Civil engineering materials and methods for manufacturing civil engineering materials

Abstract

To provide a civil engineering material that is easy to use and can further improve the water permeability and water retentivity of land to be constructed, and a method for manufacturing the same.SOLUTION: A manufacturing method of a civil engineering material includes the steps of: charging crushed stones 1, a solidification material 2, a nodulizing agent 3 and water 4 into a mixing container 5 and sufficiently stirring them to form a mixed material 6; then leaving the mixed material 6 as it is in an environment where rainwater does not fall into the mixing container and moisture does not enter the mixing container 5, and when the moisture 7 contained in the mixed material 6 is evaporated and the moisture content of the mixed material 6 reaches 5 mass% to 15 mass%, finishing drying to obtain a civil engineering material 10.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to civil engineering materials used when improving the properties of land such as sports grounds, squares, garden paths, and sidewalks, and a method for manufacturing the same.

Background Art

[0002] Regarding the technology for improving the properties of land such as sports grounds and squares, various proposals have been made conventionally. As those related to the present invention, for example, there are the "soil improvement method" described in Patent Document 1, the "civil engineering material and civil engineering material manufacturing method" described in Patent Document 2, or the "ground improvement method" described in Patent Document 3.

[0003] In the inventions described in these documents, in each case, after spreading a mixture obtained by adding and mixing a solidifying agent and an aggregating agent to the soil and sand of the land to be improved, it is rolled and solidified to form an aggregated structure in the soil and sand, thereby improving the water permeability and water retention of the land.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] By implementing the inventions described in Patent Documents 1 to 3, it is possible to form soil and ground having water permeability and water retention suitable for each construction site. However, facilitating the construction and further improving the water permeability and water retention of the construction target land are still important issues to be solved in the future.

[0006] Therefore, the problem that the present invention aims to solve is to provide a civil engineering material and a method for manufacturing the same that is easy to use and can further improve the water permeability and water retention of the land to be constructed. [Means for solving the problem]

[0007] The civil engineering materials according to the present invention are One or more of the following: crushed stone, recycled concrete, recycled crushed stone run, One or more of the following: cement-based solidifying agent, lime-based solidifying agent, or gypsum-based solidifying agent, The material contains a polymer compound having an aggregation effect and water, characterized in that the water content is 5% to 15% by mass.

[0008] In the aforementioned civil engineering materials, it is desirable that the polymer compound is a polymer compound consisting of a magnesium salt of an acrylic acid-dimethylaminoethyl methacrylate copolymer and polyethyleneimine.

[0009] Next, the method for manufacturing civil engineering materials according to the present invention is: One or more of the following: crushed stone, recycled concrete, recycled crushed stone run A mixing step in which one or more cement-based solidifying agents, lime-based solidifying agents, or gypsum-based solidifying agents are mixed with an aqueous solution containing a polymer compound having an aggregation effect and water to form a mixed material, The present invention is characterized by comprising a drying step of evaporating the water contained in the aforementioned mixture to form civil engineering materials.

[0010] In the aforementioned method for manufacturing civil engineering materials, it is desirable that in the drying step, the same amount of water added in the mixing step is evaporated from the mixed material.

[0011] In the above method for manufacturing civil engineering materials, it is desirable that the moisture content of the mixed material is evaporated in the drying step until it reaches 5% to 15% by mass.

[0012] In the method for manufacturing the civil engineering material, it is desirable that the polymer compound is a polymer compound composed of a complex of a magnesium salt of a dimethylaminoethyl acrylate / methacrylate copolymer and polyethyleneimine.

Advantages of the Invention

[0013] According to the present invention, it is possible to provide a civil engineering material that is easy to use and can further improve the water permeability and water retention of the construction target land, and a method for manufacturing the same.

Brief Description of the Drawings

[0014] [Figure 1] It is a partially omitted process diagram showing a method for manufacturing a civil engineering material according to an embodiment of the present invention. [Figure 2] It is a partially omitted process diagram showing a method for manufacturing a civil engineering material according to other embodiments.

Modes for Carrying Out the Invention

[0015] Based on FIG. 1, a method for manufacturing a civil engineering material and a civil engineering material according to an embodiment of the present invention will be described. As shown in FIG. 1, crushed stone 1, a solidifying agent 2, an agglomerating agent 3, and water 4 are put into a mixing container 5 and sufficiently stirred to form a mixture 6 (mixing step).

[0016] The addition amounts of the solidifying agent 2, the agglomerating agent 3, and water 4 to the crushed stone 1 are set according to the construction conditions, and are not limited. For example, in the present embodiment, the addition amounts shown below are set.

[0017] Crushed stone 1 (C-40): 1 cubic meter Solidifying agent 2: 20 kg to​​​​​​​The crushed stone 1 (C-40) means crushed stone with a particle size of 40 mm or less. The solidifying agent 2 is a cement-based solidifying agent, but it is not limited thereto, so a lime-based solidifying agent, a gypsum-based solidifying agent, etc. can also be used. The granulating agent 3 is not limited either, but in this embodiment, a chemical agent containing a polymer compound composed of a complex of a magnesium salt of a dimethylaminoethyl acrylate-methacrylic acid copolymer and polyethyleneimine, namely, "(trade name) SS-M1" of "Global Research Institute Co., Ltd." was used.

[0019] When the admixture 6 is formed by the mixing step, it is left standing in an environment where rainwater does not pour into or moisture does not penetrate into the mixing container 5, and the moisture 7 contained in the admixture 6 is evaporated (drying step). When the moisture 7 has evaporated in the drying step and the water content rate of the admixture 6 has reached 5% to 15% by mass, the drying step ends and the civil engineering material 10 is completed.

[0020] Regarding the determination of the end timing of the drying step (the completion timing of the civil engineering material 10), the change in the mass (weight) of the admixture 6 with the passage of time in the drying step is measured, and when the measured value becomes a value indicating that the same amount of moisture as the water 4 added in the mixing step has evaporated, the end of the drying step (the completion of the civil engineering material 10) can be set.

[0021] The completed civil engineering material 10 can be carried into the construction site of the soil improvement work and used for the soil improvement work described later. However, if it is filled in an airtight packaging bag 8 and sealed, no solidification reaction or granulation action will occur, so it can be stored, transported, or distributed in the market in that state.

[0022] On the other hand, when the completed civil engineering material 10 is carried into the construction site of the soil improvement work, placed in the construction target area, spread evenly, rolled, and then left standing, the granulation reaction progresses with the passage of time and a granulated structure is formed, so the water permeability and water retention of the improved land are greatly improved. In addition, since the water content rate of the civil engineering material 10 is maintained within the above-described range, the granulation reaction is not inhibited even when the water content rate of the land at the construction site is high, so it is easy to use.

[0023] Next, with reference to Figure 2, other embodiments of the civil engineering material manufacturing method and civil engineering material will be described. As shown in Figure 2, in this embodiment, a mixed material 16 is formed by stirring crushed stone 1, solidifying agent 2, aggregation agent 3, and water 4 at the construction site of the soil improvement work (mixing step). In this embodiment as well, the amount of solidifying agent 2, aggregation agent 3, and water 4 added to the crushed stone 1 is not limited, but for example, it can be the same as the amount added in the embodiment described above (see paragraph 0017).

[0024] Once the mixed material 16 is formed by the mixing process described above, the mixed material 16 is left to stand in a condition where it is not exposed to rainwater or moisture, allowing the moisture 17 contained in the mixed material 16 to evaporate (drying process). When the moisture 17 has evaporated during the drying process and the moisture content of the mixed material 16 is 5% by mass to 15% by mass, the drying process is completed and the civil engineering material 20 is finished.

[0025] When the completed civil engineering material 20 is poured into the construction area, spread, compacted, and then left to stand, the granulation reaction progresses over time, forming a granular structure, which significantly improves the permeability and water retention of the improved soil. Furthermore, because the moisture content of the civil engineering material 20 is within the aforementioned range, it can be used even when the moisture content of the soil at the construction site is high, without the granulation reaction being inhibited, making it easy to use. In addition, since the civil engineering material 20 does not solidify unless compacted, it can be stored and transported in this state.

[0026] In the embodiment shown in Figure 2, crushed stone 1 (C-40) and solidifying agent 2 are brought into the construction site for soil improvement work to form civil engineering materials 20. However, the invention is not limited to this, and it is also possible to use crushed RC40 (not shown) instead of crushed stone 1 (C-40) to form civil engineering materials (not shown) similar to civil engineering materials 20. RC-40 refers to aggregate with a particle size of 40 mm or less, formed using construction waste such as concrete.

[0027] In the civil engineering materials 10 and 20 shown in Figures 1 and 2, crushed stone 1 is used. However, it is also possible to form civil engineering materials using one or more of recycled concrete or recycled crushed stone run (not shown) instead of crushed stone 1, or together with crushed stone 1. In any case, the same effects and properties as civil engineering materials 10 and 20 will be achieved.

[0028] The civil engineering material manufacturing method and civil engineering materials 10, 20 described based on Figures 1 and 2 are illustrative examples of the civil engineering material manufacturing method and civil engineering materials according to the present invention, and the civil engineering material manufacturing method and civil engineering materials according to the present invention are not limited to the civil engineering material manufacturing method and civil engineering materials 10, 20 described above. [Industrial applicability]

[0029] The civil engineering materials and the method for manufacturing civil engineering materials according to the present invention can be widely used in industrial fields such as the civil engineering and construction industry. [Explanation of symbols]

[0030] 1. Crushed stone 2. Solidifying agent 3. Granulation agent 4 water 5 Mixing container 6,16 Mixed materials 7,17 Moisture 8 Packaging bag 10,20 Civil engineering materials

Claims

1. One or more of the following: crushed stone, recycled concrete, recycled crushed stone run, One or more of the following: cement-based solidifying agent, lime-based solidifying agent, or gypsum-based solidifying agent, A polymer compound having an aggregation effect, It contains a mixture formed by thoroughly mixing water and [another ingredient]. The moisture content is 5% by mass to 15% by mass, Civil engineering materials are sealed in airtight packaging bags to allow storage without the hydration reaction and granulation action of the solidifying agent occurring.

2. The civil engineering material according to claim 1, wherein the polymer compound is a polymer compound comprising a composite of a magnesium salt of an acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine.

3. One or more of the following: crushed stone, recycled concrete, recycled crushed stone A mixing step in which one or more cement-based solidifying agents, lime-based solidifying agents, or gypsum-based solidifying agents are mixed with an aqueous solution containing a polymer compound having an aggregation effect, and water to form a thoroughly mixed mixture, A drying process to form civil engineering materials by evaporating the water contained in the aforementioned mixture until the content becomes 5% by mass to 15% by mass, A method for manufacturing civil engineering materials, comprising the step of filling the formed civil engineering materials into airtight packaging bags in a sealed state so that they can be stored in a state in which no hydration reaction or aggregation reaction of the solidifying agent occurs.

4. The method for manufacturing civil engineering materials according to claim 3, wherein in the drying step, the same amount of water as the amount of water added in the mixing step is evaporated from the mixed material.

5. The method for producing civil engineering materials according to claim 3 or 4, wherein the polymer compound is a polymer compound comprising a composite of a magnesium salt of an acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine.

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