JP6064426B2 - Block pavement joints and base materials - Google Patents

Description

  The present invention relates to a block pavement joint and base material used when constructing a block pavement such as a sidewalk.

In general, a block pavement such as a sidewalk has a structure in which a plurality of blocks are laid on a base material, and sand is filled as a joint material between the blocks. When such a block pavement is exposed to wind and rain, the sand at the joint portion tends to flow out from between the blocks. And when the sand of a joint part flows out between blocks, the mutual support between blocks is lost, and it has the difficulty that it becomes easy to become a road surface with intense unevenness.
Then, in order to eliminate such a difficulty, as a block pavement joint and base material used when forming a block pavement road, it is targeted for cinnabar No. 4-7, and a total weight ratio of 0.1-2 wt% Patent Document 1 discloses that asphalt is mixed in a range to form an asphalt layer around dredged sand.

Japanese Patent No. 3324089

  However, the joint and base material for block pavement described in Patent Document 1 has a problem of incurring high costs because dredged sand is used as a base material. Moreover, in order to reduce the outflow amount due to rainwater as much as possible, as shown in FIG. 8, it is effective to set the mass ratio of asphalt adhering to the surface of dredged sand to 2.5 to 3.0 mass%. However, there is a problem that the amount of asphalt added increases and the manufacturing cost increases.

FIG. 8 shows the relationship between the amount of flow of joint material and the amount of asphalt when spraying about 100 mm of water for 15 minutes to a block pavement joint material having the surface of natural sand covered with asphalt.
The present invention was made in view of such circumstances, and provides a block pavement joint / base material that can be suitably used as a joint material or a base material for a block pavement without causing an increase in manufacturing cost. It is aimed.

In order to solve the above-mentioned problem, the block paving joint / base material of the invention according to claim 1 is a block paving joint / base material comprising a base material and an asphalt layer covering the base material, The base material is made of eco slag or non-ferrous metal slag, and the asphalt layer is formed by attaching asphalt having a mass ratio of 0.5 to 1.5 mass% to the surface of the eco slag or non-ferrous metal slag. Features.
Ecoslag as used herein refers to a melted and solidified product generated from general waste or sewage sludge.

The block pavement joint / base material according to claim 2 is characterized in that the asphalt layer is formed of straight asphalt having a penetration of 60-80.
The block pavement joint / base material according to claim 3 is characterized in that the maximum particle size of the eco-slag or non-ferrous metal slag is 4.76 mm or less.

  According to the present invention, it is not necessary to use dredged sand as a joint material for a block pavement or a base material for a base material, so that an increase in manufacturing cost can be suppressed. Moreover, the outflow of the joint material can be suppressed without setting the mass ratio of the asphalt to 2.5% by mass or more, and as a result, the amount of asphalt added can be reduced, so that an increase in manufacturing cost can be suppressed.

It is sectional drawing of the joint and base material for block paving which concerns on one Embodiment of this invention. It is a figure which shows the correlation with the sediment rate and the amount of asphalt of the block pavement joint and base material shown in FIG. It is a figure which shows the plane and cross section of the pavement which simulated the block pavement. It is a figure which shows the correlation with the outflow amount and asphalt amount of the joint for block paving shown in FIG. It is a figure which shows the water permeability of the joint and base material for block paving shown in FIG. It is a figure which shows the residual rate of the block pavement joint and base material when the block pavement joint and base material shown in FIG. 1 are screened with a 9.5 mm sieve. It is a figure which shows the correlation with the sediment rate and outflow amount of a block pavement joint and base material shown in FIG. 1, and a slump value. It is a figure which shows the correlation with the outflow amount of the joint material which coat | covered the surface of dredged sand with asphalt, and the amount of asphalt.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view of a block pavement joint / base material according to an embodiment of the present invention. As shown in FIG. 1, a block pavement joint / base material 1 according to an embodiment of the present invention includes an eco slag 2 as a base material and an asphalt layer 3 covering the eco slag 2.

  Eco slag 2 as used herein refers to those produced by melting general waste or its incinerated ash after cooling, or those produced by cooling sewage sludge or its incinerated ash after melting, and its maximum particle size Is approximately 4.76 mm or less. Moreover, what is marketed can be used as the eco slag 2, for example, what satisfies the Kyoto City slag quality inspection procedure can be used.

The asphalt layer 3 is made of, for example, straight asphalt having a penetration of 60-80, and adheres to the entire surface of the eco slag 2.
Various methods can be used as a method of forming the asphalt layer 3 on the surface of the ecos slag 2. For example, a method of forming an asphalt layer on the surface of the eco slag by introducing eco slag and asphalt into a heating mixer is used. Can do. In this case, when an asphalt emulsion is used as a binder, an asphalt layer can be formed on the surface of the eco-slag without heating and melting the asphalt.
As described above, by setting the base material of the block pavement joint / base material 1 to the eco slag 2, it is not necessary to use dredged sand as the base material of the joint material or the base material, so that an increase in cost can be suppressed.

  Moreover, the surface of the cinnabar is formed by attaching asphalt having a mass ratio of 0.5 to 1.5 mass%, preferably 0.5 to 1.0 mass%, to the surface of the eco-slag 2 to form the asphalt layer 3. Like those coated with asphalt, it is possible to suppress the outflow of joint material without increasing the mass ratio of asphalt to 2.5% by mass or more, thereby reducing the amount of asphalt added, thereby suppressing an increase in manufacturing cost. Can do.

(Sediment test)
The present inventors performed the following test in order to evaluate the outflow reduction effect when the block pavement joint / base material 1 is used as a joint material. Specifically, the block pavement joint / base material 1 is put into a 30 × 10 × 6 cm box with no rolling pressure, and the amount of outflow with respect to the entire sample when flowing a certain amount of water is evaluated as the rate of sand flow. A test was conducted. The test results are shown in FIG.
As the eco-slag 2 of the block pavement joint / base material 1, one having a density of 2.837 g / cm ³ and a water absorption of 0.124% was used.
Comparing the case where the surface of Ecoslag is not coated with asphalt and the case where it is coated with asphalt, as shown in Fig. 2, when the surface of Ecoslag is coated with asphalt, the sand flow rate is greatly reduced, and it is superior as a joint material. It has been confirmed that it has sex.

In addition, in the case where the surface of ecoslag is coated with asphalt, the sediment rate tends to decrease as the mass proportion of asphalt increases, but when the mass proportion of asphalt exceeds 2.0 mass%, the sediment rate becomes almost constant. I was able to confirm. This is considered to be because the adhesiveness of the block pavement joint / base material 1 is increased and the resistance to water is improved.
From this, it is understood that when the base material made of eco slag is used as the joint material or the base material of the block pavement, it is preferable to cover the surface of the eco slag with asphalt in order to reduce the sand flow rate. Ecoslag is single grained compared to natural sand, and it is easy to secure a void after compaction, which is advantageous for water permeability.

(Outflow test)
The present inventors created a simulated paved road having a structure shown in FIG. 3 as a paved road simulating a block paved road. Then, the road surface shown in FIG. 3 has the same gradient of 1.5% as the sidewalk entry part, and a large number of alumina balls 8 are filled between the block 7 and the block 7 laid on the foundation layer 6, A block pavement joint / base material 1 shown in FIG. 1 was filled as a joint material between the block 7 and the alumina balls 8. Then, about 100 mm of water was sprinkled in 15 minutes, and the outflow amount of the joint material flowing out from the location where the gradient was attached was measured. The measurement results are shown in FIG.

In addition, as the block 7 of the pavement shown in FIG. 3, the thing of width 85mm * length 85mm * thickness 50mm was used, and the clearance gap between the blocks filled with joint material was set to 10 mm. Further, the thickness of the foundation layer 6 on which the block 7 is laid is set to 30 mm, and the thickness of the roadbed layer 5 formed under the foundation layer 6 is set to 20 mm.
Comparing the case where the surface of Ecoslag is not coated with asphalt and the case where it is coated with asphalt, as shown in Fig. 4, it is confirmed that the outflow of joint material can be greatly reduced when the surface of Ecoslag is coated with asphalt. did it.

  Further, comparing the case where the surface of the eco slag is coated with asphalt and the case where the surface of the dredged sand is coated with asphalt, the amount of joint material outflow can be significantly reduced when the surface of the eco slag is coated with asphalt. As shown in FIG. 8 and FIG. 8, even when the test condition is a severe test condition of about 100 mm in 15 minutes, the outflow amount of the joint material can be greatly reduced.

Moreover, when the mass ratio of the asphalt adhering to the eco-slag surface is compared with the case of 0.5-1.5 mass% and the case of 2.0-3.0 mass%, as shown in FIG. In the case, the outflow amount of the joint material was 90 to 60 g, and in the latter case, the outflow amount of the joint material was 50 g or less.
This shows that the outflow of the joint material can be effectively suppressed even when the mass ratio of the asphalt adhering to the eco-slag surface is 0.5 to 1.5 mass%.

(Evaluation on water permeability)
The block pavement joint / base material 1 shown in FIG. 1 was used as a joint material for the block pavement road shown in FIG. 3, and the water permeability of the block pavement joint / base material 1 was investigated. The survey results are shown in FIG.
As shown in FIG. 5, when the surface of the eco slag is not coated with asphalt and the one coated with the asphalt, it is understood that both the coefficient of water permeability and the amount of water permeated are higher when the surface of the eco slag is coated with asphalt. .

In addition, when the surface of the eco slag is coated with asphalt, the permeability coefficient and the amount of permeability tend to increase until the mass ratio of the asphalt is up to 1.5 mass%, but if the mass ratio of the asphalt exceeds 1.5 mass%, the water permeability It can be seen that the coefficient and water permeability tend to decrease. This is probably because the mass ratio of asphalt affected compaction, density, and formation of aggregate structure.
From this, it can be seen that by setting the mass ratio of asphalt adhering to the surface of the eco slag to 1.5 mass% or less, it is possible to obtain a block pavement joint and base material having excellent water permeability.

(Evaluation on workability)
In order to evaluate the workability of block pavement joints / base materials 1, about 500 g of block pavement joints / base materials 1 immediately after mixing eco-slag and asphalt are compacted with a 10 cm diameter mold (Rammer weight 4.5 kg, 1 layer 5 times), after standing to cool, the residual ratio of the block pavement joint / base material 1 when sieving with a 9.5 mm sieve was measured. The measurement results are shown in FIG.
As shown in FIG. 6, when the mass ratio of asphalt adhering to the eco-slag surface increases, the residual ratio also increases, and when the mass ratio of asphalt reaches 3.0 mass%, 80% or more of the sieves having the same diameter as the joints. Was confirmed to remain.
Moreover, when the mass ratio of asphalt is 1.5% by mass, the residual rate of the block pavement joint / base material 1 is about 50%, which can be sufficiently used as a joint material or base material for the block pavement. Recognize.

(Slump cone test)
The slump cone test of the block pavement joint / base material 1 shown in FIG. 1 (the number of times of compaction: 100 times) is performed in accordance with JIS A1101: 2005, and the sediment rate and slump value of the block pavement joint / base material 1 The correlation between runoff and slump value was investigated. The survey results are shown in FIG.
As shown in FIG. 7, the correlation coefficient between the sediment rate and the slump value is 0.8349, and the correlation coefficient between the outflow amount and the slump value is 0.9094. As a result, applicability was generally recognized.
From the above, it is not necessary to use dredged sand as the base material of joint material and base material by using the base material of joint material and base material used for block pavement as the base material of joint material and base material. it can.

Moreover, the mass ratio of asphalt is adjusted by attaching asphalt having a mass ratio of 0.5 to 1.5 mass%, preferably 0.5 to 1.0 mass% to the surface of the eco slag to coat the surface of the eco slag. Even if it is not 2.0% by mass or more, loss due to rainwater or the like can be effectively suppressed, and as a result, the amount of asphalt added can be reduced to suppress an increase in manufacturing cost.
In the embodiment of the present invention shown in FIG. 1, the block pavement joint / base material 1 is made of eco slag. However, the present invention is not limited to this. For example, the block pavement joint / The base material of the base material 1 may be made of non-ferrous metal slag.

  Moreover, in one Embodiment of this invention shown in FIG. 1, although the asphalt layer 3 illustrated what consists of straight asphalt of penetration 80-80, it is not restricted to this. For example, asphalt emulsion 3 or modified asphalt may be used as the material of asphalt layer 3, and by selecting asphalt emulsion or modified asphalt according to the on-site environmental conditions, the performance can be improved with a smaller amount of asphalt. It is possible to obtain joints and base materials.

DESCRIPTION OF SYMBOLS 1 ... Block pavement joint / base material 2 ... Eco slag 3 ... Asphalt layer 5 ... Roadbed layer 6 ... Base layer 7 ... Block 8 ... Alumina ball

Claims (3)

Block pavement joint / base material comprising a base material and an asphalt layer covering the base material,
The base material is made of eco slag or non-ferrous metal slag, and the asphalt layer is formed by attaching asphalt having a mass ratio of 0.5 to 1.5 mass% to the surface of the eco slag or non-ferrous metal slag. Characteristic block pavement joints and base materials. The joint / base material for block paving according to claim 1, wherein the asphalt layer is formed of straight asphalt having a penetration of 60-80 . The joint / base material for block pavement according to claim 1 or 2, wherein the maximum particle size of the eco-slag or non-ferrous metal slag is 4.76 mm or less .

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