JP2000001354A - Road paving material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a paving material having little wear, little splashing of aggregates and largely improved clogging while keeping water permeability (water draining property) by mixing large aggregates and small aggregates in a resin in a way to satisfy specified conditions. SOLUTION: This paving material is produced by mixing a large aggregate 1 and a small aggregate 2 in a resin, and the apparent volume of the large aggregate 1 possesses almost all the volume, while the apparent volume of the small aggregate 2 fills the space among the large aggregate 1. (The hatched area in the figure represents the space filled with the small aggregate 2). The mixing ratio of the aggregate to the resin is controlled not strictly but only to keep the water permeability, and is usually about 15:1 to 7:3 weight ratio of the aggregate to the resin. The large aggregate contains grains having >=10 mm grain size by >=70%. The small aggregate contains grains having <=1.5 mm grain size by >=70 wt.%. The grain size distribution of the small aggregate shows that grains having 1.5 to 0.4 mm grain size are included by 60 to 90 wt.% and grains having <=0.4 mm grain size are included by 10 to 40 wt.%.

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.

[0002]

2. Description of the Related Art Conventionally, roads have been paved with asphalt. In this method, a mixture of asphalt and aggregate (pebble) is laid on the surface of a road. Since the asphalt component itself does not transmit water, the entire pavement surface did not transmit water, and thus either remained on the surface or flowed into the gutter. However, if rainwater accumulates on the road surface, it forms a film, which is very dangerous because it leads to an automobile slip accident. In addition, since there was no permeation of water downward and the water flowed downstream from the gutter, groundwater was reduced and land subsidence occurred. In addition, the decrease in groundwater is also affecting the surrounding plants.

Therefore, so-called drainage asphalt has been recommended so that the pavement surface has drainage property (water permeability), absorbs rainwater, and does not form a film on the surface. This is to increase the grain size of the coarse aggregate as the aggregate and narrow the range of the grain size,
As the asphalt, a high-viscosity modified asphalt excellent in durability is used. Thus, the aggregates are point-bonded to each other, a gap is provided, and water is transmitted between the gaps.

However, in this method, as shown in FIG. 3, since the aggregate 11 itself is bonded and fixed only at the point 12, the aggregate is separated on a heavy road or the like, and the aggregate is separated by a tire or the like. In many cases, and as a result, the portion often becomes a concave portion. Further, once the concave portion is formed, the scattering of the edge portion is further accelerated. For this reason, roads must be repaired frequently (about every two years or once every two years). Not only causes traffic congestion due to traffic interruption, etc., but also costs are considerable.

[0005] In order to solve such disadvantages, it is conceivable to provide a resin layer 13 by applying a resin as shown in FIG. 4 for the purpose of strengthening the surface of drainage asphalt pavement. If the resin layer 13 is made drainable, the aggregate of the asphalt portion is firmly fixed while ensuring drainage.

[0006]

However, this method of adding a resin layer has a drawback that the abrasion resistance of the resin layer is small although the separation of the aggregate is smaller than that of asphalt alone. Of course, in order to provide drainage, it cannot be applied thickly, so that the reinforcement hardening is small and clogging is often caused. In the end, drainage pavements that are strong and durable have not emerged at present, and as a result, drainage pavements have been poorly implemented despite their preference.

[0007]

Accordingly, the present inventors have greatly improved the drawbacks of the conventional resin pavement, ensured water permeability (drainage), reduced abrasion, reduced scattering of aggregate, and reduced clogging. A significantly improved pavement has been developed.

As described above, the inventor of the present invention has completed the pavement material of the present invention as a result of intensive studies, and is characterized by a pavement material obtained by mixing a large aggregate and a small aggregate in a resin. Thus, the apparent volume of the large aggregate occupies almost the whole, and the small aggregate has an apparent volume almost filling the gap between the large aggregates.

First, the pavement material of the present invention is a mixture of resin and aggregate. The mixing ratio may be such that water permeability is ensured. Usually, the ratio of aggregate: resin is 15: 1 to 7:
It is about 3. The resin is preferably an epoxy resin, but is not limited thereto, and may be a commonly used spraying material for wall surfaces or a resin used for surface treatment of roads.

The aggregate may be not only natural materials such as small stones, sand, and gravel, but also ceramics and their crushed or crushed products. The shape of the grains may be any shape.
In the case other than a sphere, the expression diameter means an approximate outer size. In particular, in the present invention, there are a large aggregate and a small aggregate, but there is also a method in which the large aggregate is made of natural stone and the small aggregate is made of a ceramic pulverized or crushed material. This is due to the ease of manufacture and collection.

The large aggregate referred to here is a relatively large aggregate such as an ordinary asphalt pavement aggregate, and has a size of 10 mm or more. However, because it is an aggregate, the size is determined by the screen (sieve),
Actually, it is difficult to manufacture (select) everything having a size of 10 mm or more. Inevitably, something smaller is mixed. In the present invention, such a thing may be used. However, at least 70 mm or more
% Is preferable. It is also preferable that the larger one having a size of 15 mm or more contains 50% or more.

The small aggregate is an aggregate capable of filling the gap between the above-mentioned large aggregates.
These are: However, as in the above, it is preferable that 70% or more containing 1.5 mm or less is actually used.

The apparent volume of a large aggregate is the volume when the voids of the large aggregate are assumed to be filled, and has the following relationship with the porosity. Porosity = (apparent volume−actual volume) / apparent volume To occupy almost the entire area means that the area to be filled with the pavement material is 1 m.
^{If 2} and the thickness is 10 cm, the total volume is 0.1 m ³ . This means that the apparent volume of the large aggregate is almost equal to this volume. Since the volume of the resin is small in volume, it hardly matters. The porosity at this time depends on the particle size distribution of the large aggregate, but is usually about 10 to 30%.

The void formed by the large aggregate is almost filled with the small aggregate. That is, the apparent volume of the small aggregate is approximately equal to the volume of the void. The voids of the small aggregate are not filled with the resin, and the aggregates are point-bonded to each other similarly to the large aggregate. In other words, the ratio between the resin and the aggregate is determined so as to achieve point bonding. The point bonding secures a gap through which water passes.

It is more preferable that the particle size distribution of the small aggregate is as follows. That is, the aggregate of 1.5-0.4mm
When 90% and 0.4mm or less of aggregates are mixed in 10 to 40%, the drainage function and clogging prevention function are well balanced, drainage is secured, and clogging is difficult. If the aggregate of 1.5 to 0.4 mm is 90% or more, the filtering effect is small. This is because the experiments conducted by the inventor have revealed that the majority of clogging substances (sand, dust, etc.) on general roads are 0.1 to 0.2 mm in size. If the aggregate of 0.4mm or less is 40% or more, drainage will decrease and it cannot be said that it is drainable pavement.

Needless to say, the resin to be used for the filler may be mixed with a resin which is usually mixed in addition to the aggregate. For example, it is a pigment or the like. Further, a surfactant may be mixed in the filler. This is because mixing a surfactant with the filler improves drainage. Further, in order to enhance the effect of preventing the asphalt aggregate from scattering, the resin may be reinforced by mixing short fibers with the resin. For example, carbon fibers having a length of about 1 mm are mixed with the resin at about 0.1 to 1.0% by weight. Of course, the fiber material may be glass, polyester, cotton thread, or any other reinforcing material.

The method of the present invention is applied to the surface of a road, and the condition of the base under the road is not limited. That is, it may be ground or asphalt pavement. For example, 30m
When constructing a paved road having a thickness of m, the lower 15 mm may be asphalt-paved and the upper 15 mm may be laid with the pavement material of the present invention. That is, the place and purpose of use of the pavement material of the present invention are free.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings. FIG. 1A shows a space S to be filled with a pavement material. Although there is no such groove in practice, it is schematically shown here for explanation. (B) shows a state in which the pavement material of the present invention is applied in this space S, but only a large aggregate 1 (resin is attached around the aggregate). That is, it can be seen that the apparent volume of the large aggregate is almost equal to the space S, and the space S is almost filled.

FIG. 2 is a sectional view of a portion coated with the pavement material of the present invention. The hatched portion is the portion where the small aggregate 2 is filled. Needless to say, the resin is present around the small aggregate 2 and is point-bonded, so that a space through which water passes remains. The situation where the large aggregate 1 fills the space S and the situation where the small aggregate 2 fills the gap of the large aggregate 1 are the same.

[0020]

According to the pavement material of the present invention, there are the following advantages. The pavement material of the present invention can be applied on conventional asphalt pavement (whether permeable or impervious), or can be applied instead of asphalt pavement or the like, since the base material is not limited. Compared with the conventional resin pavement and resin application, the point that a very large aggregate is mixed with the resin is new, thereby improving the pavement surface strength and reducing the amount of expensive resin. The coating is very simple. Compared with the conventional asphalt pavement, coloring is possible, so that an excellent appearance can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing the concept of a pavement material of the present invention.

FIG. 2 is a cross-sectional view showing a state where one example of the pavement material of the present invention is applied.

FIG. 3 is a sectional view showing a conventional example.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 Large aggregate 2 Small aggregate

Claims (3)

[Claims] 1. A pavement material in which a large aggregate and a small aggregate are mixed with a resin, wherein the apparent volume of the large aggregate occupies almost the entirety, and the small aggregate has an apparent volume substantially filling the gap between the large aggregates. Road pavement material characterized by the fact that there is. 2. The large aggregate having a particle size of 10 mm or more occupies 70% or more, and the small aggregate having a particle size of 1.5 mm or less occupies 70% or more. The pavement material of the described road. 3. The pavement material for roads according to claim 2, wherein the particle size distribution of the small aggregate is within the following range: (1) 60 to 90% by weight of the aggregate having a particle size of 1.5 to 0.4 mm. (2) 10 to 40% by weight of aggregate having a particle size of 0.4 mm or less.