EP0540940A1

EP0540940A1 - Method of paving roads

Info

Publication number: EP0540940A1
Application number: EP92117980A
Authority: EP
Inventors: Hideharu Osada
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-11-07
Filing date: 1992-10-21
Publication date: 1993-05-12
Also published as: JP3196038B2; JPH05132905A

Abstract

A method of paving roads wherein a filler (2) comprising a mixture of a specific aggregate and resin is filled in and coated on the surface of a water-permeable asphalt pavement (1) and gaps between aggregate materials (4) laid on the water-permeable asphalt surface, so that such defects of the water permeable asphalt as separation and moving away of the aggregate materials from one another due to many gaps therebetween or the like can be avoided, and the aggregate materials can be held firmly.

Description

BACKGROUND OF THE INVENTION

Field of the Invention

The invention relates to a method for paving roads.

Prior Art

Roads are conventionally paved with asphalt. In detail, mixture of asphalt and aggregate materials (ballast or gravel) is laid on the surface of roads. Asphalt itself does not allow water (such as rain water on the roads) to permeate it, so that the paved surface of roads does, as a whole, not allow water to permeate the same, causing water to stay on the road surface or flow into gutters of the roads. Rain water when stays on the road surface forms a film-like configuration, leading to a quite dangerous slip of automobiles running on the road. Also, water does not permeate the paved road, i.e., not flow downward but into the gutters downstream, leading to reduction of underground water and subsidence of ground, etc. Furthermore, reduction of underground water has a bad effect on plants growing thereabouts.
To solve the problems, it has been previously proposed to use the so-called "water-permeable asphalt" type of paving method so as to provide the paved road surface with water permeability, allowing the road surface to absorb rain water and prevent water from forming in a film-like configuration on the road surface. The water-permeable asphalt uses a reduced amount of asphalt content to cause aggregate materials to be in point-contact and adhere to one another at their specific points, so that the aggregate materials have gaps therebetween through which gaps water can flow.
According to the above water-permeable asphalt method, the aggregate materials 11 themselves are adhered and fixed to one another only at the points 12 as shown in Fig. 3. The aggregate materials 11 laid on a road, for example, for heavy vehicles or the like are likely to be separated from one another and spattered in the direction of the arrows by the vehicles tires or the like, resulting in recesses on the paved road. The aggregate materials at the edges of the recesses are more likely to be so spattered. Hence, the roads need to be repaired frequently (annually or every two years), causing traffic congestion or jam due to blocking up of the streets upon repair of roads, and necessitating a substantial high cost to repair.
To mitigate the above defects of the water-permeable asphalt method, resin (mixed with aggregate) may be coated, as shown in Fig. 4, on the aggregate materials 11 to form a resin layer 13 in order to reinforce the road surface of the water-permeable asphalt pavement. (a resin layer addition method) The resin layer 13 is adapted to be permeable to water, so that the paved road has water-permeability with the aggregate materials of the water-permeable asphalt pavement being firmly fixed to one another.
The resin layer addition method does however still have such defects as separation and crack of the resin layer and the asphalt surface, deposition of dirt therebetween, and their poor wear resistance even though the aggregate materials less separate and move away from one another than in the case of a bare water-permeable asphalt surface. Separation and the poor wear resistance of the resin layer and the asphalt layer may be improved by increasing the amount of adhesives to be used therebetween. But, this results in an unfavourable sharp decrease of the water-permeability of paved road.
As a result, there has not yet been realized such a water-permeable asphalt type of paving method that enables a firm and long-lived water-permeable asphalt pavement. Hence, the water-permeable asphalt method has not been broadly put in practical use, though regarded as having potentialities.

SUMMARY OF THE INVENTION

Under the circumstances, the inventor has achieved from his continuous study the method of paving roads according to the present invention. The road-paving method is characterized in that a filler comprising a mixture of specific aggregate and resin is filled in and coated on the surface of a water-permeable asphalt pavement and gaps between aggregate materials, such as ballast or the like, laid on the water-permeable asphalt surface.

BRIEF DESCRIPTION OF THE DRAWINGS

Figs. 1(a) and 1(b) are sectional views showing specific steps of an example of a road-paving method according to the present invention.
Figs. 2(a) to 2(c) are sectional views showing specific steps of an another example of a road-paving method according to the present invention.
Fig. 3 is a sectional view showing a conventional example.
Fig. 4 is a sectional view showing an another conventional example.

DETAILED DESCRIPTION OF THE INVENTION

Next, the present invention will be detailed correspondingly to wording of the claims.
The water-permeable asphalt may use a general water-permeable asphalt but is not to be a special one. Also, the specific aggregate may use inorganic particulate materials, such as crushed ceramic, as well as gravel, sands, ballast or the like. The size of specific aggregate is preferably 0.1 to 0.5mm in diameter. The aggregate when further decreased in size has a lower water-permeability, and cannot be filled in gaps between the aggregate materials of water-permeable asphalt pavement when the specific aggregate is larger than the above.
Resin may use an epoxy resin but should not be limited thereto. Those generally used for a wall surface spraying material and surface treatment of roads are usable.
The filler is a mixture of the above specific aggregate and the resin. Mixing ratio of aggregate and resin is not specially limited but should be determined depending on sizes of the specific aggregate and kinds of resins. In any case, the mixing ratio should be considered in that the filler can surely have the water-permeability to some extent, can be filled in gaps between aggregate materials laid on the asphalt surface and can be well workable. The resin may be mixed, for example, with pigment or the like that is customarily mixed with resin, in addition to the specific aggregate.
The specific aggregate and resin of the filler is preferably in the weight ratio of 9:1 to 7:3 when the specific aggregate uses gravel or the like which is approximately 0.3mm in diameter.
Gaps between the aggregate materials laid on the asphalt surface are those defined by numerous ballast or the like serving as the aggregate materials of the foregoing water-permeable asphalt pavement. That the filler is filled only in the gaps to allow the aggregate materials of the asphalt layer to be also exposed to the road surface is the main point and a novel feature of the present invention. The filler firmly fixes the aggregate materials of asphalt pavement and has the water-permeability by itself, so that the filler does not harm water-permeability of the asphalt pavement as a whole. Also, since there is provided no additional layer on the asphalt layer surface, the paved road has no problem of separation of such layers. A method of filling and coating the filler is not limited to particular ones. For example, the filler may be filled, by use of a trowel means, a paving finisher or the like, in the gaps between ballast or the like of the asphalt surface layer while being finished of coating as being cut by rubbing at the uppermost points of the ballast. Filling depth (thickness) may extend for one layer of aggregate materials of the asphalt as enough to prevent the aggregate materials from being spattered. The filler may be filled further deeply. Also, a coating range of the filler may be partial other than the whole asphalt surface. Furthermore, any parts of paved road except those applied with the filler according to the present invention may be coated or filled with any coating materials, such as resin having no water-permeability, or the like.
The road paving method according to the present invention is designed to be applied to the asphalt surface, so that it is easily applicable to any previously paved roads to reinforce the same.
In recent years, there are widely reported such hopes to have any relevant patterns on the road surfaces for providing a fine view in local environment. The present invention can quite easily realize the hopes in such manner that a pattern member punched for a desired pattern (stencil) is first laid on an asphalted road surface, on which the filler according to the present invention (different in color from that asphalt surface) is coated. After coating the filler, the pattern member is peeled to cause the desired pattern to be left there. In this case, any parts of the asphalt surface covered by the pattern member are not filled (coated) with the filler. Since such parts of the asphalt surface are quite small and do not have any problems substantially. The above process can easily provide pavement of roads which are superior in fine views and can prevent the aggregate materials, such as ballast or gravel, from moving away or being spattered.

EMBODIMENTS

Fig. 1(a) is a sectional view showing specific steps of the road paving method according to the present invention in use wherein a filler 2 is coated on an asphalt pavement surface 1. A trowelling means 3 (trowel or the like) is used to fill the filler 2 in gaps 5 between aggregate materials 4 and uniformly coat the filler on the surface. Fig. 1(b) shows the state that the coating of filler has ended to complete works. As seen from the drawing, the filler does not substantially project at the surface level of the asphalt.
Figs. 2(a) to 2(c) show the case using a pattern member 6. As shown in Fig. 2(a), the pattern member 6 is first stuck onto the asphalt surface, on which the filler 2 is coated as shown in Fig. 2(b). It will be appreciated from the drawings that a thinner pattern member 6 is preferable to further clearly define the desired pattern. The pattern member 6 is finally peeled to cause the filler 2 to be left only at parts of the asphalt surface corresponding to the punched parts of the applied pattern member, completing the desired pattern. A larger pattern is preferably used since the asphalt surface has gaps.

EFFECT OF THE INVENTION

The road-paving method according to the present invention provides the advantages as follows.

(1) The filler comprising a mixture of resin and the specific aggregate of finely divided particles is solidly filled in gaps between the aggregate materials, such as ballast or the like, laid on the asphalt surface to reinforce the same, so that the aggregate materials are not easily separated from one another and thereby not spattered. Hence, the surfaces of paved roads can have a long life to notably reduce frequency of repair works.
(2) Water-permeability of paved roads is not damaged, thereby enabling to prevent a dangerous slip of vehicles running on the roads, and having no problems of reduction of underground water.
(3) The paved roads have on the surface the exposed aggregate materials of asphalt layer, and the filler using the specific aggregate of finely divided particles is solidly filled in the gaps between the aggregate materials. Hence, dirt is not likely to be caught in the gaps and the roads can be cleaned easily.
(4) The road-paving method according to the present invention is simply applicable also to any roads already paved.
(5) The road-paving method provides application of any desired patterns on roads with a simple operation.

Claims

A method of paving roads wherein a filler comprising a mixture of a specific aggregate and resin is filled in and coated on the surface of a water-permeable asphalt pavement and gaps between aggregate materials laid on the water-permeable asphalt surface.
A method of paving roads as set forth in claim 1, wherein the specific aggregate is ceramic, ballast or gravel, having a diameter in the range from 0.1 to 0.5mm.
A method of paving roads as set forth in claim 1 or 2, wherein the filling and coating of the filler is carried out only at a part of the asphalt pavement surface.