Container-packed asphalt mixture, method for manufacturing asphalt mixture, and method for manufacturing asphalt-paved road

Abstract

Provided is a container-packed asphalt mixture that is excellent in terms of convenience. The present invention includes: an asphalt main agent, an auxiliary agent, and a container 1. The container 1 includes a main agent storage section 11 and an auxiliary agent storage section 12. The asphalt main agent is stored in the main agent storage section 11, and the auxiliary agent is stored in the auxiliary agent storage section 12. The main agent storage section 11 and the auxiliary agent storage section 12 are separated by a boundary part 14, and the boundary part 14 can be broken by the application of pressure. If the boundary part is broken, the main agent storage section 11 and the auxiliary agent storage section 12 enter into a communicating state, and the asphalt main agent and the auxiliary agent can be mixed.

Description

Container-filled asphalt mixture, method for producing asphalt mixture, and method for producing asphalt paved road

[0001] The present disclosure relates to a container-filled asphalt mixture, a method for producing an asphalt mixture, and a method for producing an asphalt paved road.

[0002] The asphalt mixture used for road paving is heated to a flowable state, transported to the construction site in a flowable state, and constructed in a flowable state. Therefore, the transportation time and the construction time are limited to a short time. On the other hand, Patent Document 1 discloses an asphalt mixture that can be constructed at normal temperature and exhibits high strength at an early stage after construction.

[0003] Japanese Patent Application Laid-Open No. 2010-248472

[0004] Since the asphalt mixture of Patent Document 1 can be constructed at normal temperature, it is more convenient than hot-mix asphalt, but further convenience is required.

[0005] Therefore, an object of the present disclosure is to provide a container-filled asphalt mixture excellent in convenience, a method for producing an asphalt mixture using the same, and a method for producing an asphalt paved road.

[0006] In order to achieve the above object, the container-filled asphalt mixture of the present disclosure includes an asphalt base, an auxiliary agent, and a container. The asphalt base includes asphalt, aggregate, and lipid. The auxiliary agent includes an alkaline additive and an ionizing agent. The ionizing agent can ionize the alkaline additive, and the ionized alkaline additive can saponify the lipid. The container includes a base agent storage part and an auxiliary agent storage part. The asphalt base is stored in the base agent storage part, and the auxiliary agent is stored in the auxiliary agent storage part. The base agent storage part and the auxiliary agent storage part are separated by a boundary part. The boundary part can be damaged by pressurization. When the boundary part is damaged, the base agent storage part and the auxiliary agent storage part are in a communicating state, and the asphalt base and the auxiliary agent can be mixed. It is a container-filled asphalt mixture.

[0007] The present disclosure is a method for producing an asphalt mixture, comprising: a boundary rupture step in which the boundary portion of the container of the container-filled asphalt mixture of the present disclosure is ruptured by pressurization to connect the main component container and the auxiliary component container; and a mixing step in which the asphalt main component and the auxiliary component are mixed in the container with the ruptured boundary portion to produce an asphalt mixture.

[0008] The method for manufacturing an asphalt paved road according to the present disclosure is a method for manufacturing an asphalt paved road, which includes a supply step of supplying the asphalt mixture manufactured by the method for manufacturing an asphalt mixture according to the present disclosure to a paving site by opening a part of the container.

[0009] According to this disclosure, it is possible to provide a container-filled asphalt mixture with excellent convenience, a method for producing an asphalt mixture using the same, and a method for producing an asphalt paved road.

[0010] Figure 1 is a configuration diagram showing an example of a container-filled asphalt mixture according to the present disclosure. Figure 2 is a cross-sectional view showing an example of a container-filled asphalt mixture according to the present disclosure. Figure 3 is a configuration diagram showing an example of a container-filled asphalt mixture according to the present disclosure with a damaged boundary. Figure 4 is a configuration diagram showing an example of a container-filled asphalt mixture according to the present disclosure with an opening formed in the container.

[0011] Next, embodiments of the present disclosure will be described. The present disclosure is not limited to the following embodiments. In the following figures, the same parts are denoted by the same reference numerals. Furthermore, unless otherwise specified, the descriptions of each embodiment can be used interchangeably with those of the others, and unless otherwise specified, the configurations of each embodiment can be combined.

[0012] In the container-filled asphalt mixture of the present disclosure, the alkaline additive may contain calcium hydroxide, and the ionizing agent may contain water. According to this embodiment, the lipids can be saponified in a short time, and as a result, the asphalt mixture can be hardened in a short time.

[0013] In the container-filled asphalt mixture of this disclosure, the lipid may include fatty acids.

[0014] In the container-filled asphalt mixture of the present disclosure, the container may be a bag formed from a resin film, wherein the storage portion of the bag is partitioned by the boundary portion to form the main agent storage portion and the auxiliary agent storage portion, the boundary portion is formed by sealing the resin films forming the bag together, and the seal strength of the boundary portion is lower than that of the portion of the bag other than the boundary portion. In this embodiment, the bag may be formed by sealing the peripheral and boundary portions of two resin films together.

[0015] In the method for producing the asphalt mixture of the present disclosure, the pressurization in the boundary damage step and the mixing in the mixing step may be carried out manually.

[0016] In this disclosure, the asphalt main component includes asphalt, aggregate, and lipids. In this disclosure, the asphalt main component may also include fillers. The fillers may be included in the auxiliary components.

[0017] In this disclosure, the asphalt is not particularly limited and includes, for example, straight asphalt and modified asphalt.

[0018] In this disclosure, the aggregate may be new aggregate or recycled aggregate. Examples of new aggregate include crushed stone, gravel, and sand. Examples of recycled aggregate include recycled aggregate manufactured from construction waste. Examples of construction waste include asphalt pavement waste excavated by road construction, etc., and concrete waste (crushed stone) from demolished buildings.

[0019] Examples of crushed stone include single-sized crushed stone (No. 1 to No. 7), crushed stone run (C-20 to C-40), and graded crushed stone (M-25 to M-40) as specified in JIS A5001:2008. Standard products include crushed stone for concrete as specified in JIS A5005:2020. It is also possible to use non-standard crushed stone similar to these as crushed stone.

[0020] Examples of crushed sand include concrete crushed sand as specified in JIS A5005:2020. It is also possible to use materials that do not meet the specifications of crushed sand as crushed sand.

[0021] Examples of recycled aggregates include concrete recycled aggregates H, M, and L as specified in JIS A5021:2018, JIS A5022:2018, and JIS A5023:2018, respectively. It is also possible to use non-standard recycled aggregates similar to these as recycled aggregates.

[0022] Examples of recycled crushed stone include recycled crushed stone made from recycled crushed stone and graded crushed stone (e.g., RC-40), recycled graded crushed stone (e.g., RM-30), etc.

[0023] Examples of the aforementioned lipids include oils and fats and fatty acids.

[0024] Fats and oils are a general term for fats that are solid at room temperature (e.g., meat fat and lard) and oils that are liquid at room temperature (e.g., corn oil and soybean oil). Fats and oils include fatty acid esters, such as esterified products of glycerol and fatty acids (triglycerides, etc.).

[0025] Examples of fatty acids include saturated fatty acids and unsaturated fatty acids, with examples of saturated fatty acids including branched saturated fatty acids. These fatty acids may be monomers, or polymers such as dimers and trimers. Furthermore, these fatty acids may be mixtures.

[0026] Examples of saturated fatty acids include saturated fatty acids with 6 to 30 carbon atoms, specifically caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, and stearic acid.

[0027] Examples of branched saturated fatty acids include those with 6 to 30 carbon atoms. Examples of branched saturated fatty acids with 6 to 30 carbon atoms include isoheptanoic acid, octic acid, isononanoic acid, isodecylic acid, isotridecylic acid, isopalmitic acid, isostearic acid, and isomistyric acid.

[0028] Examples of unsaturated fatty acids include oleic acid, linoleic acid, linolenic acid, and arachidonic acid.

[0029] Saturated and unsaturated fatty acids may be used individually or as a mixture of two or more types. Furthermore, as fatty acids, for example, mixed oils of biological origin such as tall oil, olive oil, rapeseed oil, soybean oil, corn oil, safflower oil, and fish oil may be used.

[0030] There are no particular restrictions on the mixing ratio of asphalt, aggregate, and oils and fats. The weight ratio of binder B (total of asphalt and oils and fats) to aggregate A (A:B) is, for example, in the range of 90:10 to 97:3, and the weight ratio of asphalt As to oils and fats F (As:F) is, for example, in the range of 10:90 to 80:20.

[0031] In this disclosure, the filler is a fine aggregate, for example, fine particles that pass through a 75 μm sieve. Examples of fillers include limestone and igneous rock powder, slaked lime, cement, and fly ash. The main component of limestone powder is calcium carbonate. The mixing ratio of the filler is not particularly limited, for example, by weight, the ratio of asphalt base material to filler is 100:0 to 90:10.

[0032] The asphalt base can be manufactured, for example, by mixing heated aggregate with heated asphalt in a mixing device, and then adding and mixing lipids (and fillers as needed). The heating temperature of the aggregate is, for example, 100 to 170 degrees Celsius, and the heating temperature of the asphalt is, for example, 130 to 170 degrees Celsius.

[0033] In this disclosure, the auxiliary agent includes an alkaline additive and an ionizing agent. The ionizing agent ionizes the alkaline additive. The ionized alkaline additive saponifies lipids and hardens them. In the case of oils and fats, saponification can occur, for example, with the alkaline additive, as fatty acid glycerol esters (e.g., triglycerides), a reaction that produces an alkali salt of the fatty acid and glycerol. In the case of fatty acids, saponification can occur with the alkaline additive, as fatty acid alkali salt and water. The main component of asphalt containing lipids is in a flowable state, but when the lipids are saponified by the ionized alkaline additive, the fluidity of the asphalt and aggregate is lost and it hardens.

[0034] Examples of alkaline additives include potassium hydroxide, sodium hydroxide, calcium hydroxide, magnesium hydroxide, potassium bicarbonate, and sodium bicarbonate. Alternatively, a mixture such as cement may be used as the alkaline additive. The ionizing agent is not particularly limited as long as it can ionize the alkaline additive; for example, water. The water is not particularly limited and may be, for example, tap water, rainwater, well water, distilled water, or deionized water.

[0035] The form of the aforementioned additive may be, for example, an aqueous solution of the alkaline additive or a dispersion of the alkaline additive in water, or in other words, in the form of water containing an alkaline additive. Specifically, this includes water containing potassium hydroxide, water containing sodium hydroxide, water containing calcium hydroxide, water containing magnesium hydroxide, water containing potassium bicarbonate, water containing sodium bicarbonate, and water containing cement.

[0036] The mixing ratio of the alkaline additive and water is, for example, in the range of 1:0.1 to 1:90 by weight.

[0037] Auxiliary agents can be manufactured, for example, by mixing an alkaline additive with an ionizing agent.

[0038] Next, an example of the container-filled asphalt mixture of this disclosure will be described with reference to Figures 1 to 4.

[0039] Figure 1 is a front view diagram showing an example of a container, and Figure 2 is a longitudinal cross-sectional view of the container (cross-sectional view in the direction I-I in Figure 1). As shown in Figures 1 and 2, the container 1 is a bag made of resin film, and the bag is formed by overlapping two rectangular resin films and sealing their peripheries, with 13 being the periphery seal portion. Inside the container (bag) 1, the resin films are sealed to each other to form a boundary portion 14 (boundary seal portion), and the inside of the bag is partitioned by the boundary portion 14 to form a main agent storage portion 11 (lower side in Figure 1) and an auxiliary agent storage portion 12 (upper side in Figure 1). The positional relationship between the main agent storage portion 11 and the auxiliary agent storage portion 12 is not particularly limited, and they may be arranged upside down in Figure 1. In this disclosure, for example, the main agent storage portion 11 and the auxiliary agent storage portion 12 may each be divided into multiple storage portions.

[0040] The aforementioned resin film may be, for example, a laminated resin film in which a resin film substrate layer and a sealant layer are laminated. Examples of materials for forming the resin film substrate layer include polyester (PET), stretched polypropylene (OPP), and polyamide (PA), and examples of materials for forming the sealant layer include polyolefin, with specific examples being polyethylene (PE) and unstretched polypropylene (CPP). The laminated resin film may also have functional layers such as a gas barrier layer and a light-shielding layer laminated to it. The laminated resin film may be laminated using an adhesive, by heat sealing, or by co-extrusion molding. The thickness of the resin film substrate layer is, for example, in the range of 3 to 200 μm, the thickness of the sealant layer is, for example, in the range of 0.1 to 50 μm, and the thickness of the functional layer is, for example, in the range of 0.01 to 50 μm.

[0041] In the container (bag) 1, the sealing of the peripheral seal portion 13 and the boundary portion 14 can be carried out by, for example, heat sealing by heating, sealing with adhesive, etc. The seal strength of the boundary portion 14 is set lower than, for example, the seal strength of the peripheral seal portion 13. Preferably, the seal strength of the peripheral seal portion 13 is strong enough that the seal does not break during storage, transportation, and manual pressure, while preferably, the seal strength of the boundary portion 14 is strong enough that the seal does not break during storage and transportation, but breaks when manual pressure is applied. The seal strength of the peripheral seal portion 13 is, for example, 40 N / 15 mm or more, for example, 40 to 120 N / 15 mm, for example, 40 to 80 N / 15 mm. The seal strength of the boundary portion 14 is, for example, 5 to 25 N / 15 mm, for example, 10 to 25 N / 15 mm, for example, 10 to 23 N / 15 mm. The sealing strength of the peripheral seal portion 13 and the boundary portion 14 can be measured, for example, in accordance with JIS Z1707, under conditions of a peeling angle of 90 degrees and a tensile speed of 300 mm / min.

[0042] The asphalt main agent and auxiliary agent can be filled into the container (bag) 1, for example, as follows. First, two rectangular resin films are overlapped, and the left and right peripheral seal portions 13 and the boundary portion 14 are sealed to form a bag with top and bottom openings. Then, the auxiliary agent is filled into the auxiliary agent storage portion 12 from the top opening, and the asphalt main agent is filled into the main agent storage portion 11 from the bottom opening. After that, the top and bottom peripheral edges of the bag are sealed to form peripheral seal portions 13, closing the top and bottom openings. Alternatively, two rectangular resin films can be overlapped, and the left, right, and bottom peripheral edges are sealed to form peripheral seal portions 13, forming a bag with an top opening. Then, the asphalt main agent is filled into the main agent storage section 11 through the upper opening, and then the approximate center of the bag is sealed in a linear fashion to form a boundary section 14, after which the auxiliary agent is filled into the auxiliary agent storage section 12 through the upper opening, and then the periphery of the upper opening is sealed to form a periphery seal section 13 and close the bag.

[0043] Next, based on FIGS. 3 and 4, an example of pavement using the container-filled asphalt mixture of the present disclosure will be described. First, as shown in FIG. 3, by applying pressure by hand-pressing the container (bag) 1, the boundary portion 14 is damaged (broken). Then, the main agent storage portion 11 and the auxiliary agent storage portion 12 are in a communicating state. In this state, the container (bag) 1 is kneaded by hand or shaken by hand to mix the asphalt main agent and the auxiliary agent in the container (bag) 1 to produce an asphalt mixture. Then, the lower part of the container (bag 1) is opened with scissors or the like to form an opening 15, and the asphalt mixture is supplied from the opening 15 to the pavement target location. The supplied asphalt mixture is flattened with a roller or a trowel. In the supplied asphalt mixture, the lipid is saponified by the ionized alkaline additive, and as a result, the asphalt mixture hardens and strength is exhibited. Note that the opening at the lower part of the container (bag) 1 may be formed by, for example, previously forming a cut and tearing the resin film by hand from the cut.

[0044] The total amount of the asphalt main agent and the auxiliary agent (the amount of the asphalt mixture) contained in the container is not particularly limited, but is, for example, a portable amount such as 0.5 to 5 kg. If it is a portable amount, for example, patrolmen on highways and general roads can mount the container-filled asphalt mixture of the present disclosure on a monitoring vehicle and repair the repair location on the spot when they find it. Further, the container-filled asphalt mixture of the present disclosure is, for example, stored together with water which is an ionizing agent, so that it is not necessary to separately prepare water during repair, and it is excellent in convenience. Further, the container-filled asphalt mixture of the present disclosure can mix the asphalt main agent and the auxiliary agent in the container, and thus can prevent the hands from getting dirty, and is also excellent in convenience in this respect.

[0045] The container-filled asphalt mixture of the present disclosure stores the asphalt base material and the auxiliary agent in different containers. Therefore, for example, during storage, it is possible to prevent hardening due to the influence of moisture contained in the asphalt and aggregates, and it has the advantage of being able to be stored for a long time. Also, since hardening during storage can be prevented, a highly reactive material such as calcium hydroxide can be adopted as an alkaline additive. For this reason, hardening after construction can also be achieved in a short time.

[0046] (Examples) Next, examples of the present disclosure will be described. The present disclosure is not limited or restricted by the following examples.

[0047] An asphalt base material having the composition shown in Table 1 below was prepared. No. 7 crushed stone: Classified crushed sand according to JIS A5001, Coarse sand, Fine sand: "Fine aggregate" defined in JIS A0203 StAs: Straight asphalt 60 / ∞ Fatty acid: Product No. PM500, manufactured by Miyoshi Oil & Fat Co., Ltd.

[0048] An alkaline additive (ordinary Portland cement) and water were added to the asphalt base material at each blending ratio, and mixed in a bag to produce an asphalt mixture. The produced asphalt mixture was compacted to create test samples (specimens), and the Marshall stability of the test samples was measured. The measurement conditions for the Marshall stability were a curing temperature of 20°C, a curing time of 1 hour, and a test temperature of 20°C. The blending ratios of the alkaline additive and water, and the measurement results of the Marshall stability are shown in Table 2 below. The higher the measured value of the Marshall stability, the more it can be evaluated that the test sample can obtain a stable and high-strength cured product in a short time.

[0049] As shown in Table 2, when the water or the alkaline additive was 0%, the Marshall stability was as low as about 1.0. On the other hand, as shown in Table 2, when the blending ratio of water was 1% or more and the blending ratio of the alkaline additive was 10% or more, a high Marshall stability was obtained, and it was confirmed that the Marshall stability tended to increase as the blending ratio of the alkaline additive increased.

[0050] Although the present disclosure has been described above with reference to embodiments, the present disclosure is not limited to the embodiments described above. Various modifications to the structure and details of the present disclosure are possible, as can be understood by those skilled in the art within the scope of the present disclosure. Furthermore, each embodiment can be combined with other embodiments as appropriate.

[0051] This application claims priority based on Japanese Patent Application No. 2025-005747, filed on 15 January 2025, and incorporates all of its disclosures herein.

[0052] This disclosure provides a convenient container-filled asphalt mixture. According to this disclosure, for example, damaged sections of roads can be easily repaired during routine inspections by road inspectors on expressways and general roads.

[0053] 1 Container (bag) 11 Main ingredient compartment 12 Auxiliary ingredient compartment 13 Peripheral seal 14 Boundary 15 Opening

Claims

1. A container-filled asphalt mixture comprising an asphalt base, an auxiliary agent, and a container, wherein the asphalt base comprises asphalt, aggregate, and lipids, the auxiliary agent comprises an alkaline additive and an ionizing agent, the ionizing agent is capable of ionizing the alkaline additive, and the ionized alkaline additive is capable of saponifying the lipids, the container comprises a base agent storage section and an auxiliary agent storage section, the asphalt base is stored in the base agent storage section, the auxiliary agent is stored in the auxiliary agent storage section, the base agent storage section and the auxiliary agent storage section are separated by a boundary, the boundary is capable of being broken by pressure, and when the boundary is broken, the base agent storage section and the auxiliary agent storage section become in communication and the asphalt base agent and the auxiliary agent can be mixed.

2. The container-filled asphalt mixture according to claim 1, wherein the alkaline additive contains calcium hydroxide and the ionizing agent contains water.

3. The container-filled asphalt mixture according to claim 1, wherein the lipid comprises a fatty acid.

4. The container is a bag formed from a resin film, the storage portion of the bag is partitioned by the boundary portion to form the main agent storage portion and the auxiliary agent storage portion, the boundary portion is formed by sealing the resin films forming the bag together, and the sealing strength of the boundary portion is lower than that of the bag other than the boundary portion, the container-filled asphalt mixture according to claim 1.

5. The container-filled asphalt mixture according to claim 4, wherein the bag is formed by sealing the peripheral and boundary portions of two resin films together.

6. A method for producing an asphalt mixture, comprising: a boundary rupture step in which the boundary portion of the container of the container-filled asphalt mixture according to claim 1 is ruptured by pressurization to connect the main component container and the auxiliary component container; and a mixing step in which the asphalt main component and the auxiliary component are mixed in the container with the ruptured boundary portion to produce an asphalt mixture.

7. The method for producing an asphalt mixture according to claim 6, wherein the pressurization in the boundary damage step and the mixing in the mixing step are performed manually.

8. A method for manufacturing an asphalt paved road, comprising a supply step of supplying an asphalt mixture manufactured by the method for manufacturing an asphalt mixture according to claim 6 to a paving site by opening a part of the container.

Images