KR101564560B1 - Eco neutral ground For improvements firming agent Production method and construction method - Google Patents

Abstract

The present invention relates to an eco-friendly firming agent for improving neutral ground, and a manufacturing and construction method of the same wherein the eco-friendly firming agent for improving neutral ground comprises: 24 to 28 kg of fly ash; 8 to 9.5 kg of bottom ash; 8 to 9.5 kg of paper ash; 8 to 9.5 kg of anhydrite; 8 to 9.5 kg of chemical gypsum; 16 to 19 kg of blast furnace slag powder; 8 to 10 kg of one or more compounds selected from ultra rapid hardening cement, alumina cement, silica fume, and quicklime; and 5 to 20 kg of one or more vegetable reinforcing agents selected from rice straws, sawdust, rice hulls, and wood pellets.

Description

Technical Field [0001] The present invention relates to a solidifying agent for improving environment-friendly neutral soil,

The present invention relates to a solidifying agent for soil improvement using a soil brick making technique, which is a traditional technique in Korea, and a manufacturing method thereof. In the case of the ground where the solidification treatment is required, there are many cases in the soft ground. For this purpose, cement and blast furnace slag cement are mainly used, and problems related to environment friendliness are being raised. Accordingly, the present invention provides an environment-friendly and soil-strengthening agent having improved tensile strength by applying application of a technique for improving environmental friendliness and tensile strength of a material using vegetable materials such as rice husks, A manufacturing method and a construction method.

In Korea, which has a small land area, many construction and civil works are being carried out by landfilling the coastal area in accordance with the increase of population and the development of industry. However, in the coastal areas of the south coast and the west coast, the sediments mainly composed of clay are distributed in a large scale, which makes it difficult to actually construct them. Also, in the clayey soft ground, many problems occur due to ground settlement.

Soft ground generally contains fine particles such as clay or silt, and most of the groundwater is high in rivers and beaches. These grounds must be improved in order to construct structures (buildings, roads, etc.) because the subsidence forces are large due to the weight and the bearing capacity is weak.

In general, the solidifying agent is solidifying the sludge containing water. The solidifying agent is used to strengthen the ground by forming a rigid hardened body which is physically and chemically stable by being injected into soft ground. In addition, the solidifying agent also serves to prevent contaminants such as heavy metals contained in water from polluting groundwater or soil, or to change the contaminants into a form difficult to elute.

In recent years, a technique for making sludge of neutral region so as to be able to utilize contaminated sludge by using a solidifying agent is continuously being developed, and a sludge made of a solidifying material having improved solidification conditions is used as a base material for road pavement, It is utilized in the suburbs, the road surface of road construction, and the land improvement agent. In addition, the solidified sludge is being applied to the construction of rivers and dams, soil dredging with high water content, and environmentally friendly packaging of India and farmland.

Recently, sludge has been solidified by using solidifying agent mainly composed of quicklime and cement, but it has been used as a landfill material for landfill. However, due to the increase of pH due to use of a strong alkali stabilizer, odor is generated and some heavy metal components are being eluted. In addition, it is necessary to secure a technology for recovering contaminated soil and solving solidification of contaminated sludge by containing heavy metals.

In the Korean Registered Patent Publication No. 1011489160000 (May 16, 2012), the soil hardening is carried out by mixing 10 to 80% by weight of the pozzolanic substance, 10 to 50% by weight of the portland cement, anhydrous gypsum, Containing 1 to 30% by weight of gypsum, 1 to 10% by weight of quicklime or slaked lime, and 1 to 10% by weight of iron oxide, and a soil treatment method using the same.

In the registered patent publication No. 1010356830000 (2011.05.12), 20 to 60 wt% of fly ash having a powder density of 8,000 cm 2 / g or more, 1 to 10 wt% of CSA having a powder density of 8,000 cm 2 / g or more, And a powder containing about 75 to 90 wt% of CSA having a powder content of 8,000 cm2 / g or more and 5 to 20 wt% of sodium carbonate (Na2CO3) having a powder content of 20 to 40 wt% 20% by weight of naphthalene-based fluidizing agent, 1% to 5% by weight of naphthalene-based fluidizing agent, and 20% by weight of cement- And a hardening treatment method for penetrating the soft ground foundation layer using the same,

In Korean Patent Registration No. 1007276540000 (2007.06.05), there are listed 52.2 to 59.8 wt% of fly ash, 33 to 39 wt% of cement, 4.5 to 5.5 wt% of muscovite, 2.7 to 3.3 wt% of anhydrous gypsum, By weight of fly ash, from 45 to 53.5% by weight of fly ash, from 33 to 39% by weight of cement, from 4.5 to 5.5% by weight of muscovite, from 2.7 to 3.3% by weight of anhydrous gypsum and from 6.3 to 7.7% , And a high fire for soft ground is described,

In the Korean Registered Patent Publication No. 1011948710000 (Oct. 19, 2012), 45 to 65% by weight of blast furnace slag fine powder, 10 to 40% by weight fly ash having a calcium oxide (CaO) content of 40% 5 to 30% by weight of a desulfurized gypsum having a content of calcium oxide (CaO) of 50% or more and a sulfur oxide content of 10% or more, and 1.5 to 10% by weight of a slaked lime of calcium sulfate having a calcium oxide (CaO) And the ground ground fire for modifying the soft ground is cured by the pozzolanic reaction and the latent hydraulic reaction by the stimulation of the sulphate, and for the soft ground improvement using the activated slag and the pozzolanic reaction Background Art [0002] A fire composition and a manufacturing method thereof are disclosed,

Korean Registered Patent Publication No. 1003143590000 (Oct. 29, 2001) discloses that a main material selected from the group consisting of dolomite, quicklime, and cement added to sludge or 1 m3 of sludge is 50 to 150 kg; Fly Ash 60% to 120% of the main material weight; Busan lime 50 ~ 150%; 10% to 30% of an additive selected from the group consisting of Na2CO3, MgSO4 and MgCO3; And 0.5-3% active agent selected from the group consisting of sulfonic acid salts, calcium chloride and activated carbon, and a method for using the fire-fighting method as a material for construction-related soil addition to sludge and sludge .

1. Korean Patent Registration No. 1011489160000 (May 16, 2012) 2. In Korean Patent Registration No. 1010356830000 (May 05, 2011) 3. Korean Patent Registration No. 1007276540000 (Jun. 2007) 4. Registered Patent Registration No. 1011948710000 (Oct. 19, 2012) 5. Domestic Patent Registration No. 1003143590000 (Oct. 29, 2001)

In the case of soil strengthening agent, not only high compressive strength like concrete is required but also improvement of adhesion between soil particles forming ground and solidification through moisture control is the key technology.

Also, it is an aim of the present invention to enable a subsequent process through a solidification treatment in a short time according to the ground condition (high water content, clay, etc.).

Especially, in case of soft soil improvement solidifying agent and soil improvement agent, it is an eco-friendly solidifying agent that emphasizes fast absorption rate rather than high strength condition and safe material from soil and water pollution. This is due to the fact that after the lapse of time, vegetable materials are fermented as a compost source of the soil, they have excellent technology for soil improvement.

In order to solve the problem in this connection,
Bottom ash 8 to 9.5kg;
Paper ash 8 ~ 9.5kg;
Anhydrous gypsum 8 ~ 9.5kg;
Chemical plaster 8 ~ 9.5kg;
Blast furnace slag powder 16 ~ 19kg;
8 to 10 kg of any one or more compounds selected from ultra fast cement, alumina cement, silica fume and quick lime;
The present invention provides an eco-friendly neutral solidifying agent for soil improvement comprising at least one selected from the group consisting of rice straw, sawdust, rice hull, wood pellets, and 5 to 20 kg of an environmentally friendly vegetable reinforcing agent. .

Most of the existing ground fire has been caused by the use of ordinary ordinary portland cement or blast furnace slag cement. However, in the future, it is necessary to develop the use area of fly ash when a large amount of fly ash occurs due to the addition of thermal power plants. In addition, the development of binders that enhance the bearing capacity of the existing ground and are not exposed to environmental pollution is the most important technology for preventing soil contamination. In the case of the present invention, all of the raw materials used for the present invention have almost no environmental pollutants In the curing process, rice husk, rice husk and so on improve the tensile force like fiber reinforcing agent of concrete. After curing, it maintains the neutralization of soil through fermentation process as a compost source in the ground.

[table. Recycling of fly ash in Korea]

Unit: 10,000 tons

division Generation Recycled amount sub Total Remicon Cement raw material Other
(Embankment etc.) Landfill, etc. 2012 860 675 (75%) 427 92 156 185

Fig. 1 pH neutral characteristic curve of soft grounding agent of the present invention
Figure 2: Reduction characteristic curve of the soft grounding agent of the present invention
FIG. 3 Analysis of use of the soil amendment agent of the present invention pH comparison chart
4 Comparing the compressive strength characteristics of the soil improvement agent of the present invention

The present invention has developed a product by analyzing the performance and economic feasibility of each material in advance and grasping the pH quality characteristics of various raw materials in advance. It is expected that the use of fly ash 24 ~ 28 kg;
Bottom ash 8 to 9.5kg;
Paper ash 8 ~ 9.5kg;
Anhydrous gypsum 8 ~ 9.5kg;
Chemical plaster 8 ~ 9.5kg;
Blast furnace slag powder 16 ~ 19kg;
8 to 10 kg of any one or more compounds selected from ultra fast cement, alumina cement, silica fume and quick lime;
And 5 to 20 kg of any one or more eco-friendly vegetable reinforcing agents selected from the group consisting of rice husks, sawdust, rice hulls, and wood pellets; and a method for producing the eco-friendly neutral solidifying agent.

Most solidifying agents use cement or blast furnace slag cement. In the case of related materials, it takes a lot of time for the plants to grow after the solidification of the soft ground due to the high alkaline pH of 12 or more.

         Table 2. PH quality characteristics of raw materials used division Alkaline material
(pH 10 or higher) Neutral material
(pH 5 to 10) Acidic material
(pH 5 or less) Raw material Bottom ash pH 11
Paper ash pH 12
Blast furnace slag fine powder pH 12
Rapid cement pH 13
Alumina cement pH 12
Quick lime pH 13 Fly ash pH 9
Chemical plaster pH 8
Anhydrous gypsum pH 8
Rehydrate pH 7
Rice hull pH 7
Sawdust, wood pellet pH 7 Silica Fume pH 2
Sodium sulfate pH 4
Ammonium sulfate pH 4
Organic acid pH 3

The present invention provides an initial moisture control function through the use of fly ash, which is a by-product of a thermal power plant, as a primary binder, through papermaking ashes for moisture control and highly reactive chemical plaster, , Cement, etc., to ensure the necessary performance as a soil stabilizer.

In the case of the DCM method for soft ground, the required strength is as low as 6 MPa for 91 days. In the case of soil exported from lagoons, it is designated as the main quality control item to lower the water content to below 50% It is preferable to use a component capable of controlling moisture possessed by materials such as paper ash and chemical plaster, which is not the center of compressive strength of cement or blast furnace slag cement, as a technology meeting various requirements.

Solidifying agent raw material
(Fly ash, bottom ash, paper ash, anhydrite, chemical gypsum, blast furnace slag, crude steel cement, alumina cement, silica fume, quicklime) + Eco-friendly plant reinforcing agent
(Straw, sawdust, chaff, wood pellets) + pH adjusting agent
(Powder: ammonium sulfate ammonium sulfate) or
(Liquid phase: organic acid)

Therefore, the need for environmentally friendly neutral ground fire is becoming more emphasized.

Especially, in case of bottom ash, it is necessary to study the use of coal as coal as coal as coal as coal as aggregate. In this study, the bottom ash was used as a by - product from dry process.

When the environmentally neutral neutralizing agent of the present invention is mixed with 1 N sodium sulfate, 1 N ammonium sulfate and 1 N organic acid to adjust the pH of the soil desired by the user,

The organic acid is one selected from the group consisting of acetic acid, citric acid, and a carboxylic acid component generated in a food processing plant, or an acidic substance having a pH of about 0.6 to about 0.8.

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

Example 1

10 kg of rice husk were put into a mixer and primary mixed at 70 ~ 120 rpm,

It is added by adding additional amount of fly ash 27kg, bottom ash 9kg, paper ash 9kg, anhydrous gypsum 9kg, chemical gypsum 9kg, fine blast furnace slag 18kg, quick-speed cement 6kg and alumina cement 3kg. Friendly neutral stiffening agent.

Example 2

And 10 kg of sawdust were put into a mixer, and the mixture was first mixed at 70 to 120 rpm,

It is added by adding additional amount of fly ash 27kg, bottom ash 9kg, paper ash 9kg, anhydrous gypsum 9kg, chemical gypsum 9kg, fine blast furnace slag 18kg, quick-speed cement 6kg and alumina cement 3kg. Friendly neutral stiffening agent.

Example 3

And 5 kg of rice husks were put into a mixer and primary mixed at 70 to 120 rpm,

    The mixture was further mixed at 70 to 120 rpm with additional load of 28 kg of fly ash, 9.5 kg of bottom ash, 9.5 kg of paper ash, 9.5 kg of anhydrous gypsum, 9.5 kg of chemical gypsum, 19 kg of blast furnace slag, 6 kg of quick- An environmentally neutral neutralizing agent for soil improvement was prepared.

Example 4

And 20 kg of rice husks were put into a mixer and primary mixed at 70 to 120 rpm,

   It is an eco-friendly material for ground improvement by adding an additional 24kg of fly ash, 8kg of bottom ash, 8kg of paper ash, 8kg of anhydrous gypsum, 8kg of chemical gypsum, 16kg of blast furnace slag, 5kg of curing speed cement and 3kg of silica fume. A neutral stiffening agent was prepared.

Example 5

The pH of the soil of the soft ground to which the environment-friendly neutral stiffening agent for improving the ground prepared in Examples 1 to 4 was to be applied was measured,

The pH of the solution was adjusted to 7 ~ 7.5 by spraying 1N sodium sulfate or ammonium sulfate, which is a liquid pH regulator, to prepare an environmentally neutral solidifying agent for soil improvement on the soft ground.

Example 6

The pH of the soil of the soft ground to which the environment-friendly neutral stiffening agent for improving the ground prepared in Examples 1 to 4 was to be applied was measured,

  The acidic material, which is a byproduct of pH 3 and containing a large amount of organic carboxylic acids, was sprayed with an atomizer to adjust pH to 7 to 7.5, and an environmentally neutral solidifying agent for soil improvement was applied to the soft ground.

Table 4 Composition and composition of each Example Composition of pH table division Rice straw
Etc FA BA restraint
Ash myriad
gypsum chemistry
gypsum SP Cement quicklime Alumina cement Silica fume final
Binder pH pH7 pH 9 pH
11 pH
12 pH8 pH8 pH
12 pH
13 pH
13 pH
12 pH2 Example 1 10 20 20 5 3 5 20 15 2 9.502 0.7 1.8 2.2 0.6 0.24 0.4 2.4 1.95 0.24 Influence factor Example 2 10 35 10 5 3 5 20 10 2 9.823 0.7 3.15 1.1 0.6 0.24 0.4 2.4 1.3 0.26 Influence factor ? Example 3 5 20 8 5 5 5 20 30 2 9.005 0.35 1.8 0.88 0.6 0.4 0.4 2.4 3.9 0.04 Influence factor

FA; Fly ash, BA; Bottom ash SP: Blast furnace slag powder

As shown in the examples, it does not affect the same ratio as the autogenous factor, which is the influence of each raw material on the pH, but it uses the lowest pH cement and quicklime, alumina cement and paper ash as little as possible And a vegetable additive such as fly ash, chemical gypsum, anhydrous gypsum, and rice gruel, which are in a neutral range, is an important technology of the present invention. In such a material, when the pH is not controlled, The present invention relates to a solidifying agent for improving environmentally neutral neutral soil and a method for producing the same, which are tailored to the characteristics of the respective raw materials according to various conditions of the ground by additionally adding powders and liquid phases such as sodium sulfate, ammonium sulfate and organic acid separately .

Experimental Example 1 Mixing and Physical Properties of Soft Ground

division soil
(Mature) Powder Sum pH
(mix) Moisture content (%) Compressive strength (MPa) Remarks Early
(Paperboard) 3 days
after 7 days 28th OPC 70 30 100 11.926 68 52 3.1 7.9 SC 70 30 100 11.563 68 55 2.1 8.6 Example 1 70 30 100 9.383 68 45 1.5 6.6 Example 2 70 30 100 9.709 68 44 0.8 6.1 Example 3 70 30 100 8.405 68 43 1.8 7.3

OPC: ordinary portland cement, SC: blast furnace slag cement,

As shown in FIG. 1, in the case of the soft ground, the pH is less than 10 and the neutral solidifying agent is in the range. As shown in FIG. 2, the compression strength is at least 6 MPa based on 91 days. Therefore, all three of the examples satisfied pH and compressive strength.

Experimental Example 2 Improvement of Soil and Formulation and Physical Properties of Yellow Loose Binder

division ocher Powder
(C) Sum W / C
(%) importance Powder figure pH
(powder) Compressive strength (MPa) 7 days 28th OPC 70 30 100 16 3.12 4200 13.125 11.6 19.5 SC 70 30 100 16 2.85 3800 12.342 9.1 16.9 Example 1 70 30 100 16 2.75 3300 9.502 5.7 10.5 Example 2 70 30 100 16 2.81 3400 9.823 1.9 8.2 Example 3 70 30 100 16 2.79 3500 9.005 6.6 12.5

OPC: ordinary portland cement, SC: blast furnace slag cement,

In the case of soil improvement, the ability to mix various soils by soil condition is important. As a result of pH measurement of the powder state in order to aim at a neutral solidifying agent, all of the examples showed pH below 10 As shown in FIG. 4, the compressive strength also shows a range of strength that can be used variously according to the use conditions, so that the product can be used in accordance with the site conditions.

Through the development of fires used for soft soil improvement, soil pavement, soil improvement, soil injection material, loam panel binder, loam mortar binder, etc., the use of fly ash and cogeneration power plant ash and chemical plaster Is expected. In addition, it is expected that technology that can prevent soil and water pollution can be secured through eco-friendly approach of industrial byproducts.

OPC: ordinary Portland cement, SC: blast furnace slag cement, SP: blast furnace slag powder, FA: fly ash, BA: bottom ash

Claims (3)

In an environmentally neutral neutralizing agent for soil improvement,
Fly ash 24 to 28 kg;
Bottom ash 8 to 9.5kg;
Paper ash 8 ~ 9.5kg;
Anhydrous gypsum 8 ~ 9.5kg;
Chemical plaster 8 ~ 9.5kg;
Blast furnace slag powder 16 ~ 19kg;
8 to 10 kg of any one or more compounds selected from ultra fast cement, alumina cement, silica fume and quick lime;
And 5 to 20 kg of any one or more eco-friendly vegetable reinforcing agents selected from the group consisting of rice husks, sawdust, rice hulls, wood pellets, and the like. A method for manufacturing an environmentally neutral neutralizing agent for soil improvement,
5 to 20 kg of any one or more eco-friendly vegetable reinforcing agents selected from rice husks, sawdust, rice hulls and wood pellets are put into a mixer and are first mixed at 70 to 120 rpm,
Fly ash 24 to 28 kg;
Bottom ash 8 to 9.5kg;
Paper ash 8 ~ 9.5kg;
Anhydrous gypsum 8 ~ 9.5kg;
Chemical plaster 8 ~ 9.5kg;
Blast furnace slag powder 16 ~ 19kg;
Wherein a solidifying agent composed of 8 to 10 kg of any one or more compounds selected from among cemented cement, alumina cement, silica fume and quicklime is further added and then mixed at 70 to 120 rpm for secondary improvement. A method for producing an environmentally neutral neutralizing agent. delete

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