JP2006214221A - Road pavement material having water-retentivity - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a road pavement material having water-retentivity which is characterized by charging a water-retentive material into a void which exists at a surface course of an asphalt slab with drainage properties. <P>SOLUTION: Powder such as discarded glass or discarded gypsum is charged as a water-retentive material into the void which exists in the asphalt slab with drainage properties of the surface course of the existing roads surfaced with asphalt with drainage properties or newly executed paved roads. Then water retentivity are provided to the road pavement material by incorporating water into among the powder of the discarded glass or discarded gypsum charged into the void. In Fig. 3, 5 is a coarse aggregate covered with an asphalt coating, 6 is a fine aggregate covered with the asphalt coating, and 7 is the water-retentive material. When the temperature of the road surface has increased because of sunlight after rainfall, the water, which is incorporated among the powder of the discarded glass or the discarded gypsum charged into the void of the surface course of the asphalt slab with drainage properties, lowers the temperature of the asphalt slab road surface with drainage properties because of vaporization heat by transpiration by the sunlight heat or the temperature of the asphalt slab with drainage properties. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a road pavement having water retention property using industrial waste such as waste glass and waste gypsum in order to prevent a heat island phenomenon in the center of a city.

  In recent years, the temperature tends to rise in the summer, and in particular, the center of the city is abnormal or hot compared to the suburbs, causing the heat island phenomenon. One reason for this is that the heat from the outdoor unit due to the use of an air conditioner, the sunlight and reflection of direct sunlight on the roof and walls of the concrete building, and the paved road surface, Walls and paved road surfaces are warmed to increase the temperature and store heat, especially in the city center where the temperature is higher than the surrounding temperature, such as in the suburbs. Yes.

  As measures to suppress the heat island phenomenon in this city, planting on the roof of buildings and watering by flooding using water vaporization heat on the road surface are performed, but the duration of the temperature reduction effect is short. It's time. In addition, in order to maintain the effect for a long time, the uppermost layer of the pavement surface of the road was paved with a high porosity, and this void was filled with a water retention material made of a polymer-based polymer material, resulting in rain. In some cases, rainwater is stored with this water retaining material, and when the rain stops and the sun shines and the temperature of the road surface rises, the temperature of the pavement surface of the road is increased by the heat of rainwater trapped in the water retaining material in the gap. In order to prevent the heat island phenomenon in the urban area of the city by lowering the surrounding temperature, the road surface with water retention is paved.

Moreover, the water retention block as described in the following [patent document 1] is known as a countermeasure against the road surface. This water retaining block includes a cementitious block used as a concrete block for sidewalks, etc., cement, aggregate, water, and a water retaining material. The water-retaining block is composed of one or more kinds selected from powder and rock wool powder. This water-retaining block is made of autoclaved aerated concrete, pearlite powder, rock wool as a water-retaining material. Therefore, an appropriate communication hole is formed on the surface of the water retention block without a process for forming the communication hole on the surface of the water retention block during the production. When water enters and holds through the holes and the rain stops and the sun shines and the road surface temperature rises, the heat of the water vaporizes the road surface temperature. In which it is possible to obtain the effect of suppressing rise.
JP 2003-252673 A

  However, in the water retention block using any of the above-mentioned autoclaved cellular concrete particles, pearlite particles, or rock wool particles as a water retention material, these water retention materials are used as cement, aggregates at the time of manufacture of the block. It is necessary to knead with water.

  Therefore, the present invention fills the voids existing in the drainage asphalt slab of the existing drainage asphalt pavement road or the newly constructed road pavement road with waste glass or waste gypsum powder as a water retention material, The object of the present invention is to provide a road pavement material having water retention by taking in water between waste glass and waste gypsum powder filled in the part.

  In order to achieve the above object, the invention described in claim 1 of the present invention is characterized in that waste glass and waste gypsum powder are filled as a water retention material in a void portion existing in a surface layer portion of a drainable asphalt slab. Is.

  In order to achieve the above object, the invention according to claim 2 of the present invention is characterized in that waste glass powder is filled as a water retaining material in a void existing in a surface layer portion of a drainage asphalt slab. The invention according to claim 3 of the present invention is characterized in that waste gypsum powder is filled as a water-retaining material in the voids existing in the surface layer portion of the drainage asphalt slab. Furthermore, the invention according to claim 4 of the present invention is characterized in that the particle size of the powder is 0.6 mm below the sieve.

  The invention according to claims 1 to 4 of the present invention is a waste glass or waste gypsum powder in a void existing in a drainage asphalt slab of a surface layer portion of an existing drainage asphalt pavement road or a newly constructed road pavement road. When there is rain or flooding, water is taken in between the powder of the water retaining material, and when the temperature of the road surface rises due to the sun, the powder of the water retaining material in the gap The effect is that the heat island phenomenon in urban areas can be prevented by lowering the temperature of the pavement surface of the road and lowering the surrounding temperature by the heat of hatching of water taken in between.

  In order to suppress the heat island phenomenon in urban areas of the city, wastewater glass and waste gypsum crushed 0.6 mm sieve powder is mixed with water to make a water retention material, and the water retention material is a mixture of this water and powder. The space formed in the surface layer portion of the drainage asphalt slab that forms the road surface was filled from the top, and the space in the surface layer portion of the drainage asphalt slab and the space were filled by rain or flooding in midsummer. Waste glass and waste gypsum powder take water between the powders as a water retention material, and when the rain stops and the sun shines and the temperature of the road surface rises, the drainage asphalt slab is filled into the voids on the surface layer. The water taken in between the waste glass and waste gypsum powder will evaporate due to the heat of the sun and the temperature of the drainage asphalt slab. By snatch suppress the heat island phenomenon in urban by lowering the temperature of the peripheral portion with lowering the temperature of the drainage asphalt slab road.

  The water retention effect of the drainable asphalt specimen filled with the water retaining material of the waste glass powder and waste gypsum powder of the present invention in the voids of the surface layer is first explained by experiments conducted in the room, regarding the temperature suppression of the surface of the drainable asphalt slab. To do. FIG. 1 is a schematic view of a comparison experiment in a room between a water-retaining material unclothed unfilled slab specimen A and a water-retaining material cloth-filled slab specimen B. FIG. 2 is a partially enlarged schematic view of a longitudinal section of a water retaining material unfilled slab specimen A, and FIG.

  A is a drainage asphalt slab specimen having drainage, and B is a drainage asphalt slab specimen filled with a water retention material. Reference numeral 1 is a projector, 2 is a temperature measurement recorder, 3 is a temperature sensor (thermocouple) provided at the center of the slab specimens A and B, and 4 is a temperature sensor provided at the corner of the slab specimens A and B ( Thermocouple). Each of the slab specimen A and the slab specimen B has a side length of 30 * 30 cm, a specimen having a thickness of 5 cm, and a porosity of 15 to 18%. Each slab specimen is wrapped on the bottom and four sides of the slab to prevent water leakage, and the top is fixed with adhesive tape. Further, the projectors 1 and 1 are installed at an interval of 80 cm, are installed so as to be irradiated from 38 cm directly above the surfaces of the slab specimens A and B, and each slab specimen A and the slab specimens. The irradiation height is determined such that the surface temperature of the slab specimen is 60 degrees in a state where water is not applied to the surface of the specimen B.

[Indoor Experiment] The specifications of the drainable asphalt slab specimen A having drainage used in this laboratory experiment are as follows.
The size of the drainage asphalt slab A: a plate-like body having a side length of 30 cm * 30 cm and a thickness of 5 cm, the density of the drainage asphalt slab A is 2.45 cubic cm, and the porosity is 17%.
The drainage asphalt slab A has the following composition.
Coarse aggregate (gravel): sieve mesh (mm) 19-13.2 450 g
Sieve (mm) 13.2-4.75 6480 g
Sieve (mm) 4.75-2.36 585 g
Sieve (mm) 2.36-0.6 495g
Fine aggregate (sand): Sieve (mm) 0.6-0.3 180g
Sieve (mm) 0.3-0.15 225g
Sieve (mm) 0.15-0.075 180g
Filler: sieve mesh (mm) 0.075-405 g
Asphalt amount: 5% of the total weight

Next, the specification of the specimen B used in this laboratory experiment is as follows.
Specimen B-1: A water retaining material obtained by mixing 200 g of waste glass powder in 1 liter of water and filling the voids in the surface layer portion of the drainage asphalt slab A.
Specimen B-2: A water-retaining material obtained by mixing 100 g of waste gypsum powder in 1 liter of water and filling the voids in the surface layer portion of the drainage asphalt slab A.
Then, water is poured over the entire surface of each of the drainage asphalt slab A and the “specimen B-1” and “specimen B-2” that are not filled with a water retention material in the voids of the surface layer portion, Irradiate with projectors 1 and 1 for 6 hours.

  The result of the experiment in this room is as shown in FIG. 4 and FIG. As can be seen from the graphs shown in FIG. 4 and FIG. 5, each specimen B using the water retaining material can obtain a 10 to 20 degree decrease in the temperature cooling effect of the road surface as compared with the specimen A that has been paved. It is possible to suppress the temperature rise on the road surface. It is recognized that the temperature cooling effect of the road surface is greater when the waste glass powder is used as the water retention material than when the waste gypsum powder is used as the water retention material. It is recognized that a large amount of water can be taken into it.

  Next, as [field experiment], the water retention effect of the drainable asphalt slab body filled with the water retaining material of the waste glass powder and waste gypsum powder of the present invention in the surface layer is controlled to suppress the temperature of the surface of the drainable asphalt slab. The field experiment conducted on the moon will be explained. Fig. 6 is a schematic diagram of a comparative experiment in the field of a drainage asphalt slab body and a drainage asphalt slab body filled with a water retention material with different mixing ratios of waste glass powder and waste gypsum powder. The filling arrangement of the material is shown.

  A section of the base base slab 6m * 4.5m common in the outdoors is divided into several sections by a partition plate, and a section filled with various water retaining materials and a section not filled are provided on the surface of each section. In section C, a water retention material, which is a mixture of 1 Kg of waste glass fine powder under a sieve having a particle size of 0.6 mm: 1 Kg of waste gypsum powder and 2 Kg of water, is sprayed on the space on the surface of section C of the base slab. Filled. In the section D, a water retaining material, which is a mixture of 1.25 kg of waste gypsum powder under a sieve having a particle size of 0.6 mm and 2.50 kg of water, is spray-filled in the voids on the surface of the section D of the base base slab. It is. In the section E, a water retaining material, which is a mixture of 1.88 kg of waste glass fine powder under a sieve having a particle size of 0.6 mm and 1.88 kg of water, is spray-filled in the voids on the surface of the section E of the base base slab. It is. The section F is the same as the base base slab having a gap.

  One measurement point was provided in each of these sections, and the surface temperature of each section was measured by a temperature sensor (thermocouple). The measurement results are shown in FIG. As can be seen from the graph in FIG. 7, the surface temperature of each section did not exceed 30 degrees because the measurement time was not summer, but the section filled with water retention material filled with water retention material during the daytime It can be seen that there is a tendency for the temperature of the compartment surface to decrease as compared to the compartment that is not.

It is the schematic of the indoor comparative experiment of the drainable asphalt slab specimen A and the drainable asphalt slab specimen B filled with the water retaining material. It is the longitudinal cross-section part expansion schematic of the drainage asphalt slab specimen A. It is the longitudinal cross-section part expansion schematic of the drainage asphalt slab specimen B filled with the water retention material distribution. It is the graph which measured the time-dependent change of the surface temperature about the drainable asphalt slab specimen A and the drainable asphalt slab specimen B-1 filled with the water retaining material powder using the waste glass powder as the water retaining material. It is the graph which measured the time-dependent change of the surface temperature about the drainage asphalt slab specimen A-2 and the drainage asphalt slab specimen B-2 filled with the water retention material using the waste gypsum powder as the water retention material. It is the schematic of the field comparison experiment with the drainage asphalt slab body which filled the drainage asphalt slab body and the water retention material cloth which mixed the mixing ratio of waste glass powder and waste gypsum powder. It is the graph which measured the time-dependent change of the surface temperature of each division in FIG.

Explanation of symbols

A drainage asphalt slab specimen with drainage,
B drainage asphalt slab specimen filled with water retention material,
C. A water retaining material cloth-filled slab body in which waste glass powder and waste gypsum powder are 5: 5,
D Waste water plaster powder retention slab body
E Wastewater glass powder retention slab body,
1 Floodlight,
2 Temperature measurement recorder,
3 Temperature sensor (thermocouple),
4 Temperature sensor (thermocouple),
5 Asphalt coated coarse aggregate,
6 Asphalt coated fine aggregate,
7 Water retention material.

Claims (4)

  A road pavement material having water retention, characterized in that waste glass and waste gypsum powder are filled as a water retention material in a void portion present in a surface layer portion of a drainage asphalt slab.   A road pavement material having water retention property, characterized in that a waste glass powder is filled as a water retention material in a void existing in a surface layer portion of a drainage asphalt slab.   A road pavement material having water retention property, characterized in that waste gypsum powder is filled as a water retention material in a void portion existing in a surface layer portion of a drainage asphalt slab.   The road pavement material having water retention according to any one of claims 1 to 3, wherein the powder has a particle size of 0.6 mm below the sieve.

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