Bamboo pavement

Abstract

To propose a pavement using a bamboo material which can be easily constructed regardless of a new pavement or an existing pavement.SOLUTION: The bamboo material pavement includes a thin layer of crushed bamboo material surface layer formed on the pavement, and the crushed bamboo material surface layer is composed of a mixed material obtained by mixing at least a binder, crushed bamboo material, and a separation inhibitor. The method for constructing the bamboo material pavement includes at least a step of mixing a binder, crushed bamboo material, and a separation inhibitor to form a mixed material, and a step of spraying the mixed material on the pavement to form a crushed bamboo material surface layer.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This paper discloses paving technology using bamboo. [Background technology]

[0002] Wood-based pavements that are laid on park walkways and the like are constructed by a method in which a surface layer of wood is laid evenly to a thickness of about 3 cm to 5 cm on top of a pavement such as asphalt or concrete. As an example of such wood-based pavements, Patent Document 1 discloses a bamboo pavement in which a concrete pavement is newly laid and a bamboo surface layer is formed on the surface, and the bamboo surface layer is made of a mixture of only bamboo chips, fibers, or powder and a binder.

[0003] In the case of wood-based pavement constructed by a leveling method in which the surface layer of wood is about 5 cm thick, cracks and warping are likely to occur due to drying shrinkage, mainly due to the nature of wood, unless the underlying asphalt or concrete pavement is new and strong. Therefore, for example, Patent Document 1 discloses a wood-based pavement in which a concrete pavement made of a specified mixture of materials is newly constructed for the bamboo pavement, and a surface layer of bamboo is formed on the pavement. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3383246 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the prior art, the present invention proposes a bamboo pavement that is less likely to crack or warp after construction and a construction method thereof, and can be applied to both newly constructed pavements such as asphalt or concrete (newly constructed pavements) and existing pavements (existing pavements). [Means for solving the problem]

[0006] One embodiment of the bamboo pavement of the present invention is characterized in that it includes a thin layer of crushed bamboo surface layer formed on the pavement, and the crushed bamboo surface layer is composed of a mixed material that is a mixture of at least a binder, crushed bamboo, and a separation inhibitor.

[0007] Another aspect of the bamboo pavement includes a primer formed on the pavement and a thin layer of crushed bamboo surface layer formed on the primer, and is characterized in that the crushed bamboo surface layer is composed of a mixed material that is a mixture of at least a binder, crushed bamboo, and a separation inhibitor.

[0008] In these bamboo paving embodiments, the crushed bamboo surface layer may further contain pigments. The thin layer refers to a layer with a thickness of 10 mm or less, and the crushed bamboo surface layer in the bamboo paving described above is preferably 3 mm or less in thickness. The crushed bamboo used in this thin layer is preferably made of crushed pieces with a maximum length of 2 mm or less.

[0009] As a method for constructing the bamboo pavement as described above, the construction method according to one aspect of the present invention includes the steps of mixing at least a binder, crushed bamboo, and a separation inhibitor to prepare a mixed material, and spraying the mixed material onto the pavement to form a crushed bamboo surface layer. The spraying of the mixed material can be performed in at least two spraying operations, a first spraying operation in which the mixed material is sprayed onto the pavement and dried, and a second spraying operation in which the mixed material is further sprayed onto the pavement after the first spraying operation and dried.

[0010] Another embodiment of the bamboo pavement construction method includes the steps of mixing at least a binder, crushed bamboo, and a separation inhibitor to prepare a mixed material, applying a primer to the pavement, and spraying the mixed material onto the applied primer to form a crushed bamboo surface layer. The spraying of the mixed material can be performed in at least two spraying operations: a first spraying operation in which the mixed material is sprayed onto the primer and dried, and a second spraying operation in which the mixed material is further sprayed after the first spraying and dried.

[0011] In these application methods, the mixed material may further contain a pigment. The thickness of the crushed bamboo surface layer formed by spraying is preferably 3 mm or less. The crushed bamboo is crushed and sieved to preferably have a maximum length of 2 mm or less. Effect of the Invention

[0012] The crushed bamboo surface layer of the present invention uses crushed bamboo consisting of fine crushed pieces of 2 mm or less, and by mixing this crushed bamboo with at least a binder and a separation inhibitor to form a mixed material, it can be formed into a thin layer of, for example, 3 mm or less by spraying. Since it is a thin layer, problems such as cracking and warping are unlikely to occur, and as a result, it can be easily applied as a surface layer for both new and existing pavements. In addition, this mixed material that can be sprayed can be applied not only on horizontal surfaces such as road surfaces, but also on inclined and vertical surfaces without sagging. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic cross-sectional view showing an embodiment of bamboo paving in the case of asphalt paving. [Diagram 2] FIG. 2 is a schematic cross-sectional view showing an embodiment of a bamboo pavement on a concrete pavement. [Diagram 3] FIG. 2 is a process diagram illustrating an embodiment of a bamboo paving construction method. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to specific examples.

[0015] Figure 1 shows a schematic cross-sectional view of an example of bamboo pavement in which a crushed bamboo surface layer is applied on a newly constructed or existing asphalt pavement. As shown in the figure, a thin layer of crushed bamboo surface layer is formed on the surface of the asphalt pavement. The thickness of the thin layer of crushed bamboo surface layer is 3 mm or less, and optimally 2 mm or less.

[0016] FIG. 2 shows a schematic cross-sectional view of an example of a bamboo pavement in which a crushed bamboo surface layer is applied onto a newly constructed or existing concrete pavement. As shown in the figure, a primer is applied to the surface of the concrete pavement, and a thin layer of crushed bamboo surface layer is formed on the primer. In this example, a primer is applied to the concrete pavement surface as an adhesion promoter to improve the adhesion of the crushed bamboo surface layer. The thickness of the thin layer of crushed bamboo surface layer is 3 mm or less, as in the example of FIG. 1, and is optimally 2 mm or less.

[0017] Figure 3 shows an example of a process diagram for constructing these bamboo pavements.

[0018] Step 1 is the preparation stage, in which the area to be paved with asphalt, concrete, or other mortar is cleaned with water, etc., and masked if necessary.

[0019] In step 2, the materials required for the surface layer of the crushed bamboo are mixed to create a mixture. The components of the mixture are binder (and water), crushed bamboo, and separation inhibitor, and pigment is added as necessary. The optimal ratio of each material by weight is as follows: ·Binding material: 30~50% ·Wednesday: 20~40% ·Crushed bamboo material: 10~40% Separation inhibitor: 2~10% Pigment: 0~5%

[0020] A water-based acrylic resin is used as the binder. Other water-based resins such as water-based urethane resin and water-based epoxy resin can also be used, but water-based acrylic resin is the best in terms of the uniformity of the finish, prevention of sagging, light resistance, workability when spraying with a spray gun, environmental aspects, and ease of handling.

[0021] Crushed bamboo is made by crushing felled bamboo, sieving it, and preparing a collection of crushed pieces below a certain size. Each crushed piece of bamboo can be fibrous, rectangular (angular), circular, or elliptical, but in any case, by sieving the bamboo, the maximum length of each crushed piece, that is, the longest side, diameter, or major axis of the crushed piece, is reduced to 2 mm or less. Crushed pieces with a maximum length exceeding 2 mm are not suitable for forming a thin layer, nor are they suitable for spray application using a simple spray gun.

[0022] The anti-segregation agent (also called a thickener) is used to improve the mixing of the bamboo powder with the binder, so that the bamboo powder is distributed evenly throughout the layer. Without the anti-segregation agent, the lighter bamboo powder may float in the binder, causing the two to separate and not mix properly. A suitable anti-segregation agent is a powdered mineral.

[0023] Pigments are used as needed to adjust the shade of the finished bamboo paving (lighter / dark, blackish / white, etc.).

[0024] The above materials are placed in a container such as a bucket and mixed using a hand mixer to form a slurry-like mixed material.

[0025] Step 3 is a primer application step that can be applied when working on concrete pavement. Step 3 is not necessary for asphalt pavement (hence the dotted line). The primer that is applied to the concrete pavement as an adhesion promoter can be a commercially available resin-based primer. For example, the primer is applied to the work area at 0.1 to 0.2 kg / m. 2 Apply with.

[0026] Step 4 is the first spraying of the mixed material. An appropriate amount of the mixed material prepared in step 2 is placed in a hopper spray gun and sprayed onto the area to be treated. For example, the mixed material is sprayed at 1.5 kg / m 2 After spraying is complete, leave it to dry for about 30 minutes in step 5.

[0027] Step 6 is the second spraying of the mixed material. The remaining mixed material is placed in a hopper spray gun and sprayed onto the area where the first spraying and drying have been completed. For example, the second spraying operation uses 1.5 kg / m of mixed material. 2 After spraying is complete, dry for about 30 minutes in step 7, then cure. Curing is required to completely harden the resin, and the recommended curing time is at least 12 hours in summer and at least 24 hours in winter.

[0028] In the construction method of this embodiment, the mixed material was sprayed in two separate steps. To explain this by giving specific numerical examples, the total amount of the mixed material sprayed was 1.0 to 3.0 kg / m 2 The first spraying step is 0.5 to 1.5 kg / m 2 , 0.5-1.5kg / m for the second spraying 2 To prevent poor curing, spray 0.5 to 1.5 kg / m 2 By these two spraying operations, a thin layer of crushed bamboo surface layer with a thickness of 3 mm or less, preferably 1 to 2 mm, is formed.

[0029] The number of times the mixed material is sprayed may be divided into three or more times. For example, 1.0 kg / m 2 The spraying work was carried out three times with a total spraying amount of 3.0 kg / m 2 The more times the spraying process is performed, the more natural the texture and depth of color will be in the surface layer that is formed.

[0030] Performance evaluation tests were carried out using the specimens prepared according to the above construction method. The test results are shown below.

[0031] [1] Adhesion strength The adhesion strength was measured using a tensile tester of the Construction Research Institute type. The result was 0.81N / mm for the asphalt pavement specimen. 2 , 0.53N / mm for concrete pavement specimens 2 According to the Construction Guidelines for Outdoor Sports Facilities (Japan Sports Facilities Association, revised in 2012), the standard physical property value of acrylic resin surface materials is 0.3 N / mm 2Therefore, it is found that the adhesive strength is sufficient. [2] Skid resistance value (BPN) The test results for the specimens showed a value of 70 when wet. According to the Pavement Design and Construction Guidelines (Japan Road Association, 2006 edition), the guideline value is 40 when wet, so it is clear that the material has sufficient skid resistance. [3] GB coefficient (shock absorption) · SB coefficient (rebound elasticity) The results of the GB and SB tests on the specimens showed a GB coefficient (%·cm) of 23 and a SB coefficient (%·cm) of 5. When these results were compared with the values ​​given in the Pavement Performance Evaluation Method Supplement - Evaluation Methods for Performance Indicators Required as Needed (Japan Road Association), they fell within the walkability range comparable to that of clay-based / asphalt elastic mixtures. It was confirmed that the pavement has better shock absorption and is easier to walk on than general asphalt and concrete pavements. [4] Penetration water amount An on-site permeability test was conducted to investigate the amount of water seepage when the crushed bamboo surface layer of the embodiment was applied on a permeable pavement. According to the Pavement Design and Construction Guidelines (Japan Road Association, 2006 edition), the guideline value for the amount of water seepage on sidewalks is 300ml / 15s. The amount of water seepage on the permeable pavement before spraying the mixed material was 1218ml / 15s, and after spraying the mixed material, the amount of water seepage was 702ml / 15s. Although a 45.6% decrease was observed, it was confirmed that the amount of water seepage was sufficient for the guideline value.

[0032] According to the embodiment described above by way of example, the following advantages are obtained. By using bamboo, it is possible to obtain a pavement surface that blends in with nature, making it very suitable for use in zoos, natural parks, etc. In such cases, it can be applied to already-paved roads, making it cheap and easy to install. The crushed bamboo surface layer uses a mixed material containing the above-mentioned components, and the crushed bamboo is pulverized into small pieces of 2 mm or less, so the mixed material can be sprayed and applied, resulting in a thin layer. This mixed material can be applied with simple spraying machines such as hopper spray guns and lysine guns, as well as large-scale applications using spraying machines, and because it is sprayed, it can be applied easily and at low cost to both new and existing pavements. In addition, because it is sprayed and applied in a thin layer, it can be applied not only to horizontal surfaces such as road surfaces, but also to inclined and vertical surfaces without sagging, making it versatile. Since it is a spray-applied method, when applying it to existing pavement, even if there are cracks in the pavement, it can be easily repaired with repair material. The surface layer of the crushed bamboo is a thin layer applied by spraying, so it hardens in a short time and the curing time is short, making it possible to open the building early. Even if the surface layer of the crushed bamboo develops cracks due to aging, it can be easily repaired by spraying it again from above.

[0033] Although several embodiments of the present invention have been shown and described above, various other embodiments can be conceived based on the concept of the present invention understood from the above description.

Claims

1. A bamboo pavement including a thin layer of crushed bamboo surface layer formed on the pavement, This bamboo pavement is made of a mixed material in which the crushed bamboo surface layer is made of at least a binder, crushed bamboo, and a separation inhibitor.

2. A bamboo pavement comprising a primer formed on the pavement and a thin layer of crushed bamboo surface layer formed on the primer, This bamboo pavement is made of a mixed material in which the crushed bamboo surface layer is made of at least a binder, crushed bamboo, and a separation inhibitor.

3. The bamboo pavement according to claim 1 or 2, wherein the mixed material further comprises a pigment.

4. The bamboo pavement according to claim 1 or 2, wherein the crushed bamboo surface layer has a thickness of 3 mm or less.

5. The bamboo pavement according to claim 1 or 2, wherein the crushed bamboo consists of crushed pieces having a maximum length of 2 mm or less.

6. A method for constructing bamboo pavement, comprising the steps of: Mixing at least a binder, crushed bamboo, and a separation inhibitor to form a mixed material; and spraying the mixed material onto the pavement to form a crushed bamboo surface layer.

7. The spraying of the mixed material includes: a first spraying operation of spraying the mixed material onto the pavement and drying it; The construction method according to claim 6, wherein the construction method comprises at least two spraying operations, that is, a second spraying operation in which the mixed material is further sprayed and dried after the first spraying operation.

8. A method for constructing bamboo pavement, comprising the steps of: Mixing at least a binder, crushed bamboo, and a separation inhibitor to form a mixed material; applying a primer onto the pavement; and spraying the mixed material onto the primer to form a crushed bamboo surface layer.

9. The spraying of the mixed material includes: a first spraying operation of spraying the mixed material onto the primer and drying it; The construction method according to claim 8, wherein the construction method comprises at least two spraying operations, that is, a second spraying operation in which the mixed material is further sprayed and dried after the first spraying operation.

10. The application method according to any one of claims 6 to 9, further comprising adding a pigment to the mixed material.

11. The construction method according to any one of claims 6 to 9, wherein the thickness of the crushed bamboo surface layer after formation is 3 mm or less.

12. The construction method according to any one of claims 6 to 9, wherein the crushed bamboo material is made by crushing bamboo, sieving it, and forming crushed pieces having a maximum length of 2 mm or less.

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