JPS59224705A - Regeneration of bitmen substance on road - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a road rehabilitation method for bituminous pavement.

In recent years, research and development on resource conservation has been actively conducted in the road field as well. In particular, when an existing pavement reaches its service life limit, the only repair method used to be to replace it, but now there is technology to recycle a portion of the paving fees from aging existing pavement. A plant method and an on-the-street method for processing on-site have been developed.

One of the latter methods is the road reclamation roadbed construction method. Recently, its use as a repair method for bituminous pavement on prefectural roads, municipal roads, etc. is increasing year by year. This method is used for the surface layer or surface/base layer (hereinafter referred to as F1) of old bituminous pavement.
This is a construction method that processes and recycles the roadbed and roadbed into a new pavement base on the road, and reuses the existing pavement material as a new pavement base without disposing of it as waste. Generally, bituminous emulsion and/or cement is spread or spread on the surface of bituminous pavement, and is scraped, crushed, and mixed from the road surface to a certain depth of the roadbed (or roadbed).
The mixture is spread evenly, leveled, and compacted to form a roadbed.

As construction machinery, deep stabilizers are mainly used for scraping, crushing, and mixing work.

In addition, a road planer, scarifier, ripper, etc. may also be used in combination. Recycled roadbed is made up of the crushed material of the surface layer and roadbed material mixed with bitumen emulsion and perhaps cement, so it is recycled as a durable and stabilized roadbed.

However, because this stable treatment involves on-road mixing at the site and the mixed material is quite thick, the recycled roadbed formed has uneven particle sizes of crushed materials and is dense even after sufficient compaction. There are considerable voids. Although these voids gradually decrease and the pavement becomes denser as it is used for traffic, it brings with it some downsides.

For example, infiltration of rainwater, insufficient interlocking between aggregates in the treatment layer, etc. These factors lead to scattering of bone tissue in the treated layer, a decrease in durability, etc., and become a source of shortening the life of the pavement.

The present invention solves such drawbacks by forming a recycled roadbed, then filling the voids, surface irregularities, and unevenness in the recycled roadbed with 1lrN (a slurry-like mixture containing blue emulsion as a binder). Furthermore, the recycled roadbed surface is coated to create a dense pavement.
This provides a road restoration method that regenerates pavement with excellent water resistance and durability.

Then, the present invention involves spraying or spreading emulsion and/or cement on the existing DV blue pavement surface, scraping up the roadbed or roadbed from the pavement surface to a predetermined depth, crushing and mixing, and spreading the emulsion and/or cement. A recycled roadbed is formed by rolling, and then a slurry-like mixture consisting of bitumen emulsion, fine aggregate, filler, etc. is filled into the voids inside the recycled roadbed, and the surface of the recycled roadbed is filled with a slurry-like mixture consisting of bituminous emulsion, fine aggregate, filler, etc. The gist of this paper is a road restoration method for sandstone pavement, which is characterized by coating it with a mixture.

That is, the construction method of the present invention is a construction method (hereinafter referred to as the first
This method is a combination of two methods: 1) filling the voids in the reclaimed roadbed with a slurry mixture containing bitumen emulsion as a binder from the surface of the recycled roadbed, and coating the surface (hereinafter referred to as 2nd step). It is a composite construction method.

Changes in the cross section of a bitumen pavement by the road restoration method of the present invention are shown in the figure in relation to the process.

In the figure, [I] shows the cross section of the existing bituminous pavement before the first step, (II) shows the cross section of the existing bituminous pavement after the first step, and [u1] shows the cross section of the existing bituminous pavement after the first step. This figure shows a cross section of the 71qj blue pavement after the second step was performed following the first step.

In the figure, (1) shows the surface layer of the blue pavement (i.e. surface layer, surface, base layer) at the existing σ, and (2) shows the circuit board.

A indicates the thickness of (1), 13 indicates the thickness of (2), and I-1 indicates the total thickness of the surface layer and the roadbed. (3) shows the recycled roadbed. 1st
At the end of the process, the surface of the recycled roadbed (4) is quite rough, and there are considerable voids (5) inside. Following the first step, in the second step, a slurry-like mixture (hereinafter simply referred to as slurry-like mixture) consisting of H blue emulsion, fine aggregate, filler, etc. is filled and coated from the recycled roadbed surface (CIII).
become that way. (6) is a slurry-like mixture that fills the gaps (5) and rough surfaces (4) in the recycled roadbed, and
By covering the recycled roadbed surface, it will be recycled as f1M blue pavement, which is dense, waterproof, waterproof, and durable.

Next, the road restoration method of the present invention will be explained in the order of construction.

We will mix and design the additive amount of bitumen emulsion, cement, etc. for the treatment group that stabilizes the surface layer (including the top and base layer) and the roadbed of the existing E-blue pavement and the pavement materials that make up the treatment group.

A deep stabilizer is generally used as a construction machine for scraping, crushing, and mixing pavement in the first step. Further, if necessary, the surface layer or a part thereof can be crushed using a brainer, ripper, etc. When the additive is bituminous emulsion, use a deep stabilizer to apply the required amount to the paved surface! While spreading the emulsion, the roadbed or roadbed is scraped from the pavement surface to a predetermined depth, crushed and mixed, and the bituminous emulsion is mixed with the crushed material and spread evenly.

When the additive material is cement, the required amount of cement is spread evenly on the pavement surface, stirred up to the specified depth using a deep stabilizer, crushed and mixed, and the cement is mixed with the crushed material. Spread evenly. When using bituminous emulsion and cement, the above method is used in combination. That is, after the required amount of cement is spread on the pavement surface, the required amount of bitumen emulsion is spread on the pavement surface with a deep stabilizer, stirred with a shackle to a specified depth, crushed and mixed, and the crushed material is crushed and mixed. Mix cement and bitumen emulsion and spread it evenly. In addition, the additives can be applied by mixing cement in an emulsion and then spraying it, or by dispersing cement in water to make cement milk and then spraying it.

After the mixture is spread evenly, unevenness is leveled using a grader, etc., and compacted by thorough compaction using tire rollers, macadam rollers, vibrating rollers, etc., to form a recycled roadbed.

Before performing this first step, if necessary, new aggregate (for example, cut crushed stone, granulated crushed stone, etc.) can be spread and supplemented on the paved surface, and then the first step can be performed.

The recycled roadbed made in the first step has voids inside.
The surface is uneven and rough. In particular, the voids in the upper part of the recycled roadbed and the uneven particle size of the crushed material are noticeable.

Next, in step 432, the recycled roadbed is filled with a slurry-like mixture consisting of bituminous emulsion, fine bones υ, filler, and the like. That is, a slurry-like mixture of fine aggregate, filler, etc. and bituminous emulsion is poured onto the recycled roadbed and subjected to vibration, or it is poured and then a vibrating roller is applied to fill the voids in the recycled roadbed. . Once filled, pour more water and give it vibration.

By repeating this operation, the voids inside the recycled roadbed can be sufficiently filled with the slurry mixture. Other methods include using high-pressure air to spray the slurry mixture onto the reclaimed roadbed surface and filling it inside, or pouring the slurry mixture onto the reclaimed roadbed surface and forcing it to fill without rubbing with a rubber rake or the like. The method can also be applied. In addition, by simply pouring the slurry mixture onto the surface of the recycled roadbed, some amount of the slurry mixture can be filled inside by its own weight.

By using the above operations appropriately, the voids in the reclaimed roadbed can be filled to a large extent. After the internal filling is completed, the slurry mixture is spread over the reclaimed roadbed surface to form a predetermined coating.

Then, as the slurry mixture decomposes and the water dissipates, it is recycled into a dense bituminous pavement that is waterproof, water resistant, and durable.

Next, the main materials used in the road reclamation method of the present invention will be explained. 3. The bitumen emulsion used in the present invention is generally an asphalt emulsion. For example, in addition to an asphalt emulsion corresponding to JI-8K 2208 petroleum asphalt emulsion, asphalt emulsions obtained by modifying asphalt with rubber, elastomer, resin, lubricating oil, process oil, etc. can also be used. Further, anionic, cationic, nonionic, clay, etc. can also be used.

Portland cement is generally used as the cement, but other types include silica cement, fly ash cement, blast furnace cement, ultra-early strength cement, jet cement,
Alumina cement, expandable cement, etc. can also be used. Still used in conjunction with cement.

Admixture and the like can be used in combination as necessary.

The amount of 'dM fJ emulsion and cement added to the treatment materials for the surface layer of the pavement and the roadbed in the first step is approximately 3 to 6% by weight based on the total weight of these materials.

When both are used together, the ratio of cement and Y1 blue emulsion (converted to 60% by weight of evaporation residue) is 1 to 1.
It is preferable to use about 3 parts by weight of bituminous emulsion per part by weight.1 The slurry-like mixture of bituminous emulsion, fine aggregate, filler, etc. in the second step is a mixture of fine bone 4A1 filler, etc. and lj bituminous emulsion. . Coarse sand, fine sand, screenings, etc. are used as the fine aggregate.

As the filler, stone powder, slaked lime, fly assy, cement, etc. are used. Usually, the aggregate of the slurry mixture is mainly fine aggregate, and a small amount of filler is added as necessary. The amount of bituminous emulsion in the slurry mixture (based on 60% by weight evaporation residue) is approximately 10-15% by weight. In special cases, it is also possible to use a mixture of bituminous emulsion and filler without fine aggregate.

The use of cement as a filler is effective as it accelerates the decomposition of the bituminous emulsion. When using cement as a filler, the ratio of cement to bitumen emulsion is preferably about 12 parts by weight of bitumen emulsion to 1 part by weight. C/
For E, it is about 1/12.

Using this as the standard, the ratio C/J' is changed taking into account the properties of the aggregate, the properties of the reclaimed roadbed, etc. The viscosity of this slurry-like 6η compound can be changed freely, but for internal filling,
The consistency is preferably about 16 to 30 seconds in blowing time using a J-funnel according to the Prepact Concrete 1/Guidelines proposed by the Japan Society of Civil Engineers.

Next, the features, effects, etc. of the present invention will be explained.

In the conventional roadbed construction method, after a reclaimed roadbed is formed, a surface layer of heated asphalt mixture (thickness 3 to 10c7n) is paved on top of the roadbed in the 11th corner where there are many voids. This rough road surface becomes bulkier. This also resulted in problems such as the paved surface being higher than the entrance in areas where residents were responsible for housing.

When forming this recycled roadbed, dfA blue emulsion, cement, etc. are mixed with the surface layer of the pavement and the crushed material of the roadbed, and the mixture is spread and compacted. At that time, after leveling the surface, a grader is used to smooth out the unevenness in order to make the finished surface smooth, but this also causes the surface to become rough. Furthermore, generally speaking, the thickness of this I bloodwork is about 20 to 40 holes. Therefore, the thickness of the thin layer in the on-road mixing method 1 is 5 to 10. Compared to z, the aggregate particle size of the crushed material is larger and becomes irregular and non-uniform. Compared to the central mixing method (plant method), non-uniformity in aggregate particle size is unavoidable, but the variation is large and the interlocking of the aggregates is not sufficient, inevitably creating voids inside. There was a problem.

To deal with this, when using the reclamation method of the present invention, (1) a second step of filling the voids inside and on the surface of the reclaimed roadbed with a slurry mixture and forming a surface coating layer is applied to the first step of forming the reclaimed roadbed. , the problems with recycled roadbed have been resolved and the pavement has been recycled into a dense, waterproof, water-resistant, and durable pavement.

(2) Since the recycled roadbed formed in the first step is strengthened in the second step, there is no need for surface finishing with a heated mixture as in the conventional method. Therefore, there is no need to raise the surface layer by paving it, and the finished surface can be made to the same level as the auxiliary structure.

(3) Filling the voids in the recycled roadbed with a slurry mixture,
By combining the aggregates, the interlocking bond between the aggregates can be made sufficient, and the strength and durability of the pavement are significantly improved.
d.

(4) By filling the voids in the recycled roadbed and the voids on the surface with the slurry mixture, it is possible to prevent rainwater from seeping into the pavement.

(5) It is possible to correct the unevenness and unevenness of mixing found in recycled roadbed, and to create a smooth and dense surface.

(6) The slurry-like mixture is integrated with the reclaimed roadbed as a strong protective layer of the reclaimed roadbed.

(Sword is economical.

Next, examples of the present invention will be described.

Example 1゜Existing rJ! 1'i blue pavement (surface layer dense grained asphalt concrete thickness 6c1n1 roadbed (crushed stone roadbed) thickness 20c1n
) with ordinary portland cement in? Using a deep stabilizer, apply cationic petroleum asphalt emulsion MK-3 to 27 per 11T1.
The road surface is scraped up to a depth of 21 cm, crushed and mixed, and the crushed material is mixed with cement and asphalt emulsion and the mixture is spread out. Next, unevenness is leveled using a grader, and a recycled roadbed is formed by sufficiently rolling the road using tire rollers and macadam rollers.

Coarse sand 34% by weight, Screenings 50% by weight,
A slurry-like mixture of 2% by weight of ordinary Portland cement, 14% by weight of cationic asphalt emulsion (Mi(-3)), and a small amount of water was mixed with a cement mortar mixer and poured onto the recycled roadbed surface, and then mixed with a rubber rake. Carefully spread it evenly and compact it with a Bomanoku vibrating roller.

Since it is filled immediately, pour in the slurry mixture, spread it out with a rubber rake, and apply it with a vibrating roller. This operation was repeated to fill the inside and surface of the container with about 20 tons of the slurry mixture. Next, a slurry mixture was spread on the surface to a thickness of about 6 mm, and after decomposition of the emulsion, the mixture was rolled with a roller to complete the recycled pavement of the present invention.

The surface of this pavement is dense and smooth, there is almost no bulkiness on the finished surface, it has excellent waterproofness and water resistance, and has very good durability after use.

[Brief explanation of the drawing]

The drawings are cross-sectional views showing changes in bituminous pavement by the road restoration method of the present invention in relation to the process. In the figure, [I] is a cross-sectional view of the existing bituminous pavement before the first step, [■] is a cross-sectional view of the bituminous pavement after the first step, and [1] is the cross-sectional view of the existing bituminous pavement after the first step. A cross-sectional view of the bituminous pavement after the second step is shown. The symbols in the figure are as follows. (1) is the surface layer or surface/base layer of the existing Kiseyo pavement; (2)
) indicates a circuit board. A indicates the thickness of (1), I3 indicates the thickness of (2), and )1 indicates the thickness of A-1-13. (3) shows the recycled roadbed. (4) shows the surface of the recycled roadbed, and (5) shows the voids within the recycled roadbed. (6) is a slurry mixture consisting of bituminous emulsion, fine bone, filler, etc. Patent applicant c group] Procedural amendment (formality) j Indication of case 1982 Patent Application No. 98020 2 Name of the invention! Road restoration method for bituminous pavement 3 Relationship with the case of the person making the amendment Representative of the patent applicant Jun Sakaguchi 4 Nikkan of the order for amendment August 10, 1983 5 1-Details of the invention in the specification to be amended "Explanation" and Contents of Amendment (1) Road reclamation method of the present invention described in page 4, line 18 to η to page 5, line 18 of the specification. ” is corrected as if it were a written sentence. 1. Changes in the cross section of a bitumen pavement by the road restoration method of the present invention are illustrated in relation to the process. That is, FIG. 1 shows a cross-sectional view of the already installed lFf:blue pavement before the first step, and FIG. 2 shows a cross-section of the bituminous pavement after the first step, and FIG. 3 shows a cross section of a bituminous pavement subjected to a second step following the first step. In the figure, (1) 1 is the surface layer (i.e., surface layer, surface, base layer) of the existing θ Piyo pavement, (2) is the existing 1F
The roadbed of the fW pavement is shown. A is the surface layer (thickness of IJ) in the existing bituminous pavement, 13 is the thickness of the subbase (2) in the existing j!P+blue pavement, and l-1 is the thickness of the surface layer (1) and the subgrade ( 2) shows the total thickness of the roadbed. (3) shows the recycled roadbed. The recycled roadbed (3) at the stage where the first step is completed is
As shown in the figure, its surface (4) is quite rough;
There is a considerable void (5) inside. Following the first step, in the second step, the surface (4) of the recycled roadbed (3) is filled and coated with a slurry-like mixture (hereinafter simply referred to as the slurry-like mixture) consisting of bituminous emulsion, fine aggregate, filler, etc. , as shown in FIG. (6)
is a slurry-like mixture, which fills the voids (5) in the reclaimed roadbed (3).
In addition to filling the rough surface of the surface (4), the reclaimed roadbed (3)
) is recycled as a dense bituminous pavement with excellent waterproofness, water resistance, and durability. (2) The section "Brief explanation of drawings" written in lines 4 to 17 on page 15 of the specification will be amended to make it a codified text. 14. Brief description of the drawings The drawings show the changes in the bituminous pavement by the road restoration method of the present invention in relation to the process, and Figure 1 shows the existing bituminous pavement before the first step. 2 is a cross-sectional view of the bituminous pavement after the first step, and FIG. 3 is a cross-sectional view of the bituminous pavement after the second step has been performed following the first step. A cross-sectional view is shown. The symbols in the figure are as follows. (1) is the surface layer of the existing bituminous pavement (2) is the roadbed of the existing bituminous pavement (3) is the recycled roadbed (4) is the surface of the recycled roadbed (5) is the void in the recycled roadbed (6) is the bituminous emulsion. Slurry mixture A consisting of fine aggregate, filler, etc. is the surface layer thickness of the existing bituminous pavement B, the subgrade thickness H of the existing bituminous pavement is the total thickness of the existing bituminous pavement (A″+B) J(3)
Correct the drawing as shown in the attached sheet.

Claims (1)

[Claims] Bituminous emulsion and/or cement is spread or spread on the existing bituminous pavement surface, and at a predetermined depth of the roadbed or roadbed is scraped, crushed, mixed, spread, and compacted. A recycled roadbed is formed, and then a slurry-like mixture consisting of +lff1 blue emulsion, fine aggregate, filler, etc. is filled into the voids inside the recycled roadbed, and the surface of the recycled roadbed is filled with the slurry-like mixture. 't'1. ': Blue, 1 ali road' - Regeneration construction method.