FI91880C - Method for producing asphalt mix - Google Patents

Description

91880

Method for producing asphalt mass Separated from application 920051 5

The invention relates to a method in which the asphalt mix is produced by a remixer or re-cycling in situ method. In such a case, the following 10 operations are carried out using the apparatus applied in such a case: after the possible pre-treatment steps, the asphalt coating to be recycled is preferably removed by roughing at least partially to a depth,

Additives are commonly used, especially in asphalt mixes for road asphalt pavements, which mainly consist of a mixture of bitumen as binder and aggregate as aggregate. Each additive improves the overall properties of the asphalt mix. As an additive, e.g. filler fibers, as disclosed, for example, in Finnish patent application 886058. However, the addition of filler fiber-30 does not fully solve the wide range of problems associated with the growing demands placed on current asphalt coatings. 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 mix.

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By reprocessing method is meant a method in which at least a portion of the renewable coating is removed and used as part of the recycled asphalt coating to be formed. By aggregate asphalt mass is meant sitS "maiden-5 cellular mass" which is added to the recycled asphalt coating. The reprocessing method has applications in which the detached coating is applied as a separate lower coating sublayer and the filling mass on top of the above sublayer as the outermost sublayer.

It has surprisingly been found in the present invention that when the additive is a mantle oil pitch in viscous form which can be treated by liquid transfer techniques, the state of the art in the art, in particular as regards the quality properties of the asphalt mass, can be considerably increased. In order to achieve this object, the process according to the invention is mainly characterized in that, in connection with the preparation of a recycled asphalt mass 20 to be applied as a secondary asphalt coating, consisting of a filling asphalt mass and a detached asphalt pavement. Thus, a mantle oil pitch containing mantle oil and / or filler fibers is preferably added and mixed into the asphalt masses forming both sublayers. On the other hand, an application is also known from the recycling process, in which the aggregate asphalt mass and the detached coating are at least partially mixed together and the combination forms a recycled asphalt coating consisting of a single layer. The mantle oil pitch and / or the mantle oil pitch containing the filler fibers is then added to the asphalt masses - the aggregate asphalt mass and the removed asphalt coating - in the mixing step either as a separate component or as a component added to one or both asphalt masses before the mixing step.

ii 3 91880 The use of tall oil pitches as a viscous additive adds a considerable number of advantages, in particular the use increases the reusability of the asphalt mix and the service life of the asphalt coating. Of these advantages, the following can be distinguished: the use of mantle oils increases the cohesive forces between the components of the asphalt mix, - the tall oil pitch is so that the desired uniform asphalt masses are obtained, in which case the asphalt mass is e.g. easier to apply, the use of mantle oils effectively increases the adhesion of bitumen to the aggregate, especially the pores of the aggregate, the use of mantle oils increases the durability of the asphalt mass against the harmful effects of ultraviolet light, and the applied, oxidized and oxidized

Furthermore, the use of pine oil pitches as an additive for asphalt pulp at least in part allows a very advantageous way of placing the filler fiber among the asphalt pulp. When the filler fibers are placed among the pine oil so that the mixture of pine oil and the filler fibers is formed with suitable viscous properties and particularly homogeneous, the mixture is suitable for pumping by liquid transfer techniques in the asphalt mix to other components of the asphalt mix. 91880 4 is then obtained in an asphalt mass in which the filler fibers and the mantle oil pitch are homogeneously applied to the asphalt mass.

The addition of filler fiber to the xanthole oil pitch provides the following additional advantages: the use of the additive can be increased, as a result of which the cohesive forces between the components of the asphalt mass are further increased, the workability of the asphalt mass is improved and

In particular, if the filler fiber is suitably selected from e.g. 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 "mantle oil pitch" refers to the distillation of mantle oils formed as a by-product of the sulfate process. MSn oil contains fatty, resin acids, esters of the above topics and a neutral substance as main components. Mantyol oil is derived from wood, is based on a renewable resource and has 25 environmentally friendly organic matter.

According to a preferred embodiment, the mantle oil pitch containing the filler fibers is preferably stored by a reprocessing method in connection with the in situ asphalt pulp production plant, and the oil pitch pitch is preferably fed and mixed into the filler asphalt mass and at least the detached asphalt coating. The pine oil pitch can also be fed to the mixable asphalt mass and the detached asphalt-35 coating as a separate component and / or preferably among the aggregate and / or at least the detached asphalt coating. A mantle oil pitch or a mantle oil pitch containing filler fibers is rheological

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5 91880 (viscous) properties are arranged so that it can be transferred by means of fluid transfer techniques using means for transferring fluids, such as special pumps. It is clear that in most of the situations of use 5 the viscosity of the additive is relatively high due to the known rheological properties of pine oils, so the transfer of

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 fiber-based pitch additive containing filler fibers, and Figure 2 shows the so-called a schematic side view of a mobile asphalt station, the mobile asphalt station comprising an apparatus for producing an asphalt mass by a recyclable-25 method.

According to Fig. 1, in the preparation of the additive according to the invention, pine oil pulp 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 mantyol grains and the filling fibers into a homogeneous additive. From the mixing tank 1, the additive is transferred, preferably by a transfer member 4a, e.g. with a transfer screw to the intermediate storage-V.

The mobile asphalt station shown in Figure 2 comprises, in connection with a one- or more-part body 7 6 91 880 provided with a hydride 6, heating installations for heating the asphalt surface to be reprocessed, means for removing the asphalt surface preferably by roughing at least part of the ground depth. In some cases of use 5, the detachment takes place at a depth which at least causes the leveling of wear walls or the like caused by traffic. In addition, the apparatus includes means 10 for intermediate storage and injection of the asphalt mix into the removed asphalt coating together, whereby the reprocessing method operates continuously in situ. Preferably, in many applications, the aggregate asphalt mix is mixed with the detached asphalt coating and an additive is placed in the aggregate asphalt mass either so that the aggregate 15 contains the additive already before the actual mixing step 11 The steps and measures presented above will not be explained in more detail in connection with this 20, as they are within the normal competence of a person skilled in the art.

According to the invention, a storage tank or the like 8 is placed in connection with a mobile asphalt station. during which it is pumped to the mixing step 11, to which the removed asphalt coating (arrow A in Fig. 2) is preferably fed and the filling asphalt mass is fed from the connection of the asphalt station in question. from intermediate storage 10 (arrow B). As previously mentioned, the additive is fed by a pump 9 and transfer piping from the intermediate storage 8 to the mixing stage 11 (arrow C) and / or to the aggregate asphalt mass. The mixed components (arrow A-C) are fed to the bodies on the asphalt surface.

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9188 (} 7 for spreading the weft back as a re-asphalt coating to the rear of the mobile asphalt station (direction arrow LS) in a manner known to a person skilled in the art.

The application rates of mantle oil sticks or pine oil sticks 10 containing filler fibers can vary considerably depending on whether it is the production of a new asphalt coating or the production of a recycled asphalt coating. The use values which, of course, require confirmation in each specific situation from the experience of a container operator and the test results, can be given: -2.5% and preferably 0.5-1.5% of the total amount of new asphalt coating; up to 35% by volume, preferably from 10 to 30%, and preferably from 25 to 25%, of the total amount of additive, and such that the volume percentage used is at most 3%, preferably 0.1-2.0% and preferably; 0.2-1.0% of the total amount of asphalt pavement removed.

35 With regard to filler fibers in particular, it can be mentioned that cellulose-based materials are preferred.

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Particularly preferred is a paper machine-generated wreck in the papermaking and / or board manufacturing process, e.g. an edge band from which shredded paper can be made to be used as a filler fiber. The filler fibers can have a size of 0.1 to 5, preferably 0.1 to 3 mm and preferably 0.2 to 2.5 mm.

It will be appreciated that in addition to mantle oils, other additives may be used as additive 10 in at least some specific applications. Of course, the filler fibers can also be a material other than a cellulose-based material.

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Claims (6)

91880 1. A method for producing asphalt mass. by in situ reprocessing. wherein the apparatus applying method 5 performs the following operations: after the possible pre-treatment steps, removing the asphalt coating to be recycled at least partially from the ground depth, performing additive additions and possible bituminous additions, that in the course of the manufacture of the recycled asphalt mass, which consists of a filling asphalt-20 mass and a detached asphalt coating, a mantle oil pitch containing filler fibers in the form of a viscous liquid is added as an additive. A method for producing asphalt mass according to claim 1, in particular a so-called by the reprocessing method in situ. characterized in that - the mantle oil pitch is stored in connection with the equipment which produces the asphalt mass by the recycling process, the mantle oil pitch is fed and mixed at least to the detached asphalt coating and preferably also to the filling asphalt mass. and mixing the mantle oil pitch as a separate component with the mixed asphalt mass and the detached asphalt coating 91880 as a separate component and / or with the detached asphalt coating and preferably also with the aggregate asphalt coating. 5 Process according to Claim 1 or 2, characterized in that filler fibers, preferably cellulose-based filler fibers, containing mantyol pitch, are used as additive, the filler fibers being selected from the largest dimensions of 0.1 to 5 mm. preferably 0.1-3 mm and preferably 0.2-2.5 mm. Process according to one of Claims 1 to 3, characterized in that a maximum of 3%, preferably 0.3-2.5% and preferably 0.5-1.5% by volume, based on the additive, of mantle oil pitch-based additive is added when it is used as an additive in asphalt. mass. Process according to one of Claims 1 to 3, characterized in that a mantle oil pitch-based additive is added in an amount of up to 3% by volume, preferably 0.1 to 2.0% and preferably 0.2 to 1.0%, when used as an additive in the asphalt mix. 25 Process according to Claim 3, characterized in that the filler fibers are added in a volume percentage of mantle oil pitch of at most 35%, preferably 10-30% and preferably 15-25% of the total amount of mantle oil pitch-based additive 30. Π 91880