Magnesium-based solidification material, application method of magnesium-based solidification material, and pavement

Abstract

To improve strength of pavement and soil.SOLUTION: A magnesium-based solidifying material 15 includes magnesium and combustion ash of wood materials. The magnesium-based solidifying material 15 is used for pavement and soil improvement, for example. When using the magnesium-based solidifying material 15 for pavement, the magnesium-based solidifying material 15 is mixed with sand 16. Specifically, the sand 16 mixed with the magnesium-based solidifying material 15 is used as a paving material 14. When the magnesium-based solidifying material 15 is used for soil improvement, the magnesium-based solidifying material 15 is mixed with soil (earth). By including combustion ash of wood materials in the magnesium-based solidifying material 15, the strength of pavement, soil, etc. in which the magnesium-based solidifying material 15 is used can be further increased.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a magnesium-based solidification material, a method for applying the magnesium-based solidification material, and pavement. [Background technology]

[0002] Magnesium-based solidification materials are known as solidification materials used in paving and soil improvement. For example, Patent Document 1 discloses a pavement in which sand mixed with a magnesium-based solidification material is used as the paving material. In this case, the sand solidified by the magnesium-based solidification material is used as the paving material, so the pavement can be made strong. In addition, soil is improved to be strong by mixing a magnesium-based solidification material with soil, which is a type of sand. In addition, sand mixed with a magnesium-based solidification material is sprayed onto slopes, etc., to harden the surface of the slope and act as a weed control measure.

[0003] By using the magnesium-based solidification material for pavement and soil improvement, the strength of the pavement and soil can be increased to a certain extent. Furthermore, the magnesium-based solidification material does not leach alkaline components, etc. Therefore, the magnesium-based solidification material does not affect the surrounding pavement and soil due to the leaching of alkaline components, etc. from the magnesium-based solidification material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-51849 Summary of the Invention [Problem to be solved by the invention]

[0005] By using the above-mentioned magnesium-based solidification material for pavement and soil improvement, the strength of the pavement and soil can be increased to a certain extent without affecting the surrounding areas of the pavement and soil. However, a higher effect is desired for improving the strength of pavement and soil using the magnesium-based solidification material, and there is room for improvement in this regard. [Means for solving the problem]

[0006] The means for solving the above problems and their effects will be described below. The magnesium-based solidification material that solves the above problems contains magnesium and combustion ash of wood materials.

[0007] According to this configuration, since the magnesium-based solidification material contains combustion ash from wood materials, when the magnesium-based solidification material is used for pavement, soil, etc., the strength of the pavement, soil, etc. can be increased.

[0008] The magnesium-based solidification material may contain sand mixed with magnesium and combustion ash. The combustion ash is mixed to replace a portion of the sand. Furthermore, when the weight of the combustion ash is X and the weight of the sand is Y, a portion of the sand is replaced with the combustion ash so that the weight ratio X / (X+Y) is 0.01 to 0.35.

[0009] According to the above configuration, by mixing magnesium and combustion ash with sand as described above, when a magnesium-based solidification material containing magnesium, combustion ash, and sand is used in pavement, soil, etc., the strength of the pavement, soil, etc. can be effectively increased.

[0010] In a magnesium-based solidification material application method that solves the above problems, a magnesium-based solidification material containing magnesium and combustion ash from wood materials is mixed with sand at the application site. The magnesium-based solidification material is mixed with the sand so that the weight ratio X / (X+Y) is 0.01 to 0.35, where X is the weight of the combustion ash and Y is the weight of the sand.

[0011] According to this method, by mixing a magnesium-based solidification material containing magnesium and combustion ash with sand as described above, when the magnesium-based solidification material is used in pavement, soil, etc., the strength of the pavement, soil, etc. can be effectively increased.

[0012] A pavement that solves the above problems uses sand mixed with the following magnesium-based solidification material as a paving material: The magnesium solidification material contains magnesium and combustion ash of wood materials.

[0013] According to this configuration, by mixing a magnesium-based solidification material containing combustion ash from wood materials with sand and using the sand mixed with the magnesium-based solidification material as a paving material, the strength of the pavement can be increased. [Brief explanation of the drawings]

[0014] [Figure 1] Cross section showing soil-based pavement. [Figure 2] Cross-section showing wood-based pavement. [Figure 3] Graph showing the experimental results of Experiment 1. [Figure 4] Graph showing the experimental results of Experiment 2. [Figure 5] Graph showing the experimental results of Experiment 2. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of a magnesium-based solidifying material, a method for applying the same, and a pavement using the same will be described with reference to FIGS. <Soil-based pavement> The road pavement shown in Figure 1 is an earth-based pavement, comprising a roadbed 18, a subbase 11, and a surface layer 12. The roadbed 18 is formed by layering soil and compressing it in the thickness direction. The subbase 11 is located on top of the roadbed 18. The subbase 11 is formed by layering crushed stone 13 and other materials and compressing them in the thickness direction. The surface layer 12 is formed by laying a paving material 14 on the roadbed 11, smoothing it, and then compacting it. This paving material 14 is formed by mixing a magnesium-based solidification material 15 with sand 16 together with water. In other words, this earth-based pavement uses sand 16 mixed with a magnesium-based solidification material 15 as the paving material 14. The sand 16 here refers not only to rock particles that do not contain organic matter, but also to rock powder with organic matter added (soil). When mixing the magnesium-based solidification material 15 and sand 16, the moisture contained in the sand 16 may be used, or water may be added.

[0016] <Wood-based pavement> The road pavement shown in Figure 1 is a wood-based pavement, and comprises a roadbed 11 and a surface course 12. This surface course 12 is also formed by spreading a paving material 14 on the roadbed 11, smoothing it, and then compacting it. The paving material 14 is formed by mixing a magnesium-based solidifying material 15 with water, sand 16, and wood materials 17. In other words, in this wood-based pavement, sand 16 mixed with magnesium-based solidifying material 15 and wood materials 17 is used as the paving material 14. Wood chips, bark, etc. can be used as the wood materials 17.

[0017] <Magnesium-based solidification material 15> The magnesium-based solidification material 15 used in the above-mentioned soil-based and wood-based pavements contains magnesium and combustion ash from wood materials. The magnesium may be magnesium oxide or magnesium chloride. The combustion ash from wood materials may be combustion ash produced in a wood biomass boiler.

[0018] The magnesium-based solidifying material 15 is mixed with sand 16 used in the paving material 14. The combustion ash contained in the magnesium-based solidifying material 15 is mixed so as to replace a portion of the sand 16. With regard to substances other than the combustion ash (magnesium, etc.) in the magnesium-based solidifying material 15, the volume ratio of the sand 16 to the substances and moisture is set to, for example, 1.4. The volume ratio may be changed to a value other than 1.4.

[0019] Next, a method for applying the magnesium-based solidifying material 15 will be described. The magnesium-based solidification material 15 used for soil-based pavement and wood-based pavement is mixed with sand 16 at the construction site. The sand 16 mixed with this magnesium-based solidification material 15 is used as the pavement material 14. The magnesium-based solidification material 15 is mixed with the sand 16 so that the weight ratio X / (X+Y) falls within a predetermined range, where X is the weight of the combustion ash in the pavement material 14 and Y is the weight of the sand 16 in the pavement material 14.

[0020] The predetermined range may be, for example, 0.01 to 0.35. The predetermined range is preferably, for example, 0.05 to 0.25, and more preferably, 0.1 to 0.2. The numerical values ​​of this predetermined range are determined based on the following Experiments 1 and 2. Figures 3 to 5 show the results of Experiments 1 and 2.

[0021] (Experiment 1) In this experiment, water and a magnesium-based solidification material that does not contain wood combustion ash were mixed with sand, and the compressive strength of the sand was measured in one direction. In the graph of Figure 3 showing the results of Experiment 1, the horizontal axis represents the water-to-solidification ratio of the magnesium-based solidification material, and the vertical axis represents the compressive strength of the sand. The water-to-solidification ratio is the mass of magnesium contained in the magnesium-based solidification material divided by the mass of the water. The compressive strength of the sand is the upper limit of the force per unit area that the sand can withstand when compressed in one direction.

[0022] In Experiment 1, the volume ratio of sand to magnesium-based solidification material and water was varied to 0.69, 0.7, 1.0, 1.4, and 2.0, and the compressive strength of the sand was measured when the water-to-magnesium-based solidification material ratio was 0.6, 0.9, 1.0, and 1.2 at each volume ratio. The measured compressive strength values ​​are plotted in Figure 3. Figure 3 shows that a volume ratio of sand to magnesium-based solidification material and water of 1.4 is preferable for obtaining stable measurements when measuring the compressive strength.

[0023] (Experiment 2) In this experiment, the volume ratio of sand to magnesium-based solidification material and water was fixed at 1.4, and the water-to-solidification ratio of magnesium-based solidification material was varied to 0.6, 0.9, 1.0, and 1.2. Furthermore, for each water-to-solidification ratio of magnesium-based solidification material, the compressive strength of the sand in one direction was measured when the weight ratio X / (X+Y) was set to 0.1, 0.16, 0.2, 0.32, and 0.48. The weight ratio X / (X+Y) can be rephrased as the replacement rate when a portion of the sand is replaced with the combustion ash.

[0024] The measured values ​​of the compressive strength are plotted in Figure 4. Furthermore, Figure 4 also plots the measured values ​​of the compressive strength when the volume ratio of sand to magnesium-based solidifying material and water was set to 1.4 in Experiment 1. Figure 5 plots the strength ratio between the compressive strength when the weight ratio X / (X+Y), i.e., the replacement rate, was set to 0 and the compressive strength when the replacement rate was set to 0.1, 0.16, 0.2, 0.32, and 0.48.

[0025] The above-mentioned predetermined range of values ​​is determined based on the experimental results of Experiment 1 and Experiment 2 shown in FIGS. Next, the magnesium-based solidification material of this embodiment, the application method of the magnesium-based solidification material, and the effects of the pavement will be described.

[0026] (1) The magnesium-based solidification material 15 contains magnesium and combustion ash from wooden materials. This magnesium-based solidification material 15 is used, for example, for soil improvement and paving. When the magnesium-based solidification material 15 is used for paving, the magnesium-based solidification material 15 is mixed with the sand 16 of the paving material 14. That is, the paving material 14 is formed by mixing the magnesium-based solidification material 15, which contains magnesium and combustion ash from wooden materials, with the sand 16. When the magnesium-based solidification material 15 is used for soil improvement, the magnesium-based solidification material 15 is mixed with the soil (earth). By including combustion ash from wooden materials in such magnesium-based solidification material 15, the strength of the paving material 14 and soil in which the magnesium-based solidification material 15 is used can be increased.

[0027] (2) A magnesium-based solidification material 15 containing magnesium and combustion ash from wood-based materials is mixed with sand 16 at the construction site. The sand 16 mixed with this magnesium-based solidification material 15 is used as paving material 14. The magnesium-based solidification material 15 is mixed with sand 16 so that the weight ratio X / (X+Y) falls within a predetermined range, for example, 0.01 to 0.35, where X is the weight of the combustion ash and Y is the weight of the sand 16. By using this magnesium-based solidification material 15 containing magnesium and combustion ash in paving, soil, etc., the strength of the paving, soil, etc. can be effectively increased. To increase the strength of the paving, soil, etc., the predetermined range is preferably, for example, 0.05 to 0.25, and most preferably, 0.1 to 0.2.

[0028] (3) Combustion ash generated in a wood biomass boiler can be used as the combustion ash of wood materials contained in the magnesium-based solidification material 15. In wood biomass boilers, combustion ash generated by burning wood materials is discarded. Therefore, by using such combustion ash in the magnesium-based solidification material 15, the discarded combustion ash can be reused. As a result, using the combustion ash in the magnesium-based solidification material 15 can contribute to environmental conservation.

[0029] (4) When the magnesium-based solidification material 15 is used in pavement, soil, etc., the combustion ash of the wood material contained in the magnesium-based solidification material 15 does not leach alkaline components, etc. into the surrounding areas of the pavement and soil. This prevents the magnesium-based solidification material 15 from affecting the surrounding areas of the pavement and soil due to the leaching of alkaline components, etc. from the magnesium-based solidification material 15. Therefore, when the magnesium-based solidification material 15 is used in pavements such as soil-based pavements and wood-based pavements that are constructed in rich natural environments, it is possible to prevent the magnesium-based solidification material 15 from affecting the natural environment around the pavement.

[0030] The above embodiment can be modified as follows, for example: The above embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. The magnesium-based solidification material 15 may be used for pavements other than earth-based pavements and wood-based pavements.

[0031] Magnesium-based solidification materials can also be used to prevent weeds on slopes, etc. In this case, sand mixed with magnesium-based solidification materials is sprayed onto the slope, hardening the slope and preventing weeds on the slope.

[0032] The predetermined range may be outside the range of 0.01 to 0.35. The magnesium-based solidification material 15 may contain magnesium, combustion ash from wood-based materials, and sand. In this case, the combustion ash is mixed to replace a portion of the sand. When the weight of the combustion ash is X and the weight of the sand is Y, a portion of the sand is replaced with the combustion ash so that the weight ratio X / (X+Y) falls within a predetermined range. The predetermined range may be, for example, 0.01 to 0.35. The predetermined range is preferably, for example, 0.05 to 0.25, and more preferably, 0.1 to 0.2. [Explanation of symbols]

[0033] 11...Roadbed 12…Surface layer 13...Crushed stone 14...Paving materials 15...Magnesium-based solidification material 16...Sand 17…Wood material 18...Roadbed

Claims

1. A magnesium-based solidification material containing magnesium and combustion ash of wood materials, sand into which the magnesium and the combustion ash are mixed; The combustion ash is mixed to replace a portion of the sand; A magnesium-based solidification material in which a portion of the sand is replaced with the combustion ash so that the weight ratio X / (X+Y) is 0.01 to 0.35, where X is the weight of the combustion ash and Y is the weight of the sand.

2. A magnesium-based solidification material containing magnesium and combustion ash of wood materials is mixed with sand at the construction site, The magnesium-based solidification material is mixed with the sand so that the weight ratio X / (X+Y) is 0.01 to 0.35, where X is the weight of the combustion ash and Y is the weight of the sand.

3. A magnesium-based solidification material containing magnesium and combustion ash of wood materials is mixed with sand, The magnesium-based solidifying material is mixed with the sand so that the weight ratio X / (X+Y) is 0.01 to 0.35, where X is the weight of the combustion ash and Y is the weight of the sand; The pavement uses sand mixed with this magnesium-based solidifying agent as the paving material.

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