JP2020037798A - Recycled asphalt mixture manufacturing method and recycled asphalt mixture - Google Patents

Recycled asphalt mixture manufacturing method and recycled asphalt mixture Download PDF

Info

Publication number
JP2020037798A
JP2020037798A JP2018164924A JP2018164924A JP2020037798A JP 2020037798 A JP2020037798 A JP 2020037798A JP 2018164924 A JP2018164924 A JP 2018164924A JP 2018164924 A JP2018164924 A JP 2018164924A JP 2020037798 A JP2020037798 A JP 2020037798A
Authority
JP
Japan
Prior art keywords
asphalt
aggregate
recycled
asphalt mixture
additive
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
JP2018164924A
Other languages
Japanese (ja)
Other versions
JP7163113B2 (en
Inventor
誠也 門田
Seiya Monden
誠也 門田
章吾 吉田
Shogo Yoshida
章吾 吉田
雅義 吉田
Masayoshi Yoshida
雅義 吉田
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 JP2018164924A priority Critical patent/JP7163113B2/en
Publication of JP2020037798A publication Critical patent/JP2020037798A/en
Application granted granted Critical
Publication of JP7163113B2 publication Critical patent/JP7163113B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Landscapes

  • Road Paving Machines (AREA)

Abstract

To provide a recycled asphalt mixture manufacturing method and recycled asphalt mixture capable of exhibiting further excellent durability.SOLUTION: A recycled asphalt mixture manufacturing method includes the steps of: adding a regeneration additive and/or a workability improving agent to an asphalt recycled aggregate a by an injector at normal temperature or by heating; and curing the asphalt recycled aggregate a for 3 days or more. Thereby, the regeneration additive and/or the workability improving agent penetrate(s) deeply into the old asphalt and improve(s) the properties of the asphalt recycled aggregate a. The cured asphalt recycled aggregate a is dried by heating. Then, the asphalt recycled aggregate a is charged into a mixer 5 together with a novel coarse aggregate b, a fine aggregate d, a filler such as stone powder, and a novel asphalt c, and mixed, whereby a recycled asphalt mixture A can be manufactured.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その製法で得られた再生アスファルト混合物に関する。   The present invention relates to a method for producing a recycled asphalt mixture using asphalt recycled aggregate, and a recycled asphalt mixture obtained by the method.

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、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、アスファルト再生骨材をドライヤで加熱する。そして、加熱した再生骨材を、加熱した新規の細骨材及び粗骨材、新規のアスファルトと共にミキサーに投入して混合することで、再生アスファルト混合物を製造している。 2. Description of the Related Art In recent years, asphalt recycled aggregate is manufactured by crushing waste materials of an asphalt mixture applied to a surface layer and a base layer of asphalt pavement. This recycled asphalt aggregate is used as a material for a recycled asphalt mixture, and is widely used on asphalt-paved roads.
For example, in a conventional method for producing a recycled asphalt mixture, asphalt recycled aggregate is heated by a dryer. Then, the heated regenerated aggregate is put into a mixer together with the heated new fine aggregate, coarse aggregate, and new asphalt and mixed to produce a regenerated asphalt mixture.

しかし、アスファルト舗装のアスファルト再生骨材を繰り返して再生することにより、再生アスファルト混合物は従来の再生アスファルト混合物よりも次第に性能が劣化してしまい、短期間で再生アスファルト舗装に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。 However, by repeatedly regenerating asphalt recycled aggregate on asphalt pavement, the performance of the regenerated asphalt mixture gradually deteriorates compared to the conventional regenerated asphalt mixture, and rutted or cracked regenerated asphalt pavement occurs in a short period of time Problem arises.
In order to solve this problem, for example, in the recycled aggregate described in Patent Document 1, the amount of the attached oil is reduced by scraping off the surface to which the oil is attached, and in the subsequent heating step, the recycled aggregate is added to the recycled aggregate. By adding an agent and mixing with asphalt, the performance of the recycled asphalt mixture 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轍掘れ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 does not have sufficient performance. Therefore, even in this case, there arises a problem that rutted pits, cracks, and the like occur on 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 recycled asphalt mixture and a recycled asphalt mixture that 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、常温下で、または加温して、アスファルト再生骨材に再生用添加剤及び／または施工性改善剤を添加する工程と、アスファルト再生骨材を養生する工程と、養生後のアスファルト再生骨材と新規の骨材及び新規のアスファルトを混合する工程と、を備えたことを特徴とする。
本発明によれば、常温下で、または加温して、アスファルト再生骨材に再生用添加剤及び／または施工性改善剤を添加することで、アスファルト再生骨材に対して再生用添加剤及び／または施工性改善剤が旧アスファルト内部に深く浸透するため、アスファルト舗装における車両等による轍掘れを抑制して動的安定度が良好で、ひび割れを起こしにくく疲労破壊回数が大きい。 The method for producing a recycled asphalt mixture according to the present invention includes a step of adding a regeneration additive and / or a workability improving agent to the asphalt recycled aggregate at room temperature or by heating, and curing the asphalt recycled aggregate. And a step of mixing the cured asphalt recycled aggregate with the new aggregate and the new asphalt.
According to the present invention, by adding a regeneration additive and / or a workability improving agent to the asphalt regenerated aggregate at normal temperature or by heating, the regeneration additive and the asphalt regenerated aggregate are added to the asphalt regenerated aggregate. Since the workability improving agent penetrates deeply into the old asphalt, it suppresses rut digging by asphalt pavement by a vehicle or the like, has good dynamic stability, hardly causes cracks, and has a large number of fatigue failures.

また、アスファルト再生骨材を養生する工程は３日以上とすることが好ましい。
アスファルト再生骨材に再生用添加剤及び／または施工性改善剤を添加して養生する期間を３日以上に設定したため、再生骨材に対して再生用添加剤及び／または施工性改善剤が旧アスファルト内部に深く浸透して高い柔軟性を確保できる。 Further, the step of curing the asphalt recycled aggregate is preferably performed for 3 days or more.
Since the period for adding the regeneration additive and / or the workability improver to the asphalt recycled aggregate and curing is set to 3 days or more, the regeneration additive and / or the workability improver for the recycled aggregate are old. High flexibility can be secured by deeply penetrating into the asphalt.

また、アスファルト再生骨材を養生した後で、アスファルト再生骨材を加熱することが好ましい。
アスファルト再生骨材に再生用添加剤及び／または施工性改善剤を添加して養生した後で加熱することで、アスファルト再生骨材を乾燥させることができる。 Further, it is preferable to heat the recycled asphalt aggregate after curing the recycled asphalt aggregate.
The asphalt recycled aggregate can be dried by adding a regeneration additive and / or a workability improver to the asphalt recycled aggregate and heating after curing.

また、再生用添加剤及び／または施工性改善剤は、アスファルト再生骨材に噴射することで添加することが好ましい。
再生用添加剤及び／または施工性改善剤をアスファルト再生骨材に噴射して添加するため、アスファルト再生骨材の表面に均一に被覆することができる。 Further, it is preferable that the regenerating additive and / or the workability improving agent are added by spraying the asphalt recycled aggregate.
Since the regenerating additive and / or the workability improving agent are added by spraying to the asphalt regenerated aggregate, the surface of the asphalt regenerated aggregate can be uniformly coated.

本発明による再生アスファルト混合物は、再生用添加剤及び／または施工性改善剤が添加されて養生したアスファルト再生骨材と新規の骨材及びアスファルトとが混合されてなる再生アスファルト混合物であって、アスファルト再生骨材はその表面から内部の旧アスファルト内に再生用添加剤及び／または施工性改善剤が浸透していることを特徴とする。
本発明によれば、常温下で、または加温して、アスファルト再生骨材に再生用添加剤及び／または施工性改善剤を添加して養生することで、再生用添加剤及び／または施工性改善剤が再生骨材の旧アスファルト内部まで浸透して柔軟性を回復することができるため、新規の骨材及び新規のアスファルトと共にミキサー等で混合して製造された再生アスファルト混合物は柔軟性を回復でき、アスファルト舗装の轍掘れと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。 The regenerated asphalt mixture according to the present invention is a regenerated asphalt mixture obtained by mixing a regenerated asphalt regenerated aggregate to which a regenerating additive and / or a workability improving agent is added and a new aggregate and asphalt. The recycled aggregate is characterized in that a regenerating additive and / or a workability improving agent permeates into the old asphalt inside from the surface thereof.
According to the present invention, a regeneration additive and / or workability is improved by adding a regeneration additive and / or a workability improver to asphalt recycled aggregate at room temperature or by heating, and curing. Since the improver can penetrate into the old asphalt of the recycled aggregate and restore flexibility, the recycled asphalt mixture produced by mixing with a new aggregate and new asphalt with a mixer etc. restores flexibility As a result, it is possible to improve the durability by suppressing rutting and cracking of asphalt pavement for a long period of time.

本発明に係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によれば、アスファルト再生骨材に常温で、または加温して、再生用添加剤及び／または施工性改善剤を添加して養生することで、再生骨材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と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 for producing a recycled asphalt mixture and the recycled asphalt mixture according to the present invention, curing the asphalt recycled aggregate at room temperature or by heating, adding a regeneration additive and / or a workability improving agent, and curing. Thus, the flexibility and durability of the recycled aggregate can be restored, so that the rut and cracking of the asphalt pavement are suppressed 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を示す模式図である。FIG. 1 is a schematic diagram showing an apparatus for producing a recycled asphalt mixture according to an embodiment of the present invention. 図１に示す再生アスファルト混合物の製造装置において、再生アスファルト混合物に再生用添加剤を噴射する状態を示す図である。FIG. 2 is a diagram showing a state in which a regeneration additive is injected into the recycled asphalt mixture in the apparatus for producing a recycled asphalt mixture shown in FIG. 1. 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）は実施形態による常温下で、または加温して、アスファルト再生骨材に再生用添加剤を添加した状態の図、（ｃ）は従来例による加熱状態でアスファルト再生骨材に再生用添加剤を添加した状態の図である。1 shows a diagram in which a regenerating additive is added to a regenerated aggregate, (a) is a diagram of an asphalt regenerated aggregate, and (b) is an asphalt regenerated aggregate at room temperature or by heating according to the embodiment. FIG. 3C is a diagram of a state where a regeneration additive is added to the asphalt recycled aggregate in a heated state according to a conventional example. アスファルト再生骨材に再生用添加剤を添加して養生した試験例と疲労破壊回数との関係を示すグラフである。It is a graph which shows the relationship between the test example which added the additive for reproduction | regeneration to asphalt reproduction | regeneration aggregate, and was cured, and the number of times of fatigue fracture.

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方法と再生アスファルト混合物について説明する。
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、新規なアスファルトｃを収容して加熱可能なアスファルト貯蔵サイロ２と、新規な粗骨材（石、砕石）ｂと細骨材(砂)ｄを加熱するための骨材加熱用ドライヤ３とを備えている。更に、この製造装置１は、アスファルト再生骨材ａに再生用添加剤と施工性改善剤のいずれか一方または両方を添加して養生した後、このアスファルト再生骨材ａを加熱するための再生骨材加熱用ドライヤ４と、を備えている。 Hereinafter, a method for producing a recycled asphalt mixture and a recycled asphalt mixture according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows an apparatus 1 for producing a recycled asphalt mixture A according to an embodiment of the present invention. The production apparatus 1 for the recycled asphalt mixture A is for heating the asphalt storage silo 2 that can accommodate and heat the new asphalt c, and the new coarse aggregate (stone, crushed stone) b and the fine aggregate (sand) d. And a dryer 3 for heating the aggregate. Further, the manufacturing apparatus 1 is configured to add one or both of the regeneration additive and the workability improving agent to the asphalt regenerated aggregate a and cure the same, and then regenerate the regenerated bone for heating the asphalt regenerated aggregate a. And a material heating dryer 4.

また、再生アスファルト混合物Ａの製造装置１は、アスファルト再生骨材ａと新規のアスファルトｃと粗骨材ｂ及び細骨材ｄとを投入して攪拌混合するミキサー５を備えている。ミキサー５内で攪拌混合さ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６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５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。
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。 The apparatus 1 for producing the recycled asphalt mixture A is provided with a mixer 5 for charging and mixing the asphalt recycled aggregate a, new asphalt c, coarse aggregate b and fine aggregate d. The regenerated asphalt mixture A stirred and mixed in the mixer 5 is dropped on, for example, a dump truck 6 and transported to a construction site for asphalt pavement. Alternatively, the reclaimed asphalt mixture A may be discharged directly from the mixer 5 on site to perform construction.
As the new asphalt c, for example, straight asphalt, blown asphalt, modified asphalt to which rubber, a polymer, or the like is added, and the like generally used for pavement can be used.

本実施形態で用いるアスファルト再生骨材ａ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オイル分が少なくなり、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という。アスファルト再生骨材ａには、骨材と骨材に付着した旧アスファルトを含んでいる。また、アスファルト再生骨材ａは、全質量に対して旧アスファルトｃ´が３．８質量％以上含まれることが好ましい。
しかも、この旧アスファルトｃ´の針入度（１/１０ｍｍ）は１０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、旧アスファルトの圧裂係数（ＭＰａ）は１．９０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。 The asphalt recycled aggregate a used in the present embodiment is obtained by crushing asphalt waste generated at the time of repairing or replacing existing asphalt pavement into an appropriate size. Asphalt c contains four components, namely, a saturated component, an aromatic component, a resin component, and asphaltene (carbon), and has a property that the oil content decreases and the asphaltene increases when the regeneration is repeated and old. This is called old asphalt. The asphalt recycled aggregate a includes the aggregate and the old asphalt attached to the aggregate. It is preferable that the asphalt recycled aggregate a contains 3.8% by mass or more of the old asphalt c ′ with respect to the total mass.
Moreover, it is preferable that the penetration (1/10 mm) of the old asphalt c 'is 10 or more. The penetration is an index indicating the hardness of the recovered asphalt, and is measured by a penetration test. Further, it is preferred that the old asphalt has a compression coefficient (MPa) of 1.90 or less. The rupture coefficient is an index indicating the viscoelasticity (toughness and softness) of the asphalt recycled aggregate, and is measured by a rupture coefficient test.

また、アスファルト再生骨材ａに添加する再生用添加剤は、旧アスファルトｃ´の柔軟性等の性状を回復させる効果のある添加剤であり、石油潤滑油系のものが挙げられ、例えばＲＤＥＸ、ＲＪ−１、ＲＪ−Ｔ等がある。再生用添加剤の成分は飽和分、芳香族分、レジン分を含んでいる。再生用添加剤の添加量はアスファルト再生骨材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。
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アスファルト再生骨材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。 The regenerating additive to be added to the asphalt regenerated aggregate a is an additive having an effect of restoring properties such as flexibility of the old asphalt c ′, and examples thereof include petroleum lubricating oil-based ones, for example, RDEX, RJ-1, RJ-T and the like. The components of the regenerating additive include a saturated component, an aromatic component, and a resin component. The amount of the additive for regeneration is preferably 0.1% by mass or more based on the total mass of the asphalt recycled aggregate a.
The workability improving agent is an additive that improves the workability of the recycled asphalt mixture A, and can specifically lower the viscosity of the recycled asphalt mixture A. For this reason, the leveling work of the recycled asphalt mixture A using a paving tool such as a scoop or a rake becomes easy. Examples of the workability improver include animal and vegetable oils and petroleum oils, such as fatty acid compounds and glycol ether compounds. The addition amount of the workability improving agent is preferably 0.02% by mass or more based on the total mass of the asphalt recycled aggregate a.
When both the regenerating additive and the workability improving agent are used, the amount of each additive is set according to the ratio.

次に、本実施形態による再生アスファルト混合物の製造方法について、図１乃至図３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ａを製造する。破砕されたアスファルト再生骨材ａの粒子は適宜の粒径、例えば粒径１３ｍｍ〜０ｍｍの範囲とし、分級しなくてもよい。アスファルト再生骨材ａは、例えば図３（ａ）に示す形状であり、粗骨材ｂや細骨材ｄ等からなる塊状の骨材ｅの表面に旧アスファルトｃ´と細骨材ｄが付着して適宜厚さの被膜の状態とされている。 Next, the method for producing a recycled asphalt mixture according to the present embodiment will be described with reference to FIGS.
First, as a pre-process, asphalt waste aggregate excavated at the time of repairing or replacing existing asphalt pavement is crushed into an appropriate size to produce asphalt recycled aggregate a. The particles of the crushed asphalt recycled aggregate a have an appropriate particle size, for example, in the range of 13 mm to 0 mm, and need not be classified. The asphalt recycled aggregate a has, for example, the shape shown in FIG. 3A, and the old asphalt c ′ and the fine aggregate d are attached to the surface of a massive aggregate e including the coarse aggregate b and the fine aggregate d. The thickness of the film is appropriately adjusted.

このアスファルト再生骨材ａを、図２に示すように、例えばベルトコンベア８で再生骨材貯蔵サイロ９に運搬する。しかも、ベルトコンベア８から再生骨材貯蔵サイロ９にアスファルト再生骨材ａを投下する際、噴射機１０によって常温下で、または加温して、再生用添加剤及び/または施工性改善剤をアスファルト再生骨材ａに噴霧する。なお、常温下で、または加温して、アスファルト再生骨材ａに再生用添加剤および／または施工性改善剤を添加するときの温度は、−１０℃〜１３０℃が好ましく、５℃〜１００℃がより好ましい。このときの温度は、再生骨材加熱用ドライヤ４やミキサー５での混合温度である１３０℃超〜１７０℃とすると、再生用添加剤および／または施工性改善剤を添加後の養生状態における含浸効果が得難いため、上限を１３０℃とした。
これら再生用添加剤及び/または施工性改善剤を添加したアスファルト再生骨材ａは再生骨材貯蔵サイロ９で養生される。アスファルト再生骨材ａの養生期間は、少なくとも３日とする。養生が３日より少ないと、再生用添加剤及び/または施工性改善剤の、骨材ｅの旧アスファルトｃ´への浸透が不十分であり性状を十分改善できない。ここで、再生骨材貯蔵サイロ９に代えて、再生骨材貯蔵ヤードを使用してもよい。 This asphalt recycled aggregate a is transported to a recycled aggregate storage silo 9 by, for example, a belt conveyor 8 as shown in FIG. Moreover, when the asphalt recycled aggregate a is dropped from the belt conveyor 8 to the recycled aggregate storage silo 9, the injection additive 10 is used at normal temperature or by heating, and the regeneration additive and / or the workability improving agent are asphalt. Spray on recycled aggregate a. The temperature at which the regeneration additive and / or the workability improving agent is added to the asphalt regenerated aggregate a at room temperature or by heating is preferably from -10 ° C to 130 ° C, and preferably from 5 ° C to 100 ° C. C is more preferred. When the temperature at this time is more than 130 ° C. to 170 ° C., which is the mixing temperature in the recycled aggregate heating dryer 4 and the mixer 5, the impregnation in the cured state after the addition of the regeneration additive and / or the workability improving agent is performed. Since the effect is difficult to obtain, the upper limit was set to 130 ° C.
The asphalt regenerated aggregate a to which the regenerating additive and / or the workability improving agent is added is cured in the regenerated aggregate storage silo 9. The curing period of the asphalt recycled aggregate a is at least three days. If the curing is less than 3 days, the regenerating additive and / or the workability improving agent will not sufficiently penetrate into the old asphalt c 'of the aggregate e and the properties cannot be sufficiently improved. Here, a recycled aggregate storage yard may be used instead of the recycled aggregate storage silo 9.

本実施形態では、常温下で、または加温して、アスファルト再生骨材ａの表面に再生用添加剤及び/または施工性改善剤を噴霧して３日以上養生させるため、図３（ｂ）に示すようにアスファルト再生骨材ａの表面に付着し被覆された再生用添加剤及び/または施工性改善剤が旧アスファルトｃ´内部に浸透して油分が多くなり軟らかくなる。この場合、再生用添加剤及び/または施工性改善剤はアスファルト再生骨材ａの骨材ｅ内まで浸透する必要はないが、表面から旧アスファルトｃ´内部の深い所まで(好ましくは骨材ｅの表面まで)均一に混ざり合うため、アスファルト混合物Ａの品質が向上する。
これに対し、図３（ｃ）に示す従来のアスファルト再生骨材ａは、加熱した状態で再生用添加剤及び/または施工性改善剤を噴霧するため、骨材ｅと旧アスファルトｃ´及び細骨材ｄが熱で固くなり、再生用添加剤及び/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ｃ´の内部には十分浸透しない。そのため、アスファルト再生骨材ａの性状は十分回復しない。 In this embodiment, since the additive for regeneration and / or the workability improving agent is sprayed on the surface of the asphalt recycled aggregate a at normal temperature or by heating, and cured for 3 days or more, FIG. As shown in (2), the regenerating additive and / or the workability improving agent attached and coated on the surface of the asphalt regenerated aggregate a penetrates into the old asphalt c ′, and the oil content increases and the softness becomes soft. In this case, the regenerating additive and / or the workability improving agent need not penetrate into the aggregate e of the asphalt recycled aggregate a, but from the surface to a deep portion inside the old asphalt c ′ (preferably the aggregate e). ), The quality of the asphalt mixture A is improved.
On the other hand, the conventional asphalt regenerated aggregate a shown in FIG. 3 (c) sprays the regenerating additive and / or the workability improving agent in a heated state. The aggregate d is hardened by heat, and the regenerating additive and / or the workability improving agent adhere to the surface to form a film, and do not sufficiently penetrate into the old asphalt c ′. Therefore, the properties of the asphalt recycled aggregate a are not sufficiently recovered.

そして、本工程として、養生を終えたアスファルト再生骨材ａは再生骨材加熱用ドライヤ４で加熱して乾燥させる。また、新規の細骨材ｄ及び粗骨材ｂ等からなる骨材ｅは骨材加熱用ドライヤ３で加熱して乾燥させ、新規のアスファルトｃもアスファルト貯蔵サイロ２内で加熱して乾燥させる。
図１に示す再生アスファルト混合物Ａの製造装置１において、乾燥を終えたアスファルト再生骨材ａはミキサー５に投入する。また、新規の細骨材ｄ及び粗骨材ｂとアスファルトｃとフィラーもミキサー５に投入して攪拌羽根で攪拌混合して、再生アスファルト混合物Ａを製造する。 Then, in this step, the cured asphalt regenerated aggregate a is heated and dried by the regenerated aggregate heating dryer 4. The aggregate e including the new fine aggregate d and the coarse aggregate b is heated and dried by the aggregate heating dryer 3, and the new asphalt c is also heated and dried in the asphalt storage silo 2.
In the manufacturing apparatus 1 for the recycled asphalt mixture A shown in FIG. 1, the dried asphalt recycled aggregate a is put into the mixer 5. In addition, the new fine aggregate d, the coarse aggregate b, the asphalt c, and the filler are also charged into the mixer 5 and stirred and mixed by the stirring blade to produce a regenerated asphalt mixture A.

新規の骨材として、細骨材ｄと粗骨材ｂ以外に、スラグや再生骨材等を含んでいてもよい。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ものを採用することができる。
新規のアスファルトｃは、ストレートアスファルトやブローンアスファルト、ゴムやポリマー等を添加した改質アスファルト等、一般的に舗装に用いられるものが好ましい。加熱したアスファルトｃに水蒸気や水、特殊添加剤等を添加することで、アスファルトｃを発泡させてもよい。アスファルトｃを発泡させることでアスファルトｃの体積が膨張して粘性が低下するため、通常より低い温度でフォームドアスファルト舗装の施工が可能になる。
また、再生アスファルト混合物Ａの材料としてゴムチップを添加してもよい。 As a new aggregate, slag, recycled aggregate, and the like may be included in addition to the fine aggregate d and the coarse aggregate b. As the filler, for example, one generally used for asphalt pavement, such as stone powder, can be employed.
As the new asphalt c, those generally used for pavement, such as straight asphalt, blown asphalt, and modified asphalt to which rubber or a polymer is added, are preferable. The asphalt c may be foamed by adding steam, water, special additives and the like to the heated asphalt c. By foaming the asphalt c, the volume of the asphalt c expands and the viscosity decreases, so that the construction of the foam door asphalt pavement can be performed at a lower temperature than usual.
Further, rubber chips may be added as a material of the recycled asphalt mixture A.

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の製造方法及び再生アスファルト混合物Ａは、アスファルト再生骨材ａに常温で、または加温して、再生用添加剤及び/または施工性改善剤を噴霧等で添加した後、３日以上養生する。そのため、アスファルト再生骨材ａの表面に付着した旧アスファルトｃ´に再生用添加剤及び/または施工性改善剤が浸透し、従来のものよりアスファルト再生骨材ａの柔軟性と耐久性を回復できるため、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。   As described above, the method for producing the recycled asphalt mixture A according to the present embodiment and the recycled asphalt mixture A are performed at normal temperature or by heating the asphalt recycled aggregate a, and the regeneration additive and / or the workability improving agent are added. After adding by spraying etc., cure for 3 days or more. Therefore, the regenerating additive and / or the workability improving agent penetrates into the old asphalt c ′ attached to the surface of the asphalt recycled aggregate a, and the flexibility and durability of the asphalt recycled aggregate a can be recovered as compared with the conventional one. Therefore, a highly durable mixture in which pavement is not easily pitted or cracked can be obtained.

次に本発明の実施形態による再生アスファルト混合物Ａの実施例について説明する。
アスファルト再生骨材ａのサンプルとして、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切なサイズに破砕したものを４種類製作し、試験例１，２，３，４とした。これら試験例１，２，３，４に再生用添加剤をそれぞれ添加するものとした。
再生用添加剤の添加量は旧アスファルトｃ´の劣化の程度により、再生骨材ａの全質量に対して０．２９質量％とした。また、製造された再生アスファルト混合物Ａの配合割合は、再生用添加剤を含む再生骨材ａが４９．５質量％、新規骨材ｅが４７．３質量％、新規アスファルトｃが３．２質量％とした。 Next, examples of the recycled asphalt mixture A according to the embodiment of the present invention will be described.
As samples of asphalt recycled aggregate a, four types of asphalt waste crushed to an appropriate size were produced at the time of repairing or replacing existing asphalt pavement, and four types were produced. did. Regeneration additives were added to Test Examples 1, 2, 3, and 4, respectively.
The amount of the regenerating additive was set to 0.29% by mass based on the total mass of the regenerated aggregate a depending on the degree of deterioration of the old asphalt c '. The blending ratio of the produced recycled asphalt mixture A was 49.5% by mass for the recycled aggregate a containing the additive for regeneration, 47.3% by mass for the new aggregate e, and 3.2% for the new asphalt c. %.

試験例１は、アスファルト再生骨材ａを加熱した後に０．２９質量％の再生用添加剤を添加し、２時間養生した。試験例１の再生骨材ａは従来から用いられている通常品である。
試験例２は、常温のアスファルト再生骨材ａに０．２９質量％の再生用添加剤を添加し、１日養生した。
試験例３は、常温のアスファルト再生骨材ａに０．２９質量％の再生用添加剤を添加し、３日養生した。
試験例４は、常温のアスファルト再生骨材ａに０．２９質量％の再生用添加剤を添加し、７日養生した。 In Test Example 1, 0.29% by mass of a regenerating additive was added after heating the asphalt regenerated aggregate a, and the mixture was cured for 2 hours. The recycled aggregate a in Test Example 1 is a conventional product that has been conventionally used.
In Test Example 2, 0.29% by mass of a regenerating additive was added to asphalt regenerated aggregate a at room temperature, and the mixture was cured for one day.
In Test Example 3, 0.29% by mass of a regenerating additive was added to asphalt-regenerated aggregate a at room temperature, and the mixture was cured for 3 days.
In Test Example 4, 0.29% by mass of a regenerating additive was added to asphalt-regenerated aggregate a at room temperature and cured for 7 days.

試験例１はアスファルト再生骨材ａを加熱した後に養生した。試験例２，３，４は、養生後に所定の温度(例えば１６０℃)まで加熱した。各試験例１，２，３，４は、加熱した骨材及び新規アスファルトと共にミキサー５内でそれぞれ混合して再生アスファルト混合物Ａの供試体１，２，３，４を製作した。
放冷後の各供試体１，２，３，４を試験用に成型し、それぞれ各養生槽内で5℃に冷却した。
各供試体１，２，３，４について、舗装調査・試験法便覧Ｂ０１８Ｔ「アスファルト混合物の曲げ疲労試験方法」に準拠して試験を実施した。試験条件は、繰り返し載荷の振幅を３００μm、周波数を１０Ｈｚとした。 In Test Example 1, the asphalt-regenerated aggregate a was cured after being heated. Test Examples 2, 3, and 4 were heated to a predetermined temperature (for example, 160 ° C.) after curing. Each of Test Examples 1, 2, 3, and 4 was mixed with the heated aggregate and the new asphalt in the mixer 5 to produce specimens 1, 2, 3, and 4 of the regenerated asphalt mixture A.
The specimens 1, 2, 3, and 4 after cooling were molded for testing, and each was cooled to 5 ° C. in each curing tank.
For each of the specimens 1, 2, 3, and 4, a test was conducted in accordance with the pavement survey and test method handbook B018T “Bending fatigue test method for asphalt mixture”. The test conditions were such that the amplitude of the repeated loading was 300 μm and the frequency was 10 Hz.

試験結果から、各試験例（供試体）１，２，３，４の疲労破壊回数結果は図４のグラフに示す結果が得られた。試験例１、２では、ひび割れを起こす疲労破壊回数は１７７００回、１９１００回であった。一方、養生期間が３日、７日となる試験例３、４では疲労破壊回数は２２９００回、２３６００回となり、試験例１，２よりひび割れや轍掘れを起こしにくい再生アスファルト混合物Ａが得られたことが確認できた。
そのため、上述した試験結果から、アスファルト再生骨材ａに常温で再生用添加剤を添加して３日以上養生することで、従来のものよりも耐久性の高い高品質な再生アスファルト混合物Ａが得られた。 From the test results, the results shown in the graph of FIG. 4 were obtained as the results of the number of fatigue failures of each of the test examples (specimens) 1, 2, 3, and 4. In Test Examples 1 and 2, the number of fatigue fractures causing cracks was 17,700 and 19,100. On the other hand, in Test Examples 3 and 4 in which the curing period was 3 days and 7 days, the number of fatigue failures was 22,900 and 23,600, and a regenerated asphalt mixture A less prone to cracking and rutting was obtained than in Test Examples 1 and 2. That was confirmed.
Therefore, from the test results described above, a high-quality regenerated asphalt mixture A having higher durability than the conventional one can be obtained by adding a regenerating additive to the asphalt regenerated aggregate a at room temperature and curing it for three days or more. Was done.

なお、本発明による再生アスファルト混合物Ａとその製造方法は、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 recycled asphalt mixture A and the method for producing the same according to the present invention are not limited to the above-described embodiment, and may appropriately replace or change the configuration of the above-described embodiment without departing from the gist of the present invention. be able to. Hereinafter, a modified example of the recycled asphalt mixture A according to the present embodiment and the method for producing the same will be described. Components that are the same as or similar to the above-described embodiment will be described using the same reference numerals.

上述した実施形態では、アスファルト再生骨材ａについて分級することなく、例えば１３ｍｍ〜０ｍｍの粒径物を混ぜ合わせたものに再生用添加剤を添加したが、再生用添加剤に代えて施工性改善剤を添加してもよいし、両方を添加してもよい。また、アスファルト再生骨材ａを例えば１３ｍｍ〜２ｍｍと２ｍｍ〜０ｍｍに分級して、いずれかの分級物に再生用添加剤及び/または施工性改善剤を添加してもよい。
また、アスファルト再生骨材ａに対する再生用添加剤及び/または施工性改善剤の添加に際し、実施形態ではベルトコンベア８から再生骨材貯蔵サイロ９に投下する際に、噴射機１０で噴霧するようにしたが、添加の方法は適宜の手法を採用できる。 In the above-described embodiment, the asphalt-regenerated aggregate a was not classified, and the regeneration additive was added to a mixture of, for example, 13 mm to 0 mm in particle size. However, the workability was improved in place of the regeneration additive. An agent may be added, or both may be added. Further, the asphalt recycled aggregate a may be classified into, for example, 13 mm to 2 mm and 2 mm to 0 mm, and a regenerating additive and / or a workability improving agent may be added to any of the classified materials.
In addition, in the case of adding the regenerating additive and / or the workability improving agent to the asphalt regenerated aggregate a, in the embodiment, when the additive is dropped from the belt conveyor 8 to the regenerated aggregate storage silo 9, it is sprayed by the injector 10. However, an appropriate method can be adopted as a method of addition.

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 骨材加熱用ドライヤ
４ 再生骨材加熱用ドライヤ
５ ミキサー
６ ダンプトラック
９ 再生骨材貯蔵サイロ
１０ 噴射機
ａ 再生骨材
Ａ 再生アスファルト混合物
ｂ 粗骨材
ｃ アスファルト
ｃ´ 旧アスファルト
ｄ 細骨材 DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus of recycled asphalt mixture 2 Asphalt storage silo 3 Dryer for heating aggregate 4 Dryer for heating recycled aggregate 5 Mixer 6 Dump truck 9 Recycled aggregate storage silo 10 Injector a Recycled aggregate A Recycled asphalt mixture b Coarse aggregate c Asphalt c 'Old asphalt d Fine aggregate

Claims (5)

常温下で、または加温して、アスファルト再生骨材に再生用添加剤及び／または施工性改善剤を添加する工程と、
前記アスファルト再生骨材を養生する工程と、
養生後の前記アスファルト再生骨材と新規の骨材及び新規のアスファルトを混合する工程と、
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方法。 A step of adding an additive for regeneration and / or a workability improving agent to the asphalt recycled aggregate at normal temperature or by heating,
Curing the asphalt recycled aggregate,
Mixing the asphalt recycled aggregate with the new aggregate and new asphalt after curing,
A method for producing a recycled asphalt mixture, comprising: 前記アスファルト再生骨材を養生する工程は３日以上とした請求項１に記載された再生アスファルト混合物の製造方法。   The method for producing a recycled asphalt mixture according to claim 1, wherein the step of curing the asphalt recycled aggregate is performed for 3 days or more. 前記アスファルト再生骨材を養生した後で、前記アスファルト再生骨材を加熱するようにした請求項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 2, wherein the asphalt recycled aggregate is heated after curing the asphalt recycled aggregate. 前記再生用添加剤及び／または前記施工性改善剤は、前記アスファルト再生骨材に噴射することで添加する請求項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 regeneration additive and / or the workability improving agent are added by spraying the asphalt recycled aggregate. 再生用添加剤及び／または施工性改善剤が添加されて養生されたアスファルト再生骨材と新規の骨材及び新規のアスファルトとが混合されてなる再生アスファルト混合物であって、
前記アスファルト再生骨材はその表面から内部の旧アスファルト内に前記再生用添加剤及び／または施工性改善剤が浸透していることを特徴とする再生アスファルト混合物。 A regenerated asphalt mixture obtained by mixing a regenerated asphalt regenerated aggregate to which a regenerating additive and / or a workability improving agent has been added and a new aggregate and a new asphalt,
A recycled asphalt mixture, wherein the asphalt recycled aggregate has the regenerating additive and / or the workability improving agent permeating into the old asphalt inside from the surface thereof.
JP2018164924A 2018-09-03 2018-09-03 Method for producing recycled asphalt mixture and recycled asphalt mixture Active JP7163113B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2018164924A JP7163113B2 (en) 2018-09-03 2018-09-03 Method for producing recycled asphalt mixture and recycled asphalt mixture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2018164924A JP7163113B2 (en) 2018-09-03 2018-09-03 Method for producing recycled asphalt mixture and recycled asphalt mixture

Publications (2)

Publication Number Publication Date
JP2020037798A true JP2020037798A (en) 2020-03-12
JP7163113B2 JP7163113B2 (en) 2022-10-31

Family

ID=69737636

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2018164924A Active JP7163113B2 (en) 2018-09-03 2018-09-03 Method for producing recycled asphalt mixture and recycled asphalt mixture

Country Status (1)

Country Link
JP (1) JP7163113B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021199255A1 (en) * 2020-03-31 2021-10-07 平田機工株式会社 Asphalt mix regeneration method
WO2021232859A1 (en) * 2020-05-22 2021-11-25 福建省铁拓机械股份有限公司 Continuous recycled asphalt mixture production device
WO2021248925A1 (en) * 2020-06-12 2021-12-16 福建省铁拓机械股份有限公司 High-reference hot mix plant recycling device
CN114150550A (en) * 2021-12-21 2022-03-08 徐州市通途装配式建筑科技有限公司 Waste asphalt regeneration equipment
KR102476914B1 (en) * 2021-12-23 2022-12-13 인성에이앤티 주식회사 Manufacturing apparatus for recycled ascon

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5421419A (en) * 1977-07-18 1979-02-17 Okumuragumi Doboku Kougiyou Kk Room temperature regeneration of asphalt mixture waste material
JPS5796106A (en) * 1980-12-08 1982-06-15 Tokyo Koki Kk Asphalt plant
JPS59206504A (en) * 1983-05-06 1984-11-22 日工株式会社 Regeneration of waste asphalt paving material
JPS60144606U (en) * 1984-03-02 1985-09-25 株式会社新潟鐵工所 asphalt plant
JPS6195102A (en) * 1984-10-15 1986-05-13 株式会社新潟鐵工所 Apparatus for regenerating asphalt mixture
JPS6189004U (en) * 1984-11-12 1986-06-10
JPS62258003A (en) * 1986-05-01 1987-11-10 大成ロテック株式会社 Method and apparatus for producing regenerated composite material
US4802139A (en) * 1987-08-21 1989-01-31 Taisei Road Construction Co., Ltd. Apparatus for producing a heated reproduction asphalt mixture
JPH0261208A (en) * 1988-08-26 1990-03-01 Nikko Co Ltd Manufacture of asphalt paving mixture
JPH11310708A (en) * 1998-04-28 1999-11-09 Noritsu Gijutsu Kenkyusho:Kk Cold-laid asphalt paving mixture
JP2006036962A (en) * 2004-07-28 2006-02-09 Clay Baan Gijutsu Kenkyusho:Kk Preparation process for heated asphalt mixture
JP2010100996A (en) * 2008-10-21 2010-05-06 Nikko Co Ltd Method of manufacturing recycled asphalt mixture

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5421419A (en) * 1977-07-18 1979-02-17 Okumuragumi Doboku Kougiyou Kk Room temperature regeneration of asphalt mixture waste material
JPS5796106A (en) * 1980-12-08 1982-06-15 Tokyo Koki Kk Asphalt plant
JPS59206504A (en) * 1983-05-06 1984-11-22 日工株式会社 Regeneration of waste asphalt paving material
JPS60144606U (en) * 1984-03-02 1985-09-25 株式会社新潟鐵工所 asphalt plant
JPS6195102A (en) * 1984-10-15 1986-05-13 株式会社新潟鐵工所 Apparatus for regenerating asphalt mixture
JPS6189004U (en) * 1984-11-12 1986-06-10
JPS62258003A (en) * 1986-05-01 1987-11-10 大成ロテック株式会社 Method and apparatus for producing regenerated composite material
US4802139A (en) * 1987-08-21 1989-01-31 Taisei Road Construction Co., Ltd. Apparatus for producing a heated reproduction asphalt mixture
JPH0261208A (en) * 1988-08-26 1990-03-01 Nikko Co Ltd Manufacture of asphalt paving mixture
JPH11310708A (en) * 1998-04-28 1999-11-09 Noritsu Gijutsu Kenkyusho:Kk Cold-laid asphalt paving mixture
JP2006036962A (en) * 2004-07-28 2006-02-09 Clay Baan Gijutsu Kenkyusho:Kk Preparation process for heated asphalt mixture
JP2010100996A (en) * 2008-10-21 2010-05-06 Nikko Co Ltd Method of manufacturing recycled asphalt mixture

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021199255A1 (en) * 2020-03-31 2021-10-07 平田機工株式会社 Asphalt mix regeneration method
JP7420924B2 (en) 2020-03-31 2024-01-23 平田機工株式会社 Method for producing recycled asphalt mixture and method for analyzing waste material of asphalt mixture
JP7443611B2 (en) 2020-03-31 2024-03-05 平田機工株式会社 Manufacturing method and testing unit for recycled asphalt mixture
WO2021232859A1 (en) * 2020-05-22 2021-11-25 福建省铁拓机械股份有限公司 Continuous recycled asphalt mixture production device
WO2021248925A1 (en) * 2020-06-12 2021-12-16 福建省铁拓机械股份有限公司 High-reference hot mix plant recycling device
CN114150550A (en) * 2021-12-21 2022-03-08 徐州市通途装配式建筑科技有限公司 Waste asphalt regeneration equipment
KR102476914B1 (en) * 2021-12-23 2022-12-13 인성에이앤티 주식회사 Manufacturing apparatus for recycled ascon

Also Published As

Publication number Publication date
JP7163113B2 (en) 2022-10-31

Similar Documents

Publication Publication Date Title
JP2020037798A (en) Recycled asphalt mixture manufacturing method and recycled asphalt mixture
RU2468049C2 (en) Asphalt modifiers for use in "warm mixtures" containing adhesion promoter
US20170370899A1 (en) Methods for Evaluating Asphalt Mix Compositions Containing Reclaimed Asphalt
CN106046810B (en) Pitch binder and bituminous concrete performance are improved using heavy oil flying dust
JP5681117B2 (en) Method for activating bitumen-containing compositions
KR101849311B1 (en) Asphalt mixtures and pavement construction method using the same thing
JPWO2019003645A1 (en) Evaluation method of sample for evaluation of recycled asphalt, and manufacturing method of recycled asphalt mixture
Akisetty Evaluation of warm asphalt additives on performance properties of CRM binders and mixtures
WO2014168477A1 (en) Mastic composition for asphalt mixtures and process for making such a mastic composition
JP5160595B2 (en) Asphalt mixture for thin layer pavement and method for repairing pavement surface using the same
Azahar et al. Mechanical performance of asphalt mixture containing cup lump rubber
JP2017218761A (en) Asphalt pavement material for normal-temperature pavement
CN108676372B (en) Modified asphalt for waterproof sealing layer of high-speed railway and preparation method thereof
NL2012307C2 (en) Asphalt composition and process for preparing such a composition.
JP7460342B2 (en) Manufacturing method and device for manufacturing recycled asphalt mixture
JP5965066B2 (en) Method for producing regeneratively heated asphalt mixture
KR102504820B1 (en) Method for manufacturing asphalt composition suitable for using waste-ascon and slag aggregate
JP6433775B2 (en) Goose asphalt composition
Kar et al. Impact of binder on properties of foamed bituminous mixtures
RU2504523C1 (en) Dense vibro cast asphalt-concrete mixture
KR100640029B1 (en) Recycled superior hot mix asphalt for paving road
Saadeh et al. Performance Testing of Hot Mix Asphalt Modified with Recycled Waste Plastic
JP7146808B2 (en) goose asphalt 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
Glazachev et al. Complementary improvement of technological characteristics of asphalt concrete road surfaces using macromolecular nanocomposites

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20210614

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20220324

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20220405

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20220606

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: 20221011

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20221019

R150 Certificate of patent or registration of utility model

Ref document number: 7163113

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150