JPWO2011129022A1 - Paving blocks - Google Patents

Abstract

Pavement that can always exert the effect of suppressing temperature rise near the road surface in summer, has high slip resistance on the road surface, is excellent in safety, and can easily form pavements such as sidewalks and roadways in a short time. Provide block. The pavement block 1 is formed by forming a coating 3 made of a thermal barrier paint for pavement on the uneven surface of the cement-based cured body 2. The uneven surface of the cement-based cured body 2 is a mold having (a) production of the cement-based cured body as porous concrete, (b) shot blasting, (c) wash-out finishing, and (d) an uneven inner surface. Formed by one or more selected from the use of a frame. The paving block 1 can be provided with a base layer 4.

Description

  The present invention relates to a pavement block for suppressing a temperature rise near a road surface of a pavement due to direct sunlight in summer.

Conventionally, various pavement blocks are known for suppressing a temperature rise near the surface of the pavement block to alleviate the heat island phenomenon in summer.
As an example, a roadbed material layer that secures necessary voids by adjusting the particle size of the roadbed material is provided above the roadbed, and a porous water retention block is laid above the roadbed material layer, and the water retention block A water-retaining pavement structure that obtains a cooling effect on the pavement surface by evaporation of moisture from the surface, and a plurality of water-impermeable trays with an open top surface are installed on the road bed or in the roadbed material layer Has been proposed (Patent Document 1).
As another example, in the heat storage suppression block in which a surface layer is provided on the base layer, the surface layer is formed of a solidified layer mainly composed of calcium carbonate and magnesia cement, and the base layer is set as a strength body. A heat storage suppression block characterized by the above has been proposed (Patent Document 2).
On the other hand, a technique for suppressing a temperature rise near the surface of a pavement made of a dense particle size asphalt mixture, which is not a pavement block, is also known.
Examples include pigments that absorb in the visible region of sunlight and reflect in the infrared region, solvent-soluble acrylic resins, acrylic emulsion resins, urea resins, epoxy resins, solvent-soluble fluorine resins, and fluorine-based pigments. There has been proposed a paving body such as a road characterized by applying a thermal barrier paint containing a vehicle selected from any one or two or more of emulsion resins and, if necessary, a white pigment ( Patent Document 3).

JP 2007-270487 A JP 2005-23545 A JP 2004-251108 A

In the technique of the above-mentioned patent document 1, since a porous water retention block is laid above the roadbed material layer that secures a necessary gap, moisture such as rainwater is stored inside the water retention block. When the water evaporates, the surrounding heat can be absorbed and the temperature near the road surface can be reduced. However, in this technique, the material itself forming the porous water-retaining block does not have an action of lowering the temperature near the road surface. That is, the decrease in the temperature near the road surface in this technique is based on the assumption that moisture such as rainwater is supplied.
The technology of Patent Document 2 is that the material itself forming the surface layer of the block has the effect of suppressing the increase in the surface temperature of the block, but the strength of the cured body (cured material of the material containing calcium carbonate and magnesia cement) that forms the surface layer. However, there exists a problem that it is smaller than the intensity | strength of the hardening body (concrete) which forms a base layer.
Patent Document 3 describes an experimental example using a dense particle size asphalt mixture and an experimental example using a porous asphalt mixture. However, no experimental example using a cement-based composition such as concrete is described at all. Moreover, the technique of patent document 3 is related to the paving body which consists of a dense particle size asphalt mixture etc., and is not related to a paving block. Therefore, after forming the main body of a paving body outdoors using materials, such as a dense-graded asphalt mixture, a thermal-insulation coating must be applied and the operation | work until a paving body is completed is complicated.
On the other hand, it is desirable that the road surface of the pavement has high slip resistance, is not slippery in applications such as sidewalks and roadways, and is excellent in safety.
Therefore, the present invention can always exert an effect of suppressing the temperature rise near the road surface in summer, has a high resistance to slipping on the road surface, is excellent in safety, has a good landscape and durability, a sidewalk, a roadway, etc. An object of the present invention is to provide a paving block capable of easily forming a paving body in a short time.

As a result of diligent study to solve the above-mentioned problems, the present inventor has formed a coating made of a thermal barrier paint for paving on the surface of a cement-based cured body having a surface for forming a paving surface. According to the block, the inventors have found that the above object can be achieved and completed the present invention.
That is, the present invention provides the following [1] to [3].
[1] A pavement block characterized in that a film made of a thermal barrier paint for pavement is formed on the uneven surface of a cement-based cured body.
[2] The uneven surface of the cement-based cured body is (a) production of the cement-based cured body as porous concrete, (b) shot blast finish, (c) wash-out finish, (d) uneven surface. The pavement block according to [1], wherein the pavement block is formed by one or more selected from the use of a mold having the following.
[3] The pavement block according to [1] or [2] above, wherein the cement-based cured body and the coating film have the same color or an approximate color.

Since the pavement block of the present invention has a coating composed of a thermal barrier paint for pavement formed on an uneven surface of a cement-based hardened body, it is uneven in periods such as summer when the temperature rise near the road surface due to direct sunlight is significant. Because of the heat dissipation from the coating, which has a large area and has various light receiving angles with respect to changes in the incident angle of sunlight, the high effect of suppressing the temperature rise near the road surface is stably achieved. Demonstrating and mitigating the heat island phenomenon.
Moreover, since the pavement block of the present invention is formed with a coating made of a thermal barrier paint for pavement on the uneven surface of the cement-based cured body, pedestrians, automobiles, etc. pass through the cement-based cured body. Even when the film near the top of the uneven surface is peeled off, the film in the region other than the vicinity of the top of the uneven surface remains without being peeled off. The high effect of suppressing the rise can be maintained over a long period of time.

In addition, the pavement block of the present invention has an uneven surface and uses a thermal insulating paint for pavement that can be blended with various pigments. For example, the pavement block has a single color road surface. Even if it exists, it can have the outstanding scenery property, such as a shadow changing with the time-dependent change of the angle of sunlight, and giving a unique external appearance.
In addition, since the paving block of the present invention uses a cement-based hardened body having an uneven surface, the sliding resistance of the road surface is large, and when used for applications such as sidewalks and roadways, pedestrians slip and fall. There is little risk of accidents such as accidents, and safety is also excellent.
Furthermore, the pavement block of the present invention can be used by transporting it to the construction site as a finished product obtained by preliminarily applying a thermal barrier paint for pavement in a manufacturing factory, and a pavement that forms a road surface such as a sidewalk or a roadway. It can be formed easily and in a short time.

It is sectional drawing which shows notionally an example of the pavement block of this invention. It is a schematic diagram which expands and shows the surface vicinity of the pavement block shown in FIG.

Hereinafter, an example of the pavement block of the present invention will be described with reference to the drawings.
1 and 2, a pavement block 1 is composed of a surface layer formed by forming a coating 3 made of a heat-shielding paint 3 a for pavement on the uneven surface of a cement-based cured body 2 and a base layer 4.
The uneven surface of the cement-based cured body 2 is a surface (upper surface) for forming road surfaces such as sidewalks, roadways, and parking lots.
The cement-based cured body 2 and the coating 3 may be the same color or different colors, but are preferably the same color or approximate colors. If it is the same color or an approximate color, for example, when the thermal barrier paint near the top of the uneven surface is peeled off due to friction with a pedestrian or a vehicle, the exposed portion of the cement-based cured body 2 that appears due to the peeling off In addition, a large color difference does not occur between the coatings 3 that remain without peeling off, and the appearance is not impaired.
In the present specification, the approximate color refers to a color difference ΔE of 6 or less, more preferably 3 or less when the side color is JIS Z 8729 (CIE Lab display system).
When an asphalt-based cured body layer made of a dense particle size asphalt mixture, a porous asphalt mixture, or the like is adopted instead of the cement-based cured body 2, the alfalt-based cured body itself is rubbed by deformation and friction at high temperatures. Since the reduction occurs, it is considered that the amount of the coating film 3 peeled off is larger than that of the cement-based cured body. Further, in this case, a color difference occurs between a portion where the coating 3 is not peeled off and a portion where the coating 3 is peeled off (portion where the asphalt-based cured body is exposed), which also impairs the appearance.

The coating 3 may be formed only from the thermal barrier paint for paving, or may be formed from the thermal barrier paint for paving and fine aggregates such as silica sand.
In the present invention, an excellent slip resistance can be obtained even when the coating 3 is made of only a thermal barrier paint for paving. In addition, when it replaces with the cement-type hardened | cured body 2 and an asphalt-type hardened | cured body is employ | adopted and the film 3 does not contain fine aggregates, such as silica sand, it is difficult to obtain the outstanding slip resistance. In this regard, in the present invention, an excellent slip resistance having a road surface BPN value (slip resistance) of 60 or more can be obtained without using fine aggregates such as silica sand.

  The thickness of the coating 3 is preferably 30 to 2,000 μm, more preferably 100 to 1,000 μm, and particularly preferably 200 to 500 μm. If the thickness is less than 30 μm, the effect of suppressing the temperature rise near the road surface cannot be sufficiently obtained, and it is difficult to make the thickness of the coating uniform. Furthermore, the durability of the coating also decreases. If the thickness exceeds 2,000 μm, an increase in the temperature rise suppression effect in the vicinity of the road surface cannot be expected, and the use amount of the thermal barrier paint for paving increases, which is economically disadvantageous. If the block is water permeable, it may block the voids on the surface of the pavement block and lower the water permeability. Moreover, since the depth of the unevenness on the surface of the pavement block becomes shallow and the shadow becomes thin, the appearance also deteriorates.

In this specification, the thermal barrier paint for pavement (hereinafter sometimes abbreviated as “thermal barrier paint”) is a paint for forming a paint film on the pavement surface, and is used near the pavement surface by direct sunlight. It refers to a paint that can exert an effect of suppressing temperature rise.
The thermal barrier paint used in the present invention is a 150 W light source arranged at a point where the surface temperature of the standard dense particle asphalt reaches 60 ° C. when the surface of the standard dense particle asphalt is irradiated for 3 hours at a temperature of 20 ° C. On the other hand, the surface temperature is preferably 5 ° C. or more (surface temperature: 55 ° C. or less), more preferably by forming a 300 μm-thick film on the surface of this standard dense-graded asphalt using a thermal barrier paint. Can be lowered by 10 ° C. or more (surface temperature: 50 ° C. or less).
Examples of the thermal barrier paint include (a) a pigment that absorbs electromagnetic waves in the visible light region and has a high reflectance of electromagnetic waves in the infrared region (780 to 2100 nm) with respect to sunlight (for example, used as a constituent component of the paint). Color pigments, white pigments or extender pigments having such properties), (b) those kneaded with materials that suppress heat storage and have high heat dissipation performance, (c) electromagnetic waves in the infrared region Heat-shielding material such as (d) heat-insulating material (for example, hollow ceramic balloon particles), (e) rutile titanium oxide (white pigment) By spraying retro beads such as transparent ceramic beads on the upper surface of the coating film containing the components having performance, the retro beads were partially submerged and partially exposed in the coating film. Also Although the like, but is not limited thereto.
As the thermal barrier paint, one kind selected from the above (a) to (e) may be used alone, or two or more kinds may be used in combination.

Examples of the thermal barrier paint include, but are not limited to, a silicon acrylic emulsion system, an acrylic emulsion system, a solvent-soluble acrylic system, a urethane resin system, a urea resin system, an epoxy resin system, and a vinyl ester resin system. It is not a thing.
Examples of commercially available thermal barrier paints include “ATTSU-9 load W”, “ATTSU-9 load U” (manufactured by Nippon Paint Co., Ltd.), “SP reflector W”, “SP reflector V” (all East Paint Co., Ltd., “Shernets” (Arakawa Paint Co., Ltd.), “Cool Top Hood” (Suzuka Fine Co., Ltd.), “Cool Lane” (Superia Co., Ltd.), “Miracool S300” (Nagashima Special Paint Co., Ltd.) ), “Eco Cool Mild” (manufactured by Dainippon Paint Co., Ltd.), “Color Falto Cool” (manufactured by Daido Paint Co., Ltd.) and the like.
These thermal barrier paints have alkali resistance and water resistance, and are preferably used in the present invention.
Examples of the method for applying the thermal barrier paint include spraying, roller, brush, curtain flow, dipping and the like.
Examples of the method for curing the thermal barrier coating include room temperature curing, heat curing, and UV curing.
A transparent protective film may be formed on the coating 3 by applying a transparent coating agent made of a material such as acrylic, polyurethane, or polycarbonate. By the protective film, durability, antifouling property, scratch damage resistance, weather resistance and the like of the coating 3 can be enhanced.

The uneven surface of the cement-based cured body 2 is a mold having (a) production of the cement-based cured body as porous concrete, (b) shot blasting, (c) wash-out finishing, and (d) an uneven inner surface. It can be formed by one or more selected from the use of a frame.
In addition, the combination of said (a) and said (d) is mentioned as an example of these suitable combinations. In this case, as an example of the physical properties of the paving block, the decrease in the surface temperature under the conditions defined in the above definition for the thermal barrier coating is 10 ° C. or more (surface temperature: 50 ° C. or less), and “JIPEA The slip resistance measured according to the slip resistance test method of the interlocking block prescribed | regulated to "-TM-6" is 80 BPN or more.

First, (a) will be described.
When producing the cement-type hardened body 2 as porous concrete, the pavement block 1 may be produced as a water-permeable material with the base layer 4 made of porous concrete, or the base layer 4 is made of dense concrete and impermeable to water. You may produce as a thing of nature.
In the case of having water permeability, as shown in FIG. 2, the cement-based hardened body 2 has the necessary strength as a paving block with the coarse aggregates 2a fixed by the paste 2b, and has continuous voids 2c. Etc. can be permeated from the road surface, moisture can be discharged into the ground from the lower part of the pavement block, and has excellent water permeability. In this case, the water permeability of the pavement block 1 is preferably 0.01 cm / second or more, more preferably 0.05 to 0.5 cm / second.
Moreover, the volume ratio of the continuous space | gap 2c in the pavement block 1 which has water permeability is 16 to 28%, for example. When the proportion is less than 16%, the water permeability coefficient becomes small, and excellent water permeability cannot be obtained. If the ratio exceeds 28%, the strength required for use as a paving block cannot be obtained, and the gap diameter increases, so that the unevenness of the surface of the paving block increases and walking safety decreases. To do.
The cement-based cured body 2 can be formed using a normal material for producing a porous concrete cured body (porous concrete cured body).
The BPN value (slip resistance) of the road surface of the permeable or non-permeable pavement block 1 is 40 or more for a sidewalk and 60 or more for a roadway.
The base layer 4 is usually formed as a hardened porous or non-porous concrete.

The shot blasting finish of the above (b) refers to a method in which steel ball grains are sprayed onto the cemented hardened body 2 for processing.
By shot blasting, for example, an uneven surface having a depth of 0.2 to 5.0 mm can be formed.
The washing finish of (c) is to wash the surface with water before the cement paste of the cement-based cured body 2 made of a material kneaded with seed stones has not yet hardened to expose a part of the seed stone on the surface portion. Say the method.
The wash-out finish can form an uneven surface having a depth of 0.3 to 15 mm, for example, depending on the size of the seed stone.

The “use of a mold having an uneven inner surface” in (d) above uses a mold having an uneven inner surface such as a slit.
As an example of the slit-shaped unevenness, the side surface viewed from the side is a sawtooth shape in which a large number of triangles are connected, and the flat surface viewed from above is a linear peak (top) and a linear valley ( The bottom) may appear alternately and parallel to each other. In this case, the pitch between the ridges is, for example, 3 to 50 mm, and the distance between the ridges and the valleys (the depth of the unevenness) is, for example, 1 to 10 mm.
As other examples of the slit-shaped unevenness, the side shape viewed from the side includes a hook-tooth shape, a wave shape, and the like, and the cross-sectional unevenness and the like are also given to the plane viewed from above.
Examples of the irregular shape other than the slit shape include a dot shape, a truncated cone shape, a quadrangular frustum shape, and an X shape.

[Example 1]
(1) Cement-based hardened body A block A which is porous concrete having water permeability (block surface color tone: cement gray (N5), dimensions: length 100 mm × width 200 mm × thickness 60 mm, top surface form: flat) did.
(2) Coating film-forming coating Thermal barrier coating (trade name: ATTSU-9 load W, color: gray (N7), manufactured by Nippon Paint Co., Ltd.) was used as the coating film-forming coating a.
(3) Pavement block The coating layer forming paint a was applied to the upper surface of the block A by air spraying to obtain a pavement block 1. The thickness of the coating after application was 200 μm.

(4) Measurement of the temperature of the top surface of the pavement block during light irradiation In the laboratory, the pavement block is in contact with all of the surfaces (five surfaces) except for the top surface of the pavement block with the foamed polystyrene foam. Fixed. A light source (beam lamp; 150 W) was disposed above the pavement block. The position of the light source is the surface temperature of the standard dense particle asphalt when irradiated for 3 hours at room temperature (20 ° C.) using a standard dense particle asphalt (see Comparative Example 2 described later) instead of the pavement block 1. Was set at a point where the temperature reached about 60 ° C.
While the light is irradiated for 3 hours, the center point temperature of the surface of the pavement block 1 is measured at intervals of 1 minute using a data logger with a T-type thermocouple, and the maximum temperature ("surface temperature" in Table 1). Asked. The results are shown in Table 1.
(5) Measurement of hydraulic conductivity and slip resistance Permeability of interlocking blocks specified in “JIS A 5371 Precast Unreinforced Concrete Products Appendix 2 (Specification) Recommended Specifications for Pavement / Boundary Blocks 2-3 Interlocking Blocks” According to the test method, the water permeability coefficient of the pavement block 1 was measured.
Further, the slip resistance of the paving block 1 was measured according to the slip resistance test method of the interlocking block specified in “JIPEA-TM-6”. The results are shown in Table 2.

[Example 2]
The surface temperature, water permeability coefficient, and slip resistance of the paving block were measured in the same manner as in Example 1 except that the following film forming paint b was used instead of the film forming paint a. The results are shown in Tables 1 and 2.
A thermal barrier paint (trade name: SP reflector W, color: beige (N7), manufactured by Shinto Paint Co., Ltd.) was used as the paint b for film formation.
[Comparative Example 1]
The surface temperature, water permeability coefficient, and slip resistance of the paving block were measured in the same manner as in Example 1 except that the coating film forming paint a was not used. The results are shown in Tables 1 and 2.
[Comparative Example 2]
The surface temperature of the paving block was measured in the same manner as in Example 1 except that the block B made of dense-graded asphalt concrete was used instead of the block A. The results are shown in Table 1.

[Example 3]
Slit shape with a flat convex part width of 5 mm, a flat concave part width of 3 mm, and a vertical wall height (concave / convex depth) of 1.5 mm (formed using a mold having a concave / convex inner surface) The surface temperature of the paving block was the same as in Example 1 except that the block C prepared in the same manner as the block A was used except that the thickness of the coating film a was set to 300 μm. The water permeability coefficient and slip resistance were measured. The results are shown in Tables 1 and 2.
[Example 4]
The surface temperature, the water permeability coefficient, and the slip resistance of the pavement block were measured in the same manner as in Example 3 except that the film forming paint b was used in place of the film forming paint a. The results are shown in Tables 1 and 2.

DESCRIPTION OF SYMBOLS 1 Pavement block 2 Cement-based hardened body 3 Coating made of thermal barrier paint for pavement 4 Base layer 5 Surface 2a Coarse aggregate 2b Paste 2c Continuous void 3a Thermal barrier paint for pavement

Claims (3)

  A pavement block characterized in that a film made of a thermal barrier paint for pavement is formed on the uneven surface of a cement-based cured body.   A mold in which the concavo-convex upper surface of the cement-based cured body has (a) production of the cement-based cured body as porous concrete, (b) shot blast finish, (c) washout finish, (d) concavo-convex inner surface The paving block according to claim 1, wherein the paving block is formed by one or more selected from the use of a frame.   The pavement block according to claim 1 or 2, wherein the cement-based cured body and the coating film have the same color or an approximate color.

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