JP4292648B2 - Method for checking the degree of mixing between earth and sand and improved additives - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for inspecting the degree of mixing of earth and sand and an improved additive, and more particularly, to a method in which the degree of mixing can be easily determined.
[0002]
[Prior art]
The improvement principle of the soil stabilization treatment method is to improve the physical and mechanical properties of the ground by chemical treatment with additives mixed with the soil and physical treatment such as rolling and compaction. . For example, various effects can be exhibited such as mixing cement with earth and sand as an improving additive to improve strength and reducing the permeability coefficient by mixing bentonite. In this case, uniform mixing of the additive with the earth and sand is important for improving the required properties and ensuring economic efficiency.
[0003]
[Problems to be solved by the invention]
However, conventionally, there is no significant difference in visual changes such as color changes before and after the mixing of additives, so the degree of mixing cannot be confirmed depending on simple means such as visual means that can provide clear results. It was difficult to confirm directly at the work site whether or not the degree of mixing was reached. Therefore, at the work site, it is necessary to analogize the degree of mixing to some extent by the mixing agitation time of the auger, etc., and it is necessary to collect various specimens and perform various analyses. For this reason, there are the following problems.
[0004]
In other words, although the analysis cost is high, the specimen itself is only a partial sample, so it is not possible to grasp the degree of mixing of the entire improved soil, and it takes time until the analysis results become clear. In addition to having to delay, it was difficult to judge the change in appearance, so it was not possible to make a simple judgment using photographs.
[0005]
On the other hand, when bentonite is used to reduce the permeability coefficient of the sediment to be improved, it is necessary to spend a considerable amount of the cost of the bentonite, etc., and the influence of the cost increase on the overall construction management combined with the construction facility cannot be ignored. It was a thing.
[0006]
The present invention has been made to solve the above problems, and sand mixtures degree can immediate and convenient clearly confirmed, also was to be working to decrease permeability of sediment easily and cost in construction site A method for inspecting the degree of mixing with an improved additive is provided.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention mixes calcium-based particles that form scales by contacting with water or the like in advance in the additive when the additive is added to the soil to be improved. Thus, the water permeability of the earth and sand is lowered, and the mixing degree of the earth and sand and the improved additive is determined by visually confirming the calcium-based particles whose shape has been changed by forming a scale.
[0010]
In the inspection method of the present invention, it allows allowed to drop conveniently reliably without imposing any effort the permeability of soil to be processed by mixing the calcium-based particles forming the scale in the advance and additives To do. On the other hand, calcium-based particles to form a scale is to deform to a different shape not spherical, it is possible to verify the mixing degree of stability processing degree easily.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described . First, as a reference example, a method for inspecting the degree of mixing of earth and sand and an improved additive when colored powder is used as a foreign substance will be described. As the colored powder, for example, high-strength colored slag obtained by the method described in JP-A-4-224146 is preferably used. This colored slag is composed of CaO source material, Fe ₂ 0 ₃ so that the weight ratio (CaO + Fe ₂ 0 ₃ ) / (Si0 ₃ + Al ₂ 0 ₃ ) of the molten slag as waste is 0.10 to 0.50. Source composition, SiO ₂ source material and / or Al ₂ O ₃ source material addition process for adjusting composition, melting composition-adjusted waste process, cooling eluate to slag, slag from 900 to It is a high-strength colored slag obtained by a ripening treatment in an atmosphere of 1300 ° C. for 0.1 to 3.0 hours, and is an inexpensive recycled material generally used for applications such as aggregates.
[0012]
The obtained high-strength colored slag is colored in various colors such as yellow, yellowish green, brown, and silver by adjusting the weight ratio (CaO + Fe ₂ 0 ₃ ) / (Si0 ₃ + Al ₂ 0 ₃ ) and heat treatment conditions. Slag. This colored slag is pulverized after production, and the particle size is adjusted by classification or the like to become colored powder.
[0013]
Therefore, it is possible to select and use distinguishable colors and particle sizes for the earth and sand to be improved from among the colors. For example, brown or the like is not preferable because it is similar to the color of the improved earth and sand and has no distinguishability, and is preferably selected from yellow, yellow-green, and silver as a color that provides clear distinguishability.
[0014]
As the additive for improvement used in the present invention, cement or bentonite is used according to its intended use, and the colored powder can be made into a colored additive by mixing it with a predetermined mixing ratio. When cement is used as an improvement additive, the color is white, light gray or gray, and the color powder is added to this to adjust to a specific color. The mixing ratio is within a range in which the color causes a significant difference visually, and the mixing ratio may be such that the function as the improving material is not impaired.
[0015]
By the way, the colored slag is generally provided for use as an aggregate, so that it functions as a fine aggregate of mortar, and is convenient without being discolored in an alkaline atmosphere. Since it is a material obtained by recycling, it is inexpensive.
[0016]
Even when bentonite is used as the improving additive, it is the same as that of cement, and the mixing ratio may be within a range in which the color causes a significant difference visually. However, even in the case of bentonite, the mixing ratio should be such that the function as muddy water is not impaired.
[0017]
In the reference example of the present invention, the foreign matter mixed with the earth and sand to be improved is a deformed particle different from the earth particle shape of the earth and sand, for example, a resin rod or spherical body. Naturally, these foreign matters are naturally colored differently from earth and sand, and have a size that can be easily visually recognized even during the improved construction method. Furthermore, it is more suitable that it has a specific gravity different from the specific gravity of earth and sand. The procedure and method for confirming the degree of mixing is the same as when colored powder is applied as a foreign substance.
[0018]
Further, in another reference example of the present invention, the foreign matter mixed with the improved additive is a metal particle such as iron powder, for example, by detecting the magnetic distribution of the metal particles on the surface of the improved earth and sand, It is also possible to clearly check the mixing condition. It is also easy to immediately and simply make a judgment on the mixing condition by carrying a simple magnetic measuring instrument or the like. The metal particles are not particularly limited to iron, and any metal particles can be used as long as they have the property of being magnetized. The above-mentioned various kinds of foreign matters such as colored powders, irregularly shaped particles, fluorescent foreign matters, metal particles, etc. can be used not only individually, but also can be used by constituting foreign matters having appropriate characteristics. Of course.
[0019]
Further, in one embodiment of the present invention, Ri Oh the foreign substance to be mixed with the modifying additive with metal particles such as iron powder, numerical distributive by detecting the bands magnetic distribution of the metal particles in the improved soil surface according e.g. It is also possible to clearly check the mixing condition. It is also easy to immediately and simply make a judgment on the mixing condition by carrying a simple magnetic measuring instrument or the like. The metal particles are not particularly limited to iron, and any metal particles can be used as long as they have the property of being magnetized. The above-mentioned various kinds of foreign matters such as colored powders, irregularly shaped particles, fluorescent foreign matters, metal particles, etc. can be used not only individually, but also can be used by constituting foreign matters having appropriate characteristics. Of course.
[0020]
In an embodiment of the present invention, when adding improving additive soil to be improved, you mixed calcium-based particles forming the scale by contact with water or the like in advance in the additive. As a result, the water permeability of the earth and sand to be treated can be reduced easily and reliably without any effort, and the improvement effect is exhibited in terms of both construction efficiency and cost. On the other hand, scale the formed calcium-based particles to deform to a different shape not spherical, it is possible to verify the degree of mixing of easily and stably processing degree by applying the mixed degree test method according to the above-mentioned colored powder Other .
[0021]
The actual improvement work is performed by preparing an appropriate amount of various foreign matters as described above, and then adding the foreign matters while stirring the earth and sand to be improved by an auger. For example, when the foreign substance is colored powder, the mixing degree and mixing ratio can be easily discriminated easily by visually checking the color distribution of the improved earth and sand while stirring the earth and sand. That is, if mixing is performed uniformly, the color distribution is also uniform. In the case of non-uniformity, it becomes mottled and the color distribution is unevenly distributed. Therefore, these conditions can be confirmed by visual confirmation directly at the site, and can be used as a standard for the end of the mixing operation.
[0022]
In the case described above, the mixing ratio can be visually determined based on the color tone of the additive itself and the change in the color tone after mixing. Furthermore, by keeping a photo record at this point, it can be used as subsequent material. Preferably, since the degree of mixing differs depending on the size of the earth and sand particles to be improved, if the particle size of the earth and sand is investigated in advance and the particle size of the colored powder is selected based on this result, the mixing can be performed satisfactorily. I can do it.
[0023]
In addition, since the degree of mixing varies depending on the specific gravity of the earth and sand particles to be improved, in this case, addition of a material with a low specific gravity such as foamed slag can be used to improve mixing. .
[0025]
【The invention's effect】
As is apparent from the above description, according to the method for checking the degree of mixing of earth and sand according to the present invention, the degree of mixing is visually determined on the construction site by the distribution of scales having a shape different from the shape of the soil particles. Ri also possible der be confirmed to, there is no need to resort to laborious and cost analysis. Moreover, since the whole mixed soil can be seen, the mixing degree can be accurately grasped.
[0026]
In addition, since the degree of mixing can be determined in real time on site, it can contribute to shortening the construction period. Furthermore, since the inspection is based on the appearance, taking a picture of the mixing site after work can be used for later materials.
[0027]
In addition, the water permeability of the earth and sand to be treated can be reduced easily and reliably without any trouble by mixing metal particles with rusting properties or calcium-based particles that form scales in the additive in advance. Is possible. On the other hand, the surface of the rusted metal particles is mostly red, and the calcium-based particles forming the scale are deformed into an irregular shape other than a spherical shape. The mixing degree of the stable processing degree can be easily verified.

Claims (1)

  When adding an improvement additive to the earth and sand to be improved, the water permeability of the earth and sand is reduced by mixing calcium-based particles that form scales in contact with water or the like in advance in the improvement additive. A mixing degree inspection method for earth and sand and an improved additive, wherein the degree of mixing of earth and sand and an improved additive is discriminated by visually confirming the calcium-based particles whose shape has been changed by forming.