention relates to a bituminoese mix for the manufacture, repair, maintenance and care of Straßenbelaegen based on waste products. It is constructed on the basis of road-breaking material and according to the invention contains 90 to 99.8% by weight of road breaking, 0.1 to 4% by weight of chloroparaffin with a chain length distribution of C deep 12 to C low 20 and a chlorine content of 30 to 42 Ma. -% and 0.1 to 6% by mass of fuel with a grain size <equal to 0.09mm.

Description

Bituminous mix for road surfaces

Field of application of the invention

The invention relates to a bituminous mix for the manufacture, repair, 'maintenance and care of road coverings based on waste products.

Characteristic of the known technical solutions

It is known to produce a bituminous mixture based on minerals of different particle sizes and road bitumen, cut bitumen, cold bitumen, bitumen emulsions or tars.

In the renovation of road surfaces, as a by-product, aged bituminous road-breaking material, which is usually discarded, is produced. In addition to economic losses, there are also severe environmental pollutions. A tilting or landfill of these waste materials is not responsible for reasons of global oil shortage. Therefore, there have been concrete and well-founded demands for a reuse of the aged bituminous roadbreaking material for some years.

Asphalt recovery processes have been proposed for regeneration of asphalt wastes used in maintenance and repair operations.

In principle, a distinction is made between the following reuse methods that can be used:

1. The milling of old surface layers and the installation of the crushed material with the addition of bitumen emulsion or cement with sand on base courses or fastenings for subordinate traffic areas.

2. The breaking up or milling of the old road structure and its restoration by processing and incorporating the crushed material at the point of departure, with or without the addition of related aromatic oils.

3 · The breaking up or milling of old road construction layers and recycling of the crushed material into the production cycle of bituminous mixtures.

As a binder, the break-away materials contain bitumen, which is embrittled by the action of air, light and water and by mechanical stress. This Yersprödung- is also recognizable by the change in the ingredients of bitumen. The hardening and embrittlement of the bitumen is caused by a decrease in the oils and an increase in the concentration of asphaltenes. For regeneration, related, non-paraffinic, high aromatics oils have been used which have a softening effect on the binder *

The large-scale utilization of roadworking material is so far only in the production of mastic asphalt, with relatively small amounts are added during mixing of the new Gußasphalta for reasons of quality reduction.

Such mixtures are used only for remedial work in the context of maintenance.

The reuse of the resulting bituminous drifting material assumes that either the material has not aged too much and "the defects in the cracked cover layer are not due to an insufficient bearing capacity of the construction or that the waste expensive and not in the required amount available Straßenbaubitumen , Cut-backs bitumen, cold bitumen, bituminous

emulsions, tars, other binders or aromatic, related, non-paraffinic oils must be used. Use of such expensive and insufficiently available regenerants does not improve the economics of such materials.

Object of the invention

The aim of the invention is a bituminous mixture based on aged bituminous road-breaking materials and additives for the manufacture, repair, maintenance and care of road surfaces, which eliminates the disadvantages of the prior art and substituted the previously used for regeneration binders or aromatic oils can.

This mix is to meet the quality requirements imposed on a bituminous road Baumischgut. The mix should be constructed using secondary raw materials. In the process, secondary raw materials that have been driven to waste, used and are no longer usable in terms of material and energy, are to be used as regenerants for bituminous road-breaking materials. This makes it possible to save the road construction bitumen and aromatic oils previously used for this purpose for regeneration and elsewhere to provide a more meaningful use while eliminating the environmental impact of pollutants due to the no longer necessary dumping on landfills or the no longer required dump storage both of bituminous roadbreaking material as well as using waste products

Explanation of the essence of the invention

The invention has for its object to develop a bituminous mix for the manufacture, repair, maintenance and care of road surfaces based on aged bituminous roadbreaking materials, wherein

as regenerants such substances should be used, which have not been used materially and sometimes discarded as waste products.

It has surprisingly been found that an aged bituminous road-breaking material by admixing 0.1 to 4 Ms. -% Chlorine paraffin with a chain length distribution of C ^ ₂ ^{to σ} ? 0 and a chlorine content between 30 to 42 wt .-% and 0.1 up to 6 Ma + -% puller with a grain size = 0.09 mm results in a bituminous mix, which can be advantageously used for the manufacture, maintenance, servicing and care of road surfaces.

According to the invention, the object is achieved by a combination of 90 to 99 »8 Ma. % aged bituminous roadbreaking materials, 0.1 to 4% by weight chlorinated paraffin having a chain length distribution of C ₁₂ to C ₂₀ and a chlorine content of between 30 to 42 Ma. -5 S and 0.1 to β Ma. # pullers of one grain size = 0.09 mm dissolved.

Bach to a further feature of the invention, the same effect is achieved if the mixture to β wt .- $ 5 of a Entasphaltierungsrückstandes from propane deasphalting of heavy petroleum products and or or about 300 ⁰ C boiling petroleum component is added.

EXAMPLES

1. In a double-shaft force mixer, 7 kg of a hitherto no longer usable high-molecular Chlorparäffins with a chain length of C ₁ ^ to C ₁ Q, a chlorine content of 35 wt .-% and the other characteristics

Density at 100 ⁰ C 1.018 g / cm ³

Viscosity at 100 ⁰ C 1.8 ⁰ E

Water content 0.5% by volume

Pour point -20 ⁰ C

Flashpoint 196 ⁰ C

Coking tendency 4 $ 1% by mass

Benzene insoluble 0.8 Ma. -%

750 kg of an aged bituminous road-breaking material with a binder content of 6.2 Ma. - Homogenised % and 11 kg of limestone powder at a temperature of 200 ⁰ C until completely enveloping the aged bituminous silica and limestone powder. The following characteristic values were obtained from the obtained hot mixed material compared to the used bituminous road-breaking material 3:

characteristic value g / cnr Old tes bit. regenerated % Aufbruchmat. On break. Density / 3 G VoI · -55 2,285 2,280 void content cli 9.0 4.2 water absorption mm · 10 4.7 1.7 Marshall stability kU / mm 5.4 9.89 Jließwert H / mm ² 25 44 rigidity mm 2.2 2.25 splitting tensile strength rnrn 1.05 1.73 Querzugsverformung 0.1 0.23 dynamic stamp impression 4.9 2.1

(at 60 C, after 60 min.)

The mix is suitable for the execution of bituminous construction layers up to load class 3 ·

A mixture of 16 kg of a more characterized in Example 1 higher molecular Chlorparäffins, 2 kg of propane bitumen, 2 kg of a resulting in the vacuum distillation of petroleum residues vacuum distillate with the characteristics

Initial boiling point 380 ⁰ C

Density at 70 ⁰ C 0.918 g / cm ³

Viscosity at 70 ⁰ C 170 cm ² / s

Flash point oT 294 ⁰ C , r

750 kg of an aged bituminous road-breaking material, which has a binder content of 4.1 Ma -% and 28 kg of limestone powder is homogenized at a temperature of 190 ⁰ C until the uniform distribution of all components in a twin-shaft force mixer. From the hot mix obtained, the following parameters were determined in relation to the aged bituminous road-breaking material used:

characteristic value g / ccr aged bit.Auf- regenerated departure %. - bruchmat ♦ mat. Density / 3 G Vol 53 2,073 2,327 void content ksr 20.5 4.2 water uptake mm.10 17.9 1.1 Marshall stability KEF / mm 5.4 7.7 flow value H / mm ² 36 46 rigidity mm. 1.5 1.67 splitting tensile strength mm 0.55 0.87 Querzugsverformung 0.08 0.22 dynamic stamp impression 4.5 1.2

(at 60 G, after 60 min.)

The regenerated breaking material obtained is suitable for the construction of bituminous construction layers up to stress class 2.

Claims (2)

Inventive u. η gsanspruch 1 · Bituminous mix for the production, repair, maintenance and servicing of road surfaces based on aged bituminous roadworks, characterized by 90 to 99 * 8 Ma. -% road-breaking material, 0.1 to 4.Ma "-% chlorinated paraffin with a chain length distribution of C ₁₂ to C ₂ O and a chlorine content of 30 to 42 Ma · JS and 0.1 to 6 Ma. -% Puller with a grain size = ί 0.09 mm. 2 »A bituminous paving mix according to item 1, characterized by an addition of up to 6 Ha" -% of a Entasphaltierungsrückstandes from propane deasphalting of heavy petroleum products and or · a or about 300 ⁰ C boiling petroleum component.