JP7460342B2 - Manufacturing method and device for manufacturing recycled asphalt mixture - Google Patents

Manufacturing method and device for manufacturing recycled asphalt mixture Download PDF

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JP7460342B2
JP7460342B2 JP2019172000A JP2019172000A JP7460342B2 JP 7460342 B2 JP7460342 B2 JP 7460342B2 JP 2019172000 A JP2019172000 A JP 2019172000A JP 2019172000 A JP2019172000 A JP 2019172000A JP 7460342 B2 JP7460342 B2 JP 7460342B2
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aggregate
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recycled aggregate
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義伸 志賀
俊史 末原
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本発明は、アスファルト再生骨材を利用した再生アスファルト混合物の製造方法及び再生アスファルト混合物製造装置に関する。 The present invention relates to a method for producing a recycled asphalt mixture using recycled asphalt aggregate, and an apparatus for producing a recycled asphalt mixture.

近年、アスファルト舗装の表層と基層に施工されたアスファルト混合物の廃材を破砕することでアスファルト再生骨材が製造されている。このアスファルト再生骨材は再生アスファルト混合物の材料として用いられ、新規のアスファルト及び新規の骨材とを混ぜ合わせて再生アスファルト混合物としてアスファルト舗装道路に広く施工されている。
例えば、従来の再生アスファルト混合物の製造方法では、図４に示すように、アスファルト再生骨材(以下、単に再生骨材という)１００をドライヤ１０１で加熱する。そして、加熱した再生骨材１００を、加熱した新規の細骨材１０２及び粗骨材１０３、新規のアスファルト１０４と共にミキサー１０５に投入して攪拌混合することで再生アスファルト混合物を製造し、再生アスファルト舗装として路面に敷設している。 In recent years, recycled asphalt aggregate has been produced by crushing waste asphalt mixtures applied to the surface and base layers of asphalt pavement. This recycled asphalt aggregate is used as a material for recycled asphalt mixtures, and is widely used on asphalt pavement roads by mixing it with new asphalt and new aggregate to produce recycled asphalt mixtures.
For example, in a conventional method for producing recycled asphalt mixture, as shown in Fig. 4, asphalt recycled aggregate (hereinafter simply referred to as recycled aggregate) 100 is heated in a dryer 101. The heated recycled aggregate 100 is then charged into a mixer 105 together with heated new fine aggregate 102, coarse aggregate 103, and new asphalt 104, and stirred and mixed to produce a recycled asphalt mixture, which is then laid on the road surface as recycled asphalt pavement.

再生骨材１００は廃材となった旧骨材の表面に旧アスファルトが被覆されている。アスファルト舗装の再生骨材１００を繰り返して再生することによりアスファルトが製造時の再加熱や供用中の紫外線で劣化し油分が脱落するため、再生骨材１００等を混合した再生アスファルト混合物は次第に性能が劣化してしまう。すると、再生アスファルト舗装に短期間で轍掘れやひび割れ等が発生するという問題が生じる。
この問題を解決するため、例えば特許文献１に記載された再生骨材では、油分が付着した表面を削り取ることによって付着した油分量を少なくし、その後の加熱工程において、再生骨材に再生用添加剤を添加して新規のアスファルトと混合することで、再生アスファルト混合物の性能を高めるとしている。 The surface of the recycled aggregate 100 is old aggregate that has become waste material and is covered with old asphalt. By repeatedly regenerating recycled aggregate 100 for asphalt pavement, the asphalt deteriorates due to reheating during manufacturing and ultraviolet rays during use, and the oil content falls off, so the performance of recycled asphalt mixtures mixed with recycled aggregate 100 etc. gradually improves. It will deteriorate. This causes a problem in that the recycled asphalt pavement develops ruts, cracks, etc. in a short period of time.
In order to solve this problem, for example, in the recycled aggregate described in Patent Document 1, the amount of oil attached is reduced by scraping off the surface to which oil has adhered, and in the subsequent heating process, the recycled aggregate is added for recycling. By adding additives and mixing them with new asphalt, the performance of reclaimed asphalt mixtures is improved.

特開２００９－１０２８８３号公報JP 2009-102883 A

しかしながら、特許文献１に記載された再生アスファルト混合物は、その性能が十分回復しているとはいえない。そのため、この場合でも比較的短期間で再生アスファルト舗装に骨材飛散やひび割れ等が発生するという問題が生じる。 However, the recycled asphalt mixture described in Patent Document 1 cannot be said to have sufficiently recovered its performance. Therefore, even in this case, the problem arises that aggregate scattering, cracking, etc. occur in the recycled asphalt pavement in a relatively short period of time.

本発明は、このような実情に鑑みてなされたものであり、より優れた耐久性を発揮できる再生アスファルト混合物の製造方法及び再生アスファルト混合物製造装置を提供することを目的とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for producing a recycled asphalt mixture and an apparatus for producing a recycled asphalt mixture that can exhibit better durability.

本発明に係る再生アスファルト混合物の製造方法は、加熱溶融した新規のアスファルトと再生用添加剤及び／または施工性改善剤と第一の再生骨材とを、混合してアスファルトモルタルを製造する工程を、有することを特徴とする。
本発明によれば、加熱溶融した新規のアスファルトと再生用添加剤及び／または施工性改善剤と第一の再生骨材の３種の材料を混合してアスファルトモルタルを製造することで第一の再生骨材に付着する旧アスファルトの柔軟性と耐久性を回復させたアスファルトモルタルを製造することができる。 The method for producing a recycled asphalt mixture according to the present invention includes a step of mixing heated and melted new asphalt, a recycling additive and/or a workability improving agent, and a first recycled aggregate to produce an asphalt mortar. , is characterized by having.
According to the present invention, an asphalt mortar is produced by mixing three types of materials: a new heated and melted asphalt, a recycling additive and/or a workability improving agent, and a first recycled aggregate. It is possible to produce asphalt mortar that restores the flexibility and durability of old asphalt that adheres to recycled aggregate.

また、上述の製造方法で製造されたアスファルトモルタルと第一の再生骨材より粒径の大きい第二の再生骨材及び／または新規骨材とを混合して再生アスファルト混合物を製造する工程を、更に有することが好ましい。
本発明によれば、第一の再生骨材の表面に再生用添加剤及び／または施工性改善剤を付着させて浸透させ、アスファルトを加熱混合することでより均一に混合できて、第一の再生骨材に付着する旧アスファルトの柔軟性と耐久性を回復できるため、アスファルト舗装の轍掘れやひび割れの起こりにくい耐久性の高い混合物を得られる。 Further, a step of manufacturing a recycled asphalt mixture by mixing the asphalt mortar manufactured by the above-mentioned manufacturing method with a second recycled aggregate and/or a new aggregate having a larger particle size than the first recycled aggregate, It is preferable to further include.
According to the present invention, a recycling additive and/or a workability improving agent is attached to the surface of the first recycled aggregate and permeated therein, and by heating and mixing asphalt, it is possible to mix the asphalt more uniformly. The flexibility and durability of the old asphalt attached to the recycled aggregate can be restored, resulting in a highly durable mixture that is less susceptible to rutting and cracking in asphalt pavement.

また、第一の再生骨材は、粒径が５ｍｍ以下であることが好ましい。
粒径５ｍｍ以下の第一の再生骨材を用いることで粒度が安定し、再生用添加剤及び／または施工性改善剤とアスファルトを加熱混合することで効率よく混合できて、品質の安定したアスファルトモルタルを製造できる。 Moreover, it is preferable that the first recycled aggregate has a particle size of 5 mm or less.
By using the first recycled aggregate with a particle size of 5 mm or less, the particle size is stabilized, and by heating and mixing the recycling additive and/or workability improving agent with asphalt, the asphalt can be mixed efficiently and the quality is stable. Can make mortar.

また、第一の再生骨材には旧アスファルトが３％以上含まれていてもよい。
第一の再生骨材の表面に旧アスファルトが３％以上含まれているため、再生用添加剤及び／または施工性改善剤が均等に浸透して均一に混ざり合って油分が多くなり柔軟性と耐久性を回復でき、品質が向上する。 Further, the first recycled aggregate may contain 3% or more of old asphalt.
Since the surface of the first recycled aggregate contains 3% or more old asphalt, the recycling additive and/or workability improving agent penetrates evenly and mixes uniformly, increasing the oil content and improving flexibility. Durability can be restored and quality improved.

また、アスファルトモルタル製造時に、新規のアスファルトと加熱混合を行う前の第一の再生骨材は常温である。
第一の再生骨材は常温であるため、加熱せずに保管することができる。 In addition, when producing asphalt mortar, the first recycled aggregate is at room temperature before being heated and mixed with new asphalt.
The first recycled aggregate is at room temperature and can be stored without heating.

また、アスファルトモルタルに、加熱された粒径５ｍｍ超の第二の再生骨材及び／または加熱された新規骨材を混合することで、再生アスファルト混合物を製造する工程を、有していることが好ましい。
アスファルトモルタルに加熱された第二の再生骨材及び／または新規骨材を混合することで、再生アスファルト混合物を製造できる。 Further, the method may include a step of manufacturing a recycled asphalt mixture by mixing heated second recycled aggregate having a particle size of more than 5 mm and / or heated new aggregate with the asphalt mortar. preferable.
A recycled asphalt mixture can be produced by mixing the heated second recycled aggregate and/or new aggregate with the asphalt mortar.

また、新規のアスファルト及び／またはアスファルトモルタルに、発泡剤を含む水溶液を添加して発泡させることでアスファルトの容積を増大させ、粘性を低減させてもよい。
再生用アスファルト及び／またはアスファルトモルタル中で発泡剤が発泡することで泡がベアリングの役割を果たして混合性が向上する。 Moreover, the volume of asphalt may be increased and the viscosity may be reduced by adding an aqueous solution containing a foaming agent to the new asphalt and/or asphalt mortar to cause foaming.
When the foaming agent foams in recycled asphalt and/or asphalt mortar, the foam acts as a bearing and improves mixability.

また、アスファルトモルタルの製造時の加熱混合時間は１０分以上であることが好ましい。
アスファルトモルタルの製造時に１０分以上加熱混合することで、新規のアスファルトと第一の再生骨材と再生用添加剤及び／または施工性改善剤とをより均一に且つ十分混合できて品質が安定する。 The heating and mixing time during the production of the asphalt mortar is preferably 10 minutes or longer.
By heating and mixing for 10 minutes or more during the production of asphalt mortar, the new asphalt, the first recycled aggregate, and the recycling additive and/or the workability improving agent can be mixed more uniformly and thoroughly, resulting in stable quality.

本発明による再生アスファルト混合物の製造装置は、加熱された新規のアスファルトと第一の再生骨材と再生用添加剤及び／または施工性改善剤とを加熱混合してアスファルトモルタルを製造する混合釜と、アスファルトモルタルと第一の再生骨材より粒径の大きい第二の再生骨材及び／または新規骨材とを、攪拌混合することで再生アスファルト混合物を製造するミキサーと、を備えたことを特徴とする。
本発明によれば、混合釜で予め第一の再生骨材を含むアスファルトモルタルを製造することでアスファルトモルタルの性状が均一化されて第一の再生骨材の柔軟性と耐久性を回復でき、更にミキサーによって第二の再生骨材及び／または新規骨材を攪拌混合することで柔軟性と耐久性の高いアスファルト混合物を製造できる。 The apparatus for producing recycled asphalt mixtures according to the present invention is characterized by comprising a mixing kettle for producing asphalt mortar by heating and mixing heated new asphalt, a first recycled aggregate, and a recycling additive and/or a workability improving agent, and a mixer for producing a recycled asphalt mixture by stirring and mixing the asphalt mortar with a second recycled aggregate and/or new aggregate having a larger particle size than the first recycled aggregate.
According to the present invention, by producing asphalt mortar containing the first recycled aggregate in advance in a mixing kettle, the properties of the asphalt mortar can be made uniform and the flexibility and durability of the first recycled aggregate can be restored, and by further stirring and mixing the second recycled aggregate and/or new aggregate in a mixer, an asphalt mixture with high flexibility and durability can be produced.

本発明に係る再生アスファルト混合物の製造方法及び製造装置によれば、加熱溶融したアスファルトと再生用添加剤及び／または施工性改善剤とを混合すると共に第一の再生骨材と加熱混合してアスファルトモルタルを製造するため、再生用添加剤及び／または施工性改善剤によって第一の再生骨材の柔軟性と耐久性を回復でき、第一の再生骨材を含むアスファルトモルタルの性状が均一化されて高強度である。そのため、アスファルト舗装の骨材飛散やひび割れを長期間にわたって抑制して耐久性が向上する。 According to the manufacturing method and manufacturing device for recycled asphalt mixture of the present invention, heated and melted asphalt is mixed with a recycling additive and/or a workability improving agent, and is heated and mixed with the first recycled aggregate to produce asphalt mortar. Therefore, the flexibility and durability of the first recycled aggregate can be restored by the recycling additive and/or the workability improving agent, and the properties of the asphalt mortar containing the first recycled aggregate are uniformed and have high strength. As a result, aggregate scattering and cracking of the asphalt pavement are suppressed for a long period of time, improving durability.

本発明の実施形態による再生アスファルト混合物の製造装置と製造方法を示す模式図である。1 is a schematic diagram showing an apparatus and method for producing a recycled asphalt mixture according to an embodiment of the present invention. 第一の再生骨材に再生用添加剤を添加した図を示すものであり、（ａ）はアスファルト再生骨材の図、（ｂ）はアスファルト再生骨材に再生用添加剤を添加した従来例の図、（ｃ）はアスファルト再生骨材に再生用添加剤を添加した実施形態の図である。This figure shows a diagram in which a recycling additive is added to the first recycled aggregate, where (a) is a diagram of asphalt recycled aggregate, and (b) is a conventional example in which a recycling additive is added to asphalt recycled aggregate. FIG. 2C is a diagram of an embodiment in which a recycling additive is added to asphalt recycled aggregate. 従来方法と実施形態の方法で製造した再生アスファルト混合物の試験結果を示す表１である。Table 1 shows the test results of the recycled asphalt mixtures produced by the conventional method and the method of the embodiment. 従来例による再生アスファルト混合物の製造装置と製造方法を示す模式図である。FIG. 2 is a schematic diagram showing an apparatus and method for producing a recycled asphalt mixture according to a conventional example.

以下、添付図面を参照して、本発明の実施形態による再生アスファルト混合物の製造装置１と製造方法について説明する。
先ず、再生アスファルト混合物Ａを製造するために添加する再生骨材として、既設のアスファルト舗装の補修時や打ち換え時等に掘り起こしたアスファルト廃材を適当な大きさに破砕してアスファルト再生骨材を製造する。破砕されたアスファルト再生骨材は適宜範囲の粒径、例えば粒径１３ｍｍ～０ｍｍの範囲を有するとされている。そして、このアスファルト再生骨材は例えば６．３ｍｍの網目の篩によって粒径５ｍｍ以下、即ち粒径５ｍｍ～０ｍｍの第一の再生骨材(細骨材)ａと、粒径１３ｍｍ～５ｍｍ超の第二の再生骨材（粗骨材）ｂとに分級するものとする。これら第一の再生骨材ａ及び第二の再生骨材ｂには旧アスファルト量が３質量％以上含まれている。 Hereinafter, a manufacturing apparatus 1 for producing a recycled asphalt mixture and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.
First, asphalt waste excavated during repair or replacement of existing asphalt pavement is crushed to an appropriate size to produce asphalt recycled aggregate as a recycled aggregate to be added to produce recycled asphalt mixture A. The crushed recycled asphalt aggregate is said to have an appropriate range of particle size, for example, a particle size range of 13 mm to 0 mm. Then, this recycled asphalt aggregate is classified, for example, using a 6.3 mm mesh sieve into a first recycled aggregate (fine aggregate) a having a particle size of 5 mm or less, i.e., a particle size of 5 mm to 0 mm, and a second recycled aggregate (coarse aggregate) b having a particle size of 13 mm to over 5 mm. The first recycled aggregate a and the second recycled aggregate b contain 3 mass% or more of old asphalt.

図１は本発明の実施形態による再生アスファルト混合物Ａの製造装置１を示すものである。再生アスファルト混合物Ａの製造装置１は、新規のアスファルトｃを収容して加熱可能なアスファルト貯蔵サイロ２と、アスファルトｃと再生用添加剤ｄと第一の再生骨材ａとを加熱混合するための混合釜３とを備えている。混合釜３は内部にアスファルトｃと再生用添加剤ｄと第一の再生骨材ａとを攪拌するための攪拌羽根４が内蔵されている。混合釜３内に投入する新規のアスファルトｃは全体量の５～２０％程度であることが好ましい。なお、再生用添加剤ｄに代えて、或いは再生用添加剤ｄと共に施工性改善剤を添加してもよい。 FIG. 1 shows an apparatus 1 for producing recycled asphalt mixture A according to an embodiment of the present invention. The apparatus 1 for producing recycled asphalt mixture A includes an asphalt storage silo 2 that can accommodate and heat new asphalt c, and a system for heating and mixing asphalt c, recycling additive d, and first recycled aggregate a. It is equipped with a mixing pot 3. The mixing pot 3 has a built-in stirring blade 4 for stirring the asphalt c, the recycling additive d, and the first recycled aggregate a. The amount of new asphalt c charged into the mixing pot 3 is preferably about 5 to 20% of the total amount. In addition, a workability improving agent may be added in place of the recycling additive d or together with the recycling additive d.

本実施形態による再生アスファルト混合物Ａの製造方法では、最初に加熱されたアスファルトｃと再生用添加剤ｄとを混合釜３内に投入して加熱しながら攪拌混合し、その後に第一の再生骨材ａを混合釜３内に投入して更に所定時間攪拌混合することで全体に均一なアスファルトモルタルｅを製造するものとする。或いは、混合釜３内に再生用添加剤ｄと第一の再生骨材ａとアスファルトｃを同時にまたは前後して投入して、攪拌羽根４で混合してもよい。
アスファルトモルタルｅを製造する工程における混合釜３内での混合時間は、１０分以上、例えば１０分から１時間程度とする。後述するミキサー８とは別に再生用添加剤ｄ及び／または施工性改善剤と第一の再生骨材ａとアスファルトｃを攪拌羽根４で従来よりも長時間混合することで、アスファルトと第一の再生骨材に再生用添加剤ｄ及び／または施工性改善剤を十分しみこませて均一に混ぜることができる。 In the manufacturing method of the recycled asphalt mixture A according to this embodiment, first, heated asphalt c and recycling additive d are charged into the mixing vessel 3 and stirred and mixed while being heated, and then the first recycled aggregate a is charged into the mixing vessel 3 and further stirred and mixed for a predetermined time to produce an asphalt mortar e that is uniform throughout. Alternatively, recycling additive d, the first recycled aggregate a, and asphalt c may be charged into the mixing vessel 3 simultaneously or one after the other and mixed with the stirring blade 4.
The mixing time in the mixing tank 3 in the process of producing the asphalt mortar e is 10 minutes or more, for example, about 10 minutes to 1 hour. By mixing the recycling additive d and/or the workability improving agent with the first recycled aggregate a and the asphalt c with the stirring blade 4 for a longer time than in the past, separately from the mixer 8 described later, the recycling additive d and/or the workability improving agent can be sufficiently soaked into the asphalt and the first recycled aggregate and mixed uniformly.

新規のアスファルトｃとして、例えばストレートアスファルトやブローンアスファルト、ゴムやポリマーなどを添加した改質アスファルト等の一般的に舗装に用いられるものを採用できる。
また、再生用添加剤ｄは、アスファルト廃材である旧アスファルトｃ１に柔軟性等の性状を回復させる効果のある添加剤であり、鉱油等の石油潤滑油系のものが挙げられ、例えばＲＤＥＸ（ＪＸＴＧエネルギー株式会社製）、ＲＪ－１（三徳アスリード株式会社製）、ＲＪ－Ｔ（竹中産業株式会社製）等がある。再生用添加剤ｄの成分は飽和分、芳香族分、レジン分を含んでいる。再生用添加剤ｄの添加量は第一の再生骨材ａの全質量に対して０．１質量％以上であることが好ましい。 As the new asphalt c, those commonly used for pavement, such as straight asphalt, blown asphalt, and modified asphalt containing rubber, polymer, etc., can be employed.
In addition, the recycling additive d is an additive that has the effect of restoring properties such as flexibility to old asphalt c1, which is asphalt waste material, and includes petroleum lubricant oils such as mineral oil, such as RDEX (JXTG (manufactured by Energy Co., Ltd.), RJ-1 (manufactured by Santoku Aslead Co., Ltd.), RJ-T (manufactured by Takenaka Sangyo Co., Ltd.), etc. The components of the regeneration additive d include saturated components, aromatic components, and resin components. The amount of the recycling additive d added is preferably 0.1% by mass or more based on the total mass of the first recycled aggregate a.

また、施工性改善剤は、再生アスファルト混合物Ａの施工性を改善させる添加剤であり、具体的には再生アスファルト混合物Ａの粘度を低下させることができる。そのため、スコップやレーキ等の舗装道具を用いた再生アスファルト混合物Ａの敷き均し作業が容易になる。施工性改善剤として動植物油系や石油系が挙げられ、例えば脂肪酸系化合物、グリコールエーテル系化合物等がある。施工性改善剤の添加量は第一の再生骨材ａの全質量に対して０．０２質量％以上であることが好ましい。
また、再生用添加剤ｄと施工性改善剤の両方を用いる場合には、その比率によって各添加量が設定される。 In addition, the workability improving agent is an additive that improves the workability of the recycled asphalt mixture A, and specifically, it can reduce the viscosity of the recycled asphalt mixture A. Therefore, it becomes easier to spread the recycled asphalt mixture A using paving tools such as shovels and rakes. Examples of the workability improving agent include animal and vegetable oil-based and petroleum-based agents, such as fatty acid-based compounds and glycol ether-based compounds. The amount of the workability improving agent added is preferably 0.02% by mass or more based on the total mass of the first recycled aggregate a.
When both the recycling additive d and the workability improving agent are used, the amounts of each additive are set according to the ratio between them.

また、再生アスファルト混合物Ａの製造装置１では、新規な粗骨材（砂利）ｆ及び細骨材(砂)ｇを加熱するための第一のドライヤ５を備えている。また、上述した第二の再生骨材ｂを加熱するための第二のドライヤ６を備えている。第二の再生骨材ｂは粒径１３ｍｍ～５ｍｍ超の範囲の粒径を有している。これら加熱された粗骨材ｆ及び細骨材ｇ、第二の再生骨材ｂ、そして混合釜３で攪拌混合されたアスファルトモルタルｅを投入して攪拌混合するためのミキサー８を備えている。
なお、粗骨材として第二の再生骨材ｂまたは新規の粗骨材ｆのどちらか一方だけ、または両方を投入することができる。また、細骨材として第一の再生骨材ａを用いているため、新規の細骨材ｇは使用しなくてもよい。そのため、新規の粗骨材ｆは粒径５ｍｍ超以上であることが好ましい。更に残りの新規のアスファルトｃをミキサー８に投入する。 Furthermore, the apparatus 1 for producing recycled asphalt mixture A includes a first dryer 5 for heating new coarse aggregate (gravel) f and fine aggregate (sand) g. Further, a second dryer 6 for heating the second recycled aggregate b mentioned above is provided. The second recycled aggregate b has a particle size ranging from 13 mm to more than 5 mm. A mixer 8 is provided for charging and mixing the heated coarse aggregate f and fine aggregate g, the second recycled aggregate b, and the asphalt mortar e stirred and mixed in the mixing pot 3.
In addition, as the coarse aggregate, either the second recycled aggregate b or the new coarse aggregate f, or both may be input. Moreover, since the first recycled aggregate a is used as the fine aggregate, there is no need to use the new fine aggregate g. Therefore, it is preferable that the new coarse aggregate f has a particle size of more than 5 mm. Furthermore, the remaining new asphalt c is charged into the mixer 8.

ミキサー８内の攪拌羽根９によって所定時間攪拌されることで得られた再生アスファルト混合物Ａは、例えばダンプトラック１１に投下されてアスファルト舗装の施工現場に搬送される。或いは、現場でミキサー８から直接、再生アスファルト混合物Ａを排出して施工してもよい。 The recycled asphalt mixture A obtained by mixing for a predetermined time with the mixing blades 9 in the mixer 8 is, for example, dropped into a dump truck 11 and transported to the asphalt pavement construction site. Alternatively, the recycled asphalt mixture A may be discharged directly from the mixer 8 at the construction site and used for construction.

ところで、第一の再生骨材ａ及び第二の再生骨材ｂからなるアスファルト再生骨材は、既設のアスファルト舗装の補修時や打ち換え時等に発生するアスファルト廃材を適切なサイズに破砕したものである。アスファルトｃは飽和分、芳香族分、レジン分、アスファルテン(炭素)の４成分を含んでおり、再生を繰り返して古くなると飽和分が少なくなり、アスファルテンが多くなる特性を有する。これを旧アスファルトｃ１とする。アスファルト再生骨材には、骨材と骨材に付着した旧アスファルトｃ１を含んでいる。
しかも、この旧アスファルトｃ１の針入度（１／１０ｍｍ）は２０以上であることが好ましい。針入度は回収されたアスファルトの硬さを示す指標であり、針入度試験によって測定される。また、旧アスファルトｃ１の圧裂係数（ＭＰａ）は１．７０以下であることが好ましい。圧裂係数はアスファルト再生骨材の粘弾性(粘り強さや軟らかさ)を表す指標であり、圧裂係数試験によって測定される。 By the way, the asphalt recycled aggregate consisting of the first recycled aggregate a and the second recycled aggregate b is obtained by crushing asphalt waste material generated during repair or replacement of existing asphalt pavement into appropriate sizes. It is. Asphalt C contains four components: saturated content, aromatic content, resin content, and asphaltene (carbon), and as it ages through repeated regeneration, the saturated content decreases and asphaltene increases. This is called old asphalt c1. The recycled asphalt aggregate contains aggregate and old asphalt c1 attached to the aggregate.
Moreover, it is preferable that the penetration degree (1/10 mm) of this old asphalt c1 is 20 or more. Penetration is an indicator of the hardness of recovered asphalt and is measured by a penetration test. Moreover, it is preferable that the crush coefficient (MPa) of the old asphalt c1 is 1.70 or less. Crush coefficient is an index expressing the viscoelasticity (toughness and softness) of asphalt recycled aggregate, and is measured by a crush coefficient test.

次に、本実施形態による再生アスファルト混合物Ａの製造装置１を用いた製造方法について、図１及び図２を参照して説明する。
まず、前工程として、既設のアスファルト舗装の補修時や打ち換え時等に掘り起こしたアスファルト廃材を適当な大きさに破砕してアスファルト再生骨材を製造する。破砕されたアスファルト再生骨材の粒子は例えば粒径１３ｍｍ～０ｍｍの範囲とする。このアスファルト再生骨材には旧アスファルトが３質量％以上、通常では５～６質量％程度含まれている。
アスファルト再生骨材は、例えば図２（ａ）に示す形状を有している。第一の再生骨材ａまたは第二の再生骨材ｂからなる塊状の骨材ｋの表面に旧アスファルトｃ１と細骨材(砂)ａ１が付着して適宜厚さに被覆されている。このアスファルト再生骨材を例えば６．３ｍｍの網目の篩によって、粒径０～５ｍｍ以下の第一の再生骨材ａと粒径１３ｍｍ～５ｍｍ超の第二の再生骨材ｂとに分級する。再生骨材を分級することで粒度が安定し、品質変動を抑制できる。 Next, a manufacturing method using the manufacturing apparatus 1 for manufacturing recycled asphalt mixture A according to this embodiment will be described with reference to FIGS. 1 and 2.
First, in the pre-process, waste asphalt excavated during repair or replacement of existing asphalt pavement is crushed to an appropriate size to produce recycled asphalt aggregate. The particles of the crushed recycled asphalt aggregate have a particle size in the range of 13 mm to 0 mm, for example. This recycled asphalt aggregate contains 3% by mass or more of old asphalt, usually about 5 to 6% by mass.
The asphalt recycled aggregate has a shape, for example, as shown in Fig. 2(a). The surface of a block of aggregate k consisting of the first recycled aggregate a or the second recycled aggregate b is covered with old asphalt c1 and fine aggregate (sand) a1 to an appropriate thickness. This asphalt recycled aggregate is classified, for example, by a 6.3 mm mesh sieve into the first recycled aggregate a having a particle size of 0 to 5 mm or less and the second recycled aggregate b having a particle size of 13 mm to over 5 mm. By classifying the recycled aggregate, the particle size is stabilized and quality fluctuations can be suppressed.

分級に際して、アスファルト再生骨材を整流器や破砕機等に通すことでより多くの第一の再生骨材ａを取り出すことができる。なお、アスファルト再生骨材を分級する際、必ずしも粒径５ｍｍで分級しなくてもよく、例えば粒径６ｍｍ等でもよい。しかしながら、アスファルト再生骨材の粒径を５ｍｍより大きくすると再生用添加剤ｄも増やす必要があり、５ｍｍ以下に設定したことで含有するアスファルトｃが多くなるので再生用添加剤ｄを効率よく吸着できる。 During classification, by passing the asphalt recycled aggregate through a rectifier, a crusher, etc., more of the first recycled aggregate a can be taken out. In addition, when classifying the asphalt recycled aggregate, it is not necessarily necessary to classify the asphalt recycled aggregate to have a particle size of 5 mm, for example, the particle size may be 6 mm. However, if the particle size of the asphalt recycled aggregate is made larger than 5 mm, it is necessary to increase the amount of recycling additive d, and by setting the particle size to 5 mm or less, the amount of asphalt c contained increases, so the recycling additive d can be adsorbed efficiently. .

そして、アスファルト貯蔵サイロ２に収容された新規のアスファルトｃの一部を加熱溶融したものを混合釜３内に投与すると共に、再生用添加剤ｄ及び／または施工性改善剤を混合釜３内に投入する。これら新規のアスファルトｃと再生用添加剤ｄ及び／または施工性改善剤を攪拌羽根４によって攪拌混合することで再生用添加剤ｄ及び／または施工性改善剤が均等に分散された再生用アスファルトを製造する。
そして、混合釜３内に粒径５ｍｍ以下の第一の再生骨材ａを投入した後、再生用アスファルトと第一の再生骨材ａとを攪拌羽根４によって例えば１０分以上攪拌しながら加熱混合する。１０分以上加熱混合することで再生用アスファルトと第一の再生骨材ａは均一に混合される。これにより、アスファルトモルタルｅを製造できる。アスファルトｃは硫化水素やアルデヒド等の臭気成分を含むが、混合釜３内で加熱することで臭気が外部に漏出されにくくなる。 Then, a portion of the new asphalt c stored in the asphalt storage silo 2 is heated and melted and poured into the mixing kettle 3, and the regenerated additive d and/or workability improver are charged into the mixing kettle 3. The new asphalt c and the regenerated additive d and/or workability improver are stirred and mixed by the stirring blades 4 to produce regenerated asphalt in which the regenerated additive d and/or workability improver are evenly dispersed.
Then, after the first recycled aggregate a with a particle size of 5 mm or less is charged into the mixing vessel 3, the recycled asphalt and the first recycled aggregate a are heated and mixed while being stirred, for example, for 10 minutes or more, by the stirring blade 4. By heating and mixing for 10 minutes or more, the recycled asphalt and the first recycled aggregate a are mixed uniformly. In this way, asphalt mortar e can be produced. Asphalt c contains odorous components such as hydrogen sulfide and aldehyde, but by heating it in the mixing vessel 3, it becomes difficult for the odor to leak to the outside.

再生用アスファルトに混合する第一の再生骨材ａを粒径５ｍｍ以下にすることで再生用アスファルトとの混ぜ合わせ効率が良くなり、短時間で均一に混合できる。第一の再生骨材ａは従来バーナー等で加熱した後、再生用アスファルトと加熱混合していたが、本実施形態では常温で混合する。なお、第一の再生骨材ａは常温であるため加熱せずに保管できる。
粒径５ｍｍ程度でアスファルト再生骨材を分級することで第一の再生骨材ａの分量が多くなり、効率的にアスファルトｃと混合して１バッチでより効率的にアスファルトモルタルを製造できる。しかも、第一の再生骨材ａは再生用添加剤ｄ及び／または施工性改善剤を吸着して混合効率が良く、熱劣化を受けにくく高品質でアスファルトモルタルの製造時間を短縮できる。 By making the particle size of the first recycled aggregate a to be mixed with the recycled asphalt 5 mm or less, the mixing efficiency with the recycled asphalt is improved and it can be mixed uniformly in a short time. Conventionally, the first recycled aggregate a is heated with a burner or the like and then mixed with the recycled asphalt, but in this embodiment, it is mixed at room temperature. Since the first recycled aggregate a is at room temperature, it can be stored without heating.
By classifying the asphalt recycled aggregate into particles of about 5 mm, the amount of the first recycled aggregate a is increased, and it can be efficiently mixed with the asphalt c to produce asphalt mortar more efficiently in one batch. Moreover, the first recycled aggregate a adsorbs the recycling additive d and/or the workability improving agent, so that it has good mixing efficiency, is less susceptible to thermal deterioration, and can shorten the production time of high-quality asphalt mortar.

ここで、図２（ａ）に示すように、第一の再生骨材ａは粒径５ｍｍ以下の骨材ｋ（細骨材または粗骨材）の表面に旧アスファルトｃ１と細骨材ａ１が層状に付着している。従来の製造方法では、図２（ｂ）に示すように、第一の再生骨材ａは骨材ｋの表面に付着し被覆された再生用添加剤ｄ及び／または施工性改善剤が旧アスファルトｃ１内部に浸透するのに時間がかかる。そして、骨材ｋと旧アスファルトｃ１及び細骨材ａ１が熱で固くなり、再生用添加剤ｄ及び／または施工性改善剤は表面に付着して被膜となり、旧アスファルトｃ１の内部には十分浸透しない。そのため、第一の再生骨材ａは表面が滑り易くて動的安定度が小さく、その性状は十分回復しない。 Here, as shown in FIG. 2(a), the first recycled aggregate a has layers of old asphalt c1 and fine aggregate a1 attached to the surface of aggregate k (fine aggregate or coarse aggregate) with a particle size of 5 mm or less. In the conventional manufacturing method, as shown in FIG. 2(b), it takes time for the recycling additive d and/or workability improving agent attached to and coated on the surface of the first recycled aggregate a to penetrate into the old asphalt c1. Then, the aggregate k, old asphalt c1, and fine aggregate a1 harden due to heat, and the recycling additive d and/or workability improving agent adhere to the surface to form a coating, and do not fully penetrate into the old asphalt c1. Therefore, the surface of the first recycled aggregate a is slippery and has low dynamic stability, and its properties are not fully restored.

これに対し、本実施形態では、図２（ｃ）に示すように、第一の再生骨材ａの表面に被覆された再生用添加剤ｄ及び／または施工性改善剤が旧アスファルトｃ１内部に浸透して油分が多くなり軟らかくなる。この場合、再生用添加剤ｄ及び／または施工性改善剤は第一の再生骨材ａの骨材ｋ内まで浸透する必要はないが、表面から旧アスファルトｃ１内部の深い所まで(好ましくは骨材ｋの表面まで)均一に混ざり合うため、再生アスファルト混合物Ａの品質が向上する。 In contrast, in this embodiment, as shown in FIG. 2(c), the recycling additive d and/or workability improving agent coated on the surface of the first recycled aggregate a penetrates into the old asphalt c1, increasing the oil content and softening it. In this case, the recycling additive d and/or workability improving agent do not need to penetrate into the aggregate k of the first recycled aggregate a, but they are mixed uniformly from the surface to deep inside the old asphalt c1 (preferably to the surface of the aggregate k), improving the quality of the recycled asphalt mixture A.

また、混合釜３内で、新規のアスファルト、再生用アスファルトまたはアスファルトモルタルに、発泡剤を含む水溶液を添加して発泡させてもよい。発泡剤を添加して攪拌混合することで発泡材が発砲して容積を増大させてベアリングの役割を果たしてアスファルトを膨張させ、粘性を低減させて混合性が良くなる。 Alternatively, an aqueous solution containing a foaming agent may be added to new asphalt, reclaimed asphalt, or asphalt mortar in the mixing pot 3 to cause foaming. By adding a foaming agent and stirring and mixing, the foam material expands, expands its volume, acts as a bearing, expands the asphalt, reduces viscosity, and improves mixability.

混合釜３内で製造されたアスファルトモルタルｅはミキサー８に投入される。
一方、新規骨材である粗骨材ｆは第一のドライヤ５で加熱される。また、粒径１３ｍｍ～５ｍｍ超の粗骨材からなる第二の再生骨材ｂは第二のドライヤ６で加熱される。そして、新規の粗骨材ｆと第二の再生骨材ｂの一方または両方をミキサー８に投入し、石粉もミキサー８内に投入する。なお、新規の細骨材ｇは殆どミキサー８内に投入しないが、わずかに投入してもよい。また、不足分の新規のアスファルトｃを加熱溶融してミキサー８内に投入する。
そして、これら新規の粗骨材ｆ及び／または第二の再生骨材ｂ等をアスファルトモルタルｅとミキサー8内の攪拌羽根９で攪拌混合して、再生アスファルト混合物Ａを製造する。ミキサー８内で再生アスファルト混合物Ａを製造する際、フィラーとして例えば石粉等、一般的にアスファルト舗装に用いられる材料を投入することができる。 The asphalt mortar e produced in the mixing kettle 3 is charged into the mixer 8.
On the other hand, the coarse aggregate f, which is new aggregate, is heated in the first dryer 5. Also, the second recycled aggregate b, which is made of coarse aggregate with a particle size of 13 mm to more than 5 mm, is heated in the second dryer 6. Then, one or both of the new coarse aggregate f and the second recycled aggregate b are charged into a mixer 8, and stone powder is also charged into the mixer 8. Note that almost no new fine aggregate g is charged into the mixer 8, but a small amount may be charged. Also, the shortage of new asphalt c is heated and melted and charged into the mixer 8.
Then, these new coarse aggregates f and/or the second recycled aggregates b, etc. are mixed with the asphalt mortar e by the mixing blades 9 in the mixer 8 to produce the recycled asphalt mixture A. When producing the recycled asphalt mixture A in the mixer 8, materials generally used in asphalt pavement, such as stone powder, can be added as a filler.

上述したように、本実施形態による再生アスファルト混合物Ａの製造装置１及び製造方法は、アスファルトｃに再生用添加剤ｄ及び／または施工性改善剤を均一に混合させた再生用アスファルトに、粒径５ｍｍ以下の第一の再生骨材ａを投入して１０分以上混合してアスファルトモルタルｅを製造する。
これにより、第一の再生骨材ａの表面に付着した旧アスファルトｃ１に再生用添加剤ｄ及び／または施工性改善剤が均等に浸透し、従来のものより第一の再生骨材ａの柔軟性と耐久性を回復できるため、アスファルト舗装の骨材飛散、轍掘れやひび割れの起こりにくい耐久性の高い混合物を得られる。 As described above, the manufacturing device 1 and manufacturing method for recycled asphalt mixture A according to this embodiment produces asphalt mortar e by adding first recycled aggregate a having a particle size of 5 mm or less to recycled asphalt obtained by uniformly mixing asphalt c with recycling additive d and/or workability improvement agent, and mixing for 10 minutes or more.
This allows the recycling additive d and/or workability improvement agent to evenly penetrate the old asphalt c1 attached to the surface of the first recycled aggregate a, restoring the flexibility and durability of the first recycled aggregate a to a level greater than that of conventional aggregates, resulting in a highly durable mixture that is less susceptible to aggregate scattering, rutting, and cracking in the asphalt pavement.

次に本実施形態と従来例の製造方法によって製造された再生アスファルト混合物Ａの試験結果について説明する。
図１に示す実施形態による再生アスファルト混合物Ａの製造方法で得られた再生アスファルト混合物Ａと図４に示す従来例によるアスファルト混合物の製造方法で得られた再生アスファルト混合物について、動的安定度と疲労破壊回数の試験を行った。動的安定度とはアスファルト混合物の流動抵抗を示す指標であり、ホイールトラッキング試験において供試体となるアスファルト舗装面が１ｍｍ変形する(轍掘れ)のに要する車輪の通過回数を表す値である。疲労破壊回数とは、アスファルト混合物に繰り返し曲げ応力を加えることで、繰り返し曲げ試験により疲労でひび割れするまでの回数を表す値である。 Next, the test results of the recycled asphalt mixture A produced by the manufacturing method of this embodiment and the conventional example will be described.
Dynamic stability and fatigue failure count tests were performed on the recycled asphalt mixture A obtained by the manufacturing method of recycled asphalt mixture A according to the embodiment shown in Figure 1 and the recycled asphalt mixture obtained by the conventional manufacturing method of asphalt mixture shown in Figure 4. Dynamic stability is an index showing the flow resistance of the asphalt mixture, and is a value that represents the number of wheel passes required for the asphalt pavement surface to be subjected to a test specimen to deform by 1 mm (rutting) in a wheel tracking test. The fatigue failure count is a value that represents the number of times that the asphalt mixture is subjected to repeated bending stress until it cracks due to fatigue in a repeated bending test.

その試験結果は、図３の表１に示す通りである。
従来例では、動的安定度３７０６回／ｍｍ、疲労破壊回数９０１６回であるのに対し、実施例では、動的安定度７０００回／ｍｍ、疲労破壊回数１４９１０回となった。実施形態による再生アスファルト混合物Ａは、舗装の轍掘れやひび割れが起こりにくく高い耐久性を得られた。 The test results are shown in Table 1 in FIG.
In the conventional example, the dynamic stability was 3706 times/mm and the fatigue failure frequency was 9016 times, whereas in the example, the dynamic stability was 7000 times/mm and the fatigue failure frequency was 14910 times. The recycled asphalt mixture A according to the embodiment was less susceptible to rutting and cracking of the pavement, and high durability was obtained.

なお、本発明による再生アスファルト混合物Ａの製造方法は、上述した実施形態に限定されるものではなく、本発明の要旨を逸脱しない限り、上記実施形態の構成を適宜置換したり変更したりすることができる。以下に、本実施形態による再生アスファルト混合物Ａとその製造方法の変形例について説明するが、上述した実施形態と同一または同様なもの等については同一の符号を用いて説明する。 The manufacturing method of the recycled asphalt mixture A according to the present invention is not limited to the above-mentioned embodiment, and the configuration of the above-mentioned embodiment can be appropriately replaced or modified without departing from the gist of the present invention. Below, the recycled asphalt mixture A according to this embodiment and modified examples of the manufacturing method thereof are described, but the same reference numerals are used to describe the same or similar parts as those in the above-mentioned embodiment.

例えば、上述した実施形態では、再生アスファルト混合物Ａの製造方法において、加熱溶融した新規のアスファルトｃと再生用添加剤ｄ及び／または施工性改善剤との２種の材料を混合して再生用アスファルトを製造する第一の工程と、残りの1種の材料である第一の再生骨材ａと再生用アスファルトとを加熱混合してアスファルトモルタルを製造する第二の工程と、からなる二段階の工程を経由することで、アスファルトモルタルを製造した。 For example, in the above-described embodiment, in the manufacturing method of the recycled asphalt mixture A, the asphalt mortar is manufactured through a two-step process consisting of a first process of manufacturing recycled asphalt by mixing two materials, namely heated and melted new asphalt c and recycling additive d and/or workability improving agent, and a second process of manufacturing asphalt mortar by heating and mixing the remaining material, the first recycled aggregate a, with the recycled asphalt.

しかし、本発明はこのような方法に限定されない。例えば第一変形例として、アスファルトと再生用添加剤ｄ及び／または施工性改善剤と第一の再生骨材ａとを混合釜３に同時または順次投入して１０分以上攪拌混合することでアスファルトモルタルｅを製造してもよい。
或いは第二変形例として、第一の再生骨材ａと再生用添加剤ｄ及び／または施工性改善剤を混合釜３内に先に投入して混合し、その後に加熱溶融された新規のアスファルトｃを投入して１０分以上攪拌混合してもよい。 However, the present invention is not limited to such a method. For example, as a first modified example, asphalt, the additive for recycling d and/or the workability improving agent, and the first recycled aggregate a may be simultaneously or sequentially charged into the mixing vessel 3 and stirred and mixed for 10 minutes or more to produce asphalt mortar e.
Alternatively, as a second variant, the first recycled aggregate a and the recycling additive d and/or the workability improving agent may be first charged into the mixing vessel 3 and mixed, and then new asphalt c that has been heated and melted may be charged and stirred and mixed for 10 minutes or more.

これら第一及び第二変形例による製造方法では、再生用添加剤ｄ及び／または施工性改善剤を第一の再生骨材ａの表面に均等に付着させた後に加熱溶融された新規のアスファルトｃを攪拌混合できる。そのため、再生用添加剤ｄ及び／または施工性改善剤は第一の再生骨材ａの表面から旧アスファルトｃ１内部の深い所まで(好ましくは骨材ｋの表面まで)均一に混ざり合うため、再生アスファルト混合物Ａの品質が均一になる。 In the manufacturing methods according to these first and second modified examples, a new asphalt c is heated and melted after the recycling additive d and/or the workability improving agent are evenly adhered to the surface of the first recycled aggregate a. can be stirred and mixed. Therefore, the recycling additive d and/or the workability improving agent are uniformly mixed from the surface of the first recycled aggregate a to the deep inside of the old asphalt c1 (preferably to the surface of aggregate k). The quality of asphalt mixture A becomes uniform.

１ 再生アスファルト混合物の製造装置
２ アスファルト貯蔵サイロ
３ 混合釜
４、９ 攪拌羽根
８ ミキサー
１１ ダンプトラック
Ａ 再生アスファルト混合物
ａ 第一の再生骨材
ｂ 第二の再生骨材
ｃ アスファルト
ｃ１ 旧アスファルト
ｄ 再生用添加剤
ｅ アスファルトモルタル
ｆ 粗骨材
ｇ 細骨材
ｋ 骨材 1 Recycled asphalt mixture manufacturing device 2 Asphalt storage silo 3 Mixing kettle 4, 9 Mixing blade 8 Mixer 11 Dump truck A Recycled asphalt mixture a First recycled aggregate b Second recycled aggregate c Asphalt c1 Old asphalt d Recycled additive e Asphalt mortar f Coarse aggregate g Fine aggregate k Aggregate

Claims (5)

アスファルト廃材を破砕し、破砕した後の前記アスファルト廃材を、粒径５ｍｍ～０ｍｍの第一の再生骨材と、粒径１３ｍｍ～５ｍｍ超の第二の再生骨材とに分級する工程と、
加熱溶融した新規のアスファルトと再生用添加剤及び施工性改善剤とを加熱しながら混合した再生用アスファルトに、前記第一の再生骨材を、混合してアスファルトモルタルを製造する工程と、
前記アスファルトモルタルと、異なる加熱手段でそれぞれ加熱された前記第二の再生骨材及び新規骨材とを混合して再生アスファルト混合物を製造する工程と、を、有し、
前記第一の再生骨材および前記第二の再生骨材は、針入度が２０以上である旧アスファルトを３質量％以上含むことを特徴とする再生アスファルト混合物の製造方法。 A step of crushing the asphalt waste material and classifying the crushed asphalt waste material into a first recycled aggregate having a particle size of 5 mm to 0 mm and a second recycled aggregate having a particle size of 13 mm to more than 5 mm;
A step of producing asphalt mortar by mixing the first recycled aggregate with recycled asphalt obtained by mixing heated and melted new asphalt, a recycling additive , and a workability improving agent while heating;
A step of mixing the asphalt mortar with the second recycled aggregate and new aggregate, each of which has been heated by a different heating means, to produce a recycled asphalt mixture;
A method for producing a recycled asphalt mixture, characterized in that the first recycled aggregate and the second recycled aggregate contain 3 mass% or more of old asphalt having a penetration of 20 or more. 前記アスファルトモルタル製造時に、前記新規のアスファルトと加熱混合を行う前の前記第一の再生骨材は常温である請求項１に記載された再生アスファルト混合物の製造方法。 2. The method for producing a recycled asphalt mixture according to claim 1, wherein the first recycled aggregate is at room temperature before being heated and mixed with the new asphalt during the production of the asphalt mortar. 前記新規のアスファルト及び／または前記アスファルトモルタルに、発泡剤を含む水溶液を添加して発泡させることで容積を増大させ、粘性を低減させる請求項１または２に記載された再生アスファルト混合物の製造方法。 The method for producing a recycled asphalt mixture according to claim 1 or 2, in which an aqueous solution containing a foaming agent is added to the new asphalt and/or the asphalt mortar to cause foaming, thereby increasing the volume and reducing the viscosity. 前記アスファルトモルタルの製造時の加熱混合時間は１０分以上である請求項１から３のいずれか１項に記載された再生アスファルト混合物の製造方法。 The method for producing a recycled asphalt mixture according to any one of claims 1 to 3, wherein the heating and mixing time during the production of the asphalt mortar is 10 minutes or more. 請求項１～４のいずれか１項に記載された再生アスファルト混合物の製造方法に用いられる再生アスファルト混合物の製造装置であって、
加熱された新規のアスファルトと第一の再生骨材と再生用添加剤及び／または施工性改善剤とを加熱混合してアスファルトモルタルを製造する混合釜と、
前記アスファルトモルタルと前記第一の再生骨材より粒径の大きい第二の再生骨材及び／または新規骨材とを、攪拌混合することで再生アスファルト混合物を製造するミキサーと、
を備えたことを特徴とする再生アスファルト混合物の製造装置。 An apparatus for producing a recycled asphalt mixture used in the method for producing a recycled asphalt mixture according to any one of claims 1 to 4, comprising:
a mixing pot for producing an asphalt mortar by heating and mixing heated new asphalt, a first recycled aggregate, a recycling additive and/or a workability improving agent;
A mixer that produces a recycled asphalt mixture by stirring and mixing the asphalt mortar and a second recycled aggregate and/or new aggregate that has a larger particle size than the first recycled aggregate;
An apparatus for producing recycled asphalt mixture, characterized by comprising:
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Publication number Priority date Publication date Assignee Title
JP2002079136A (en) 2000-07-06 2002-03-19 Fukui Keisuke Process for producing recyclable asphalt mixture
JP2008208606A (en) 2007-02-26 2008-09-11 Nippo Corporation:Kk Recycled aggregate manufacturing method and recycled porous asphalt mixture manufacturing method
JP2009249991A (en) 2008-04-10 2009-10-29 Nikko Co Ltd Manufacturing method for asphalt mixture and its device
JP2019044367A (en) 2017-08-30 2019-03-22 世紀東急工業株式会社 Apparatus for producing recycled heated asphalt mixture and method for producing recycled heated asphalt mixture

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JPS6011169B2 (en) * 1980-12-08 1985-03-23 東京工機株式会社 asphalt plant

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002079136A (en) 2000-07-06 2002-03-19 Fukui Keisuke Process for producing recyclable asphalt mixture
JP2008208606A (en) 2007-02-26 2008-09-11 Nippo Corporation:Kk Recycled aggregate manufacturing method and recycled porous asphalt mixture manufacturing method
JP2009249991A (en) 2008-04-10 2009-10-29 Nikko Co Ltd Manufacturing method for asphalt mixture and its device
JP2019044367A (en) 2017-08-30 2019-03-22 世紀東急工業株式会社 Apparatus for producing recycled heated asphalt mixture and method for producing recycled heated asphalt mixture

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