CN113227499A

CN113227499A - Normal temperature mixture

Info

Publication number: CN113227499A
Application number: CN201980085518.0A
Authority: CN
Inventors: 高村信昭; 千叶国广; 大友信之; 泽口实
Original assignee: Japan Dacheng Road Technology Co ltd
Current assignee: Japan Dacheng Road Technology Co ltd; Taisei Rotec Corp
Priority date: 2018-12-25
Filing date: 2019-12-11
Publication date: 2021-08-06
Also published as: JPWO2020137555A1; WO2020137555A1; JP6893291B6; JP6893291B2

Abstract

Provided is a normal-temperature mix that can adjust the curing time of an asphalt mixture to a desired time. The normal temperature mixture (1) capable of being constructed at normal temperature is characterized by comprising: bitumen, fatty acid, and chelating agent to dilute the concentration of the fatty acid. Preferably, the fatty acid is linseed oil fatty acid and the chelating agent is a phosphite. Further, the weight ratio of the weight of the linseed oil fatty acid to the weight of the phosphite ester is preferably 95 to 50: 5 to 50.

Description

Normal temperature mixture

Technical Field

The invention relates to a normal-temperature mixture.

Background

In the conventional road repair, a normal temperature asphalt mixture (normal temperature mix) that can be applied at normal temperature is used in order to repair a damaged portion locally generated. As a conventional normal temperature asphalt mixture, there is a so-called diluted asphalt mixture in which the viscosity of the asphalt mixture is forcibly lowered by using mineral oil or the like. The diluted asphalt mixture is constructed by softening asphalt with a diluent such as mineral oil, and after construction, the diluent is volatilized to express the strength of the asphalt mixture.

However, the diluted asphalt mixture has the following problems: the strength of the mixture after construction is extremely low, and the curing time is prolonged. In order to solve this problem, it is necessary to quickly cure the diluted asphalt mixture after the application, but the mineral oil cannot be cured at normal temperature. Therefore, as a material of a commonly used asphalt mixture, there is an asphalt mixture in which an alkaline additive is added to a fat or a fatty acid to lower the viscosity of asphalt (see patent document 1). The asphalt mixture of patent document 1 is prepared by supplying a curing accelerator to the asphalt mixture during or immediately after the construction to rapidly perform a saponification reaction between an oil or fat or a fatty acid and an alkali component to cure the asphalt mixture, thereby enabling early traffic opening.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 5583978.

Disclosure of Invention

Problems to be solved by the invention

The asphalt mixture of patent document 1 can shorten the curing time, but cannot delay the usable time (curing time of the asphalt mixture) for which the asphalt mixture can be used (traffic opening) to adjust to a desired time.

The present invention has been made in view of these problems, and an object thereof is to provide a normal temperature mix that can adjust the curing time of an asphalt mixture to a desired time.

Means for solving the problems

The present invention for solving the above problems is a room temperature mixture which can be applied at room temperature, comprising: bitumen, fatty acid, and chelating agent to dilute the concentration of the fatty acid.

According to the room-temperature mix having such a configuration, the solidification rate of the asphalt can be reduced by diluting the concentration of the fatty acid by adding the chelating agent, and therefore, the solidification time of the asphalt mixture can be adjusted to a desired time. This makes it possible to adjust the curing time to a time (5 to 25 minutes) suitable for repair work.

The mix at ambient temperature of the present invention is preferably such that the fatty acid is linseed oil fatty acid and the chelating agent is a phosphite. With such a configuration, the curing time of the asphalt mixture can be easily adjusted.

In addition, the weight ratio of the mixing weight of the linseed oil fatty acid to the mixing weight of the phosphite ester in the normal-temperature mixture is preferably 95-50: 5 to 50. With such a configuration, the curing time of the asphalt mixture can be adjusted to a length suitable for the repair work time, and the strength (stability) of the asphalt mixture after curing can be ensured.

Effects of the invention

According to the room-temperature mix material of the present invention, the curing time of the asphalt mixture can be adjusted to a desired time.

Drawings

FIG. 1 is a view showing a procedure of applying an ambient temperature mix according to a first embodiment of the present invention, wherein (a) is a sectional view showing a filling step, (b) is a sectional view showing a watering step, and (c) is a sectional view showing a rolling step.

Fig. 2 is a graph showing the relationship between the mixing of the room-temperature mix and the setting time according to the first embodiment of the present invention.

Fig. 3 is a graph showing the relationship between the mix at room temperature and the stability/fluidity value according to the first embodiment of the present invention.

Fig. 4 is a graph showing the relationship between the mixing of the room-temperature mix and the setting time according to the second embodiment of the present invention.

Fig. 5 is a graph showing the relationship between the mix at room temperature and the stability/fluidity value according to the second embodiment of the present invention.

Fig. 6 is a graph showing the relationship between the mixing of the room-temperature mix and the setting time according to the third embodiment of the present invention.

Fig. 7 is a graph showing the relationship between the mix at room temperature and the stability/fluidity value according to the third embodiment of the present invention.

Detailed Description

An ambient temperature mix according to a first embodiment of the present invention will be described in detail with reference to the drawings. As shown in fig. 1, the room temperature mix 1 according to the present invention is a room temperature mix that can be applied at room temperature, and is used, for example, for repairing a pit 3 formed in an asphalt pavement 2. The room temperature mix 1 includes aggregate, asphalt, fatty acid, a chelating agent, an alkaline material, and other additives.

The aggregate is preferably composed of coarse aggregate, fine aggregate and filler, and has a continuous particle size. The coarse aggregate is a known aggregate such as crushed stone, pebble, gravel, steel slag, or the like. Further, artificial calcined aggregate, calcined foamed aggregate, artificial lightweight aggregate, ceramic particles, corundum, and the like can also be used. The fine aggregate is known aggregate such as natural sand, artificial sand, and stone chips. The filler is stone powder, hydrated lime, cement, recycled dust or fly ash obtained by crushing limestone or other rocks. The maximum particle size of the aggregate is about 2.5mm to 15mm, as appropriate depending on the conditions of use. For example, in the case where pits 3 are shallow or narrow, the maximum particle diameter is 2.5mm, which is a small particle diameter. When the size of pit 3 is not smaller than a predetermined size (size not narrower), the maximum particle diameter is 5 mm. When water permeability is required, the maximum particle diameter is about 15mm, which is a large particle diameter.

The asphalt is composed of, for example, straight-run asphalt or natural asphalt. In the present embodiment, the fatty acid is linseed oil fatty acid. The iodine value of linseed oil fatty acid is in the range of 183-203, and the representative value of linseed oil fatty acid is 185. The chelating agent has a function of extending the curing time, and in the present embodiment, phosphite is used. In the embodiment, the weight ratio of the linseed oil fatty acid to the phosphite ester is 95-50: 5 to 50. The amount of the asphalt is equivalent to the amount of the linseed oil fatty acid and the phosphite (the total amount of the linseed oil fatty acid and the phosphite). By compounding linseed oil fatty acid and phosphite ester with the asphalt, soft asphalt is formed. The penetration degree of the soft asphalt is more than 360, and the soft asphalt is softer than common asphalt.

The penetration was measured using a testing machine based on JIS K2207. Specifically, the length of the needle that has entered a predetermined length of time (5 seconds) is measured in units of 0.1mm for a sample that has been held at a fixed temperature in a constant temperature water bath.

The alkaline material is cement. As such cement, portland cement (JIS R5210-2009), blast furnace cement (JIS R5211-2009), silica cement (JIS R5212-2009), fly ash cement (JIS R5213-2009), eco-cement (JIS R5214-2009), and the like can be used, and in the third embodiment, the mortar is a high-fluidity, super-rapid-hardening, and non-shrinkage mortar described in the JWWA standard. Other additives are composed of iron oxide, a lustering agent, or the like for making the texture of the room-temperature mix similar to that of the heated asphalt mix. The mixture ratio of aggregate, asphalt, linseed oil fatty acid, phosphite ester, cement and other additives is approximately 90: 4: 3: 3: 0.6.

in the production of the room temperature mix 1, after the asphalt is mixed with the aggregate, a mixture obtained by blending the linseed oil fatty acid and the phosphite ester is mixed. Then, a part of the cement and other additives is mixed, and finally the remaining part of the other additives is mixed, thereby completing the room-temperature mixture 1. Further, at the time of mixing, in order to prevent excessive mixing, the mixing time is carefully managed. The room temperature mixture 1 is put into a bag for storage and transportation, and is sold in a state of being stored in the bag.

When the room-temperature mixed material 1 is constructed, a filling step, a watering step, and a rolling step are performed. As shown in fig. 1(a), the filling step is a step of filling the room temperature mix 1 into the pits 3 formed in the asphalt pavement 2. The filling of the room temperature mix 1 is performed manually by an operator from the bag using a shovel or the like. The filling amount of the room temperature mix 1 is set to an amount such that the room temperature mix 1 slightly bulges from the surface of the road surface 2. When there are a plurality of pits 3 to be repaired or when the size is large, filling may be performed not by manual operation but by a heavy machine.

As shown in fig. 1(b), the water spraying step is a step of spraying water to the room-temperature mix 1 filled in the pit 3. The watering is performed manually by the operator using a hydraulic nozzle. The amount of water sprayed was 1.5 liters or more per 20kg of the mass of the room-temperature mix 1.

As shown in fig. 1(c), the rolling step is a step of compressing the sprayed room-temperature mix 1 to be flush with the road surface 2. The rolling is performed by beating the surface of the room temperature mixture 1 with a shovel or with a roller. After the rolling, the room-temperature mix 1 is cured by curing for a predetermined time.

The curing of the room-temperature mixture 1 is performed by binding the cement with the linseed oil fatty acid by sprinkling water, and the linseed oil fatty acid undergoes a saponification reaction with the alkali component of the cement. The room-temperature mix 1 is solidified by the saponification reaction, and therefore, the road surface 2 becomes usable. According to the room-temperature mix 1 having the configuration of the present embodiment, it is found that the mixture is solidified at the latest approximately 12 minutes after the water spraying (see fig. 2).

Next, the results of experiments in which the combination of linseed oil fatty acid and the chelating agent (phosphite) was changed and the curing time was measured are described with reference to fig. 2. In such experiments, the ratio (weight ratio) of linseed oil fatty acid to the chelating agent was set to 100: 0 (linseed oil fatty acid only, no chelating agent), 80: 20 and 50: 50, the time for the mixture to cure at normal temperature was measured. The mixture ratio is 100: 0 hour, the curing time is approximately 3 minutes, and the mixture ratio is 80: at 20, the curing time is approximately 7 minutes, and the mixture ratio is 50: at 50 deg.C, the cure time was approximately 12 minutes. From the above results, it is found that when the blending ratio of the fatty acid chelating agent to the linseed oil is increased, the curing time tends to be increased.

Here, it was found that, when the curing time is too short, the room-temperature mixture is cured before the rolling step is completed. On the other hand, if the curing time is too long, there is a problem that the time (available time) until the traffic is opened becomes long. Further, when a chelating agent (phosphite) is blended in a large amount for the purpose of increasing the usable time, there is a problem that the strength after curing is lowered. Taking all of these into consideration, the curing time is preferably about 5 to 25 minutes, which is a balance between the construction time, the time until the traffic is opened, and the strength (stability) after curing. As in the present embodiment, if the ratio of linseed oil fatty acid to the chelating agent is set to 80: 20, the curing time is 7 minutes, so that the traffic can be opened as early as possible while the construction time of the rolling process is ensured. In addition, if the ratio of the linseed oil fatty acid to the chelating agent is set to be 50: 50 (the weight of the linseed oil fatty acid blended is equivalent to that of the phosphite ester), the curing time is 12 minutes, and thus, the balance of the working time, the time until the traffic is opened, and the strength (stability) after curing can be obtained. The room temperature mix 1 is stored in a state of being put in a bag, but since it contains a chelating agent and is not easily solidified, it is possible to improve storage stability.

Next, referring to fig. 3, the results of experiments in which the stability/flow value was measured while changing the combination of linseed oil fatty acid and the chelating agent (phosphite) will be described. In such experiments, the ratio (weight ratio) of linseed oil fatty acid to the chelating agent was set to 80: 20. 75: 25. 70: 30. 65: 35 and 60: 40, Marshall stability test was performed to calculate the stability/flow value (100 kgf/cm). As a result, it was found that when a chelating agent was added to linseed oil fatty acid, the stability/fluidity value was lowered by increasing the blending ratio of the chelating agent. Since the stability/flow value is low and the deformation following property is high, it is preferable because cracks and scattering are less likely to occur when the composition is applied to road surface repair. That is, as in the present embodiment, the ratio of the linseed oil fatty acid to the chelating agent is set to 95 to 50: by 5 to 50, the required performance (deformation following property or strength (stability)) for each construction site can be satisfied while balancing the construction time and the time until the traffic is opened.

As described above, according to the room-temperature-mixed material 1 of the present embodiment, the chelating agent (phosphite) for diluting the concentration of the fatty acid is mixed with the linseed oil fatty acid, whereby the solidification rate of the asphalt can be reduced. This makes it possible to adjust the curing time of the asphalt mixture to a desired time and also to adjust the strength (stability) after curing.

In the room-temperature mix of the present embodiment, the fatty acid is linseed oil fatty acid, and the chelating agent is phosphite, so that the setting time of the asphalt mixture can be easily adjusted. Further, since the penetration of asphalt is 360 or more, the flow value becomes large (the stability/flow value becomes small), and the following performance against deformation of the existing road surface or the like is improved. Therefore, cracks or dispersion of the asphalt is not easily generated.

In the room-temperature mixture according to the present embodiment, the ratio by weight of the linseed oil fatty acid to the phosphite ester is 95 to 50: 5 to 50, by changing the blending weight ratio, the curing time can be controlled to a time suitable for the construction, and the stability (strength) and the fluidity (deformation following property) can be controlled.

An ambient temperature mix according to a second embodiment of the present invention will be described. In the room-temperature mix according to the second embodiment, rice bran fatty acid is used as the fatty acid. The room temperature mix of the second embodiment is obtained by using rice bran fatty acid as the fatty acid instead of linseed oil fatty acid, as compared with the room temperature mix of the first embodiment. The iodine value of the rice bran fatty acid is in the range of 98-108, and is lower than that of linseed oil fatty acid. The other configurations are the same as those of the first embodiment. The chelating agent is a phosphite as in the first embodiment. In the embodiment, the weight ratio of the rice bran fatty acid to the phosphite ester is 95-55: 5 to 45. The blending weight of the asphalt and the blending weight of the rice bran fatty acid and the phosphite ester (the total weight of the rice bran fatty acid and the phosphite ester) were substantially equal to each other. The soft asphalt is formed by blending rice bran fatty acid and phosphite ester with asphalt. The soft asphalt has a penetration of 360 or more and is very soft as compared with ordinary asphalt.

Next, referring to fig. 4, the results of an experiment in which the setting time was measured while changing the combination of rice bran fatty acid and chelating agent (phosphite) will be described. In such an experiment, the ratio (weight ratio) of rice bran fatty acid to chelating agent was set to 100: 0 (rice bran fatty acids only, no chelating agent), 75: 25 and 65: 35, the time for which the room-temperature mix was cured was measured. The mixture ratio is 100: 0, the curing time is about 3 minutes, and the mixture ratio is 75: 25 and the mixture ratio is 65: at 35, the cure time was approximately 4 minutes. In addition, the mixture ratio is 75: 25 and the mixture ratio is 65: at 35, basically, there is no difference in the figure, but, specifically, the ratio is 65: at 35, the curing time was slightly longer.

From the above results, it is found that when the ratio of the fatty acid chelating agent to the rice bran is increased, the setting time tends to be increased. Therefore, it is found that the curing time can be increased by adding a large amount of the chelating agent. In addition, rice bran fatty acids tend to have a shorter curing time than linseed oil fatty acids. Therefore, the rice bran fatty acid is suitable for a case where a pit to be repaired is small and the construction time is short.

Next, referring to fig. 5, the results of an experiment in which the stability/fluidity values were measured while changing the combination of rice bran fatty acid and chelating agent (phosphite) will be described. In such experiments, the ratio (weight ratio) of linseed oil fatty acid to the chelating agent was set to 85: 15. 80: 20. 75: 25. 70: 30. 65: 35 and 60: 40, Marshall stability test was conducted to calculate the stability/flow value (100 kgf/cm). As a result, it was found that when a chelating agent was added to linseed oil fatty acid, the stability/fluidity value was lowered by increasing the blending ratio of the chelating agent. The rice bran fatty acids are larger than the linseed oil fatty acids for the tendency of decreasing stability/flow values resulting from increasing the complexing ratio of the chelating agent. That is, the rice bran fatty acid has a higher tendency to have higher deformation following property than the linseed oil fatty acid, and has a large action effect of being less likely to cause cracks or scattering in road surface repair.

The normal temperature mixture of the second embodiment can also reduce the solidification rate of asphalt, as in the normal temperature mixture of the first embodiment. This makes it possible to adjust the curing time of the asphalt mixture to a desired time, and to ensure the repair time. Further, the deformation following property of the asphalt mixture can be improved, and cracks and scattering are less likely to occur.

An ambient temperature mix according to a third embodiment of the present invention will be described. In the room-temperature mix according to the third embodiment, a linseed-type vegetable fatty acid (with an iodine value of 170 adjusted) (hereinafter referred to as "vegetable fatty acid") is used as the fatty acid. The room-temperature-mixed material of the third embodiment is a vegetable fatty acid instead of the linseed oil fatty acid, as compared with the room-temperature-mixed material of the first embodiment. The iodine value of the vegetable fatty acid is 170 or more, the representative value is 172, and is slightly lower than that of the linseed oil fatty acid. In the linseed type vegetable fatty acid, a fatty acid mainly composed of linseed oil and a fatty acid containing a small amount of other unsaturated components (a fatty acid mainly composed of rapeseed, corn, and soybean) are mixed, and the lower limit of the iodine value is set to 170. The ratio of the linseed oil fatty acid to other fatty acids is 60-80: 40 to 20. The other configurations are the same as those of the first embodiment. The chelating agent is a phosphite as in the first embodiment. In the embodiment, the weight ratio of the vegetable fatty acid to the phosphite ester is 100-80: 0 to 20. The blending weight of the asphalt and the blending weight of the vegetable fatty acid and the phosphite ester (the total weight of the vegetable fatty acid and the weight of the phosphite ester) are substantially equal to each other. By blending vegetable fatty acid and phosphite with asphalt, soft asphalt is formed. The soft asphalt has a penetration of 360 or more and is very soft as compared with ordinary asphalt.

Next, referring to fig. 6, the results of an experiment in which the curing time was measured while changing the combination of the vegetable fatty acid and the chelating agent (phosphite) will be described. In such an experiment, the ratio (weight ratio) of the plant fatty acid to the chelating agent was set to 100: 0 (vegetable fatty acid only, no chelating agent), 90: 10 and 80: 20, the time for the mixture to cure at room temperature was measured. The mixture ratio is 100: 0 hour, the curing time is about 5 minutes, and the mixture ratio is 90: 10 and the mixture ratio is 80: at 20 deg.f, the cure time was approximately 6 minutes. In addition, the mixture ratio is 90: 10 and the mixture ratio is 80: at 20, basically, there is no difference in the figure, but, specifically, the ratio is 80: at 20, the curing time was slightly longer.

From the above results, it is found that when the blending ratio of the chelating agent to the vegetable fatty acid is increased, the curing time tends to be increased. Therefore, it is found that the curing time can be increased by adding a large amount of the chelating agent. In addition, the vegetable fatty acids tend to have a shorter curing time than the linseed oil fatty acids, and the vegetable fatty acids tend to have a longer curing time than the rice bran fatty acids. Therefore, the vegetable fatty acid exhibits characteristics intermediate between linseed oil fatty acid and rice bran fatty acid and can be used properly according to the construction site.

Next, referring to fig. 7, the results of an experiment in which the stability/flow value was measured while changing the combination of the plant fatty acid and the chelating agent (phosphite) will be described. In such an experiment, the ratio (weight ratio) of the plant fatty acid to the chelating agent was set to 100: 0. 95: 5. 90: 10. 85: 15 and 80: five of 20 were subjected to Marshall stability test, and the stability/flow value (100kgf/cm) was calculated. As a result, it was found that when a chelating agent was added to a vegetable fatty acid, the stability/fluidity value was lowered by increasing the blending ratio of the chelating agent. For the tendency of decreasing the stability/flow value due to increasing the chelating agent compounding ratio, the vegetable fatty acids are larger than the linseed oil fatty acids, but smaller than the rice bran fatty acids. That is, the deformation following property tends to be higher in the vegetable fatty acids than in the linseed oil fatty acids, and the deformation following property tends to be lower in the vegetable fatty acids than in the rice bran fatty acids. For road surface repair, since it is used properly according to each site, it is possible to provide a product more suitable for the site.

The normal-temperature mixed material of the third embodiment can also reduce the solidification rate of asphalt, as in the normal-temperature mixed material of the first embodiment. This makes it possible to adjust the curing time of the asphalt mixture to a desired time, and to ensure the repair time. Further, the deformation following property of the asphalt mixture can be improved, and cracks and scattering are less likely to occur. In addition, the room-temperature mixture according to the third embodiment can reduce white turbidity caused by low-temperature solidification as compared with the first and second embodiments. Thus, when the room temperature mixture is used at low temperatures or in winter in cold regions, the deterioration of workability due to solidification of fatty acids and the inhibition of the reaction (saponification reaction) between acids and alkali components can be prevented. The room-temperature mix of the third embodiment can be produced at a lower cost than the first and second embodiments.

Although the embodiments for carrying out the present invention have been described above, the present invention is not limited to the above embodiments, and design changes can be appropriately made within a range not departing from the gist of the present invention. For example, in the above embodiment, the fatty acid is linseed oil fatty acid, rice bran fatty acid, or vegetable fatty acid, and the chelating agent is phosphite, but the present invention is not limited thereto.

Description of the reference numerals

1 Normal temperature mixture

2 asphalt pavement

3 pit

Claims

1. A normal temperature mixture can be constructed at normal temperature and is characterized in that,

the normal-temperature mixture comprises: bitumen, fatty acid, and chelating agent to dilute the concentration of the fatty acid.

2. The mix for ambient temperatures according to claim 1,

the fatty acid is linseed oil fatty acid and the chelating agent is a phosphite.

3. An ambient mix according to claim 2,

the weight ratio of the compounding weight of the linseed oil fatty acid to the compounding weight of the phosphite ester is 95-50: 5 to 50.

4. The mix for ambient temperatures according to claim 1,

the fatty acid is a vegetable fatty acid of the linseed oil type and the chelating agent is a phosphite.