JP2010229685A - Pavement structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pavement structure preventing a road surface from being flooded when, in particular, localized heavy rainfall such as guerilla heavy rainfall occurs and preventing the occurrence of the heat island phenomenon effectively. <P>SOLUTION: This pavement structure 10 includes a base course layer 20 constituted by placing a mixture 15 containing Shirasu 11, Portland blast furnace slag cement 12, water 13, and an aggregating agent 14 on the ground 16 and solidifying it. The aggregating agent 14 is a high-molecular compound formed by a composite of magnesium salt and polyethylene imine of acrylic acid-dimethyl methacrylate aminoethyl copolymer. In the mixture 15 placed on the ground 16, groups of particles of the Shirasu 11 and the Portland blast furnace slag cement 12 are mutually bonded to form a three-dimensional network structure while being aggregated due to aggregation action of the aggregating agent 14, and water is sucked by or permeates numerous continuous pores existent in the three-dimensional network structure so that the base course layer 20 constituting the pavement structure 10 has excellent water permeability and water retaining property. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a pavement structure using shirasu collected from a formation in which volcanic ejecta are deposited.

  In recent years, various technologies related to rooftop greening of buildings or pavement structures have been proposed in order to suppress the heat island phenomenon that frequently occurs in the city center in summer. The pavement structure which can suppress the temperature rise of the pavement surface by (for example, refer patent document 1) is proposed.

  On the other hand, in recent years, severe torrential rains such as guerrilla heavy rains have occurred frequently in various parts of Japan, and rainwater exceeding the capacity of drainage facilities around buildings has overflowed on roads and flowed into underground passages, etc. Damage has occurred.

JP 2005-180166 A

  Since the pavement structure described in Patent Document 1 has water permeability and water retention, it can absorb and store rainwater that has poured onto the pavement surface, so that rainwater overflows on the road when a large amount of rain falls. Can be prevented. However, in recent years, it may not be possible to cope with the amount of rainwater in the case of particularly heavy torrential rains such as guerrilla heavy rains that have occurred frequently.

  The problem to be solved by the present invention is to provide a pavement structure that can prevent flooding of the road surface during particularly severe torrential rain such as guerrilla heavy rain and is effective in suppressing the heat island phenomenon.

  The pavement structure of the present invention solidifies a mixture containing shirasu, at least one of cement-based solidifying material or blast furnace cement, an aggregating agent, and water directly or indirectly on the ground. It is characterized by comprising a roadbed layer formed in the above manner. Here, shirasu means an off-white sandy substance collected from a formation (for example, shirasu plateau) where volcanic ejecta widely distributed in the southern Kyushu region and the like are deposited. Moreover, direct placement on the ground means that no other pavement layer is interposed between the ground and the roadbed, and placement indirectly on the ground means between the ground and the roadbed. This refers to interposing other pavement material layers.

  With such a configuration, in the mixture containing shirasu, cement-based solidifying material or blast furnace cement, aggregating agent and water, the action of ions contained in the aggregating agent causes shirasu particles and cement-based solidifying material, A aggregate structure in which the particles of the blast furnace cement are three-dimensionally bonded is formed, and continuous voids are generated in the mixture. Therefore, if these mixtures are cast on the ground and solidified, a pavement structure having a roadbed layer having excellent water permeability and water retention can be obtained. Further, since the continuous voids are formed by the shirasu particles having a relatively small specific gravity, the overall porosity is increased, and thus the completed roadbed layer is relatively light. Furthermore, by including grayish white shirasu, the pavement surface (surface of the roadbed layer) expresses the color tone and texture peculiar to shirasu, so the appearance is good and the harmony with the natural environment is also excellent. .

  Shirasu contained in the roadbed layer is the main material that keeps the roadbed layer in a certain shape, and the aggregating agent acts to change the particles of the shirasu and cement-based solidifying material and blast furnace cement into a three-dimensional aggregated structure. The cement-based solidifying material and blast furnace cement act to solidify the aggregate structure in the roadbed layer formed by the aggregate agent to a strength that is not destroyed by external force.

  Further, the pavement structure of the present invention is a mixture of shirasu, at least one of cement-based solidifying material or blast furnace cement, an aggregating agent, at least one of crushed stone / sand sand, and water. It is characterized by being formed and solidified.

  With such a configuration, the crushed stones and pure sand soil are scattered in the aggregate structure formed by shirasu particles, cement-based solidified material and blast furnace cement particles, so the strength of the roadbed layer, especially the compressive strength Can be increased. In addition, the color tone and texture based on crushed stone and pure sand can be expressed on the surface of the roadbed layer.

  If a polymer compound composed of a composite of magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine is used as the aggregating agent, a relatively strong aggregate structure is formed in the roadbed layer. Therefore, excellent water permeability and water retention can be maintained over a long period of time.

  According to the present invention, it is possible to prevent a road surface from being flooded in the case of a particularly severe torrential rain such as a guerrilla heavy rain, and to provide a pavement structure that is also effective in suppressing the heat island phenomenon.

It is a figure which shows the construction procedure of the pavement structure which is embodiment of this invention. It is a vertical sectional view which shows the function of the pavement structure which is embodiment of this invention. It is a vertical sectional view which shows the function of the pavement structure which is embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the shirasu 11, the blast furnace cement 12, and the water 13 are put into a mixer 19 and sufficiently stirred and mixed. The mixer 19 can be a general mixer having a stirring mechanism driven by a motor or an engine. When the shirasu 11 and the blast furnace cement 12 are mixed evenly, the aggregating agent 14 is added, and the mixture 15 is further stirred and kneaded to form a slurry-like mixture 15. When the mixture 15 obtained in this way is placed on the ground 16 and solidified to form the roadbed layer 20, the pavement structure 10 is completed.

  In the mixture 15 placed on the roadbed 16, the slag 11 and the blast furnace cement 12 are bonded together to form a three-dimensional network structure by aggregating action of the aggregating agent 14. To go. In the process of agglomeration, the particles are further joined and connected to form porous coarse particles having large and small continuous voids, which are solidified through a curing process. When the mixture 15 placed on the ground 16 is sufficiently solidified to form the roadbed layer 20, the pavement structure 10 in which the roadbed layer 20 is directly laminated on the ground 16 is completed.

  The roadbed layer 20 constituting the pavement structure 10 formed through the steps shown in FIG. 1 has a three-dimensional network structure inside, and the water is efficiently absorbed by innumerable continuous voids existing in the three-dimensional network structure. Since the function of permeation occurs, it exhibits excellent water permeability and water retention. Further, the roadbed layer 20 has a three-dimensional network structure and has a high porosity, and is therefore relatively lightweight. Furthermore, since the roadbed layer 20 contains the grayish white shirasu 11, it expresses a unique appearance, color tone, and texture that are not found in the conventional pavement structure, so that the appearance is also good.

  As shown in FIG. 2, if the roadbed layer 20 is formed on the ground 16, rainwater or the like poured on the road surface 20 a is quickly absorbed by the roadbed layer 20 and stored in a continuous gap existing in the three-dimensional network structure. Since rainwater that cannot be stored is gradually discharged into the lower ground 16, it is possible to prevent rainwater from accumulating on the road surface 20 a during rainy weather.

  Therefore, even in the case of particularly severe torrential rains such as guerrilla heavy rains that have occurred frequently in recent years, a large amount of rainwater exceeding the capacity of the surrounding drainage facilities overflows on the road surface 20a or flows into underground passages. Can avoid local floods. In the pavement structure 10 shown in FIG. 2, the roadbed layer 20 is formed directly on the ground 16. A pavement layer (for example, a water retaining layer, a reservoir layer, a reinforcing layer, or a slipping layer in the event of an earthquake) is interposed, or another pavement layer (for example, a water permeable layer, a non-slip layer, an impact buffer) on the roadbed layer 20. A layer or the like).

  On the other hand, when the temperature is high such as summer, as shown in FIG. 3, water such as rainwater stored in the roadbed layer 20 of the pavement structure 10 heated by sunlight evaporates from the road surface 20a, Since the heat of vaporization is taken away, the temperature increase of the entire pavement structure 10 including the roadbed layer 20 can be suppressed. For this reason, it becomes possible to suppress the temperature rise in the vicinity of the road structure 10 in summer, which is also effective in preventing the so-called heat island phenomenon.

  Although the Shirasu 11, the blast furnace cement 12 and the aggregating agent 14 used in the manufacturing process shown in FIG. 1 are not particularly limited, in this embodiment, a Shirasu 10 collected from the Shirasu plateau distributed in South Kyushu is used. When blast furnace cement 12 produced by mixing fine powder of blast furnace slag with Portland cement was used, “Product Name: GB-2000” of Global Laboratories Co., Ltd. was used as the aggregating agent 14. The pavement structure 10 provided with the roadbed layer 20 which has a aggregate structure was able to be constructed. “GB-2000” is a polymer compound composed of a composite of a magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine. “GB-2000” can be used as a stock solution or in an aqueous solution.

In the present embodiment, the mixing ratio of each component constituting the mixture 15 shown in FIG. 1 is as follows, but is not limited to this, so the place where the pavement structure 10 is constructed, the maximum predicted rainfall, and the shirasu 11 It can be changed according to the nature of the. Further, instead of the blast furnace cement 12, a cement-based solidified material may be used, or both the blast furnace cement 12 and the cement-based solidified material may be used.
Shirasu 11: per cubic meter Blast Furnace Cement 12: 10-100kg
Aggregating agent 14 (stock solution of GB-2000): 1.5 liters to 2.5 liters Water: appropriate amount (addition amount is adjusted while confirming the hardness and fluidity of the mixture 15)

  On the other hand, as shown in FIG. 1, if the crushed stone 17 or the pure sand soil 18 is mixed when forming the mixture 15, the crushed stone 17 in the aggregate structure formed by the particles of the shirasu 11 and the particles of the blast furnace cement 12. Moreover, since it will be in the state where the true sand soil 18 was scattered, the intensity | strength of the roadbed layer 20, especially compression strength can be raised. Moreover, the color tone and texture based on the crushed stone 17 and the pure sand soil 18 can be expressed on the road surface 20a (the surface of the roadbed layer 20).

  In addition, since the construction method of the pavement structure 10 is not limited to the one shown in FIG. ) Can be used for construction.

  The pavement structure according to the present invention can be widely used as a pavement structure such as a general road such as a roadway and a sidewalk, a garden road, a plaza, and a ground.

DESCRIPTION OF SYMBOLS 10 Pavement structure 11 Shirasu 12 Blast furnace cement 13 Water 14 Aggregating agent 15 Mixture 16 Ground 17 Crushed stone 18 Pure sand 19 Mixer 20 Subbase layer 20a Road surface

Claims (3)

  A roadbed layer formed by solidifying a mixture containing shirasu, at least one of cement-based solidifying material or blast furnace cement, an aggregating agent, and water directly or indirectly on the ground is provided. A pavement structure characterized by that.   A mixture containing Shirasu, at least one of cement-based solidifying material or blast furnace cement, an aggregating agent, at least one of crushed stone and pure sand, and water is directly or indirectly placed on the ground. A pavement structure comprising a roadbed layer formed by solidification.   3. The pavement structure according to claim 1, wherein a polymer compound comprising a composite of a magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine is used as the aggregating agent. .

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