JP2869458B2 - 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 used for athletic facilities such as a track in a stadium, a sidewalk, and more particularly to a pavement having a structure in which aggregates are combined with a resin binder.

[0002]

2. Description of the Related Art The above-mentioned pavement has excellent water permeability, and uses colored aggregate and resin binder.
It has the advantage that it can be colored freely. As the pavement, rubber chips bonded with a resin binder,
In addition, those obtained by bonding hard aggregates such as ceramic particles with a resin binder are generally known.

In the former pavement having a structure in which rubber chips are bonded with a resin binder, the hardness of the floor or the like is expressed by the maximum acceleration (a _max : G) that the head receives when the head is knocked over. , Research by Professor Hidetoshi Ono, Tokyo Institute of Technology [for example,
"Study on elasticity of gymnasium floor (Part 5)" Architectural Institute of Japan Transactions, 227, 1975, hereinafter referred to as "Ono-type fall hardness"]. Due to its high elasticity, it is extremely unlikely to cause a fatal accident even if the user strikes the head during a fall, and is excellent in safety. It is widely used in sports facilities such as stadium tracks.

[0004] On the other hand, the latter pavement having a structure in which hard aggregates such as ceramic particles are bonded with a resin binder has higher strength and superior abrasion resistance than pavements containing rubber chips, and is mainly used for sidewalks and open spaces. Used in

[0005]

However, pavement having a structure in which rubber chips are bonded with a resin binder has low strength,
In particular, there is a problem that the rubber chips are easily peeled off due to shear stress or the like applied to the surface of the pavement. Further, when the pavement is used for a sidewalk or the like, there is a problem that it is too soft to walk.

Also, pavement having a structure in which hard aggregate is bonded with a resin binder is hard, so that it has a strong impact on the feet and knees, and is not suitable for jogging or long-time walking. Is over 100G, and there is a high risk that a fatal accident may occur if the user smashes the head during a fall. Recently, the ratio of the soft elastic aggregate to the total aggregate of the hard aggregate and the soft elastic aggregate such as a rubber chip is 25 to 7%.
A pavement having a structure in which it is blended so as to be within a range of 5% by volume and which is combined with a resin binder has been proposed (Japanese Patent Application Laid-Open No. 63-63)
-7404).

However, in the above-mentioned pavement, for example, when the thickness of the layer is as thin as about 20 mm or less, if the proportion of the hard aggregate exceeds 50% by volume, the elasticity becomes insufficient.
There is a problem that the maximum acceleration due to the Ono-type falling hardness exceeds 100 G, and the risk of falling is increased. The present invention
The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a new pavement capable of solving the above-mentioned drawbacks of each pavement.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the elastic pavement of the present invention comprises a hard aggregate on a lower layer made of a soft elastic aggregate and a resin binder sufficient to bind the soft elastic aggregate. A surface layer comprising soft elastic aggregates and a resin binder sufficient to bind these aggregates, wherein a ratio of the soft elastic aggregates in the total aggregate is within a range of 10 to 60% by volume. I do.

In the elastic pavement of the present invention having the above structure, the lower layer is a resin mortar for the lower layer obtained by mixing a soft elastic aggregate with a resin binder before hardening, and the lower layer is laid on a base using a gold iron or the like. It is formed by applying and curing a resin binder. In addition, the surface layer is a resin mortar for the surface layer obtained by mixing the soft elastic aggregate and the hard aggregate with the resin binder before curing, is applied on the lower layer using a gold iron or the like, and the resin binder is cured. Is formed.

As a base on which the lower layer is applied and formed, the surface of concrete pavement or asphalt pavement is good.
On these surfaces, preferably via a primer layer,
A resin mortar for the lower layer is applied. The thicknesses of the lower layer and the surface layer are not particularly limited, but it is preferable that each thickness is 3 mm or more and the total thickness is 20 mm or less. When the thickness of the lower layer and the surface layer is less than 3 mm, it is difficult to apply the coating, and not only may not obtain a continuous coating film, but also the maximum acceleration by the Ono-type tipping hardness exceeds 100 G, Danger may increase. On the other hand, if the total thickness exceeds 20 mm, it may be too soft to make it difficult to walk, and a large amount of resin mortar is required, which is not economical.

The porosity of each of the lower layer and the surface layer is preferably in the range of 10 to 40%. If the porosity of the lower layer and the surface layer is less than 10%, the water permeability decreases, the drainage becomes poor, and the water accumulated on the surface may cause a fall accident. If the porosity exceeds 40%, the strength of the lower layer and the surface layer may be reduced. In the surface layer, the ratio of the soft elastic aggregate to the total aggregate is 10%.
The reason for being limited within the range of ６０60% by volume is as follows.

That is, if the proportion of the soft elastic aggregate in the total aggregate is less than 10% by volume, the surface layer becomes too hard, cannot follow the deformation of the lower layer when a load is applied, and the surface layer breaks. And peeling off from the lower layer.
On the other hand, the ratio of the soft elastic aggregate in the total aggregate is 60% by volume.
If the number exceeds the limit, the surface layer becomes too flexible, which causes a problem that it is difficult to walk.

Therefore, in the surface layer, the proportion of the soft elastic aggregate in the total aggregate is limited to the range of 10 to 60% by volume. As the soft elastic aggregate contained in the lower layer and the surface layer, a natural or synthetic rubber material or a granular material made of a soft and elastic synthetic resin material such as foamed polyurethane can be used. Chips made of waste plastic and synthetic resin materials, from the viewpoint of resource reuse,
It is preferably used.

Although the hardness of the soft elastic aggregate is not particularly limited, JIS K6301 "Vulcanized Rubber Physical Test Method"
It is preferable that the spring hardness Hs (JIS A) is 70 or less according to a spring-type hardness test (A type) specified in JIS. When the spring hardness Hs (JIS A) exceeds 70, the lower layer and the surface layer become too hard, and the maximum acceleration by the Ono-type overturning hardness exceeds 100 G,
The risk of falling may increase.

The particle size of the soft elastic aggregate is not particularly limited, but is preferably in the range of 0.3 to 5 mm. When the particle size of the soft elastic aggregate is less than 0.3 mm, the porosity of the lower layer and the surface layer described above cannot be sufficiently secured, and the water permeability of the elastic pavement may be insufficient. On the other hand, when the particle size of the soft elastic aggregate exceeds 5 mm, the finished surface of the elastic pavement may not be uniform. As the hard aggregate contained in the surface layer together with the soft elastic aggregate, natural stone, silica sand, artificial stone, slag, ceramic balls, ceramic particles, plastic particles and the like can be used.

The hardness of the hard aggregate is not particularly limited, but is preferably 90 or more in terms of the spring hardness Hs (JIS A). Spring hardness Hs (JIS
If A) is less than 90, the lower layer and the surface layer may be too soft, making it difficult to walk. Regarding the particle size of the hard aggregate, for the same reason as in the case of the soft elastic aggregate, 0.3
Preferably it is in the range of 〜5 mm.

In the surface layer, the soft elastic aggregate and the hard aggregate are combined, and in the lower layer, the resin binder for binding the soft elastic aggregate is, for example, polyurethane resin, soft epoxy resin, peroxide-crosslinked acrylic resin. resin,
Various curable resin materials having excellent weather resistance and water resistance, such as a soft polyester resin and an asphalt emulsion, can be used. In particular, a moisture-curable polyurethane is preferably used. Since the moisture-curable polyurethane is supplied as a single agent, there is no need for labor such as measurement and the like, and since it is naturally cured by moisture, the curing operation is easy and the hardness of the surface layer and the lower layer is affected. There is an advantage that a cured product having excellent flexibility can be obtained without fear.

The above resin binder may be mixed in an amount sufficient to bind the aggregate in both the lower layer and the surface layer, and the mixing ratio is not particularly limited. In a ratio, a resin binder in an amount of 1/6 to 1/3 of the total amount of the aggregate (the amount of the soft elastic aggregate in the case of the lower layer, and the total amount of the soft elastic aggregate and the hard aggregate in the case of the surface layer) is blended. Preferably.

When the amount of the resin binder to the total amount of the aggregate is 1
If it is less than / 6, the adhesiveness of the aggregate by the resin binder may decrease, and the strength of the lower layer and the surface layer may decrease. If the amount of the resin binder with respect to the total amount of the aggregate exceeds 1/3, the resin mortar becomes sticky. May be too high, making application difficult. In addition, the soft elastic aggregate, the hard aggregate and the resin binder are blended, for the lower layer and the surface resin mortar, if necessary, further,
Additives and solvents such as coloring agents, thickeners, defoamers, wetting agents,
You may mix | blend suitably quantity.

[0020]

According to the elastic pavement of the present invention having the above structure, when a weak compressive force such as walking is applied, a relatively hard surface layer containing soft elastic aggregate and hard aggregate is formed. Since it is mainly subjected to a compressive force, a hardness suitable for walking can be obtained. On the other hand, when a large impact is applied, such as when falling, the surface layer flexes widely, and the highly elastic lower layer containing the soft elastic aggregate is mainly subjected to compressive force. It is extremely unlikely that a fatal accident would be caused by hitting the head.

Further, the above-mentioned surface layer is excellent in abrasion resistance because it contains a hard aggregate which is hard to wear.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The elastic pavement of the present invention will be described below based on examples and comparative examples. Example 1 A tip made of ethylene-propylene-diene rubber (EPDM) as a soft elastic aggregate (trade name GO manufactured by Sumitomo Rubber Industries, Ltd.)
Chip, average particle diameter of 1 to 3 mm) and a moisture-curable polyurethane binder (Gripcoat C928, trade name, manufactured by Sumitomo Rubber Industries, Ltd.) as a resin binder, mixed at a volume ratio of 4: 1 to form a lower layer. A resin mortar was prepared, and this resin mortar was applied to a polyurethane primer layer (a coating amount of 20) formed on the surface of concrete pavement.
0 g / m ² ), using a gold trowel to spread and apply, and then cured to form a lower layer having a thickness of 5 mm and a porosity of 30%.

Next, a ceramic ball (Daoralex, trade name, manufactured by Nippon Cellaway Development Co., Ltd., average particle size: 0.5 to 3 mm) as a hard aggregate and the EPDM chip were mixed in a volume ratio of 50:50. The above mixture was mixed with the moisture-curable polyurethane binder in a volume ratio of 4: 1 to prepare a resin mortar for a surface layer. The solution was spread, applied and cured to form a surface layer having a thickness of 5 mm and a porosity of 30%, thereby completing an elastic pavement.

Example 2 In a resin mortar for a surface layer, ceramic balls and E
The mixing ratio (volume ratio) with the PDM chip is 75:25.
Elastic pavement was completed in the same manner as in Example 1 except that the pavement was made as described above. Example 3 In a resin mortar for a surface layer, ceramic balls and E
The mixing ratio (volume ratio) with the PDM chip is 40:60.
The elastic pavement was completed in the same manner as in Example 1 except that the thickness of the surface layer was changed to 10 mm.

Example 4 An elastic pavement was completed in the same manner as in Example 1 except that the thickness of the surface layer was changed to 20 mm. Comparative Example 1 A resin mortar was prepared by mixing the EPDM chip and a moisture-curable polyurethane binder at a volume ratio of 4: 1, and this resin mortar was formed on a surface of a concrete pavement. Was spread over a primer layer (application amount: 200 g / m ² ) using a gold iron and applied, followed by curing to form a pavement having a thickness of 10 mm and a porosity of 30%.

Comparative Example 2 A mixture of the ceramic ball and the EPDM chip in a volume ratio of 50:50 was mixed with the moisture-curable polyurethane binder in a volume ratio of 4: 1. A resin mortar is prepared, and the resin mortar is flow-spread using a gold iron on a polyurethane primer layer (coating amount: 200 g / m ² ) formed on the surface of concrete pavement, and cured. Thus, a pavement having a thickness of 10 mm and a porosity of 30% was formed.

Comparative Example 3 A mixture of the ceramic ball and the EPDM chip in a volume ratio of 75:25 was mixed with the moisture-curable polyurethane binder in a volume ratio of 4: 1. A resin mortar is prepared, and the resin mortar is flow-spread using a gold iron on a polyurethane primer layer (coating amount: 200 g / m ² ) formed on the surface of concrete pavement, and cured. Thus, a pavement having a thickness of 10 mm and a porosity of 30% was formed.

Comparative Example 4 A resin mortar was prepared by mixing the ceramic balls and a moisture-curable polyurethane binder at a volume ratio of 4: 1. The resin mortar was formed on the surface of concrete pavement. On a polyurethane primer layer (coating amount: 200 g / m ² ), the solution was spread and applied using a gold iron, and cured to form a pavement having a thickness of 10 mm and a porosity of 30%.

Comparative Example 5 A mixture of the ceramic ball and the EPDM chip at a volume ratio of 40:60 was mixed with the moisture-curable polyurethane binder at a volume ratio of 4: 1. A resin mortar is prepared, and the resin mortar is flow-spread using a gold iron on a polyurethane primer layer (coating amount: 200 g / m ² ) formed on the surface of concrete pavement, and cured. Thus, a pavement having a thickness of 10 mm and a porosity of 30% was formed.

Comparative Example 6 A mixture of the ceramic ball and the EPDM chip at a volume ratio of 50:50 was mixed with the moisture-curable polyurethane binder at a volume ratio of 4: 1. A resin mortar is prepared, and the resin mortar is flow-spread using a gold iron on a polyurethane primer layer (coating amount: 200 g / m ² ) formed on the surface of concrete pavement, and cured. Thus, a pavement having a thickness of 20 mm and a porosity of 30% was formed.

Ono-type Fall Hardness Test The pavement obtained in each of the above Examples and Comparative Examples was subjected to the head method according to the measurement method described in the above-mentioned "Study on Elasticity of Gymnasium Floor (Part 5)". When the model was freely dropped from a height of 20 cm, the maximum acceleration (a _max : G) indicated by the accelerometer attached to the head model was obtained.

Water Permeability Test For the pavement obtained in each of the above Examples and Comparative Examples,
According to the constant water level method described in IS A1218 “Test Method for Permeability of Soil”, water permeability was evaluated as Δ when the permeability coefficient was 10 ⁻² cm / s or more, and as × when less than 10 ⁻² cm / s. Walking Feeling Test 100 subjects were asked to walk on the pavement obtained in each of the above Examples and Comparative Examples, and the walking condition was evaluated in two stages of good and bad. More than people were evaluated as ○, and those below were evaluated as ×.

Abrasion resistance test The pavement obtained in each of the above Examples and Comparative Examples was evaluated for A
STM D1044 “RESISTANCE OF TRANSPARENT PLASTICS TOSURFACE A
BRASION) ", the surface abrasion resistance was measured. The test was conducted using a Taber abra abrasion tester (Taber abra).
ser) and a Taber wear wheel (model number H22)
Were measured under the conditions of a contact load of 1 kg and the number of rotations of the sample of 1,000, and the result was obtained as a decrease in the thickness of the pavement.

Table 1 shows the above results.

[0035]

[Table 1]

From the results shown in Table 1 above, Comparative Example 1, which is a pavement structure including only a conventional rubber chip, has an Ono-type falling hardness of 100 G or less, which is considered dangerous, and has a low risk of falling. It was also found that it had excellent water permeability, but had poor abrasion resistance and was too soft to walk. Further, Comparative Example 4, which is a pavement configuration including only conventional hard aggregates, has an Ono-type overturning hardness of 136 G, which is far above 100 G, which is considered dangerous. It was too easy to put a burden on the legs and knees, and it turned out that it was difficult to walk.

In Comparative Examples 2, 3, 5, and 6, which are conventional pavements containing soft elastic aggregates and hard aggregates, the abrasion resistance and walking feeling were excellent, but the Ono type Since the falling hardness exceeds 100 G, which is considered dangerous, it was found that the risk of falling was high. On the other hand, in Examples 1 to 4, which are configurations of the elastic pavement of the present invention, the Ono-type falling hardness is 100 G or less, which is regarded as dangerous, the risk of falling is small, water permeability, It was found to be excellent in abrasion and easy to walk.

[0038]

Since the elastic pavement of the present invention is constructed as described above, it has high safety at the time of overturning, is easy to walk, and has excellent wear resistance. Therefore, the elastic pavement of the present invention solves all the problems of conventional pavements and can be suitably used as all kinds of pavements such as athletic facilities and sidewalks.

──────────────────────────────────────────────────続 き Continuing from the front page (73) Patent holder 000192844 Shinto Paint Co., Ltd. 6-10-73 Minamitsukaguchi-cho, Amagasaki-shi, Hyogo (73) Patent holder 000105648 Konishi Co., Ltd. Doshu-cho, Chuo-ku, Osaka-shi, Osaka 1-6-10 (73) Patent holder 000183233 Sumitomo Rubber Industries, Ltd. 3-6-9 Wakihama-cho, Chuo-ku, Kobe-shi, Hyogo (73) Patent holder 000006714 Yokohama Rubber Co., Ltd. 5-chome, Shimbashi, Minato-ku, Tokyo, Japan 36-11 (73) Patent holder 591063464 SHOBOND CHEMICAL CO., LTD. 2-2-2 Kanda Jimbocho, Chiyoda-ku, Tokyo (73) Patent holder 000230054 Nippon Paint Co., Ltd. 2-1-2 Oyodokita, Kita-ku, Osaka-shi, Osaka No. (72) Inventor Tetsuya Kunmoto 4-34-16 Kaida, Nagaokakyo-shi, Kyoto (72) Inventor Yoshinori Mori 3816-1, Osone, Tsukuba-shi, Ibaraki Pref. Inside the center (72) Inventor Yasuji Terano 731-1 Yida, Ryuo-cho, Gamo-gun, Shiga Prefecture Sekisui Jushi Co., Ltd. Within the company (72) Inventor Kazunori Shimoda 2-9-6 Hikawacho, Toda City, Saitama Prefecture Evolution within Seiki Co., Ltd. (72) Eiji Takamura 6-10-73 Minamitsukaguchicho, Amagasaki City, Hyogo Prefecture Shinto Paint Co., Ltd. (72) Inventor Yutaka Masuda 5-3-35 Nishibori, Urawa-shi, Saitama Prefecture Within Konishi Co., Ltd. (72) Inventor Toshiya Murayama 950 Nakahara Uemiya, Hiratsuka-shi, Kanagawa Prefecture Yokohama Rubber Co., Ltd. (72) Inventor Saito Hiroshi 4-197, Kashiki-cho, Omiya-shi, Saitama Prefecture Showborn Chemical Co., Ltd. (72) Inventor Junichiro Nagata 19-17 Ikedanakamachi, Neyagawa-shi, Osaka Japan Paint Co., Ltd. (56) References JP-A 49-59433 JP, a) JitsuHiraku flat 5-54604 (JP, U) (58 ) investigated the field (Int.Cl. ^6, DB name) E01C 7/26

Claims (4)

(57) [Claims] A hard aggregate comprising a soft elastic aggregate and a resin binder sufficient to bind the soft elastic aggregate,
A surface layer comprising soft elastic aggregates and a resin binder sufficient to bond these aggregates, wherein a surface layer in which the ratio of the soft elastic aggregates in the total aggregate is within the range of 10 to 60% by volume is laminated. Elastic pavement. 2. The soft elastic aggregate has a spring hardness Hs (JI
The elastic pavement according to claim 1, wherein SA) is 70 or less, and the hard aggregate has a spring hardness Hs (JIS A) of 90 or more. 3. The lower layer and the surface layer each have a thickness of 3
The elastic pavement according to claim 1, wherein the total thickness is not less than 20 mm and not more than 20 mm. 4. The elastic pavement according to claim 1, wherein each of the lower layer and the surface layer has a porosity in the range of 10 to 40%.