JPH093814A - Construction method for glass pavement - Google Patents

Abstract

PURPOSE: To prevent a drop in the strength of a pavement main body by sprinkling glass cullets precoated with a binder as aggregates on the pavement main body and fixedly pressing the aggregates into the pavement main body by means of roller compaction. CONSTITUTION: An asphalt mixture 5, which forms an asphalt main body on a bed rock 4, is rolled with an asphalt pavement machine 3. Glass bottles or the like collected as waste articles are crushed and subdivided and then they are cleaned under the adjustment of their particle sizes. Aggregates 6 by glass cullets precoated with a thermoplastic resin binder on the surface are sprinkled on the surface of a paved asphalt mixture 5. The aggregates are pressed into the asphalt mixture 5 by roller compaction and anchored. This construction makes it possible to prevent a drop in the strength of the pavement main body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road paving material (aggregate) by crushing recovered glass bottles with a crusher and subdividing them into smaller pieces.
The present invention relates to a method for constructing a glass pavement for effective use in the field.

[0002]

2. Description of the Related Art Conventionally, it has been researched to use glass cullet obtained by crushing glass waste material by a crusher into small pieces and using it in a general asphalt mixture for road paving in the same manner as natural aggregate. Part of the glass cullet mixed in the asphalt mixture appears on the pavement surface, and at night
When illuminated by the headlights of automobiles, it has a glittering property. This brilliance of the pavement surface attracts the attention of the driver who is driving on the roadway, 1 and is considered to be suitable for use as a traffic safety measure. Also,
The entire pavement road surface does not shine, but a part of the glass cullet protruding on the pavement surface is diffusely reflected and shines as if the light is scattered, so that the effect on the design surface is also exhibited.

Further, as a traffic safety measure, a method of coating a thermosetting epoxy resin on the pavement surface and scattering glass beads on the coated surface is known and practiced. This method is characterized by the fact that the glass beads are spherical, so that the reflected light returns to the direction of the generation source, and the driver of the car may have difficulty in driving due to the dazzling light of the car he is driving.

[0004]

The conventional method of spraying glass beads described above has a structure in which glass beads are attached to the pavement surface, and the repeated load of traffic and the loss of the lower pavement structure, etc. As a factor, peeling of glass beads from the pavement surface is often found. By the way, the glass cullet subdivided by the crusher has the same crushing shape and particle size distribution as the natural aggregate used for general road pavement asphalt mixture, and is included in the road pavement aggregate. It is possible in principle to use it. However, since the glass cullet surface has low roughness and low water absorption, it has properties different from natural aggregate in this respect.
That is, the adhesive effect of the asphalt coated on the glass cullet cannot be expected. There are countless -O on the glass cullet surface.
It is easily expected that the presence of the H group makes it easy to wet with water, which causes the asphalt coating to peel off from the glass cullet and cause a decrease in strength of the pavement base.

Therefore, an object of the present invention is to provide a construction method using glass cullet as an aggregate of a roll door asphalt pavement method as a means for obtaining the brightness of the glass cullet on the pavement surface without causing a decrease in the strength of the pavement base. Is to provide. The next object of the present invention is to provide a method for constructing a glass pavement that secures the durability of the glass cullet fixed on the pavement surface in order to maintain road safety measures and landscape pavement features for a long time. is there.

[0006]

As a means for solving the above-mentioned problems of the prior art, in the method for constructing a glass pavement according to the invention of claim 1, glass bottles and the like recovered from scraps are crushed and subdivided. Among them, by precoating a coating of a thermoplastic resin binder material on the surface of the glass cullet that has been cleaned by adjusting the particle size, after spreading the asphalt mixture to be the paving matrix on the roadbed, and then precoating the glass on the surface The cullet is sprayed as an aggregate, and the aggregate is pressed into the mother body by roller rolling to be fixed.

The aggregate described in claim 1 is sprayed on the surface of the pavement base immediately after the heat when the binder material is pre-coated is allowed to cool, or immediately without being allowed to cool, and is press-fit by roller rolling. The dispersion of the aggregate described in claim 1 or 2 is performed relatively thinly and uniformly so that the glass cullets do not overlap each other.

In the aggregate described in claim 1, the finely divided glass cullet has a particle size of about 8 to 3 mm and is adjusted to exclude a flat shape, and the surface of the adjusted glass cullet is thermoplastic. It is manufactured by pre-coating a resin binder to a film thickness of several microns to several tens of microns. The aggregate according to claim 1 or 4 heats the adjusted glass cullet to around 170 ° C, while having a softening point of 40 ° C.
A thermoplastic resin binder material having high transparency at the time of curing at ˜70 ° C. is heated to 170 ° C. to 180 ° C., and both are mixed by a mixer. Then, after mixing, the mixture is allowed to cool at room temperature, and again stirred with a mixer to separate each grain for production.

Next, the press-fitting of the aggregate according to claim 1 by the roller compaction is performed separately for the initial compaction, the secondary compaction and the finish compaction. The initial rolling pressure is performed using an iron wheel roller having a weight of about 4 tons, the watering is suppressed, and the surface of the iron wheel roller is heated to 80 to 100 ° C. The asphalt mixture is spread and leveled, and immediately after the aggregate is sprayed, the compaction is performed until the aggregate is sufficiently embedded in the asphalt mixture.

The secondary compaction is performed mainly by compacting the pavement base by using a Macadam roller or a vibrating roller of 8 to 10 tons and water is sprayed on the roller surface. For finish rolling, a tire roller of about 15 tons or a vibrating roller with a rubber cover attached to an iron wheel is vibrated and sufficiently pressed.

[0011]

[Function] Since the asphalt pavement uses glass cullet as the aggregate, it is possible to make the road surface illuminated by the headlight shine brilliantly without the strength of the pavement base being lowered. Since the shape of the glass cullet is not spherical, the amount of reflected light from the headlights returning to the light source is small, and no glare is felt. Rather, the reflected light is characteristically diffused reflection that is easier to confirm from the position of the oncoming vehicle (see FIG. 3).

Since the glass cullet is on the pavement surface, the road surface shines and the driver is alerted while driving. In addition, the texture of the pavement surface makes the surface rough so that the skid resistance is maintained even if the road surface is wet. It is possible to build a paved road that is hard to slip. Compared with the conventional asphalt pavement construction method in which the aggregate is mixed in the asphalt mixture, the construction method of the present invention increases the amount of glass cullet protruding on the pavement surface, so that the above-mentioned respective effects are increased.

In the present invention, since the glass cullet is used as the aggregate, the road surface illuminated by the headlight shines brightly. Since the road surface shines attention to the driver who is driving, it is effective for traffic safety measures by installing it near intersections where traffic accidents are likely to occur or mountain roads without lighting equipment. Further, the brilliance of the road surface has a design effect because the entire adjusted pavement surface does not shine depending on the irradiation angle but shines at points.

[0014]

Embodiments of the present invention will be described below. First. Manufacture of Aggregate In order to use glass cullet as an aggregate in asphalt pavement, it is necessary to improve the property that the glass cullet does not easily peel off from the pavement surface. It is also necessary to have a shape with good fixing properties when it is pressed into the pavement base. Therefore, the aggregate is manufactured as follows. Adjustment of glass cullet Glass bottles, etc. from which waste products have been collected are crushed by a crusher and subdivided. By screening, those with a particle size of about 8 mm to 3 mm are selected, and those with a flat shape are excluded. Use one that does not have crushed dust or dirt on the surface. Therefore, a cleaning process is also performed if necessary. This is because it is necessary to have a high fixability to the pavement base. Pre-coating The glass cullet to be sprayed on the surface of the paving base is pre-coated with a highly transparent thermoplastic resin-based binder material so as to enhance the adhesiveness with the paving base and not prevent the reflection of light. FIG. 1 shows the precoating state of the glass cullet, where 1 is the glass cullet and 2 is the binder coating. As a property of the binder material, it is expected that the temperature of the pavement base will be 140 to 160 ° C. when it is press-fitted into the pavement base, and it is easy to melt under this temperature environment and have a performance capable of having integrity with the main body. It is essential. The addition amount of the precoat binder material is such that the glass cullet surface can be covered with a sufficient film thickness.
Therefore, the binder material has a softening point of 40 ° C to 70 ° C.
And asphalt and modified asphalt. Those containing an additive that improves the adhesion effect of the glass cullet to the surface are also preferably used.

In order to precoat the surface of the glass cullet to a uniform coating thickness of several microns to several tens of microns, the glass cullet is preheated to about 170 ° C. The purpose of heating is also to remove water adhering to the surface of the glass cullet and to prevent a rapid temperature decrease of the precoat resin coated with a thin film. The binder material having thermoplasticity is heated to a temperature of 170 to 180 ° C. that can secure a film thickness of several microns to several tens of microns. The binder material is well agitated in a state where the viscosity is lowered by heating to make the material uniform.

As described above, the glass cullet and the precoat resin are mixed by using a mixer when the temperature conditions of both of them are adjusted. After confirming that the binder material has sufficiently adhered to the surface of the glass cullet, it is allowed to cool at room temperature to form a coating layer. The cooled glass cullet is put into the mixer again, and the glass cullet is separated from the glass cullet to remove the adhesion. Second. Pavement of paving base and spraying of aggregates In paving work, first, asphalt mixture 5 to be the paving base is spread on roadbed 4 as shown in FIG. 2A. This leveling is performed using the asphalt paving machine 3 as before. Next, on the surface of the paved asphalt mixture 5, as shown in FIG.
As described above, the aggregate 6 made of glass cullet is evenly dispersed (chipping). Chipping is performed relatively thinly and uniformly so that the glass cullets do not overlap. In the above particle size and shape, the target amount of the aggregate 6 is 1.0 to 1.5 kg / cm ² per unit area. Third. Roller compaction Next, roller compaction is divided into initial compaction, secondary compaction and finish compaction.

In the initial rolling step, the iron wheel roller 7 having a weight of about 4 tons is used in order to prevent the glass cullet from being crushed and to effectively press in the aggregate 6. The initial compaction does not sprinkle water so as not to impair the fixing of the aggregate 6 and the asphalt mixture 5. The surface of the iron wheel roller 7 is 80 to 100 °
It is heated to C, and the pre-coated glass cullet is rolled without being attached to the roller. The initial compaction is performed immediately after the asphalt mixture 5 is spread and leveled and the aggregate 6 is chipped, until the aggregate 6 is sufficiently embedded in the pavement base 5. The temperature control at this time varies depending on the type of binder material, but the temperature at the time of mixing is 10 to 20.
It is performed within the range where the temperature has decreased by about ° C.

The secondary compaction is performed mainly by compacting the pavement base using a Macadam roller or a vibrating roller of 8 to 10 tons. At this time, water is sprayed on the roller surface to prevent the aggregate 6 from adhering. Also, be careful not to crush the aggregate 6 during traveling and vibration. In order to prevent adhesion to the roller surface, it is effective to adjust the start time by controlling the temperature of the paved surface. Temperature control may differ depending on the type of pre-coated binder material, but it should be noted that aggregates generally tend to adhere to the roller surface when the softening point temperature is significantly exceeded, and this is to be prevented. Therefore, it is preferable to start the compaction when the temperature of the surface portion of the pavement base has dropped to 70 to 80 ° C.

Finish rolling compaction increases the density of the pavement surface,
In order to further fix the chipped aggregate on the pavement base 5, it is performed while vibrating with a vibrating roller having a rubber cover attached to a tire roller or iron ring of about 15 tons, and press-fitting the aggregate sufficiently into the pavement base. . In addition, a construction method is further implemented in which the aggregate pre-coated with the binder material is immediately sprayed without being left to cool, thereby further improving the fixing property with the pavement base. In this case, precoat treatment is performed at the pavement site for each required amount. Roller rolling and press fitting are performed as described above.

[0020]

[Effects of the Present Invention] Effects of Traffic Safety Measures The brightness of the paved road surface obtained by the construction method of the present invention mainly draws attention to the driver of an oncoming vehicle, and particularly on a mountain road which tends to lack illumination lights. It is possible to promptly notify the presence of an oncoming vehicle around the curve.
In addition, in a tunnel or the like, it can be expected that the diffusely reflected light plays an auxiliary role for the lighting equipment. Further, the unevenness of the pavement surface has the effect of preventing the formation of a water film on the road surface and preventing the slip resistance from decreasing. Therefore, great expectations can be placed on the prevention of traffic accidents. Effect on design Since the light on the pavement surface is scattered, the brightness reflected by the light of the illumination lamp provides the design effect as a landscape pavement. Recycling effect When the construction method of the present invention is applied, it is possible to add value to the waste glass material (glass cullet) that has been conventionally landfilled, and it can be used as an effective by-product. Further, as a result, the amount of waste disposal can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a glass cullet precoated with a binder material.

2A to 2C are process diagrams of a construction method of the present invention.

FIG. 3 is an explanatory diagram of light reflection on a glass paved road.

[Explanation of symbols]

 1 Glass cullet 2 Binder film 4 Roadbed 5 Asphalt mixture (paving base) 6 Aggregate

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshio Yonezawa 1-5 Otsuka, Inzai-cho, Inba-gun, Chiba Incorporated Takenaka Corporation Technical Research Institute (72) Inventor Shinichiro Ando 8-21-1 Ginza, Chuo-ku, Tokyo No. Takenaka Civil Engineering Co., Ltd. (72) Inventor Toshiaki Yamada 8-21-1 Ginza, Chuo-ku, Tokyo Stock Corporation Takenaka Civil Engineering (72) No. 21-21 Yasuhiro Naganawa, Ginza, Chuo-ku, Tokyo Stock company Takenaka road (72) Inventor Shuji Kitao 1-3-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Toyo Glass Co., Ltd.

Claims (6)

[Claims] 1. Pre-coating a thermoplastic resin binder material on the surface of glass cullet whose particle size has been adjusted and cleaned out of crushed and crushed waste glass bottles, etc., which becomes a paving base on a roadbed. After laying out an asphalt mixture, spraying the precoated glass cullet as an aggregate on its surface, the aggregate is press-fitted into the paving matrix by roller rolling, and fixed, respectively, Construction method of glass pavement. 2. The glass according to claim 1, which is characterized in that after the heat during precoating is allowed to cool, it is sprayed onto the surface of the base material and then press-fitted by roller rolling pressure. Pavement construction method. 3. A method for constructing a glass pavement, characterized in that the dispersion of the aggregate according to claim 1 or 2 is performed relatively thinly and uniformly so that the glass cullets do not overlap each other. 4. The aggregate according to claim 1, wherein the finely divided glass cullet has a particle size of about 8 to 3 mm and is adjusted to remove the flat shape, and the surface of the adjusted glass cullet is heated. A method for constructing a glass pavement, characterized in that a plastic resin binder is pre-coated to a film thickness of several microns to several tens of microns to be manufactured. 5. The thermoplastic resin according to claim 1, wherein the adjusted glass cullet is heated to around 170 ° C. and has a softening point of 40 ° C. to 70 ° C. and high transparency when cured. A glass produced by heating the binder material to 170 ° C to 180 ° C, mixing both with a mixer, allowing to cool at room temperature after mixing, stirring again with the mixer, and performing separation treatment. Pavement construction method. 6. The press-fitting of the aggregate according to claim 1 by the roller compaction is divided into an initial compaction, a secondary compaction and a finish compaction, and the initial compaction is an iron wheel roller having a weight of about 4 tons. The surface of the iron wheel roller is 80 to 100 ° C.
The mixture is heated to 0, and the asphalt mixture is spread and leveled. Immediately after spraying the aggregate, it is performed until the aggregate is sufficiently embedded in the asphalt mixture, and the secondary rolling pressure is 8-10 tons of macadam roller or vibrating roller. Mainly used for compaction of the paving base and spraying water on the surface of the roller, and the final rolling pressure is about 15 tons, which is vibrated by a tire roller or a vibrating roller with a rubber cover attached to an iron wheel, and press-fitted sufficiently. A method of constructing a glass pavement, which is characterized in that