KR20190087395A - Ground improvement material for deep sea with deep cement mixing by utilizing siliceous slag binder - Google Patents

Abstract

The present invention relates to a solidifier for a deep seawater mixing method using silica-based slag fine powder, which comprises: a stabilizer consisting of blast furnace slag and cement; and the silica-based slag fine powder. The solidifier used in the deep seawater mixing method comprises the stabilizer and the silica-based slag fine powder, and thus improves geonasty of an overlapped part during the initial construction using the solidifier, realizes the equal strength performance while lowering the price compared to a conventional solidifier during applying the same to a site in addition to the strength performance, and constitutes a composite of greater than or equal strength at 28 days of material age.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a silica-based slag fine powder,

The present invention relates to a fire-fighting method using a silica-based slag fine powder, and more particularly, to a fire-fighting method using a silica-based slag fine powder used in a deep sea mixing method.

The production of mixed concrete using industrial byproducts such as thermal power plants and steel mills has produced a lot of researches in the past, and its utilization has been gradually increasing both inside and outside of Korea by expanding its application range.

In other words, the development of various cement substitutes has become a source technology that leads to the cost reduction of existing OPC (ordinary Portland cement) or blast furnace slag cement or the development of concrete such as high performance, high durability, high strength, In addition to the development of related cement substitutes, interest in related fields has also been focused on the development of high performance admixtures and optimum substitution rate to accelerate securing required performance of cement substitutes.

Herein, typical examples of those which have been regarded as industrial wastes in the past and which are recently recognized as admixtures are blast furnace slag fine powder, fly ash, silica fume and the like.

In the case of blast furnace slag and fly ash, demand and supply of domestic products are compromised organically. In the case of silica fume, due to lack of related factories and mass production facilities, There is a problem in that the purchase cost is considerably high because it is dependent on imports and the price is high.

Korean Patent No. 10-1035876 (May 20, 2011) Korean Patent No. 10-1247707 (March 25, 2013) Korean Patent Publication No. 10-2013-0142470 (December 30, 2013)

The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a method of manufacturing a high- And to provide a fire for the deep sea mixing method using a silica-based slag fine powder capable of forming a composite having a strength equal to or higher than the strength at 28 days of age.

It is another object of the present invention to provide a fire for deep sea mixing using a silica-based slag fine powder capable of accelerating the secondary hydration reaction by densifying the pores of the cement and accelerating the potential hydraulicity.

In addition, the present invention provides independent patterns according to the required characteristics of the silica-based slag fine powder according to the substitution rate and purpose of each purpose, and improves the use thereof and improves the performance, thereby reducing the cost due to replacement of cement. It is another object of the present invention to provide a fire for deep sea mixing method using silica-based slag fine powder which can be applied to construction and various mixed concrete structures requiring high durability.

It is another object of the present invention to provide a method for the secondary water-hydration reaction of a stabilizer and a silica-based slag powder, and to provide a silica-based slag fine powder capable of improving the reaction performance, .

In order to achieve the above-mentioned object, the present invention provides a fire-fighting method for use in a deep sea mixing method, comprising: a stabilizer made of blast furnace slag and cement; And a silica-based slag fine powder.

The stabilizer of the present invention is composed of 95 to 97 parts by weight based on 100 parts by weight of the total amount, and the silica-based slag fine powder is composed of 3 to 5 parts by weight based on 100 parts by weight of the whole.

The silica-based slag according to the present invention, the fine grinding of industrial by-product of ferro nickel granulated slag of a particle size of the ferro-nickel 3,800~26,300㎠ / g and further characterized in that the content of SiO ₂ is 45-70%.

The stabilized material of the present invention reacts with water to produce a hydration product, and the resulting hydration product reacts with the clay minerals in the soil to produce a pozzolanic reaction compound. The silica-based slag powder is reacted with the resulting pozzolanic reaction compound And a second hydration reaction of a synthesis reaction and an additional iron silicate reaction is carried out to form a modified soil.

As described above, the present invention includes a stabilizer and a silica-based slag fine powder which are used in the deep sea mixing method, thereby realizing equivalent strength performance while lowering the price compared to conventional fire-fighting, It provides the effect of improving the surface roughness of the overlapped part at the time of initial fireproofing and composing the composite with equal strength at the age of 28 days.

Further, by limiting the mixing amount of the stabilizer and the silica-based slag fine powder to a predetermined weight part, it is possible to accelerate the secondary hydration reaction by accelerating the potential hydraulic stability by densifying the pores of the cement.

Further, by limiting the particle size of the silica-based slag fine powder and the content of SiO ₂ to a predetermined amount, it is possible to provide independent patterns according to the required characteristics of the silica-based slag fine powder by the substitution rate and the purposes of each purpose, It is possible to reduce the cost due to substitution of cement substitution and also to apply to concrete construction under various environmental conditions and various mixed concrete structures requiring high durability.

In addition, by forming the modified soil by performing the reaction with the stabilizer and the silica-based slag powder, the mechanism of the secondary hydration reaction to the stabilizer and the silica-based slag powder is specified and the effect of improving the reaction performance is provided do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are graphs showing the average compressive strengths according to the amount of the fire for the deep sea mixing method using the silica-based slag fine powder according to one embodiment of the present invention.
FIG. 3 is a graph showing the caustic ratios of the fire for the deep sea mixing method using the silica-based slag fine powder according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 and FIG. 2 are graphs showing average compressive strengths according to the amount of silica fines used in a deep sea mixing method using a silica-based slag fine powder according to an embodiment of the present invention. FIG. This graph is a graph showing the caustic ratios of the fire for the deep sea mixing method using the silica-based slag fine powder.

The fire-fighting for the deep sea mixing method using the silica-based slag fine powder of this embodiment is a fire which is used in the deep sea mixing method comprising the blast furnace slag and the cement stabilizer and the silica-based slag fine powder.

The stabilizer is a stabilizing member made of blast furnace slag and cement, and is composed of 95 to 97 parts by weight based on 100 parts by weight of the whole. Such a stabilizer reacts with water to generate a hydration product, It reacts with minerals to produce pozzolanic reaction compounds.

The silica-based slag fine powder is an additive having a SiO ₂ content of 45 to 70% as a by-product ferronickel slag, which is an industrial by-product of ferronickel in a particle size of 3,800 to 26,300 cm 2 / g, Preferably 3 to 5 parts by weight.

This silica-based slag powder is subjected to a synthesis reaction with a pozzolanic reaction compound produced by a stabilizer and a secondary hydration reaction of an additional iron silicate (Fe ₂ SiO ₄ ) reaction to form a modified soil.

As a by-product of the steel industry, ferronickel slag, which is a fourth material, is a by-product of ferronickel steel manufacture. Ferronickel itself is most frequently used as a main raw material for manufacturing stainless steel, and its ferronickel slag Nickel-based stainless steel is excellent in heat resistance, corrosion resistance, acid resistance, abrasion resistance, and processability, and is an environmentally friendly material harmless to the human body, and is used in kitchen utensils and kitchen utensils used in general households.

Ferronickel production The main processes are raw material disposal, drying, pre-reduction, melting reduction (electric furnace process), refining and casting processes. Finally, ferronickel containing about 20% nickel and about 80% Ferronickel slag refers to a water-based by-product that occurs during the mid-stage of the furnace process during the production of ferronickel.

Such ferronickel slag is a useful resource obtained after nickel ore or bituminous coal used as a raw material for producing ferronickel is melted at high temperature and separated from ferronickel. Ferronickel slag is an eco-friendly resource with excellent physical and chemical properties. It is used as a substitute for natural resources such as concrete aggregate, foundry sand, abrasives, and serpentine substitutes, contributing to resource and environmental conservation.

Ferronickel slag is classified as a prime sand produced by rapidly cooling molten slag by spraying water with prime stone produced by natural air cooling. In the case of prime stone, molten slag is cooled gradually by natural air cooling and is produced in gravel form. It shows excellent compaction ratio when used as aggregate for civil engineering such as embankment, roadbed, asphalt aggregate, and serpentine substitute.

Especially, in the case of prime sand, water is sprayed into molten slag to produce sand, which is superior to natural sand and can be used as concrete for sand.

In addition, the present invention shows differentiability and excellence in various indices through analysis of comparative literature with the characteristics of conventional deep sea fire and comparative literature analysis in the field where conventional ferronickel slag powder is applied, and the contents are as follows .

First, the raw material quality of the silica-based slag fine powder through the milling of the ferronickel slag is defined. Secondly, the performance test is performed in the case where the silica-based slag fine powder is used as the deep sea fire layer.

Third, in the case of the deep-seated cement, it is proved that the initial strength delay effect is resisting to the occurrence of construction joining and the interference solution to the occurrence of the overlapping zone in sudden environmental conditions such as typhoons and heavy rains, And shows the result of the superior performance test of the field stir performance effect on the portion satisfying the required design standard strength through the increase in the strength at the time of the strength.

Fourth, the data on the theoretical mechanism and the actual measurement of the secondary hydration mechanism according to the present invention are shown. Fifthly, the results of the test on the results of the sandy soil presentation mixing blend table and the test results and the caustic ratios .

Lastly, it can be expected that the life of the structure and the competitiveness with foreign countries can be improved in terms of price, strength and durability performance compared with the foreign acid by mixing silica - based slag fine powder.

This will expand the scope of application to various social infrastructures such as roads, bridges, dams, breakwaters, berths, submarine tunnels, vehicle bases, and various power station structures as well as general buildings, thereby reducing price competitiveness of existing fixed construction materials, The image as an industry is reconsidered.

First, regarding the quality of the silica-based slag fine powder through the milling of the ferronickel slag, as shown in the following Table 1, the conventional ordinary cement (OPC), ground granulated blast slag (GGBS) ), Pulverized fly ash (PFA), silica fume (SF), and other chemical components.

division CaO SiO ₂ Al ₂ O ₃ MgO OPC 61.4 20.5 6.4 3.0 GGBS 33.5 44.2 14.0 4.9 PFA 4.2 55.0 21.1 1.2 SF 0.6 96.7 0.3 0.2 Silica-based slag fine powder 2.1 62.8 1.9 24.7

Further, in the present invention, the basis of the binder as a binder is determined through the parameters of the specific surface area (powder degree: cm ² / g) of the general cement and three types of ferronickel slag (FNS (Low), FNS (Medium) and FNS The comparative evaluation of the properties is shown in Table 2.

% Powder figure
(cm < ² > / g) importance
(g / cm ³⁾ Weight loss
(%) Cl ^-
(%) Cr ⁶⁺
(mg / kg) SO ₃ OPC 3,712 3.10 2.43 0.017 7 2.23 FNS (L) 4,666 3.05 0.00 0.024 0 0.53 FNS (M) 8,600 3.02 0.00 0.020 0 0.29 FNS (H) 26,300 3.02 0.01 0.029 0 0.26

Further, in order to explain the performance verification of the silica-based slag fine powder of the present invention in the case of using as a deep sea fire layer in the sea surface, various basic physical property tests are shown as follows.

Table 3 shows the results of the basic physical property test of the on-site sandy soil.

Table 4 below shows mixing conditions.

Table 5 below shows the calculation of the amount of material for compounding.

Target classification Target Sat
Water content (%) Target soil volume
(kg / m ³ ) Binding discretion
(B) (kg / m ³ ) Usage (sea water)
(kg / m ³ ) W / B sand 30 2013 210 147 70 30 2013 230 161 70 30 2013 250 175 70 30 2013 280 196 70 30 2013 300 210 70 sand 30 2013 210 168 80 30 2013 230 184 80 30 2013 250 200 80 30 2013 280 224 80 30 2013 300 240 80

Table 6 below shows the output of each material according to the formulation table. (Specimen 5cm * 10cm, 9 pieces)

As a test example for the mixing of materials and preparation and curing of the specimens, the weighing of binders and used water was carried out using a balance capacity of 4 kg and a sensitivity of 0.01, and a weighing scale of 30 kg and a sensitivity of 1 g were used.

The sand mixed material was filled in a test mold (diameter 5 cm × height 10 cm), chopped with a compaction rod, and then the surface was smoothed and sealed with vinyl. The surface finish was capped with cement paste.

Next, the prepared specimen was cured by wet curing (20 3C, humidity 95% or higher) until a predetermined age.

Table 7 below shows the compressive average compressive strength (MPa) by age.

In addition, there is an initial strength retarding effect to resist the occurrence of construction joints against sudden environmental load when the deep fire is applied in the site of the bridge cement, and the strength at the 28 day strength point is increased, Table 7 shows the results of the performance verification of the field stirring performance effect for the portion satisfying the condition

As conventional stabilizers, two types of cement and blast furnace slag are usually used. In this early age, rapid strength development causes a risk of difficulty of superposition in actual field construction.

The purpose of applying the ground cement as above is that it is possible to perform cutting and superposing of the ground in a reliable manner even after the atmosphere and the rest by the weather or the sea and by adopting the discharge at the time of penetration, the reliability of the overlapped portion is improved, .

Therefore, the mixed cement using the silica-based slag fine powder of the present invention can increase the stability of the ground under the medium-term period due to the enhancement of the long-term strength and can improve the stability of the soil compared with general cement and improve the chemical durability The life can be improved.

In addition, as a result of indoor deep-fire cement-type deep sea fire test, the initial strength is suppressed on the 7th and 14th days, the result is obtained above the strength of 28 days, and the risk of inevitable construction The reliability of the overlapping portion can be improved and continuous construction becomes possible.

As described above, according to the present invention, since the stabilizer and the silica-based slag fine powder are used as the fire retardant used in the deep sea mixing method of the present invention, it is possible to realize the equivalent strength performance while lowering the price compared to conventional fire fighting, It provides the effect of improving the surface roughness of the overlapped part at the time of initial fireproofing and composing the composite with equal strength at the age of 28 days.

Further, by limiting the mixing amount of the stabilizer and the silica-based slag fine powder to a predetermined weight part, it is possible to accelerate the secondary hydration reaction by accelerating the potential hydraulic stability by densifying the pores of the cement.

Further, by limiting the particle size of the silica-based slag fine powder and the content of SiO ₂ to a predetermined amount, it is possible to provide independent patterns according to the required characteristics of the silica-based slag fine powder by the substitution rate and the purposes of each purpose, It is possible to reduce the cost due to substitution of cement substitution and also to apply to concrete construction under various environmental conditions and various mixed concrete structures requiring high durability.

In addition, by forming the modified soil by performing the reaction with the stabilizer and the silica-based slag powder, the mechanism of the secondary hydration reaction to the stabilizer and the silica-based slag powder is specified and the effect of improving the reaction performance is provided do.

The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Therefore, the above embodiments are merely illustrative in all respects and should not be construed as limiting.

Claims (1)

As a solid fire used in deep sea mixing method,
Stabilizers made of blast furnace slag and cement; And
Silica-based slag fine powder,
The stabilizer is composed of 95 to 97 parts by weight based on 100 parts by weight of the total amount,
The silica-based slag fine powder is composed of 3 to 5 parts by weight based on 100 parts by weight of the total amount,
The cement is made of a ground cement,
The silica-based slag fine powder, and milling the granulated industrial by-product of ferro nickel slag, ferro-nickel in a particle size of 3,800~26,300㎠ / g, and a content of 60-70% SiO _2,
The stabilizer reacts with water to produce a hydration product,
The hydration product is reacted with clay minerals in the soil to produce a pozzolanic reaction compound,
Wherein the silica-based slag fine powder is subjected to a secondary hydration reaction of the resulting pozzolanic reaction compound with a synthetic reaction and an additional iron silicate (Fe ₂ SiO ₄ ) reaction to form a modified soil, Fire - fighting for deep sea mixing method using fine powder.

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