JP2002105907A - Field recycling method for paving waste material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain easily and quickly heating mine tailing compliances provided with conditions for substantial conditions for substantial restorations in the field and further provide a field restoring method for the waste member for pavement which can restrain the functions for retaining the function for the heating materials while smoothly laying them. SOLUTION: This subject is a recycling treatment method for paving waste materials which are disclosed from a field, where a far infrared ray heater 1 is installed to provide with a far infrared ray heater 4. The temperature control during the heating recycling treatment process and the temperature control after heating recycling process and before spreading the waste material are carried out. And further, a recycling additive constituted of a field recycling softening agent and an asphalt reformer is added during the heating recycling disposal time to recover the penetration as the feature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reclaiming pavement waste on site.

[0002]

2. Description of the Related Art When installing manholes, burying pipes such as gas pipes or water pipes, and repairing or inspecting existing buried pipes, the pavement surface of asphalt concrete is temporarily broken to expose the roadbed. It is necessary to make excavation.

Conventionally, when asphalt concrete is broken for digging, after determining the excavation position, the surface asphalt concrete is cut by a concrete cutter, and then the asphalt concrete in the cut area is crushed by an engine breaker, and the crushed asphalt concrete is cut. Concrete mass (ascon mass) is often treated as waste material (hereinafter referred to as ascon waste material).
Such ascon waste materials are transported from a construction site to a regeneration plant, and are used for heat regeneration treatment.

[0004] On the other hand, when the asphalt pavement surface is restored, a room temperature mixture or a heated mixture is used. Room temperature mixture can be transported, stored, and constructed at room temperature, and thus has the advantage of being easy to use, but has the disadvantage of being inferior in stability and durability in the initial stage of construction. On the other hand, the heated mixture is a mixture obtained by mixing coarse aggregate, fine aggregate, filler and asphalt at a predetermined ratio and then heating, and has excellent stability and durability. For this reason, the use of a heated mixture is desired as the mixture for this restoration.

As the heating mixture, coarse-grained ascon is used for the base layer, and fine-grained and fine-grained ascon is used for the surface layer. In general, the optimum temperature at the time of compaction after laying is 110 degrees Celsius. The temperature is controlled so as not to lower the strength.
Conventionally, when using this heated mixture to restore asphalt road surfaces at an excavation site, the heated mixture is delivered from the factory to the excavation site by a dump truck at the completion time of the subgrade construction, and is ready for immediate construction. Is done.

[0006]

If asphalt concrete generated during pavement surface cutting is directly disposed of as waste material, it may not be suitable for environmental protection, which has been increasingly demanded in recent years. Moreover, when a new heated mixture is taken in for the restoration, not only the labor of transportation but also the pavement cost including the purchase cost may increase.

Therefore, it has been proposed to recycle asphalt concrete lumps, so-called ascon waste materials, on site (for example, JP-A-59-404). The above-mentioned publication discloses a method in which ascon waste material introduced into a rotating drum is brought into contact with a burner flame to be heated and melted to regenerate the ascon waste material. However, the heated mixture regenerated by the method disclosed in the above-mentioned publication is insufficient for the permanent restoration of the pavement surface. That is, although one of the characteristics required for the heating composite material for the main restoration is the penetration, the penetration of the heating composite using only the heat regeneration process does not provide the penetration described above for the main restoration. is the current situation. The following can be considered as a reason for this. Coarse aggregate, fine aggregate, filler and asphalt are mixed in a predetermined ratio in the heat recovery mixture for this restoration, so that stability and durability are ensured.
However, conditions for obtaining the above-mentioned stability and durability have not been established for ascon waste materials that have just been heated and regenerated on site. Therefore, the penetration, which is the most important factor of the characteristics of the heated mixture for the main restoration, cannot be obtained, and it is difficult to adopt the penetration for the main restoration.

[0008] In the case where ascon waste material is heated and regenerated on site, it is necessary to maintain a predetermined temperature to form a heated mixture until the regenerated ascon waste material is spread on the site as described above. However, simply performing the heat regeneration treatment cannot maintain the function as the heated mixture.

An object of the present invention is to solve the above-mentioned conventional problem of reclaiming waste pavement on site, and to easily and quickly obtain a heat-mixed material having conditions for the main restoration at the site, and to improve the quality of the paving material. In the meantime, it is an object of the present invention to provide a method for reclaiming pavement waste material that can maintain its function as a heated mixture.

[0010]

In order to achieve this object, an invention according to claim 1 is a method for regenerating a pavement waste material at a site where the waste material is discharged, wherein the waste material can be stored. A far-infrared heater is provided in the heating device to control the temperature during the heat regeneration process and the temperature management before the spread after the heat regeneration process, and to use the in-situ regeneration softener and asphalt modifier during the heat regeneration process. It is characterized by recovering the penetration by adding the constituted regeneration additive.

According to a second aspect of the present invention, there is provided the method for reclaiming pavement waste in-situ according to the first aspect, wherein the regenerating additive is a distillate obtained by distilling heavy crude oil under reduced pressure as an in-situ regenerating softener. In addition, a shortcut fiber made of an acrylic resin is used as an asphalt modifier.

[0012]

According to the first and second aspects of the present invention, when regenerating ascon waste material on site, the temperature control for the heat regenerating process and the temperature control before the spreading work can be performed in the same place. Therefore, it is possible to maintain the function as a heated mixture after the on-site regeneration without considering the transportation from the plant factory, etc., and to quickly provide the work for spreading. In addition, the regenerating additive can be added at the time of the regenerating treatment to restore the penetration as the reclaimed paving agent, so that the on-site use can be quickly performed. In particular, in the invention according to claim 2, since a short-cut fiber made of an acrylic resin is used as an asphalt modifier in addition to the asphalt softener as a regeneration additive, excess oil can be absorbed by the addition of the softener. Thus, functional deterioration of the regenerated pavement material can be suppressed.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial external view showing a heating device used in the on-site regeneration processing method according to the embodiment of the present invention. In FIG. 1, a heating device 1 includes a drum-shaped container 2 having a space for accommodating ascon waste material S, an openable / closable lid member 3 that can cover an upper opening surface of the container 2, and a lid member 3. The apparatus includes a far-infrared heater 4 provided on the inner surface and a stirring member 5 having a stirring blade 5A located in the housing space. The container 2 is provided so as to be tiltable via a hinge connecting portion (not shown) so that the recycled ascon waste material can be poured out. The lid member 3 has a skull shape, and far-infrared heaters 4 are provided at a plurality of locations on the inner surface. The far-infrared heater 4 is arranged so that a heat ray spreads over the entire accommodating space for the ascon waste material S in the container 2 on the inner surface of the lid member. In the example shown in FIG. It is divided into a plurality of parts along the longitudinal direction of each position (the state indicated by reference numeral 4A in FIG. 1). As shown in FIG. 2, the arrangement of the far-infrared heaters 4 is such that a plurality of the far-infrared heaters 4 are arranged circumferentially (see FIG. 2A) or a configuration in which the far-infrared heaters 4 are juxtaposed in a rectangular shape (FIG. 3).
(See (B)), and in any case, it is divided (the state indicated by reference numeral 4A in the figure) so that a plurality of heating regions are formed in the accommodation space for the ascon waste material S.

FIG. 3 is a block diagram for controlling the temperature of the heating device 1 shown in FIG. 1. In FIG. 3, a far-infrared heater 4 provided in the heating device 1 is provided.
The operation of the stirring member 5 is controlled by the control unit 6. The control unit 6 is mainly composed of a microcomputer, and a temperature sensor 7 for detecting the temperature in the housing space is connected to the input side via an I / O interface (not shown), and a stirring member is connected to the output side. An electric motor 8 and a far-infrared heater 4 used as a drive source for the motor 5 are connected to each other via a drive unit (not shown). As the electric motor 8, a motor whose rotation speed can be changed according to the output from the control unit 6 is used. The temperature sensors 7 are provided at the bottom of the container 2 and the like for the divided heating areas of the far infrared heater 4 and detect the heat dose from the far infrared heater 4 based on the temperature. In the present embodiment, instead of detecting the temperature in the storage space of the ascon waste material S as the temperature sensor 7,
The temperature of the far infrared heater 4 itself may be detected. Also in this case, the temperature of each heating area is detected.

The control unit 6 controls the temperature and the rotation of the stirring member 5 during the heating and regenerating process of the ascon waste material and after the regenerating process, until the ascon material is taken out of the accommodation space for spreading work. Has become. At the time of the heat regeneration process, a heating time of about 10 minutes is set at a temperature within 185 ° C. during the regeneration process based on the temperature management shown in FIG. To raise the temperature,
Perform softening and melting treatment. The control unit 6 monitors whether or not a required temperature is obtained in each heating area based on the above-described temperature management. Processing for increasing the output of the infrared heater 4 is performed. The rotation speed of the stirring member 5 at the start of heating and thereafter is changed. At the start of heating, the rotation speed is lower than the speed in the softened and molten state in order to promote the melting and softening of the ascon waste material S. It is said. Thereby, the heat ray irradiation to the ascon waste material S at the same location is continued. The rotation speed is switched to a speed corresponding to the degree of softening at a point in time when the ascon waste material S is melt-softened and monitored over time.

When the heat treatment at the above temperature is completed, the heating stop state is maintained for about 3 to 5 minutes, and the temperature is reduced to 1 degree Celsius by natural cooling.
After cooling to about 70 °, a temperature of about 3 to 5 minutes is required for spreading before the in-situ regeneration softener and asphalt modifier are added all at once as regeneration additives. The temperature is maintained at 110-185 degrees Celsius. When this temperature is maintained, not only is the temperature over the entire heating area uniformly monitored, but also some of the heating areas are selected to maintain heating, or the entire heating area is uniformly heated. If you want to keep the temperature
A method of correcting the temperature of the infrared heater at the location where the temperature has decreased is appropriately selected. This can prevent wasteful consumption of thermal energy for maintaining the temperature.

As the softening material for on-site regeneration used as the above-mentioned regeneration additive, a functional component for restoring the penetration of recycled asphalt, which is regarded as the most important among the quality standards of the recycled asphalt mixture, is used. Is applied to a distillate distilled under reduced pressure. In this embodiment, the amount of the softening agent for on-site regeneration is set to 10% or less of the asphalt amount. Asphalt modifier among the above additives, a shortcut fiber of an acrylic resin made of a fibrous material capable of absorbing the oil content of the recycled asphalt softened by the addition of the softener is used. It is used as a functional component that improves strength while maintaining softness by being able to be absorbed. In this example, the length of the short-cut fiber of the acrylic resin used as the asphalt modifier was 1
0 mm or less and an outer diameter of 100 μm or less are used, and an amount of 10% or less of the asphalt amount is added. As is clear from FIG. 5, the acrylic resin shortcut fiber is superior to the shortcut fiber of other resins in terms of oil absorption, weather resistance and adhesive strength. The result shown in FIG. 5 is a result of comparison under the same conditions for the length and the outer diameter of the fiber.

In the present embodiment, as the addition ratio of the softener and the asphalt modifier (addition amount / asphalt amount), a fixed amount was set so that the softener was 10% and the asphalt modifier was 5%. Prepare the agent in advance. The inventor of the present invention observed the penetration based on the above addition ratio, and obtained the results shown in FIG. FIG. 6 shows the relationship between the addition rate and the penetration, and it was confirmed that the penetration was 35 or more by setting the addition rate in the same figure. This penetration is
Based on Pavement Waste Recycling Technical Guidelines (Japan Road Association Regulations). Based on the above-mentioned addition rate, the addition amount according to the thickness of the asphalt pavement material to be regenerated is as shown in FIG. The amount of addition in this case covers a round hole having a diameter of 75 cm (recovery area = 0.44 m ² ).

When the regenerated dense asphalt mixture obtained in this example was compared with the existing method in light of the above-mentioned pavement waste material recycling technical guideline, the results shown in FIG. 8 were obtained. As is clear from FIG. 8, a result in which the penetration exceeds the reference value was obtained.

[0020]

According to the first and second aspects of the present invention,
Temperature control for heating and regeneration processing and temperature control before spreading work can be performed at the same place when regenerating ascon waste material at the site, so there is no need to consider transportation from the plant factory etc. The function as a heated mixture can be maintained after the on-site regeneration, and can be quickly provided for leveling work. In addition, the regenerating additive can be added at the time of the regenerating treatment to restore the penetration as the reclaimed paving agent, so that the on-site use can be quickly performed.
In particular, according to the second aspect of the present invention, since a short-cut fiber made of an acrylic resin is used as an asphalt modifier in addition to an asphalt softener as a regeneration additive, an excess oil component can be absorbed by the addition of the softener. Thus, functional deterioration of the regenerated pavement material can be suppressed.

[Brief description of the drawings]

FIG. 1 is a partial external view of a heating device used in a method for reclaiming pavement waste according to an embodiment of the present invention.

FIGS. 2A and 2B are diagrams illustrating an example of installation of a far-infrared heater provided in the heating device illustrated in FIG. 1; FIG. 2A illustrates an example in which the heater is arranged on a circumference; FIG. Examples are shown respectively.

FIG. 3 is a block diagram showing a configuration for performing temperature management of the heating device shown in FIG. 1;

FIG. 4 is a diagram for explaining temperature management performed by the configuration shown in FIG. 3;

FIG. 5 is a table showing comparison results of characteristics of one of the additives used at the time of in-situ regeneration.

FIG. 6 is a diagram for explaining the relationship between the additive rate and the penetration at the time of in-situ regeneration according to the embodiment of the present invention.

FIG. 7 is a table for explaining the relationship between the addition rate at the time of on-site regeneration and the thickness of asphalt pavement material to be regenerated according to the embodiment of the present invention.

FIG. 8 is a table showing the results of comparison with the existing method when the reference value of the fine-grained asphalt mixture regenerated according to the embodiment of the present invention is compared with the pavement waste material recycling technical guideline (issued by the Japan Road Association). .

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heating device 2 container 3 lid member 4 far-infrared heater 4A divided heating area 5 stirring member 6 control unit 7 temperature sensor 8 drive source of stirring member S pavement waste

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[Procedure amendment]

[Submission date] August 31, 2001 (2001.8.3)
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

An object of the present invention is to solve the above-mentioned conventional problem of reclaiming waste pavement on site, and to easily and quickly obtain a heat-mixed material having conditions for the main restoration at the site, and to improve the quality of the paving material. In the meantime, it is possible to maintain its function as a heated mixture ,
After digging a small area on the pavement surface
It is an object of the present invention to provide a method for reclaiming pavement waste on site that can simplify restoration work .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

In order to achieve this object, an invention according to claim 1 is a method for regenerating a pavement waste material at a site where the waste material is discharged, wherein the waste material can be stored. A far-infrared heater is provided in the heating device to control the temperature during the heat regeneration process and the temperature management before the spread after the heat regeneration process, and to use the in-situ regeneration softener and asphalt modifier during the heat regeneration process. It is characterized by recovering the penetration by adding the constituted regeneration additive quantitatively in accordance with a specified cutting area . ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 14, 2001 (2001.12.
14)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

Means for Solving the Problems In order to achieve this object, an invention according to claim 1 is a method of regenerating a pavement waste material at a site where the waste material is discharged, wherein the waste material can be stored. In addition to providing a far-infrared heater in a heating device to control the temperature during the heating and regeneration process and the temperature before the spreading after the heating and regeneration process, the on-site regeneration softener and asphalt modifier during the heating and regeneration process upon recovering the penetration by adding configure reproduction additive in, again the site
Apply softener and asphalt modifier to the specified cut area.
Depending on the thickness of the asphalt pavement to be recycled.
It is characterized in that it is prepared in a fixed amount in advance .

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shishin Satake 1-5-20 Kaigan, Minato-ku, Tokyo Inside Tokyo Gas Co., Ltd. (72) Inventor Masumi Kobayashi 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Co., Ltd. F-term (reference) 2D052 AA03 BA09 CA09 DA25

Claims (2)

[Claims] 1. A method for regenerating a pavement waste material at a site where the waste material is discharged, wherein a far-infrared heater is provided in a heating device capable of storing the waste material, and temperature management and heat regeneration during the heat regeneration treatment are performed. In addition to performing temperature control up to before laying after treatment and adding regeneration additive composed of in-situ regeneration softener and asphalt modifier at the time of heat regeneration treatment, the penetration is restored, On-site recycling method for used pavement waste. 2. The method of claim 1, wherein the distillate obtained by distilling heavy crude oil under reduced pressure is used as the on-site regenerating softener, and acrylic is used as the asphalt modifier. In-situ recycling of waste pavement, characterized in that shortcut fibers made of resin are used.