JP2006037571A - Paving structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paving structure having water retaining property and improved durability. <P>SOLUTION: The paving structure 10 comprises a subgrade 12 formed by placing a mixture of soil and stabilizing treatment agent on a ground 11, a roadbed 13 formed by placing a mixture of soil, cement fixation agent, aggregating agent and coal ash on the subgrade 12, and a water retaining asphalt layer 14 formed on the roadbed 13. Water W passing through the water retaining asphalt layer 14 is sucked into the roadbed 13, entered into cavities of the roadbed 13 and held therein. Thus, water permeability and water retaining property are achieved. The subgrade 12 has a tight structure with no water permeability and so the water held in the roadbed 13 is free of permeation into the subgrade 12 when moving downward. The improved durability is therefore developed while preventing the subgrade 12 from being damaged by the water W. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pavement structure having water retention and excellent durability.

  Various technologies have been developed to suppress the heat island phenomenon that occurs in the city center in the summer, and one of them is a pavement technology that alleviates the temperature rise of the pavement surface caused by sunlight. Representative examples of such pavement techniques include drainage asphalt pavement, water retention asphalt pavement, and water permeable water retention type interlocking block pavement.

  For example, as shown in FIG. 3, the conventional water-permeable pavement structure is formed on a road bed 92 formed on the ground 91, a water retention road bed 93 formed on the road bed 92, and a water retention road bed 93. It is comprised with the water-permeable surface layer 94 made.

  On the other hand, as a technique capable of forming a pavement structure that is gentle to pedestrians and excellent in harmony with a natural landscape, there is an earth-based pavement technique having water permeability (for example, see Patent Document 1).

JP 11-247118 A (page 2-5)

  Conventional drainage asphalt pavement, water retentive asphalt pavement and water permeable water retentive interlocking block pavement can obtain a certain effect in terms of alleviating the heat island phenomenon.

  However, as shown in FIG. 3, in the conventional pavement structure 90, moisture W such as rainwater that has fallen on the surface of the water-permeable surface layer 94 that is the pavement surface is sucked downward through the water-permeable surface layer 94. Then, it passes through the roadbed 93 and penetrates to the roadbed 92 below. For this reason, with the passage of time, the roadbed 92 is often gradually damaged by the moisture W, and the durability is poor.

  Such damage to the roadbed due to permeated moisture also occurs in the pavement structure formed by the pavement technique described in Patent Document 1, and thus the durability is insufficient.

  The problem to be solved by the present invention is to provide a pavement structure having water retention and excellent durability.

  The pavement structure of the present invention comprises a road bed formed by placing a mixture of soil and a stabilizing treatment agent on the ground, and a mixture of soil, cement-based solidifying agent, aggregating agent, and coal ash. A roadbed formed by placing on a floor and a water-retaining pavement layer formed on the roadbed are provided.

  When the soil and the stabilizing agent are mixed, a dense structure without gaps is formed by the action of the stabilizing agent, so that an impermeable roadbed is formed on the ground. In addition, when soil, cement-based solidifying agent, aggregating agent, and coal ash are mixed, soil particles, cement-based solidifying agent particles, and coal ash are three-dimensionally aggregated by the action of ions in the aggregating agent. A grain structure is formed, and continuous voids are generated, and these voids are solidified by the cement-based solidifying agent to such an extent that they are not broken by external force, so that a roadbed having both water permeability and water retention is formed. Furthermore, by forming a water-retaining pavement layer on the roadbed, the surface layer portion of the pavement has water retentivity.

  Therefore, water such as rain water that has fallen on the pavement surface is sucked into the water-retaining pavement layer and retained therein, but the water that cannot be retained by the water-retentive pavement layer is placed in the gap in the roadbed below it. Since it permeates and is retained therein, a pavement structure with water retention can be obtained. In addition, the roadbed below the roadbed has a dense structure and is not permeable, and the water retained in the roadbed does not penetrate the roadbed. The floor is not damaged and has excellent durability.

  Furthermore, since the water | moisture content currently hold | maintained at the water-retaining pavement layer takes away heat of vaporization when it evaporates by sunlight, the effect which suppresses the temperature rise of a pavement surface is also exhibited. In this case, if the water content in the water-retaining pavement layer decreases due to evaporation, the water content in the roadbed below it rises and moves into the water-retaining pavement layer, so that water evaporation from the surface of the water-retentive pavement layer continues In addition, the effect of suppressing the temperature rise lasts for a relatively long time.

  Here, it is desirable to use Fe lime as the stabilizing agent. Fe lime is obtained by mixing sewage sludge incinerated ash with a soil stabilizer made of slaked lime and fine powdered iron oxide by-produced at the ironworks. If Fe lime is used, in addition to being able to form an impermeable roadbed, the strength of the roadbed can be increased.

  On the other hand, the water retentive pavement layer is preferably a water retentive asphalt layer or a water retentive interlocking block layer. The water-retaining asphalt layer and water-retaining interlocking block layer have high water-retaining ability, so the effect of suppressing temperature rise due to evaporation lasts for a long time and also has water permeability. In this case, the visibility of the automobile driver at the time of raining is improved and the safety is improved. Moreover, the water retention asphalt layer can be constructed on either a roadway or a sidewalk, and is excellent in workability. On the other hand, the water-retaining interlocking block layer is excellent in scenic properties, and since the removal work and the restoration work after construction are simple, the workability when reconstructing the place where the construction is finished is good.

  In addition, it is desirable to use a layer containing open granulated asphalt as the water retention asphalt layer, whereby excellent water retention can be obtained.

  A roadbed formed by placing a mixture of soil and stabilizing agent on the ground, and a mixture of soil, cement solidifying agent, aggregating agent and coal ash formed on the roadbed. By providing the roadbed and the water-retaining pavement layer formed on the roadbed, it is possible to form a pavement structure having water retention and excellent durability.

  Hereinafter, a pavement structure according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical sectional view showing a pavement structure according to an embodiment of the present invention, and FIG. 2 is a schematic process diagram showing a construction procedure for a road bed constituting the pavement structure shown in FIG.

  As shown in FIG. 1, the pavement structure 10 of this embodiment includes a road bed 12 formed by placing a mixture of soil and a stabilizing treatment agent on a ground 11, soil, a cement-based solidifying agent, and a group. A roadbed 13 formed by placing a mixture of a granulating agent and coal ash on the roadbed 12 and a water retention asphalt layer 14 formed on the roadbed 13 are provided.

  When a mixture of soil and the stabilizing agent is placed on the ground 11, a dense structure without gaps is formed in the mixture by the action of the stabilizing agent. A water-permeable roadbed 12 is formed.

  In addition, as shown in FIG. 2, the soil 15, the cement-based solidifying agent 16, the aggregating agent 17, and the coal ash 18 are mixed and stirred, and the mixture formed thereby is laid on the roadbed 12, When the roadbed 13 is formed by rolling, the soil 15 particles, the cement-based solidifying agent 16 particles, and the coal ash 18 form a three-dimensional aggregate structure by the action of ions in the aggregate agent 17. Thus, continuous voids are generated, and the voids are solidified by the cement-based solidifying agent 16 to such an extent that these voids are not broken by external force. For this reason, the roadbed 13 having both water permeability and water retention is formed. Thereafter, a pavement structure 10 having water retention is completed by placing a granulated asphalt material on the roadbed 13 to form a water retention asphalt layer 14.

  When rainwater or the like falls on the surface of the water retention asphalt layer 14 constituting the surface layer of the pavement structure 10, these water W passes through the water retention asphalt layer 14 and is sucked into the roadbed 13 and penetrates into the voids in the roadbed 13. Thus, water retention is obtained.

  On the other hand, the road bed 12 located below the road bed 13 is a dense structure and has no water permeability. Therefore, even if the water W held in the road bed 13 moves downward, the road bed 12 does not penetrate into the road bed 12. For this reason, even if it passes for a long time after construction, the road bed 12 is not damaged by the water | moisture content W which osmose | permeated the roadbed 13, and exhibits outstanding durability.

  The blending ratio of the mixture of the soil and the stabilizing agent for forming the road bed 12 is not particularly limited, but in this embodiment, 50 kg to 150 kg of the stabilizing agent is added to 1000 kg of the soil. Thus, a mixture was formed and placed on the ground 11 to form an impermeable road bed 12.

  Moreover, although it does not specifically limit also about the mixture ratio of the mixture of the soil for forming the roadbed 13, a cement-type solidification agent, an aggregating agent, and coal ash, In this embodiment, with respect to 1000 kg of soil, By adding 40 kg to 60 kg of solidifying agent 16, 2.0 liter to 3.0 liter of agglomerating agent, 100 kg to 200 kg of coal ash to form a mixture, and placing this on the road bed 12, A roadbed 13 excellent in water permeability and water retention could be formed.

  Further, the water retention asphalt layer 14 can be formed by using a conventional asphalt technique, but in this embodiment, the porosity 15 formed using a modified asphalt or a modified asphalt having a high viscosity is used. When the water-retaining asphalt layer 14 was formed using ~ 25% of the granulated asphalt mixture, excellent water retentivity could be obtained.

  The stabilizing agent, the cement-based solidifying agent, the aggregating agent, and the coal ash are not particularly limited, but in this embodiment, as the stabilizing agent, “Fe Co., Ltd.” "Lime", Sumitomo Osaka Cement Co., Ltd.'s "Toughlock TL-3E (trade name)" as a cement-based solidifying agent, and Global Research Institute "GB-2000 (trade name)" as an agglomerating agent. When fly ash and bottom ash from a thermal power plant or the like was used as coal ash, excellent effects as described above could be obtained.

  The agglomerating agent “(trade name) GB-2000” of Global Laboratories Ltd. is a polymer compound composed of a complex of magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine. is there. When this “GB-2000 (trade name)” was added to the soil and the cement-based solidifying agent, an excellent aggregate action was exhibited, and the roadbed 13 having a solid three-dimensional aggregate structure could be formed. Moreover, when “Tough Rock TL-3E (trade name)” was used as the cement-based solidifying agent, the effect of making the aggregate structure of the surface layer of the roadbed 13 difficult to break was obtained.

  The pavement structure according to the present invention can be widely used as a pavement structure for parks, open spaces, parking lots and the like as well as general roads such as roadways and sidewalks.

It is a vertical sectional view showing the pavement structure which is an embodiment of the present invention. It is a schematic process drawing which shows the construction procedure of the roadbed which comprises the pavement structure shown in FIG. It is a vertical sectional view showing a conventional pavement structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pavement structure 11 Ground 12 Subgrade 13 Subbase 14 Water retention asphalt layer 15 Soil 16 Solidifying agent 17 Aggregating agent 18 Coal ash

Claims (4)

  A road bed formed by placing a mixture of soil and a stabilizing agent on the ground, and a mixture of soil, a cement-based solidifying agent, an aggregating agent, and coal ash are placed on the road bed. A pavement structure comprising a formed roadbed and a water-retaining pavement layer formed on the roadbed.   The pavement structure according to claim 1, wherein Fe lime is used as the stabilizing treatment agent.   The pavement structure according to claim 1 or 2, wherein the water retentive pavement layer is a water retentive asphalt layer or a water retentive interlocking block layer.   The pavement structure according to claim 3, wherein the water-retaining asphalt layer includes open-grain asphalt.

Images