KR101270020B1 - Composition for hardening the soil - Google Patents

Abstract

PURPOSE: An environmentally friendly soil hardening agent is provided to provide environmentally friendly soil by not using cement, be able to be hardened in a short time by not needing a large amount of water, and have the same or a better hardening function compared to using cement. CONSTITUTION: An environmentally friendly soil hardening agent comprises 20-50% of potassium oxide(K2O); 10-30 wt% of aluminum oxide(Al2O3); 75-90 wt% of a first composition(A) which consists of 1-10 wt% of ferric oxide (Fe2O3); 5-20 wt% of a second composition(B) which consists of a mixture of chitosan powder and used oyster shell powder and has a specific gravity of 2.82; and 0.5-5 wt% of red clay(C) which has a particle size of 0.1-50 um. The second composition comprises waste oyster shell powder of which 50-60 wt% has a particle size of 200-400 mesh; and chitosan powder of which 40-50 wt% has a molecular weight of 100,000, a particle size of 200-400 mesh, and a deacetylation degree of 95%. [Reference numerals] (AA) Stir; (BB) Harden

Description

Eco-Friendly Soil Hardener and Its Uses {COMPOSITION FOR HARDENING THE SOIL}

The present invention relates to a soil hardener which hardens and hardens so as to maintain the strength and durability of soil, and by using natural inorganic components as a main component without using cement at all, it is possible to secure the safety of the handler and to be environmentally friendly. The present invention relates to an environment-friendly soil hardener and a method of using the same, which have the advantage of exhibiting a high curing function even when applied to various types of soils.

The main ingredient of limestone, cement the formula CaCO ₃ (CaO · CO ₂₎ as, a ton of limestone is decomposed to become the cement clinker should discharge the carbon dioxide gas of 440kg, the fossil fuel in a high temperature sintering of 1,450 ℃ a large amount in use of clinker Large amounts of electrical energy made from fossil fuels are consumed in order to operate the plant for crushing.

In addition, some of the fossil fuels used in cement are dealt with as domestic waste and industrial by-products, which causes problems such as hexavalent chromium and heavy metals, which are harmful to the human body, and cause problems such as sick house syndrome and skin diseases. It is becoming.

In addition, cement is used for civil and structural structures such as roads, railroads, ports, water and sewage, which are social infrastructures, and it has a negative effect on environmental problems by destroying forests and nature from production to disposal and disrupting the habitat of animals and plants. Is going crazy.

In relation to the curing agent of the present invention, Korean Patent Laid-Open Publication No. 2003-0075045 (published September 22, 2003), 'The composition of the ground-improved solidified material of the hydrous soft soil using marine fishery waste and industrial waste' and its manufacturing method; Republic of Korea Patent Application Publication No. 10-2011-0018582 (published February 24, 2011) 'method of solidified soil brick and block using a chemical and powder solidifying agent'; Republic of Korea Patent Registration No. 10-0956593 (Registration date April 29, 2010) 'artificial soil manufacturing method obtained by solidifying organic and inorganic sludge'; 'Heavy metal-containing waste solidification treatment composition' of Korean Unexamined Patent Publication No. 1998-013753 (published May 15, 1998); Korean Patent Laid-Open Publication No. 2003-0056625 (published Jul. 04, 2003) entitled 'Bentonite waste liquid solidifying agent and its preparation method and solidification treatment method thereof'; Republic of Korea Patent Application Publication No. 10-2004-0069871 (published Aug. 6, 2004) 'the manufacturing method of fast curing solidified material and the solidification method of the soil using the same'; Republic of Korea Patent Application Publication No. 10-2007-0097811 (published October 5, 2007) 'acid-based powder solidification method and the sludge solidification method using the same'; Although a number of technologies have been disclosed, such as 'Method for producing a solidifying agent for organic / inorganic waste resources' of Korean Patent Publication No. 10-2007-0089021 (published August 30, 2007),

Although the above-described technologies are technologies related to the present invention, most of them use cement or include cement and other harmful ingredients to human body and nature, so that the environment-friendly and hardening quality required by the present invention is good. There is a problem that does not meet the purpose of providing the soil hardener.

Republic of Korea Patent Publication 2003-0075045 (published September 22, 2003) Republic of Korea Patent Publication No. 10-2011-0018582 (published February 24, 2011) Republic of Korea Patent Registration 10-0956593 (Registration date April 29, 2010) Republic of Korea Patent Publication No. 1998-013753 (published May 15, 1998) Republic of Korea Patent Publication No. 2003-0056625 (published July 4, 2003) Republic of Korea Patent Publication No. 10-2004-0069871 (published August 6, 2004) Republic of Korea Patent Publication No. 10-2007-0097811 (published October 5, 2007) Republic of Korea Patent Publication No. 10-2007-0089021 (published August 30, 2007)

In order to solve the above problems, since the present invention does not use cement, it is environmentally friendly and does not require a large amount of water, such as a cement-containing hardener, so that curing can be performed in a short time, and the same as using cement. It is an object of the present invention to provide an environment-friendly soil hardener and a method of using the same that may have a hardening function.

In order to achieve the above object,

The present invention is 20 to 50wt% of potassium oxide (K ₂ O), 10 to 30wt% of aluminum oxide (Al ₂ O ₃ ), 20 to 50wt% of silicon dioxide (SiO ₂ ), iron oxide (Fe ₂ O ₃ ) 1 75 to 90 wt% of the first composition (A) formed by mixing of 10 wt%; and

5-20 wt% of the second composition (B) formed by mixing 50-60 wt% of the waste oyster shell powder and 40-50 wt% of the chitosan powder;

Technology composition for eco-friendly soil hardener composed of a mixture (A + B + C) of 0.5 ~ 5wt% of ocher (C) with specific gravity 2.82, particle size (μm) of 0.1 ~ 50,

Technical composition of the method of using the soil hardener to harden the soil by adding 1 to 5 wt% of water and 5 to 20 wt% of the soil hardener based on the total weight of the soil is the main technique.

The eco-friendly soil hardener according to the present invention has no advantage of using cement and has a natural mineral material as a main component, thus ensuring safety in use and having an environment-friendly environment.

And since it does not use cement, it does not need much water to fluidize the soil, and it has the advantage that it can be cured in a short time because it can be cured even with a small amount of water.

In addition, since the hardening effect is the same as or more than when using the cement it can be applied to various types of soil (Soil) has the advantage of high usability.

1 is a photograph showing a molded article manufacturing process using an environment-friendly soil hardener according to the present invention.

Hereinafter, look at the specific technical configuration of the eco-friendly soil hardener according to the present invention.

The eco-friendly soil hardener according to the present invention can be used as a soil hardener with only the composition shown in the first composition, but in order to further strengthen the curing function, the eco-friendly soil hardener according to the present invention is formed by using the second composition and loess together. .

The potassium oxide (K ₂ O) is a potassium potassium nitrate and heated in a vacuum (2KNO ₃ + 10K → 6K ₂ O + N ₂ ), a colorless crystal obtained by removing potassium after heating in a vacuum with a small amount of air and potassium.

Inverse fluorite structure, with a constant constant α = 6.45Å and bond length K-O of 2.79Å. It is a white powder with a specific gravity of 2.32 and a molecular weight of 94.20 and has hygroscopicity. In addition, when severely reacted with water, it turns into potassium hydroxide.

Such potassium oxide (K ₂ O) is used in the natural inorganic curing agent of the present invention has a function to improve the cohesion, when the amount is less than 20wt% or more than 50wt%, cohesive force is insufficient, rapid curing treatment It is preferable to limit the amount of the potassium oxide (K ₂ O) used in the range of 20 to 50 wt% with respect to the total weight of the first composition because of the problem that it is difficult.

The aluminum oxide (Al ₂ O ₃ ) is a material made by reacting with oxygen when aluminum is exposed to air, and is commonly referred to as aluminum oxide (alumina). It is odorless and has a molecular weight of 101.96 and a specific gravity (water = 1) of 3.965 (at 5 ° C.) as the physical state of crystals or powders is maintained.

Such aluminum oxide (Al ₂ O ₃ ) is used in the natural inorganic curing agent of the present invention has a function to improve the cohesion, when the amount is less than 10wt% or more than 30wt% cohesion is insufficient. Since there is a problem that rapid curing treatment is difficult, it is preferable to limit the amount of the aluminum oxide (Al ₂ O ₃ ) to be in the range of 10 to 30 wt% based on the total weight of the first composition.

The silicon dioxide is a generic term for quartz yarns having a high content of SiO _{2 as} a main component, and in KS, silica ₂ content is 70 wt% or more and clay powder is less than 2 wt%. The general physical properties of silicon dioxide are assembling hardness 7, specific gravity 2.65 ~ 2.66, melting temperature (℃) 1,713.

Silicon dioxide varies its use depending on the particle size, in the case of 5 ~ 8 mesh, main sand (back sand), water purification plant filter sand; In case of 8 ~ 12mesh, for construction materials such as non-slip, sending yarn; In the case of 12-18 mesh, for construction materials, such as water purification filtration yarn, color hardener, and sending yarn; For 20 ~ 40 mehs, main instructor, golf course bunker, pesticide, water purification filter tile, mortar cement, color hardner, traditional brick; 40 ~ 70mesh, for building materials such as cast steel, tile, mortar cement; 70 ~ 200mesh, for cast steel, tiles, mortar cement, waterproof mortar building materials; For 100 ~ 200mesh, for main instructor and cortisend; When passing through 200mesh more than 75 ~ 90%, apply it to ocher room, ocher mortar, high strength pile, lightweight foam concrete, insulation insulation, concrete, mortar, and use it differently.

The silicon dioxide is used in the natural inorganic curing agent of the present invention has a function to improve the cohesion, when the amount of use is less than 20wt% or more than 50wt%, the cohesive force is insufficient, the problem that the rapid curing treatment is difficult Since the amount of the silicon dioxide (SiO ₂ ) is preferably in the range of 20 to 50wt% based on the total weight of the first composition.

The iron oxide (Fe ₂ O ₃ ) is Fe ₂ O ₃ (Hematite) and Fe ₃ O ₄ (Magnetite) that is naturally present in the form of iron ore and FeO (Wustite) appearing in the reduction process.

The Fe ₂ O ₃ (Hematite) is approximately 70% iron and 30% oxygen, the color varies from red to black, strong gray and the like. Specific gravity is 4.9 ~ 5.3 and is the highest oxidation state of iron. Hematite is crystallized in a corundum rhombohderal system. The unit cell contains 18 oxygens arranged in a closed-packed oxygen lattice and 12 ferrous ions occupying 2/3 of the octahedral site.

Such iron oxide (Fe ₂ O ₃ ) is used in the environment-friendly soil hardener of the present invention has a function to improve the cohesion, when the amount of use is less than 1wt% or more than 10wt% insufficient cohesive force is rapid curing because there is a problem that processing becomes difficult, the amount of the iron oxide (Fe ₂ O ₃₎ is preferably limited within the range of 1 ~ 10wt% for the total weight of the first composition.

The first composition is formed by mixing the above potassium oxide (K ₂ O), aluminum oxide (Al ₂ O ₃ ), silicon dioxide (SiO ₂ ), and iron oxide (Fe ₂ O ₃ ), and the first composition An example of the composition is as in Example 1 below.

Specific compositions of the first composition include 30 kg of potassium oxide (K ₂ O), 30 kg of aluminum oxide (Al ₂ O ₃ ), 30 kg of silicon dioxide (SiO ₂ ), and 10 kg of iron oxide (Fe ₂ O ₃ ). To mix.

Next, the contents of the waste oyster shell powder and chitosan powder constituting the second composition will be examined.

The waste oyster shell powder constituting the second composition is used by pulverizing the discarded waste oyster shell, and when looking at the manufacturing process, the waste oyster shell collected first is first washed with water, and the salts and organic matter buried in the waste oyster shell Will be removed.

After washing the water, the surface of the waste oyster shell is washed again using a brush.

After the washing process, the waste oyster shell is put in a water bath and heated for 24 hours, and then dried in an oven, which is dried in an oven for 1 to 2 hours at 100 to 120 ° C., more specifically, 110 It is dried for 2 hours at ℃.

The dried oyster shell after the drying process is subjected to a calcination process, wherein the calcination is performed at an electric furnace at a temperature of 900 to 1,000 ° C. for 1 to 2 hours, and more specifically, to be baked at 900 ° C. for 2 hours.

Then, after firing, the waste oyster shell is pulverized to 200 to 400mesh using a ball mill to prepare the waste oyster shell powder used in the present invention.

When the amount of the waste oyster shell powder is less than 50wt% or exceeds 60wt%, it is difficult to expect an increase in the curing rate of the curing agent of the present invention, so the amount of the waste oyster shell powder is used in the total weight of the second composition. It is preferable to limit the amount within the range of 50 to 60 wt%.

The chitosan powder is a 200-400 mesh powder having a molecular weight of 100,000 and a deacetylation degree of 95%, and when the amount thereof is less than 40 wt% or exceeds 50 wt%, it is difficult to expect an increase in the curing rate of the curing agent of the present invention. Therefore, the amount of the chitosan powder used is preferably limited to the range of 40 to 50wt% based on the total weight of the second composition.

The second composition is formed by mixing the waste oyster shell powder and the chitosan powder. The composition of the second composition is the same as in Example 2 below.

A specific composition example of the second composition is composed of 5 kg of waste oyster shell powder and 5 kg of chitosan powder.

Next, we will look into the content of ocher among the components of eco-friendly soil hardener.

In the mineral composition of the loess, it contains 60 to 70% of quartz and its content varies from as low as 40% to as high as 80%. Feldspar and mica account for 10-20% and carbonate minerals 5-35%. About 2-5% of the remainder consists of minerals such as hornblende, apatite, biotite, chlorite, cyanite, garnet, halo, fluorite, rutile, quartzite, tourmaline and zircon, and the particles are typically mildly weathered. In the fine grain size (less than 0.002mm), clay minerals such as montmorillonite, illite, kaolinite, etc., account for the most part.

The loess may use natural loess as it is, but the kaolin mineral is heated and dehydrated through the calcining process to change to meta-kaolin state and exhibit strong reactivity. The ocher is calcined ocher by calcining at 500 ~ 950 ℃ for 1 hour to 1 hour 30 minutes, when lime is added to the calcined ocher to produce afwilite (3CaO · SiO ₂ · 3H ₂ O) which is the final hydrate. do.

At this time, if the firing temperature of the loess is more than 950 ℃ pozzolanicity is lost, the baking temperature of the loess is preferably limited to within the range of 500 ~ 950 ℃.

The pozzolanic is not a hardening property by itself, but is a substance that forms a compound having insoluble hydraulic properties by slowly combining with Ca (OH) ₂ , which is produced in large amounts when the clinker component is hydrated in the presence of H ₂ O. It is based on the main component. In this case, the action of increasing strength by combining with Ca (OH) ₂ and curing with the presence of H ₂ O is called a pozzolanic reaction.

And when the amount of the loess is less than 0.5wt%, it is difficult to expect to shorten the curing time according to the use of the loess or to improve the compressive strength of the produced cured body, the amount of the loess is 0.5 ~ the total amount of the environmentally friendly soil hardener It is preferable to limit the amount to 5 wt%.

Next, let's look at the use of environmentally friendly soil hardener according to the present invention.

Conventional cement hardeners had to add a large amount of water to the excavated soil in order to fluidize the excavated soil, so it was difficult to obtain strength to withstand the pavement in a short time, but in the case of the soil hardener according to the present invention, no cement was used. It does not require a large amount of water for curing.

More specifically, the soil is cured by adding 1 to 5 wt% of water and 5 to 20 wt% of the soil hardener to 79 to 94 wt% of the soil.

The amount of water used varies depending on the water content of the soil, but if it exceeds 5wt%, there is a problem that it takes a long time to cure, so the amount of water used is preferably limited within the range of 1 to 5wt% based on the total weight of the soil. Do.

In addition, when the amount of the soil hardener is less than 5wt%, there occurs a problem such as delay in curing time. When the amount of the soil hardener is exceeded 20wt%, there is no significant change in the curing quality. It is preferable to limit in the range of 5-20 wt% with respect to weight.

For example, in order to solidify the excavated soil generated by the excavation, 3 kg of water and 12 kg of soil hardener are added to 85 kg of the excavated soil.

In addition, the fluid obtained by adding and kneading water and soil hardener to the excavated soil may be buried again in the excavated land, used as a gap filling material between blocks or blocks, or put into a predetermined mold and then used as a block.

In addition, by adding the soil hardener according to the present invention to the high water content of mud generated in the civil engineering site, it is possible to modify and harden as it is without dehydration.

As described above, since the natural inorganic hardener according to the present invention does not contain cement, there is no fear of soil contamination even when used in river banks, acid banks, and sediments, and does not require much water for fluidization. Therefore, it is possible to cure in a short time can have a shortening effect of the curing time, and also because of the high curing quality, the industrial applicability is large.

Claims (5)

20-50 wt% of potassium oxide (K ₂ O), 10-30 wt% of aluminum oxide (Al ₂ O ₃ ), 20-50 wt% of silicon dioxide (SiO ₂ ), 1-10 wt% of iron oxide (Fe ₂ O ₃ ) 75 to 90 wt% of the first composition (A) formed by mixing;
5-20 wt% of the second composition (B) formed by mixing the waste oyster shell powder and the chitosan powder;
In the composition (A + B + C) of specific gravity 2.82, 0.5 ~ 5wt% ocher (C) having a particle size (㎛) 0.1-50,
The second composition (B) after washing the collected waste oyster shell to remove salt and organic foreign matter, dried for 1 to 2 hours at 100 ~ 120 ℃ and then fired for 1 to 2 hours at 900 ~ 1,000 ℃, and fired 50 ~ 60wt% of the waste oyster shell powder crushed the waste oyster shell into 200 ~ 400mesh using a ball mill,
Eco-friendly soil hardener, characterized in that the composition is composed of a mixture of 40 to 50wt% of 200 ~ 400mesh chitosan powder having a molecular weight of 100,000, 95% deacetylation.




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