JP3374309B2 - How to maintain the function of drainable 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 method for maintaining the function of a drainage pavement, and more particularly to a drainage mainly formed in a drainage pavement layer using a room temperature liquid radical crosslinkable resin composition having a high solid content. The present invention relates to a function maintaining method for coating a surface of a void portion, which is a flow path, to alleviate clogging of a drainage pavement due to a fall of earth and sand or dust and maintain a function for a long time.

[0002]

2. Description of the Related Art A drainage pavement is a pavement in which rainwater on the road surface passes through the pavement layer and is discharged to the shoulders of the road, etc., by providing a gap to allow rainwater to pass through the pavement layer. This pavement is designed to prevent the formation of a water film on the road surface, thereby alleviating the hydroplaning phenomenon, mitigating water splashes and splashes, and mitigating road surface reflections caused by headlights during rainy nights to ensure vehicle safety. It is a paving technique.
At the same time, this pavement also suppresses the noise generated by the contact between the tire and the road surface, and also has the effect of reducing traffic noise due to the sound absorption in the voids in the pavement layer.

[0003] The drainage pavement, in order to fit into mochi Japanese road conditions the effect of the above-mentioned, total 2,000,000 m ² at the construction area also fiscal 1993, an increase of the total 8 million m ² in the 1996 year-end ing.

The drainage pavement is damaged by the weight of the vehicle because the pavement layer has a void portion of about 18 to 27% by devising the composition of the aggregate and the binder in order to have the above-mentioned characteristics.・ Drainage voids are blocked by wear and compaction, dust falling, and dirt carried by the vehicle,
There is a problem that the initial drainage performance and noise suppression performance are gradually lost.

As a method for improving such a drainage pavement, in order to prevent the scattering of aggregates, improve the bonding force between the aggregates, and to prevent the drainage pavement from being damaged or worn, the surface layer of the pavement layer There is known a construction method (JP-A-5-222705) in which a (meth) acrylate resin mixture is applied and polymerized. However, the drainage function was not maintained.

[0006]

OBJECTS OF THE INVENTION It is an object of the present invention, by preventing the formation of the anchoring soil and dust definitive in drainage pavement, it is a method for improving the persistence of functional maintenance of drainage pavement.

[0007]

[Means for Solving the Problems] The inventors of the present invention have earnestly studied the mechanism of clogging of drainage pavement in order to maintain the drainage function of the drainage pavement. The present invention has been completed by discovering that the clogging substance can be prevented from sticking and the drainage function can be maintained by coating the surface of the drainage flow path in the void portion of the layer.

That is, the present invention is based on the roadbed or the base layer.
In the void formed inside the drainage asphalt pavement layer,
The voids are continuous, and the surface of the voids functioning as a drainage flow path is coated with a radical-crosslinking resin composition that is liquid at room temperature and has a high solid content that does not dissolve the asphalt on the surface of the voids. And the boom
50% to 80% by weight of the resin component (A)
%, (B) polymerizable unsaturated monomer 20 to 50% by weight
And a cured product of the radical-crosslinking resin composition.
Ar D hardness is 60 or more , preferably resin component
(A) is a vinyl ester resin (A1) and an air-drying imparting polymer
(A2), preferably the void portion is composed of a mixture of coarse aggregate, fine aggregate, filler, asphalt, drainage
Mixture coated with coarse aggregate of asphalt and filler on the inside asphalt pavement layers, it is intended to be composed of fine aggregate, the coating amount of the resin composition to the surface of the gap portion of the inner drainage asphalt layer But 0.0
Provided is a method for maintaining the function of a drainage pavement, which is characterized by being 1 to 1.5 Kg / m ² .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.

The cause of the deterioration of the function of the drainage pavement is due to crushing and clogging. Clogging occurs because the pores on the surface of the drainage pavement layer are narrowed by viscous irreversible deformation of the surrounding asphalt binder due to vehicle weight and the like. This phenomenon is solely due to the viscoelastic properties of the binder, and a binder exhibiting high viscoelasticity against crushing is preferable. In addition, the lower the maximum temperature that is recorded during service, the better.

The clogging in the present invention is a phenomenon in which dirt and dust carried in by a vehicle on the road and dust flying from the surroundings are clogged in the void portion, and the substance, shape, and the like which are blocked by the environment where the road is placed, The blockage status is different. The amount of occluded substances carried on the road also greatly depends on the environment.

As shown in FIG. 1, the roadbed 3 of the present invention is formed on the road body 1 and the roadbed 2 having a thickness of about 1 m from the lowermost part of the road, etc., and further increases the traffic load transmitted from the upper layer. It is for distributing and transmitting to the roadbed 2. Usually roadbed 3
Is provided separately for the upper layer roadbed 3-1 and the lower layer roadbed 3-2, and the lower layer roadbed 3-2 supports the upper layer roadbed 3-1. As the material, a high-quality material having high strength such as crushed stone is used for the upper layer roadbed 3-1 and is applied by a known method such as a particle size adjusting method or a bitumen stabilizing method. The lower layer roadbed 3-2 is constructed by an inexpensive material such as sand, iron and steel slag, and crusher run by the granular roadbed method, cement stabilization method, and the like. Roadbed 2 is pavement 6
(Surface layer 5 + base layer 4 + roadbed 3) About 1 m thick
This means that the traffic load is uniformly distributed to the road body 1 below the roadbed 2. Further, it serves as a construction base for the pavement 6. The roadbed 2 and the roadbed 3 are collectively referred to as a base 7. The roadbed 3 may be waterproof steel or concrete.

The base layer 4 corrects the unevenness of the roadbed 3 and transmits the load applied to the surface layer 5 to the roadbed 3 uniformly.
As the material, a heated asphalt mixture composed of aggregate, asphalt, and optionally filler is used. This layer is usually impermeable. The base layer 4 may be drainable as in the drainage pavement layer 5.

The surface layer 5 is a drainage asphalt pavement layer, which is equivalent to the surface layer of a normal asphalt pavement. By providing a gap portion such that rainwater can pass through the pavement body, rainwater on the road surface can be obtained. Etc. through the pavement layer to the shoulders and drains to prevent the formation of a water film on the road surface, alleviating the hydroplaning phenomenon, water splashing,
This will reduce the splash of water and reduce the road surface reflections caused by headlights during rainy nights to ensure the safety of the vehicle. The material is preferably one which is configured coarse aggregate, fine aggregate, filler, a mixture of asphalt. The porosity in the asphalt pavement layer is preferably about 18 to 27%.

The asphalt of the present invention is, for example, high viscosity modified asphalt, modified asphalt, straight asphalt and the like. These binders are straight asphalt, and preferably 4 to 12% by weight of a modifier such as rubber, latex, or thermoplastic resin is added and mixed as a modifier.

The coarse aggregate of the present invention is preferably 2.5 to
It is a 30 mm granular material, for example, crushed stone of No. 5-7. The fine aggregate is preferably a granular material having a particle size of 0.1 to 2.5 mm, and examples thereof include natural river sand, mountain sand, silica sand, and crushed stone. The filler is in the form of powder smaller than 0.1 mm, such as stone powder or slaked lime.

The voids formed inside the drainage asphalt pavement layer of the present invention are preferably formed by a coarse aggregate or a fine aggregate coated with a mixture of asphalt and a filler if necessary using an asphalt mixture as a binder. These are voids and gaps. In the drainage pavement layer, independent voids, voids continuous to the impermeable base layer,
Various types of voids such as dead-end voids, voids that connect voids, voids that are laterally continuous and continue to the road shoulder, etc. are generated. The void portion targeted by the present invention is a void portion that has void holes on the surface (road surface) and is continuous from the void holes to the impermeable base layer or to the road shoulder, and the drainage flow It is a void that functions as a path.

The void portion functioning as a drainage channel is a void portion in the drainage pavement layer through which water such as rainwater flows and which is drained to the road shoulder.

The room temperature liquid radical crosslinkable resin composition of the present invention has a low viscosity, a long pot life, and has no property of dissolving asphalt. The asphalt insolubility is obtained by using a (meth) acrylic unsaturated monomer as a main component as the polymerizable unsaturated monomer. It is preferable that the composition has good adhesion to asphalt when it becomes a cured product and has a property that the cured product has a low charging property. The high solids, radical crosslinking resin
(A) 50 to 80% by weight and polymerizable unsaturated monomer (B) 20 to 5
It is a resin composition consisting of 0% by weight.

This room temperature liquid radical crosslinkable resin composition coats the surface of the voids inside the drainage pavement layer to prevent adhesion of clogging substances adhering to the surface of the voids, resulting in drainage pavement. It is possible to prevent the functional deterioration of the layer. The cured product of the radical crosslinkable resin composition that is liquid at room temperature has a Shore D hardness of 60 or more. The initial viscosity (25 ° C.) of the composition is preferably 1 to 10 poise, and the curing time is 30 minutes or less. If the initial viscosity of the resin composition is outside this range, the coating on the surface of the void is not sufficient, which is not preferable.
If the Shore D hardness of the cured product is less than 60, the dust adhesion resistance is poor, which is not preferable.

The radical crosslinkable resin (A) is preferably a vinyl ester resin, for example, unsaturated polyester (meth) acrylate resin, epoxy (meth) acrylate resin, urethane (meth) acrylate resin and a mixture thereof. Is mentioned.

The unsaturated polyester (meth) acrylate resin is obtained by a condensation reaction between the dibasic acid containing the α, β-unsaturated dibasic acid and a polyhydric alcohol, and if necessary, a dicyclopentadiene compound. If necessary, a monobasic acid, a monohydric alcohol, a monoepoxy compound or the like is used, and preferably has a number average molecular weight of 500.
It is obtained by reacting a (meth) acrylic compound with the terminal of an unsaturated polyester in the range of up to 5,000.

The epoxy (meth) acrylate resin is
It is a resin obtained by reacting a bisphenol type epoxy resin alone or a resin obtained by mixing a bisphenol type epoxy resin and a novolak type epoxy resin with an unsaturated monobasic acid in the presence of an esterification catalyst.

The urethane (meth) acrylate resin of the present invention is preferably obtained by reacting polyisocyanate with a polyol such as polyether polyol, polyester polyol, polybutadiene polyol and a hydroxyalkyl (meth) acrylate compound,
For example, it is a resin obtained by reacting polyisocyanate obtained by reacting polypropylene glycol and tolylene diisocyanate (TDI) at a molar ratio of 1: 2 and 2-hydroxyethyl methacrylate at a molar ratio of 1: 2.

In the resin composition of the present invention, it is preferable to use the air-drying imparting polymer (A2) together as the resin component (A).
At that time, the nonvolatile content (resin solid content) is preferably 50 to
It is 80% by weight. If it is out of this range, the reinforcing effect of the drainage pavement layer will not be sufficient.

The air-drying imparting polymer (A2) of the present invention is a polymer prepared by introducing an air-drying component into the unsaturated polyester, vinyl ester resin or the like. The air-drying component includes the following known components. A glycol component, a combination of compounds containing allyl ether groups represented by _{-0-CH 2 -CH = CH 2} . A compound containing a cycloaliphatic unsaturated polybasic acid and its derivative is used in combination with the acid component. A compound containing dicyclopentadiene is used in combination. Drying oil and epoxy reactive diluent are used together.

The mixing ratio of the vinyl ester resin (A1) and the air-drying imparting polymer (A2) is such that the weight ratio of (A1) / (A2) is (A1) / (A2).
It is preferable that 1) :( A2) = 99: 1 to 50:50 (parts by weight). When the amount of the component (A2) is more than 50, properties such as tensile strength, tear strength, water resistance and wet heat resistance of the resin cured product deteriorate.

The polymerizable unsaturated monomer (B) used in the present invention is an acrylic unsaturated monomer such as an acrylic acid ester or a methacrylic acid ester as a main component, and is an acrylic unsaturated monomer that is crosslinkable with a resin. Examples thereof include saturated monomers and acrylic unsaturated oligomers. The styrene monomer used in the unsaturated polyester resin has high asphalt solubility and is not suitable for use in the present invention. However, they can be used in combination to the extent that the effects of the present invention are not impaired. The amount of the styrene monomer used is preferably 30 parts by weight or less based on 100 parts by weight of the solid content of the resin (A).

The radical-crosslinking resin composition of the present invention preferably contains a curing agent in order to accelerate curing, and examples of the curing agent include organic peroxides. Specific examples of organic peroxides include diacyl peroxide-based, peroxyester-based, hydroperoxide-based, dialkyl peroxide-based, ketone peroxide-based, peroxyketal-based, alkylperester-based, percarbonate-based, etc. The following are listed.

The amount of the curing agent added is preferably 100, which is the total amount of the radical crosslinkable resin (A) and the polymerizable unsaturated monomer (B).
It is 0.1 to 6 parts by weight with respect to parts by weight. You may use the said hardening | curing agent in combination of 2 or more types.

The radical crosslinkable resin composition of the present invention comprises
It is also preferable to include a curing accelerator, and examples of the curing accelerator include metal soaps such as cobalt naphthenate, cobalt octylate and zinc octylate, and examples of the metal chelate compound include vanadium acetyl acetate and cobalt acetyl acetate. There is. Examples of amines include known ones such as aniline and N, N-dimethylaniline.

The amount of the curing accelerator added is preferably 0.1 to 100 parts by weight of the radical crosslinkable resin (solid content).
Use 5 parts by weight. In the present invention, amine-based accelerators are preferred. The curing accelerator may be added to the resin in advance, or may be added at the time of use.

A polymerization inhibitor is preferably added to the resin composition of the present invention, and as the polymerization inhibitor, trihydrobenzene, hydroquinone, 1,4-naphthoquinone, parabenzoquinone, tolhydroquinone, hydroquinone monomethyl ether is used. , P-tert-butylcatechol, 2,6-tert-butyl-4-methylphenol and the like. The amount used is 10 to 1000 p in the composition.
pm is preferred.

The radical crosslinkable resin composition of the present invention comprises
In order to improve the air-curability of the resin surface, it is preferable to add wax. As the wax, paraffin wax and / or polar wax can be used alone or in combination, and as the polar wax, a polar group and a non-polar group are combined in its structure.
Specifically, Emanone 3199, 3299 (manufactured by Kao Corporation), Rikemar S-71-D, S-200 (manufactured by Riken Vitamin Co., Ltd.), NPS-8070, NPS-9.
125, OX-WEISSEN-8 (Nippon Seiwa Co., Ltd.)
Manufactured by Mitsubishi Chemical Co., Ltd.) and Diacarna PA-30 (manufactured by Mitsubishi Chemical).

The amount of the wax added is 10 in total of the radical crosslinkable resin (A) and the polymerizable unsaturated monomer (B).
0.1 to 5 parts by weight, preferably 0.2
~ 2.0 parts by weight are used.

Coating the surface of the voids in the drainage pavement layer of the present invention with a radical crosslinkable resin composition which is liquid at room temperature is specifically performed by spraying the resin composition on the surface of the drainage pavement layer. Be seen. Specifically, there are a method of spraying with a mechanical device, a casting method, a method of spraying with rain and dew, etc., but the casting method is preferable. Further, coating means that the sprayed resin composition enters the voids in the drainage pavement layer from the openings on the surface of the drainage pavement layer (pores on the surface of the drainage pavement layer in the voids) and is drained. This is to cover the surfaces of the coarse aggregate and the fine aggregate covered with asphalt or the like that form the voids so as to fill the voids that form the flow path.

The amount of the radical crosslinkable resin composition applied to the surface of the drainage pavement is preferably 1 to 4 Kg / m ² , and more preferably 1 to ² Kg / m ² . These dispersed resin compositions may remain on the drainage pavement surface, but it is desirable that they flow into the voids from the pavement surface pores as much as possible.

The coating amount of the resin composition on the surface of the voids inside the drainage pavement layer is preferably 0.01 to 1.5.
It is Kg / m ² . More preferably, it is 0.1 to 1 Kg / m ² .

Drainage The drainage of the pavement can be expressed by the constant water permeability coefficient. Usually, the constant water permeability coefficient of new drainage pavement is 1 × 10 ⁰ to 1 × 10 ⁻² cm / s. The constant hydraulic conductivity in a clogged state is lower than 1 × 10 ^-2 cm / s in a period of 1-2 years in a heavily clogged part.

After carrying out the present invention, if a clogging recovery work is required by a washing method with high pressure water, it is carried out when the water permeability is lower than 1 × 10 ^-2 cm / s. The degree of functional recovery in the work varies depending on the degree of recovery, but in the case of drainage pavement whose permeability coefficient has dropped to about 0.5 × 10 ^-3 cm / s, the recovery rate is 0.5 x
It recovers to about 10 ^-2 cm / s.

[0041]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples.

Reference Test (Elucidation of Mechanism of Clogging) A schematic sectional structure of the drainage pavement layer is shown in FIG. It is considered that the clogging phenomenon of drainage pavement is caused by the infiltration of earth and sand and dust with the flow of rainwater into the deep part of the void that exists randomly and continuously in the pavement layer, and is trapped in the deep void. The soil and dust adhere to the surface of the void (wall surface) by natural removal and drying of water, making removal difficult. Therefore, we confirmed by experiments how the clogging progresses.

[Experimental Method] A dry black soil (under 0.4 mm sieve) in an amount corresponding to the volume of the continuous voids in the sample was compulsorily filled in a slurry form, and the change of the water permeability was caused by a constant head difference. I investigated the situation of the outflow. The particle size distribution of this dry black soil is almost the same as the particle size distribution of earth and sand and dust reported as plugging substances on the actual road.

As a result, it was observed that, despite the passage of fresh water at a constant water level, the sediment flowed out on the one hand and the hydraulic conductivity decreased on the other hand over time (FIG. 3). It is presumed that this is because a relatively large particle is trapped in the bottleneck part of the void, and fine particles are successively stacked on it while water is flowing, while the sediment on the downstream side is discharged.

When this is schematically shown, as shown in FIG. 2, most of a large number of continuous voids in the pavement layer 5 are divided by very short closed voids, that is, It is considered that the middle of the continuous void part is clogged like a nodule of bamboo.

Considering the phenomenon in which soil and other substances clog the voids in the drainage pavement layer 5, it is presumed that the following two processes will be followed for each route from the road surface to the shoulder drainage. To be done.

One is that the sand or the like having a grain size that cannot physically pass through reaches the bottleneck portion of the void path and is trapped to further narrow the bottleneck portion. When this phenomenon is repeated until occlusion occurs. The other one is that the occluding substance can physically pass through the cavity route in terms of size, but adheres to the asphalt binder constituting the inner wall surface of the pavement layer 5 and finally narrows the inner wall diameter of the cavity, and finally, Estimates that it may lead to obstruction. Adhesion of earth and sand to the binder is also considered to be due to the fact that the binder has adhesiveness and is easily charged with static electricity.

Example 1 (Study of Effect of Coating) Based on the above consideration, the inventors of the present invention firstly used an asphalt binder as a radical cross-linking resin for the purpose of preventing adhesion of earth and sand to the surface of voids in the pavement layer 5. It was decided to coat with the composition. Therefore, four different kinds of resins, VE1: vinyl ester resin PA1: unsaturated polyester acrylate resin PA2: unsaturated polyester acrylate resin VU: vinyl urethane resin, were prepared, and a dust adhesion test of adhered earth and sand was conducted.

Four different resins VE1, PA1, PA
2 and VU are composed of the following 6 different resin compositions, which are mixed and blended as shown in Table 1. V-1: Vinyl ester resin composition UP-1: Unsaturated polyester methacrylate resin composition UPA-1: Unsaturated polyester methacrylate resin composition UMA-1: Urethane methacrylate resin composition P-1: Air dry Saturated polyester resin composition P-2: Air-drying unsaturated polyester resin composition

[Synthesis Example 1] Vinyl ester resin composition V
1038 g of an epoxy resin having an epoxy equivalent of 250 obtained by the reaction of the synthetic bisphenol A of -1 with epichlorohydrin (Epiclon 860 manufactured by Dainippon Ink and Chemicals, Inc.),
A bisphenol-type vinyl ester resin obtained by heating and reacting 113 g of bisphenol A and 273 g of methacrylic acid by a conventionally known method is dissolved in methyl methacrylate (hereinafter, abbreviated as MMA), and a vinyl ester resin composition having a nonvolatile content of 75% ( Sample V-1) was used.

[Synthesis Example 2] Synthesis of unsaturated polyester methacrylate resin composition UP-1: 140 g of neopentyl glycol, 412 g of ethylene oxide 2 mol adduct of bisphenol A, 252 g of isophthalic acid, 176 g of fumaric acid, 360 g of glycidyl methacrylate were conventionally used. The unsaturated polyester obtained by heat dehydration condensation by a known method was dissolved in styrene to obtain an unsaturated polyester methacrylate resin composition (sample UP-1) having a nonvolatile content of 55%.

[Synthesis Example 3] Synthesis of polyester methacrylate resin composition UPA-1 6.2 mol of triethylene glycol, 3.3 mol of diethylene glycol, 10 mol of phthalic acid, and 2 mol of glycidyl methacrylate were heated and dehydrated by a conventionally known method. The polyester methacrylate obtained by condensation was dissolved in MMA to obtain a polyester methacrylate resin (sample UPA-1) having a nonvolatile content of 75%.

[Synthesis Example 4] Synthesis of urethane methacrylate resin composition UMA-1 2.0 mol of tolylene diisocyanate, number average molecular weight 1
Urethane methacrylate resin composition having a nonvolatile content of 80% is obtained by dissolving urethane methacrylate obtained by heating and reacting 1.0 mol of 000 propylene glycol and 2.0 mol of 2-hydroxyethyl methacrylate in MMA by a conventionally known method. (Sample UMA-1).

[Synthesis Example 5] Synthesis of air-drying unsaturated polyester resin composition P-1 Triethylene glycol 431 g, diethylene glycol 305 g, phthalic anhydride 255 g, PMAA (cis-
3-methyl-4-cyclohexene-cis-1,2-dicarboxylic acid) 477 g and maleic anhydride 113 g were heated and dehydrated and condensed by a conventionally known method to obtain an air-drying unsaturated polyester, which was dissolved in MMA 500 g to obtain a nonvolatile content. 75%
Air-drying unsaturated polyester resin composition (Sample P-1)
And

[Synthesis Example 6] Synthesis of air-drying unsaturated polyester resin composition P-2: 141 g of ethylene glycol, diethylene glycol 2
72 g, tetrahydrophthalic anhydride 346 g, transesterification composition 433 g of trimethylol propane 2 mol and linseed oil 1 mol, and fumaric acid 396 g by heat dehydration condensation by a conventionally known method to obtain an air-drying unsaturated polyester composition. It was dissolved in MMA to obtain an air-drying unsaturated polyester resin composition (Sample P-2) having a nonvolatile content of 75%.

[0056]

[Table 1] Combination of four types of resins VE1, PA1, PA2, VU

[Test method] Asphalt mortar (straight asphalt 60/80: 30% by weight,
Fine sand: 40 wt%, filler: 30 wt% mixed product) was evenly applied, and four types (VE1, PA1,
The resin composition of PA2, VU) was applied as a coating material. The pottery plate was placed in water in which black soil (600 mesh or less) having a particle size distribution close to that of the plugging substance was suspended, the black soil was allowed to settle on the plate, and after taking out, it was dried at 60 ° C. for 24 hours.

<Dust Adhesion Evaluation Test Method> (Injection test) 7 including the case without coating material
2 kinds of test plates at a flow velocity of 14 m / sec from the closest distance
5 cc of water was sprayed and the dirt adhesion of the soil was visually observed.

(Flowing water test) 25 cc of water was made to flow down at 6 cc / sec from the upper center of the inclined ceramic plate sample, and the removability was visually observed. The results are shown in Table 2.

(Measurement of Electrostatic Decay Time) US Military Standard MIL-B-
According to 81705, the electrostatic decay time was measured using an electrostatic decay time measuring device 406C manufactured by US Electro-tech Systems. INC. Specifically, the following No. of 3 × 5 inches is used. 1 to
A voltage of 5000 V was applied to the six types of resin cured product test pieces of No. 6, and the time until the charging voltage reached 500 V after grounding was measured.

The six types of test pieces are No. 1: VE1 No. 2: PA1 No. 3: PA1 + VU [PA1 / VU = 50/50
(PHR) mixed] No. 4: VE1 + PA2 [VE1 / PA2 = 50/5
Mixed at 0 (PHR)] No. 5: VU No. 6: A resin cured product obtained by adding 2 parts of 50% BPO to a resin solution consisting of PA2 and curing it.

[0062]

[Table 2]

<Evaluation Criteria for Dust Resistance> ×: Almost no dust can be removed △: Slightly peeled dust ○: Peeling of dust is seen ◎: Great dust removal effect

With respect to the dust adhesion resistance, the higher the Shore D hardness was, the better the result was, regardless of the type of resin. That is, dust resistance (easiness of removing dust such as earth and sand)
Has excellent shore hardness of 60 or more,
Those less than 60 were not good.

Regarding the anti-dust adhesion property, when the electrostatic decay time (10% cut-off time) was measured from the viewpoint of charging property, 0.14 seconds or less exhibited an excellent effect,
More than a second wasn't good.

(Confirmation Method of Coating Effect of Coating Material)
The inventors have devised the following method in order to confirm the effect of maintaining the function of the drainage pavement in the examination of the room.

1) The specimen used for the examination is the one using the drainage pavement layer specimen material used for elucidating the mechanism of clogging. The specimen is packed with dry black soil by the method shown in the next section, and the hydraulic conductivity is measured. To do. This value can be regarded as indicating the clogging state of the pavement on the actual road.

2) Next, the specimen in the clogged state is usually
Head (8 to 10 cm) applied when measuring permeability
The larger head of 30 cm is applied for 15 minutes, and the hydraulic conductivity is measured. This value can be regarded as observing that the blockage substance in the pavement on the actual road promotes the state of being washed away by rainwater.

3) When a water head of 50 cm was continuously applied to this test piece, a certain amount of saturated sodium bicarbonate aqueous solution was further infiltrated, and then an equivalent amount of oxalic acid aqueous solution was sprayed to generate air bubbles and clog the soil. Wash and measure water permeability. This can be regarded as a state after the function recovery device or other means forcibly removes the clogging material of the drainage pavement, that is, after performing the function recovery operation.

(Preparation of clogging test piece coated with coating material) Then, the target porosity was set to 23%, 25%, 27%.
A drainage pavement layer test specimen for marshall test (10 cm × 10 cm × 6.5 cm, double sided 50 times each, hereinafter referred to as “test specimen”) was prepared with the following three types of ingredients. Asphalt binders include Ecophalt TA (Nippon Oil
Co., Ltd., penetration 58, softening point 93.5 ℃, 60 ℃, viscosity 1
00 × 10 ⁴ ps or more) was used. Radical cross-linking resin composition (VE1, curing time 1
2 minutes) was coated on the specimens having different target porosities by changing the spray amount.

[0071]

[Table 3]

Mud water obtained by suspending 80 g of black soil of 600 mesh or less in 400 cc of water was poured into these specimens. Since it contained fine particles of black soil, the water that had permeated from the test piece was thoroughly stirred once only by thoroughly stirring it on the top surface of the test piece. The thus-filled sample thus obtained was dried at 60 ° C. for 24 hours, and then the black soil remaining on the upper surface of the sample was thoroughly removed with a brush and used for the measurement of the constant water permeability coefficient. The constant water permeability coefficient was measured by devising the device shown in FIG. 4 so that the differential pressure applied to the upper and lower sides of the specimen could be freely changed.

Example 2 (Effect by Spraying Amount) Surface coating of continuous voids by spraying the radical cross-linking resin composition (coating material) Drainage Can be considered. On the first side, the surface of the voids is coated to provide excellent dust resistance, and on the second side, the sprayed coating material blocks the bottleneck of the continuous voids in the pavement layer,
The experiment of Example 2 was carried out with respect to the point that the permeability may be lowered.

First, in order to confirm the second aspect, new test specimens having different spraying amounts (normal temperature liquid radical cross-linking resin composition: VE1) were prepared, and the results of measuring the respective hydraulic conductivity values are shown in FIG. It was shown to.

That is, the test piece having a porosity of 23% has a water permeability of 1 × even if the amount of resin sprayed is 0.8 kg / m ^2.
It is 10 ^-1 cm / sec or more, and the drainage function is sufficiently retained. In other words, as the amount of sprayed resin increases, the permeability decreases,
Although the drainage performance is poor, the permeability coefficient differs depending on the porosity of the drainage pavement layer, that is, even if the drainage pavement layer has a low porosity, the permeability coefficient is excellent, that is, the drainage function is sufficiently retained. It turns out that it was done.

Example 3 (Effect of coating continuous void surface) After sufficiently dipping the test piece in a room temperature liquid radical cross-linking resin composition (VE1: initial viscosity 3 poise, curing time 12 minutes), an extra resin was pulled up. The composition was sufficiently removed, and the resin composition was cured and formed on the surface of the void portion of the test piece. This was clogged with a clogged substance according to the method for producing the clogged specimen. The specimen thus clogged was subjected to a differential pressure of 15 minutes at a water head of 30 cm, and the specimen was compared with an uncoated specimen of the radical crosslinkable resin composition treated in the same manner.

The results are shown in FIG. The water permeability of the test piece in which the radical cross-linking resin composition is coated on the void surface of the drainage pavement layer is inferior to that of the uncoated test piece immediately after preparation and the test piece immediately after coating, After the filling operation, the water permeability coefficients are about the same, but it was confirmed that the coated sample was superior after the pressure difference of 30 cm was applied. (See FIG. 6) Therefore, it was confirmed that the drainage pavement layer having the specific coating material applied to the surface of the void had excellent drainage property.

Example 4 (Efficiency of functional recovery work by applying coating material) Since the asphalt surface coated with the radical cross-linking type resin composition is excellent in the dust resistance of the earth and sand, the efficiency of the drainage function recovery work is improved. is expected.

[Test Method] A new drainage pavement layer specimen having a target porosity of 23%, and further, the drainage pavement layer specimen was used as a radical crosslinkable resin composition (VE1: initial viscosity 3 poise, curing time 12 minutes). Resin amount of 0.3 Kg / m ² , 0.6 Kg / m ² ,
A drainage pavement layer specimen was prepared by spraying the resin composition so as to have a concentration of 0.9 kg / m ² and 1.2 kg / m ² and curing and forming the resin composition on the surface of the voids.

This specimen was clogged with a clogging substance according to the method for producing the specimen. After applying a differential pressure of 15 minutes at a water head of 50 cm to this clogged sample, further infiltrating 200 cc of a saturated aqueous sodium bicarbonate solution, spraying an equivalent amount of an oxalic acid aqueous solution, and generating bubbles to wash the clogged soil. I went. The hydraulic conductivity of the specimen was measured after each work.

FIG. 7 shows the results of measuring the hydraulic conductivity of the new drainage pavement layer specimen and the drainage pavement layer specimen at each treatment stage. Compared with the uncoated specimen of the radical crosslinkable resin composition, the water permeability of the drainage pavement layer specimen coated with the radical crosslinkable resin composition is inferior in the new state (black square, ■ mark), After clogging operation, 5
It was confirmed that an excellent hydraulic conductivity value was exhibited after the 0 cm differential pressure was applied. Although the recovery efficiency varies depending on the sprayed amount of the radical crosslinkable resin composition even after washing, the drainage pavement layer test piece slightly coated with the radical crosslinkable resin composition is superior to the uncoated test piece. I found out that
(See Figure 7)

[0082]

INDUSTRIAL APPLICABILITY According to the present invention, after the drainage asphalt pavement layer is constructed on the roadbed or the base layer, the asphalt is not melted to the surface of the continuous voids in the pavement layer which function as the drainage channel. By coating the solid content room temperature liquid radical cross-linking type resin composition, it is possible to prevent the clogging substance from sticking and to prevent clogging of drainage pavement .
By improving the dirt resistance of dirt and dust , the drainage function can be maintained for a long period of time. This method
The function can be maintained by itself, but at the same time, from the principle,
It also improves the effect of drainage function recovery by the function recovery device.

[0083]

[Brief description of drawings]

FIG. 1 is an example of a cross-sectional structure of a drainage pavement of the present invention.

FIG. 2 is a schematic cross-sectional view of a drainage pavement layer clogged.

FIG. 3 shows the relationship between clogged soil and cleaning of voids.

FIG. 4 shows a hydraulic conductivity measuring device.

FIG. 5 shows the relationship between the porosity of the drainage pavement layer, the amount of resin sprayed, and the hydraulic conductivity.

FIG. 6 shows the relationship between the presence or absence of coating of the voids in the drainage pavement layer and the hydraulic conductivity.

[Fig. 7] Fig. 7 shows the relationship between the resin content in the voids in the drainage pavement layer and the hydraulic conductivity at the time of 50c after filling the new sample
After the differential pressure is applied, it is shown after cleaning.

[Explanation of symbols]

1: Road body 2: Roadbed 3: Roadbed 3-1: Upper roadbed 3-2: Lower roadbed 4: Base layer 5: Surface layer (drainage pavement layer) 6: Pavement 7: Base (roadbed 2 + roadbed 3)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ identification code FI C09D 175/14 C09D 175/14 (72) Inventor Masaaki Sunada 3-16-203 Mizuo Ibaraki, Osaka Prefecture Nichimoku Green Town 8th Building ( 72) Inventor Mitsunori Ikezoe 1-26 Ikezono-cho, Izumiotsu-shi, Osaka (72) Inventor Toshio Mita 154,5 Okayama-cho, Kishiwada-shi, Osaka (72) Inventor Shinya Ueno 1-5, Tomobuchi-cho, Miyakojima-ku, Osaka-shi, Osaka 8-402 (56) Reference JP-A-8-253709 (JP, A) JP-A-8-311805 (JP, A) JP-A-8-13407 (JP, A) JP-A-63-315708 (JP, A) JP-A-11-158805 (JP, A) JP-A-11-269807 (JP, A) JP-A-10-259321 (JP, A) JP-A-63-304804 (JP, A) JP-A-5 -222705 (JP, A) JP-A-11-236701 (JP, A) (58)査the field (Int.Cl. ^7, DB name) E01C 7/18 C09D 201/00 E01C 11/24 C09D 163/10 C09D 167/06 C09D 175/14

Claims (4)

(57) [Claims] 1. A void portion formed inside a drainage asphalt pavement layer on a roadbed or a base layer, the void portion being continuous and functioning as a drainage flow path. to the surface of the high solids that do not dissolve the asphalt airspace surface, coating the radical crosslinking resin composition of the liquid state at room temperature, and the radical cross-linked resin sets
The product is (A) 50 to 80% by weight of the resin component, and (B) is polymerizable
20-50% by weight of a sum monomer, and the radical
Shore D hardness of the cured product of the crosslinkable resin composition is 60 or more.
A method for maintaining the function of a drainage pavement, characterized in that 2. The resin component (A) is a vinyl ester resin (A
1) and functional maintenance method according to claim 1 Symbol placement of drainage pavement, characterized in that consists of air-drying imparting polymer with (A2). 3. The void portion includes coarse aggregate, fine aggregate, filler,
The drainage according to claim 1 or 2, wherein the drainage is composed of a coarse aggregate and a fine aggregate covered with a mixture of asphalt and a filler in the asphalt pavement layer formed of a mixture of asphalt. For maintaining the function of flexible pavement. 4. The coating amount of the resin composition on the surface of the void inside the drainage asphalt pavement layer is 0.0.
Claim, characterized in that a 1~1.5Kg / m ² 1~
3. The method for maintaining the function of the drainage pavement according to any one of 3 above.