JP5639627B2 - Earth-based pavement construction method and soil-based pavement - Google Patents

Description

  The present invention relates to an earth-based pavement, and more particularly to an earth-based pavement that reuses waste tiles.

  The earth-based pavement is obtained by solidifying an earth-based material with a binder such as cement or resin. The pavement that makes use of the shade of the earth is in harmony with the natural landscape, and it has moderate elasticity and shock absorption, and is softer and less slippery than ordinary asphalt pavement. For this reason, it is widely used for walking trails and walkable plazas on walkways, promenades, parks, sports facilities, and historical buildings.

  In particular, there is a demand for reusing waste tiles from an area where it is difficult to dispose of waste tiles, and many earth-based pavements that reuse waste tiles as aggregates have been proposed (for example, Patent Document 1).

  The waste tile is porous, and the earth-based pavement (waste tile pavement) of the waste tile aggregate is excellent in water permeability and water retention. Since it has excellent water retention, it has a heat island suppression effect and is also applied in urban areas.

JP 2010-133090 A

  In conventional waste tile pavement, waste tile aggregate, sand, water, and solidified material are mixed and laid by a dedicated machine (for example, a concrete mobile car). As the solidifying material, there are resin type, cement type, lime type, asphalt type, etc., and these solidifying materials may be used in combination. As the resin-based solidifying material, an epoxy resin or a urethane resin is used as a main material. Ordinary cement, blast furnace cement, lime, and magnesium cement are mainly used as cement-based solidifying materials. Straight asphalt is used as the asphalt solidifying material system.

  Conventional waste tile pavement is generally performed at room temperature. As a result, the following problems arise.

  In particular, when the air temperature is 5 ° C. or lower after construction, such as in winter or in cold regions, there is a possibility that the solidified material may be hardened. In principle, when the temperature is 5 ° C. or lower, the construction is not performed. However, actually, the temperature may be 5 ° C. or lower after the start of the construction due to a change in weather. In addition, a sufficient curing period is required for solidifying at room temperature. In particular, it may be cured for nearly 10 days in winter and cold regions. Thus, it is not easy to construct in winter or cold regions.

  In addition, there are other problems as follows.

  The solidifying agent used in the waste tile pavement of the prior art is liable to crack due to curing shrinkage, and as a result, the road surface is likely to be roughened with service. Moreover, the conventional waste tile pavement is excellent in water permeability and water retention, but is easily eroded by rainwater and the like, and is easily affected by freezing and thawing (freezing and breaking of the pavement) in cold snowy areas. There was a problem related to such durability.

  Also, the number of dedicated machines (for example, concrete mobile vehicles) is small. Therefore, there are cases where mechanized construction cannot be performed, construction efficiency is poor, and as a result, the construction unit price becomes high. In addition, when mechanized construction is not possible, the quality tends to vary. That is, there was a problem related to mechanized construction.

  This invention solves the said subject, and it aims at providing the construction method of the earth-based pavement which is easy to construct also in winter and a cold region. Furthermore, it aims at providing the construction method of the earth-based pavement which is durable and suitable for mechanized construction.

  The present invention is a method for construction of earth-based pavement, wherein waste tile aggregate, sand, stone powder, asphalt is heated and mixed to form an earth-based pavement mixture, and the earth-based pavement mixture is spread and leveled, Roll and compact the ground pavement mixture that has been leveled.

  Since the heat-mixed earth-based pavement material mixture has heat energy and solidifies by cooling, it is difficult to be affected by low-temperature outside air even in the winter season or cold districts, and is easy to construct. Moreover, if it becomes below the predetermined temperature after construction, the subsequent curing is unnecessary.

  Furthermore, since asphalt is used for a binder, durability is good. It is the same as a general asphalt pavement construction method and is suitable for mechanized construction.

  More preferably in the above invention, the asphalt is decolorized asphalt.

  Thereby, the color of a waste tile can be utilized.

  More preferably, in the above invention, a color coloring material is added during the heating and mixing.

  Thereby, a hue can be adjusted.

  In the above invention, more preferably, at the time of the heating and mixing, 1.0% by weight or less of titanium white of the earth-based paving material mixture is added.

  Decolorized asphalt is not completely colorless and has a slightly yellowish color. This makes it possible to make better use of the original color of the waste tile and facilitate the adjustment of the color.

  More preferably, in the above invention, the earth-based paving material mixture is set to 160 to 185 ° C. during the heating and mixing. More preferably, the earth-based paving material mixture is set to 165 to 175 ° C. during the heating and mixing.

  When the earth-based paving material mixture is less than 160 ° C., the asphalt hardly exhibits a function as a binder. On the other hand, if the temperature is higher than 185 ° C., color unevenness may occur. Thereby, the color of a waste tile can be utilized.

  In the above invention, more preferably, in the earth-based pavement mixture, the waste tile aggregate particle size is 30 mm or less, and the aggregate composition is waste tile aggregate 50 to 70 wt%, fine sand 24 to 44 wt%, The stone powder is 5 to 7% by weight, and the asphalt weight is 7 to 10% by weight of the earth-based paving material mixture.

  By adjusting the formulation, the surface roughness, water permeability and water retention can be adjusted.

  More preferably, in the above invention, the earth-based pavement material mixture is heated and mixed in a mixture factory, transported by a dump truck, and spread with an asphalt finisher.

  By mechanized construction, construction efficiency is good and the quality is uniform, resulting in a low construction unit price. What is necessary is just to utilize what is used for construction of general asphalt pavement for a compound material factory, a dump truck, and an asphalt finisher.

  The present invention forms an earth-based paving material mixture obtained by heating and mixing waste tile aggregate, sand, stone powder, and asphalt, and leveling the earth-based paving material mixture, and converting the leveled earth-based paving material mixture. It is an earth-based pavement formed by pressing and compacting.

  According to the present invention, it can be easily constructed even in winter or in a cold region as compared with the prior art. Furthermore, it has good durability, is suitable for mechanized construction, has high construction efficiency and uniform quality.

It is a schematic sectional drawing of earth-based pavement. Aggregate particle size distribution of soil pavement mixture

~ Construction ~
An example of the construction method of the earth-based pavement of this embodiment is demonstrated. FIG. 1 is an example of a schematic configuration of an earth-based pavement. An earth-based pavement material 2 having a thickness of about 40 mm is laid on the roadbed 1 having a thickness of about 100 mm.

  First, the roadbed 1 is formed at the construction site, and the unevenness is shaped. Furthermore, a soil-based paving formwork is installed on the roadbed 1.

  On the other hand, an earth-based pavement material mixture (details will be described later) is manufactured at a mixture factory. Add the waste brick aggregate, sand and stone powder of the specified composition to the mixer, add decolorized asphalt as a binder, add color coloring material and titanium white when adjusting the color, and mix by heating. . At this time, the temperature at the time of mixing is kept constant at about 170 ° C., and is not overheated. When the earth-based paving material mixture is less than 160 ° C., the asphalt hardly exhibits a function as a binder. On the other hand, when the temperature exceeds 185 ° C., color unevenness may occur.

  Keep close contact between the construction site and the material factory. The heat-mixed soil-based paving material mixture is quickly transported to the construction site by a dump truck.

  At the construction site, the earth-based paving material mixture is put into the hopper of the asphalt finisher from the dump truck, and the earth-based paving material mixture is spread to 1.2 times the finished thickness with the asphalt finisher.

  The ground pavement mixture that has been leveled is compacted by compaction with compact rollers and plates. The number of rolling is about 3 times. The temperature at the time of compaction is controlled to be 150 to 160 ° C.

  If it cools to the predetermined temperature (for example, 50 degreeC) or less after construction, the subsequent curing is unnecessary. It can be used only with a curing period of several hours.

~ Soil-based paving material mixture ~
A blending example of the earth-based paving material mixture of the present embodiment will be described. The aggregate composition is preferably 50 to 70% by weight of waste tile aggregate, 24 to 44% by weight of fine sand, and 5 to 7% by weight of stone powder. The weight of the decolorized asphalt is preferably 7 to 10% by weight of the earth-based paving material mixture.

  Increasing the amount of waste tile aggregate results in a rough paving with a rough surface finish. When the amount of waste tile aggregate is reduced and the amount of fine sand is increased, the surface finish becomes a smooth earth-based pavement. Furthermore, when increasing the amount of fine sand, the amount of decolorized asphalt is also increased.

Table 1 is an example of aggregate composition. It is shown in wt%. The earth-based pavement material mixture is a mixture of aggregate and asphalt. Note that the aggregate denominator is the aggregate aggregate weight, and the decolorized asphalt denominator is the soil pavement mixture weight.

The particle size of the waste tile aggregate is preferably 30 mm or less. In this embodiment, waste tile aggregate having a particle size of 2.5 to 10.0 mm is used. Actually, a small amount of waste tile aggregate less than 2.5 mm or more than 10.0 mm is included but can be ignored. Table 2 shows the properties of waste tile aggregate.

Using waste tile aggregate with the properties shown in Table 2, waste tile aggregate, sand, and stone powder are mixed in the composition shown in Table 1. Table 3 shows the aggregate particle size distribution of the earth-based pavement mixture. It is shown as a passing mass percentage. FIG. 2 is a graph of Table 3.

~ Property test ~
A property test of the earth-based pavement of the present embodiment was performed, and it was confirmed whether the standard value in the prior art was satisfied.

First, a Marshall stability test was performed to measure stability and flow characteristics. Table 4 shows the test results of the Marshall stability test. It was confirmed that both the stability and flow characteristics satisfy the standard values in the prior art.

Next, a slip resistance test and an elasticity test were performed, and a BPN value and an elasticity coefficient were measured. Table 5 shows the test results of the slip resistance test and the elasticity test. It was confirmed that both the BPN value and the elasticity coefficient satisfy the standard values in the prior art.

  As described above, it was confirmed that the earth-based pavement of the present embodiment has the same properties as those of the prior art.

~effect~
The earth-based pavement of the present embodiment has the same properties as those of the prior art, and has the same effects as the conventional technology. In other words, the colors of the waste tiles are used to harmonize with the natural landscape. It has moderate elasticity and shock absorption, and has a softer walking feeling and less slipping than general asphalt pavement. Moreover, it is excellent in water permeability and water retention and has a heat island suppression effect. Waste tiles can be reused and the burden on the environment is low.

  Moreover, by adjusting the aggregate composition, the surface roughness, water permeability and water retention can be adjusted. Moreover, the hue can be adjusted by coloring.

  Furthermore, the earth-based pavement of the present embodiment is easier to construct in winter and cold regions than the conventional technology, has good durability, and is suitable for mechanized construction.

  That is, in the prior art, normal temperature construction is common, and in winter and cold areas, it is easily affected by low-temperature outside air, and there is a possibility that the solidified material will be hardened. In particular, a sufficient curing period (for example, 10 days) is necessary in winter and cold regions. Thus, it is not easy to construct in winter or cold regions.

  On the other hand, in this embodiment, since the earth-based pavement material mixture is heated to about 170 ° C. and mixed, heat energy is maintained. Asphalt with thermal energy is solidified by cooling, it is less affected by low temperature outside air even in winter and cold areas, and the quality is stable. Moreover, if it becomes below predetermined temperature (for example, 50 degreeC), the subsequent curing will be unnecessary. It can be used with only a few hours of curing. In this way, construction in winter and cold regions is easy.

  Further, in the prior art, cracks due to hardening shrinkage of the solidifying agent are likely to occur, and as a result, the road surface is likely to be roughened in service. In addition, it is easily eroded by rainwater and is susceptible to freezing and thawing in cold snowy areas. There was a problem related to such durability.

  On the other hand, in the present embodiment, since heated asphalt is used, cracks due to curing shrinkage do not occur. In addition, asphalt appropriately waterproofs the waste tile aggregate while maintaining water permeability and water retention, so that it is not easily eroded by rainwater or the like and is not easily affected by freezing and thawing. Thus, durability is good.

  Furthermore, mechanical construction may be difficult with the prior art, and the construction efficiency is poor, resulting in a high construction unit price.

  On the other hand, this embodiment diverts a general asphalt pavement construction method and is suitable for mechanized construction. By performing mechanized construction, construction efficiency is improved, and as a result, the construction unit price is reduced.

  Another effect of the earth-based pavement of the present embodiment will be described. In this embodiment, the color of waste tiles can be utilized by using decolorized asphalt.

  By the way, decolored asphalt is not completely colorless and has a slightly yellowish color. For this reason, it may be difficult to perform fine color adjustment. By adding titanium white, it is possible to make better use of the original color of the waste tile and to facilitate the adjustment of the color.

  In this embodiment, since the earth-based paving material mixture is heated so as not to exceed 185 ° C., and more preferably not to exceed 175 ° C., the occurrence of color unevenness can be prevented. Thereby, the color of a waste tile can be utilized.

~ Modification ~
In the said embodiment, although the mass construction by mechanization construction was demonstrated, in the case of a small amount construction, it is good also as a manual construction. Even general asphalt pavement construction methods should be human-powered for small-scale construction. Therefore, the construction method of asphalt pavement with a small amount of construction may be diverted. The effects related to mechanized construction cannot be obtained, but other effects can be obtained.

  In the above embodiment, a color coloring material and titanium white are added for fine color adjustment. However, when fine color adjustment is not necessary, the color of waste tile can be utilized even without these.

  The numerical values such as the temperature of the earth-based pavement mixture shown in the above embodiment are examples for assisting understanding, are not limited to this, and have a range within the scope of the technical idea of the present invention.

  Asphalt other than decolorized asphalt may be used for the binder, but the color of the asphalt is affected, and there is a possibility that the color of the waste tile cannot be utilized.

~ Supplement ~
The present invention constructs an earth-based pavement composed mainly of waste tile aggregate by a general asphalt pavement construction method.

  The earth-based pavement is mainly constructed by using cement or resin as a binder and is performed at room temperature, and it is difficult for those skilled in the art of earth-based pavement to have the idea of heating the earth-based pavement mixture.

  On the other hand, asphalt pavement is used on roadways in large quantities, so strength is a concern for those skilled in the art. Since sufficient strength cannot be obtained with waste tiles, the idea of using waste tiles as aggregates is unlikely to occur. Moreover, since waste tiles are porous, those skilled in the art of asphalt pavement have a preconception that they will absorb asphalt and increase raw material costs. Therefore, the idea of using waste tiles as aggregates did not occur.

  As a result, there was no technical idea of constructing an earth-based pavement mainly composed of waste tile aggregate by a general asphalt pavement construction method. The inventors of the present invention completed the present invention as a result of repeating the test construction and repeatedly examining the test results.

1 Roadbed 2 Earth-based paving material

Claims (8)

Waste tile aggregate, sand that is finer than the waste tile aggregate, stone powder finer than the sand, and asphalt are mixed by heating to form an earth-based paving material mixture, the earth-based paving material mixture A method for constructing a soil-based pavement, comprising: leveling and compacting the ground-smoothed soil-based pavement mixture by rolling.   The construction method for earth-based pavement according to claim 1, wherein the asphalt is decolorized asphalt.   The method for constructing an earth-based pavement according to claim 2, wherein a color coloring material is added during the heating and mixing. Wherein upon heating the mixing, the construction method of soil-based pavement according to claim 2 or 3, characterized in that the addition of 1.0 wt% or less of titanium white of the soil-based paving material mixture. The earth-based pavement construction method according to any one of claims 2 to 4 , wherein the earth-based pavement material mixture is set to 160 to 185 ° C during the heating and mixing. In the earth-based paving material mixture, the particle size of waste tile aggregate is 30 mm or less, the sand is fine sand, and the aggregate composition is waste brick aggregate 50-70% by weight, fine sand 24-44% by weight. The method for constructing earth-based pavement according to any one of claims 1 to 5, wherein the stone powder is 5 to 7% by weight, and the asphalt weight is 7 to 10% by weight of the earth-based pavement mixture. . The earth-based pavement construction according to any one of claims 1 to 6 , wherein the earth-based pavement material mixture is heated and mixed in a compound factory, transported by a dump truck, and spread by an asphalt finisher. Method. Forming an earth-based paving material mixture in which waste tile aggregate, sand, which is finer in aggregate than the waste tile aggregate, stone powder having finer particle size than the sand, and asphalt are mixed by heating, are laid. A soil-based pavement formed by rolling and compacting the leveled soil-based pavement material mixture.

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