JP2017082531A - Additive for recycled asphalt, recycling asphalt, recycled heating asphalt mixture and pavement body - Google Patents
Additive for recycled asphalt, recycling asphalt, recycled heating asphalt mixture and pavement body Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 121
- 239000000654 additive Substances 0.000 title claims abstract description 45
- 230000000996 additive effect Effects 0.000 title claims abstract description 43
- 239000000203 mixture Substances 0.000 title claims description 28
- 238000004064 recycling Methods 0.000 title abstract 2
- 238000010438 heat treatment Methods 0.000 title description 5
- 239000003208 petroleum Substances 0.000 claims abstract description 40
- 239000011347 resin Substances 0.000 claims abstract description 39
- 229920005989 resin Polymers 0.000 claims abstract description 39
- 125000003118 aryl group Chemical group 0.000 claims abstract description 37
- 238000002156 mixing Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 2
- 238000005504 petroleum refining Methods 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 125000001931 aliphatic group Chemical group 0.000 abstract description 8
- 239000011230 binding agent Substances 0.000 abstract description 5
- 239000004519 grease Substances 0.000 abstract 1
- 230000008929 regeneration Effects 0.000 description 32
- 238000011069 regeneration method Methods 0.000 description 32
- 230000035515 penetration Effects 0.000 description 29
- 235000019484 Rapeseed oil Nutrition 0.000 description 22
- 239000003921 oil Substances 0.000 description 17
- 235000019198 oils Nutrition 0.000 description 17
- 238000000034 method Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 12
- 239000010734 process oil Substances 0.000 description 12
- 230000006866 deterioration Effects 0.000 description 8
- 239000003925 fat Substances 0.000 description 7
- 235000019197 fats Nutrition 0.000 description 7
- 230000001172 regenerating effect Effects 0.000 description 7
- 239000002699 waste material Substances 0.000 description 7
- 239000010775 animal oil Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 235000015112 vegetable and seed oil Nutrition 0.000 description 6
- 239000008158 vegetable oil Substances 0.000 description 6
- 241001465754 Metazoa Species 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 235000013305 food Nutrition 0.000 description 4
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 4
- 238000011084 recovery Methods 0.000 description 3
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 235000019486 Sunflower oil Nutrition 0.000 description 1
- 239000010692 aromatic oil Substances 0.000 description 1
- 239000011384 asphalt concrete Substances 0.000 description 1
- 239000002199 base oil Substances 0.000 description 1
- 235000015278 beef Nutrition 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 231100000260 carcinogenicity Toxicity 0.000 description 1
- 230000007670 carcinogenicity Effects 0.000 description 1
- 239000003240 coconut oil Substances 0.000 description 1
- 235000019864 coconut oil Nutrition 0.000 description 1
- 235000005687 corn oil Nutrition 0.000 description 1
- 239000002285 corn oil Substances 0.000 description 1
- 235000012343 cottonseed oil Nutrition 0.000 description 1
- 239000002385 cottonseed oil Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000010685 fatty oil Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 239000011874 heated mixture Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 235000014593 oils and fats Nutrition 0.000 description 1
- 239000004006 olive oil Substances 0.000 description 1
- 235000008390 olive oil Nutrition 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 125000003367 polycyclic group Chemical group 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000008159 sesame oil Substances 0.000 description 1
- 235000011803 sesame oil Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002600 sunflower oil Substances 0.000 description 1
- 239000003760 tallow Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000010698 whale oil Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Road Paving Structures (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
本発明は、再生アスファルト用添加剤、再生用アスファルト、再生加熱アスファルト混合物及び舗装体に関するものである。 The present invention relates to a reclaimed asphalt additive, a reclaimed asphalt, a regenerated heated asphalt mixture, and a pavement.
アスファルト舗装は、施工後数年を経るとバインダーとして用いるアスファルトが劣化し、結果としてひび割れや、轍、表面骨材の飛散などが発生する。従って、通常５年から１０年程度でアスファルト舗装表面を切削し、新たに舗装を施す作業が行われている。この際に発生する、老化したアスファルト舗装の塊は回収後、破砕されアスファルトコンクリート再生骨材（以下、再生骨材と記す）として新（バージン）アスファルト、新規骨材及び再生アスファルト用添加剤（以下再生添加剤と記す）と加熱混合され、再生加熱アスファルト混合物として使用されている。 Asphalt pavement degrades asphalt used as a binder several years after construction, resulting in cracks, wrinkles, and scattering of surface aggregates. Therefore, the asphalt pavement surface is usually cut in about 5 to 10 years and a new pavement is performed. Aged asphalt pavement lump generated at this time is recovered and then crushed and reclaimed as asphalt concrete recycled aggregate (hereinafter referred to as recycled aggregate) as new (virgin) asphalt, new aggregate and recycled asphalt additive (hereinafter referred to as recycled asphalt additive) It is used as a regenerated and heated asphalt mixture.
この際、再生骨材中に含まれる老化したアスファルトバインダー（以下旧アスファルトと記す）を再生するために石油精製の溶剤抽出工程から得られるプロセスオイルを主体とした添加剤を加えることにより柔軟性（針入度及び伸度など）を回復させることが行われている。かかるプロセスオイルとしては、脂肪族系、ナフテン系、芳香族系のものに分類される。 At this time, in order to regenerate the aged asphalt binder (hereinafter referred to as old asphalt) contained in the recycled aggregate, flexibility can be added by adding an additive mainly composed of process oil obtained from the solvent extraction process of petroleum refining ( It has been carried out to recover the penetration and elongation). Such process oils are classified into aliphatic, naphthenic and aromatic types.
再生骨材中の老化された旧アスファルトは、何回も使用・再生される必要がある。なぜなら、老化したアスファルトを付着した骨材から安価に分離・除去することは技術的に確立されていないからである。そこで、旧アスファルトの再生後の性能を確保するためのひとつの指標として、４回繰り返し再生後の物性を確認することが提案されている（非特許文献１）。 Old aged asphalt in recycled aggregates needs to be used and recycled many times. This is because it has not been technically established to separate and remove aged asphalt from attached aggregate at low cost. Then, as one index for ensuring the performance of the old asphalt after regeneration, it has been proposed to confirm the physical properties after regeneration four times (Non-Patent Document 1).
ここで、ひとつの問題が生じる。先に述べたように、老化したアスファルトを、オイルなどを添加して柔軟性を回復させるにあたって、針入度に関しては、どのようなオイルを用いても、繰り返し回復可能であることは知られている。しかし伸度の回復に関しては、芳香族系プロセスオイル以外を用いた場合、１回目はその基準である１００ｃｍ以上に復活させることが可能であるが、再生２回目以上も安定して伸度を１００ｃｍ以上に回復させることは難しい。 Here, one problem arises. As mentioned earlier, it is known that when using aged asphalt to restore flexibility by adding oil etc., it is possible to repeatedly recover with any oil with respect to the penetration. Yes. However, with regard to recovery of elongation, when other than aromatic process oil is used, the first time can be restored to the standard of 100 cm or more, but the elongation can be stably increased to 100 cm after the second regeneration. It is difficult to recover.
一方、芳香族系プロセスオイルは繰り返し再生においても針入度だけでなく伸度の回復も図れるが、目的の針入度を達成するには非芳香族系オイルよりも添加量を多くする必要があり不経済である。さらに、大きな問題として芳香族系プロセスオイルには、通常アントラセン等の多環芳香族炭化水素（Polycyclic Aromatic Hydrocarbons, ＰＡＨｓあるいはＰＣＡとも呼ばれる）が数％〜１０数％含まれている。この多環芳香族炭化水素の中には、発がん性やその他の環境汚染の原因になるものもあり、本物質を含有することは環境衛生上好ましくない。実際にヨーロッパなどにおいては、ＰＡＨｓ量が３％以上のものは発がん性ありとされ厳しく規制されている。しかし、芳香族系プロセスオイルからＰＡＨｓを完全に除去することは技術的に難しく、またコストがかかるため実際に行われていない。 On the other hand, aromatic process oils can recover not only the penetration but also the elongation even during repeated regeneration, but it is necessary to add more than non-aromatic oils to achieve the desired penetration. Yes, it is uneconomical. Furthermore, as a major problem, the aromatic process oil usually contains several to ten to several percent of polycyclic aromatic hydrocarbons (also called polycyclic aromatic hydrocarbons, PAHs or PCA) such as anthracene. Some of these polycyclic aromatic hydrocarbons cause carcinogenicity and other environmental pollution, and it is not preferable for environmental hygiene to contain this substance. In fact, in Europe and the like, PAHs with 3% or more are considered to be carcinogenic and are strictly regulated. However, complete removal of PAHs from aromatic process oil is technically difficult and costly and has not been done in practice.
この問題を解決すべくいくつかの試みが行われてきた。例えば、特許文献１によれば特定の芳香族系プロセスオイルを使用することによって再生性能の発揮とＰＡＨｓ量の低減を両立させることが可能とされている。しかしこの特許記載の組成の芳香族系プロセスオイルでも、可能なＰＡＨｓの含有量はオイル総量の３重量％以下、実際は１，８％〜２．８％とされている。 Several attempts have been made to solve this problem. For example, according to Patent Document 1, it is possible to achieve both the performance of regeneration and the reduction of the amount of PAHs by using a specific aromatic process oil. However, even in an aromatic process oil having the composition described in this patent, the possible PAHs content is 3% by weight or less of the total amount of oil, and in fact, it is set to be 1.8% to 2.8%.
そこで、劣化したアスファルトバインダー（旧アスファルト）の針入度や伸度を繰り返し回復させることができ、且つ安価で、安全な再生アスファルト用添加剤が求められている。 Therefore, there is a demand for a recyclable asphalt additive that can repeatedly recover the penetration and elongation of deteriorated asphalt binder (former asphalt), is inexpensive, and is safe.
以上のような状況に鑑み、本発明者は鋭意研究の結果、本発明の再生アスファルト用添加剤、再生用アスファルト、再生加熱アスファルト混合物及び舗装体を完成したものであり、その特徴とするところは、添加剤にあっては、芳香族系(Ｃ９系)石油樹脂及び油脂を主成分とする点にある。 In view of the above situation, the inventor has completed the regenerated asphalt additive, reclaimed asphalt, regenerated heated asphalt mixture and pavement of the present invention as a result of earnest research, and the features thereof are as follows. The additive is mainly composed of aromatic (C9) petroleum resin and fats and oils.
芳香族系（Ｃ９系）石油樹脂とは、石油ナフサを熱分解して必要な留分を採取した残りの留分（石油樹脂）のうち、主としてＣ９留分（Ｃ８〜Ｃ１０留分）を重合したものをいう。石油樹脂のうち、主としてＣ５留分を重合したものを脂肪族系（Ｃ５系）石油樹脂という。本発明では、この芳香族系（Ｃ９系）石油樹脂を用いるものである。
通常、分子量は数千、通常は３０００以下であり、オリゴマーの範囲である。
代表的な構造は次式で表される。ｌ、ｍ、ｎは１〜２０の整数である。
Usually, the molecular weight is thousands, usually 3000 or less, in the range of oligomers.
A typical structure is represented by the following formula. l, m, and n are integers of 1-20.
主としてＣ９留分（Ｃ８〜Ｃ１０留分）を重合したものであるが、ここで「主として」とは、重合モノマーの８０重量％以上がＣ９留分であることをいう。 C9 fraction (C8 to C10 fraction) is mainly polymerized. Here, “mainly” means that 80% by weight or more of the polymerization monomer is C9 fraction.
また、油脂とは、いわゆる動植物油であり常温で液体である脂肪油と固体である脂肪に分類される。また、化学的には脂肪酸とグリセリンのエステルである。本発明に用いる油脂は特に限定されるものではなく、食用に供される動植物油として知られているものでよい。例えば、動物油としては、バター、牛脂、豚脂、馬油、鯨油等であり、植物油としては、菜種油、大豆油、コーン油、ごま油、ひまわり油、オリーブ油、ココナツ油、綿実油等である。これらの油脂は単体でも、また混合物としても使用できるが基本的には、融点が低いものが取扱い上好ましい。例えば、０℃以下において流動性を保つものが好適である。 Oils and fats are so-called animal and vegetable oils, and are classified into fatty oils that are liquid at room temperature and fats that are solid. Chemically, it is an ester of fatty acid and glycerin. The fats and oils used in the present invention are not particularly limited, and may be those known as animal and vegetable oils used for food. For example, animal oils include butter, beef tallow, lard, horse oil, whale oil, and vegetable oils include rapeseed oil, soybean oil, corn oil, sesame oil, sunflower oil, olive oil, coconut oil, cottonseed oil, and the like. These fats and oils can be used alone or as a mixture, but basically those having a low melting point are preferred for handling. For example, those that maintain fluidity at 0 ° C. or lower are suitable.
さらに、これらの動植物油は食品加工場などから回収された廃油であってもよい。舗装に使用する場合、バージンでも廃油でも大した差はないためである。このように、廃油を使用すれば、省エネになるだけでなく廃棄物の処理にもなり一石二鳥である。 Furthermore, these animal and vegetable oils may be waste oil recovered from food processing plants and the like. This is because there is no significant difference between virgin and waste oil when used for paving. In this way, if waste oil is used, not only will it save energy, but it will also handle waste, and it will be two birds with one stone.
本発明においては、上記の芳香族系(Ｃ９系)石油樹脂と油脂を使用するものであるが、その混合割合は、芳香族系(Ｃ９系)石油樹脂：油脂＝１０：９０〜６０：４０が好適である。芳香族系(Ｃ９系)石油樹脂の割合が１０％以下の場合、４回繰り返し再生した場合の伸度の回復が十分でなく、逆に６０％を超えると再生したアスファルトの針入度が回復しない。 In the present invention, the above aromatic (C9) petroleum resin and oil / fat are used, and the mixing ratio thereof is aromatic (C9) petroleum resin: fat / oil = 10: 90 to 60:40. Is preferred. When the ratio of aromatic (C9) petroleum resin is 10% or less, the recovery of elongation is not sufficient when it is regenerated four times. Conversely, when it exceeds 60%, the penetration of regenerated asphalt is recovered. do not do.
上記芳香族系(Ｃ９系)石油樹脂及び油脂を主成分とするのであるが、ここで「主成分」とは、添加剤としての効果を発揮するものであるとい意味であり、量や割合の問題ではない。本発明の効果とは異なるもので、阻害もしないものを加えて、本発明権利から逃れることはできない。しかし、一般的には、上記成分が５０重量％以上、好ましくは８０重量％以上である。 The above-mentioned aromatic (C9) petroleum resin and fats and oils are the main components. Here, the “main component” means that the effect as an additive is exhibited, is not a problem. It is different from the effect of the present invention, and it cannot escape from the right of the present invention by adding what is not obstructed. However, in general, the above components are 50% by weight or more, preferably 80% by weight or more.
上記の比率の混合物を再生加熱アスファルト混合物用の再生添加剤として使用する。再生加熱アスファルト混合物は、再生骨材と新規骨材に新アスファルト及び再生添加剤を加えて１８０℃前後で加熱混合することにより得られる。その際使用する再生骨材中の旧アスファルトの品質及び含有量により使用の可否判断を行い、再生骨材の混合比率から他の成分の混合比を決定する。まず、再生骨材より抽出された旧アスファルトが所定の含有量を満たしており、かつ針入度あるいは圧裂係数のどちらかにおいて「舗装再生便覧」記載の基準を満たしていれば、再生骨材として再生加熱アスファルト混合物に使用可能と判断される。この再生骨材の配合比率により、新規骨材、新アスファルト、再生添加剤の量を決定する。この際、再生添加剤を新アスファルト中に予め添加した再生用アスファルトの形で使用してもよい。 The mixture in the above ratio is used as a regenerative additive for a regenerated heated asphalt mixture. The regenerated heated asphalt mixture is obtained by adding new asphalt and a regenerated additive to regenerated aggregate and new aggregate and heating and mixing at around 180 ° C. At that time, the use of the old asphalt in the recycled aggregate to be used is judged based on the quality and content, and the mixing ratio of the other components is determined from the mixing ratio of the recycled aggregate. First, if the old asphalt extracted from the recycled aggregate satisfies the specified content and meets the criteria described in the “Paving Recycle Manual” in either the penetration or the crush coefficient, the recycled aggregate As reusable and heated asphalt mixture. The amount of new aggregate, new asphalt, and regenerative additive is determined by the ratio of this recycled aggregate. At this time, the regeneration additive may be used in the form of regeneration asphalt added in advance to the new asphalt.
このように製造された再生加熱アスファルト混合物は通常の加熱混合物を用いた施工方法によって使用され舗装体となる。過去の実績から、旧アスファルトと新アスファルト及び再生添加剤を加熱混合して得られる再生アスファルトの性状が「舗装再生便覧」記載の基準を満たしていれば、舗装用アスファルトとして問題なく使用できることが実証されている。 The regenerated heated asphalt mixture produced in this way is used as a pavement by a construction method using a normal heated mixture. Based on past results, if the properties of reclaimed asphalt obtained by heating and mixing old asphalt, new asphalt, and regenerative additives meet the standards described in the Pavement Reproduction Manual, it can be used without problems as paving asphalt. Has been.
本発明添加剤には次のような効果がある。
（１） 樹脂と油脂から成り、有害な多環芳香族炭化水素を全く含まない非常に安全な添加剤である。
（２） 本再生添加剤の添加によって得られる再生加熱アスファルト混合物は、供用後の劣化した状態でも繰り返し再生可能なアスファルト性状を維持することができる。
（３） 比較的引火点が高いため安全である。
（４） 芳香族系エキストラクト油よりも再生効果が優れているため、使用量を削減できる。
（５） 動植物油を混合することにより安全性を維持したまま、求められる繰り返し再生数に応じて、再生アスファルトの性状を調整できる。また廃動植物油を使用した場合は環境負荷を低減できる。
（６） 価格的にも安価である。
The additive of the present invention has the following effects.
(1) It is a very safe additive that consists of resin and oil and does not contain any harmful polycyclic aromatic hydrocarbons.
(2) The regenerated and heated asphalt mixture obtained by the addition of the present regenerating additive can maintain asphalt properties that can be repeatedly regenerated even in a deteriorated state after use.
(3) Safe because of its relatively high flash point.
(4) Since the regeneration effect is superior to aromatic extract oils, the amount used can be reduced.
(5) The properties of regenerated asphalt can be adjusted according to the required number of repeated regenerations while maintaining safety by mixing animal and vegetable oils. Moreover, when waste animal and vegetable oil is used, an environmental load can be reduced.
(6) It is inexpensive in price.
以下実施例に基づいて、本発明をより詳細に説明する。各試験は通常の舗装用アスファルトに関する試験方法に準拠して行った。また、ＰＡＨｓ量の測定は”The Institute of Petroleum”のIP346/92 “Determination of polycyclic aromatics in unused lubricating base oils and asphaltene free petroleum fractions – Dimethyl sulfoxide extraction refractive index method”の方法に準拠した。 Hereinafter, based on an Example, this invention is demonstrated in detail. Each test was conducted in accordance with a test method for ordinary asphalt for paving. The amount of PAHs was measured according to the method of IP346 / 92 “Determination of polycyclic aromatics in unused lubricant base oils and asphaltene free petroleum fractions – Dimethyl sulfoxide extraction refractive index method” of “The Institute of Petroleum”.
実施例１
再生骨材より抽出した針入度２３（１／１０ｍｍ）の旧アスファルト５０重量部と針入度６８の新アスファルト５０重量部、再生添加剤として、芳香族系(Ｃ９系)石油樹脂（ＪＸ 日鉱日石エネルギー株式会社製：日石ネオポリマー１４０）０．５重量部、菜種油３．１重量部（石油樹脂：菜種油＝１４：８６）を１６０℃加熱下に１時間撹拌し、アスファルト混合物を得た。得られたアスファルト混合物の針入度は７０、伸度は１００ｃｍ以上であった。このアスファルト混合物に対して薄膜加熱試験（１６３℃、５時間）ならびに加圧劣化試験（１００℃、２．１ＭＰａ、２０時間）により強制劣化させ、通常の環境で舗設後５年間使用された後の再生骨材中の旧アスファルトの性状と同等の劣化状態にした。この劣化後のアスファルトを初めに再生骨材から抽出した旧アスファルトに対して行ったのと同じ手順により（ただし再生添加剤の総添加量は針入度７０付近になるように調整）再生し、同様の強制劣化試験を繰り返した。本再生添加剤を用いた場合は４回まで、針入度を７０±５、伸度１００ｃｍ以上の初期状態に再現できた。その結果を他の実験例とともに表１に示す。
Example 1
50 parts by weight of old asphalt with a penetration of 23 (1/10 mm) extracted from recycled aggregate and 50 parts by weight of new asphalt with a penetration of 68, aromatic (C9) petroleum resin (JX Nippon Mining) Nisseki Energy Co., Ltd .: Nisseki Neopolymer 140) 0.5 parts by weight, rapeseed oil 3.1 parts by weight (petroleum resin: rapeseed oil = 14: 86) is stirred for 1 hour under heating at 160 ° C. to obtain an asphalt mixture. It was. The obtained asphalt mixture had a penetration of 70 and an elongation of 100 cm or more. This asphalt mixture was forcibly deteriorated by a thin film heating test (163 ° C., 5 hours) and a pressure deterioration test (100 ° C., 2.1 MPa, 20 hours), and after being used for 5 years after paving in a normal environment. The deterioration condition is equivalent to that of the old asphalt in the recycled aggregate. This deteriorated asphalt is regenerated by the same procedure as that used for the old asphalt first extracted from the recycled aggregate (however, the total amount of the regenerated additive is adjusted so that the penetration is about 70). The same forced deterioration test was repeated. When this regeneration additive was used, the initial penetration state of 70 ± 5 and elongation of 100 cm or more could be reproduced up to 4 times. The results are shown in Table 1 together with other experimental examples.
実施例２
実施例１と同じ旧アスファルト、新アスファルトを用い、旧アスファルト５０重量部、新アスファルト５０重量部の比率のものに、芳香族系(Ｃ９系)石油樹脂１．５重量部、菜種油３．７（石油樹脂：菜種油＝２９：７１）を実施例１と同様の方法で加熱混合し、針入度７１、伸度１００ｃｍのアスファルト混合物を得た。このアスファルト混合物に対して実施例１と同様の方法で通常の環境で舗設後５年間使用された後の再生骨材中の旧アスファルトの性状と同等の劣化状態にした。この劣化後のアスファルトを実施例１と同様の方法で再生し、強制劣化試験を繰り返した。本再生添加剤を用いた場合は４回まで、針入度を７０±５、伸度１００ｃｍ以上の初期状態に再現できた。結果を他の実施例とともに表１に示す。
Example 2
Using the same old asphalt and new asphalt as in Example 1, the ratio of old asphalt 50 parts by weight and new asphalt 50 parts by weight, aromatic (C9 series) petroleum resin 1.5 parts by weight, rapeseed oil 3.7 ( Petroleum resin: rapeseed oil = 29: 71) was heated and mixed in the same manner as in Example 1 to obtain an asphalt mixture having a penetration of 71 and an elongation of 100 cm. This asphalt mixture was brought into a deteriorated state equivalent to the properties of the old asphalt in the recycled aggregate after being used for 5 years after paving in a normal environment in the same manner as in Example 1. This deteriorated asphalt was regenerated by the same method as in Example 1, and the forced deterioration test was repeated. When this regeneration additive was used, the initial penetration state of 70 ± 5 and elongation of 100 cm or more could be reproduced up to 4 times. The results are shown in Table 1 together with other examples.
実施例３
実施例１と同じ旧アスファルト、新アスファルトを用い、旧アスファルト５０重量部、新アスファルト５０重量部の比率のものに芳香族系(Ｃ９系)石油樹脂２．５重量部、菜種油４．２重量部（石油樹脂：菜種油＝３７：６３）を実施例１と同様の方法で加熱混合し、針入度７０、伸度１００ｃｍ以上のアスファルト混合物を得た。このアスファルト混合物に対して実施例１と同様の方法で、通常の環境で舗設後５年間使用された後の再生骨材中の旧アスファルトの性状と同等の劣化状態にした。この劣化後のアスファルトを実施例１と同様の方法で再生し、強制劣化試験を繰り返した。本再生添加剤を用いた場合は４回まで、針入度を７０±５、伸度１００ｃｍ以上の初期状態に再現できた。結果を他の実施例とともに表１に示す。
Example 3
Using the same old asphalt and new asphalt as in Example 1, the ratio of old asphalt 50 parts by weight, new asphalt 50 parts by weight, aromatic (C9) petroleum resin 2.5 parts by weight, rapeseed oil 4.2 parts by weight (Petroleum resin: rapeseed oil = 37: 63) was heated and mixed in the same manner as in Example 1 to obtain an asphalt mixture having a penetration of 70 and an elongation of 100 cm or more. In the same manner as in Example 1, the asphalt mixture was brought into a deteriorated state equivalent to the properties of the old asphalt in the recycled aggregate after being used for 5 years after paving in a normal environment. This deteriorated asphalt was regenerated by the same method as in Example 1, and the forced deterioration test was repeated. When this regeneration additive was used, the initial penetration state of 70 ± 5 and elongation of 100 cm or more could be reproduced up to 4 times. The results are shown in Table 1 together with other examples.
実施例４
実施例１と同じ旧アスファルト、新アスファルトを用い、旧アスファルト７０重量部、新アスファルト３０重量部の比率のものに芳香族系(Ｃ９系)石油樹脂１．５重量部、菜種油４．６重量部（石油樹脂：菜種油＝２５：７５）を実施例１と同様の方法で加熱混合し、針入度６８、伸度１００ｃｍ以上のアスファルト混合物を得た。このアスファルト混合物に対して実施例１と同様の方法で、通常の環境で舗設後５年間使用された後の再生骨材中の旧アスファルトの性状と同等の劣化状態にした。この劣化後のアスファルトを実施例１と同様の方法で再生し、強制劣化試験を繰り返した。本再生添加剤を用いた場合は４回まで、針入度を７０±５、伸度１００ｃｍ以上の初期状態に再現できた。結果を他の実施例とともに表１に示す。
Example 4
Using the same old asphalt and new asphalt as in Example 1, the ratio of old asphalt 70 parts by weight, new asphalt 30 parts by weight aromatic (C9) petroleum resin 1.5 parts by weight, rapeseed oil 4.6 parts by weight (Petroleum resin: rapeseed oil = 25: 75) was heated and mixed in the same manner as in Example 1 to obtain an asphalt mixture having a penetration of 68 and an elongation of 100 cm or more. In the same manner as in Example 1, the asphalt mixture was brought into a deteriorated state equivalent to the properties of the old asphalt in the recycled aggregate after being used for 5 years after paving in a normal environment. This deteriorated asphalt was regenerated by the same method as in Example 1, and the forced deterioration test was repeated. When this regeneration additive was used, the initial penetration state of 70 ± 5 and elongation of 100 cm or more could be reproduced up to 4 times. The results are shown in Table 1 together with other examples.
実施例５
実施例１と同じ旧アスファルト、新アスファルトとして針入度６８のものに代えて針入度８８のものを用い、旧アスファルト５０重量部、新アスファルト５０重量部の比率のものに芳香族系(Ｃ９系)石油樹脂１．５重量部、菜種油３．０重量部（石油樹脂：菜種油＝３３：６７）を実施例１と同様の方法で加熱混合し、針入度７０、伸度１００ｃｍ以上のアスファルト混合物を得た。このアスファルト混合物に対して実施例１と同様の方法で、通常の環境で舗設後５年間使用された後の再生骨材中の旧アスファルトの性状と同等の劣化状態にした。この劣化後のアスファルトを実施例１と同様の方法で再生し、強制劣化試験を繰り返した。本再生添加剤を用いた場合は４回まで、針入度を７０±５、伸度１００ｃｍ以上の初期状態に再現できた。結果を他の実施例とともに表１に示す。
Example 5
The same old asphalt and new asphalt as in Example 1 were used instead of those with a penetration of 68, and those with a ratio of 50 parts by weight of old asphalt and 50 parts by weight of new asphalt were aromatic (C9 System) 1.5 parts by weight of petroleum resin and 3.0 parts by weight of rapeseed oil (petroleum resin: rapeseed oil = 33: 67) are heated and mixed in the same manner as in Example 1, and the asphalt has a penetration of 70 and an elongation of 100 cm or more. A mixture was obtained. In the same manner as in Example 1, the asphalt mixture was brought into a deteriorated state equivalent to the properties of the old asphalt in the recycled aggregate after being used for 5 years after paving in a normal environment. This deteriorated asphalt was regenerated by the same method as in Example 1, and the forced deterioration test was repeated. When this regeneration additive was used, the initial penetration state of 70 ± 5 and elongation of 100 cm or more could be reproduced up to 4 times. The results are shown in Table 1 together with other examples.
実施例６
実施例１と同じ旧アスファルト、新アスファルトを用い、旧アスファルト５０重量部、新アスファルト５０重量部の比率のものに芳香族系(Ｃ９系)石油樹脂１．５重量部、廃食物油３．７重量部（石油樹脂：廃食物油＝２９：７１）を実施例１と同様の方法で加熱混合し、針入度６８、伸度１００ｃｍ以上のアスファルト混合物を得た。このアスファルト混合物に対して実施例１と同様の方法で、通常の環境で舗設後５年間使用された後の再生骨材中の旧アスファルトの性状と同等の劣化状態にした。この劣化後のアスファルトを実施例１と同様の方法で再生し、強制劣化試験を繰り返した。本再生添加剤を用いた場合は４回まで、針入度を７０±５、伸度１００ｃｍ以上の初期状態に再現できた。結果を他の実施例とともに表１に示す。
Example 6
Using the same old asphalt and new asphalt as in Example 1, the ratio of old asphalt 50 parts by weight, new asphalt 50 parts by weight, aromatic (C9) petroleum resin 1.5 parts by weight, waste food oil 3.7 Part by weight (petroleum resin: waste food oil = 29: 71) was heated and mixed in the same manner as in Example 1 to obtain an asphalt mixture having a penetration of 68 and an elongation of 100 cm or more. In the same manner as in Example 1, the asphalt mixture was brought into a deteriorated state equivalent to the properties of the old asphalt in the recycled aggregate after being used for 5 years after paving in a normal environment. This deteriorated asphalt was regenerated by the same method as in Example 1, and the forced deterioration test was repeated. When this regeneration additive was used, the initial penetration state of 70 ± 5 and elongation of 100 cm or more could be reproduced up to 4 times. The results are shown in Table 1 together with other examples.
比較例１
実施例１と同様のアスファルト原料及び方法で、再生添加剤を菜種油のみに変えて試験を行った。再生添加剤（菜種油）を２．６重量部加えて針入度６８の再生アスファルトを得た。本添加剤を用いた場合、再生１回目では伸度１００ｃｍを示したが、再生２回目で９０ｃｍとなり、アスファルトとして十分な性能を示さなかった。結果を他の比較例とともに表２に示す。
Comparative Example 1
With the same asphalt raw material and method as in Example 1, the regeneration additive was changed to only rapeseed oil, and the test was conducted. 2.6 parts by weight of a regenerative additive (rapeseed oil) was added to obtain regenerated asphalt with a penetration of 68. When this additive was used, the elongation was 100 cm at the first regeneration, but it was 90 cm at the second regeneration, and did not exhibit sufficient performance as asphalt. The results are shown in Table 2 together with other comparative examples.
比較例２
実施例１と同様のアスファルト原料及び方法で、再生添加剤を脂肪族プロセスオイルのみに変えて試験を行った。再生添加剤（脂肪族プロセスオイル）を４．０重量部加えて針入度６８の再生アスファルトを得た。本添加剤を用いた場合、再生１回目では伸度１００ｃｍを示したが、再生２回目で６８ｃｍとなり、アスファルトとして十分な性能を示さなかった。なお、再生添加剤中のＰＡＨｓ量は、０．４％であった。結果を他の比較例とともに表２に示す。
Comparative Example 2
A test was conducted using the same asphalt raw material and method as in Example 1 except that the regeneration additive was changed to an aliphatic process oil only. 4.0 parts by weight of a regenerative additive (aliphatic process oil) was added to obtain regenerated asphalt with a penetration of 68. When this additive was used, the elongation was 100 cm at the first regeneration, but it was 68 cm at the second regeneration, and did not exhibit sufficient performance as asphalt. The amount of PAHs in the regeneration additive was 0.4%. The results are shown in Table 2 together with other comparative examples.
比較例３
実施例１と同様のアスファルト原料及び方法で、再生添加剤を芳香族系プロセスオイル(芳香族分３９％)のみに変えて試験を行った。再生添加剤（芳香族プロセスオイル）を４．５重量部加えて針入度７０の再生アスファルトを得た。本添加剤を用いた場合、４回繰り返し再生を行っても伸度は１００ｃｍ以上を示し、十分な性状回復が確認された。一方、再生添加剤中のＰＡＨｓ量３．１％であった。結果を他の比較例とともに表２に示す。
Comparative Example 3
A test was conducted using the same asphalt raw material and method as in Example 1, except that the regeneration additive was changed to an aromatic process oil (aromatic content 39%) only. 4.5 parts by weight of a regenerative additive (aromatic process oil) was added to obtain regenerated asphalt with a penetration of 70. When this additive was used, even after repeated regeneration four times, the elongation was 100 cm or more, and sufficient property recovery was confirmed. On the other hand, the amount of PAHs in the regeneration additive was 3.1%. The results are shown in Table 2 together with other comparative examples.
比較例４
実施例１と同様のアスファルト原料及び方法で、石油樹脂を芳香族系(Ｃ９系)石油樹脂から脂肪族系（Ｃ５系）のものに変えて試験を行った。再生添加剤として脂肪族系（Ｃ５系）石油樹脂を１．５重量部、菜種油３．４重量部（Ｃ５系石油樹脂：菜種油＝３１：６９）加えて、針入度７１の再生アスファルトを得た。本添加剤を用いた場合、再生１回目では伸度１００ｃｍを示したが再生２回目で８５ｃｍとなり、アスファルトとして十分な性能を示さなかった。結果を他の比較例とともに表２に示す。
Comparative Example 4
Using the same asphalt raw material and method as in Example 1, the test was performed by changing the petroleum resin from an aromatic (C9) petroleum resin to an aliphatic (C5) one. 1.5 parts by weight of aliphatic (C5) petroleum resin and 3.4 parts by weight of rapeseed oil (C5 petroleum resin: rapeseed oil = 31: 69) are added as regeneration additives to obtain recycled asphalt with a penetration of 71 It was. When this additive was used, the elongation was 100 cm at the first regeneration, but it was 85 cm at the second regeneration, and did not exhibit sufficient performance as asphalt. The results are shown in Table 2 together with other comparative examples.
比較例５
実施例１と同様のアスファルト原料及び方法で、芳香族系(Ｃ９系)石油樹脂と菜種油の比率を変えて試験を行った。芳香族系(Ｃ９系)石油樹脂を０．２５重量部、菜種油を３重量部加えて針入度７０の再生アスファルトを得た。このときの石油樹脂と菜種油の比率は、芳香族系(Ｃ９系)石油樹脂：菜種油＝８：９２であった。本添加剤を用いた場合、再生３回目までは伸度１００ｃｍを示したが再生４回目で７５ｃｍとなり、アスファルトとして十分な性能を示さなかった。結果を他の比較例とともに表２に示す。
Comparative Example 5
The same asphalt raw material and method as in Example 1 were used, and the test was conducted while changing the ratio of aromatic (C9) petroleum resin and rapeseed oil. Recycled asphalt having a penetration of 70 was obtained by adding 0.25 parts by weight of aromatic (C9) petroleum resin and 3 parts by weight of rapeseed oil. The ratio of petroleum resin to rapeseed oil at this time was aromatic (C9) petroleum resin: rapeseed oil = 8: 92. When this additive was used, the elongation was 100 cm until the third regeneration, but it was 75 cm at the fourth regeneration, and did not show sufficient performance as asphalt. The results are shown in Table 2 together with other comparative examples.
比較例６
実施例１と同様のアスファルト原料及び方法で、芳香族系(Ｃ９系)石油樹脂と菜種油の比率を芳香族系(Ｃ９系)石油樹脂１．５重量部、菜種油を０．９重量部（石油樹脂：菜種油＝６３：３７）にして加えたところ得られた針入度は３９とほとんど改善を示さなかった。結果を他の比較例とともに表２に示す。
Comparative Example 6
Using the same asphalt raw material and method as in Example 1, the ratio of aromatic (C9) petroleum resin to rapeseed oil is 1.5 parts by weight of aromatic (C9) petroleum resin and 0.9 parts by weight of rapeseed oil (petroleum oil). Resin: rapeseed oil = 63: 37) When the addition was made, the penetration was 39, showing almost no improvement. The results are shown in Table 2 together with other comparative examples.
Claims (7)
A pavement obtained using the regenerated heated asphalt mixture according to claim 6.
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