JP3805000B2 - Recycled asphalt additive - Google Patents
Recycled asphalt additive Download PDFInfo
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- JP3805000B2 JP3805000B2 JP13936995A JP13936995A JP3805000B2 JP 3805000 B2 JP3805000 B2 JP 3805000B2 JP 13936995 A JP13936995 A JP 13936995A JP 13936995 A JP13936995 A JP 13936995A JP 3805000 B2 JP3805000 B2 JP 3805000B2
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- asphalt
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Description
【０００１】
【産業上の利用分野】
本発明は、再生アスファルト用添加剤に関し、特にはアスファルト舗装廃材再生用添加剤に関する。さらに詳しくは、従来のものに比べ、アスファルト舗装廃材の繰り返し再生能力に優れ、アスファルト舗装廃材の廃棄用地不足や環境破壊などの問題を改善しうると共に、省資源化が図れるアスファルト舗装廃材再生用添加剤に関するものである。
【０００２】
【従来の技術】
従来、アスファルト舗装材は、産業廃棄物として処分されてきたが、近年、廃棄用地不足や環境破壊などの問題、及び省資源などの観点から、その再生利用が試みられてきた。さらに最近では、アスファルト舗装廃材を再生してアスファルト舗装に使用した後、あるいは工事などでアスファルト舗装廃材になったものについても再々生して使用できること、すなわち、アスファルト舗装廃材の繰り返し再生が要求されつつある。
このアスファルト舗装廃材中のアスファルト分はかなり劣化が進行しており、これを再生して再利用するには、通常、まずアスファルト舗装廃材を機械粉砕又は熱解砕により破砕し、次いでこれに再生用添加剤を混合して加熱軟化処理するか、あるいは、該破砕物を加熱軟化処理したのち、これに再生用添加剤を混合することにより、加熱再生アスファルト混合物を調製し、施工するといった方法が用いられている。この際用いられる再生用添加剤は、アスファルト舗装廃材中のアスファルトの針入度，伸度及びその他の性状を回復するために添加されるものである。
【０００３】
ところで、アスファルトはコロイド系であって、その分散相がアスファルテン、連続相がマルテンであるといわれており、そして、マルテンはさらに飽和分，芳香族分，レジン分よりなっているといわれている。アスファルトの劣化とは、酸化などの化学変化によりアスファルトの組成が変化し（飽和分→芳香族分→レジン分→アスファルテンと分子量が大きくなる方向に変化）、コロイド系の状態が変化することである。
従来、再生用添加剤の開発は、コンステンシー（硬さ）を元のレベルに戻すだけでなく、組成的に不足分を補ってオリジナルに近い組成に戻す考え方で進められてきた。特に芳香族分の補給が効果があると考えられ、芳香族化合物を高濃度に含有する添加剤、例えば高芳香族系鉱油や動植物油系添加剤などが再生用添加剤として市場に提供されてきた。
しかしながら、これらの添加剤を使用した場合のアスファルト舗装廃材の繰り返し再生性については、これまで、あまり報告されていないのが実状である。例えば、針入度２１〜２５程度の劣化アスファルトを用いて再生（再生用添加剤の添加）と加熱劣化を繰り返した試験において、４サイクル以上にわたり、針入度と共に、伸度及び軟化点を充分に元のレベルに戻すことのできる添加剤は、鉱油１００％のものについては皆無である。なお、再生アスファルトは一般にひび割れが生じる懸念があるため、このひび割れ発生の指標となる伸度の回復が重要である。
【０００４】
【発明が解決しようとする課題】
本発明は、このような状況下で、従来のものに比べ、使用済みアスファルト、特にアスファルト舗装廃材の繰り返し再生能力に優れ、アスファルト舗装廃材の廃棄用地不足や環境破壊などの問題を改善しうると共に、省資源化が可能なアスファルト舗装廃材等の再生用添加剤を提供することを目的とするものである。
【０００５】
【課題を解決するための手段】
本発明者らは、前記目的を達成するために鋭意研究を重ねた結果、動粘度及びアニリン点が特定の範囲にあるエキストラクト油が、アスファルト舗装廃材の繰り返し再生能力に優れていること、そしてこのものをアスファルト舗装廃材に特定の割合で配合することにより、舗装材として充分に使用可能な再生アスファルト舗装材が得られることを見出した。本発明は、かかる知見に基づいて完成したものである。
すなわち、本発明は、石油精製の溶剤抽出工程から得られるエキストラクト油であって、温度４０℃における動粘度が６００〜２０００ｍｍ2 ／ｓｅｃであり、かつアニリン点が３５℃以下であることを特徴とする再生アスファルト用添加剤、特にアスファルト舗装廃材再生用添加剤を提供するものである。
【０００６】
本発明の添加剤は、各種用途に供されたアスファルトの再生に適用されるが、特にアスファルト舗装廃材に好適に適用される。ここでアスファルト舗装廃材については各種のものが挙げられるが、各種工事の際に発生するアスファルト舗装廃材、例えば地下鉄工事，地下配管工事，道路舗装工事などの際に発生するアスファルト舗装廃材を挙げることができる。このアスファルト舗装廃材としては、そのアスファルトが針入度２０以上、とりわけ２５以上のものが、再生しやすいので好適である。なお、針入度はＪＩＳ Ｋ−２２０７に準じ、２５℃にて求めた値である（単位：１／１０ｍｍ）。
【０００７】
本発明の添加剤は、石油精製の溶剤抽出工程から得られるエキストラクト油からなり、かつ温度４０℃における動粘度が６００〜２０００ｍｍ2 ／ｓｅｃの範囲にあって、アニリン点が３５℃以下であることが必要である。この動粘度が６００ｍｍ2 ／ｓｅｃ未満では繰り返し再生性が不充分であり、２０００ｍｍ2 ／ｓｅｃを超えると再生プラントにおけるハンドリングが煩雑になる。繰り返し再生性及びハンドリングなどの面から、温度４０℃における好ましい動粘度は９００〜１６００ｍｍ2 ／ｓｅｃの範囲である。また、アニリン点が３５℃を超えると繰り返し再生性が不充分となる。繰り返し再生性を良好なものにするには、アニリン点は特に１０℃以下が好ましい。なお、動粘度及びアニリン点は、それぞれＪＩＳ Ｋ−２２８３及びＪＩＳ Ｋ−２２５６に準拠して求めた値である。さらに上記エキストラクト油は、粘度指数が−６０以下、特に−１００以下のものが繰り返し再生性の面で好ましい。
【０００８】
このような性状を有するエキストラクト油としては、ナフテン系油精製時に溶剤抽出されるエキストラクト油がある。このナフテン系油精製時に溶剤抽出されるエキストラクト油は、パラフィン系油などの精製時に溶剤抽出されるエキストラクト油に比べて、同様な組成（飽和分、芳香族分、レジン分）を有していてもアニリン点が低く、化学構造がかなり異なるものと推定される。アニリン点が低いエキストラクト油は繰り返し再生性が良好であり、したがって、ナフテン系油精製時に溶剤抽出されるエキストラクト油であることが必須である。
このような性状を有する本発明のアスファルト舗装廃材再生用添加剤は、従来のものに比べ、アスファルト舗装廃材の繰り返し再生能力に優れている。
【０００９】
次に、本発明の添加剤を用いてアスファルト舗装廃材を再生するにあたって、その添加剤の配合量については、該廃材中のアスファルトの針入度及び伸度などを所望の値にまで回復させるのに必要な量であり、廃材中のアスファルト分の重量に対して、１〜３０重量％の範囲で選定すべきである。この配合量が１重量％未満では、再生アスファルト舗装材中のアスファルトの針入度及び伸度などが所望の値にまで回復せず、再生効果が不充分であって、舗装した場合に舗装面にひび割れが発生するなどの問題が生じるおそれがある。また、３０重量％を超えると再生効果が過剰となり、特に針入度が所望の値を超え、耐流動性能が低下する傾向がみられる。適切な再生効果及び耐流動性能などの面から、特に好ましい配合量は３〜１７重量％の範囲である。
【００１０】
【実施例】
次に、本発明を実施例によりさらに詳しく説明するが、本発明は、これらの例によってなんら限定されるものではない。
実施例１，２、参考例１及び比較例１〜３
新ストレートアスファルト６０〜８０を、２００℃の乾燥機で強制劣化させ、針入度２５の劣化アスファルトを作製した。針入度はＪＩＳ Ｋ−２２０７に準じ、２５℃にて求めた値である（単位１／１０ｍｍ）。
次に、この劣化アスファルトを用い、再生（第１表に示す性状の添加剤を配合）と加熱劣化（薄膜加熱試験，ＪＩＳ Ｋ−２２０７）を繰り返し、伸度合格再生回数〔伸度（１５℃）１００ｃｍ以上の再生回数〕，軟化点合格再生回数（軟化点４4.０〜５2.０℃の再生回数）及び再生時配合量（伸度合格時）を求めた。強制劣化後のアスファルトの再生は、添加剤を目標針入度７０±２になるように添加して行った。なお伸度（１５℃，単位ｃｍ）及び軟化点の基準はＪＩＳ Ｋ−２２０７のストレートアスファルト６０〜８０に基づく。
【００１１】
また、劣化アスファルトの針入度回復に必要な添加剤の配合量を、１回目の再生時における目標針入度７０±２及び９０±２の場合について求めた。
これらの結果を第２表に示す。
なお、上記試験方法は、「第１９回日本道路会議論文集」第３９０ページ（平成３年）、及び「第２０回日本道路会議論文集」第４４４ページ（平成５年）記載の方法に準拠して行った。
また、劣化アスファルトとして針入度２５のものを使用したのは、次に示す理由による。
すなわち、再生アスファルト舗装材に用いるアスファルト舗装廃材中の劣化アスファルトの２５℃における針入度が２０以上と規定されており〔（社）日本道路協会，「プラント再生舗装技術指針」（平成４年１２月）〕、針入度２５の劣化アスファルトは最悪条件をシュミレートして採用したものである。
【００１２】
【表１】
【表２】
（注）
動粘度： ＪＩＳ Ｋ−２２８３
粘度指数： ＪＩＳ Ｋ−２２８３
アニリン点： ＪＩＳ Ｋ−２２５６
密度： ＪＩＳ Ｋ−２２４９
引火点： ＪＩＳ Ｋ−２２６５
（クリープランド式）
流動点： ＪＩＳ Ｋ−２２６９
カラムクロマト分析： ＪＰＩ−５Ｓ−２２−８３
【００１５】
【表３】
【表４】
第２表から分かるように、再生アスファルトで伸度の要求の厳しいアスファルト６０〜８０においても再生回数を大幅に向上させることができる。
【００１８】
【発明の効果】
本発明のアスファルト舗装廃材再生用添加剤は、従来のものに比べ、アスファルト舗装廃材の繰り返し再生能力に優れている。したがって、この再生用添加剤を用いることにより、アスファルト舗装廃材の廃棄用地不足や環境破壊などの問題を改善しうると共に、省資源化を図ることができる。
また、本発明のアスファルト舗装廃材再生用添加剤を用いた再生アスファルト舗装材は、舗装面にひび割れが発生するなどの問題もなく、各種舗装工事に好適に用いられる。[0001]
[Industrial application fields]
The present invention relates to an additive for recycled asphalt, and more particularly to an additive for recycling asphalt pavement waste material. In more detail, asphalt pavement waste recycle additive is superior to conventional ones in its ability to recycle asphalt pavement waste repeatedly, which can improve problems such as shortage of waste asphalt pavement waste and environmental damage, and save resources. It relates to the agent.
[0002]
[Prior art]
Conventionally, asphalt pavement materials have been disposed of as industrial waste. However, in recent years, recycling has been attempted in view of problems such as a shortage of land for disposal and environmental destruction, and resource saving. More recently, after asphalt pavement waste has been regenerated and used for asphalt pavement, it can also be regenerated and used after it has become asphalt pavement waste. is there.
The asphalt content in this asphalt pavement waste has deteriorated considerably, and in order to recycle and reuse it, usually the asphalt pavement waste is first crushed by mechanical crushing or thermal crushing, and then recycled. A method is used in which an additive is mixed and heat-softened, or the crushed material is heat-softened, and then a heat-regenerated asphalt mixture is prepared and applied by mixing a regenerative additive. It has been. The regeneration additive used at this time is added to recover the penetration, elongation and other properties of asphalt in the asphalt pavement waste.
[0003]
By the way, it is said that asphalt is a colloidal system, its dispersed phase is asphaltene, and the continuous phase is marten, and it is said that the marten is further composed of a saturated component, an aromatic component, and a resin component. Degradation of asphalt means that the composition of asphalt changes due to chemical changes such as oxidation (saturation → aromatics → resin → changes in the direction of increasing molecular weight with asphaltene), and the state of the colloidal system changes. .
Conventionally, the development of a regenerative additive has been promoted not only by returning the consistency (hardness) to the original level but also by compensating for the shortage in composition and returning it to a composition close to the original. In particular, supplementation of aromatic components is considered effective, and additives containing high concentrations of aromatic compounds, such as highly aromatic mineral oils and animal and vegetable oil additives, have been provided to the market as regenerative additives. It was.
However, the fact that the recyclability of asphalt pavement waste when these additives are used has not been reported so far. For example, in a test in which regeneration (addition of additives for regeneration) and heat deterioration are repeated using deteriorated asphalt with a penetration of about 21 to 25, the elongation and softening point are sufficient along with the penetration over 4 cycles. There is no additive that can be returned to its original level for 100% mineral oil. In general, recycled asphalt is liable to crack, and it is important to recover the elongation, which is an index for the occurrence of cracks.
[0004]
[Problems to be solved by the invention]
Under such circumstances, the present invention is superior in the ability to repeatedly recycle used asphalt, in particular asphalt pavement waste, compared to the conventional one, and can improve problems such as a shortage of waste land and environmental destruction of asphalt pavement waste. An object of the present invention is to provide an additive for recycling such as asphalt pavement waste that can save resources.
[0005]
[Means for Solving the Problems]
As a result of intensive research to achieve the above object, the present inventors have found that the extract oil having a kinematic viscosity and an aniline point in a specific range is excellent in the ability to repeatedly recycle asphalt pavement waste, and It has been found that a recycled asphalt pavement material that can be sufficiently used as a pavement material can be obtained by blending this material with asphalt pavement waste material at a specific ratio. The present invention has been completed based on such findings.
That is, the present invention is an extract oil obtained from a solvent extraction process of petroleum refining, wherein the kinematic viscosity at a temperature of 40 ° C. is 600 to 2000 mm 2 / sec, and the aniline point is 35 ° C. or less. The present invention provides an additive for reclaimed asphalt, particularly an additive for regenerating asphalt pavement waste.
[0006]
The additive of the present invention is applied to the regeneration of asphalt used for various purposes, and is particularly preferably applied to asphalt pavement waste. Here, various types of asphalt pavement waste can be mentioned, but asphalt pavement waste generated during various constructions, for example, asphalt pavement waste generated during subway construction, underground piping work, road pavement work, etc. it can. As this asphalt pavement waste material, the asphalt having a penetration of 20 or more, particularly 25 or more is preferable because it can be easily recycled. The penetration is a value obtained at 25 ° C. according to JIS K-2207 (unit: 1/10 mm).
[0007]
The additive of the present invention comprises an extract oil obtained from a solvent extraction step of petroleum refining, has a kinematic viscosity at a temperature of 40 ° C. in the range of 600 to 2000 mm 2 / sec, and has an aniline point of 35 ° C. or less. It is necessary. If the kinematic viscosity is less than 600 mm 2 / sec, the reproducibility is insufficient, and if it exceeds 2000 mm 2 / sec, handling in the regeneration plant becomes complicated. A preferable kinematic viscosity at a temperature of 40 ° C. is in the range of 900 to 1600 mm 2 / sec from the viewpoints of reproducibility and handling. On the other hand, if the aniline point exceeds 35 ° C., repeated reproducibility becomes insufficient. In order to improve the repeatability, the aniline point is particularly preferably 10 ° C. or lower. The kinematic viscosity and the aniline point are values obtained based on JIS K-2283 and JIS K-2256, respectively. Further, the extract oil preferably has a viscosity index of -60 or less, particularly -100 or less in terms of reproducibility.
[0008]
The extract oil having such properties, there are extract oil which is solvent extracted at naphthenic oil refining. The extract oil that is solvent-extracted during refining of naphthenic oil has the same composition (saturated content, aromatic content, and resin content) compared to extract oil that is solvent-extracted during refining of paraffinic oil and the like. However, the aniline point is low and the chemical structure is estimated to be quite different. Extract oils having a low aniline point have good repeatability, and therefore it is essential that the extract oil be solvent extracted during naphthenic oil refining.
The additive for reclaiming asphalt pavement waste according to the present invention having such properties is superior in repetitive regeneration ability of asphalt pavement waste as compared with the conventional one.
[0009]
Next, when reclaiming asphalt pavement waste using the additive of the present invention, the blending amount of the additive recovers the penetration and elongation of the asphalt in the waste to desired values. It should be selected in the range of 1 to 30% by weight based on the weight of asphalt in the waste material. If the blending amount is less than 1% by weight, the penetration and elongation of asphalt in the recycled asphalt paving material will not recover to the desired values, and the regeneration effect is insufficient, so that the paved surface when paved. Problems such as cracking may occur. On the other hand, if it exceeds 30% by weight, the regeneration effect becomes excessive, and in particular, the penetration exceeds the desired value, and the flow resistance tends to decrease. From the viewpoints of appropriate regeneration effect and flow resistance, the particularly preferred blending amount is in the range of 3 to 17% by weight.
[0010]
【Example】
EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
Examples 1 and 2, Reference Example 1 and Comparative Examples 1 to 3
New straight asphalts 60 to 80 were forcibly deteriorated with a dryer at 200 ° C. to produce deteriorated asphalts with a penetration of 25. The penetration is a value determined at 25 ° C. according to JIS K-2207 (unit: 1/10 mm).
Next, using this deteriorated asphalt, regeneration (incorporating additives having the properties shown in Table 1) and heat deterioration (thin film heating test, JIS K-2207) are repeated, and the number of regeneration passes [elongation (15 ° C ) Number of regenerations of 100 cm or more], softening point acceptable number of regenerations (softening point 44.0 to 52.0 ° C. number of regenerations) and regeneration compounding amount (when the elongation passed). Regeneration of asphalt after forced deterioration was performed by adding an additive so that the target penetration was 70 ± 2. The standard for elongation (15 ° C., unit cm) and softening point is based on JIS K-2207 straight asphalt 60-80.
[0011]
In addition, the blending amount of the additive necessary for recovering the penetration of the deteriorated asphalt was determined for the target penetrations of 70 ± 2 and 90 ± 2 at the first regeneration.
These results are shown in Table 2.
The above test method conforms to the method described in “The 19th Japan Road Conference Proceedings” on page 390 (1991) and “20th Japan Road Conference Proceedings” on page 444 (1993). I went there.
Further, the reason why the deteriorated asphalt having a penetration of 25 is used is as follows.
That is, the penetration of degraded asphalt in asphalt pavement waste used for recycled asphalt pavement at 25 ° C. is defined as 20 or more [Japan Road Association, “Plant Recycled Pavement Technology Guidelines” (December 1992 Moon)], the asphalt with a penetration of 25 was adopted by simulating the worst conditions.
[0012]
[Table 1]
[Table 2]
(note)
Kinematic viscosity: JIS K-2283
Viscosity index: JIS K-2283
Aniline point: JIS K-2256
Density: JIS K-2249
Flash point: JIS K-2265
(Crepland type)
Pour point: JIS K-2269
Column chromatographic analysis: JPI-5S-22-83
[0015]
[Table 3]
[Table 4]
As can be seen from Table 2, the number of times of regeneration can be greatly improved even in asphalt 60-80, which is a reclaimed asphalt and demands for elongation.
[0018]
【The invention's effect】
The additive for regenerating asphalt pavement waste material of the present invention is superior in the ability to recycle asphalt pavement waste material as compared with the conventional one. Therefore, by using this regeneration additive, it is possible to improve problems such as a shortage of land for asphalt pavement waste and environmental destruction, and to save resources.
Moreover, the regenerated asphalt pavement material using the asphalt pavement waste material regenerating additive of the present invention can be suitably used for various pavement work without problems such as cracking on the pavement surface.
Claims (3)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13936995A JP3805000B2 (en) | 1995-06-06 | 1995-06-06 | Recycled asphalt additive |
| JP31579398A JPH11222594A (en) | 1995-06-06 | 1998-11-06 | Recycled asphalt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13936995A JP3805000B2 (en) | 1995-06-06 | 1995-06-06 | Recycled asphalt additive |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31579398A Division JPH11222594A (en) | 1995-06-06 | 1998-11-06 | Recycled asphalt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08333515A JPH08333515A (en) | 1996-12-17 |
| JP3805000B2 true JP3805000B2 (en) | 2006-08-02 |
Family
ID=15243729
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13936995A Expired - Lifetime JP3805000B2 (en) | 1995-06-06 | 1995-06-06 | Recycled asphalt additive |
| JP31579398A Pending JPH11222594A (en) | 1995-06-06 | 1998-11-06 | Recycled asphalt |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31579398A Pending JPH11222594A (en) | 1995-06-06 | 1998-11-06 | Recycled asphalt |
Country Status (1)
| Country | Link |
|---|---|
| JP (2) | JP3805000B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4856500B2 (en) * | 2006-08-29 | 2012-01-18 | 昭和シェル石油株式会社 | Asphalt binder |
| JP5744766B2 (en) * | 2012-01-31 | 2015-07-08 | Ｊｘ日鉱日石エネルギー株式会社 | Reclaimed asphalt reclaim additive composition and reclaimed asphalt pavement material |
| JP2016089008A (en) * | 2014-11-04 | 2016-05-23 | 昭和瀝青工業株式会社 | Additive for recycled asphalt |
| JP7195083B2 (en) * | 2018-08-23 | 2022-12-23 | 出光興産株式会社 | Additive for reclaiming deteriorated asphalt and method for producing reclaimed asphalt mixture |
| KR102313593B1 (en) * | 2020-05-14 | 2021-10-19 | 에스케이이노베이션 주식회사 | Additive composition, asphalt composition comprising the same and regenerated asphalt mixture comprising the same |
-
1995
- 1995-06-06 JP JP13936995A patent/JP3805000B2/en not_active Expired - Lifetime
-
1998
- 1998-11-06 JP JP31579398A patent/JPH11222594A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08333515A (en) | 1996-12-17 |
| JPH11222594A (en) | 1999-08-17 |
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