FI91879C - Asphalt pulp and the additive of asphalt pulp - Google Patents

Description

91879

Asphalt mix and asphalt mix additive

The invention relates to an asphalt mix which comprises, as the main components, a combination of a filler, a binder, such as bitumen, and at least one additive, the additive being at least in part a mantle oil pitch.

It is generally known to use, in particular as an asphalt compound for the asphalt paving of roads 10, consisting mainly of a mixture of bitumen as a binder and aggregate as a filler, as an additive. Each additive improves the overall properties of the asphalt mix. As an additive, 15 e.g. filler fibers, as disclosed, for example, in Finnish patent application 886058. However, the filler fiber-says does not fully solve the wide range of problems associated with the growing demands placed on existing asphalt-20 weaves. It is further known to use mono- and diamides, in particular to improve the adhesion between the filler fibers and the bitumen. However, amides are very expensive materials to use as an additive in asphalt.

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Otherwise, with regard to the state of the art, reference is made to a group of reference publications which cover e.g. US-2,728,682, US-4,437,896, US-4,362,568 and US-4,822,425. The publications describe asphalt masses in which mantle oil pitch has been used as an additive. It may be noted that in other respects, other, very essential features of the present invention are not disclosed in this reference.

Further with respect to the prior art, reference is made to GB-2131032, for which, however, the use of pine oil oils is not known. The asphalt mass disclosed in GB-2131032 comprises a fiber addition having a length η of fibers 91879 2. 10 nun. The fibrous material is Iasi, asbestos or a synthetic polymer. The publication uses a fatty acid / resin-based substance as an additive and not a pine oil pitch.

It has surprisingly been found in the present invention that when the tall oil pitch contains filler fibers, preferably cellulose-based filler fibers, that the mixture of mantle oil and filler fibers is in a viscous form of 10-3 mm and that the filler fibers have a maximum dimer size of 0.1-5 preferably 0.2-2.5 mm, the state of the art, in particular as regards the quality characteristics of the asphalt mix, can be considerably increased.

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Furthermore, the use of mantyol grains as an additive in asphalt mass at least in part allows a very advantageous way of placing the filling fiber among the asphalt mass.

When the filler fibers are placed in the set of pine oil stumps 20 in such a way that the mixture of pine oil sticks and filler fibers is formed with suitable viscous properties and in particular homogeneous, the mixture is suitable for pumping by liquid transfer techniques into the asphalt mix. In this case, an asphalt mass is obtained in which the filler fibers and the pine oil pitch are homogeneously applied to the asphalt mass.

The use of pine oil oils, at least in part as an additive-30, in itself offers a considerable number of advantages, in particular the use increases the reusability of the • asphalt mix and the service life of the asphalt coating. These advantages can be identified as follows: 35 - the use of pine oil oils increases the cohesive forces between the components of the asphalt mix, In application, the use of pine oils effectively increases the adhesion of bitumen to the aggregate, especially the pores of the aggregate, and the use of pine oils increases the resistance of the asphalt mass to the harmful effects of ultraviolet light.

In addition to the above, it can be stated that the filler-15 firebox, which is carried out on the mantle oil pitch, has the following additional advantages: the use of the additive can be increased, as a result of which

In particular, if the filler fiber is suitably selected, for example, from a cellulose-based material, an environmentally friendly additive composition is obtained. In this connection, it can be stated that in the present invention the term "tall oil pitch" refers to the distillation of mantle oils formed as a by-product of the sulphate process. renewable resource and the organic matter is 35 environmentally friendly.

91879 4

The invention also relates to an additive according to the independent claim for an additive for use as a component for the production of asphalt mix.

The additive according to the invention is mainly characterized in that the mantle oil pitch contains filler fibers, preferably cellulose-based filler fibers, that the mixture of mantle oil and filler fibers is in a viscous, liquid-to-liquid form, and 0.1-3 mm and preferably 0.2-2.5 mm.

The invention and one of its applications are explained in more detail in the accompanying drawing, in which Figure 1 schematically shows the preparation of a mantle oil pitch-based additive containing filler fibers and Figure 2 shows the so-called a schematic side view of the mobile asphalt station, wherein the mobile asphalt station handles the equipment for producing the asphalt mass by the recyclable-25 method.

According to Figure 1, in the preparation of the additive according to the invention, manty oil pitch 2 and filling fibers 3 are added to the mixing tank 1 via a feed hopper S.

The mixing tank 1 has a mixing member 4, e.g. a rotating (arrow N) mixer, such as a screw mixer, which mixes the mantle oil and the filling fibers into a homogeneous additive. From the mixing tank 1, the additive is transferred, preferably by means of a transfer screw 4a, e.g.

5,91879

The mobile asphalt station shown in Fig. 2 connects the heating equipment in connection with one or more parts 7 of the frame provided with a wheel 6 to the asphalt surface to be recycled 5, the means for removing the asphalt coating preferably by roughening at least partially from the ground depth. In some cases of use, the detachment takes place from a depth which at least causes the wear of the wear walls 10 or the like caused by traffic. In addition, the apparatus includes means 10 for intermediate storage and feeding of the aggregate asphalt mass in connection with the detached asphalt coating, whereby the recycling process operates continuously in situ. Preferably in several applications 15 the aggregate asphalt mass is mixed with the detached asphalt coating and an additive is placed in the aggregate asphalt mass either so that the aggregate asphalt mass contains the additive already before the actual mixing step 11 (dashed line L The steps and measures presented above are not explained in more detail in this context, as they are within the normal competence of a professional in the field.

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According to the invention, a storage tank or the like 8 is placed in connection with the mobile asphalt station, in which an additive m is pumped to a mixing step 11, to which the removed asphalt coating (arrow A in Fig. 2) is preferably introduced and the filling asphalt mass is passed from the connection of the asphalt station in question. from stock 10 (arrow B). As previously mentioned 6 91S79, the additive is fed by a pump 9 and transfer piping from the selective storage 8 to the mixing stage 11 (arrow C) and / or to the aggregate asphalt mass. The mixed components (arrow A-C) are passed to the means for applying the asphalt spin-5 weft back as a re-asphalt coating to the rear of the mobile asphalt station (direction of movement arrow LS) in a manner known to the art. In connection with the casting storage 8, it is advantageous to arrange a heating unit E with which the viscosity properties of the mantle oils and thus the pumpability can be maintained in a suitable temperature range.

The application rates of mantle oils containing filler fibers can vary considerably depending on whether it is the production of a new asphalt coating or the production of a new asphalt coating. As application values, which, of course, require confirmation of the experience and test results obtained by a person skilled in the art in each specific situation, the following can be given: 20. 3-2.5% and preferably 0.5-1.5% of the total weight of the new asphalt coating; up to 35%, preferably 10-30%, and preferably 15-25% of the total amount of the additive may be used in addition to the filler fiber by volume, and 30 that the amount of use in a volume percentage of at most 35% is at most 3%, preferably 0.1-2.0% and preferably 0.2-1.0% of the total amount of asphalt coating removed.

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In the case of filler fibers in particular, it can be mentioned that cellulose-based materials are preferred.

Particularly preferred in the paper and / or board manufacturing process is a wreck generated by a paper machine, e.g. an edge tape, from which shredded paper can be made for use as a filler fiber. The filling fibers can have a size (in terms of their largest dimension, i.e. approximately their length) of 0.1-5 mm, preferably 0.1-3 mm and preferably 0.2-2.5 mm.

It is clear that, in addition to mantle oils, other additives can also be used, at least in erSissS special applications. Of course, the filler fibers 15 may also be of a material other than a cellulose-based material.

Claims (5)

91879 Claims; An asphalt mix comprising as a main component a combination of a filler, a binder such as bitumen and at least one additive, the additive being at least in part a pine oil pitch, characterized in that and that the filling fibers have a maximum dimension of 0.1-5 mm, preferably 0.1-3 mm and preferably 0.2-2.5 mm. Asphalt mix according to Claim 1, characterized in that the asphalt mix contains a maximum of 3% by volume, preferably 0.3-2.5% and preferably 0.5-1.5%, of mantoly oil-based additive, when used as an additive in the new asphalt mix. 20 Asphalt mix according to Claim 1, characterized in that the asphalt mix contains up to 3% by volume, preferably 0.1-2.0% and preferably 0.2-2.0%, of mantoly oil-based additive when used as an additive in the detached asphalt mix. 4. Lisåaine kåytettåvåksi asphalt mass manufacture of which lisåaine is måntyoljypikeå, wherein 30 be interline, and working måntyoljypiki sisåltåå tåytekuituja, preferably a cellulose-based tåytekuituja, and working formed måntyoljypien and tåytekuitujen mixture is a viscous, liquid transfer techniques displaceable tåvåsså form, and working tåytekuidut have a maximum of 35 of dimension 0 , 1-5 mm, preferably 0.1-3 mm and preferably 0.2-2.5 mm. li 91879 Additive according to Claim 4, characterized in that it contains an addition of filler fibers which is at most 35% by volume, preferably 10-30% and preferably 15-25% of the total weight of the mantle oil pitch-based additive. 91879