JP2004060389A - Water retentive pavement structure and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide water retentive pavement structure capable of providing the surface layer of pavement with water retentiveness and shortening time for water to infiltrate inside from the surface of the surface layer. <P>SOLUTION: In the surface layer of drainable pavement wherein granular aggregate 2 is connected in a state of having a large number of cavities by a binder 3 and solidified, a water retentive filler 4 formed by kneading a nodulizing agent in mortar or cement paste is injected in the cavities of the surface layer and solidified. Cement grains in the water retentive filler 4 are nodulized to form a large number of continuous fine cavities, which results in improving water permeability and also water retentiveness. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a water-retentive pavement used for road pavement that absorbs and retains rainwater, and more particularly to a water-retentive pavement technology that allows rapid penetration of rainwater and less scattering of dust due to abrasion.
[0002]
[Prior art]
Conventionally, on general roads and expressways, by making the road surface permeable, it is possible to prevent the formation of a water film on the road surface due to rainwater, prevent the occurrence of the hydroplaning phenomenon, and have a soundproofing effect Drained pavement is widely used. Such a drainage pavement is formed by mixing an aggregate such as a crusher run and a binder such as asphalt and an asphalt emulsion, and rolling the mixture with a roller on a roadbed with a large number of continuous voids. You.
[0003]
However, the drainage pavement has a surface layer (road surface) that is dry when the weather is fine because rainwater quickly penetrates from the surface layer to the underground. Therefore, there is a problem in summer that the road surface becomes hot due to sunlight irradiation, which causes a heat island phenomenon.
[0004]
Therefore, in recent years, even in road pavement, the surface layer of the pavement is made to have water retention, and rainwater is retained on the surface layer in rainy weather, so that the temperature rise on the road surface is suppressed by the latent heat of evaporation of rainwater retained in fine weather. In many cases, a water-retentive pavement is required.
[0005]
Conventionally, the formation of a water-retentive pavement is based on a drainage asphalt pavement formed by mixing an aggregate and a binder, and rolling the mixture with a roller on a roadbed with a large number of continuous voids. In many cases, a method of injecting a slurry-like water-retentive filler obtained by mixing cement and a porous filler is employed. As such a water-retentive pavement, a water-retentive pavement described in JP-A-10-46513 is known.
[0006]
The water-retentive pavement described in JP-A-10-46513 has a perforated surface layer formed of a porous molded block or the like using a water-permeable asphalt mixture or a water-permeable cement concrete having a void of 15 to 35% by volume. It has a structure in which a silt-based filler having water retention and water permeability is filled in the voids. Further, as the silt-based filler, any one of silt-based powder having a silt content of 5 to 75 μm in particle size of 50% by weight or more, cement-based solidifying agent, water, and a cement-additive or a polymer emulsion is used. Are mixed at a predetermined ratio. In this water-retentive pavement, silt-based filler absorbs rainwater that has poured onto the perforated surface layer (road surface) to retain water.
[0007]
[Problems to be solved by the invention]
However, in the conventional water-retentive pavement, since the particle size of the water-retentive filler filling the voids of the drainage pavement is small, it takes about several seconds for water to penetrate from the surface of the surface to the inside of the surface. For this reason, there is a disadvantage that the amount of water flowing on the surface of the surface layer increases without penetrating into the surface layer during heavy rain, and a sufficient water permeability cannot be exerted. In addition, since the particles of the water-retentive filler are small, the surface of the surface layer is ground and worn by running of an automobile, and the water-retentive filler is scattered as powder dust.
[0008]
Therefore, an object of the present invention is to provide a water-retentive pavement structure that can impart water retention to the surface layer and that has a short time for water to penetrate from the surface to the interior of the surface layer.
[0009]
Another object of the present invention is to provide a water-retentive pavement structure in which the surface layer is hardly ground by an automobile or the like and the dust is less scattered even when the surface layer is ground.
[0010]
It is still another object of the present invention to provide a method for constructing a water-retentive pavement structure in which the surface layer can have water retention and the time for which water permeates from the surface layer surface into the surface layer is short.
[0011]
[Means for Solving the Problems]
The water-retentive pavement structure of the present invention is characterized in that, in the surface layer of a drainage pavement solidified by bonding granular aggregates into a state having a large number of voids with a binder, the voids in the surface layer are aggregated into mortar or cement paste. A water-retentive filler obtained by kneading an agent is injected and solidified. With this configuration, the following operation is obtained.
[0012]
The mortar or cement paste (hereinafter referred to as “mortar or the like”) is added with a granulating agent and kneaded, whereby particles of the mortar or the like are combined to form an aggregate, and these aggregates are further connected. Crosslink to form a three-dimensional network structure. That is, mortar and the like are aggregated. The aggregated mortar or the like is injected into the voids in the surface layer of the drainage pavement and solidified, so that the voids in the surface layer are filled with the aggregated mortar or the like. Since this aggregated mortar has many fine voids, it is excellent in water retention, and since the voids between the particles of the aggregated mortar and the like are continuous, the surface of the surface layer to the inside of the surface layer. Water penetration time is also reduced.
In addition, the aggregated mortar and the like are strongly bonded to each other by the aggregating agent, so that the aggregates of the aggregated particles are hardly separated, and the bonding strength is higher than that of the ordinary cement mortar and the like. strong. Therefore, the surface of the pavement is less likely to be ground by an automobile or the like. Further, even if the surface layer of the pavement is ground, the powder of mortar and the like generated is an aggregate of particles agglomerated by the aggregating agent, and therefore, is hardly scattered and hardly becomes fine dust.
Further, since the voids in the surface layer are filled with the water-retentive filler, pebbles, sand, mud, etc. enter the voids in the surface layer to block the voids, and there is no fear that the water permeability is reduced, and the surface layer is stable. Water permeability and water retention can be maintained for a long period of time.
[0013]
Here, as the “granular aggregate”, natural sand, gravel, crusher run, artificial aggregate and the like are used. As the "binder", asphalt, cement or the like is used. The porosity of the “surface layer of the drainage pavement” is preferably 15% to 35% by volume in terms of maintaining the strength of the pavement. As the “mortar”, a slurry in which water is added to at least cement and sand and kneaded is used. The mixing ratio varies depending on the properties of the cement, and the mortar is mixed at a ratio that maximizes the strength of the mortar. For example, when ordinary Portland cement is used as the cement, the mixing ratio is 200 to 300 parts by weight of sand and 50 to 100 parts by weight of water with respect to 100 parts by weight of cement. Also, to increase the strength of the mortar, pozzolans such as volcanic ash, clay silicate, fly ash, silica fame, blast furnace slag fine powder, mineral powder such as rock powder, swelling agent, AE agent, water reducing agent, AE water reducing agent, etc. May be mixed. In addition, a cement admixture such as an accelerator, a retarder, and a quick-setting admixture may be mixed according to the purpose of construction. As "cement", mixed cement such as blast furnace cement, silica cement or fly ash cement, Portland cement, white cement, color cement, ultra-rapid hardening cement, expanded cement, etc. are used. For this reason, it is preferable to use Portland cement. As the “sand”, natural sands such as sea sand, river sand and mountain sand are used. The particle size of the “sand” is not particularly limited, but it is necessary to easily move in the voids of the drainage pavement surface layer. Therefore, in particular, the one having an average particle size of 0.075 to 0.25 mmφ should be used. Is preferred. As the “aggregating agent”, for example, a polymer compound or the like comprising a complex of a magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine is used. Specifically, for example, trade names “Chemical Buoy”, “GB-2000”, “CG-2000”, etc., manufactured by Global Research Institute, Ltd. are used. The amount of the “agglomerating agent” is not particularly limited, but when using “Chemical Buoy” (trade name, manufactured by Global Research Institute Co., Ltd.) as the aggregating agent, 100 parts by weight of sand is used. It is preferable to add 0.5 to 1.0 part by weight. If the aggregating agent is 0.5 parts by weight or less, the agglomerating action is weak, the generation of voids inside the water-retentive filler becomes incomplete, and conversely, if the aggregating agent is 1.0 part by weight or more, This is because the agglomeration action hardly changes and only the material cost increases.
The average particle diameter of the particles constituting the aggregated water-retentive filler is not particularly limited, but is preferably 0.075 to 2.0 mmφ. If the average particle size is less than 0.075 mmφ, it is difficult to generate voids inside the water-retentive filler, and the permeability of water will be reduced because the width of the voids is reduced, and the average particle size is greater than 2.0 mmφ. This is because if the water retention filler becomes too large, it becomes difficult for the water-retentive filler to penetrate into the voids in the surface layer of the pavement.
[0014]
In the present invention, the aggregating agent may be added in an amount of 0.5 to 1.0 part by weight based on 100 parts by weight of cement contained in the mortar or cement paste.
As described above, by adding the aggregating agent to the sand at the above ratio, an appropriate aggregating action is obtained in the water-retentive filler, and the permeation time of water into the water-retentive filler is shortened. In addition to this, there is an effect that the water-retaining filler easily penetrates into the voids in the surface layer of the pavement.
[0015]
The method of constructing the water-retentive pavement structure of the present invention is characterized in that, in the surface layer of the drainage pavement solidified by bonding the granular aggregate into a state having a large number of voids with a binder, the voids in the surface layer, mortar or cement paste. It has a water-retentive filler injecting step of injecting a water-retentive filler obtained by kneading the aggregating agent, and a solidifying step of solidifying the water-retentive filler injected into the surface layer.
[0016]
By the above process, the water-retentive pavement structure can be constructed simply by filling the existing drainage pavement with the water-retentive filler, so that the construction is easy and the construction cost is low. In addition, the step of removing the existing drainage pavement becomes unnecessary, and no new industrial waste is generated, so that the labor for industrial waste treatment can be reduced. Further, since the above-mentioned steps can shorten the construction period, the traffic regulations can be released earlier.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0018]
The water-retentive pavement structure according to the present embodiment is characterized in that, in the surface layer of the drainage pavement solidified by bonding the granular aggregate into a state having a large number of voids with a binder, the voids in the surface layer are aggregated into mortar. It is formed by injecting and solidifying a water-retentive filler obtained by kneading an agent.
[0019]
FIG. 1 is a sectional view of a water-retentive pavement structure according to an embodiment of the present invention.
In FIG. 1, the water-retentive pavement structure 1 is in a state where a granular aggregate 2 made of crusher run, sand, pebbles, and the like is covered with a binder 3 made of asphalt. In addition, each aggregate 2 is in a state of being bonded and solidified by the bonding material 3. An interconnected gap is formed between each of the aggregates 2 covered with the binder 3, and the gap is filled with a water-retentive filler 4.
[0020]
The water-retaining filler 4 is a kneaded material obtained by kneading a mortar having cement, sand and water with a granulating agent. As the cement, usually Portland cement is used, and the mixing ratio of cement, sand and water is such that the sand is 200 to 300 parts by weight and the water is 70 to 100 parts by weight with respect to 100 parts by weight of cement. ing.
[0021]
As the aggregating agent, "Chemical Buoy" (trade name) manufactured by Global Research Institute, Inc. is used. The mixing ratio of the aggregating agent is 0.5 to 1.0 part by weight based on 100 parts by weight of cement.
[0022]
The water-retentive pavement structure 1 according to the present embodiment is applied to a surface layer of a road pavement.
[0023]
The operation of the water-retentive pavement structure of the present embodiment as described above will be described below.
First, when water is poured onto the surface of the water-retentive pavement structure 1 laid on the surface of the road during rainy weather or water sprinkling, water flows from the surface of the water-retention pavement structure 1 to the water-retention pavement structure 1. It penetrates into the inside of the filler 4. At this time, since the water-retentive filler 4 is a mortar composed of cement, sand and water, which is kneaded by adding the aggregating agent, the cement particles in the mortar are bound by the aggregating agent and aggregated. Are formed and are in an aggregated state. Therefore, fine voids are formed between the aggregates of the cement particles, and the voids are in a state of communicating with each other. Therefore, the permeation time of water from the surface of the water-retentive pavement structure 1 to the inside is also shortened.
[0024]
That is, since the aggregating agent is composed of a polymer compound in which each molecule has a strong positive or negative charge, when mixed with mortar, cement having a polarity opposite to the charge of the aggregating agent is used. It instantaneously combines with particles and sand grains and combines these particles to form an aggregate. Further, these aggregates are connected and cross-linked to form a three-dimensional network structure. Therefore, the three-dimensional network structure thus formed exhibits excellent strength, stability, and durability, and also exhibits high permeability and water retention.
[0025]
Moreover, since the aggregated mortars are strongly bound to each other by the aggregation agent, the aggregates of the aggregated particles are difficult to separate. That is, the aggregated water-retentive filler 4 has a stronger bonding strength of the particles constituting the mortar than the ordinary cement mortar. Therefore, by applying the water-retentive pavement structure 1 to the surface layer of the road pavement, the surface layer of the road pavement is less likely to be ground by the vehicle or the like even when vehicles and the like pass on the road. Further, even if the surface layer of the road pavement is ground, the mortar powder that is generated is a particle aggregate that has been agglomerated by the aggregating agent, so that it is difficult to be scattered and to be fine dust.
[0026]
Next, a method for constructing the water-retentive pavement structure according to the present embodiment will be described with reference to FIGS. In the present embodiment, description will be made assuming that the water-retentive pavement structure 1 is laid on the surface layer of road pavement.
[0027]
FIG. 2 is a sectional view of drainage pavement applied to road pavement.
In FIG. 2, a surface layer 6 is formed on an upper part of a roadbed 5 in which granular aggregates are laid flat, and an upper surface of the surface layer 6 is a road surface. The surface layer 6 is in a state where the aggregates 2 whose surfaces are covered with the binder 3 are laid flat with continuous voids, and the aggregates 2 are firmly connected to each other by the binder 3. . As the aggregate 2, natural sand, gravel, crusher run, artificial aggregate and the like are used. Asphalt and cement are used for the binder 3. The construction method of such a drainage pavement has already been widely performed and is well-known, so that the description thereof will be omitted.
[0028]
Next, after constructing such a drainage pavement, a mixture of a mortar containing cement, sand and water and a granulating agent added thereto is kneaded with a concrete mixer to obtain a slurry-like water-retaining filler. The composition of cement, sand, water, and the aggregating agent and the mixing ratio thereof are as described above, and the description is omitted here.
[0029]
Next, the completed slurry-like water-retaining filler is poured or sprayed on the upper surface of the surface layer 6 of the drainage pavement. The slurry-like water-retentive filler poured or sprayed into the surface layer 6 penetrates into the voids 7 in the surface layer 6.
[0030]
Next, the surface of the drainage pavement into which the slurry-like water-retentive filler has been poured is rolled by a tire roller or a load roller, and the water-retentive filler is sufficiently filled in the voids of the surface layer 6.
[0031]
Then, the water-retentive filler is solidified by leaving the filled surface layer 6 in the air.
[0032]
FIG. 3 is a diagram illustrating a state after the water-retentive filler is filled in the surface layer of the drainage pavement.
[0033]
In FIG. 3, the water-retentive filler 4 is in a state of being filled in the gap between the aggregates 2, whereby the construction of the water-retentive pavement structure is completed.
[0034]
In the present invention, the binder may be asphalt cement, the cement may be Portland cement, silica cement, fly ash cement, and the aggregating agent may be a trade name "GB-2000" or " CG-2000 ", and is not limited to the above-described embodiment.
It is also possible to use a cement paste containing no sand instead of the mortar.
[0035]
【The invention's effect】
As described above, according to the water-retentive pavement structure of the present invention, it is possible to provide a water-retentive pavement structure in which the surface layer can be provided with water retention and the time for which water permeates from the surface layer surface into the surface layer is short. . Therefore, when the water-retentive pavement structure of the present invention is applied to urban road pavement, an increase in the temperature of the road surface is suppressed, and there is an effect of preventing the heat island phenomenon. In addition, since rainwater permeates quickly from the surface to the inside of the surface, it is possible to minimize the formation of a water film on the road surface even in rainy weather with a large amount of rainfall, and also has the effect of preventing the hydroplaning phenomenon. . Further, it is possible to provide a water-retentive pavement structure in which the surface layer is hardly ground by an automobile or the like, and the scattering of dust is small even when the surface layer is ground.
[0036]
According to the construction method of the water-retentive pavement structure of the present invention, the existing drainage pavement can be changed to the water-retention pavement, the construction is easy, the construction period is short, the construction cost is low, and the industrial waste is reduced. The advantageous effect that the construction method of the water-retentive pavement structure which does not generate | occur | produce also can be provided is obtained.
[Brief description of the drawings]
FIG. 1 is a sectional view of a water-retentive pavement structure according to an embodiment of the present invention.
FIG. 2 is a sectional view of drainage pavement applied to road pavement.
FIG. 3 is a diagram illustrating a state after filling a water-retentive filler into a surface layer of drainage pavement.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water-retentive pavement structure 2 Aggregate 3 Binder 4 Water-retentive filler 5 Subbase 6 Surface layer 7 Void

Claims (2)

In the surface layer of the drainage pavement solidified by bonding the granular aggregate into a state having a large number of voids with a binder, water-retentive filling obtained by kneading a mortar or cement paste with a granulating agent in the voids of the surface layer. A water-retentive pavement structure obtained by injecting and solidifying a material. In the surface layer of the drainage pavement solidified by bonding the granular aggregate into a state having a large number of voids with a binder, water-retentive filling obtained by kneading a mortar or cement paste with a granulating agent in the voids of the surface layer. Water-retentive filler injecting step of injecting material,
A solidification step of solidifying the water-retentive filler injected into the surface layer,
A method for constructing a water-retentive pavement structure, comprising:

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