JP2018003289A - Foamed asphalt mixture and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the effects of protection against insects, a pleasant aromatic odor and the like over a long period of time by enabling an additive such as an insecticide and an aromatic to be added in an internally dispersed state.SOLUTION: A foamed asphalt mixture 10 is formed in such a manner that foamed asphalt 12 including a large number of microbubbles (air bubbles) 13 in a dispersed manner and aggregate 11 are mixed together. An additive 13a is added into the microbubbles 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a foam door asphalt mixture produced by mixing foam-like foam asphalt and aggregate, and a method for producing the same.

  Conventionally, additives such as insect repellents and fragrances are added to asphalt and asphalt mixtures, etc., and the asphalt mixture after this addition is paved on roads and open spaces, etc., and this pavement obtains insect repellent and fragrance effects, etc. There is. For example, as disclosed in Patent Document 1, there is a technique for obtaining an insect repellent effect by applying cement milk for permeation or a water permeable resin mortar holding an insect repellent component to a surface layer portion of a pavement such as a paved road.

JP 2012-207467 A

  However, as described above, when an insect repellent or fragrance is added to asphalt or asphalt mixture, the insect repellent or fragrance is not uniformly dispersed in the asphalt or asphalt mixture. For this reason, if there is a bias that reduces the distribution of insect repellents and fragrances on the upper surface of the pavement, the repellent and fragrance effects are weak because the amount of the insect repellents and fragrances is less evaporated. Since it evaporates in a short period of time, the insect repellent effect and the aroma effect persistence is shortened. On the other hand, when there is a bias that distributes many insect repellents and fragrances on the upper surface of the pavement, the insect repellent and fragrance effects temporarily increase, but the insect repellent and fragrance biased to the upper surface evaporate in a short period of time. Therefore, there arises a problem that the insect repellent effect and the aroma effect persistence becomes short.

  Similarly, in the technique of Patent Document 1, since the insect repellent component held on the surface layer portion of the pavement is evaporated and removed according to climatic conditions such as wind, rain, and solar heat, the insect repellent effect is exhibited in a short period of time. The problem that it becomes impossible. This problem similarly occurs even when an additive such as a fragrance is used instead of the insect repellent.

  The present invention has been made in view of such a background, and additives such as insect repellents and fragrances can be dispersed and added therein, thereby maintaining the effects of insect repellent and aroma for a long period of time. It is an object of the present invention to provide a foamed asphalt mixture that can be made and a method for producing the same.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a foam door asphalt mixture in which a foam door asphalt containing a large number of bubbles dispersed and an aggregate are mixed, and an additive is added to the bubbles. It is a foam door bitumen mixture characterized by being made.

  According to this configuration, when the form door bituminous mixture (mixture) is laid on a road or a parking lot or the like and paved, the load on the vehicle traveling on the pavement is temporarily applied and the pavement is bent downward, When no load is applied, it returns to its original position with its repulsive force. At this time, the bubbles contained in the mixture which is a paving body rise slightly. In this way, the bubbles rise little by little, and the additive (for example, insect repellent) in the bubbles evaporates when it reaches a vaporizable position. Since bubbles are dispersed and contained in the mixture, the insect repellent is evaporated by reaching the position where the bubbles can be gradually evaporated. For this reason, the evaporation period lasts for a long time, and the insect repellent effect can also last for a long time.

  The invention according to claim 2 is the foam asphalt mixture according to claim 1, wherein the additive is an insect repellent, a fragrance, or a freezing inhibitor.

  According to this configuration, if the additive is an insect repellent, the insect repellent effect can be maintained for a long time, if it is a fragrance, the aroma effect can be maintained for a long time, and if it is a freeze inhibitor, the freeze suppression effect can be maintained for a long time. .

  The invention according to claim 3 is a method for producing a foamed asphalt mixture in which a foamed asphalt mixed with a large number of air bubbles and an aggregate are mixed, and an aqueous solution is produced by dissolving an additive in water; A step of spraying the aqueous solution onto a molten asphalt at a predetermined injection amount and pressure to form foam door asphalt; and mixing the generated foam door bitumen and aggregate to form a foam door bitumen mixture. A method for producing a foam door asphalt mixture.

  According to this method, the aqueous solution is sprayed on the melted asphalt, so that the asphalt is foamed, and the volume of the asphalt is greatly expanded to produce foam door asphalt. For this reason, the foamed asphalt includes small bubbles dispersed by an aqueous solution. The foam door bitumen and the aggregate are mixed to produce a foam door bitumen mixture (mixture), and bubbles are also dispersed in the mixture. Therefore, even when the mixture is laid on a road, for example, and is squeezed with a roller, many bubbles remaining without disappearing are dispersed and included in the pavement made of this mixture. Since the bubbles are formed of an aqueous solution of water and an additive, the additive is added to the bubbles so as to evaporate. Therefore, the same effect as in the first aspect can be obtained.

  According to a fourth aspect of the present invention, there is provided a method for producing a foam door asphalt mixture in which a foam door asphalt containing a large number of air bubbles dispersed therein and an aggregate are mixed, and a liquid additive is applied at a predetermined injection amount and pressure. Performing the steps of: injecting molten asphalt to form foam asphalt; and mixing the generated foam door asphalt and aggregate to produce a foam door asphalt mixture. It is a manufacturing method of a foam door bitumen mixture.

  According to this method, a liquid additive is sprayed onto molten asphalt, whereby the asphalt is foamed, and the volume of the asphalt is greatly expanded to form foam asphalt. This foam asphalt contains small bubbles dispersed by a liquid additive. Therefore, an effect similar to that of the third aspect can be obtained.

  According to the present invention, additives such as insect repellents and fragrances can be dispersed and added to the inside, whereby effects such as insect repellent and fragrance can be maintained for a long time.

(A) is sectional drawing of the foam door bitumen mixture laid in the road which concerns on embodiment of this invention, (b) is an enlarged view in the broken-line frame of (a). It is a figure which shows the structure of the manufacturing apparatus 20 of the foam door bitumen mixture of this embodiment. (A) is sectional drawing of the road by which the foam door bitumen mixture of this embodiment was laid, and a vehicle, (b) is an enlarged view in the broken-line frame of (a). It is sectional drawing for demonstrating the operation | movement from which the bent pavement body (mixture) on the road shown in FIG.3 (b) returns by the repulsive force.

Embodiments of the present invention will be described below with reference to the drawings.
<Configuration of Embodiment>
FIG. 1A is a cross-sectional view of a foam door bitumen mixture laid on a road according to an embodiment of the present invention, and FIG. 1B is an enlarged view inside a broken line frame of FIG.

  As shown in FIG. 1 (b), the feature of the foam door bitumen mixture 10 is that a large number of minute bubbles (micro-bubbles) dispersed and contained uniformly in the foam door bitumen 12 mixed with the aggregate 11 such as gravel. (Referred to as “bubble”) 13 is formed by adding additives such as insect repellents, fragrances, and freeze inhibitors.

  The foam door bitumen 12 is foamed asphalt obtained by adding a trace amount of water or water vapor to foamed asphalt heated and melted. When the foam door bitumen 12 is manufactured, its volume instantaneously expands to about 10 to 20 times that of the original asphalt, and a large number of microbubbles 13 are uniformly dispersed therein. A mixture of the foam door bitumen 12 and the aggregate 11 is a foam door bitumen mixture (also referred to as a mixture) 10.

  When the mixture 10 is at room temperature, the foam door asphalt 12 to which the aggregate 11 is bonded returns to substantially the same volume as the original asphalt, but the microbubbles 13 are uniformly dispersed therein. Moreover, the mixture 10 is 5-6 mass% of foam door bitumen components with respect to the mixture total weight, and the water component is formed in the ratio of 2-3 mass% with respect to this foam door bitumen. General asphalt can be mixed with the aggregate 11 in a molten state of about 150 ° C., but the foam asphalt 12 can be mixed with the aggregate 11 at about 120 ° C.

  The mixture 10 is manufactured with the manufacturing apparatus 20 of the mixture 10 shown in FIG. The manufacturing apparatus 20 is disposed in an asphalt tank 21, an injection pump 22, a pipe 23 with a spray nozzle 23 a attached to the tip, an aggregate tank 25, a mixing tank 26, a stirrer 27, and the pipe 23. The injection nozzle 30, a pipe 31 attached to the injection nozzle 30, a solenoid valve 32, a pressurizing pump 33, and a storage tank 34 are provided.

  The asphalt tank 21 has a function of heating and melting the asphalt 12a to a melting temperature of about 150 ° C., storing the asphalt 12a that has become liquid by this melting, and measuring the stored asphalt 12a. The injection pump 22 sucks the measured liquid asphalt 12 a and injects it into the pipe 23. At this time, the injection pump 22 injects the asphalt 12a into the pipe 23 with a predetermined injection amount and pressure necessary for generating foam door asphalt.

  The storage tank 34 stores an aqueous solution 13a in which an evaporable additive such as an insect repellent, a fragrance, or a freezing inhibitor is melted in water. Or the storage tank 34 stores only a liquid additive, when an additive is hard to melt | dissolve in water. Here, the storage tank 34 stores the aqueous solution 13a. The storage tank 34 is communicated with the injection nozzle 30 via a pipe 31 communicated with the through-hole on the bottom surface, and a pressurizing pump 33 and an electromagnetic valve 32 are inserted in the middle of the pipe 31 with a space therebetween. ing. The pressurizing pump 33 sucks the aqueous solution 13a stored in the storage tank 34 when the electromagnetic valve 32 is open, and the aqueous solution 13a is injected from the injection nozzle 30 with a predetermined injection amount and pressure required for foam door asphalt generation. The aqueous solution 13a is pressurized and discharged so that is injected.

  The aggregate tank 25 measures and stores the aggregate 11 such as gravel mixed with the foam door asphalt 12 and stores the aggregate 11 in an amount necessary for forming the mixture 10 from the stored aggregate 11. It has a function of supplying to the mixing tank 26 from a supply port 25a penetrating the tank bottom.

  From the spray nozzle 23 a, the amount of foam door bitumen 12 necessary for forming the mixture 10 is injected into the mixing tank 26.

  The mixing tank 26 is provided with an agitator 27 having an agitation screw therein, and the aggregate 11 supplied from the supply port 25a of the aggregate tank 25, the foam door asphalt 12 sprayed from the spray nozzle 23a, Are mixed with stirring by a stirrer 27. Thereby, the mixture 10 is formed.

<Method for producing foam door bitumen mixture>
The case where the mixture 10 is manufactured with the manufacturing apparatus 20 having the above-described configuration will be described.

  First, the electromagnetic valve 32 is opened, and the aqueous solution 13a stored in the storage tank 34 is sucked by the pressure pump 33 and discharged while being pressurized. By this discharge, the aqueous solution 13a is injected into the pipe 23 from the injection nozzle 30 with the injection amount and pressure required for generating foam door asphalt. At this time, the liquid asphalt 12 a held at about 150 ° C. in the asphalt tank 21 is injected into the pipe 23 by the injection pump 22 with an injection amount and pressure necessary for generating foam door asphalt. When the aqueous solution 13a is sprayed from the spray nozzle 30 to the sprayed asphalt 12a, the asphalt 12a foams, and the volume of the asphalt 12a expands to about 10 to 20 times to form the foam door bitumen 12.

  The foam door asphalt 12 whose volume is increased by the foaming is sprayed from the spray nozzle 23 a into the mixing tank 26, and at this time, the aggregate 11 is supplied from the aggregate tank 25. The aggregate 11 and the foam door bitumen 12 are stirred and mixed by the stirrer 27 to form the foam door bitumen mixture 10. At the time of mixing, the foamed asphalt 12 has a large volume as described above, so that the fluidity is improved and the foamed asphalt 12 can be easily mixed with the aggregate 11. Can be formed.

  Further, the foam door bitumen 12 includes a large number of microbubbles uniformly dispersed therein when foamed and increased in volume as described above. For this reason, as shown in FIG. 1 (b), the foam door bitumen 12 is mixed with the aggregate 11 to become the mixture 10, and even when this mixture 10 is laid on the road and pressed by the rollers, it disappears. Many remaining microbubbles 13 are uniformly dispersed and included. Since the microbubble 13 is formed of an aqueous solution 13a of water and an additive, the additive is added inside the microbubble.

  For this reason, as shown in FIG. 3A, when the vehicle 30 travels on the pavement with the mixture 10, as shown by the arrow Y1 in FIG. 3B in which the inside of the broken line frame in FIG. 3A is enlarged. Moreover, the load of the wheel 31 of the car 30 is applied on the pavement, and the pavement bends downward. Thereafter, when the vehicle 30 is moved by running, as shown by an arrow Y2 in FIG. 4, the pavement portion bent downward (see FIG. 3B) is moved upward by the repulsive force corresponding to the bending. Return to position. At this time, due to the upward repulsive force, the microbubbles 13 in the foam door asphalt 12 are slightly raised as shown by the arrow Y2a. Such an operation occurs as follows.

  Since the microbubbles 13 existing in the foam door asphalt 12 of the mixture 10 on the pavement upper surface side have an additive (for example, an insect repellent) added therein, the insect repellent gradually enters the space on the pavement. Evaporates to provide insect repellent effect. At this time, many of the microbubbles 13 at a deep position lowered from the pavement upper surface cannot evaporate due to the weight pressure of the mixture 10 on the upper side. However, as described above, when the microbubbles 13 are slightly raised by the upward repulsive force and reach the position where evaporation is possible, the insect repellent in the microbubbles 13 evaporates.

  Since the microbubbles 13 are uniformly dispersed in the foamed asphalt 12 of the mixture 10, the microbubbles 13 gradually rise and evaporate as the layer of the mixture 10 is thicker as described above. .

<Effect of embodiment>
The foam door bitumen mixture 10 of the embodiment described above is formed by mixing the foam door bitumen 12 and the aggregate 11 containing a large number of microbubbles (bubbles) 13 dispersed therein, and is added to the microbubbles 13. The agent 13a is added.

  According to this configuration, when the mixture 10 is paved by laying on a road or a parking lot, the load of the vehicle traveling on the pavement is temporarily applied, the pavement is bent downward, and no load is applied. At the same time, it returns to its original position by the repulsive force of the bending. At this time, the microbubbles 13 contained in the mixture 10 that is a pavement slightly rise. Thus, when the microbubble 13 rises little by little and comes to the position which can be evaporated, the additive 13a in the microbubble 13 will evaporate. Since the microbubbles 13 are uniformly dispersed in the mixture 10, the microbubbles 13 reach a position where the microbubbles 13 can be evaporated little by little, whereby the period during which the additive 13 a evaporates lasts for a long time.

Moreover, said additive is an insect repellent, a fragrance | flavor, or a freezing inhibitor.
That is, if the additive is an insect repellent, the insect repellent effect can be maintained for a long time, if it is a fragrance, the aroma effect can be maintained for a long time, and if it is a freeze inhibitor, the freeze suppression effect can be maintained for a long time.

  In addition, the method for producing the foamed asphalt mixture 10 of the present embodiment includes a step of dissolving the additive in water to form the aqueous solution 13a, and the aqueous solution 13a to the molten asphalt 12a with a predetermined injection amount and pressure. The step of generating foam door bitumen 12 by spraying and the step of producing the foam door bitumen mixture 10 by mixing the generated foam door bitumen 12 and the aggregate 11 were performed.

  According to this method, the aqueous solution 13a is sprayed onto the molten asphalt 12a, whereby the asphalt 12a is foamed, and the volume of the asphalt 12a is greatly expanded to form the foam door asphalt 12. For this reason, the foamed asphalt 12 contains small microbubbles 13 made of the aqueous solution 13a in a uniformly dispersed state. The foam door bitumen 12 and the aggregate 11 are mixed to produce a mixture 10, and the microbubbles 13 are uniformly dispersed in the mixture 10.

  Therefore, even when the mixture 10 is laid on a road, for example, and is squeezed with a roller, the pavement made of this mixture 10 contains a large number of microbubbles 13 remaining without being evenly dispersed. become. Since the microbubbles 13 are formed of an aqueous solution 13a of water and additives, an additive that can be evaporated is added to the microbubbles 13. Therefore, as described above, the period during which the additive 13a evaporates can be maintained for a long time.

In the above-described method, a liquid additive may be used instead of the aqueous solution.
As a result, the liquid additive is sprayed onto the melted asphalt 12a, whereby the asphalt 12a is foamed, and the volume of the asphalt is greatly expanded to form the foam door asphalt 12. This foam asphalt 12 contains microbubbles 13 dispersed in a liquid additive. Therefore, the same effect as the method described above can be obtained.

  As mentioned above, although embodiment of this invention was described in detail with reference to drawings, this invention is not limited to this, In the range which does not deviate from the main point of invention, it can change suitably.

10 Foam door bituminous mixture 11 Aggregate 12 Foam door bitumen 12a Asphalt 13 Air bubbles (microbubbles)
13a Aqueous solution 20 Production device 21 Asphalt tank 22 Injection pump 23a Spray nozzle 23, 31 Pipe 25 Aggregate tank 26 Mixing tank 27 Stirrer 30 Injection nozzle 32 Solenoid valve 33 Pressure pump 34 Storage tank

Claims (4)

In the foam door asphalt mixture in which the foam door asphalt containing a large number of air bubbles and the aggregate are mixed,
A foam door bitumen mixture, wherein an additive is added to the bubbles.   The foamed asphalt mixture according to claim 1, wherein the additive is an insect repellent, a fragrance, or a freezing inhibitor. In a method for producing a foam door asphalt mixture in which a foam door asphalt containing a large number of air bubbles and an aggregate are mixed,
Dissolving an additive in water to produce an aqueous solution;
Injecting the aqueous solution at a predetermined injection amount and pressure onto molten asphalt to form foam asphalt;
A method of producing a foam door bitumen mixture, comprising: mixing the generated foam door bitumen and the aggregate to produce a foam door bitumen mixture. In a method for producing a foam door asphalt mixture in which a foam door asphalt containing a large number of air bubbles and an aggregate are mixed,
Injecting liquid additive into molten asphalt at a predetermined injection amount and pressure to produce foamed asphalt;
A method of producing a foam door bitumen mixture, comprising: mixing the generated foam door bitumen and the aggregate to produce a foam door bitumen mixture.

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