JPH09195216A - Construction method of freezing suppressed pavement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pavement easy to construct and excellent in durability. SOLUTION: A pavement layer 2 having voids is formed by use of a rough aggregate 3 containing an asphalt binder 5 and a fine aggregate 4. After the upper surface 2A of the pavement layer 2 is smoothly finished, an impregnant 6 formed of a resin showing elasticity after hardening is filled in the voids. Thus, the floe on the upper surface 2A of the pavement layer 2 is broken by the elastic deformation by the pass of a vehicle, whereby freezing preventing function can be provided. The upper surface 2A of the pavement layer 2 is excellent in durability, and satisfactory strength and flatness can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antifreezing pavement construction method used for pavement in cold regions.

[0002]

[Problems to be Solved by the Invention] On a paved road in winter in a cold region, a freezing phenomenon of the road surface due to a temperature decrease is likely to occur. As the freezing phenomenon, fresh snow accumulates on the road surface and is compacted by the load of a tire of a traveling vehicle. There is a state of squeezed snow and a state of icy ice that melts and freezes again. In such a frozen state, the friction between the tire and the road surface is reduced, which hinders the safe running of the vehicle due to adverse effects such as starting on a slope and slippage.

For this reason, although the performance of the tires of a vehicle has been improved while traveling on an icy road, there are insufficient aspects.
In recent years, it has been desired to prevent freezing by the pavement road itself and improve ice breakage. And as a method for preventing freezing in this field, firstly, a method of spraying a chloride-based material on the road surface and using the freezing point depression of the chloride solution to prevent freezing, and secondly, of the paved road A method of burying a heating wire or a water pipe in the lower part and heating the pavement with electric heat, heated water or ground water, and thirdly, a method of mixing chloride or an elastic material into the pavement material are known.

In the first method, calcium chloride, sodium chloride, magnesium chloride, C
Since it is sprayed using MA (calcium, magnesium, acetate), etc., the antifreeze effect does not continue for a long time, and the complicated work of spraying each time as needed is required. Excessive effects on the environment are also expected.

In the second method, although a relatively stable antifreezing effect can be obtained, the construction of the paved road surface becomes complicated and difficult, and if the heat source wiring or piping is damaged, it can be easily repaired. However, there is a problem that construction cost and running cost are increased.

Further, the third method is a method of mixing a material such as chloride or rubber into the pavement material, and at the time of construction,
Attention must be paid to the temperature control and compaction of the material, and there is a problem in terms of durability and durability of the paved road surface. For example, Japanese Patent Laid-Open No. 7-224407 discloses a paving coarse aggregate, a paving fine aggregate having a particle size smaller than that of the paving coarse aggregate, an asphalt-based binder, and a fluidity property for a predetermined time. A freezing-controlled pavement has been proposed in which a surface layer is formed with an elastically deformable elastic body that hardens after a lapse of time. In this freezing-controlled pavement, as shown in FIG. Before finishing to a flat surface, an elastic body is used to finish the uneven upper surface, so the work of finishing the elastic body becomes complicated, and this type of paved road requires a predetermined strength and flatness in design. On the other hand, it is expected that the predetermined strength and flatness will not be obtained after the construction. Furthermore, the pavement road by the above-mentioned freeze control pavement is also used outside the winter season, but if the finish on the pavement surface is uneven, the traveling property will be impaired due to vibration and the elastic body on the surface will be easily worn. It has a poor durability.

Therefore, an object of the present invention is to provide an antifreeze pavement which is easy to construct and has excellent durability.

[0008]

According to a first aspect of the present invention, a pavement layer having voids is formed from a pavement material containing an asphalt mixture, and after the upper surface of the pavement layer is finished to be flat, the voids are cured. This is a freezing-suppressing pavement construction method in which an injection material made of a resin having elasticity is filled. The ice plate on the upper surface of the pavement layer is destroyed by elastic deformation caused by the passage of a vehicle, and the injection material made of a resin is used after the pavement layer is finished flat. Therefore, the paved road is excellent in durability and good strength and flatness can be obtained.

According to a second aspect of the invention, the injection material is
It is a freezing-suppressing pavement construction method in which vulcanized pulverized rubber is mixed with the resin, and it is possible to increase the elasticity of the injection material after curing,
Further, since the amount of relatively expensive resin used can be reduced, the injection material becomes inexpensive and the construction cost can be reduced.

Further, the invention of claim 3 is a freeze-preventing pavement method in which the injection material is a modified emulsion prepared by mixing a modifier into an asphalt emulsion and vulcanized pulverized rubber, and is relatively expensive. Since the cost of the injection material is lower than that of the resin and the modifier has excellent fluidity, it is possible to smoothly fill the voids.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show an embodiment of the present invention. In the present invention, by injecting a highly fluid injection material having a resin as a binder into an open particle size asphalt concrete having a large void diameter, and utilizing the high elasticity obtained by curing the injection material, excellent durability is achieved. Provide an elastic type antifreeze pavement.

Referring to the drawings, 1 is a pavement lower layer, 2 is a pavement layer made of open-grained asphalt concrete formed on the pavement lower layer 1, and a bone as a pavement material used for the pavement layer 2 The material is coarse aggregate 3, such as crushed stone,
A material used for ordinary asphalt concrete such as fine aggregate 4 such as sand or stone powder is used, and the porosity A, which is the volume ratio of the voids in the pavement layer 2, is 17% or more. In order to smoothly inject the injection material 6, the porosity A
Is preferably 22% or more. Further, an asphalt-based binder 5 is used as a binder for the coarse aggregate 3 and the fine aggregate 4. There is no particular limitation on the maximum particle size of the coarse aggregate 3, but if the maximum particle size becomes small, the injection of the injection material 6 will not be performed smoothly, so 13 mm (millimeter) or more is preferable. The grain size width of the coarse aggregate 3 is
In order to make the void diameter generated in the pavement layer 2 as large as possible, a narrower one is preferable, and it is preferable to use coarse aggregate that is made as single grain as possible. That is, if the particle diameters of the coarse aggregates 3 are different, the small coarse aggregates enter between the large coarse aggregates and the voids become small, whereas the particle diameters of the coarse aggregates 3 are uniform. In this case, a relatively large void can be formed between the coarse aggregates 3.

The pavement layer 2 has a standard thickness of 20-5.
It is 0 mm. The asphalt-based binder 5 used for the pavement layer 2 may be straight asphalt, modified Ι, ΙΙ-type asphalt, high-viscosity asphalt, semi-blown asphalt, or the like. It is selected according to the volume, road alignment, surrounding environment such as weather conditions.

The resin serving as the base material of the injection material 6 has a high fluidity in a closed container (not shown), is cured after a lapse of a certain time when exposed to air, and has elasticity and flexibility after the curing. Those having excellent adhesiveness and having the ability to follow expansion and contraction are used, and for example, epoxy resin, polyurethane resin, urethane resin, silicone resin and the like are used. These resins can be used alone as the injection material 6, and the vulcanized pulverized rubber 70
It is also possible to use them in a mixture of not more than wt%. The vulcanized pulverized rubber is a wide temperature range obtained by applying a suitable treatment such as heating without adding sulfur or other vulcanizing agent to the raw material rubber to form a strong bond between rubber molecules. This vulcanized pulverized rubber was pulverized into powder or granules using a rubber obtained by changing plastic flow over a range, increasing elasticity and tensile strength, and reducing swellability by a solvent. For example, crushed old tires made of vulcanized rubber are used. in this case,
When the vulcanized and pulverized rubber is mixed in the injection material 6 in an amount of more than 70% by weight, the viscosity becomes too high, and the fluidity of the injection material 6 is lost, so that the filling is insufficient or the pavement layer 2 is mixed with the material. Adhesiveness is reduced, which is not preferable. On the other hand, in order to improve elasticity by mixing vulcanized and pulverized rubber, 10% by weight is required.
It is preferable to mix the above vulcanized pulverized rubber. That is, when less than 10% by weight of vulcanized and pulverized rubber was mixed, the elasticity was not improved so much. The particle size of the vulcanized and crushed rubber is in the range of 0.01 to 10 mm, preferably about 3 mm. Further, when the mixing amount of the vulcanized and pulverized rubber increases, the fluidity of the injection material 6 decreases,
If sand such as natural sand or silica sand is mixed to improve the fluidity of the injection material 6, good fluidity can be obtained. The amount of sand mixed for this purpose can be selected within the range of 35% by weight or less, which is smaller than that of the vulcanized crushed rubber, and when the amount of sand mixed is greater than that of the vulcanized crushed rubber, the elasticity of the injection material 6 after curing is increased. It lowers and the original function of destroying the ice plate is reduced.

The injection material 6 which has been sufficiently kneaded is injected into the pavement layer 2, but in this case, it is not necessary to fill the entire thickness of the pavement layer 2 and a half of the upper surface of the pavement layer 2 is about 10 mm or more. Even in the permeated state, elasticity can be obtained, and the ice board breaking effect can be obtained. With such semi-penetration, the durability is inferior to that obtained by filling the entire pavement layer 2, but there is no problem with light traffic roads. Further, on a road having a relatively high traffic volume, it is desirable that the asphalt used for the pavement layer 2 is a modified asphalt having higher durability.

2 and 3 show steps of the pavement construction method according to the present invention, in which a pavement layer 2 is formed on the upper surface of a pavement lower layer 1 composed of an asphalt mixture or a roadbed, and as shown in FIG. The upper surface 2A, which is the road surface, is spread and leveled, compacted by a compacting machine 10 such as a roller, and the upper surface 2A is finished flat to form a pavement layer 2 having voids. As a result, the pavement layer 2 is provided with predetermined strength and flatness. In this state, the pavement layer 2 is completed in a state similar to what is called water-permeable pavement. After finishing the pavement layer 2 flat in this way, the injection material 6 is filled to the desired depth as described above, and the injection material 6 on the upper surface 2A is leveled by a rake (not shown) if necessary. Alternatively, the upper surface 2A is vibrated by a vibrating device (not shown) to perform filling, and
Is cured to complete the antifreeze pavement shown in FIG.

In the pavement layer 2 constructed in this way,
As shown in FIG. 4, when the load of the tire 11 of the vehicle is applied to the upper surface 2A, strain is generated and the pavement layer 2 is elastically deformed.
The coarse aggregate 3 which is a hard material has a small strain, and the hardened pouring material 6 has a large strain. Therefore, due to the difference in the strain generated between the two, the ice disk 12 formed on the upper surface 2A also has a large strain. Distortion occurs, and the ice board 12 is destroyed at various points on the upper surface 2A.

Tables 1 and 2 below show the physical properties of the resins and vulcanized and ground rubbers used in the experimental examples. The asphalt binder (straight asphalt 60/80, modified ΙΙ type asphalt) used in the experimental examples and the comparative examples was of standard quality.

[0019]

[Table 1]

[0020]

[Table 2]

Experimental Example 87% by weight of crushed stone No. 6 which is coarse aggregate 3, 5% by weight of natural sand which is fine aggregate 4, and 4% by weight of straight asphalt 60/80 which is the binder 5 are added to these, and the mixture is sufficiently mixed. The heat-mixed product was compacted to obtain a pavement layer 2 having a thickness of 25 mm and a porosity A of 25%.

As the injection material 6, a modified epoxy resin was used, which was sufficiently kneaded with 60% by weight of resin, 25% by weight of powdered vulcanized pulverized rubber, and 15% by weight of natural sand.

The filling of the injection material 6 into the pavement layer 2 naturally penetrates because the injection material 6 has sufficient fluidity in a standard composition, and finishes the upper surface 2A flat with a rake or the like. However, if the mixture contains a large amount of vulcanized pulverized rubber or the pavement layer is thick, the upper surface 2A should be vibrated with a vibration compactor, which is a vibrating device, in order to improve the filling property. Is effective, and after pouring the injection material 6 evenly on the upper surface 2A, waiting for the injection material 6 to harden, a frozen pavement having elasticity is obtained.

Experimental Example In this example, approximately half the thickness of the pavement layer 2 is filled with the injection material 6. No. 6 crushed stone 80 which is coarse aggregate 3
% By weight, 11.5% by weight of natural sand as fine aggregate 4 and 4% by weight of stone powder, and 4.5% by weight of modified ΙΙ-type asphalt as binder 5 are added to these, and the mixture is heated and mixed tightly. After hardening, a pavement layer 2 having a thickness of 25 mm and a porosity A of 20% was obtained.

As the injection material 6, a modified silicone resin was used, and 40% by weight of the resin, 40% by weight of powdered vulcanized and pulverized rubber, and 20% by weight of granular vulcanized and pulverized rubber were sufficiently kneaded. An injection material 6 having a mixture with a large amount of crushed rubber and a slightly low fluidity was obtained.

The filling of the casting material 6 into the pavement layer 2 was carried out in the same manner as in the above-mentioned experimental example to obtain the antifreezing pavement in which the casting material 6 was filled to a depth of 15 to 20 mm from the upper surface 2A.

Experimental example 92% by weight of crushed stone No. 6 which is coarse aggregate 3, 4% by weight of stone powder which is fine aggregate 4 and 4% by weight of straight asphalt 60/80 which is a binder 5 are added thereto and heated sufficiently The mixed material was compacted to obtain a pavement layer 2 having a thickness of 40 mm and a porosity A of 30%.

As the injection material 6, an asphalt emulsion modified by mixing rubber as a modifier was used, and 80% by weight of this emulsion and 20% by weight of powdered vulcanized and ground rubber were sufficiently kneaded. . Although not used in this experimental example, as the modifier, a resin having excellent adhesiveness and a property of following expansion / contraction can be used. Epoxy resin, polyurethane resin, urethane resin, silicone A resin such as a system resin can be used. Further, a modified emulsion obtained by improving the asphalt emulsion with both rubber and resin may be used. Also in this example, the injection material 6 was such that the modified emulsion was mixed in an amount of 30% by weight or more and the vulcanized pulverized rubber was 70% by weight, and the vulcanized pulverized rubber was 70 to 70% by weight for the same reason as described above.
It is preferably 10% by weight.

The filling of the casting material 6 into the pavement layer 2 was performed in the same manner as in the above-mentioned experimental example to obtain the antifreezing pavement in which the casting material 6 was filled to a depth of 15 to 20 mm from the upper surface 2A.

Comparative Example Further, a comparative example for comparing the physical properties with each of the above-mentioned experimental examples is based on the asphalt pavement summary (Japan Road Association), and is a dense-grained asphalt mixture generally used on a road in a snowy cold region. A pavement layer using (13F) was prepared.

Regarding the above experimental example and comparative example,
According to the Pavement Test Manual (Japan Road Association), a labeling test (wear amount) to evaluate wear resistance and a wheel tracking test (dynamic stability) to evaluate flow resistance are performed, and A destructive test was performed. Wheels to be used in the wheel tracking device are formed on the test piece 21 consisting of the pavement layer 2 of each of the examples under the environment of -10 ° C to form an ice disk 22 of 1 to 2 mm. 23 to 5 to 7 kg
It was made to traverse to the left and right with a ground pressure of f / cm ² and the ice cracks were visually observed. Table 3 below shows the test results of each experimental example together with the comparative example.

[0032]

[Table 3]

It can be seen from Table 3 that in each of the examples, a value equal to or higher than that of the comparative example is obtained, and in particular, the wear amount for evaluating the wear resistance is significantly reduced in the pavement layer according to the present method. The characteristics were seen. Further, in the ice breaking test, cracks could be confirmed in all the experimental examples as compared with the comparative example in which no change was observed. Especially in the experimental example, since the silicon-based resin has a characteristic that it is hard to freeze,
The phenomenon of peeling from the top surface was observed.

As described above, in this embodiment, in accordance with claim 1, the paving layer 2 having voids is formed by the coarse aggregate 3 and the fine aggregate 4 which are the paving materials containing the asphalt-based binder 5, and This is a construction method in which the upper surface 2A of the pavement layer 2 is finished flat and then the pouring material 6 made of a resin having elasticity after curing is filled in the voids. Therefore, the ice on the upper surface 2A of the pavement layer 2 is elastically deformed by passing the vehicle. Since the board 12 can be destroyed to obtain the anti-freezing function, and after the pavement layer 2 is finished flat, it is filled with the injection material 6 made of a resin having fluidity before curing. The upper surface 2A of No. 2 has excellent durability and good strength and flatness can be obtained. Generally, the anti-freezing function is required only in a relatively short period such as winter, but according to this construction method, stable running of the vehicle can be ensured even during the period other than winter, and the durability is excellent. Will be things.

As described above, according to this embodiment, the second aspect
Corresponding to the above, since the injection material 6 is a method in which vulcanized pulverized rubber is mixed with resin, the elasticity of the injection material 6 after curing can be increased, and the amount of relatively expensive resin used can be increased. Since the injection material 6 can be reduced,
Construction costs can be reduced.

Further, as described above, in this embodiment, in response to the third aspect, the injection material 6 is a modified emulsion obtained by mixing a modifier such as rubber or resin into an asphalt emulsion and vulcanized pulverized rubber. This is a freezing-suppressing pavement construction method, and the injection material 6 is less expensive than the case where only the resin is used as the injection material 6, and the modifier has relatively good fluidity so that filling into the voids is smooth. Can be done. Further, since the asphalt emulsion alone flows down through the voids, the voids cannot be filled, but the use of a modifier makes it possible to fill the voids and obtains good elasticity after curing.

Further, as an effect of the embodiment, by using a silicone resin as the resin, it is possible to obtain a peeling effect in addition to the ice breaking function. Further, by using the vulcanized and crushed rubber obtained by crushing old tires, the injection material 6 becomes relatively inexpensive. In addition, as the injection material, a resin, 35% by weight or less of vulcanized pulverized rubber, and 35% by weight or less of sand such as natural sand or silica sand are mixed, and the amount of the sand is less than that of the vulcanized pulverized rubber. As a result, the fluidity of the injection material 6 can be ensured, good elasticity of the injection material 6 after curing can be ensured, and the amount of resin used can be reduced. Further, when the filling material 6 is filled, the paving layer 2 is vibrated by the vibrating device, so that the filling can be performed without unevenness.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, the thickness of the pavement layer and the filling thickness of the injection material can be appropriately selected. In addition, the vulcanized pulverized rubber is
The vulcanized rubber is not limited to a crushed one, but includes a vulcanized rubber formed in a powdery or granular form in advance.

[0039]

According to the first aspect of the present invention, a pavement layer having voids is formed by a pavement material containing an asphalt mixture, and the upper surface of the pavement layer is finished to be flat, and then the resin having elasticity after curing in the voids. This is a freezing-suppressing pavement method that is filled with an injection material that consists of an ice material on the top surface of the pavement layer is destroyed by elastic deformation caused by the passage of a vehicle, and the paved road surface has excellent durability and good strength and flatness. A control pavement construction method can be provided.

According to a second aspect of the present invention, the injection material is
It is a freeze-suppressing pavement construction method in which vulcanized pulverized rubber is mixed with the resin, the ice board 12 on the upper surface of the pavement layer is destroyed by elastic deformation due to vehicle passage, and the durability of the pavement road surface is excellent,
A good strength and flatness can be obtained, and a freezing-suppressing pavement construction method can be provided.

Further, in the invention of claim 3, a pavement layer having voids is formed by a pavement material containing an asphalt-based binder, and after the upper surface of the pavement layer is finished to be flat, the voids are provided with elasticity after curing. An antifreeze pavement construction method for filling an injection material having, wherein the injection material is an antifreeze pavement construction method in which vulcanized pulverized rubber is mixed with a modified emulsion in which a modifier is mixed with an asphalt emulsion, The ice disk 12 on the upper surface of the pavement layer is destroyed by elastic deformation due to, and the pavement road surface is excellent in durability, and good strength and flatness are obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of an antifreezing pavement showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a compacting operation of a pavement layer showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating an operation of filling a pavement layer with an injection material according to an embodiment of the present invention.

FIG. 4 is a partially enlarged cross-sectional view illustrating the destructive action of the ice board according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating an ice breaking test showing an example of the present invention.

[Explanation of symbols]

 2 Pavement layer 3 Coarse aggregate (pavement material) 4 Fine aggregate (pavement material) 5 Asphalt binder 6 Injection material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Manabu Takahashi 2031 Nakanoshima, Ogata, Nishikawa-cho, Nishikanbara-gun, Niigata Prefecture Fukuda Road Co., Ltd.

Claims (3)

[Claims] 1. A pavement layer having a void is formed from a pavement material containing an asphalt-based binder, and the upper surface of the pavement layer is finished to be flat, and the void is filled with an injection material made of a resin having elasticity after curing. Freezing-suppressing pavement construction method characterized by filling. 2. The anti-freezing pavement construction method according to claim 1, wherein the injection material is formed by mixing vulcanized pulverized rubber with the resin. 3. Freezing in which a pavement layer having voids is formed from a pavement material containing an asphalt-based binder, the upper surface of the pavement layer is finished to be flat, and then the voids are filled with an injection material having elasticity after curing. The anti-freezing pavement construction method, wherein the injection material is formed by mixing vulcanized ground rubber with a modified emulsion obtained by mixing a modifier with an asphalt emulsion.