JP7407646B2 - Road surface pavement repair material, method for manufacturing road surface pavement repair material, and road surface pavement repair method - Google Patents

Description

The present invention relates to a road surface pavement repair material for repairing road surfaces paved with asphalt, concrete, etc., a method for manufacturing the road surface pavement repair material, and a road surface pavement repair method.

The roads on which cars and other vehicles drive are paved with asphalt, concrete, etc. Paved roads can crack or break due to new construction or maintenance work such as gas or water pipes, ground deformation due to earthquakes, vibrations caused by automobiles, freezing and thawing due to water intrusion, or aging deterioration. Otherwise, damage such as cave-in may occur. When damage occurs to a road surface, the road surface is temporarily restored or restored using road surface pavement repair materials. Road surface pavement repair materials are required to be flexible enough to withstand the vibrations that the road surface receives, and road surface pavement repair materials that have a flexible binder such as asphalt as the main binder have been used. However, road surface pavement repair materials whose main binder is a flexible binder such as asphalt require heating to melt the asphalt before use (construction), making it easy to construct. It wasn't something. For this reason, road surface pavement repair materials that can be applied even at room temperature have come into use.

As a conventional road surface pavement repair material that can be applied even at room temperature, Patent Document 1 describes a road surface pavement repair material containing asphalt, lubricating oil, slaked lime, steel slag, and aggregate. Patent Document 2 describes a road surface pavement repair material containing asphalt, petroleum lubricating oil, fatty acid, cement, and aggregate. Moreover, Patent Document 3 describes a road surface pavement repair material containing asphalt, a drying oil, a reaction accelerator, and aggregate. These repair materials have a workable viscosity by impregnating asphalt as the main binder with lubricating oil, etc., and harden (highly viscosity) to ensure the physical strength of the repair material.

JP2003-327835A Patent No. 6458194 Japanese Patent Application Publication No. 2018-199779

However, conventional road surface pavement repair materials are so-called moisture-curing repair materials that increase physical strength by reacting hardening accelerators such as slaked lime, cement, or reaction accelerators with moisture (moisture). For this reason, conventional road surface pavement repair materials have had the problem of being unsuitable for long-term storage.

The present invention solves the above-mentioned problems, and aims to provide a road surface pavement repair material that can be stored for a long period of time while having flexibility that can withstand vibrations that the road surface receives.

The road surface pavement repair material according to the present invention is a road surface pavement repair material consisting of countless granules,
The granules are composed of a core aggregate and an adhesive layer made of an adhesive material that covers the aggregate,
The adhesive layer is characterized in that the surface layer is non-adhesive.

According to the road surface pavement repair material of the present invention, since the aggregate has an adhesive layer coated with an adhesive material, by pressing the road surface pavement repair material on the construction site, the adhesive layer of the aggregate can be bonded to the adhesive layer. are adhered to form an integrated repair layer. Since the repair layer is integrated with an adhesive material, it has flexibility that can withstand vibrations experienced by the road surface where the repair layer is applied. In addition, since the surface layer of the adhesive layer is non-adhesive, the road surface pavement repair material will not stick and become integrated unless it is pressed, so it can be stored for a long time. .

Here, in the road surface pavement repair material, the adhesive material may contain a resin composition and asphalt.

According to this, since the asphalt can lower the melting point of the resin composition, excellent manufacturability can be achieved.

Moreover, in the road surface pavement repair material, the surface layer of the adhesive layer may be made non-adhesive by saponified fatty acid.

According to this, the road surface pavement repair material can be stored for a long period of time.

Here, the method for manufacturing a road surface pavement repair material according to the present invention is the method for manufacturing the road surface pavement repair material described above,
a covering step of stirring the aggregate and the adhesive material and coating the aggregate with the adhesive material;
a saponification step of coating a surface layer of an adhesive layer formed by coating the aggregate with the adhesive material, and saponifying the fatty acid using a saponifying agent;
may include.

According to the method for producing a road pavement repair material of the present invention, the road pavement repair material is produced by forming an adhesive layer on aggregate, covering the adhesive material, and saponifying the surface layer of the adhesive layer with a fatty acid and a saponifying agent. Can be made sticky. As a result, the road surface pavement repair material can be stored for a long period of time while having flexibility.

Here, in the method for manufacturing a road surface pavement repair material, the adhesive material includes a resin composition and asphalt,
The aggregate may be coated with the adhesive material that has been heated and melted.

According to this, the resin composition and asphalt can be made compatible in a short time by heating and melting, so that it is possible to achieve excellent manufacturability.

Here, the road surface pavement repair method according to the present invention is characterized in that the above-mentioned road surface pavement repair material is filled into the repaired area.

According to the road surface pavement repair method of the present invention, a road surface pavement repair material can be easily applied to road surface pavement.

According to the road surface pavement repair material of the present invention, it can be stored for a long period of time while having flexibility to withstand vibrations that the road surface receives.

Embodiments of the road surface pavement repair material according to the present invention will be described below. The meanings of each term in this specification and claims are as follows.

"%" (in formulation units) means "mass %" unless otherwise specified. "Median particle size" means the median diameter (d50) determined using a JIS standard sieve (JIS Z 8801-1:2019).

The road surface pavement repair material of the embodiment can be used for repairing road surfaces on which automobiles, aircraft, etc. run, floors in factories, and the like. It can also be used for emergency repair of wet, soft ground, smoothing uneven ground, and preventing weeds from growing in walking paths. Road surface pavement repair materials are made up of countless granules that repair road surfaces paved with asphalt, concrete, etc., and are applied (filled) to the repaired area to form an adhesive layer of countless granules of road surface pavement repair materials. The adhesive materials adhere to each other to form an integrated road pavement repair layer.

The road surface pavement repair material is made up of countless granules, and has aggregate as a core and an adhesive layer in which the aggregate is coated with an adhesive material, and the surface layer of the adhesive layer is made non-adhesive. It is something. The adhesive material forming the adhesive layer contains a resin composition and asphalt, and a non-adhesive layer made of saponified fatty acid is formed on the surface layer of the adhesive layer by the fatty acid and the saponification agent. Furthermore, covering the aggregate with an adhesive material is not limited to covering the entire surface of the aggregate with the adhesive material, but it is sufficient if the covered area is 50% or more of the surface area of the aggregate. It is. This is because, as the road surface pavement repair material of the embodiment, the road surface pavement repair materials can be suitably fused together.

The resin composition (rubber) forming the adhesive material can be either natural rubber or synthetic rubber, such as isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene rubber (SBR), Chloroprene rubber (CR), nitrile rubber (NBR), isobutyene/isoprene rubber (butyl rubber) (IIR), ethylene propylene rubber (EPM, EPDM), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM), fluororubber (ACM) ), epichlorohydrin rubber (CO, ECO), urethane rubber (U), silicone rubber (Si, Q), methyl silicone rubber (MQ), vinyl methyl silicone rubber (VMQ), phenyl methyl silicone rubber (PMQ), etc. can be used. Among these, ethylene propylene rubber, styrene-butadiene rubber, and butyl rubber, which have excellent weather resistance and durability, can be preferably used, and butyl rubber, which has excellent durability, can be particularly preferably used. Note that these resin compositions (rubbers) are preferably unvulcanized rubbers that are not vulcanized from the viewpoint of maintaining adhesiveness.

Asphalt is used as a flux to lower the melting point of a resin composition when the resin composition is heated and melted during the production of road surface pavement repair materials. As the asphalt, natural asphalt, petroleum asphalt (straight asphalt, blown asphalt) specified in JIS K 2207:2006, etc. can be used. Among these, blown asphalt is preferably used because it is solid at room temperature and has excellent handling properties. The amount of asphalt added to the resin composition is preferably 10 to 60 parts by mass based on 100 parts by mass of the resin composition. This is because the melting point of the resin composition can be suitably lowered. If the amount of asphalt added is less than 10 parts by mass based on 100 parts by mass of the resin composition, the effect as a fluxing agent will be insufficient, and energy will be required to heat and dissolve the resin composition. There is a risk that it will become an economic problem. On the other hand, if it exceeds 60 parts by mass, the adhesive material becomes hard, the road surface pavement repair materials do not fuse together, the strength of the adhesive layer after construction is not satisfied, and there is a risk that the abrasion resistance due to vehicular traffic may not be satisfied. be. More preferably, the amount of asphalt added to the resin composition is 20 to 50 parts by mass based on 100 parts by mass of the resin composition.

A plasticizer can be added to the resin composition forming the adhesive material. By adding a plasticizer, the road pavement repair material can exhibit the adhesive properties of the adhesive even in low-temperature environments such as winter, and the adhesive layer made of countless granules of adhesive can be bonded to each other. can be adhered to form a repair layer. Furthermore, during the production of road surface pavement repair materials, it acts as a fluxing agent and can lower the melting point of the resin composition. As a plasticizer, a plasticizer suitable for the type of resin composition used as an adhesive can be used, but general-purpose plasticizers include paraffin plasticizers, naphthenic plasticizers, and aliphatic hydrocarbon plasticizers. , aromatic hydrocarbonized water-killed plasticizers, etc. can be used. Commercially available products can be used for these. The amount of plasticizer added to the resin composition is preferably 5 to 60 parts by mass based on 100 parts by mass of the resin composition. This is because the melting point can be lowered when producing a road surface pavement repair material that allows the adhesive to exhibit its adhesive properties even in a low-temperature environment. If the amount of plasticizer added is less than 5 parts by mass per 100 parts by mass of the resin composition, the plasticizing effect will not be achieved and the adhesive layers made of the adhesive material may not stick together in a low-temperature environment. . Furthermore, during the production of road pavement repair materials, there is a possibility that the effect as a flux will not be expressed. On the other hand, if it exceeds 60 parts by mass, the amount of plasticizer added will be excessive, and when the road pavement repair material is filled (applied) into the repaired area and a repair layer of the road pavement repair material is formed, The flexibility of the repair layer becomes obvious and deforms due to the passage of vehicles, and there is a risk that the deformation resistance will not be satisfied. More preferably, the amount of plasticizer added to the resin composition is 10 to 40 parts by mass based on 100 parts by mass of the resin composition.

Fatty acid is an acid that forms a non-adhesive layer that coats the surface of the adhesive coated on the aggregate and makes the surface layer of the adhesive non-adhesive by saponifying the carboxy group with the saponifying agent described below. . Fatty acids can be used regardless of whether they are saturated fatty acids or unsaturated fatty acids. Saturated fatty acids include butyric acid (4:0), valeric acid (5:0), caproic acid (6:0), heptylic acid (7:0), caprylic acid (8:0), and pelargonic acid (9:0). ), capric acid (10:0), lauric acid (12:0), myristic acid (14:0), pentadecylic acid (15:0), palmitic acid (16:0), margaric acid (17:0), Stearic acid (18:0), arachidic acid (20:0), behenic acid (22:0), lignoceric acid (24:0), etc. can be used. Unsaturated fatty acids include palmitoleic acid (16:1 (n-7)), oleic acid (18:1 (n-9)), vaccenic acid (18:1 (n-7)), and linoleic acid (18:2). (n-6)), (9,12,15)-linolenic acid (18:3(n-3)), (6,9,12)-linolenic acid (18:3(n-6)), Rheostearic acid (18:3(n-5)), 8,11-eicosadienoic acid (20:2(n-9)), 5,8,11-eicosatrienoic acid (20:3(n-9)) ), 5,8,11-eicosatetraenoic acid (20:4(n-6)), and the like can be used. Note that the description in parentheses following the name of the fatty acid is the numerical expression (abbreviation name) of the fatty acid. More preferably, saturated fatty acids such as caproic acid (6:0), heptylic acid (7:0), caprylic acid (8:0), pelargonic acid (9:0), and capric acid, which have excellent stability of the non-adhesive layer, are used. acid (10:0), lauric acid (12:0), unsaturated fatty acids, palmitoleic acid (16:1 (n-7)), oleic acid (18:1 (n-9)), vaccenic acid (18 :1(n-7)), linoleic acid (18:2(n-6)), (9,12,15)-linolenic acid (18:3(n-3)), (6,9,12) -Linolenic acid (18:3(n-6)), eleostearic acid (18:3(n-5)) can be used. More preferably, saturated fatty acids are heptylic acid (7:0), caprylic acid (8:0), pelargonic acid (9:0), unsaturated fatty acids are palmitoleic acid (16:1 (n-7)), Oleic acid (18:1(n-9)), vaccenic acid (18:1(n-7)) can be used.

The amount of fatty acid added to the resin composition is preferably 3 to 30 parts by mass based on 100 parts by mass of the resin composition. This is because the surface of the adhesive layer made of the adhesive material of the road surface pavement repair material can be suitably covered. If the amount of fatty acid added is less than 3 parts by mass per 100 parts by mass of the resin composition, the amount of fatty acid will be insufficient for the surface of the adhesive layer made of the adhesive material of the road pavement repair material, and the adhesive layer will deteriorate. There is a possibility that the entire surface cannot be covered. On the other hand, if it exceeds 30 parts by mass, the amount of fatty acid will be excessive with respect to the surface of the adhesive layer made of the adhesive material of the road surface pavement repair material, which may be uneconomical. More preferably, the amount of fatty acid added to the resin composition is 8 to 20 parts by mass based on 100 parts by mass of the resin composition.

The saponifying agent is an alkali-imparting material that saponifies the carboxy groups of fatty acids covering the surface of the adhesive material coated on the aggregate and provides an alkali that makes the surface layer of the adhesive material non-adhesive. By making the surface layer of the adhesive material non-adhesive, the road surface pavement repair material will not stick and become integrated unless it is pressed, making it possible to store it for a long time. It also prevents caking (material sticking and hardening) during storage.

As saponification agents, lithium silicate compounds, sodium hydroxide, sodium carbonate, sodium hydrogen carbonate, sodium oxide, sodium silicate, potassium hydroxide, potassium carbonate, potassium hydrogen carbonate, potassium oxide, potassium silicate, magnesium hydroxide, carbonate Magnesium, magnesium oxide, magnesium silicate, calcium hydroxide, calcium carbonate, calcium oxide, calcium silicate, cement or mixtures thereof can be used. The cements are ordinary Portland cement, early strength Portland cement, ultra early strength Portland cement, medium heat Portland cement, low heat Portland cement, sulfate resistant Portland cement, and blast furnace cement as specified in Portland cement (JIS R 5210:2019). Cement (JIS R 5211:2019), fly ash cement (JIS R 5213:2019), ecocement (JIS R 5214:2019), alumina cement (JIS R 2521:1995), etc. can be used.

The amount of saponifying agent added to the resin composition is preferably 30 to 60 parts by mass based on 100 parts by mass of the resin composition. This is because the surface of the adhesive layer made of the adhesive material of the road pavement repair material can be suitably made non-adhesive. If the amount of saponifying agent added is less than 30 parts by mass per 100 parts by mass of the resin composition, the amount of saponifying agent will be insufficient for the surface of the adhesive layer made of the adhesive material of the road pavement repair material, and the adhesive There is a risk that the entire surface of the layer may not be made non-adhesive, and caking may occur during storage of the road pavement repair material. On the other hand, if it exceeds 60 parts by mass, the amount of saponifying agent becomes excessive with respect to the surface of the adhesive layer made of the adhesive material of the road surface pavement repair material, which may be uneconomical. More preferably, the amount of saponifying agent added to the resin composition is 30 to 50 parts by mass based on 100 parts by mass of the resin composition.

The aggregate is a small body that becomes the core of the road surface pavement repair material, and is coated with an adhesive material to form a granulated body of the road surface pavement repair material. As the aggregate, crushed stone, crushed sand, silica sand, kansui stone (crushed limestone), Cerben (crushed sanitary ware), and combinations thereof can be used. Among these, crushed stone, crushed sand, silica sand, and kansui stone are preferably used because they are inexpensive and easily available.

The particle size (median particle size) of the aggregate is preferably 0.5 to 10 mm. This is because the workability of road surface pavement repair is excellent and the strength of the road surface pavement repair body is excellent. If the particle size of the aggregate is less than 0.5 mm, the strength of the road pavement repair body may be insufficient. On the other hand, if it exceeds 10 mm, the workability of road surface pavement repair may be poor. More preferably, it is 1 to 7 mm.

The amount of aggregate mixed in the adhesive material is preferably 700 to 2200 parts by mass based on 100 parts by mass of the adhesive material. This is because the adhesiveness of the road surface pavement repair material can be suitably exhibited. If the amount of aggregate added is less than 700 parts by mass per 100 parts by mass of adhesive, the amount of adhesive will be excessive relative to the aggregate, and the flexibility of the repair layer formed from the road pavement repair material will be reduced. There is a risk that the deformation resistance will become apparent, deformation due to vehicle traffic, and deformation resistance will not be satisfied. On the other hand, if the amount exceeds 2,200 parts by mass, there will be insufficient adhesive to the aggregate, the road surface pavement repair materials will not fuse together, the strength of the repair layer after construction will not be satisfied, and the abrasion resistance due to vehicle traffic will not be satisfied. may become inferior. More preferably, the amount of aggregate added to the adhesive is 900 to 1,500 parts by mass based on 100 parts by mass of the adhesive. In addition, from the above, the preferable range of the ratio of adhesive to aggregate (adhesive/aggregate) is 4.5 to 14.3%, and the more preferable range is 6.7 to 11.1%. .

In addition to the above-mentioned raw materials, the road surface pavement repair material can contain various additives depending on the purpose. Various additives include anti-algae and anti-mold agents that prevent the growth of mold in road surface pavement repair materials, rust preventive agents that prevent the formation of rust, and fly ash as a fine powder that fills the voids that occur in road surface pavement repair materials. Colorants or pigments that add color to the pavement repair material, such as silica fume, blast furnace slag, limestone, silica sand, and talc, can be used as needed.

Next, a method for manufacturing a road pavement repair material according to an embodiment will be described. The road surface pavement repair material of the embodiment includes a coating step in which aggregate is coated with an adhesive material to form an adhesive layer, and a fatty acid is coated on the surface layer of the adhesive layer after the coating step, and the carboxy groups of the fatty acid are removed by a saponifying agent. It is manufactured through a saponification process.

The first step, the coating step, is a step in which the aggregate is coated with an adhesive material to form an adhesive layer. The adhesive material is made by heating and melting raw materials such as a resin composition, asphalt, and additives such as a plasticizer to form a mixture. The adhesive material is heated and stirred with the aggregate to form an adhesive layer by covering the aggregate.

The temperature set in the melting furnace when heating and melting the raw material of the adhesive material is preferably 200 to 300°C. This is because the raw material of the adhesive material can be efficiently heated and melted. If the set temperature of the melting furnace is less than 200° C., melting may take a long time and production efficiency may be poor. On the other hand, if the temperature exceeds 300°C, there is a risk that the resin composition will deteriorate and the adhesive material will change in quality. More preferably, the set temperature of the melting furnace during heating and melting is 200 to 250°C, even more preferably 200 to 230°C.

The heated and melted adhesive material is mixed and stirred with the aggregate, thereby covering the aggregate and forming an adhesive layer. A paddle mixer is used for stirring, and as the stirring continues, the adhesive and aggregate are cooled. Stirring is continued until the next saponification step.

The saponification step is a step in which the surface layer of the adhesive layer in which the aggregate is coated with the adhesive material is coated with a fatty acid, and the carboxy groups of the fatty acid are saponified by the saponification agent.

In the saponification step, first, fatty acids are sprinkled onto the aggregate on which the adhesive layer is formed while stirring, so that the surface layer of the adhesive layer is coated with the fatty acid. The fatty acid dispersed on the surface layer of the adhesive layer coats the surface layer of the adhesive layer with the hydrocarbon group side being compatible with the adhesive layer, which is the adhesive material, and the carboxy group side oriented toward the surface layer side of the adhesive layer. In addition, the aggregate (and adhesive layer) at the time of dispersing the fatty acid is cooled to 60° C. or lower. This is to prevent thermal decomposition of fatty acids.

Next, a saponifying agent is sprayed onto the adhesive layer coated with the fatty acid while continuously stirring to saponify the carboxy groups of the fatty acid. By saponifying the carboxy group of the fatty acid, a non-adhesive layer is formed on the surface layer of the adhesive layer made of the adhesive material, which has lost its tackiness.

Since the surface layer of the road surface pavement repair material has lost its adhesion, the road surface pavement repair materials do not stick together and become integrated unless pressed. On the other hand, when cracks occur in the non-adhesive layer due to pressure, adhesive material appears on the surface of the road pavement repair material, and the road surface pavement repair materials become in a state where they can stick together and become one piece. .

The road pavement repair material is completed by forming a non-adhesive layer on the surface layer. The road surface pavement repair material is packed in a bag or the like and shipped to a construction company that installs the road surface pavement repair material. After shipping, the road pavement repair material will not stick and become one piece (caking) unless it is pressed, so it can be stored for a long time.

Next, a road surface pavement repair method according to an embodiment will be described. The road surface pavement repair method of the embodiment includes filling the road surface pavement repair material of the embodiment into damaged areas such as cracks, defects, and depressions that occur on the road surface, and repairing the road surface by filling the road surface pavement repair material with the feet of a worker, a rolling machine, etc. This is to press the repair material.

When the road pavement repair material is pressed by a worker's foot or a rolling machine, cracks occur in the non-adhesive layer, adhesive material appears on the surface of the road pavement repair material, and each road pavement repair material becomes sticky. Then, they are integrated in the shape of the damaged area (filling shape), and a road surface pavement repair layer in which the damaged area is repaired is formed. Since the formed road surface pavement repair layer is integrated with an adhesive material, it has flexibility that can withstand the vibrations that the road surface, which is the construction site, is subjected to.

In addition, the road surface pavement repair material of the embodiment can be implemented even if its structure is changed to the following form.

In the road pavement repair material of the embodiment, the surface layer of the adhesive layer is made non-adhesive by saponified fatty acid, but non-adhesive is made by using silica sand powder, limestone powder, etc. that passes 75 μm (JIS Z 8801-1), for example. It is also possible to make the adhesive layer non-adhesive by coating the surface layer of the adhesive layer with fine particles. In this case, the temperature of the aggregate and adhesive layer during coating with the fine particles is preferably a high temperature (for example, 100° C. or higher). This is because the adhesive material forming the adhesive layer has high tackiness, making it easier for the fine particles to coat the surface layer of the adhesive layer.

Moreover, non-adhesion can also be achieved by coating the surface layer of the adhesive layer with a resin paint. In this case, the resin coating preferably has a Tg (glass transition temperature) of 80° C. or higher. This is because caking can be suitably prevented. As resin paints with a Tg of 80°C or higher, use vinyl chloride resin paints (Tg: 87°C), methyl methacrylate resin paints (Tg: 90°C), styrene resin paints (Tg: 100°C), etc. Can be done.

Hereinafter, the present invention will be explained in more detail with reference to Examples. Note that Test Examples 1 to 48 are Examples, and Test Example 49 is a Comparative Example. The composition etc. of the road surface pavement repair material and the performance evaluation results are listed in Tables 1 to 4, respectively. The composition of the road pavement repair material was described in terms of mass ratio.

表中の原材料の名称には記号を用いた。使用した記号を括弧書きに一般名称又は原材料名を添えて以下に記載する。

Symbols are used for the names of raw materials in the table. The symbols used are listed below in parentheses along with the general name or raw material name.

Crushed stone (crushed stone No. 7 (particle size (median particle size: 5 mm)))
Crushed sand (crushed sand (particle size (median particle size: 2mm)))
BT (butyl rubber resin composition (unvulcanized))
SB (Styrene butadiene rubber resin composition (unvulcanized))
EP (ethylene propylene rubber resin composition (unvulcanized))
BRA (Blown Asphalt 10-20)
BRB (Blown Asphalt 30-40)
KA (paraffin plasticizer)
KB (naphthenic plasticizer)
KC (aromatic hydrocarbon plasticizer)
SO (fatty acid (oleic acid))
SK (fatty acid (caprylic acid))
ANC (Saponification agent (ordinary Portland cement))
ABC (saponification material (blast furnace cement type B))
TA (other additives (pigments, finely powdered fly ash, etc.))
Commercially available products were used for these.

The road pavement repair materials of these test examples were tested for the following evaluation items. In addition, the evaluation "x" in the test of the evaluation items described below only indicates that some of the evaluation items are not satisfied, and does not mean that it is excluded from the examples.

(1) Dissolution time Dissolution time is the time required for adhesive raw materials (resin composition, asphalt, plasticizer) to dissolve to become an adhesive, as an efficiency evaluation during manufacturing. The measurement was performed by using a rubber melting furnace mixer with a capacity of 750 L, and measuring the time required until 500 kg of adhesive raw material was melted without unevenness. The dissolution time was evaluated as ◯ if it was within 3 hours, △ if it was over 3 hours and within 5 hours, and × if it was over 5 hours.

(2) Kneading time The kneading time is the time required for the adhesive material to cover the aggregate (crushed stone, crushed sand) as an efficiency evaluation during production. The measurement was carried out using a paddle mixer (300L horizontal biaxial forced mixing mixer), using a specified amount of adhesive for 200 kg of aggregate, and measuring the time required to uniformly coat 200 kg of aggregate. The kneading time was evaluated as ◯ if it was within 1 minute, △ if it was more than 1 minute and within 3 minutes, and × if it was more than 3 minutes.

(3) Abrasion resistance Abrasion resistance is the abrasion resistance of the repair layer made of the applied road pavement repair material to the passage of vehicles such as automobiles, as a performance evaluation of the product. In the construction of the road surface pavement repair material of the test example, a concave part with a diameter of 60 cm and a depth of 5 cm was formed on the asphalt pavement, and the height of the construction surface was 1 cm from the asphalt pavement by using the road surface pavement repair material of the test example in the repair area. The filling was filled so that it rose to a certain extent, and an adult male weighing 60 kg pressed it 200 times with his foot. In addition, regarding the other company's product in Test Example 49, the standard construction was followed. The test was conducted by allowing vehicles such as cars to pass naturally on general roads in Akechi-cho, Kasugai City, Aichi Prefecture for 90 days. For evaluation, the wear loss was measured from images taken before and after the test from a fixed point. The abrasion loss was evaluated as ○ if it was within 10% of the amount of the applied road surface pavement repair material, △ if it was more than 10% and within 30%, and × if it was more than 30%.

(4) Deformation Resistance Deformation resistance is the resistance to deformation of the repair layer made of the applied road pavement repair material against the passage of vehicles such as automobiles, as a performance evaluation of the product. The construction and testing of the road surface pavement repair material in the test example was the same as for the abrasion resistance described above. For evaluation, the height and shape of weight loss were measured from images taken before and after the test from a fixed point. Then, if the height and shape of the weight loss is within 3 mm and no major deformation abnormality is observed, ○, and if the weight loss is more than 3 mm and within 5 mm and no major deformation abnormality is observed, △ is 5 mm. Those in which the deformation abnormality exceeded or a large deformation abnormality was observed were evaluated as ×.

(5) Caking after long-term storage Caking after long-term storage refers to the state of caking (materials stick together and harden) during storage, as an evaluation of product storage. For the measurement, the road surface pavement repair material of the test example was stored naturally in a covered warehouse for one year in a packaged state, and the packaged product was opened to check its condition. The road pavement repair material does not have hardened clumps caused by materials sticking to each other, and there is no problem during construction. It was evaluated as △, and the case where a lump that could not be easily broken was formed was evaluated as ×.

(6) Caking after opening Caking after opening is the caking state of the opened road pavement repair material as an evaluation for product storage. The measurement was carried out by opening the package of the road pavement repair material, leaving the package unsealed for one day, then repacking the road surface pavement repair material in the package, and storing it in a covered warehouse. After being stored naturally for 90 days, the package was opened and its condition was confirmed. The road pavement repair material does not have hardened clumps caused by materials sticking to each other, and there is no problem during construction. It was evaluated as △, and the case where a lump that could not be easily broken was formed was evaluated as ×.

(7) Material costs Material costs were compared by comparing raw material costs for road pavement repair materials. Then, those that were inexpensive in terms of performance were evaluated as ○, those that were equivalent in performance were evaluated as △, and those that were expensive were evaluated as ×.

(Test Example 1 to Test Example 24)
Test Examples 1 to 24 are test examples in a preferable range, and Test Example 1 is a test example in the best mode. These products received excellent evaluations in almost all evaluation items.

(Test Example 25 to Test Example 27)
Test Examples 25 to 27 are test examples in which the content of asphalt is slightly lower than the resin composition (less than 10 parts by mass relative to 100 parts by mass of the resin composition). Since the content of asphalt was rather small, the dissolution time required 5 hours or more, and the production efficiency was somewhat inferior.

(Test Example 28 to Test Example 30)
Test Examples 28 to 30 are test examples in which the content of asphalt is slightly higher than the resin composition (more than 60 parts by mass relative to 100 parts by mass of the resin composition). Since the content of asphalt was somewhat high, the abrasion loss exceeded 30% in the abrasion resistance test, and the performance evaluation was somewhat inferior. In addition, the material cost was high compared to the performance.

(Test Example 31 to Test Example 33)
Test Examples 31 to 33 are test examples in which the content of plasticizer is slightly lower than the resin composition (less than 5 parts by mass relative to 100 parts by mass of the resin composition). Since the content of plasticizer was rather small, the dissolution time required 5 hours or more, and the kneading time exceeded 3 minutes, resulting in a slightly inferior production efficiency.

(Test Example 34 to Test Example 36)
Test Examples 34 to 36 are test examples in which the content of plasticizer is slightly higher than the resin composition (more than 60 parts by mass relative to 100 parts by mass of the resin composition). Due to the slightly high content of plasticizer, large deformation abnormalities were observed in the deformation resistance test, and the performance evaluation was slightly inferior. In addition, the material cost was high compared to the performance.

(Test Example 37 to Test Example 39)
Test Examples 37 to 39 have a slightly lower content of fatty acids and saponifying agents relative to the resin composition (less than 3 parts by mass of fatty acids and less than 30 parts of saponifying agents relative to 100 parts by mass of the resin composition). ) This is a test example. Because the content of fatty acids and saponification agents was somewhat low, in caking tests after long-term storage and after opening, the occurrence of lumps that could not be easily broken was confirmed, and the performance evaluation was slightly inferior.

(Test Example 40 to Test Example 42)
In Test Examples 40 to 42, the content of fatty acids and saponifying agents is slightly higher than that of the resin composition (with respect to 100 parts by mass of the resin composition, the fatty acid exceeds 30 parts by mass, and the saponifying agent exceeds 60 parts by mass). This is a test example. Although there were no problems with production efficiency and performance evaluation, the content of fatty acids and saponification agents was somewhat excessive, so the material cost was high compared to the performance.

(Test Example 43 to Test Example 45)
Test Examples 43 to 45 are test examples in which the ratio of adhesive to aggregate is slightly higher (adhesive/aggregate exceeds 14.3%). Due to the relatively high proportion of adhesive material, large deformation abnormalities were observed in the deformation resistance test, and the performance evaluation was slightly inferior. In addition, the material cost was high compared to the performance.

(Test Example 46 to Test Example 48)
Test Examples 46 to 48 are test examples in which the ratio of adhesive to aggregate is slightly small (adhesive/aggregate less than 4.5%). Since the proportion of adhesive material was rather small, the kneading time exceeded 3 minutes, and the production efficiency was slightly inferior. Furthermore, in the abrasion resistance test, the abrasion loss exceeded 30%, and the performance evaluation was somewhat poor.

(Test Example 49)
In Test Example 49, performance was evaluated using a moisture-curing repair material manufactured by another company. Moisture-curing repair materials made by other companies were found to form unbreakable clumps in caking tests after long-term storage and after opening due to moisture in the air, resulting in inferior performance evaluations. .

Claims (6)

A road pavement repair material consisting of countless granules,
The granules are composed of a core aggregate and an adhesive layer made of an adhesive material that covers the aggregate,
A road pavement repair material characterized in that the surface layer of the adhesive layer is made non-adhesive by saponified fatty acid . The road surface pavement repair material according to claim 1, wherein the adhesive material contains a resin composition and asphalt. The road surface pavement repair material according to claim 2, wherein the resin composition contains a plasticizer. A method for manufacturing a road pavement repair material according to claim 1, comprising:
a covering step of stirring the aggregate and the adhesive material and coating the aggregate with the adhesive material;
a saponification step of coating a surface layer of an adhesive layer formed by coating the aggregate with the adhesive material, and saponifying the fatty acid using a saponifying agent;
A method for producing a road surface pavement repair material, the method comprising: The adhesive material includes a resin composition and asphalt,
5. The method for manufacturing a road pavement repair material according to claim 4, wherein the aggregate is coated with the adhesive material that has been heated and melted. A road pavement repair method comprising filling a repair site with the road pavement repair material according to claim 1.