JPH0223603Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pavement body whose surface layer is a prefabricated paving material that has excellent stability against traffic loads, wear resistance, durability, etc., and is suitable for new pavement construction, maintenance and repair of existing pavement, etc.

Asphalt pavement has good workability, can be opened to traffic immediately after construction, and is a durable pavement. However, since the binding material is thermoplastic asphalt, it is difficult to carry large vehicles etc. during the summer when the temperature continues to be high. When there is a lot of heavy-load traffic, the road surface tends to deform, and as time passes, phenomena such as vertical unevenness (flatness), cross-sectional unevenness (rutting), or flow become observed, and the road surface becomes deformed. It is subject to maintenance and repair along with cracks. In addition, in winter, in snowy and cold regions, there is a drawback in that tire chains and spiked tires cause a great deal of wear and tear. Concrete pavement, on the other hand, has the advantage of being highly stable against loads and resistant to abrasion, but it has the disadvantage of being difficult to construct and can only be opened to traffic after it has been cured for several days after construction. The disadvantage is that it is not suitable for paving or maintenance and repair.

This invention uses prefabricated paving materials for the surface layer and is suitable for both new pavement construction and maintenance and repair of existing pavements, and is stable against traffic loads and has excellent flow resistance.
Furthermore, the present invention provides a pavement with excellent wear resistance.

That is, in the present invention, a bituminous mixture layer having a coarse-grained, open-grained, or porous aggregate grain size such as macadam is spread on the base, or a granular aggregate such as crushed stone is spread on the base. A layer that has a granular aggregate layer as its base, and the voids in the base are filled with cement-bituminous mortar containing cement, fine aggregate, and bituminous emulsion as its main ingredients, or cement-bituminous paste containing cement and bituminous emulsion as its main ingredients. The gist of this invention is a pavement body having a prefabricated paving material as a surface layer, which is characterized in that a surface layer made of prefabricated paving materials such as concrete slabs and concrete blocks is provided and integrated through a surface layer.

The base as used in the present invention means the base for constructing the pavement body of the present invention. In the case of new pavement, it may be a roadbed or a subgrade. When the pavement body of the present invention is installed on the existing pavement surface in the case of maintenance and repair of existing pavement, the existing pavement becomes the base. In addition, the surface layer,
Alternatively, if the surface base layer etc. is cut and removed before construction, the area below the cut surface will become the base. That is, the roadbed may be the base material, or it may be the subgrade for replacement. Also, for bridge surfaces, it may be floor slabs.

The structure of the pavement body of the present invention will be explained using diagrams.

FIG. 1 shows a cross-sectional view of the pavement body of the present invention. In the figure, 1 is the base. 2 is a bituminous mixture layer (hereinafter simply referred to as a bituminous mixture layer) in which a bituminous mixture having a coarse grain size, open grain size, or aggregate grain size with many voids such as macadam is laid down, or a granular aggregate such as crushed stone is laid down. This is a substrate made of a granular aggregate layer (hereinafter simply referred to as a granular aggregate layer).

The bituminous mixture layer or granular aggregate layer of the substrate 2 provided on the substrate 1 is as follows. The bituminous mixture of the bituminous mixture layer is a heated bituminous mixture or a cold bituminous mixture of coarse-grained, open-grained, porous aggregate granularity such as macadam. Examples of heated bituminous mixtures include coarse-grained asphalt concrete, open-grained asphalt concrete, and macadam heated asphalt mixtures. Furthermore, there are those using other bituminous materials, modified asphalt, tar, modified tar, etc. as binding materials. Binding agents for cold bituminous mixtures include asphalt emulsion, cutback asphalt, tar, and the like. These bituminous mixtures are spread on a substrate to a predetermined thickness, and then compacted and shaped by rolling with rollers. The production, spreading, rolling compaction, etc. of these bituminous mixtures are carried out by conventionally known methods.

The granular aggregate layer is made by laying aggregates such as crushed stone, cut crushed stone, gravel, crushed stone, slag, sand, etc. singly or in an appropriate combination to a predetermined thickness and compacted by rolling.
Stone powder or the like may be appropriately added to these. Also used is granular aggregate, which is obtained by crushing materials constituting the surface layer, base layer, or roadbed, which are waste materials when regenerating existing pavement. In general, materials with a practical modified CBR are used as roadbed materials.
However, the surface of the granular aggregate layer may be adjusted with sand, screening, etc. to shape the surface. Conventionally known methods are used for spreading the granular aggregate and compacting it by rolling.

3 is a cement bituminous mortar (hereinafter referred to as "CA mortar") whose main ingredients are cement, fine aggregate, and bituminous emulsion or a cement bituminous paste (hereinafter referred to as "CA paste") whose main ingredients are cement and bituminous emulsion. , the voids, the surface, the periphery, etc. of the base body 2 made of a bituminous mixture layer or a granular aggregate layer are filled. CA mortar or CA paste 3 is as follows.

The cement used for CA mortar and CA paste 3 is generally Portland cement. Further, admixtures used in conjunction with cement, such as cement shrinkage compensators, hardening accelerators, hardening retardants, AE agents, dispersants, water reducing agents, antifoaming agents, etc., can also be used in combination as necessary.

As the fine aggregate, in addition to sand, screenings, etc., iron sand, silica sand, etc. are used. In addition, filler can also be used together with cement, fine aggregate, etc. As fillers, in addition to stone powders, lime, gypsum, pigments, carbon, graphite, mica powder, asbestos, glass fibers, synthetic fibers, carbon fibers, etc. can also be added.

As the bituminous emulsion, an asphalt emulsion is generally used, but a tar emulsion can also be used. Asphalt emulsions include, for example, products that fall under JIS K2208 petroleum asphalt emulsions, as well as bituminous asphalt emulsions that are modified by adding rubber, elastomers, etc. to asphalt. In addition, there are also those modified by adding and mixing latexes such as rubber and synthetic polymers to these bituminous emulsions. All of these can be used as the bituminous emulsion of the present invention. These bituminous emulsions include emulsifiers of anionic type, nonionic type, clay type, etc., and any of them can be used.

The mixing ratio of cement bituminous mortar (CA mortar) and cement bituminous paste (CA paste) is
Bituminous emulsion (converted to 60% by weight of evaporation residue or non-volatile content) 0.5 to 6 parts by weight of cement
parts by weight, fine aggregate (as sand) is within the range of 0 to 6 parts by weight. Mix these proportions using a mortar mixer, concrete mixer, or other suitable mixer to make CA mortar or CA paste. Add water considering workability. Make the mixture fluid at room temperature or by applying light vibration. This mixture is hardened by the hydration reaction of the cement, but also by the development of bonding strength by the reduction of decomposed bituminous matter in the bituminous emulsion.

4 is a prefabricated paving material such as a concrete slab or concrete block (hereinafter simply referred to as prefabricated paving material), in which CA mortar or CA paste 3 is applied to the voids, surface, etc. of the base 2 consisting of a bituminous mixture layer or granular aggregate layer. Base 1 through the filled layer
is combined with

The prefabricated paving material 4 has sufficient stability and abrasion resistance as a surface layer of pavement, and is previously formed into a plate shape, block shape, or the like. These include:
For example: concrete version,
These include concrete blocks, paving stones, stone blocks, ceramic blocks such as bricks, wood bricks, asphalt blocks, and concrete blocks modified with synthetic resins such as polyester and methacrylate. In addition, molded molded bituminous mixtures using asphalt modified with epoxy resin or polyurethane resin as a binder are also used. For example, a mixture equivalent to dense-grained asphalt concrete using heated epoxy asphalt as a binder is
Compacted concrete that has gone through the curing reaction of epoxy resin has a mechanical stability that is 4 to 5 times or more than normal dense-grained asphalt concrete, and excellent abrasion resistance, and has the same or higher flexibility. be. Asphalt concrete reinforced with long glass fibers, carbon fibers, etc., goose asphalt, etc. can also be used. Since the products are pre-formed in a factory, there are no restrictions on workability as with heated bituminous mixtures on-site.
It can be modified with synthetic polymers, fibers, etc., and pressure molding can also be applied.
High stability and wear resistance incomparable to normal asphalt concrete or goose asphalt,
Prefabricated paving materials with excellent durability can be obtained. Further, it is also possible to obtain a prefabricated paving material made by combining various reinforcing materials such as iron plates, reinforcing bars, steel, and other synthetic fiber meshes. Such prefabricated pavers can also be colored if desired.

The pavement of the present invention is constructed, for example, as follows. After paving the base 2 made of a bituminous mixture layer or granular aggregate layer with a predetermined thickness on the base 1 by a conventional method, CA mortar or CA is poured into the voids of the base 2 made of the bituminous mixture layer or granular aggregate layer. Inject paste 3 and fill. Then, prefabricated paving material 4 is laid on top of it. Prefabricated paving materials 4 are usually arranged side by side without removing joints. And CA mortar or CA paste 3
harden. When creating joints in the prefabricated paving material 4, the joints should also be sealed with CA mortar or CA paste 3. Also, other sealing materials can be used.

The bituminous mixture layer or granular aggregate layer of the substrate 2 is
Since it has been rolled and has a pressure resistance by itself, it can be used for traffic as soon as the CA mortar or CA paste 3 in the gap hardens. Hardening of CA mortar or CA paste 3 is difficult when the water phase of the bituminous emulsion contains salts (e.g. calcium chloride) as a stabilizer for the bituminous emulsion itself. It can speed up the curing reaction.
In addition, after applying CA mortar or CA paste, the bituminous emulsion forms a bituminous film on the construction surface at an early stage.
Since it is possible to prevent the moisture in the paste from evaporating and to exert a curing effect, it can be opened to traffic after a very short curing period after construction. In the voids of the base body 2 consisting of a bituminous mixture layer or a granular aggregate layer
When CA mortar or CA paste 3 is filled and hardened, these layers are dense, watertight,
It is highly waterproof, and has significantly improved strength and stability compared to a bituminous mixture layer or granular aggregate layer.
Furthermore, it becomes resistant to temperature changes, does not soften even in the summer season when high temperatures continue, and the stability against loads does not deteriorate, so it does not flow. Also CA mortar or CA paste 3
Since the cured product itself has a flexibility similar to that of asphalt concrete, a bituminous mixture layer or granular aggregate layer reinforced with CA mortar or CA paste also has a flexibility similar to that of asphalt concrete. are doing.

Since it is well bonded to the prefabricated paving material 4 above it, it becomes an integrated structure. The prefabricated paving material 4 has high stability sufficient as a surface material for pavement.
Since it has wear resistance and durability, the pavement of the present invention is stable against traffic loads, has excellent flow resistance, and has excellent wear resistance and durability.

The pavement of the present invention has good workability and can be opened to traffic quickly after construction, so it can be applied not only to new construction but also to temporary pavements such as maintenance and repair. Furthermore, it has excellent practical benefits such as superior oil resistance compared to ordinary asphalt pavement.

Since the pavement body of the present invention has such practical benefits,
Although it can be applied to many types of pavement, it is particularly effective for bus stops, parking lots, toll road gate areas, airport runways, aprons, and road bridge surfaces.
Furthermore, if colored prefabricated paving materials are used, they can be used for paving shopping streets, sidewalks, etc.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of the pavement body of the present invention. In the figure, 1... base, 2... base made of bituminous mixture layer or granular aggregate, 3... CA
Mortar or CA paste, and 4... prefabricated paving material.

Claims (1)

[Scope of utility model registration request] A bituminous mixture layer with a bituminous mixture having an aggregate grain size with many voids such as coarse grain, open grain, or macadam is spread on the base, or a granular aggregate layer is spread with granular aggregate such as crushed stone. A concrete slab is formed by filling the voids in the base with a layer of cement bituminous mortar containing cement, fine aggregate, and bituminous emulsion as the main ingredients, or cement bituminous paste containing cement and bituminous emulsion as the main ingredients. A pavement body having a prefabricated paving material as a surface layer, characterized in that a surface layer made of prefabricated paving materials such as concrete blocks is provided and integrated.