JP7093742B2 - Block pavement structure and its construction method - Google Patents

Description

The present invention relates to a block pavement structure and a method for constructing the block pavement structure.

Conventionally, block pavement using natural stone blocks and the like has been adopted as sidewalk pavement or light traffic pavement, but with the spread of landscape pavement, opportunities to apply it to general roadways have increased. In the block pavement for sidewalks, the block was laid on the empty mortar, but if this structure is used on a general roadway, it will not be durable against the repeated load and impact load of the vehicle. There was a problem that the block was damaged. Especially on the road where large vehicles travel, the blocks were damaged early.

Therefore, the present inventors have developed and popularized a block pavement that can run even on a large vehicle (see Patent Document 1). In this block pavement, crushed stone is laid on a base such as asphalt pavement to form a support layer, and multiple blocks are laid on it with joints open, and cement asphalt mortar (hereinafter referred to as cement asphalt mortar) is laid from the joint space. It is constructed by filling the gaps between crushed stones and the joint space of the support layer (referred to as "CA mortar"). CA mortar contains special cement and special asphalt emulsion, and has adhesiveness and viscoelasticity. As a result, the block pavement can prevent the block from being damaged because the block is integrated with the base for a long period of time by restraining the bottom surface and the four side surfaces of the block.

Japanese Patent No. 2909929

By the way, the color tone of the joint portion in the conventional block pavement structure (see Patent Document 1) is limited to a dark color system based on black color derived from CA mortar (asphalt) filled in the joint space portion. On the other hand, in the conventional block pavement structure, the selection range of the color tone of the joint can be expanded by filling the cement-based decorative joint so as to cover the CA mortar at the upper part of the joint space. However, when this structure is used on a general roadway, there is a problem that the decorative joint is damaged over time.

An object of the present invention is a block pavement structure capable of suppressing damage to the block pavement for a long period of time and expanding the selection range of the color tone of the joint portion while maintaining good durability of the joint portion. It is to provide a construction method.

The block pavement structure of the present invention that solves the above problems is formed of a base, an aggregate laid on the base, a support layer having a gap between the aggregates, and a joint on the support layer. It has a plurality of blocks laid with a space, and an asphalt-free composition filled in the gap between the aggregates and the joint space, and the asphalt-free composition is cement. The asphalt-free composition contains the resin solid content and the filler, and the content of the resin solid content in the asphalt-free composition is 5 to 20% by mass .

Further, in the method for constructing the block pavement structure of the present invention, which solves the above-mentioned problems, an aggregate is spread on the base, a step of forming a support layer having a gap between the aggregates, and a step of forming the support layer on the support layer. A block laying step of laying a plurality of blocks with a joint space open, and a filling step of filling the gap between the aggregates and the joint space with a filler forming an asphalt-free composition. The asphalt-free composition contains cement, a resin solid content, and a filler, and the content of the resin solid content in the asphalt-free composition is 5 to 20% by mass. It is characterized by.

According to the present invention, a block pavement structure capable of suppressing damage to the block pavement for a long period of time and expanding the selection range of the color tone of the joint portion while maintaining good durability of the joint portion and the block pavement structure thereof. A construction method can be provided.

It is sectional drawing which showed the block pavement structure which concerns on embodiment of this invention. (A) to (c) are construction process diagrams of the block pavement structure which concerns on embodiment of this invention. It is explanatory drawing of the measurement method which evaluates the adhesion strength of a block with respect to the support layer in the block pavement structure produced in the Example of this invention.

The block pavement structure and the method for constructing the block pavement structure according to the embodiment of the present invention, and the block pavement filler will be described in detail with reference to the drawings as appropriate.

<Block pavement structure>
As shown in FIG. 1, the block pavement structure 1 includes a support layer 10 provided on the base 2 and a block 20 arranged on the support layer 10.
The base 2 is made of, for example, asphalt pavement or concrete pavement slab, and is formed smoothly. Further, the base 2 may be a soil-based pavement, a bridge surface pavement, a concrete deck slab, a steel deck slab, or the like in a sidewalk, a park, a plaza, or the like, as long as it is an impermeable layer.

The support layer 10 is an asphalt-free composition 21 filled in the aggregate 11 laid on the substrate 2 and the void 23 (see FIG. 2B) described later formed between the aggregates 11. And is configured with. The asphalt-free composition 21 is formed after the block pavement filler 12 (see FIG. 2B), which will be described in detail later, is filled in the void 23 (see FIG. 2B) and cured.
The asphalt-free composition 21 will be described in detail later.

The aggregate 11 is assumed to be, for example, crushed stone, crushed jade, gravel, steel slag, etc., but is not limited thereto. Further, as the aggregate 11, asphalt-coated aggregate in which the above-mentioned crushed stone is coated with asphalt, recycled aggregate, artificially fired aggregate, fired foamed aggregate, artificial lightweight aggregate, ceramic grains, emery and the like are also used. Can be done. The aggregate 11 may have a continuous particle size or a single particle size. Generally, No. 6 crushed stone with a particle size range of 5 to 13 mm

Or smashing is used.

The block 20 in this embodiment is assumed to be a natural stone or a concrete block.
Examples of natural stones include, but are not limited to, marble, granite, andesite.
Examples of the shape of the block 20 include, but are not limited to, a rectangular flat plate shape, a cubic split stone, and an irregular stone plate.

<Asphalt-free composition>
The asphalt-free composition 21 in the present embodiment specifically assumes a special asphalt emulsion-free composition that does not contain a mixture of an asphalt emulsion and a resin emulsion (special asphalt emulsion).
The asphalt-free composition 21 is composed of cement, a resin solid content, and a filler.

(cement)
Examples of the cement in the present embodiment include ultrafast hard cement, ordinary Portland cement, early-strength Portland cement, ultra-fast-strength Portland cement, moderate heat Portland cement, low heat Portland cement, sulfate-resistant Portland cement, and blast furnace cement (JIS R). 5211: 2009), fly ash cement (JIS R 5213: 2009), eco-cement (JIS R 5214: 2009), alumina cement (JIS R 2521: 1995) and the like can be mentioned.

Examples of ultrafast-hardening cement include jet cement (Sumitomo Osaka Cement Co., Ltd .: Jet (registered trademark)), Super Jet Cement (Pacific Cement Co., Ltd .: Jet (registered trademark)), and Super Cement (Denka Co., Ltd.). Can be mentioned.
The content of cement in the asphalt-free composition 21 is preferably 30% by mass or more, more preferably 30 to 50% by mass.

(Resin solid content)
The resin solid content in the present embodiment is specifically assumed to be a cement-mixed resin (powder resin), and an emulsion-based resin is particularly preferable.
Examples of the resin solid content include, but are not limited to, synthetic rubber type such as styrene-butadiene rubber; natural rubber type; ethylene vinyl acetate type; acrylic acid ester type.

Further, as the resin solid content, the re-emulsified powder resin specified in JIS A 6203: 2015 can be used.
Such a re-emulsified powder resin may be, for example, vinyl acetate / beova type, vinyl acetate / ethylene type, vinyl acetate / acrylic type, styrene / acrylic type, acrylic type, vinyl acetate copolymer system, etc., depending on the composition of the resin. Re-emulsified powder resin, but is not limited to this.
The content of the resin solid content in the asphalt-free composition 21 is preferably 5 to 20% by mass.

(Filler)
Examples of the filler in the present embodiment include calcium carbonate, silica sand, stone powder, river sand, sea sand, mountain sand, crushed sand, blast furnace slag powder, fly ash, powdered artificial fine aggregate, slag fine aggregate, and recycled fine. Aggregate and the like can be mentioned.
The content of the filler in the asphalt-free composition 21 is preferably 35 to 65% by mass.

<How to build a block pavement structure>
Next, a method of constructing the block pavement structure 1 of the present embodiment will be described.
The construction method in the present embodiment includes a step of forming the support layer 10 (see FIG. 1) on the base 2 (see FIG. 1), a step of laying the block 20 (see FIG. 1) on the support layer 10. It has a step of filling a block paving filler for a joint space formed between the support layer 10 and the blocks 20.
In addition, this filling material for block pavement corresponds to the "filling material" in the claims.

2 (a) to 2 (c) are construction process diagrams of the block pavement structure 1 according to the embodiment of the present invention.
First, in this construction method, as shown in FIG. 2A, a step of forming the support layer 10 (see FIG. 1) on the substrate 2 and a block 20 (see FIG. 1) on the support layer 10 The laying process is performed in this order.

In the step of forming the support layer 10 (see FIG. 1), the aggregate 11 is laid on the base 2.
As a result, a support layer 10 having a gap 23 between the aggregates 11 is formed on the base 2.
Next, in the laying step of the block 20 (see FIG. 1), a plurality of blocks 20 are laid with a joint space 24 opened on the support layer 10.
As a result, the joint space 24 communicates with the void 23 formed in the support layer 10.

As shown in FIG. 2B, in this construction method, the voids 23 and the joint spaces 24 formed in the support layer 10 are filled with the slurry-like block paving filler 12 which will be described in detail later (filling). Process).
In the filling step in the present embodiment, it is assumed that the funnel F arranged above the joint space 24 is used to fill the gap 23 and the joint space 24 with the block pavement filler 12.

However, this filling step is not limited to filling the voids 23 of the support layer 10 with the block paving filler 12 via the joint space 24.
Therefore, in this filling step, for example, in the laying step of the block 20 (see FIG. 1), the block 20 is partially left unarranged, or the block 20 is partially removed to expose the support layer 10. It is also possible to directly fill the block paving filler 12 with the block paving filler 12. At this time, the funnel F does not have to be used.
Then, the joint space 24 formed between the blocks 20 around the exposed support layer 10 is filled with the block paving filler 12 from below via the support layer 10.

Then, in this construction method, as shown in FIG. 2 (c), the block pavement filler 12 has a gap 23 formed in the support layer 10 and an upper portion of the joint space 24 (see FIG. 2 (b)). It is filled up to the opening (upper end). After that, curing and curing are performed to complete a series of steps of this construction method.

<Filler for block pavement>
Next, the block paving filler 12 (see FIG. 2B) will be described.
The block pavement filler 12 (filler) in the present embodiment contains the cement, the resin solid content, and the filler. Further, the block paving filler 12 further contains an amphoteric metal powder, an admixture, and water in addition to these.

Examples of the amphoteric metal powder include aluminum powder, zinc powder, tin powder and the like. Of these, aluminum powder is preferable.
Further, the aluminum powder preferably has a relatively sharp atomized aluminum powder having an average particle size (laser diffraction / scattering method) of about 25 to 45 μm and a particle size distribution of 70 to 90% through a 45 μm sieve. .. Further, it is more preferable that the aluminum powder has a 45 μm sieve passage amount of 80% by weight or more and a specific surface area of the 45 μm sieve passage amount of 4 m ² / g or more and 10 m ² / g or less.

Examples of the admixture in the present embodiment include a water reducing agent, a coagulation adjusting agent, a thickening agent, and an antifoaming agent.
The water is not particularly limited, and examples thereof include tap water, industrial water, groundwater, and river water.
Further, a dye or pigment for coloring the asphalt-free composition 21 (see FIG. 1) can be added to the block pavement filler as needed.

The ratio of each component in the block paving filler 12 (see FIG. 2B) is 10.0 to 44.0 parts by mass of the resin solid content and 79.0 to 7 parts by mass of the filler with respect to 100 parts by mass of the cement. It is preferably composed of 219 parts by mass, 0.008 to 0.045 parts by mass of the amphoteric metal powder, 2.21 to 3.42 parts by mass of the admixture, and 100 to 170 parts by mass of water.

The block pavement filler 12 of the present embodiment can be prepared by mixing a predetermined amount of each of the above components with a kneading tool.
The kneading device is not particularly limited, and examples thereof include a hobert mixer, a hand mixer, a tilting mixer, and a twin-screw mixer.

The block paving filler 12 preferably has a unit volume mass of about 1.61 to 1.80 kg / L.
Further, the block pavement filler 12 has a flow value (flow time) of about 9.1 to 15.6 seconds based on the "C041 semi-flexible cement milk fluidity test method (P funnel method)". Is preferable.
Further, the block paving filler 12 preferably has an expansion amount of about +0.02 to + 10.3% due to foaming of the amphoteric metal powder.

Then, when such a block paving filler 12 is filled in the gap 23 and the joint space 24 (see FIG. 2B) of the support layer 10 (see FIG. 1), it is used for block paving over time. The water in the filler 12 disappears, the residual amount of the amphoteric metal powder and the admixture becomes extremely small, and the asphalt-free composition 21 is formed.
The asphalt-free composition 21 has a compressive strength of, for example, 3.0 N / mm ² or more at 7 days of age. Further, the asphalt-free composition 21 can have an adhesion strength of the block 20 to the support layer 10 of 0.5 N / mm ² or more.

<Action effect>
Next, the action and effect of the block pavement structure 1 of the present embodiment and the method of constructing the block pavement structure 1 will be described.
According to the present embodiment, since the joint space 24 is filled with the asphalt-free composition 21, the joint portion is CA mortar (asphalt) unlike the conventional block pavement structure (see, for example, Patent Document 1). It is not limited to the dark color system based on the black color of the origin.
Therefore, according to the present embodiment, it is possible to widen the selection range of the color tone of the joint portion.

Further, in the present embodiment, the asphalt-free composition 21 filled in the voids 23 of the support layer 10 and the joint space 24 is composed of cement, a resin solid content, and a filler.
Therefore, in the present embodiment, the strength at the joint portion of the support layer 10 and the block 20 can be increased.

Then, according to the present embodiment, since the block 20 is integrated with the base 2 for a long period of time by such an asphalt-free composition 21, the block pavement (block pavement structure 1) is damaged for a long period of time. Can be prevented.

Further, according to the present embodiment, since the asphalt-free composition 21 can be filled up to the upper opening (upper end) of the joint space 24, the conventional block pavement in which the CA mortar is filled while leaving the filling space of the decorative joint. Unlike the structure (see, for example, Patent Document 1), the filling process is simplified.

Further, in the present embodiment, the content of the resin solid content in the asphalt-free composition 21 is 5 to 20% by mass.
According to such an embodiment, the compressive strength of the asphalt-free composition 21 can be further increased. Further, according to the present embodiment as described above, the adhesion strength of the block 20 to the support layer 10 by the asphalt-free composition 21 is enhanced, and the deflection followability of the block pavement structure 1 is further improved.
Although the embodiment for carrying out the present invention has been described above, the present invention is not limited to the above-described embodiment, and the design can be appropriately changed without departing from the spirit of the present invention.

Next, the block pavement structure of the present invention will be described more specifically while showing examples.
(Examples 1 to 19)
In Examples 1 to 19, block paving fillers (fillers) having the compositions shown in Table 1 were prepared.

As the cement, ultrafast-hardening cement manufactured by Taiheiyo Cement Co., Ltd. was used.
As the aluminum powder (aluminum powder), aluminum powder manufactured by Daiwa Metal Powder Industry Co., Ltd. was used.
As the resin powder, a re-emulsified powder resin manufactured by Japan Coating Resin Co., Ltd. was used.
As the emulsion resin, an emulsion resin manufactured by Asahi Kasei Corporation was used. In Table 1, the solid content of this emulsion resin is shown as the solid content of the emulsion resin.
As the admixture, a water reducing agent manufactured by Kao Corporation was used.
As the filler, No. 7 silica sand manufactured by Nitchitsu Co., Ltd. was used.
The water used was tap water.

Then, these materials were kneaded with a hand mixer to obtain a slurry-like filler for block pavement.
Next, for each block paving filler, the unit volume mass (kg / L), the P funnel flow time (seconds), and the expansion amount (%) were measured.
The results of these measurements are shown in Table 1.
The P funnel flow time (seconds) is a flow value (flow time) based on the "C041 Semi-flexible pavement cement milk fluidity test method (P funnel method)".

Next, a specimen having a block pavement structure was prepared using the block pavement filler prepared in Examples 1 to 19.
The specimen forms a support layer by laying crushed stone (aggregate) on the bottom of a rectangular bat with a shallow bottom, and blocks from around the block made of rectangular natural stone plates placed on this support layer into the rectangular bat. It was made by pouring a filler for pavement. The natural stone plate used was made of granite (granite).

Table 2 shows the composition (unit: mass%) of the asphalt-free composition formed in the specimen by the block paving filler prepared in Examples 1 to 10.
Table 3 shows the composition (unit: mass%) of the asphalt-free composition formed in the specimen by the block paving filler prepared in Examples 11 to 19.

Then, in the process of hardening the poured block paving filler, the bending strength (N / mm ² ) of the block paving filler after 3 hours and the asphalt-free composition after 7 days were obtained. The bending strength (N / mm ² ) of the object was measured.
Further, the compressive strength (N / mm ² ) of the block paving filler after 3 hours and the compressive strength (N / mm ² ) of the asphalt-free composition after 7 days were measured.
The measurement results of these bending strengths (N / mm ² ) and compressive strengths (N / mm ² ) are shown in Table 2 for Examples 1 to 10 and Table 3 for Examples 11 to 19. I wrote it down.

In addition, the adhesion strength of the block to the support layer in the block pavement structure (material age 7 days) produced by the block pavement filler prepared in Examples 1 to 19 was measured.
FIG. 3 is an explanatory diagram of a measurement method for evaluating the adhesion strength of a block to a support layer in the block pavement structure produced in Examples 1 to 19.
As shown in FIG. 3, in this measuring method, the specimens taken out from the rectangular bat were arranged so as to be upside down. That is, the block 20 made of a natural stone plate is arranged on the lower side, and the asphalt-free composition 21 integrated with the crushed stone (aggregate) is arranged on the upper side.

Next, a 4 cm × 4 cm square notch 31 was formed in the asphalt-free composition 21 in a plan view. The attachment 32 was adhered to the rectangular portion surrounded by the notch 31 with the epoxy resin 33.
Then, by pulling the attachment 32 with a testing machine, the adhesion strength (N / mm ² ) of the block to the support layer was measured. As the testing machine, TechnoStar R-30000ND manufactured by Sanko Techno Co., Ltd. was used. The adhesive strength (N / mm ² ) was measured by measuring the adhesive strength on the upper surface, which is the expansion side of the support layer, and the adhesive strength on the lower surface, which is the normal adhesion in the support layer.

The measurement results of these adhesion strengths (N / mm ² ) are shown in Table 2 for Examples 1 to 10 and in Table 3 for Examples 11 to 19.
In addition, the state of the fracture surface was visually observed. Then, those fractured at the interface between the block and the support layer are described as "interface fracture" in Tables 2 and 3, and those fractured in the support layer are described as "material fracture" in Tables 2 and 3. ..

(Evaluation results)
As shown in the shaded areas in Tables 2 and 3, the cement content is 30 to 50% by mass, the resin solid content is 5 to 20% by mass, and the filler content is 35 to 50% by mass. It was verified that the asphalt-free composition of 65% by mass was excellent in all of bending strength, compression strength, and adhesion strength.

1 block pavement structure 2 base 10 support layer 11 aggregate 12 block pavement filler 20 block 21 asphalt-free composition 23 void 24 joint space

Claims (3)

The foundation and
A support layer formed of aggregates laid on the substrate and having voids between the aggregates, and a support layer.
A plurality of blocks laid with a joint space on the support layer, and
It has the asphalt-free composition filled in the gap between the aggregates and the joint space.
The asphalt-free composition contains cement, a resin solid content, and a filler .
A block pavement structure characterized in that the content of the resin solid content in the asphalt-free composition is 5 to 20% by mass . The step of forming a support layer having a gap between the aggregates by laying the aggregate on the base, the step of laying the block in which a plurality of blocks are laid with a joint space on the support layer, and the above-mentioned It has a filling step of filling the gap between the aggregates and the joint space with a filler for forming an asphalt-free composition.
The asphalt-free composition contains cement, a resin solid content, and a filler .
A method for constructing a block pavement structure, wherein the content of the resin solid content in the asphalt-free composition is 5 to 20% by mass . The method for constructing a block pavement structure according to claim 2, wherein in the filling step, the filler is filled up to the upper end of the joint space.

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