KR100857916B1 - Solidifying agent and method for solidfying soft ground using it - Google Patents

Abstract

A soil hardening material is provided to reduce mechanical load and to have excellent workability by having excellent mobility, soil mix property and compressive strength. A soil hardening material comprises 10~90 weight percent pozzolane materials, 5~50 weight percent portland cement, 1~50 weight percent anhydrous gypsum, 1~10 weight percent calcium sulfonate based compound, 0.01~5 weight alcohol or alkanolamine compound, that is, surface tension reduction materials for reducing the viscosity of pozzolane materials, 0.1~10 weight percent compound for increasing strength, and 0.01~5 weight percent superplasticizer for increasing the mix property of soil and hardening material.

Description

Soil solidifying material and soft ground treatment method using it {Solidifying agent and method for solidfying soft ground using it}

The present invention relates to a soil solidified material and a soft ground treatment method using the same, and more particularly, the soil solidified material having excellent workability for reducing mechanical load due to excellent fluidity and mixing with soil, and soft ground treated using the same. It is about public law.

Conventionally, Portland cement or slag cement is mainly used for the solidification of soil, but Portland cement or slag cement has a problem of using a large amount to obtain a target compressive strength when mixed with soil.

In order to solve this problem, recently, a solidified material manufacturing technique using blast furnace slag fine powder, anhydrous gypsum, or an alkali metal salt compound is used, but when they are mixed with soil, the fluidity sharply decreases and the mechanical load increases during construction. I have a problem.

In addition, in order to improve fluidity, the amount of use (W / C) needs to be increased. In this case, the compressive strength is lowered, thereby causing a new problem of increasing the amount of solidified fire.

Therefore, the problem to be solved by the present invention is to provide a soil solidified material having excellent fluidity and mixing with soil, excellent compressive strength to reduce the mechanical load and excellent workability, and also soft ground treatment using such soil solidified material It is to provide a method.

In order to achieve the above problems, the present invention,

10 to 90 weight percent pozzolanic material;

5-50% by weight of portland cement;

Anhydrous gypsum 1-50% by weight;

1-10% by weight of calcium sulfonate compound;

0.01 to 5% by weight of an alcohol or an alkanolamine compound which is a surface tension reducing agent for reducing the viscosity of the pozzolanic material;

0.1 to 10% by weight of a compound for enhancing strength; And

It provides a soil solidified material and a soft ground treatment method using the same, characterized in that it comprises 0.01 to 5% by weight of a fluidizing agent to improve the mixing properties of the soil and solidified material.

In the soil solidified material and the soft ground treatment method using the same, the pozzolanic material is any one or more selected from the group consisting of blast furnace slag powder, fly ash, paper ash and silica fume, the viscosity of the pozzolanic material Alcohol compounds, which are surface tension reducing agents, are ethylene glycol, diethylene glycol, polyethylene glycol, polypropylene glycol, polyethylene propylene glycol, polybutylene glycol, polypropylene butylene glycol, methoxy polyethylene glycol, and methoxy polyethylene ethylene glycol. At least one selected from the group consisting of, the alkanolamine compound is preferably at least one selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine and triisopropanolamine.

In the soil solidified material and the soft ground treatment method using the same, the strength enhancing compound is any one or more selected from the group consisting of sulfates, phosphates, sodium aluminate compounds and alkali metal salt compounds, the sodium When using a mixture of an aluminate compound and an alkali metal salt as a compound for enhancing strength, the mixing weight ratio thereof is preferably 0.05 to 1.

In the soil solidified material and the soft ground treatment method using the same, the fluidizing agent is any one or more selected from the group consisting of lignin-based compounds, naphthalene-based compounds, melamine-based compounds and polycarboxylic acid-based compounds, It is preferable that the weight ratio of the mixture of the sodium aluminate-based compound for strength enhancement and the alkali metal salt to the fluidizing agent is 0.1 to 5.

The present invention as described above has the advantage of providing a soil solidified material having excellent fluidity and mixing with the soil, excellent compressive strength and the use of such solidified material reduces the mechanical load and greatly improves workability and solidified material By reducing the amount of use or greatly reducing the number of improvements, it is possible to provide an eco-friendly soft ground treatment method that reduces the amount of cement.

Hereinafter, concrete details for the implementation of the soil solidification material and the soft ground treatment method using the same will be described.

Soil solidifying material according to the invention is 10 to 90% by weight pozzolanic material; 5-50% by weight of portland cement; Anhydrous gypsum 1-50% by weight; 1-10% by weight of calcium sulfonate compound; 0.01 to 5% by weight of an alcohol or an alkanolamine compound which is a surface tension reducing agent for reducing the viscosity of the pozzolanic material; 0.1 to 10% by weight of a compound for enhancing strength; And 0.01 to 5% by weight of a fluidizing agent to improve the mixing of the soil and solidified material,

The soil solidifying material according to the present invention as described above is characterized by excellent fluidity and mixing with the soil, which is an alcohol or alkanolamine compound which is a surface tension reducing agent to reduce the viscosity of the pozzolanic material, mixtures for enhancing strength and soil It will be described in detail as it is expressed by the use of a glidant to enhance the mixing properties of the solidified with.

Alcohol compounds in the surface tension reducing agent for reducing the viscosity of the pozzolanic substance include ethylene glycol, diethylene glycol, polyethylene glycol, polypropylene glycol, polyethylene propylene glycol, polybutylene glycol, polypropylene butylene glycol, methoxy polyethylene glycol And methoxy polyethylene propylene glycol, and the like, and alkanolamine compounds include monoethanolamine, diethanolamine, triethanolamine, and triisopropanolamine.

Among the above-mentioned alcohols or alkanolamine compounds, diethylene glycol, polyethylene glycol or triisopropanol amine are the most effective in reducing the viscosity of the whale chain slag fine powder.

The amount of the alcohol or alkanolamine compound, which is the surface tension reducing agent, is suitably 0.01 to 5% by weight of the pozzolanic material, and may be in a liquid or powder form. If the amount used is 0.01% by weight or less, the effect of reducing the surface tension is insufficient, and at 5% by weight or more, there is no synergistic effect of the reduction of the surface tension.

In addition, the pozzolanic material may be used without particular limitation as long as it is widely known in the art to which the present invention pertains, and according to various tests of the present inventors, any one or more selected from the group consisting of blast furnace chain slag powder, fly ash, paper ash and silica fume It is preferable.

The early strength and long-term strength-promoting compounds include sulfate, phosphate, sodium aluminate compounds and alkali metal salt-based compounds, but in order to prevent degradation of fluidity while improving early strength and long-term strength as in the present invention, sodium aluminate It is preferable to mix and use a system compound (A) and an alkali metal salt compound (B) in an appropriate ratio.

In addition, the use weight ratio of the A / B is 0.05 ~ 1 is suitable, and less than 0.05 early strength increase rate is not efficient work during construction, at 1 or more, the early strength increase effect is large, but the fluidity is large, the machine during construction There is a problem that the workability is poor due to heavy load.

And the total amount of the strength enhancing compound is suitable for 0.1 to 10% by weight. If 0.1 wt% or less is used, the strength increase rate is insufficient, and if 10 wt% or more is used, the fluidity is significantly reduced.

In addition, compounds that promote the mixing and fluidity of the soil and solidified materials include lignin-based compounds, naphthalene-based compounds, melamine-based compounds, and polycarboxylic acid-based compounds. Any of the above fluidizing agents are possible to minimize the ratio W / C, but it is very important to use an appropriate amount. Therefore, in order to increase the strength and prevent the initial fluidity from being lowered, the ratio of the ratio of the sodium aluminate-based compound and the alkali metal salt compound (A / B), which is a strength-improving compound, to the fluidizing agent (C), which is a fluidity improving agent (A +) B) / C is suitable for 0.1 to 5. If it is less than 0.1, the fluidity is excellent but the strength increase rate is low, and the required strength cannot be obtained. If the value is 5 or higher, the strength increase rate is high, but the fluidity is lowered, resulting in an increase in the mechanical load.

As described above, the method for treating soft ground according to the present invention is not particularly limited, and a method for reinforcing soft ground using solid materials corresponds to the soft ground treatment method of the present invention.

For example, the soft ground treatment method using the solid fire which may correspond to the present invention, by mixing the solid material in the surface layer of the soft ground and stable treatment and securing the trafficability of heavy equipment, foundation of low soil, road improvement And a deep mixing process for adding solidified materials to the distal ground and mixing them in situ to improve the soft ground in columnar, bulky or full scale.

The deep mixing process was developed by the Japan Institute of Transport, Port Research and Technology since 1976. In the mid-1970s, the deep mixing method (DLM) and slurry-based mechanical stirring mixing process (CDM) were used. It was put to practical use in the name of). In addition, Lime Column method was developed in Sweden at the same time as DLM method, and this method is used to convey solidified material to high pressure air and supply it to the ground and stir-mix it. There are many kinds of such a deep mixing treatment method by the difference between the solidified material, the method of supplying the solidified material, or the difference of the mixing method. On the other hand, unlike the mechanical mixing treatment method, the injection mixing treatment method that has developed a chemical injection method is a method that expects the mixing of the soil and the solids by the jet by rotating the injection hole while injecting the high-pressure solids.

Hereinafter, the present invention will be described in detail with reference to the following examples.

<Example: Solidified Fire Mixture and Test Results>

Solidified materials were prepared as shown in Table 1, and the results of evaluation of physical properties after mixing with soil using the solidified materials prepared in Table 1 are shown in Table 2. Soil bore and test method for physical property evaluation are as follows.

* Soil breakdown

Viscous soil: water content 85%, 1 liter weight 1700gram

-Sandy soil: 52% water content, 1 liter weight 1800gram

* Test method: uniaxial compressive strength (KSF2426), fluidity (KSL5111)

division Pozzolanic substances Portland Cement Slag cement Anhydrous gypsum Surface tension reducer Calcium Sulfonate Compound A mixture of sodium aluminate and alkali metal salt compounds Glidants Fire 1 80 8 0 5 3 2 1.5 0.5 Fire 2 80 8 0 5 0 2 1.5 0.5 Fire 3 80 8 0 5 3 2 0 0.5 Fire 4 80 8 0 5 3 2 1.5 0 Fire 5 80 8 0 5 3 2 0 0 Fire 6 0 100 0 0 0 0 0 0 Fire Fire 7 0 0 100 0 0 0 0 0

Type of solid fire used Soil type High Fire Consumption (gram / soil liter) W / C (%) Compressive strength (㎏ / ㎠) Fluidity (mm) 7 days 14 days 28 days Early 30 minutes later Fire 1 Clay soil 210 100 14.3 26.2 38.5 180 181 Sandy soil 210 100 17.7 32.5 46.3 192 191 Fire 2 Clay soil 210 100 10.3 22.7 31.8 171 169 Sandy soil 210 100 12.8 24.6 35.9 181 176 Fire 3 Clay soil 210 100 9.5 21.7 31.4 180 180 Sandy soil 210 100 12.4 25.2 35.3 191 192 Fire 4 Clay soil 210 100 14.1 23.3 31.6 175 164 Sandy soil 210 100 16.5 25.8 35.0 178 168 Fire 5 Clay soil 210 100 9.2 16.7 26.8 167 162 Sandy soil 210 100 11.2 19.0 30.2 177 170 Fire 6 Clay soil 210 100 3.3 9.5 16.6 158 149 Sandy soil 210 100 5.4 11.7 19.1 169 160 Fire 6 Clay soil 300 100 14.0 25.3 36.9 175 164 Sandy soil 300 100 16.7 30.9 43.0 188 172 Fire Fire 7 Clay soil 210 100 5.5 11.2 18.7 160 151 Sandy soil 210 100 6.9 17.5 20.2 169 160 Fire Fire 7 Clay soil 300 100 13.9 30.8 37.2 173 161 Sandy soil 300 100 16.5 36.0 44.2 177 168

As shown in Table 2, the solidified material according to the present invention was confirmed to have excellent physical properties such as compressive strength and flowability.

Claims (5)

10 to 90 weight percent pozzolanic material; 5-50% by weight of portland cement; Anhydrous gypsum 1-50% by weight; 1-10% by weight of calcium sulfonate compound; 0.01 to 5% by weight of an alcohol or an alkanolamine compound which is a surface tension reducing agent for reducing the viscosity of the pozzolanic material; 0.1 to 10% by weight of a compound for enhancing strength; And Soil solidified material, characterized in that it comprises 0.01 to 5% by weight of a fluidizing agent to improve the mixing properties of the soil and solidified material. According to claim 1, wherein the pozzolanic material is at least one selected from the group consisting of blast furnace slag powder, fly ash, paper ash and silica fume, the alcohol compound is a surface tension reducing agent for reducing the viscosity of the pozzolanic material is ethylene glycol , Diethylene glycol, polyethylene glycol, polypropylene glycol, polyethylene propylene glycol, polybutylene glycol, polypropylene butylene glycol, methoxy polyethylene glycol and methoxy polyethylene propylene glycol, any one or more selected from the above-mentioned alkanes The olamine compound is soil solidified material, characterized in that any one or more selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine and triisopropanolamine. The method of claim 1, wherein the strength enhancing compound is at least one selected from the group consisting of sulfates, phosphates, sodium aluminate compounds, and alkali metal salt compounds, and a mixture of sodium aluminate compounds and alkali metal salts is enhanced in strength. When used as a compound for the soil solidified material, characterized in that the mixing weight ratio of 0.05 to 1. According to claim 3, wherein the fluidizing agent is any one or more selected from the group consisting of lignin-based compounds, naphthalene-based compounds, melamine-based compounds and polycarboxylic acid-based compounds, mixtures of sodium aluminate-based compounds and alkali metal salts for strength enhancement Soil solidified material, characterized in that the weight ratio of 0.1 to 5. In the soft ground treatment method for strengthening the soft ground by excavating and mixing the soil and solid fire of the soft ground, The solidified fire 10 to 90 weight percent pozzolanic material; 5-50% by weight of portland cement; Anhydrous gypsum 1-50% by weight; 1-10% by weight of calcium sulfonate compound; 0.01 to 5% by weight of an alcohol or an alkanolamine compound which is a surface tension reducing agent for reducing the viscosity of the pozzolanic material; 0.1 to 10% by weight of a compound for enhancing strength; And It is characterized in that it contains 0.01 ~ 5% by weight of the fluidizing agent to improve the mixing properties of the soil and solidified material, the mechanical load is reduced by the improvement of fluidity, the workability is greatly improved and the compressive strength is improved, the existing cement-based solidified material Eco-friendly soft ground treatment method that can reduce the amount of solidified fire and significantly reduce the number of improved materials.