JP2529801B2 - Method for manufacturing improved permeable concrete pavement - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to a method of making improved permeable concrete pavements.

[0002]

2. Description of the Related Art In recent years, as the trend toward urbanization has progressed, the adverse effects thereof have become remarkable in various fields.
Blocking the penetration of water into the ground by pavement such as asphalt pavement and concrete pavement is one of them, which causes a rapid decrease in groundwater, resulting in land subsidence, slowing down the growth of trees, and ecology of underground organisms. If changes occur and intensive rainfall occurs in a short period of time, even if the total amount is not so large, rainwater overflows in the pavement area, causing a serious social problem.

Therefore, in order to avoid such inconvenience, water permeable asphalt pavement has been adopted. However, water-permeable asphalt pavement has problems such as insufficient water permeability and water retention, softening of asphalt due to sunlight and easy clogging of voids that contribute to water permeability, and significant deterioration of the asphalt over time. , A water-permeable concrete pavement excellent in water permeability and water retention produced by using cement instead of asphalt has been developed (JP-A-59-206502).

However, this permeable concrete pavement is
There is a problem that solid particles such as dust and dust are fitted into the through holes in the surface layer that contribute to water permeability, and the water permeability is gradually lowered. On the other hand, the surface of a predetermined hardened cement concrete mixture is manufactured by shot blasting with a polishing machine that is a known machine, and a pavement surface that is excellent in appearance utilizing the natural color of aggregate or the color of makeup aggregate. A water-permeable cement concrete slab with
157302).

However, according to the treatment by the shot plast method, the iron balls or sand used enter the voids that contribute to water permeability and impair the water permeability, and when iron balls are used, the iron that could not be recovered is used. By rusting the ball,
The aesthetics of the pavement surface are severely impaired. In addition, since cement mortar that has adhered to the recesses on the surface of the aggregate and hardened cannot be peeled off, the color of the aggregate is not sufficiently expressed, and the surface of the aggregate is damaged by the collision of the iron balls and sand used. However, it is not possible to obtain a finish that uses the appearance of the aggregate as it is. Also, in rainy weather, the recovery efficiency of iron balls is low, and it is difficult to reuse wet iron balls, resulting in poor construction efficiency. further,
The shot blast method has a problem in that the end of the pavement cannot be processed and a uniform finished surface cannot be obtained.

[0006]

Therefore, a water-permeable concrete pavement having a pavement surface that retains sufficient water permeability for a long time and has an excellent aesthetic appearance by utilizing the natural color of the aggregate or the color of the makeup aggregate. It has been desired to develop an improved method that can be easily manufactured without impairing water permeability and aesthetics.

[0007]

Therefore, as a result of earnest research to solve the above problems, the present inventor has found that (1) the surface of a conventional permeable concrete pavement is
When super high pressure water having a pressure of 000 to 2,800 kgf / cm ² is sprayed to separate the cement covering the aggregate in the surface layer, the water permeability of the cement does not decrease but rather increases significantly, and Even if solid particles such as dust and dust fit in the voids, clogging is less likely to occur because they are removed through the voids by rainwater, etc., so that high water permeability is maintained for a long time, (2) 1 When ultra-high pressure water having a pressure of 1,000 to 2,800 kgf / cm ² is used, the cement mortar hardened by adhering to the recesses on the surface of the aggregate can be peeled off and the color of the aggregate can be sufficiently expressed, Since the surface of the material is not scratched, a finish that retains the appearance of the aggregate can be obtained. (3) Because high pressure water is used without using iron balls, rust does not impair the appearance. thing (4) The pressure of the super high pressure water can be easily adjusted according to the hardness of the cement paste and the thickness of the cement coating, and the construction efficiency can be increased by about 50%. (5) By using the super high pressure water, the pavement edge can be improved. It has been found possible to process parts.

The present invention has been made on the basis of the above findings, and provides an improved permeable concrete pavement, that is,
Manufactures water-permeable concrete pavements that have sufficient water permeability for a long time and have an aesthetically pleasing pavement surface that utilizes the natural color of aggregate or the color of makeup aggregate without impairing water permeability and aesthetics. For the purpose of providing the method, per 1 m ³ , cement 300 to 400 kg, relative to 1 part by weight of cement, 0.008 to 0.04 parts by weight of binder and 0.3 to 0.45 parts by weight of water, and 5:95. Aggregate consisting of sand and crushed stone No. 7 or gravel with a particle size range of 5-10 mm in a weight ratio of ~ 20: 80
1,000 on the surface of a water-permeable concrete pavement made by curing a concrete mix composition consisting of 1790-2150 kg.
Characterized in that the hardened cement mortar covering the aggregate in the surface layer is peeled off by spraying ultra high pressure water having a pressure of ˜2,800 kgf / cm ² .
The present invention relates to a method for manufacturing a water-permeable concrete pavement with improved water permeability.

As cement, it is possible to use, for example, normal or early strength Portland cement, blast furnace cement or silica cement, preferably normal or early strength Portland cement, particularly preferably normal Portland cement. The amount of cement is 300-400 kg, preferably 320-, per 1 m ^{3 of the} concrete mixture composition.
It is 370 kg. If the amount of cement is less than 300 kg, the strength will be insufficient, while if it is more than 400 kg, the strength will increase but the water permeability will decrease. Therefore, in the present invention, 300 to 40 per 1 m ^{3 of the} concrete composition composition.
It was set to 0 kg.

The binder is used to increase the bonding force between the aggregates.
In addition to the conventionally known effects such as the reduction of the dry shrinkage of the concrete or the improvement of the workability by improving the consistency, it also has the effect of improving the water permeability of the concrete. That is, the binder smoothes the surface of the cement mortar layer covering the aggregate, and when the water passes through the voids of the concrete, the foaming phenomenon caused by the bubbles contained in the water is suppressed and the permeability of the water is impeded. And the binder facilitates the formation of continuous voids inside the water-permeable concrete, thereby increasing the void ratio, that is, the continuous void ratio.

As the binder, all binders usually added to cement mortar can be used,
For example, a natural or synthetic rubber such as SBR (styrene butadiene rubber) or NBR (butadiene acrylonitrile rubber), an acrylic resin, an epoxy resin, or the like can be used.
It is usually added in the form of an emulsion. Examples of the emulsion include JSR Tomac Super containing SBR latex binder (Nippon Synthetic Rubber Co., Ltd .: emulsion with solid content of 45%) and acrylic binder X-5142 (manufactured by ACRL Co., Ltd.).
There is. When using JSR Tomac Super 10
The bending strength is improved by about 60%, and when X-5142 is used, the bending strength is improved by about 60 to 90%.

The amount of the binder is 0.008 to 0.04 part by weight, preferably 0.01 per part by weight of the cement.
5 to 0.03 parts by weight. Binder amount 0.00
If it is less than 8 parts by weight, sufficient strength cannot be obtained, while if it is more than 0.04 parts by weight, the water permeability becomes poor. Therefore, in the present invention, it is 0.0 per 1 part by weight of cement.
It was defined as 08 to 0.04 parts by weight.

The amount of water is 0.
3 to 0.45 parts by weight, preferably 0.35 to 0.40 parts by weight. When the amount of water is less than 0.3 parts by weight, sufficient mixing cannot be achieved, while when it is more than 0.45 parts by weight, water permeability becomes poor. It was determined to be 0.45 parts by weight.

As the sand, commonly used sand such as natural sand, artificial sand, and screening sand is used. The weight ratio of the sand and the aggregate of the crushed stone No. 7 or the gravel having a particle size range of 5 to 10 mm is 5:95 to 20:80, preferably,
It is 10:90 to 15:85. If the amount of sand is smaller than the lower limit, the strength becomes too small, while if it is larger than the upper limit, the water permeability becomes poor. Therefore, in the present invention, the weight ratio of sand to crushed stone No. 7 or gravel having a particle size range of 5 to 10 mm is used. Was defined as 5:95 to 20:80.

Also, a part of the above-mentioned aggregate, preferably 10
No. 6 crushed stone may be used instead of -30 wt%. In this case, the strength is further increased. In addition, No. 7 crushed stone refers to single-grained crushed stone with a grain size range of 5 to 2.5 mm
No. 6 crushed stone refers to single-grain crushed stone having a particle size range of 13 to 5 mm. The amount of the aggregate is an amount which is 1 m ³ when kneaded with the above-mentioned predetermined amount of cement, binder and water,
Generally, 1 m ^{3 of} concrete composition is 1
It is 790 to 2150 kg. The amount of sand is generally
179 to 232 per 1 m ^{3 of the} concrete composition composition
kg, and the amount of crushed stone No. 7 is generally 1520 to
It is 1940 kg.

Further, the concrete mixture composition comprises
Conventional additives, such as red iron oxide, chromium oxide (green)
Various colorants such as can also be added. In the present invention, the concrete compounding composition is obtained by combining predetermined amounts of cement, binder, water and aggregate, preferably first mixing water, cement and binder, and then adding aggregate.

Concrete pavement is made by curing the concrete mix composition. For example, first, the concrete mix composition is transported to the site by a truck mixer or a dump truck. Then, asphalt finisher is used for leveling and compaction (by vertical movement of tamper and vibration of screed). By using the asphalt finisher, it is possible to manufacture a concrete pavement having high water permeability and water retention without crushing voids, particularly continuous voids. Further, with such a pressing force, the cracking phenomenon of the aggregate hardly occurs, and the concrete pavement having high water permeability and strength can be manufactured. The compacted concrete pavement is cured and cured.

Ultra-high pressure water sprayed on the surface of a water-permeable concrete pavement in order to exfoliate the hardened cement mortar covering the aggregate is generally:
1,000~2,500kgf / cm ^2, preferably 1,500~2,800kgf / cm ^2, particularly preferably used those having a pressure of 2,000~2,500kgf / cm ^2. High pressure, eg 2,500k
When the gf / cm ² ultra-high pressure water is sprayed, the hardened cement mortar covering the aggregate is peeled off and the ridge angle of the aggregate can be rounded. By rounding the ridge angles of the aggregate, the surface becomes smooth and the foaming phenomenon caused by the bubbles contained in the water when flowing flows is suppressed, so the water permeability is further improved, and more dust and dirt, etc. It becomes difficult for the solid particles to be inserted, and the water permeability is maintained for a longer time.

The amount of water sprayed onto the pavement surface is generally 1
It is 0 to 21 liters / minute, preferably 20 liters / minute. It is preferable that the ultra-high pressure water is sprayed onto a pavement surface by a special nozzle. Examples of the device for providing ultra-high pressure water include Leitan Remover (registered trademark) manufactured by Flow Co. and Jetpack (registered trademark) manufactured by Flow Co.

The water permeability of the improved permeable concrete pavement produced according to the present invention is 3 × 10 ^{-1 to} 5 × 1.
0 ^-1 cm / sec, and the ratio of the voids is 15 to 25
%. The compressive strength of the water-permeable concrete pavement according to the present invention (4 week strength, 20 ° C. constant temperature water curing) is 10
0 to 200 kg / m ² , and bending strength (4 week strength, 2
Curing in constant temperature water at 0 ° C.) is 20 to 30 kg / m ² .

[0021]

EXAMPLES The present invention will be described in more detail with reference to the following examples, which should not be construed as limiting the invention. Example 1 Per m ^{3 of} water-permeable concrete composition having the following composition: Portland cement 330 kg Binder 12 kg and water 105 kg, and 1970: kg aggregate of sand and crushed stone 7 in a weight ratio of 10:90. , Laid with an asphalt finisher, and compacted by vertical movement of the tamper and vibration of the screed. The water permeability of the obtained water-permeable concrete pavement (height 10 cm) was 3 × 10 ⁻¹ cm. The porosity is 22% and the compressive strength is 135k.
The g / m ² and flexural strength were 28 kg / m ² .

Then, using a Leitan remover,
The hardened cement mortar covering the aggregate in the surface layer was peeled off by spraying the atomized ultra-high pressure water at a pressure of 2,500 kgf / cm ² onto the pavement surface in an amount of 21 l / min. By spraying the ultra-high pressure water twice, a finished surface equivalent to or better than that of conventional shot blasting was obtained, and the construction efficiency increased by 50%. The peeled cement mortar was immediately recovered by, for example, the method described in Japanese Patent Application No. 1-271757.

The water permeability of the obtained water permeable concrete pavement was 6 × 10 ^-1 . The porosity is 26%
Met.

[0024]

According to the present invention, there is provided a water-permeable concrete pavement having a pavement surface which retains sufficient water permeability for a long time and has an excellent aesthetic appearance by utilizing the natural color of the aggregate or the color of the makeup aggregate. Provided.

Claims (1)

(57) [Claims] 1. Cement 300 to 400 kg per 1 m ^{3 of} cement, 1 part by weight of cement, 0.008 to 0.04 parts by weight of binder and 0.3 to 0.45 parts by weight of water, and 5:95 to 20:80. Aggregate composed of sand and crushed stone No. 7 or gravel having a particle size range of 5 to 10 mm in a weight ratio of
1,000 on the surface of a water-permeable concrete pavement made by curing a concrete mix composition consisting of 1790-2150 kg.
Characterized in that the hardened cement mortar covering the aggregate in the surface layer is peeled off by spraying ultra high pressure water having a pressure of ˜2,800 kgf / cm ² .
Method of making improved permeable concrete pavement.