JP2021050470A - Recycled asphalt mixture production method and recycled asphalt mixture production device - Google Patents

Recycled asphalt mixture production method and recycled asphalt mixture production device Download PDF

Info

Publication number
JP2021050470A
JP2021050470A JP2019172000A JP2019172000A JP2021050470A JP 2021050470 A JP2021050470 A JP 2021050470A JP 2019172000 A JP2019172000 A JP 2019172000A JP 2019172000 A JP2019172000 A JP 2019172000A JP 2021050470 A JP2021050470 A JP 2021050470A
Authority
JP
Japan
Prior art keywords
asphalt
aggregate
regenerated
mixing
producing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2019172000A
Other languages
Japanese (ja)
Other versions
JP7460342B2 (en
Inventor
義伸 志賀
Yoshinobu Shiga
義伸 志賀
俊史 末原
Toshifumi Suehara
俊史 末原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippo Corp
Original Assignee
Nippo Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippo Corp filed Critical Nippo Corp
Priority to JP2019172000A priority Critical patent/JP7460342B2/en
Publication of JP2021050470A publication Critical patent/JP2021050470A/en
Application granted granted Critical
Publication of JP7460342B2 publication Critical patent/JP7460342B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Landscapes

  • Road Paving Machines (AREA)

Abstract

To provide a recycled asphalt mixture production method and recycled asphalt mixture capable of exhibiting more excellent durability.SOLUTION: A recycled asphalt is produced by heating and mixing a new heat-melted asphalt c and a recycling additive d and/or a workability improving agent in a mixing pot 3. Next, a first recycled aggregate a having a particle size of 5 mm or less is put into the mixing pot 3 and heated and mixed to produce an asphalt mortar e. Three kinds of material can be uniformly mixed by heating and mixing a stirring blade 4 for 10 minutes to 1 hour in the mixing pot 3. A second recycled aggregate b and/or a new coarse aggregate f and the asphalt mortar e having a particle size of more than 13 mm to 5 mm are put into a mixer 8, and a recycled asphalt mixture A is produced by stirring and mixing with a stirring blade 9. Additionally, a stone powder, a filler, and the new asphalt c that may be running short can be supplied into the mixer 8.SELECTED DRAWING: Figure 1

Description

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 regenerated asphalt mixture using a regenerated asphalt aggregate and an apparatus for producing a regenerated 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 material of an asphalt mixture applied to the surface layer and the base layer of asphalt pavement. This recycled asphalt aggregate is used as a material for a recycled asphalt mixture, and is widely applied to asphalt paved roads as a recycled asphalt mixture by mixing new asphalt and new aggregate.
For example, in the conventional method for producing a regenerated asphalt mixture, as shown in FIG. 4, 100 regenerated asphalt aggregates (hereinafter, simply referred to as regenerated aggregates) 100 are heated by a dryer 101. Then, the heated regenerated aggregate 100 is put into a mixer 105 together with the heated new fine aggregate 102, coarse aggregate 103, and new asphalt 104 and mixed by stirring to produce a regenerated asphalt mixture, and the regenerated asphalt pavement is produced. It is laid on the road surface.

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。
In the recycled aggregate 100, the surface of the waste aggregate is covered with the old asphalt. By repeatedly regenerating the recycled aggregate 100 of the asphalt pavement, the asphalt deteriorates due to reheating during manufacturing and ultraviolet rays during operation, and the oil content falls off. Therefore, the performance of the recycled asphalt mixture mixed with the recycled aggregate 100 and the like gradually increases. It will deteriorate. Then, there arises a problem that ruts and cracks occur in the recycled asphalt pavement in a short period of time.
In order to solve this problem, for example, in the regenerated aggregate described in Patent Document 1, the amount of the adhering oil is reduced by scraping the surface to which the oil is adhering, and the regenerated aggregate is added for regeneration in the subsequent heating step. By adding an agent and mixing it with new asphalt, the performance of the regenerated asphalt mixture will be improved.

特開2009−102883号公報Japanese Unexamined Patent Publication No. 2009-102883

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, it cannot be said that the performance of the regenerated asphalt mixture described in Patent Document 1 is sufficiently restored. Therefore, even in this case, there arises a problem that aggregates are scattered or cracked 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 such circumstances, and an object of the present invention is to provide a method for producing a regenerated asphalt mixture and an apparatus for producing a regenerated asphalt mixture, which can exhibit more excellent 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 regenerated asphalt mixture according to the present invention comprises a step of mixing a new heat-melted asphalt, a regenerating additive and / or a workability improving agent, and a first regenerated aggregate to produce an asphalt mortar. , Characterized by having.
According to the present invention, the first asphalt mortar is produced by mixing three kinds of materials, a novel heat-melted asphalt, a regeneration additive and / or a workability improver, and a first recycled aggregate. It is possible to produce asphalt mortar in which the flexibility and durability of the old asphalt that adheres to the recycled aggregate is restored.

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 producing a regenerated asphalt mixture by mixing the asphalt mortar produced by the above-mentioned production method with a second regenerated aggregate and / or a new aggregate having a particle size larger than that of the first regenerated aggregate. It is preferable to have more.
According to the present invention, a regenerating additive and / or a workability improving agent is adhered to and permeated on the surface of the first regenerated aggregate, and the asphalt is heated and mixed so that the asphalt can be mixed more uniformly. Since the flexibility and durability of the old asphalt that adheres to the recycled aggregate can be restored, a highly durable mixture that is less likely to be digged or cracked in the asphalt pavement can be obtained.

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。
Further, the first regenerated aggregate preferably 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 stable, and asphalt can be efficiently mixed by heating and mixing the regenerating additive and / or the workability improving agent, and the asphalt with stable quality. Can produce 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。
In addition, the first regenerated aggregate may contain 3% or more of old asphalt.
Since the surface of the first regenerated aggregate contains 3% or more of old asphalt, the regenerating additive and / or the workability improving agent permeates evenly and mixes uniformly to increase the oil content and provide flexibility. Durability can be restored and quality is 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。
Further, during the production of asphalt mortar, the first regenerated aggregate before heat mixing with new asphalt is at room temperature.
Since the first recycled aggregate is at room temperature, it 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。
In addition, the asphalt mortar may have a step of producing a regenerated asphalt mixture by mixing a second regenerated aggregate having a particle size of more than 5 mm and / or a heated new aggregate. preferable.
A regenerated asphalt mixture can be produced by mixing the heated second regenerated aggregate and / or the 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。
Further, 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 foam the asphalt.
Foaming in recycled asphalt and / or asphalt mortar causes the foam to act as a bearing and improve 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。
Further, the heating and mixing time at the time of producing the asphalt mortar is preferably 10 minutes or more.
By heating and mixing for 10 minutes or more during the production of asphalt mortar, the new asphalt, the first regenerated aggregate, the regenerating additive and / or the workability improving agent can be mixed more uniformly and sufficiently, and the quality is stable. ..

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 a regenerated asphalt mixture according to the present invention includes a mixing kettle for producing asphalt mortar by heating and mixing a newly heated asphalt, a first regenerated aggregate, a regenerating additive and / or a workability improving agent. , A mixer for producing a regenerated asphalt mixture by stirring and mixing asphalt mortar and a second regenerated aggregate and / or a new aggregate having a larger particle size than the first regenerated aggregate. And.
According to the present invention, by producing asphalt mortar containing the first regenerated 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 regenerated aggregate can be restored. Further, by stirring and mixing the second regenerated aggregate and / or the new aggregate with a mixer, an asphalt mixture having 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 method and apparatus for producing a recycled asphalt mixture according to the present invention, the heated and melted asphalt is mixed with a regeneration additive and / or a workability improving agent, and the asphalt is heated and mixed with the first recycled aggregate. Since the mortar is produced, the flexibility and durability of the first regenerated aggregate can be restored by the regenerating additive and / or the workability improving agent, and the properties of the asphalt mortar containing the first regenerated aggregate are made uniform. High strength. Therefore, the asphalt pavement is suppressed from scattering and cracking of aggregate for a long period of time, and the durability is improved.

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。It is a schematic diagram which shows the manufacturing apparatus and manufacturing method of the regenerated asphalt mixture by embodiment of this 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。The figure which added the regeneration additive to the first regenerated aggregate is shown, (a) is the figure of the asphalt regenerated aggregate, (b) is the conventional example which added the regenerating additive to the asphalt regenerated aggregate. (C) is a diagram of an embodiment in which a regeneration additive is added to the recycled asphalt 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 regenerated asphalt mixture 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。It is a schematic diagram which shows the manufacturing apparatus and manufacturing method of the regenerated asphalt mixture by 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, the apparatus 1 and the manufacturing method of the recycled asphalt mixture according to the embodiment of the present invention will be described with reference to the accompanying drawings.
First, as the recycled aggregate to be added to produce the recycled asphalt mixture A, the asphalt waste material excavated at the time of repairing or replacing the existing asphalt pavement is crushed to an appropriate size to produce the recycled asphalt aggregate. To do. The crushed regenerated asphalt aggregate is said to have a particle size in an appropriate range, for example, a particle size in the range of 13 mm to 0 mm. Then, this asphalt regenerated aggregate has, for example, a first regenerated aggregate (fine aggregate) a having a particle size of 5 mm or less, that is, a particle size of 5 mm to 0 mm, and a particle size of 13 mm to more than 5 mm by a sieve having a mesh of 6.3 mm. It shall be classified into the second regenerated aggregate (coarse aggregate) b. The first regenerated aggregate a and the second regenerated aggregate b contain an amount of old asphalt of 3% by mass or more.

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 a regenerated asphalt mixture A according to an embodiment of the present invention. The manufacturing apparatus 1 of the regenerated asphalt mixture A is for heating and mixing the asphalt storage silo 2 capable of accommodating and heating the new asphalt c, the asphalt c, the regenerating additive d, and the first regenerated aggregate a. It is equipped with a mixing kettle 3. The mixing pot 3 has a built-in stirring blade 4 for stirring the asphalt c, the regenerating additive d, and the first regenerated aggregate a. The amount of new asphalt c to be put into the mixing pot 3 is preferably about 5 to 20% of the total amount. A workability improving agent may be added in place of the regeneration additive d or together with the regeneration 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 method for producing the regenerated asphalt mixture A according to the present embodiment, the first heated asphalt c and the regenerating additive d are put into the mixing pot 3 and stirred and mixed while heating, and then the first regenerated bone. The asphalt mortar e that is uniform throughout is produced by putting the material a into the mixing pot 3 and further stirring and mixing for a predetermined time. Alternatively, the regeneration additive d, the first regenerated aggregate a, and the asphalt c may be put into the mixing pot 3 at the same time or before and after, and mixed by the stirring blade 4.
The mixing time in the mixing pot 3 in the step of producing the asphalt mortar e is 10 minutes or more, for example, about 10 minutes to 1 hour. Separately from the mixer 8 described later, the regenerating additive d and / or the workability improving agent, the first regenerated aggregate a and the asphalt c are mixed with the stirring blade 4 for a longer time than before, so that the asphalt and the first one can be mixed. The regenerated aggregate can be sufficiently impregnated with the regenerating additive d and / or the workability improving agent 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 generally used for pavement such as straight asphalt, blown asphalt, modified asphalt to which rubber, polymer, etc. are added can be adopted.
Further, the recycling additive d is an additive having an effect of restoring properties such as flexibility to the old asphalt c1 which is a waste asphalt material, and examples thereof include petroleum lubricating oil-based ones such as mineral oil, for example, RDEX (JXTG). There are RJ-1 (manufactured by Santoku Asphalt Co., Ltd.), RJ-T (manufactured by Takenaka Sangyo Co., Ltd.), etc. The component of the regeneration additive d contains a saturated component, an aromatic component, and a resin component. The amount of the regenerating additive d added is preferably 0.1% by mass or more with respect to the total mass of the first regenerated 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。
Further, the workability improving agent is an additive that improves the workability of the regenerated asphalt mixture A, and specifically, can reduce the viscosity of the regenerated asphalt mixture A. Therefore, the work of laying out the recycled asphalt mixture A using a pavement tool such as a shovel or a rake becomes easy. Examples of the workability improving agent include animal and vegetable oil-based compounds and petroleum-based compounds, and examples thereof include 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 with respect to the total mass of the first regenerated aggregate a.
When both the regeneration additive d and the workability improving agent are used, the amount of each addition is set according to the ratio.

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。
Further, the apparatus 1 for producing the regenerated asphalt mixture A is provided with a first dryer 5 for heating a new coarse aggregate (gravel) f and fine aggregate (sand) g. Further, a second dryer 6 for heating the above-mentioned second regenerated aggregate b is provided. The second regenerated aggregate b has a particle size in the range of 13 mm to more than 5 mm. A mixer 8 for charging and stirring and mixing the heated coarse aggregate f and fine aggregate g, the second regenerated aggregate b, and the asphalt mortar e that has been stirred and mixed in the mixing pot 3 is provided.
As the coarse aggregate, only one or both of the second regenerated aggregate b and the new coarse aggregate f can be added. Further, since the first regenerated aggregate a is used as the fine aggregate, it is not necessary 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. Further, the remaining new asphalt c is put 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 regenerated asphalt mixture A obtained by stirring by the stirring blades 9 in the mixer 8 for a predetermined time is dropped onto, for example, a dump truck 11 and transported to a construction site of asphalt pavement. Alternatively, the regenerated asphalt mixture A may be discharged directly from the mixer 8 at the site 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 composed of the first recycled aggregate a and the second recycled aggregate b is made by crushing the asphalt waste material generated at the time of repairing or replacing the existing asphalt pavement to an appropriate size. Is. Asphalt c contains four components, a saturated component, an aromatic component, a resin component, and asphalt (carbon), and has the property that the saturated content decreases and the asphalt content increases as the asphalt c becomes older after repeated regeneration. This is referred to as old asphalt c1. The regenerated asphalt aggregate contains the aggregate and the old asphalt c1 attached to the aggregate.
Moreover, the degree of needle insertion (1/10 mm) of this old asphalt c1 is preferably 20 or more. The degree of needle insertion is an index showing the hardness of the collected asphalt, and is measured by the degree of needle insertion test. Further, the crushing coefficient (MPa) of the old asphalt c1 is preferably 1.70 or less. The crushing coefficient is an index showing the viscoelasticity (tenacity and softness) of the regenerated asphalt aggregate, and is measured by the crushing 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 method for producing the regenerated asphalt mixture A according to the present embodiment using the production apparatus 1 will be described with reference to FIGS. 1 and 2.
First, as a pre-process, asphalt recycled aggregate is produced by crushing the asphalt waste material dug up at the time of repairing or replacing the existing asphalt pavement to an appropriate size. The particles of the crushed asphalt regenerated aggregate have a particle size in the range of, for example, 13 mm to 0 mm. This recycled asphalt aggregate contains 3% by mass or more of old asphalt, usually about 5 to 6% by mass.
The regenerated asphalt aggregate has, for example, the shape shown in FIG. 2 (a). The old asphalt c1 and the fine aggregate (sand) a1 adhere to the surface of the massive aggregate k made of the first regenerated aggregate a or the second regenerated aggregate b and are appropriately covered with a thickness. This asphalt regenerated aggregate is classified into a first regenerated aggregate a having a particle size of 0 to 5 mm or less and a second regenerated aggregate b having a particle size of 13 mm to more than 5 mm by, for example, a sieve having a mesh of 6.3 mm. By classifying the recycled aggregate, the particle size is stable 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。 At the time of classification, more first recycled aggregate a can be taken out by passing the recycled asphalt aggregate through a rectifier, a crusher, or the like. When classifying the recycled asphalt aggregate, it is not always necessary to classify the asphalt regenerated aggregate with a particle size of 5 mm, for example, a particle size of 6 mm or the like may be used. However, if the particle size of the regenerated asphalt aggregate is made larger than 5 mm, it is necessary to increase the regenerating additive d as well, and if it is set to 5 mm or less, the amount of asphalt c contained increases, so that the regenerating additive d can be efficiently adsorbed. ..

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 part of the new asphalt c housed in the asphalt storage silo 2 is heated and melted and administered into the mixing pot 3, and the regeneration additive d and / or the workability improving agent is added to the mixing pot 3. throw into. By stirring and mixing these new asphalt c with the regenerating additive d and / or the workability improving agent by the stirring blade 4, the regenerating asphalt in which the regenerating additive d and / or the workability improving agent is evenly dispersed can be obtained. To manufacture.
Then, after the first regenerated aggregate a having a particle size of 5 mm or less is put into the mixing pot 3, the regenerated asphalt and the first regenerated aggregate a are heated and mixed by the stirring blade 4 for example, for 10 minutes or more. To do. By heating and mixing for 10 minutes or more, the regenerated asphalt and the first regenerated aggregate a are uniformly mixed. As a result, asphalt mortar e can be produced. Asphalt c contains odorous components such as hydrogen sulfide and aldehyde, but by heating in the mixing pot 3, the odor is less likely 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 setting the particle size of the first regenerated aggregate a to be mixed with the regenerated asphalt to 5 mm or less, the mixing efficiency with the regenerated asphalt is improved, and the mixture can be uniformly mixed in a short time. Conventionally, the first regenerated aggregate a is heated with a burner or the like and then heated and mixed with the regenerated asphalt, but in the present embodiment, it is mixed at room temperature. Since the first regenerated aggregate a is at room temperature, it can be stored without heating.
By classifying the regenerated asphalt aggregate with a particle size of about 5 mm, the amount of the first regenerated aggregate a increases, and the asphalt mortar can be efficiently produced in one batch by efficiently mixing with the asphalt c. Moreover, the first regenerated aggregate a adsorbs the regenerating additive d and / or the workability improving agent, has good mixing efficiency, is less susceptible to heat deterioration, and can shorten the production time of asphalt mortar with high quality.

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. 2A, the first regenerated aggregate a has the old asphalt c1 and the fine aggregate a1 on the surface of the aggregate k (fine aggregate or coarse aggregate) having a particle size of 5 mm or less. It adheres in layers. In the conventional manufacturing method, as shown in FIG. 2 (b), the first regenerated aggregate a is the regenerated additive d and / or the workability improving agent adhered to and coated on the surface of the aggregate k is the old asphalt. It takes time to penetrate inside c1. Then, the aggregate k, the old asphalt c1 and the fine aggregate a1 are hardened by heat, and the regeneration additive d and / or the workability improving agent adheres to the surface to form a film, and sufficiently penetrates into the inside of the old asphalt c1. do not do. Therefore, the surface of the first regenerated aggregate a is slippery and the dynamic stability is small, and its properties are not sufficiently 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。 On the other hand, in the present embodiment, as shown in FIG. 2C, the regeneration additive d and / or the workability improving agent coated on the surface of the first recycled aggregate a is inside the old asphalt c1. It penetrates and becomes oily and soft. In this case, the regenerating additive d and / or the workability improving agent does not need to penetrate into the aggregate k of the first regenerated aggregate a, but from the surface to a deep part inside the old asphalt c1 (preferably bone). Since the mixture is uniformly mixed (up to the surface of the material k), the quality of the recycled asphalt mixture A is improved.

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。 Further, in the mixing pot 3, a new asphalt, recycled asphalt or asphalt mortar may be foamed by adding an aqueous solution containing a foaming agent. By adding a foaming agent and stirring and mixing, the foam material foams to increase the volume and act as a bearing to expand the asphalt, reduce the viscosity and improve the mixing property.

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 pot 3 is charged into the mixer 8.
On the other hand, the coarse aggregate f, which is a new aggregate, is heated by the first dryer 5. Further, the second regenerated aggregate b made of coarse aggregate having a particle size of 13 mm to more than 5 mm is heated by the second dryer 6. Then, one or both of the new coarse aggregate f and the second regenerated aggregate b are put into the mixer 8, and the stone powder is also put into the mixer 8. Although the new fine aggregate g is hardly put into the mixer 8, a small amount may be put into the mixer 8. Further, the shortage of new asphalt c is heated and melted and put into the mixer 8.
Then, the new coarse aggregate f and / or the second regenerated aggregate b and the like are stirred and mixed with the asphalt mortar e by the stirring blade 9 in the mixer 8 to produce the regenerated asphalt mixture A. When producing the regenerated asphalt mixture A in the mixer 8, a material generally used for 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, in the production apparatus 1 and the production method of the regenerated asphalt mixture A according to the present embodiment, the particle size of the regenerated asphalt in which the regenerating additive d and / or the workability improving agent is uniformly mixed with the asphalt c The first regenerated aggregate a having a size of 5 mm or less is added and mixed for 10 minutes or more to produce asphalt mortar e.
As a result, the regenerating additive d and / or the workability improving agent evenly permeates the old asphalt c1 adhering to the surface of the first regenerated aggregate a, and the first regenerated aggregate a is more flexible than the conventional one. Since the property and durability can be restored, a highly durable mixture that is less likely to cause aggregate scattering, rut digging and cracking of asphalt pavement can be obtained.

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 regenerated asphalt mixture A produced by the present embodiment and the conventional production method will be described.
Dynamic stability and fatigue of the regenerated asphalt mixture A obtained by the method for producing the regenerated asphalt mixture A according to the embodiment shown in FIG. 1 and the regenerated asphalt mixture obtained by the method for producing the regenerated asphalt mixture according to the conventional example shown in FIG. The number of destruction tests was conducted. The dynamic stability is an index indicating the flow resistance of the asphalt mixture, and is a value indicating the number of times the wheel has passed for the asphalt pavement surface to be the specimen to be deformed by 1 mm (rut digging) in the wheel tracking test. The number of fatigue fractures is a value representing the number of times until cracks are caused by fatigue in the repeated bending test by repeatedly applying bending stress to the asphalt mixture.

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 as shown in Table 1 of FIG.
In the conventional example, the dynamic stability was 3706 times / mm and the number of fatigue fractures was 9016 times, whereas in the example, the dynamic stability was 7000 times / mm and the number of fatigue fractures was 14910 times. The regenerated asphalt mixture A according to the embodiment was resistant to rutting and cracking of the pavement and obtained high durability.

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 method for producing the regenerated asphalt mixture A according to the present invention is not limited to the above-described embodiment, and the configuration of the above-described embodiment may be appropriately replaced or changed without departing from the gist of the present invention. Can be done. Hereinafter, a modified example of the regenerated asphalt mixture A and the method for producing the regenerated asphalt mixture A according to the present embodiment will be described, but the same or similar to the above-described embodiment will be described using the same reference numerals.

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 method for producing the regenerated asphalt mixture A, two kinds of materials, a new heat-melted asphalt c and a regenerating additive d and / or a workability improving agent, are mixed and regenerated asphalt. A two-step process consisting of a first step of manufacturing the asphalt mortar and a second step of heating and mixing the remaining one kind of material, the first recycled aggregate a and the recycled asphalt. Asphalt mortar was produced by going through the process.

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 modification, asphalt is added to the mixing pot 3 simultaneously or sequentially with the asphalt, the regenerating additive d and / or the workability improving agent and the first regenerated aggregate a, and the asphalt is stirred and mixed for 10 minutes or more. Mortar e may be produced.
Alternatively, as a second modification, the first regenerated aggregate a, the regenerating additive d and / or the workability improving agent are first put into the mixing pot 3 and mixed, and then the new asphalt is heated and melted. You may add c and stir and mix 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 production methods according to the first and second modifications, the regenerating additive d and / or the workability improving agent is evenly adhered to the surface of the first regenerated aggregate a, and then the new asphalt c is heated and melted. Can be stirred and mixed. Therefore, the regenerating additive d and / or the workability improving agent is uniformly mixed from the surface of the first regenerated aggregate a to a deep part inside the old asphalt c1 (preferably to the surface of the aggregate k), and thus regenerated. The quality of the 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 equipment 2 Asphalt storage silo 3 Mixing pots 4, 9 Stirring blades 8 Mixer 11 Dump truck A Recycled asphalt mixture a First recycled aggregate b Second recycled aggregate c Asphalt c1 Old asphalt d For recycling Additive e Asphalt mortar f Coarse aggregate g Fine aggregate k Aggregate

Claims (9)

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再生アスファルト混合物の製造方法。 Production of a regenerated asphalt mixture, which comprises a step of mixing a new heat-melted asphalt, a regenerating additive and / or a workability improving agent, and a first regenerated aggregate to produce an asphalt mortar. Method. 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混合して再生アスファルト混合物を製造する工程を、有する請求項1に記載された再生アスファルト混合物の製造方法。 The first aspect of claim 1 has a step of producing a regenerated asphalt mixture by mixing the asphalt mortar with a second regenerated aggregate and / or a new aggregate having a particle size larger than that of the first regenerated aggregate. A method for producing a recycled asphalt mixture. 前記第一の再生骨材は、粒径が5mm以下である請求項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 regenerated asphalt mixture according to claim 1 or 2, wherein the first regenerated aggregate has a particle size of 5 mm or less. 前記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 first recycled aggregate contains 3% or more of old asphalt. 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から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。 The method for producing a regenerated asphalt mixture according to any one of claims 1 to 4, wherein the first regenerated aggregate before heat mixing with the new asphalt during the production of the asphalt mortar is at room temperature. 前記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、
有している請求項1から5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。
A step of producing a regenerated asphalt mixture by mixing a second regenerated aggregate having a particle size of more than 5 mm and / or a heated new aggregate with the asphalt mortar.
The method for producing a recycled asphalt mixture according to any one of claims 1 to 5.
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から6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 regenerated asphalt according to any one of claims 1 to 6, wherein the novel asphalt and / or the asphalt mortar is foamed by adding an aqueous solution containing a foaming agent to increase the volume and reduce the viscosity. Method for producing a mixture. 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7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 regenerated asphalt mixture according to any one of claims 1 to 7, wherein the heating and mixing time at the time of producing the asphalt mortar is 10 minutes or more. 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。
A mixing kettle for producing asphalt mortar by heating and mixing a new heated asphalt, a first regenerated aggregate, a regenerating additive and / or a workability improving agent,
A mixer for producing a regenerated asphalt mixture by stirring and mixing the asphalt mortar and a second regenerated aggregate and / or a new aggregate having a particle size larger than that of the first regenerated aggregate.
A device for producing a recycled asphalt mixture, which is characterized by being equipped with.
JP2019172000A 2019-09-20 2019-09-20 Manufacturing method and device for manufacturing recycled asphalt mixture Active JP7460342B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2019172000A JP7460342B2 (en) 2019-09-20 2019-09-20 Manufacturing method and device for manufacturing recycled asphalt mixture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2019172000A JP7460342B2 (en) 2019-09-20 2019-09-20 Manufacturing method and device for manufacturing recycled asphalt mixture

Publications (2)

Publication Number Publication Date
JP2021050470A true JP2021050470A (en) 2021-04-01
JP7460342B2 JP7460342B2 (en) 2024-04-02

Family

ID=75157223

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2019172000A Active JP7460342B2 (en) 2019-09-20 2019-09-20 Manufacturing method and device for manufacturing recycled asphalt mixture

Country Status (1)

Country Link
JP (1) JP7460342B2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5796106A (en) * 1980-12-08 1982-06-15 Tokyo Koki Kk Asphalt plant
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5796106A (en) * 1980-12-08 1982-06-15 Tokyo Koki Kk Asphalt plant
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

Also Published As

Publication number Publication date
JP7460342B2 (en) 2024-04-02

Similar Documents

Publication Publication Date Title
Tahami et al. Usage of two biomass ashes as filler in hot mix asphalt
Nanjegowda et al. Recyclability of rubber in asphalt roadway systems: A review of applied research and advancement in technology
Presti Recycled tyre rubber modified bitumens for road asphalt mixtures: A literature review
CN106046810B (en) Pitch binder and bituminous concrete performance are improved using heavy oil flying dust
JP7163113B2 (en) Method for producing recycled asphalt mixture and recycled asphalt mixture
NL2010586C2 (en) Mastic composition for asphalt mixtures and process for making such a mastic composition.
CN106661258B (en) Foam Sulphur asphalt for pavement recycling and soil stabilization
Akisetty Evaluation of warm asphalt additives on performance properties of CRM binders and mixtures
Lastra-González et al. Porous asphalt mixture with alternative aggregates and crumb-rubber modified binder at reduced temperature
KR100986718B1 (en) Modified asphalt composition used in treated fine waste EPDM powder
Saed et al. Performance evaluation of stone matrix asphalt mixtures and low-temperature properties of asphalt binders containing reclaimed asphalt pavement materials modified with nanosilica
CN112074578A (en) Engineered crumb rubber compositions for asphalt binders and paving mix applications
Movilla-Quesada et al. Reduction in the use of mineral aggregate by recycling cellulose ashes to decrease the aging of hot asphalt mixtures
JP5160595B2 (en) Asphalt mixture for thin layer pavement and method for repairing pavement surface using the same
KR102226750B1 (en) Modifier for recycling asphalt mixture and recycling modified asphalt mixture to which the same added
Batari et al. Rutting assessment of crumb rubber modifier modified warm mix asphalt incorporating warm asphalt additive
JP7460342B2 (en) Manufacturing method and device for manufacturing recycled asphalt mixture
Tessema et al. Experimental Evaluation of Coffee Husk Ash as a Filler in Hot Mix Asphalt Concrete Productions
NL2012307C2 (en) Asphalt composition and process for preparing such a composition.
Khan et al. Effects of crumb rubber and styrene-butadiene rubber additives on the properties of asphalt binder and the Marshall performance properties of asphalt mixtures
Sunarjono et al. Mixture design consideration for foamed asphalt using RAP materials
Kocak Cost-Effective Use of Reclaimed Asphalt Mixtures with Various Rubber Modification Technologies for Pavement Maintenance Applications
Munir et al. Activated Crumb Rubber Modified Binder as a Sustainable Paving Material: Pavement Performance Consideration
Prasad et al. Bitumen modification with waste plastic and crumb rubber
KR100640029B1 (en) Recycled superior hot mix asphalt for paving road

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20220916

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20230516

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20230523

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20230724

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20231010

A601 Written request for extension of time

Free format text: JAPANESE INTERMEDIATE CODE: A601

Effective date: 20231211

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20240209

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20240305

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20240321

R150 Certificate of patent or registration of utility model

Ref document number: 7460342

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150