JP2002266305A - Elastic pavement execution method for low noise - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic pavement execution method for low noises in which actual usability is improved by making the most of low noise properties as highest properties in elastic pavement for low noises and largely shortening a curing time. SOLUTION: In the pavement execution method in which cutting works and/or grinding cleaning works by a shot blasting are conducted to a road surface, primer coating is executed on the road surface while a paving-material component containing hard aggregate, elastic aggregate and a urethane binder is mixed by a mixer and a paving-material mixture is obtained, the paving- material mixture is laid on the road surface and compaction works are conducted, a rate occupying by hard aggregate in the total amount of hard aggregate and elastic aggregate is set in 10-75 vol.%. In the pavement execution method using a two-pack urethane binder as the urethane binder, compaction works are conducted, and steam is projected onto the compacted paved surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for pavement construction on a roadway or the like, and more particularly, to a method for constructing a low noise elastic pavement comprising a hard aggregate, an elastic aggregate and a urethane binder in a shorter time. An elastic pavement construction method for low noise with excellent practicality (hereinafter, also simply referred to as "construction method")
About.

[0002]

2. Description of the Related Art Conventionally, pavement for general roads such as a roadway includes:
Elastic pavement for low noise is used to improve sound absorption and ventilation by providing a gap inside, and to improve low noise.
For example, those using a pavement material obtained by binding elastic aggregates such as rubber chips with a binder are known. Such low-noise elastic pavement, in addition to its low-noise properties, has higher elasticity than ordinary asphalt pavement, and has excellent properties as a general road pavement, such as good shock absorption. I have.

In the case of a pavement material using such a rubber chip,
Since ordinary asphalt binders cannot be used because of their poor adhesion to rubber materials, curable binders such as urethane and epoxy, and mainly urethane binders, are generally used as binders.

[0004]

However, in the case of an existing pavement material using a urethane binder, a hardening time of 48 hours or more is generally required in the case of an on-site construction type, and asphalt pavement capable of completing the construction in about 10 hours The construction period was significantly longer than in the case of. That is, such a conventional construction method in which only the pavement material is applied as it is lacks practicality in that traffic regulation must be performed for two days or more in view of today's traffic conditions.

[0005] Therefore, an object of the present invention is to improve the practical usability by further shortening the hardening time by utilizing the low noise property which is the greatest characteristic of the low noise elastic pavement.
An object of the present invention is to provide a low noise elastic pavement construction method.

[0006]

In order to solve the above-mentioned problems, an elastic pavement construction method for low noise according to the present invention is as follows. (1) The surface of the road is polished by cutting and / or shot blasting, and a primer is applied to the surface of the road, while a pavement component containing hard aggregate, elastic aggregate and urethane binder is mixed with a mixer. To obtain a mixture, laying the mixture on the road surface,
A method for low-noise elastic pavement construction in which compaction is performed, wherein the ratio of the hard aggregate to the total amount of the hard aggregate and the elastic aggregate is set to 10 to 75% by volume, and a two-component urethane binder is used. An elastic pavement construction method for low noise, characterized in that, after the compaction work is performed, steam is applied to the compacted pavement surface in an implementation method using a urethane binder.

(2) The method according to (1) above, wherein after the compaction is performed, a mist is sprayed on the compacted pavement surface prior to the steam projection.

(3) The method according to (1) or (2), wherein the steam projection is performed at a pressure of 0.5 to 10 kg / c.
is a construction method carried out in m ^2.

(4) The construction method according to any one of the above (1) to (3), wherein the steam projection is performed from a position at a height of 0.5 to 10 cm from a compacted pavement surface. Is the law.

(5) The construction method according to any one of (1) to (4), wherein the steam projection is performed for a projection time of 0.5
It is a construction method performed in ~ 5 minutes.

(6) The method according to any one of (1) to (5), wherein a rubber chip material having a size of 10 mm or less is used as the elastic aggregate.

(7) The method according to any one of (1) to (6), wherein the hard aggregate is 1.18 mm.
This is a construction method that uses a material whose weight that passes through the sieve is 5% or more.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. The low-noise elastic pavement construction method of the present invention is characterized in that steam is projected onto a pavement road surface after each of the steps of cutting, primer application, laying of a pavement mixture, and compaction. It usually takes 48 hours or more even in summer to completely cure the pavement road surface with a pavement material using a urethane binder.By performing such steam radiation, the curing of the formed pavement is promoted and compaction is performed. After the process, the curing time can be reduced to a minimum of about 4 to 5 hours. This makes it possible to realize a highly practical construction method with less traffic regulation problems while utilizing the low noise property of the elastic pavement.

The steam projection conditions may be appropriately determined according to the temperature at the time of construction, the ratio of hard aggregate to elastic aggregate, and the type and amount of urethane binder used. Preferably 0.5 to 10 kg / c
m ² , more preferably 2 to 5 kg / cm ² . 0.5
If it is less than kg / cm ² , the effect of accelerating the curing is not sufficient, while if it exceeds 10 kg / cm ² , only the surface is cured first, resulting in insufficient uniform curing inside. The projection time is preferably 0.5 to 5 minutes. 0.
If it is less than 5 minutes, the curing acceleration effect is not sufficient, while
Even if it exceeds 5 minutes, no further curing acceleration effect can be expected.

The steam projection is preferably performed from a position at a height of 0.5 to 10 cm from the pavement surface. If the height is less than 0.5 cm, there is a risk of contact between the steam outlet and the pavement surface.
When it exceeds, it becomes difficult to secure a sufficient steam projection pressure, which is not preferable.

In the present invention, there are no particular restrictions on the steps other than the above-mentioned steam projection, construction conditions, and the like.
What is necessary is just to follow a conventionally well-known method and conditions. First, the target road surface is cut to a desired depth by a road surface cutting machine, and / or ground by shot blasting to form a construction base. Next, as a primer work, a primer is applied on the working base using a roller brush or the like. On the other hand, a pavement material component to be described later is mixed with a mixer to prepare a pavement material mixture, and the pavement material mixture is laid on the road surface after the primer work. At this time, it is preferable that the production of the paving material mixture be performed while moving together with the asphalt finisher in the vicinity of the construction site. Further, the pavement road surface is formed by subjecting the laid surface to compaction.

[0017] In the present invention, it is preferable that the mist is sprayed on the pavement surface within 10 to 30 minutes thereafter. By performing the atomization prior to the steam projection, it is possible to reduce the tackiness of the uncured pavement road surface after compaction and prevent the binder from flowing. After spraying, 0.5 ~
It is preferable to cure for about 5.0 hours.

The low-noise elastic pavement according to the present invention is formed of a pavement mixture comprising a hard aggregate and a pavement component containing an elastic aggregate and a urethane binder. The paving material component will be described in detail below.

The hard aggregate generally includes, for example, natural aggregates made of natural stones such as river gravel and river sand and artificial aggregates such as crushed stone, slag, ceramics and the like, and is not particularly limited. . The stone, sand and the like used for the hard aggregate ensure the strength and abrasion resistance of the pavement, and are exposed on the surface to obtain an anti-slip action. From the viewpoint of the slip resistance of the pavement road surface, it is preferable that a certain amount of the fine component having a certain particle size is contained in the hard aggregate, that is, the passing weight ratio of the 1.18 mm sieve is 5% or more. Preferably, there is. The presence of this fine-grained component in the hard aggregate causes the pavement surface to be rough like sandpaper, thereby providing an anti-slip effect.

As the elastic aggregate, a rubber chip, that is, a small piece of rubber, powder, or the like can be used. By including the rubber chip, elasticity can be given to the pavement. Preferably, it is a rubber chip having a size of 10 mm or less, and a fine particle having a particle size of 1 mm or less to a size of about 10 mm can be appropriately used. It is more preferable because it is effective in terms of properties and void formation. Such a rubber chip may be either a natural rubber or a synthetic rubber, and may be formed by mechanically pulverizing a vulcanized rubber product such as a waste tire.

When considering the slip resistance, the mixing ratio of the hard aggregate and the elastic aggregate is such that the ratio of the hard aggregate to the total amount of the two aggregates is 10 to 75% by volume, preferably 50 to 75% by volume. It is 75% by volume. In the pavement material component, the content of the hard aggregate determines the slip resistance of the pavement, so that a slip resistance of BPN (measured by a portable skid resistance tester) of 60 or more can be secured. If the ratio of the hard aggregate is too small, not only the slip resistance, but also the amount of deflection of the pavement due to the vehicle weight increases, which affects steering stability, which is not preferable. On the other hand, if the amount of the hard aggregate is too large, the elasticity is impaired and the low noise performance is adversely affected, which is not preferable.

The hard aggregates and the elastic aggregates are classified according to the hardness according to JIS-A hardness.
Degree and the elastic aggregate has a hardness of 90 degrees or less. The hardness of the waste tire is usually 60 to 70 degrees, and about 80 to 90 degrees if it is heated.

The urethane binder is used for binding the aggregate to form a pavement. In the present invention, in particular, the two-component urethane binder, the isocyanate group-terminated prepolymer and the polyol are combined with a hydroxyl group / polyol. A mixture of isocyanate groups at an equivalent ratio of, for example, 0.2 to 0.8 is used. One-component urethane binders are not suitable for the purpose of the present invention, because the curing time is extremely difficult to adjust and less versatile than two-component urethane binders, and it is difficult to shorten the curing time. The amount of the urethane binder to be added is preferably from 15 to 30% by volume of the total from the viewpoint of the binding strength of the aggregate.

As an example of the isocyanate terminal group prepolymer, the isocyanate content is 5 to 25% and the viscosity is 10%.
Those having an average number of functional groups of 2 to 3 at an isocyanate terminal group prepolymer at 00 to 5000 CP (25 ° C.). As the isocyanate for this prepolymer,
For example, there is diphenylmethane diisocyanate polyisocyanate. As the active hydrogen compound used for the modification, usually, a polyalkylene glycol having a molecular weight of about 1,000 to 3,000 is used.

On the other hand, as an example of the polyol, it is preferable that the average number of functional groups is 2 to 6, the average molecular weight is 1000 or less, and at least half of the hydroxyl groups are primary hydroxyl groups from the viewpoint of reactivity. For example, ethylene glycol, diethylene glycol, polyalkylene ether glycol and the like can be mentioned.

In the present invention, the curing time of the pavement can be shortened more than ever by steam projection, but by adjusting the mixing ratio of the isocyanate terminal group prepolymer of the binder and the polyol,
It is also possible to adjust the intrinsic curing time. The mixing ratio is, for example, an equivalent ratio of hydroxyl group / isocyanate group of 0.1.
It can be appropriately selected within the range of 2 to 1.0.
The curing speed can be adjusted using a known amine-based or metal-based curing accelerator.

Further, by adding the organic silane to the urethane binder in an amount of 0.1 to 10% by weight, the bonding strength between the urethane binder and the aggregate can be increased, and the strength and durability can be improved. . In addition, as the organic silane, an epoxy silane, a mercapto organic silane, or the like can be used.

Further, when it is required to color the pavement material, it is possible to color the urethane binder by mixing it with a coloring agent. As such a coloring agent, for example, a carbon type can be used in the case of black, and a titanium type can be used in the case of white, and the addition amount is preferably 1 to 10% by weight of the urethane binder.
Also, a colored rubber chip as an elastic aggregate, for example,
It is also possible to color the paving material using artificial rubber such as EPDM color rubber chips or colored ceramics. In addition, it goes without saying that known additives other than those described above can be appropriately contained in the pavement material constituent components according to the present invention.

As a method of mixing these paving material constituents, a binder is added and mixed to a place where hard aggregate and elastic aggregate are mixed by using a known mixer to prepare a paving material mixture. In this case, the urethane binder is an isocyanate terminal group prepolymer, a polyol,
If necessary, a colorant, an organic silane, a curing accelerator and the like may be mixed in advance, or may be separately added and mixed. As a method of adding the aggregate and the binder at the time of mixing, any method may be used as long as both can be uniformly attached. The temperature at the time of addition and mixing of the binder may be room temperature, but if the temperature is low, the curing is delayed, and if the temperature is high, the curing is accelerated, so that the temperature may need to be adjusted.

[0030]

The present invention will be described below with reference to examples and comparative examples. Examples 1 to 6 and Comparative Examples 1 and 2 After the existing pavement was cut to a predetermined depth by a road surface cutting machine, the surface was ground by shot blasting (projection density 150 k).
g / m ² ), which was used as a foundation for construction. Next, the road surface was coated with a primer by a roller brush.

On the other hand, as the paving material, samples of various paving materials were prepared using the following paving material components. The mixing ratio of the hard aggregate and the elastic aggregate was 25:75 in volume ratio. Hard aggregate: Silica sand No. 3 to 7 mixture Elastic aggregate: Tire recycled rubber chip, particle size 2 to 5 m
m Urethane binder: Two-part curable urethane binder

The above-mentioned hard aggregate, elastic aggregate, urethane binder and the like were mixed by a mixer. Such mixing was performed in the vicinity of the construction site while moving with the asphalt finisher. The laying work was laid at a speed of 0.5 to 1 m / min by an asphalt finisher in anticipation of the excess of the mixture. Compaction was performed using a 2.5-ton tandem roller and a vibrating tumbler.

In Examples 2, 3, 5, and 6, spraying was performed immediately after laying, and after curing for 2 hours, steam was sprayed. Curing condition is 20 ℃ × 60%, 5 ℃ × 4
Two types of 0% were set. The projection time and steam pressure of steam were as shown in Table 1 below, and the height of the steam injection port from the road surface was 1 cm. Comparative Example 1 was a case where only spraying was performed and no steam projection was performed, and Comparative Example 2 was a case where neither spraying nor steam projection was performed.

For each of the examples and comparative examples,
A penetration test was performed and the presence or absence of binder flow was evaluated. The outline of the penetration test is as follows. Apparatus: Autograph-5000 (manufactured by Shimadzu) Evaluation method: A round bar having a diameter of 50 mm was attached to the load cell side as a measuring jig, and a mold (diameter 100 mm, height 40 m) was attached.
m) sample (volume: 100mm in diameter, 30m in height)
m). The strength against the displacement (strain amount) at that time was measured, and the time until the weight reached 300 kgf when the displacement was 5 mm was measured to evaluate the time until the curing was completed.

The results are shown in Table 1 below.
The curing time in the table is a time obtained by uniformly curing for 3.5 hours from mixing of the mixer to steam projection, and further adding the curing time after steam projection. In addition, about the time reached, when the penetration strength is 5 mm displacement, 300
It was determined from a plot of the time to reach kgf.

[0036]

[Table 1] 1) The presence or absence of clogging by a binder between rubber chips was determined by visual judgment.

[0037]

As described above, according to the present invention, by reducing the hardening time of a pavement using a urethane binder, the low-noise property which is the greatest characteristic of the low-noise elastic pavement is utilized. At the same time, it is possible to realize a more practical low-noise elastic pavement construction method with low noise.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Fujita 3-13-1, Kyobashi, Chuo-ku, Tokyo Taisei Ro-Tech Co., Ltd. (72) Inventor Mitsuaki Maeda 5-7-6 Yanagisawa, Nishi-Tokyo, Tokyo ( 72) Inventor Hidefumi Yanagi 6-23-9-1009 Sagamiono, Sagamihara City, Kanagawa Prefecture (72) Inventor Kinji 3596-1-213 Maiokacho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F term (reference) 2D051 AA06 AG03 AG13 AH01 EA06

Claims (7)

[Claims] 1. A pavement material component comprising a hard aggregate, an elastic aggregate and a urethane binder while applying a primer to the road surface by performing cutting and / or shot-blasting on the road surface. A pavement mixture by mixing with a mixer, laying the pavement mixture on the road surface, and then performing compaction work, wherein the total amount of the hard aggregate and the elastic aggregate In the pavement execution method using a two-component urethane binder as the urethane binder, the ratio of the hard aggregate to 10 to 75% by volume of the hard aggregate is used, and after the compaction is performed, steam is applied to the compacted pavement surface. An elastic pavement construction method for low noise, characterized by performing projection. 2. The low-noise resilient pavement construction method according to claim 1, wherein after the compaction is performed, prior to the steam projection, mist blowing is performed on the compacted pavement surface. 3. The steam projection is performed at a pressure of 0.5 to 10 k.
3. The low noise resilient pavement construction method according to claim 1, which is performed at g / cm ² . 4. The steam projection is performed from a position at a height of 0.5 to 10 cm from a compacted pavement surface.
The method for constructing an elastic pavement for low noise according to any one of claims 3 to 3. 5. The method according to claim 1, wherein the steam projection is performed for a projection time of 0.5 to 5 hours.
The elastic pavement construction method for low noise according to any one of claims 1 to 4, which is performed in minutes. 6. The low noise elastic pavement construction method according to claim 1, wherein a rubber chip material having a size of 10 mm or less is used as the elastic aggregate. 7. The hard aggregate having a weight of 5% or more passing through a 1.18 mm sieve is used.
The low-noise resilient pavement construction method according to any one of claims 6 to 6.