JP3380758B2 - Elastic pavement - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pavement for improving the durability and elasticity of pavement surfaces such as sidewalks, plazas and playgrounds.

[0002]

2. Description of the Related Art In recent years, road surface pavements having appropriate elasticity have been demanded in order to improve durability and environmental suitability of road surfaces. Examples of conventional elastic pavements include those mainly composed of cement or asphalt concrete and containing various aggregates and a synthetic resin binder for adhering these aggregates to each other. Due to the inclusion of the synthetic resin binder, the pavement will have some elasticity. However, this kind of elastic pavement can function sufficiently in an environment where mechanical strength and abrasion resistance are required, but it reduces the burden on the legs and waist of the human body such as athletic fields and jogging courses. It was not possible to obtain moderately flexible elasticity.

Then, as a means for imparting such elasticity to the pavement, Japanese Patent Laid-Open No. 63-7404 of the applicant of the present application.
There is one described in Japanese Patent Publication (hereinafter referred to as "publication"). In this publication, hard granular aggregate, soft elastic aggregate, and an amount of synthetic resin binder sufficient to bond these aggregates to each other are kneaded to form resin concrete, and this resin concrete is applied to the surface of the paved substrate. A pavement is disclosed in which an elastic resin concrete layer having a water-permeable porous property is formed by coating and curing the aggregate on the base, and the aggregate is bonded to each other by a binder resin. However, this elastic resin concrete layer has a low mechanical strength and is easily deformed when a heavy load such as a large vehicle passes through the layer, and therefore it has been limited to applications such as tennis courts.

As another elastic pavement, there is one in which reinforced mortar in which glass fiber and synthetic resin emulsion are mixed in a Portland cement mortar in an amount of 5 to 20% with respect to the cement amount is laid on a paved base. Since the shrinkage of cement mortar is large, it is difficult to obtain flexible elasticity. Further, instead of the reinforced mortar, reinforced ascon mixed with asphalt concrete or synthetic rubber was also tried as an elastic pavement material, but it was not possible to obtain soft elasticity.

[0005]

As described above, as described above,
It has been difficult to give elastic pavements both mechanical strength and pliable elasticity. In addition, all of the above elastic pavements can be said that if the ground (base to be paved) is subjected to rolling compaction and the base is sufficiently leveled before paving, there will be a gap between the base surface and the surface layer. It is that the pavement will not recover with dents or deformations occurring. This is a phenomenon that occurs as the pavement surface layer has higher flexibility. For example, the road surface at the entrance / exit of a vehicle such as a construction site is apt to be rutted due to a wheel load flowing due to tires of a large vehicle such as a truck. When using the above elastic pavement, in order to repair the missing part of the road surface due to such rut, the road surface in the vicinity of the missing part must be peeled off and paved on a flat ground surface, The pavement work required time and effort.

In view of such circumstances, the present invention can be paved without sufficiently leveling the base that is the paved base, and can be recovered even if the surface layer of the pavement is deformed or dented. An object of the present invention is to provide an elastic pavement which has a soft elasticity suitable for exercise while reducing the load on the vehicle and provides mechanical strength that can withstand the passage of a large vehicle.

[0007]

In order to achieve the above object, the elastic pavement of the present invention has a resin emulsion and an average particle size of 0.1 to 15.0 on an underlayer made of crusher run or a mixture of crusher run and earth and sand. Mainly composed of aggregate made of sand stone whose grain size is adjusted to mm,
3 to 50 parts by weight of a resin emulsion is mixed with 0 part by weight, and 100% or less of cement is mixed with the amount of the resin emulsion to form an elastic compound layer to evaporate the water content of the resin emulsion. Alternatively, the water is removed by hydrating the cement with the water and the aggregates are bonded to each other with a synthetic resin binder, and the elongation of the elastic compound layer is within the range of 10 to 200% and The layer thickness is set within the range of 5 to 50 mm.

In order to obtain the elastic compound layer having such characteristics , the water content in the resin emulsion is
It is preferable that the ratio is 40 to 60% by weight .

Further , as a particularly preferred resin emulsion
For olefin resin emulsion, acrylic resin
Emulsion can be used, rubber type resin emulsion is used
You can also Here, the elastic deformation
To easily follow and deform the compound layer, acrylic type
For adhesive resin emulsions that use resins as constituents
Is preferred.

Further , the underlayer and the elastic compound layer
It is also preferable to arrange a net-like reinforcement on the boundary surface of
Yes.

Further, a columnar object is provided on the underlayer.
While forming the elastic compound layer between the columnar objects,
It is also preferable that it is formed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various typical embodiments of the present invention will be described below with reference to the drawings.

1 and 2 are sectional views showing a schematic structure of an elastic pavement body according to the present invention. The elastic pavement 1 shown in FIG. 1 has a base layer 3 formed on a paved base 2 which is a natural or artificial ground, and a synthetic resin binder containing a resin emulsion and bone on the base layer 3. And a water-curable material such as Portland cement are mixed to form an elastic compound layer 4, and the water contained in the elastic compound layer is evaporated or the water-curable material is hydrated with the water. By removing the water and by bonding the aggregates to each other with a synthetic resin binder, the elongation of the elastic compound layer is set in the range of 10 to 200% and the layer thickness is 5 to 50 mm. It is set within the range. In addition, the elastic pavement 5 shown in FIG. 2 has an elastic compound layer 6 having the same structure as the elastic compound layer directly on the rough ground surface 7 of the ground layer 8 such as natural paved ground. It is formed so as to be within the range of 5 to 50 mm.
In this way, the elastic compound layer according to the present invention can be closely bonded to a rough base surface, so that slippage or peeling between the elastic compound layer and the base layer is unlikely to occur.
It has excellent durability.

The aggregate has an average particle size of 0.1 to 15.0.
mm, more preferably 2.0 to 10.0 mm, specifically,
Mountain sand, river sand, crushed stone, gravel, silica sand, crushed glass, etc. with adjusted particle size are used. Further, in order to adjust the bonding force between the aggregates and obtain the elongation percentage, 3 to 50 parts by weight of the resin emulsion, preferably 100 parts by weight of the aggregate, is preferable.
3 to 25 parts by weight, more preferably 5 to 15 parts by weight, is added, and the water-curable material is added at 100% or less of the amount of the resin emulsion. Furthermore, when elasticity is imparted to the elastic compound layer after formation and water permeability is also imparted at the same time, it is desirable to suppress the compounding amount of the resin emulsion to increase the porosity in the layer. If the amount of the resin emulsion is less than 3 parts by weight, the bonding strength between the aggregates cannot be sufficiently increased, and the layer becomes brittle. On the other hand, if the amount of the resin emulsion exceeds 50 parts by weight, the elasticity is increased. The proportion of the resin in the compound layer becomes too high, which lowers the mechanical strength of the layer. On the other hand, if the blending amount of the resin emulsion exceeds 15 parts by weight, the porosity in the layer becomes low and it becomes difficult to form continuous pores, so that the water permeability of the layer cannot be sufficiently ensured.

The water content of the resin emulsion is preferably set to 40 to 60% by weight, particularly 40 to 50% by weight. When the water content exceeds 60% by weight, it is difficult to cure the elastic compound unless a large amount of water-curable material is used. When a large amount of water-curable material is used, it is possible to obtain flexible elasticity. Can not.

As the water-curable material for hydration reaction with water in the resin emulsion, portland cement or white cement is preferable from the viewpoint of low cost and easy availability, but silica cement, alumina cement and ettringite are preferable. Etc. can also be used. When it is desired to improve plasticity, a plasticizer such as DBP (dibutyl phthalate) can be used as an additive. However, such a plasticizer is liable to cause environmental pollution. In addition, the plasticizer is liable to impair the stability of the resin emulsion, so it is better not to use it if possible.

The elastic compound layer thus obtained is easily deformed even when a heavy load passes through it,
Since it has elasticity (elongation rate, flexural modulus) that can be recovered, it does not crack or peel off and has good mechanical strength. In addition, it adheres closely to a rough substrate surface. There is no need to stabilize by rolling.

As the constituent resin of the synthetic resin emulsion, from the viewpoint of water resistance, weather resistance, and adhesive strength between aggregates,
It is preferable to use an olefin resin, an acrylic resin, a copolymer resin thereof, or a rubber resin. Specifically, as olefin resins, VAc (vinyl acetate resin; trade name "Bond" manufactured by Konishi Co., Ltd.), which has good elasticity, and vinyl acetate resin modified with ethylene E
VA resin (ethylene-vinyl acetate copolymer resin; trade name "Sunflex" manufactured by Kuraray Co., Ltd.) is preferable,
As the acrylic resin, an acrylic ester resin using an ethyl group, a methyl group, a butyl group or a 2-ethylhexyl group as an ester substituent, for example, AcSt resin (acrylic-styrene copolymer resin; manufactured by Mitsubishi Chemical BSF Corporation). Product name of "Acronal S-400"
And the like), and the rubber resin is preferably SBR (styrene-butadiene rubber; trade name "Tomac Super" manufactured by E-Tech Co., Ltd.) having good water resistance. A resin emulsion is prepared by dispersing these resins in water as polymer particles by emulsion polymerization.

Next, an example of the composition of the elastic compound layer according to the present invention is shown in Table 1 below, and in Table 2 below, when various synthetic resins are compounded according to Table 1, (1) Composition of synthetic resin emulsion The characteristics of the elongation of the resin itself, (2) the elongation of the elastic compound layer after dry curing, and (3) the compressive strength of the elastic compound layer after dry curing are shown. In addition, in Table 1, the sand and the constituent resin of the synthetic resin emulsion are 1: 1.
It is blended in a weight ratio of.

[0020]

[Table 1]

[0021]

[Table 2]

Particularly when it is desired to be able to follow the deformation of a soft underlayer, it is preferable that the resin emulsion contains the acrylic resin as a resin component to improve the tackiness.

Further, Table 3 below shows an example of a compound of another elastic compound according to the present invention. As the constituent resin of the synthetic resin emulsion, those shown in Table 2 were used.
At this time, the viscosity of the elastic compound immediately after compounding and before drying and curing was 10,000 to 40,000 cps (centipoise) in an environment of 20 ° C. This viscosity value was suitable for easily applying the elastic compound with a trowel or rake rod.

[0024]

[Table 3]

Next, the underlayer suitable for the elastic compound layer according to the present invention will be described below. As the constituent material of the underlayer, concrete, asphalt concrete, synthetic resin foam, waterproof layer, wood, iron, crusher run and the like can be used. An example of the structure of a preferable underlayer is shown in FIGS.

The underlayer 10 shown in FIG. 3 is provided with a layer 11 of calculus having a diameter of about 64 to 256 mm on a paved base (not shown), and the layer 11 of calcified stone is uniformly applied to the paved base. Layer 12 consisting of a mixture of crusher run such as cut crushed stone obtained by crushing rock or cobblestone for transmitting load with a crusher, and earth and sand
Is provided and this layer 12 is rolled and leveled using a roller or the like. In addition, the underlayer 13 shown in FIG. 4 is obtained by rolling and leveling the sand layer 14 and then providing a layer 15 made of a mixture of crusher run and earth and sand. An emulsion is sprinkled and the mixture is resin-bonded to each other. The underlayer 16 shown in FIG. 5 is a mixture 17a of wood, iron plate, rock, etc.
Are connected to each other using concrete 17b. Asphalt concrete may be used instead of this concrete 17b. The underlayer 18 shown in FIG.
A waterproof layer 20 made of styrene foam or the like is provided on the concrete layer 19. In FIG. 6B, a synthetic resin foam layer 21 made of urethane foam or the like is further provided on the waterproof layer 20 shown in FIG. 6A. For example, such an underlayer can be used for the purpose of waterproofing and heat insulation, or on the floor surface of a rooftop parking lot or the like. And Figure 7
The underlayer 22 shown in is the asphalt concrete layer 23 in which the missing portion 23a is generated. The elastic compound layer is bonded to the base layer without peeling or the like even in such a missing portion.

In order to prevent the elastic compound layer from being buried, the boundary surface between the underlayer and the elastic compound layer is
It is preferable to provide a relatively lightweight mesh reinforcement.
As the reinforcing body, materials such as metal, glass fiber, synthetic resin and carbon fiber can be used.

Next, FIGS. 8A and 8B show another embodiment of the pavement according to the present invention. (a) is the figure which looked at this Example from the upper part, (b) is the schematic sectional drawing. In the pavement of this example, the columnar objects 25 such as logs are arranged on the underlayer 24 as described above, and the elastic compound layer 26 according to the present invention is provided between the columnar objects 25 ,. It was formed. A pavement with good water permeability can be obtained by appropriately selecting the aggregate, and a pavement that does not impair the surrounding landscape can be obtained by appropriately selecting the size and material of the columnar object. It will be possible.

A pavement having a desired surface color can be obtained by mixing the elastic compound layer with a milk for infiltration such as a color cement milk or by mixing sand having a color component.

When the curing conditions of the elastic compound are poor due to bad weather in winter, the surface thereof is heated with a burner or the like, or cement powder, quick lime powder or the like is thinly spread on the surface. Its drying and curing can be promoted.

[0031]

EXAMPLES Preferred examples of the pavement according to the present invention will be described in detail below.

(Example 1) As a base layer, a crusher run having a thickness of 10 cm was laid on the ground, and a vinyl acetate resin emulsion (water content of which was adjusted to 50% by weight) was formed on the surface of the layer rolled by a roller ( "Bond H-17"; Konishi Co., Ltd.
It is sprinkled with 1 kg per square meter and dried. For the elastic compound, 100 parts by weight of river sand (average particle size: 2 to 5 mm) was added to an acrylic-styrene copolymer resin emulsion (“Acronal S-40”).
0 "; manufactured by Mitsubishi Chemical BSF Co., Ltd.) and 15 parts by weight of Portland cement and 7.5 parts by weight of which were mixed and kneaded. Then, on the underlayer, a thickness of 2 cm, a width
Two iron plates 4 cm in length and 3 m long are placed in parallel at an interval of 2 m, and the elastic compound is poured onto the underlying layer between these iron plates and applied by rubbing with a flat plate to give a thickness of
A 20 mm elastic compound layer was formed. After the elastic compound layer was left to cure for 1 day and then cured, its physical properties were measured to find that it had a compressive strength of 80 kgf / cm ² and an elongation of 200%, and deformed as if it were asphalt concrete on the underlayer crusher run. Did not occur.

On the elastic compound layer of this embodiment, 500 g to 1000 g of river sand (particle size 1
It was very easy to walk. Further, when 1000 g of silica sand (No. 5 to 6) per square meter was spread on the elastic compound layer of this example,
A pavement suitable for use in tennis courts and schoolyards, which is less likely to be damaged even if it falls, was obtained. For use in a gateball field, it was suitable to sprinkle 2000 to 4000 g of the silica sand (No. 5 to 6) per square meter.

(Example 2) In the base layer, the unevenness of the existing ground surface was corrected and grounded, and a reinforcing net was laid on the surface of the layer compressed by the rammer to adjust the water content to 50%. An ethylene-vinyl acetate copolymer resin emulsion (“Sunflex”; manufactured by Kuraray Co., Ltd.) was sprinkled at 1 kg per square meter and dried. For the elastic compound, 15 parts by weight of river sand (average particle size: 2 to 5 mm) with acrylic-styrene copolymer resin emulsion (“Acronal S-400”; manufactured by Mitsubishi Kagaku BSF) was used. 3 parts by weight of Portland cement was mixed and kneaded. Then, the elastic compound was poured on the base layer and leveled with a plaster to form an elastic compound layer having a thickness of 20 mm. After the elastic compound layer was left to cure for 2 days and then cured, its physical properties were measured, and the compression strength was 50 kgf / cm ² ,
The elongation was 200%, and it did not deform by conforming to the underlayer.

When 1 kg of silica sand (Nos. 5 to 6) per square meter was spread on the elastic compound layer of this example, the surface slippage was good, and the cushioning property,
An elastic pavement suitable for a ground contact surface of a playground swing with improved shaving was obtained. By covering the base concrete with the elastic compound layer of this example, an elastic pavement having a natural sandy feeling that softens the impact at the time of falling and is in harmony with the surroundings was obtained.

[0036]

As described above, according to the elastic pavement of the present invention, the resin emulsion and the sand having the average particle size adjusted to 0.1 to 15.0 mm are provided on the underlayer composed of the crusher run or the mixture of the crusher run and the earth and sand. Mainly composed of aggregate made of stone , 3 to 50 parts by weight of resin emulsion is mixed with 100 parts by weight of the aggregate, and 100% or less of the amount of the resin emulsion is mixed with cement to obtain elasticity. Since the compound layer is formed and the elongation percentage of the elastic compound layer after drying and curing is set within the range of 10 to 200% and the layer thickness within the range of 5 to 50 mm, the burden on the legs and waist of the human body Therefore, it is possible to obtain a flexible elasticity suitable for exercising the vehicle and to obtain mechanical strength that can withstand the passage of a large vehicle. Further, in the past, the idea that the underlayer of the pavement had to be stabilized was predominant and practical, but the elastic pavement of the present invention has a rough surface with large unevenness It is capable of forming an elastic compound layer that adheres closely to the ground.

Further, an aggregate having an average particle diameter of 0.1 to 15.0 mm is used, and further, 3 to 50 parts by weight of a resin emulsion is mixed with 100 parts by weight of the aggregate, and a cement is mixed in an amount of the resin emulsion. By blending 100% or less of the above, good adhesion with the underlying layer, less likely to cause gaps and peeling between layers, excellent in durability, and in addition to the above-mentioned flexible elasticity and mechanical strength, water permeability It is possible to obtain an elastic pavement that can be provided with good balance.

Further, by using olefin resin emulsion, acrylic resin emulsion or rubber resin emulsion as the resin emulsion, the adhesive force between the aggregates becomes 3 to 15 times that of the conventional one, and water resistance and It is possible to obtain an elastic pavement having improved weather resistance and significantly improved durability of the pavement.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of an elastic pavement according to the present invention.

FIG. 2 is a schematic cross-sectional view showing another embodiment of the elastic pavement according to the present invention.

FIG. 3 is a schematic cross-sectional view showing an embodiment of a base layer according to the present invention.

FIG. 4 is a schematic sectional view showing an embodiment of a base layer according to the present invention.

FIG. 5 is a schematic sectional view showing an embodiment of a base layer according to the present invention.

FIG. 6 is a schematic sectional view showing an embodiment of a base layer according to the present invention.

FIG. 7 is a schematic sectional view showing an embodiment of a base layer according to the present invention.

FIG. 8 is a schematic sectional view showing an application example of the elastic pavement according to the present invention.

[Explanation of symbols]

1 Elastic pavement 2 Paved base 3 Underlayer 4 Elastic compound layer 5 Elastic pavement 6 Elastic compound layer 7 Underground 8 Underlayer 10 Underlayer 11 Kuriishi layer 12 Layers of crusher run or earth and sand 13 Underlayer 14 Sand layer 15 Crusher run or Layer of earth and sand 16 Underlayer 17a Mixture of wood, iron plate, rock, etc. 17b Concrete 18 Underlayer 19 Concrete layer 20 Waterproof layer 21 Synthetic resin foam layer 22 Underlayer 23 Asphalt concrete layer 23a Missing part 24 Underlayer 25 Columnar object 26 Elastic compound layer

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isamu Miyatake 5-35-409, Onohara East, Minoh City, Osaka Prefecture (35) -409 (72) Inventor Fujio Iwata 1-14-2, Karigigaoka, Hirakata-shi, Osaka 4 Karigigaoka Housing 4 -203 (56) Reference JP-A-63-289101 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E01C 7/30 C08K 3/00 C08L 9/08 C08L 23/00 C08L 33/04

Claims (6)

(57) [Claims] 1. A resin emulsion and an aggregate made of sand stone whose particle size is adjusted to an average particle size of 0.1 to 15.0 mm on a base layer made of crusher run or a mixture of crusher run and earth and sand. The resin emulsion is mixed with 3 to 50 parts by weight of 100 parts by weight of the aggregate, and 100% or less of cement is mixed in the resin emulsion to form an elastic compound layer. Of the water is evaporated or the cement is hydrated with the water to remove the water and the aggregates are bonded to each other with a synthetic resin binder, and the elongation of the elastic compound layer is 10 to 200. %, And the layer thickness is set within the range of 5 to 50 mm. 2. The water content of the resin emulsion is
The elastic pavement according to claim 1, which is 40 to 60% by weight . 3. An olefin as the resin emulsion
Type resin emulsion, acrylic type resin emulsion
A rubber-based resin emulsion as claimed in claim 1 or 2.
The elastic pavement described . 4. An adhesive resin as the resin emulsion
The elastic pavement according to claim 3, wherein an emulsion is used . 5. A boundary between the underlayer and the elastic compound layer
The elastic pavement according to any one of claims 1 to 4 , wherein a net-like reinforcing body is arranged at the interface . 6. A columnar object is provided on the base layer.
The elastic compound layer is formed between the columnar objects.
The elastic pavement body according to any one of claims 1 to 4 .