JP4030574B1 - Earth-based paving material - Google Patents

Abstract

[PROBLEMS] A soil system that has high strength, high permeability and durability, does not impair the natural landscape, does not hinder the growth of surrounding trees, suppresses the growth of weeds, can reuse pottery shells, and can reduce costs. A pavement material and a construction method thereof are provided.
[Solution] Earth sand pavement is prepared by mixing pure sand soil 11 (53.4% by weight), recycled aggregate 12 (37.0% by weight) of pottery shells, and solidified material 13 (9.6% by weight). Since the material 10 is obtained, it has high strength, permeability and durability, does not impair the natural landscape, it is difficult to inhibit the growth of the roots of the surrounding trees, it is possible to suppress the growth of weeds, Available. Costs can be reduced by using ceramic shells.
[Selection] Figure 1

Description

The present invention relates to a soil-based pavement material , and more particularly, to a soil-based pavement material that has a high-strength, high permeability, and can suppress weed propagation by paving a soil-based pavement material on the surface of the soil pavement .

  The roadway and sidewalk are paved with asphalt, but the roadside is not paved. For this reason, weeds are easy to breed on the shoulder, and for example, in the summer, weeding work is added to one of the road maintenance work. However, since obstacles such as guard rails and utility poles are installed on the road shoulder, a slope is often formed on the side edge of the road shoulder. Therefore, a great deal of human power is required for the weeding work.

Therefore, as a conventional technique for solving such a problem, for example, an invention described in Patent Document 1 is known. This removes a part of the pure sand soil on the shoulder of the road, and on the remaining soil, a mixed soil composed of a mixed soil of solid sand and granulated material that has been weathered with granite and the like is disposed. The mixed soil solidified layer is paved by rolling, curing and solidifying this.
As a result, the construction period can be shortened, and the construction can be performed using the removed pure sand soil while leaving the pure sand soil on the road shoulder, and the same strength as the concrete pouring finish can be obtained.
Japanese Patent No. 3207128

  However, according to the invention described in Patent Document 1, sufficient strength as pavement cannot be obtained for a long time on the road shoulder.

Therefore, as a result of earnest research, the inventor added a ceramic shell, which is a kind of industrial waste and is a crushed piece of earthenware, to the conventional mixed soil of pure sand and solidified material. In addition to being able to ensure high permeability and durability, the natural landscape is not impaired, it is difficult to inhibit the growth of the surrounding tree roots, weed growth can be suppressed, and the pottery shell can be reused. As a result, the present invention was completed.
That is, this invention is a kind of industrial waste that has high strength, high permeability and durability, does not impair the natural landscape, is difficult to inhibit the growth of the roots of surrounding trees, can suppress the growth of weeds, and is an industrial waste. The purpose of the present invention is to provide a soil-based pavement material that can reuse a certain ceramic shell and reduce the cost, and a construction method thereof.

The invention according to claim 1 includes 53.4 to 75.8% by weight of pure sand earth, 13.9 to 37.0% by weight of recycled aggregate made of ceramic shells obtained by crushing ceramics, and 9.6 to The size of the recycled aggregate is 10.3% by weight, and the size of the recycled aggregate is a soil-based paving material having a sieve passing size of 20 mm or less .

  According to invention of Claim 1, 53.4-75.8 weight% of pure sandy soil, 13.9-37.0 weight% of recycle aggregates which consist of the ceramic shell which crushed the pottery, and solidification material 9. Since the earth-based pavement material was produced by mixing 6 to 10.3% by weight, the strength and durability of the earth-based pavement material after construction is increased, and drainage (permeability) is also increased. Moreover, since it is a pavement made mainly of soil (masa sand), the natural landscape is not impaired, it is difficult to inhibit the growth of the surrounding tree roots, and the propagation of weeds can be suppressed. In addition, the pottery shell, which is a kind of industrial waste, can be reused, thereby reducing the cost of raw materials.

The earth-based pavement material is a pavement material whose main material is soil.
The earth-based pavement material here may be a material to which colored powder or the like is added in addition to recycled sand and solidified material made of pure sand, ceramic shells.
Pavement refers to paving material on the ground to increase the durability of the ground.
The ground means a surface such as a road (including a roadway and a sidewalk). In addition, the surface of the ground.
The strength of the earth-based pavement is 3 N / mm ² or more. If it is less than 3 N / mm ² , problems such as peeling damage and weed emergence occur. If the strength of the earth-based pavement is 6.0 N / mm ² or more, it has durability over a long period of time. The increase in the strength of the earth-based pavement material due to the mixing of pottery shells is thought to be due to the action of light and hard aggregates.

The permeability of the earth-based pavement material is 10 ⁻⁵ to 10 ⁻³ cm / s. If it is less than 10 ⁻⁵ cm / s, penetration into the basement will be poor. When it exceeds 10 ⁻³ cm / s, the water retention is inferior. The preferable permeability of the earth-based pavement material is 10 ⁻⁵ to 10 ⁻³ cm / s. If it is this range, it is the same as natural soil, and there exists an effect that it is permeable and does not impair water retention. The increase in the permeability of earth-based pavement materials due to the mixing of pottery shells is thought to be due to the fact that voids are created in the true sand and pottery shells.

Pure sand is a soil that has been weathered by granite, and is produced in western Japan. It contains a large amount of gravel and is used as wall soil. The main components are quartz, feldspar and colored minerals. For example, Kasawa Sangyo Co., Ltd. can be used.
The sieving passage size (particle size) of true sand is 10 mm or less. If it exceeds 10 mm, viscous soil or the like is mixed in the true sand soil, and the insufficiency of mixing of the solidifying material occurs in the mass of the viscous soil. If the particle size of the true sandy soil is 10 mm or less, the mixing ability with the solidifying material is high and a stable strength can be maintained.

Pottery shell (ceramics) is a kind of industrial waste obtained by crushing (or crushing) pottery into shells. For example, pottery shell recycled aggregate manufactured by Kyoritsu Crushing Co., Ltd. can be used. As other pottery shells, crushed items such as washstands and toilet bowls that are not sold during production can be used.
The sieve passing size (particle size) of the ceramic shell is 20 mm or less. If it exceeds 20 mm, it is difficult to produce the mixed material, and the construction is difficult and the construction speed is reduced.
If the size of the ceramic shell passing through the screen is 20 mm or less, it is possible to improve the material mixing property, productivity, and construction speed. Since the earthenware shell is 20 mm or less, the construction thickness of the earth-based pavement material on the ground (paved surface) is preferably 50 to 100 mm. When the construction thickness is less than 50 mm, cracks occur due to impact from the outside, resulting in inconvenience that weeds emerge.

As the solidifying material, for example, a cement-based solidifying material can be employed.
The sieve passing size (particle size) of the solidified material is, for example, 90 μm or less.
As a specific solidifying material, tough lock 3 type, which is a cement-based solidifying material for general soft soil (including cement components, inorganic materials, pozzolanic materials, and hydration stimulating materials) manufactured by Sumitomo Osaka Cement Co., Ltd. shall be adopted. Can do.

  The composition ratio of the earth-based pavement composition is 53.4-75.8% by weight of true sand, and 13.9-37.0% by weight of recycled aggregate made of ceramic shells obtained by crushing pottery. Since the material is 9.6 to 10.3% by weight, the natural landscape of the soil is not impaired, there is permeability, the strength is higher than that of the conventional product, and the durability is improved.

  If the blending ratio of pure sand is less than 53.4% by weight, the natural landscape of the soil will be impaired. On the other hand, when the pure sand soil exceeds 75.8% by weight, the strength decreases. If the ratio of the true sandy soil is in the range of 53.4 to 75.8% by weight, sufficient strength can be maintained without impairing the natural landscape of the soil.

  When the blending ratio of the recycled aggregate is less than 13.9% by weight, the strength is lowered and the economical efficiency is deteriorated. On the other hand, if the recycled aggregate exceeds 37.0% by weight, the mixability of materials is poor, variation occurs, and the strength decreases. When the blending ratio of the recycled aggregate is 13.9 to 37.0% by weight, it is excellent in high strength and durability, ensuring sufficient permeability and economical.

  When the blending ratio of the solidifying material is less than 9.6% by weight, the strength is lower than that of the conventional product. Moreover, when a solidification material exceeds 10.3 weight%, it is uneconomical and a natural landscape is impaired. If the blending ratio of the solidifying material is 9.6 to 10.3% by weight, the durability is improved and the natural landscape is not impaired.

The construction method of the earth-based pavement is as follows. First, 53.4 to 75.8% by weight of pure sand, 13.9 to 37.0% by weight of recycled aggregate made of ceramic shells crushed from ceramics, and solidified material 9.6. -10.3% by weight is mixed to prepare an earth-based paving material (paving material manufacturing step). Thereafter, an earth-based paving material is paved on the ground (road surface) (paving process), and water is sprayed onto the earth-based paving material after paving (watering process). Thereafter, the soil-based pavement material is cured and solidified (curing solidification step).
This is a kind of industrial waste that has high strength, high water permeability and durability, does not impair the natural landscape, is difficult to inhibit the growth of the roots of surrounding trees, can suppress the growth of weeds, and The pottery shell can be reused, which can reduce the cost.

As a pavement method for the earth-based pavement material, asphalt pavement, cement stabilization processing, or the like can be employed.
As a paving apparatus for earth-based paving materials, asphalt paving machines, backhoes, and the like can be used.
As a method of mixing the pure sand soil, the recycled aggregate, and the solidified material, a weight measurement, a container measurement mixing machine, or the like can be employed.
As a sand sand mixing device, a soil improvement mixing machine (fixed type, mobile type) is used.

As water for watering, for example, tap water is used.
The watering method can use the watering method of a cement stabilization processing worker. Watering may be before or after rolling of the earth-based pavement material. Or you may spray water during rolling.
As a watering device, a water supply tank of a watering vehicle, a high-pressure washing machine for construction, or the like can be used.
The amount of water spray (water content ratio w) is 15 to 18%. If it is less than 15%, curing is insufficient, and if it exceeds 18%, there is a disadvantage that strength is lowered. If it is in the range of 15 to 18%, a stable strength can always be obtained.

As a method for curing the earth-based pavement material, concrete curing (covering and protecting with a sheet or the like. In addition, when the surface is in a dry state, watering is performed) can be employed.
The curing period of the earth-based pavement is 1 to 7 days. If it is less than one day, there will be inconveniences such as breakage of the pavement surface and occurrence of peeling. If it is the range for 1 to 7 days, the pavement surface can be hardly damaged or peeled off.

Moreover, the construction thickness of the said earth-based pavement material is 5-10 cm.

  If the construction thickness of the earth-based pavement is less than 5 cm, cracks are likely to occur due to external impact. Moreover, when it exceeds 10 cm, it is uneconomical. If it is the range of 5-10 cm, there are few cracks and it is economical.

According to invention of Claim 1, 53.4-75.8 weight% of pure sandy soil, 13.9-37.0 weight% of recycle aggregates which consist of the ceramic shell which crushed the pottery, and solidification material 9. 6-10.3% by weight is mixed to obtain a soil-based pavement, so it has high strength, high water permeability and durability, does not impair the natural landscape, and inhibits the growth of the surrounding tree roots It is difficult to suppress the propagation of weeds, and the pottery shell, which is a kind of industrial waste, can be reused. Moreover, the cost can be reduced by using industrial waste as a part of the raw material.

In addition, since a recycled aggregate having a sieve passage size of 20 mm or less is adopted, the mixed material can be manufactured smoothly and the workability of the earth-based pavement is also high.

  Examples of the present invention will be specifically described below.

In FIG. 1, 10 is an earth-based pavement material according to the first embodiment of the present invention. The earth-based pavement material 10 is a mixed material in which pure sand soil 11, a recycled aggregate (ceramic shell) 12, and a solidifying material 13 are mixed at a predetermined mixing ratio.
As the pure sand soil 11, the pure sand soil made by Kyowa Sangyo Co., Ltd. is adopted. The size of the sand passing through the sand 11 is 10 mm. As the recycled aggregate 12, a pottery shell recycled aggregate manufactured by Kyoritsu Crushed Stone Co., Ltd. is adopted. The recycle aggregate 12 has a sieve passing size of 20 mm, and the solidified material 13 employs a general soft soil cement-based solidified material “Tough Rock 3” manufactured by Sumitomo Osaka Cement Co., Ltd. The blending amount (blending ratio) of each composition is 62.6% by weight for the true sand soil 11, 27.1% by weight for the recycled aggregate 12, and 10.3% by weight for the solidified material 13.
These are put into a mixer (mixing device) 14 and stirred and mixed in one batch for 1.5 minutes to produce an earth-based paving material 10 (FIG. 1).

Next, with reference to FIG. 2, the construction method of the earth-based pavement material 10 of Example 1 is demonstrated.
First, a predetermined amount of the earth-based pavement material 10 is spread on the road shoulder 15 using an asphalt finisher (FIG. 2a). A sidewalk or the like may be used instead of the road shoulder 15. Next, the earth-based paving material 10 is compacted by the roller 16, and the earth-based paving material 10 having a thickness of 10 cm is paved (FIG. 2b). Then, water is sprayed on the earth-based pavement 10 laminated on the road shoulder 15 until the water content ratio becomes 15% (FIG. 2c). Then, it is left to stand for a day and is cured and solidified (FIG. 2d).

Thus, since the earth-based pavement 10 was produced by mixing the recycled sand 12 made of ceramic shells with the pure sand 11 and the solidified material 13, the strength of the earth-based pavement 10 after the construction is a conventional product. Compared to this, high permeability and high durability can be obtained. Moreover, since the true sand soil 11 is the main material of the pavement 10, it is difficult to inhibit the growth of the roots of the surrounding trees without impairing the natural landscape, and the germination of weeds can be suppressed. Furthermore, pottery shells as a kind of industrial waste can be reused, which can be an environmental measure and can reduce the cost of raw materials.
And, since the blending ratio of the composition is 53.4% by weight for sand sand 11, 37.0% by weight for recycled aggregate 12, and 9.6% by weight for solidified material 13, the improvement in high strength and economy is achieved. The effect is obtained.
In addition, since the construction thickness of the earth-based paving material 10 is 10 cm, there is no protrusion of the end of the recycled aggregate 12 on the surface of the earth-based paving material 10 even when the recycled aggregate 12 having a sieve passing size of 20 mm is used. And the effect of not impairing permeability is obtained.

Next, the strength and permeability of the soil-based pavement material after construction are actually measured for the soil-based pavement material (Test Examples 1 to 6) of this invention and other soil-based pavement materials (Comparative Examples 1 and 2). Report the results of the comparison.
Pure sand soil has a standard water content ratio of 8.0%, a unit volume mass of 1,420 kg / m ³ , a gravel content (2 to 75 mm) of 24%, a sand content (75 μm to 2 mm) of 58%, and a silt content of 5 to 74 μm ( A material having a viscosity of less than 5 μm (18%) and a maximum particle size of 9.5 mm was used.

The ceramic shell, which is recycled aggregate, has a unit volume mass of 1,476 kg / m ³ , gravel (2 to 75 mm) 94%, sand (75 μm to 2 mm) 3%, silt content 5 to 74 μm (viscosity 5 μm) Less) 3%, maximum particle size 19 mm, uniformity coefficient 3.82 Uc, curvature coefficient Uc ′. The ceramic shell components were 0.91% Na ₂ O, 0.71% MgO, 24% Al ₂ O ₃ , 68% SiO ₂ , 2.0% K ₂ O and 1.7% CaO. %, TiO ₂ was 0.31%, Fe ₂ O ₃ was 1.3%, ZnO was 0.23%, and ZrO ₂ was 0.27%.
Tough rock type 3 (including cement components, inorganic materials, pozzolanic materials, and hydration stimulating materials), which is a general soft soil cement-based solidifying material manufactured by Sumitomo Osaka Cement Co., Ltd., was adopted as the solidifying material.
Tap water was adopted as the added water.

Test Example 1: The composition of the earth-based pavement material was 75.8% by weight of sand sand (10 mm or less), 13.9% by weight of ceramic shell (20 mm or less), 10.3% by weight of solidified material, and a water content ratio of about 15%. did.
Test Example 2: The composition of the earth-based pavement material was: sand sand (10 mm or less) 62.3% by weight, ceramic shell (20 mm or less) 27.8% by weight, solidified material 9.9% by weight, water content ratio of about 15% did.
Test Example 3 The composition of the earth-based pavement material was 62.5% by weight of sand sand (10 mm or less), 27.0% by weight of ceramic ware (13 mm or less), 10.5% by weight of solidified material, and a moisture content of about 15%. did.
Test Example 4 The composition of the earth-based pavement material was 63.8% by weight of sand sand (10 mm or less), 28.4% by weight of earthenware shell (20 mm or less), 7.8% by weight of solidified material, and a water content ratio of about 15%. did.
Test example 5: The composition of the earth-based pavement material was: sand sand (10 mm or less) 63.1% by weight, ceramic shell (20 mm or less) 28.0% by weight, solidified material 8.9% by weight, moisture content about 15%. did.
Test Example 6: The composition of the earth-based pavement material was 53.4% by weight of sand sand (10 mm or less), 37.0% by weight of earthenware shell (20 mm or less), 9.6% by weight of solidified material, and a moisture content of about 15%. did.
Comparative Example 1 The composition of the earth-based pavement material was 44.5% by weight of sand sand (10 mm or less), 46.3% by weight of ceramic shell (20 mm or less), 9.2% by weight of solidified material, and a moisture content of about 15%. did.
Comparative Example 2 The composition of the earth-based paving material was 89.3% by weight of true sand (10 mm or less), 10.7% by weight of solidified material, and a water content ratio of about 15%.
The water content ratio was determined from the amount of water added / dry weight (total solid content of the specimen).

1. Strength Test In Test Examples 1 to 6 and Comparative Example 1, the diameter was about 10 cm, the cross-sectional area was about 78.54 cm ² , the height was about 20 cm, the volume was about 1,570 cm ³ , the mass was about 3,250 g, and the wet density was about 2 g / cm ^3. And a specimen having a diameter of about 5 cm, a cross-sectional area of about 20 cm ² , a height of about 10 cm, a volume of about 200 cm ³ , a mass of about 400 g, and a wet density of about 2 g / cm ³ (Comparative Example 2) 24 days old).
Thereafter, a uniaxial compression test of each specimen was performed. The test method is a uniaxial compression test of JIS A 1216 soil.
Results of uniaxial compression test, test example 1 is 7.1 N / mm ^2, Test Example 2 is 7.4 N / mm ^2, Test Example 3 8.0 N / mm ^2, Test Example 4 5.7 N / mm ² test example 5 6.8N / mm ^2, test example 6 6.7 N / mm ^2, Comparative example 1 is 4.9 N / mm ^2, Comparative example 2 was 5.5 N / mm ² (Fig. 3 Graph).
Moreover, as can be seen from the graph of FIG. 3, it was confirmed that the range of 13.9 to 37.0% by weight of the ceramic shell was appropriate.

2. Water permeability test In Test Examples 1 to 3, 6 and Comparative Examples 1 and ² , specimens having a diameter of about 10 cm, a cross-sectional area of 78.54 cm ² , a height of about 12.73 cm, and a volume of 1,000 cm ³ were produced.
Thereafter, a water permeability (penetration) test of each specimen was performed. The test method is a water permeability test (variable water level) of JIS A 1218 soil.
The results are as follows.
Test Example 1; (D value 95%) 7.82 × 10 ⁻⁵ cm / s
Test Example 2; (D value 95%) 1.04 × 10 ⁻⁴ cm / s
Test Example 3 (D value 95%) 8.08 × 10 ⁻⁵ cm / s
Test Example 6; (D value 95%) 1.97 × 10 ⁻⁴ cm / s
Comparative Example 1 (D value 95%) 2.68 × 10 ⁻⁴ cm / s
Comparative Example 2 (D value 95%) 6.03 × 10 ⁻⁵ cm / s
(D value 90%) 7.28 × 10 ⁻⁵ cm / s
The D value is the degree of compaction of the specimen.

Thus, the uniaxial compressive strength of the earth-based pavement materials of Test Examples 1 to 3 and 6 increased by 21 to 45% compared to the earth-based pavement material of Comparative Example 2 in which no ceramic shell was mixed. In addition, the permeability coefficient is 7.82 × 10 ^{−5 to} 1.97 × 10 ⁻⁴ cm / s, and rainwater can be infiltrated into the underground well, and the water supply to surrounding trees is also good. There was found.

It is sectional drawing which shows the paving material preparation process of the construction method of the earth-based paving material which concerns on Example 1 of this invention. (A) is sectional drawing which shows the paving process of the construction method of the earth-based paving material which concerns on Example 1 of this invention. (B) is sectional drawing which shows another paving process of the construction method of the earth-based paving material which concerns on Example 1 of this invention. (C) is sectional drawing which shows the watering process of the construction method of the earth-based paving material which concerns on Example 1 of this invention. (D) is sectional drawing which shows the curing solidification process of the construction method of the earth-based pavement which concerns on Example 1 of this invention. It is a line graph which shows the relationship between the compounding rate of a recycled aggregate, and the intensity | strength of earth-based pavement material.

Explanation of symbols

10 Earth-based paving materials,
11 Pure sand,
12 Recycled aggregate,
13 Solidified material.

Claims (1)

It consists of 53.4-75.8% by weight of sand sand, 13.9-37.0% by weight of recycled aggregate made of ceramic shells crushed from pottery, and 9.6-10.3% by weight of solidified material , The size of the recycled aggregate is a soil-based paving material having a sieve passing size of 20 mm or less .

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