JP6467087B1 - Asphalt mixture for thin pavement, repair method for paved road and paved road - Google Patents

Asphalt mixture for thin pavement, repair method for paved road and paved road Download PDF

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JP6467087B1
JP6467087B1 JP2018105609A JP2018105609A JP6467087B1 JP 6467087 B1 JP6467087 B1 JP 6467087B1 JP 2018105609 A JP2018105609 A JP 2018105609A JP 2018105609 A JP2018105609 A JP 2018105609A JP 6467087 B1 JP6467087 B1 JP 6467087B1
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英典 志田
英典 志田
高橋 勝彦
勝彦 高橋
和彦 小森田
和彦 小森田
廣之 西野
廣之 西野
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英典 志田
英典 志田
株式会社伊藤組
株式会社ネクスコ・メンテナンス東北
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Abstract

【課題】安価で大量供給が可能であり、かつ、耐久性を向上させることができる薄層舗装用アスファルト混合物、それを用いた舗装道路の補修方法、及び、それにより補修された舗装道路を提供する。【解決手段】薄層舗装用アスファルト混合物1は、骨材及びアスファルトを加熱混合して得られるものであって、骨材は、最大粒径が8mm未満であり、その粒度分布は、粒径2.36mm以上8mm未満の粗骨材が65質量%以上80質量%以下の範囲内、粒径0.3mm以上1mm未満の細骨材が5質量%以上25質量%以下の範囲内、粒径0.075mm以上0.3mm未満の細砂及び粒径0.075mm未満の石粉の合計が5質量%以上25質量%以下の範囲内のものである。【選択図】図1The present invention provides an asphalt mixture for thin layer pavement that can be supplied at low cost and in large quantities and can improve durability, a method for repairing a paved road using the mixture, and a paved road repaired thereby. To do. An asphalt mixture for thin layer pavement 1 is obtained by heating and mixing aggregate and asphalt, and the aggregate has a maximum particle size of less than 8 mm, and its particle size distribution is 2 Coarse aggregate of 36 mm or more and less than 8 mm is in the range of 65 mass% or more and 80 mass% or less, Fine aggregate of particle diameter of 0.3 mm or more and less than 1 mm is in the range of 5 mass% or more and 25 mass% or less, particle size 0 The total of fine sand of 0.075 mm or more and less than 0.3 mm and stone powder having a particle size of less than 0.075 mm is within the range of 5 mass% or more and 25 mass% or less. [Selection] Figure 1

Description

本発明は、舗装道路の補修に用いる薄層舗装用アスファルト混合物、それを用いた舗装道路の補修方法、及び、それにより補修された舗装道路に関する。   The present invention relates to an asphalt mixture for thin layer pavement used for repairing a paved road, a method for repairing a paved road using the mixture, and a paved road repaired thereby.

道路の舗装方法にはコンクリート舗装とアスファルト舗装がある。このうちアスファルト舗装された道路では、トラックやバス等の重車両が頻繁に通過するとタイヤから受ける荷重によってアスファルトが軟化、変形し、タイヤ通過領域に轍掘れと呼ばれる長い凹みや部分的な窪みが生ずる。コンクリート舗装道路でも、コンクリートのひび割れや破壊により窪みが生ずることがある。路面に轍掘れや窪みが存在すると、タイヤがそれらに入り込んだときにハンドルをとられたり、雨水が溜まってスリップしたりすることがあり事故の原因となる。このため轍掘れや窪みが生じた場合は、ひどくなる前に補修が行なわれる。   There are concrete and asphalt pavement methods. Of these, on asphalt paved roads, heavy vehicles such as trucks and buses frequently pass and the asphalt softens and deforms due to the load received from the tires, resulting in long dents and partial depressions called digging in the tire passage area. . Even on concrete paved roads, depressions may occur due to cracking or destruction of concrete. If there are digging or depressions on the road surface, the tires may be taken when they enter, or rainwater may accumulate and slip, causing an accident. For this reason, repairing is performed before it becomes severe when pit digging or dents occur.

アスファルト舗装路面の場合の補修工法としては、路面のアスファルトを加熱し、かきほぐして新規材料も加えて再生使用する再生工法、補修部分のアスファルトを切削除去して新たなアスファルト混合物で敷き直す切削オーバーレイ工法、切削せずに補修部分を清掃した後に新たなアスファルト混合物を充填して敷きならすオーバーレイ工法などがある。   In the case of asphalt paved road surfaces, repair methods include heating the road surface asphalt, scraping and adding new materials for reuse, cutting and removing the asphalt in the repair area, and re-laying with a new asphalt mixture There are methods such as the overlay method that cleans the repaired part without cutting and then fills it with a new asphalt mixture.

このうち、再生工法は路面加熱を伴うため大型装置を必要とし補修に時間がかかる問題がある。補修部分のアスファルトの切削除去を伴う切削オーバーレイ工法は、工事が大規模となって補修に時間がかかり費用も高くなる。加えて廃棄物の発生量が多い問題もある。補修部分のアスファルトを切削せず清掃した後に新たなアスファルト混合物を充填して敷きならすオーバーレイ工法は、補修に要する時間が短く、廃棄物が発生せず、費用も安くて済む利点がある。   Among these, the regenerative construction method involves road heating and requires a large apparatus, and there is a problem that it takes time to repair. The cutting overlay method that involves removing and removing asphalt in the repaired part is time-consuming and expensive due to the large-scale construction. In addition, there is a problem that the amount of waste generated is large. The overlay method, in which the asphalt in the repaired portion is cleaned without being cut and then filled with a new asphalt mixture and spread, has the advantage that the time required for repair is short, no waste is generated, and the cost is low.

しかし、従来のこの切削を伴わない工法による補修個所は、暫くすると補修個所周縁部に充填、転圧されたアスファルト部分に割れが生じ、周縁部のアスファルト混合物が剥離飛散してしまう問題があった。このため短期間で補修を繰り返さなければならず、交通量の多い道路の補修に適用することは困難であった。   However, the conventional repairing site that does not involve cutting has a problem that after a while, the peripheral part of the repairing part is filled and rolled, the cracked asphalt part is cracked and the asphalt mixture at the peripheral part is separated and scattered. . For this reason, repairs had to be repeated in a short period of time, and it was difficult to apply them to roads with heavy traffic.

そこで、粒径が2.36〜8.00mmの粗骨材70〜85質量%と、アスファルトと、フィラーとしての粒径0.3mm以下の細砂又は粒径0.075mm以下の石粉又はその双方と、を加熱混練してなる加熱アスファルト混合物を、轍掘れや窪みの凹部内と凹部の外側縁部とに充填、敷設し、上部より転圧する方法が提案されている(特許文献1参照)。この方法では、粗骨材の粒径を小さくすると共に、粗骨材を被覆するアスファルトの厚みを厚くするためにアスファルトの中に包含される0.3mm以下のフィラーを多くすることにより、既設の舗装路面に付着する力を強くし、補設部分の剥がれを防止するようにしている。   Therefore, 70 to 85% by mass of coarse aggregate having a particle size of 2.36 to 8.00 mm, asphalt, fine sand having a particle size of 0.3 mm or less as a filler, stone powder having a particle size of 0.075 mm or less, or both A method has been proposed in which a heated asphalt mixture formed by heating and kneading is filled and laid in the inside of the recessed portion of the digging or indentation and the outer edge of the recessed portion, and then rolled from above (see Patent Document 1). In this method, the particle size of the coarse aggregate is reduced, and the filler of 0.3 mm or less included in the asphalt is increased in order to increase the thickness of the asphalt covering the coarse aggregate. The force attached to the paved road surface is strengthened to prevent the auxiliary part from peeling off.

特許第4101858号公報Japanese Patent No. 4101858

一般に、アスファルト混合物は、骨材をドライヤで加熱し、分級・計量し、ミキサに投入したのち、そこに常温のフィラーを投入して混合し、更に、アスファルトを添加して混合することにより製造される。ところが、特許文献1に記載の方法では、フィラーの量が多いので、そのまま混合するとアスファルト混合物の温度が低くなり使用することができない。アスファルト混合物の温度を確保する方法としては、フィラーを骨材と共にドライヤで加熱することが考えられるが、フィラーは0.3mm以下と小さいので、ドライヤのパグフィルタに吸い込まれてなくなってしまうために採用できない。   Generally, an asphalt mixture is manufactured by heating aggregates with a dryer, classifying and weighing them, putting them into a mixer, adding fillers at room temperature, mixing them, and then adding and mixing asphalt. The However, in the method described in Patent Document 1, since the amount of the filler is large, if it is mixed as it is, the temperature of the asphalt mixture becomes low and cannot be used. As a method of ensuring the temperature of the asphalt mixture, it is conceivable to heat the filler together with the aggregate with a dryer, but the filler is as small as 0.3 mm or less, so it is not absorbed by the pug filter of the dryer. Can not.

そこで、従来は、ドライヤにおける骨材の加熱温度を高くし、ミキサの蓋を開けて人力でフィラーを常温で投入していたが、投入量が多くて大変であり、かつ、危険を伴う。そのため、一度に製造できる量が少なく、大規模補修には不向きであるという問題があった。   Therefore, conventionally, the heating temperature of the aggregate in the dryer is increased, the lid of the mixer is opened, and the filler is manually charged at room temperature. However, the amount of charging is large and serious, and there is a danger. For this reason, there is a problem that the amount that can be manufactured at one time is small and it is not suitable for large-scale repair.

本発明は、このような問題に基づきなされたものであり、安価で大量供給が可能であり、かつ、耐久性を向上させることができる薄層舗装用アスファルト混合物、それを用いた舗装道路の補修方法、及び、それにより補修された舗装道路を提供することを目的とする。   The present invention has been made on the basis of such a problem, and is a low-priced asphalt mixture that can be supplied in large quantities and can improve durability, and repair of a paved road using the same. The object is to provide a method and a paved road repaired thereby.

本発明の薄層舗装用アスファルト混合物は、骨材及びアスファルトを加熱混合して得られるものであって、骨材は、最大粒径が8mm未満であり、その粒度分布は、粒径2.36mm以上8mm未満の粗骨材が65質量%以上80質量%以下の範囲内、粒径0.3mm以上1mm未満の細骨材が5質量%以上25質量%以下の範囲内、粒径0.075mm以上0.3mm未満の細砂及び粒径0.075mm未満の石粉の合計が5質量%以上25質量%以下の範囲内のものである。   The thin pavement asphalt mixture of the present invention is obtained by heating and mixing aggregate and asphalt, and the aggregate has a maximum particle size of less than 8 mm, and its particle size distribution is 2.36 mm. Coarse aggregate having a particle size of not less than 8 mm and in a range of 65% by mass to 80% by mass, Fine aggregate having a particle size of not less than 0.3 mm and less than 1 mm in a range of 5% by mass to 25% by mass, particle size of 0.075 mm The total of fine sand having a particle size of less than 0.3 mm and stone powder having a particle size of less than 0.075 mm is in the range of 5% by mass to 25% by mass.

本発明の舗装路面の補修方法は、本発明の薄層舗装用アスファルト混合物を既設の舗装路面上に舗設して補修するものである。   The method for repairing a paved road surface of the present invention is to repair the asphalt mixture for thin layer paving of the present invention on an existing paved road surface.

本発明の舗装道路は、本発明の薄層舗装用アスファルト混合物を既設の舗装路面上に舗設して補修したものである。   The paved road of the present invention is prepared by paving the asphalt mixture for thin-layer paving of the present invention on an existing paved road surface.

本発明によれば、粒径0.3mm以上1mm未満の細骨材を含むようにしたので、細骨材にフィラーとしての働きをさせることができ、既設の舗装路面に付着する力を強くすることができる。これにより、切削オーバーレイ工法ではなく、オーバーレイ工法で補修することができ、短い工事期間で簡単に工事することができると共に、廃棄物が少なく地球環境の改善にも大きく貢献することができる。また、工事期間が短いので、工事による交通規制の回数や時間を減少させることができ、工事による事故も削減することができる。   According to the present invention, since the fine aggregate having a particle size of 0.3 mm or more and less than 1 mm is included, the fine aggregate can function as a filler, and the force to adhere to the existing pavement surface is increased. be able to. As a result, repair can be performed not by the cutting overlay method but by the overlay method, so that the construction can be easily performed in a short construction period, and the amount of waste is small, which can greatly contribute to the improvement of the global environment. In addition, since the construction period is short, the number and time of traffic regulation due to construction can be reduced, and accidents caused by construction can also be reduced.

また、粒径0.3mm以上1mm未満の細骨材は、粗骨材と共にドライヤで加熱することができるので、既設のプラントを用いて薄層舗装用アスファルト混合物を製造することができる。よって、薄層舗装用アスファルト混合物を安価にかつ大量に供給することができる。従って、補修箇所の外側縁部を十分に広く覆うことができ、補設部分の周縁部から剥がれ、補修箇所が露出してしまうことを抑制することができる。また、広範囲にわたる補修を連続して行うことができ、作業効率を大幅に向上させることができる。更に、安価で大量の予防保全を行うことができるので、舗装道路の寿命を各段に延長させることができる。   Moreover, since the fine aggregate with a particle size of 0.3 mm or more and less than 1 mm can be heated together with the coarse aggregate with a dryer, an asphalt mixture for thin layer pavement can be produced using an existing plant. Therefore, the asphalt mixture for thin layer pavement can be supplied at low cost and in large quantities. Therefore, it is possible to cover the outer edge of the repaired part sufficiently wide, and to prevent the repaired part from being exposed by being peeled off from the peripheral part of the repaired part. Further, a wide range of repairs can be performed continuously, and work efficiency can be greatly improved. Furthermore, since a large amount of preventive maintenance can be performed at low cost, the life of the paved road can be extended to each stage.

更に、粗骨材の最大粒径と最小粒径の差を3.00mm以下とするようにすれば、補修箇所の外側縁部の平坦部分において、粒径が揃った粗骨材同士が互いにかみ合ったような形の薄い粗骨材の層を形成し、上部から加えられた転圧力がどの部分にも均一に加わり、全体を均一な力で固く締め固めることができる。よって、締め固めの弱い部分が形成されないため、アスファルト混合物の割れや剥離飛散を大幅に減少させることができる。   Furthermore, if the difference between the maximum particle size and the minimum particle size of the coarse aggregate is set to 3.00 mm or less, the coarse aggregates having uniform particle sizes mesh with each other in the flat portion of the outer edge of the repaired portion. As a result, a thin coarse aggregate layer is formed, and the rolling force applied from the top is uniformly applied to any part, and the whole can be firmly compacted with a uniform force. Therefore, since the part with weak compaction is not formed, the crack and peeling scattering of an asphalt mixture can be reduced significantly.

本発明の一実施の形態に係る薄層舗装用アスファルト混合物を使用した補修個所の断面図である。It is sectional drawing of the repair location which uses the asphalt mixture for thin-layer pavements which concerns on one embodiment of this invention. 図1の一部を拡大して表す図である。It is a figure which expands and represents a part of FIG.

以下、本発明の実施の形態について図面を参照して詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図1は、本発明の一実施の形態に係る薄層舗装用アスファルト混合物を使用した補修個所の断面図である。図2は、図1の一部を拡大して表すものである。この薄層舗装用アスファルト混合物1は、骨材及びアスファルトを加熱混合して得られるものであり、既設の舗装路面2にできた轍掘れや窪み、及び、主に橋梁伸縮装置部(ジョイント部)に発生する1cmから3cm程度の割れ等の補修箇所3をオーバーレイ工法により補修するのに適したものである。なお、図1は、轍掘れの場合について示している。   FIG. 1 is a cross-sectional view of a repair location using an asphalt mixture for thin pavement according to an embodiment of the present invention. FIG. 2 is an enlarged view of a part of FIG. This thin-layer pavement asphalt mixture 1 is obtained by heating and mixing aggregate and asphalt, and pits and depressions formed on the existing pavement road surface 2 and mainly a bridge expansion and contraction device part (joint part) It is suitable for repairing the repaired part 3 such as a crack of about 1 cm to 3 cm generated by the overlay method. FIG. 1 shows the case of digging.

骨材は、最大粒径が8mm未満であり、その粒度分布は、粒径2.36mm以上8mm未満の粗骨材が65質量%以上80質量%以下の範囲内、粒径0.3mm以上1mm未満の細骨材が5質量%以上25質量%以下の範囲内、粒径0.075mm以上0.3mm未満の細砂及び粒径0.075mm未満の石粉の合計が5質量%以上25質量%以下の範囲内である。このように最大粒径及び粒度分布を調節することにより、補修箇所3に敷設した薄層舗装用アスファルト混合物1を十分に締め固めることができるようにし、既設の舗装路面2に付着する力を強くしたものである。   The aggregate has a maximum particle size of less than 8 mm, and the particle size distribution of the coarse aggregate having a particle size of 2.36 mm or more and less than 8 mm is within the range of 65 mass% or more and 80 mass% or less, and the particle size is 0.3 mm or more and 1 mm. Less than 5% to 25% by mass of fine aggregate less than 5% by mass, fine sand having a particle size of 0.075 mm to less than 0.3 mm and stone powder having a particle size of less than 0.075 mm is 5% by mass to 25% by mass Within the following range. By adjusting the maximum particle size and the particle size distribution in this way, the thin-layer pavement asphalt mixture 1 laid at the repair location 3 can be sufficiently compacted, and the force adhering to the existing pavement road surface 2 is increased. It is a thing.

粒径2.36mm以上8mmmm未満の粗骨材を65質量%以上80質量%以下の範囲内とするのは、粗骨材が少なすぎると、細骨材等が多くなり転圧を十分にできるが強度が弱くなってしまい、また、粗骨材が多すぎると、細骨材等が少なくなることによりアスファルトのコーティング厚みが薄くなり、剥離しやすくなるからである。   The reason why the coarse aggregate having a particle size of 2.36 mm or more and less than 8 mm mm is within the range of 65 mass% or more and 80 mass% or less is that if there are too few coarse aggregates, fine aggregates and the like increase and rolling can be sufficiently performed. This is because the strength becomes weak, and when there is too much coarse aggregate, the fine aggregate and the like are reduced, so that the coating thickness of the asphalt becomes thin and is easily peeled off.

粗骨材の最大粒径と最小粒径の差は3.00mm以下とすることが好ましい。補修箇所3の外側縁部4の平坦部分においては、粒径が揃った粗骨材同士が互いにかみ合ったような形の薄い粗骨材の層が形成され、上部から加えられた転圧力がどの部分にも均一に加わり、全体を均一な力で固く締め固めることができるからである。よって、締め固めの弱い部分が形成されないため、アスファルト混合物の割れや剥離飛散を大幅に減少させることができるからである。   The difference between the maximum particle size and the minimum particle size of the coarse aggregate is preferably 3.00 mm or less. In the flat portion of the outer edge portion 4 of the repair location 3, a thin coarse aggregate layer is formed in such a way that coarse aggregates having a uniform particle size mesh with each other. This is because it can be applied evenly to the part and the whole can be firmly compacted with a uniform force. Therefore, since a weakly compacted portion is not formed, it is possible to significantly reduce the cracking and separation scattering of the asphalt mixture.

粒径0.3mm以上1mm未満の細骨材は、フィラーとしての働きをさせるためのものである。粒径0.3mm未満の細砂は粗骨材と共にドライヤで加熱することが難しいので、粒径0.3mm以上1mm未満の細骨材を用いることにより、既設のプラントで生産することができるようにしたものである。   The fine aggregate having a particle size of 0.3 mm or more and less than 1 mm is intended to function as a filler. Fine sand with a particle size of less than 0.3 mm is difficult to heat with a coarse aggregate with a dryer, so it can be produced at an existing plant by using fine aggregate with a particle size of 0.3 mm or more and less than 1 mm. It is a thing.

骨材における細砂及び石粉の粒度分布は、細砂が0質量%以上17質量%以下の範囲内、石粉が5質量%以上12質量%以下の範囲内であることが好ましい。細砂は、積極的に添加するものではなく、主として、細骨材の原料に含まれている粒径0.3mm未満の細砂のうち、ドライヤのパグフィルタに吸い込まれずに残ったものである。   The particle size distribution of fine sand and stone powder in the aggregate is preferably in the range of 0 to 17% by mass of fine sand and in the range of 5 to 12% by mass of stone powder. Fine sand is not positively added, but is mainly fine sand with a particle size of less than 0.3 mm contained in the raw material of fine aggregate that remains without being sucked into the pug filter of the dryer. .

なお、骨材における粒径1mm以上2.36mm未満の粒度分布は0質量%であることが好ましい。骨材の好ましい粒度分布を表1に示す。   The particle size distribution in the aggregate with a particle size of 1 mm or more and less than 2.36 mm is preferably 0% by mass. Table 1 shows a preferable particle size distribution of the aggregate.

Figure 0006467087
Figure 0006467087

骨材は、例えば、7号砕石と、細目砂と、石粉とを配合することにより得られる。   The aggregate is obtained, for example, by blending No. 7 crushed stone, fine sand, and stone powder.

薄層舗装用アスファルト混合物1におけるアスファルトの配合割合は、例えば、5質量%以上8質量%以下とすることが好ましい。アスファルトの添加率が5質量%より小さいと、アスファルトが全体に十分行き渡らず耐久性が不十分となり、8質量%より大きいと、アスファルト混合物が不均一となりかえって耐久性が低下してしまうからである。   The blending ratio of asphalt in the thin-layer pavement asphalt mixture 1 is preferably 5% by mass or more and 8% by mass or less, for example. If the asphalt addition rate is less than 5% by mass, the asphalt does not spread over the whole and the durability is insufficient, and if it is greater than 8% by mass, the asphalt mixture becomes non-uniform and the durability decreases. .

この薄層舗装用アスファルト混合物1は、例えば、粗骨材及び細骨材の原料をドライヤで加熱し、分級・計量してミキサに投入し、そこに常温の石粉を投入して混合したのち、更に、アスファルトを添加して混合することにより製造することができる。   The asphalt mixture 1 for thin layer pavement is prepared by, for example, heating the raw material of coarse aggregate and fine aggregate with a dryer, classifying and weighing the mixture into a mixer, and then adding and mixing normal temperature stone powder there. Furthermore, it can manufacture by adding and mixing asphalt.

この薄層舗装用アスファルト混合物1は、既設の舗装路面2の補修を行う際に、既設の舗装路面上に舗設して補修することができる。具体的には、まず、補修する補修箇所3を水等でクリーニングした後、補修箇所3及びその外側縁部4を十分に覆うように、薄層舗装用アスファルト混合物1を敷設し、その表面を転圧機等により締固め処理を行う。なお、補修箇所3における薄層舗装用アスファルト混合物1を舗設後の表面高さは既設の舗装路面2の高さよりも高くなるようにすることが好ましく、補修箇所3の外側縁部4において、薄層舗装用アスファルト混合物1を舗設後の表面高さが端部に向かい既設の舗装路面2の高さに近くなるように低くなるようにすることが好ましい。補修箇所3における舗設後の薄層舗装用アスファルト混合物1の厚みは、例えば、1.0cmから5.0cmである。外側縁部4の補修箇所3の側における舗設後の薄層舗装用アスファルト混合物1の厚みは、例えば、粗骨材の最大粒径に等しくなるようにすることが好ましい。   The thin-layer paving asphalt mixture 1 can be repaired by paving on the existing paved road surface when repairing the existing paved road surface 2. Specifically, first, after repairing the repaired portion 3 to be repaired with water or the like, the asphalt mixture 1 for thin layer pavement is laid so as to sufficiently cover the repaired portion 3 and the outer edge 4 thereof, and the surface is covered. The compaction process is performed with a compactor. In addition, it is preferable to make the surface height after paving the asphalt mixture 1 for thin layer pavement at the repair location 3 higher than the height of the existing pavement road surface 2. It is preferable that the surface height after paving the asphalt mixture 1 for layer pavement is lowered so as to be close to the height of the existing paved road surface 2 toward the end. The thickness of the asphalt mixture 1 for thin layer pavement after paving at the repair location 3 is, for example, 1.0 cm to 5.0 cm. It is preferable that the thickness of the asphalt mixture 1 for thin layer pavement after paving on the side of the repair location 3 of the outer edge 4 is equal to the maximum particle size of the coarse aggregate, for example.

このように本実施の形態によれば、粒径0.3mm以上1mm未満の細骨材を含むようにしたので、細骨材にフィラーとしての働きをさせることができ、既設の舗装路面2に付着する力を強くすることができる。これにより、切削オーバーレイ工法ではなく、オーバーレイ工法で補修することができ、短い工事期間で簡単に工事することができると共に、廃棄物が少なく地球環境の改善にも大きく貢献することができる。また、工事期間が短いので、工事による交通規制の回数や時間を減少させることができ、工事による事故も削減することができる。   As described above, according to the present embodiment, since the fine aggregate having a particle size of 0.3 mm or more and less than 1 mm is included, the fine aggregate can function as a filler, and the existing paved road surface 2 can be used. The adhesion force can be strengthened. As a result, repair can be performed not by the cutting overlay method but by the overlay method, so that the construction can be easily performed in a short construction period, and the amount of waste is small, which can greatly contribute to the improvement of the global environment. In addition, since the construction period is short, the number and time of traffic regulation due to construction can be reduced, and accidents caused by construction can also be reduced.

また、粒径0.3mm以上1mm未満の細骨材は、粗骨材と共にドライヤで加熱することができるので、既設のプラントを用いて薄層舗装用アスファルト混合物1を製造することができる。よって、薄層舗装用アスファルト混合物1を安価にかつ大量に供給することができる。従って、補修箇所3の外側縁部4を十分に広く覆うことができ、補設部分の周縁部から剥がれ、補修箇所3が露出してしまうことを抑制することができる。また、広範囲にわたる補修を連続して行うことができ、作業効率を大幅に向上させることができる。更に、安価で大量の予防保全を行うことができるので、舗装道路の寿命を各段に延長させることができる。   Moreover, since the fine aggregate with a particle size of 0.3 mm or more and less than 1 mm can be heated together with the coarse aggregate with a dryer, the asphalt mixture 1 for thin layer pavement can be produced using an existing plant. Therefore, the thin-layer pavement asphalt mixture 1 can be supplied in a large amount at a low cost. Therefore, the outer edge 4 of the repair location 3 can be covered sufficiently wide, and it can be prevented that the repair location 3 is exposed due to peeling from the peripheral edge of the repair portion. Further, a wide range of repairs can be performed continuously, and work efficiency can be greatly improved. Furthermore, since a large amount of preventive maintenance can be performed at low cost, the life of the paved road can be extended to each stage.

更に、粗骨材の最大粒径と最小粒径の差を3.00mm以下とするようにすれば、補修箇所3の外側縁部4の平坦部分において、粒径が揃った粗骨材同士が互いにかみ合ったような形の薄い粗骨材の層を形成し、上部から加えられた転圧力がどの部分にも均一に加わり、全体を均一な力で固く締め固めることができる。よって、締め固めの弱い部分が形成されないため、アスファルト混合物の割れや剥離飛散を大幅に減少させることができる。   Furthermore, if the difference between the maximum particle size and the minimum particle size of the coarse aggregate is set to 3.00 mm or less, the coarse aggregates having the same particle size can be obtained at the flat portion of the outer edge 4 of the repair location 3. A thin coarse aggregate layer shaped like meshing with each other is formed, and the rolling force applied from the top is uniformly applied to any part, and the whole can be firmly compacted with a uniform force. Therefore, since the part with weak compaction is not formed, the crack and peeling scattering of an asphalt mixture can be reduced significantly.

7号砕石と、細目砂と、石粉とを用い、骨材を配合した。配合した骨材について、ふるいを用いて粒度分布を測定したところ、通過質量百分率は表2に示した通りであった。すなわち、粒径2.36mm以上4.75mm未満の粗骨材が69質量%、粒径0.3mm以上1mm未満の細骨材が14.8質量%、粒径0.075mm以上0.3mm未満の細砂が6.6質量%、粒径0.075mm未満の石粉が9.6質量%であった。この骨材93.8質量%とアスファルト6.2質量%とを混合して薄層舗装用アスファルト混合物1を製造した。製造に際しては、粗骨材及び細骨材の原料として、7号砕石と、細目砂とをドライヤで加熱し、分級・計量してミキサに投入し、そこに常温の石粉を投入して混合したのち、更に、アスファルトを添加して混合した。   Aggregate was blended using No. 7 crushed stone, fine sand and stone powder. When the particle size distribution of the blended aggregate was measured using a sieve, the passing mass percentage was as shown in Table 2. That is, 69% by mass of coarse aggregate having a particle size of 2.36 mm or more and less than 4.75 mm, 14.8% by mass of fine aggregate having a particle size of 0.3 mm or more and less than 1 mm, and a particle size of 0.075 mm or more and less than 0.3 mm. The fine sand was 6.6% by mass, and the stone powder having a particle size of less than 0.075 mm was 9.6% by mass. The aggregate 93.8% by mass and asphalt 6.2% by mass were mixed to produce an asphalt mixture 1 for thin layer pavement. During production, No. 7 crushed stone and fine sand as raw materials for coarse and fine aggregates are heated with a dryer, classified and weighed, put into a mixer, and mixed with ordinary temperature stone powder. After that, asphalt was further added and mixed.

Figure 0006467087
Figure 0006467087

得られた薄層舗装用アスファルト混合物1について、締固め温度140℃でマーシャルオートランマを用いて両面で50回突き固めて締固め処理を行い、マーシャル安定度試験(社団法人日本道路協会編「舗装調査・試験法便覧」項目B001)を実施した。また、カンタプロ試験及びラベリング試験も行った。試験結果を基準値と共に表3に示す。   The resulting thin-layer pavement asphalt mixture 1 was compacted 50 times on both sides with a compaction temperature of 140 ° C. using a marshall autoranma, and subjected to a compaction test. "Survey / Test Method Handbook" item B001) was conducted. A cantapro test and a labeling test were also conducted. The test results are shown in Table 3 together with reference values.

Figure 0006467087
Figure 0006467087

表3に示したように、本実施例によれば、基準値を満足しており、十分な実用性を備えていることが分かった。なお、本実施例では、骨材の粒度分布について具体的に例を挙げて説明したが、上記実施の形態において説明した範囲内についても、同様の特性が得られた。   As shown in Table 3, according to the present example, it was found that the reference value was satisfied and sufficient practicality was provided. In the present example, the particle size distribution of the aggregate has been described with a specific example, but similar characteristics were also obtained within the range described in the above embodiment.

また、本実施例の薄層舗装用アスファルト混合物1を用い、本線での試験施工を行った。
(試験施工例1)
延長70m、施工幅0.8〜1.2mにわたり補修工事を行った。1年経過後に観察したところ、わずかにクラックが見られたが、既設の舗装路面ほどではなく、走行上も問題がなかった。
(試験施工例2)
延長100m、施工幅0.8〜1.2mにわたり補修工事を行った。1年経過後に観察したところ、目立った損傷はなかった。
Moreover, test construction on the main line was performed using the asphalt mixture 1 for thin layer pavement of the present Example.
(Test construction example 1)
Repair work was performed over an extension of 70 m and a construction width of 0.8 to 1.2 m. When observed after one year, a slight crack was observed, but it was not as bad as the existing paved road surface and there was no problem in running.
(Test construction example 2)
Repair work was performed over an extension of 100m and a construction width of 0.8 to 1.2m. When observed after 1 year, there was no noticeable damage.

これらの試験施工例からも十分に実用性を備えていることが分かった。   From these test construction examples, it was found that they were sufficiently practical.

以上、実施の形態及び実施例を挙げて本発明を説明したが、本発明は上記実施の形態に限定されるものではなく、種々変形可能である。例えば、上記実施の形態では、各構成要素について具体的に説明したが、全ての構成要素を備えていなくてもよく、また、他の構成要素を備えていてもよい。例えば、薄層舗装用アスファルト混合物1は、骨材とアスファルト以外の添加物を含んでいてもよい。   While the present invention has been described with reference to the embodiments and examples, the present invention is not limited to the above embodiments and can be variously modified. For example, in the above embodiment, each component has been specifically described. However, not all the components may be provided, and other components may be provided. For example, the thin-layer pavement asphalt mixture 1 may contain additives other than aggregate and asphalt.

舗装路面の補修に用いることができる。   It can be used to repair paved road surfaces.

1…薄層舗装用アスファルト混合物、2…舗装路面、3…補修箇所、4…外側縁部   DESCRIPTION OF SYMBOLS 1 ... Asphalt mixture for thin-layer pavement, 2 ... Paved road surface, 3 ... Repair place, 4 ... Outer edge

Claims (5)

骨材及びアスファルトを加熱混合して得られ,既設の舗装路面をオーバーレイ工法で補修するための薄層舗装用アスファルト混合物であって、
前記骨材は、最大粒径が8mm未満であり、その粒度分布は、粒径2.36mm以上8mm未満の粗骨材が65質量%以上80質量%以下の範囲内、粒径0.3mm以上1mm未満の細骨材が5質量%以上25質量%以下の範囲内、粒径0.075mm以上0.3mm未満の細砂及び粒径0.075mm未満の石粉の合計が5質量%以上25質量%以下の範囲内、前記細砂が0質量%以上17質量%以下の範囲内、前記石粉が8質量%以上12質量%以下の範囲内である
ことを特徴とする薄層舗装用アスファルト混合物。
A thin-layer pavement asphalt mixture obtained by heating and mixing aggregate and asphalt, and repairing the existing pavement surface by overlay method ,
The aggregate has a maximum particle size of less than 8 mm, and the particle size distribution of the coarse aggregate having a particle size of 2.36 mm or more and less than 8 mm is within a range of 65% by mass or more and 80% by mass or less, and a particle size of 0.3 mm or more. The total of fine aggregate less than 1 mm is 5 mass% or more and 25 mass% or less, the total of fine sand having a particle diameter of 0.075 mm or more and less than 0.3 mm and stone powder having a particle diameter of less than 0.075 mm is 5 mass% or more and 25 mass%. % As a thin layer pavement asphalt mixture , wherein the fine sand is within a range of 0% by mass to 17% by mass and the stone powder is within a range of 8% by mass to 12% by mass .
前記粗骨材は、最大粒径と最小粒径の差が3.00mm以下であることを特徴とする請求項記載の薄層舗装用アスファルト混合物。 The coarse aggregate, thin layer paving asphalt mixture according to claim 1, wherein the difference between the maximum particle size and minimum particle size is equal to or less than 3.00 mm. 前記骨材は、粒径1mm以上2.36mm未満の粒度分布が0質量%であることを特徴とする請求項1又は請求項2記載の薄層舗装用アスファルト混合物。 The asphalt mixture for thin-layer pavement according to claim 1 or 2 , wherein the aggregate has a particle size distribution of 0 mass% with a particle size of 1 mm or more and less than 2.36 mm. 既設の舗装路面をオーバーレイ工法により補修する舗装路面の補修方法であって、
請求項1から請求項のいずれか1に記載の薄層舗装用アスファルト混合物を用い、
前記薄層舗装用アスファルト混合物は、前記粗骨材及び前記細骨材の原料をドライヤで加熱し、分級・計量してミキサに投入し、そこに石粉を投入して混合したのち、アスファルトを添加して混合することにより製造し、
前記薄層舗装用アスファルト混合物を既設の舗装路面上に舗設して補修ずる
ことを特徴とする舗装路面の補修方法。
It is a repair method of a paved road surface that repairs an existing paved road surface by an overlay method,
Using the asphalt mixture for thin layer pavement according to any one of claims 1 to 3 ,
The asphalt mixture for thin layer pavement is prepared by heating the coarse aggregate and the raw material of the fine aggregate with a dryer, classifying and weighing them into a mixer, adding stone powder to the mixer, and then adding asphalt Produced by mixing
A method for repairing a paved road surface, comprising repairing the asphalt mixture for thin layer paving on an existing paved road surface.
請求項1から請求項のいずれか1に記載の薄層舗装用アスファルト混合物を既設の舗装路面上に補設してオーバーレイ工法により補修したことを特徴とする舗装道路。 A paved road characterized in that the asphalt mixture for thin layer pavement according to any one of claims 1 to 3 is supplemented on an existing pavement surface and repaired by an overlay method .
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CN109930462A (en) * 2019-03-06 2019-06-25 浙江工业大学 A kind of quick method for repairing and constructing in old road of polyurethane-modified cement
CN114804756A (en) * 2022-03-18 2022-07-29 广州大学 Continuous-grain-size graded rubber powder concrete and preparation method thereof

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JP2009167644A (en) * 2008-01-12 2009-07-30 Hidenori Shida Pavement road repairing method
JP2015040394A (en) * 2013-08-21 2015-03-02 株式会社Nippo Asphalt mixture, asphalt paving method, and asphalt pavement body

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009167644A (en) * 2008-01-12 2009-07-30 Hidenori Shida Pavement road repairing method
JP2015040394A (en) * 2013-08-21 2015-03-02 株式会社Nippo Asphalt mixture, asphalt paving method, and asphalt pavement body

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109930462A (en) * 2019-03-06 2019-06-25 浙江工业大学 A kind of quick method for repairing and constructing in old road of polyurethane-modified cement
CN114804756A (en) * 2022-03-18 2022-07-29 广州大学 Continuous-grain-size graded rubber powder concrete and preparation method thereof

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