KR100834407B1 - Soil stabilizer composite recycling waste concrete sludge and method for manufacturing thereof - Google Patents

Abstract

A preparation method of solid stabilizer composition is provided to recycle waste concrete sludge and to improve the coefficient of permeability and stability of the structure by substituting a part of solid stabilizer with calcined waste concrete sludge. A preparation method of solid stabilizer composition comprises steps of: (S100) calcining waste concrete sludge cake generated in a recycled aggregate manufacturing process in a rotary Kiln of 350-600deg.C for 15-60 minutes in order to remove absorptive water and organic material and to activate hydrated reactive material; (S200) grinding the calcined waste concrete sludge powder until the degree of particle size reaches 2,500-3,500cm^2/g; and (S300) preparing solid stabilizer composition by mixing 5-25wt% of the prepared waste concrete sludge powder, 50-90wt% of surface soil from soft ground and 5-25wt% of water. In the step (S200), 40-60% of grinding ball and 40-60% of the calcined waste concrete sludge are ground at 80-100rpm. The ground particles are classified according to particle size in classification step (S250). The excluded particles from the step (S250) are returned to step (S200). In the step (S300), the composition comprises 10-20wt% of calcined waste concrete sludge powder, 30-40wt% of Portland cement, 30-40wt% of furnace slag fine powder and 5-15wt% of calcium sulfoaluminate, in addition to 5-10wt% of gypsum or 1-10wt% of lime or a mixture consisting of 5-10wt% of gypsum and 1-10wt% of lime, with respect to 100wt% of solid stabilizer.

Description

Oil stabilizer composite recycling waste concrete sludge and method for manufacturing

1 is a flow chart showing a method for producing a solidifying agent composition using waste concrete sludge according to an embodiment of the present invention.

2 is a thermal analysis graph of the powder dried and calcined waste concrete sludge according to an embodiment of the present invention

Figure 3 is an X-ray diffraction graph of the powder dried and calcined waste concrete sludge according to an embodiment of the present invention

 <Brief description of symbols for the main parts of the drawings>

S100: calcination process S200: grinding process

S250: Classification process S300: Solidification composition manufacturing process

The present invention relates to a method for preparing a solidifying agent composition utilizing waste concrete sludge, wherein the waste concrete sludge dewatering cake is 350 to 600 ° C. as a soft ground solidification stabilizing solidifying agent composition containing waste concrete sludge generated in a circulating aggregate manufacturing process. A composition that selectively contains calcined powder and solidifying material, and manufactures solidifying agent for structural foundation improvement, river dike, and landfill stabilization, suggesting high economic and environmental contribution technology through effective recycling of waste resources. It relates to a method for producing a solidifying agent composition utilizing concrete sludge.

Based on the statistical data, construction waste, which was about 10.3 million tons in 1996, generated about 44 million tons in 2002, which is more than four times higher than the baseline, with an annual increase rate of 70.4%. Incidence rates soared from 16.3% in 1996 to 44.6% in 2002. Construction waste continues to increase and is expected to grow more rapidly over the next few decades.

In 2002, about 26.5 million tons of waste concrete was generated annually.In the process of manufacturing recycled aggregates for recycling, about 3 ~ 5% is discharged as sludge and mixed into simple landfill or recycled aggregates, thereby encroaching on land. And serious problems such as soil pollution and degradation of recycled aggregates.

The treatment of sludge involves enormous costs, which increases the manufacturing cost of recycling technology, weakening the company's competitiveness. Therefore, the recycling of waste concrete sludge requires active research and utilization to prevent environmental pollution and enhance national competitiveness through effective resources.

In general, the waste concrete sludge generated in the process of producing recycled aggregates does not exhibit strong hydration reactions such as cement, and thus, it is difficult to be simply used as a solidifying agent substitute.

Although calcium hydroxide (Ca (OH) ₂ ) contained in the sludge has been reported to be involved in the hydration of the sludge to some extent after a long period of time, there have been no cases of recycling it to a hardener or concrete.

Although waste concrete sludge shows various applications when analyzing pyrolysis, particle size, chemical composition, etc. despite low hydraulicity, it is not economically viable due to the high cost of treatment and collection transportation proposed by Korea Construction Recycling Resources Association. It is still unresolved and the scope of use is extremely limited.

However, from the environmental and economical level, waste concrete sludge is urgently required to be recycled, and thus, it was necessary to configure some of the solidifying agent composition to be replaced with waste concrete sludge.

The present invention has been made in order to solve the problems as described above, utilizing the waste concrete sludge that can replace a portion of the solidifying agent with waste concrete sludge generated in the recycle aggregate manufacturing process by solving the low hydraulic properties of the waste concrete sludge It is an object to provide a process for the preparation of one solidifying agent composition.

The present invention has an object to solve the problem that it is difficult to apply the recycling technology because the waste concrete sludge composed of various components has a high water content, so that a part of the solidifying agent can be replaced with the waste concrete sludge.

In order to achieve the above object, the present invention calcined waste concrete sludge cake generated in the circulation aggregate manufacturing process in a rotary kiln at 350 to 600 ° C. for 15 to 30 minutes to remove adsorbed moisture and organic matter, and a hydration reaction material. Calcination step of activating (S100); A pulverizing process of sintering calcined waste concrete sludge with a powder degree of 2,500 to 3,500 cm 2 / g (S200); A solidifying agent composition manufacturing process of mixing the pulverized waste concrete sludge powder, including 5 to 25 wt% of solidifying agent composition, 50 to 90 wt% of target soil of soft ground, and 5 to 25 wt% of water (S300); It provides a method for producing a solidifying agent utilizing waste concrete sludge, characterized in that it comprises, in the solidifying agent composition comprising waste concrete by such a manufacturing method, with respect to 100wt% of the solidifying agent, the calcination step (S100) and Waste concrete sludge calcined powder produced through the crushing process (S200) 10 ~ 20wt%, portant cement 20 ~ 40wt%, blast furnace slag powder 20 ~ 40wt%, calcium sulfoaluminate 5 ~ 15wt%, gypsum anhydride 5 to 10 wt%, lime 1 to 10% by weight, characterized in that, when the permeability coefficient of K × 10 ^-6 or more is required on the basis of sandy soil, bentonite 5 ~ 9wt% with respect to 100wt% of the hardening agent And, the solidifying agent required for the initial strength expression is characterized in that it further comprises 0.1 ~ 0.5 wt% of the accelerator (Accelerator) with respect to 100wt% of the solidifying agent, the reaction promoter is characterized in that tartaric acid (Tartaric acid) Waste cone Is a solidifying agent composition utilizing sludge agent is provided.

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

The terms or words used in the present specification and claims should not be interpreted as being limited to the ordinary or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best explain the invention of their own. Based on the principle, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

The present invention provides a powder composition in which a part of the solidifying agent is replaced with waste concrete sludge generated in a circulating aggregate manufacturing process, and a manufacturing process thereof.

The solidifying agent in the present invention is composed of a combination of waste concrete calcined powder, fork cement, blast furnace slag fine powder, calcium sulfoaluminate, anhydrous gypsum or lime, and the most preferable weight ratio is as follows.

With respect to 100% by weight of solidifying agent, 10 ~ 20wt% of waste concrete sludge calcined powder, 20 ~ 40wt% of Portland cement, 20 ~ 40wt% of blast furnace slag powder, 5 ~ 15wt% of calcium sulfoaluminate, Gypsum 5 Consisting of ~ 10wt%, waste concrete sludge calcined powder 10 ~ 20wt%, portant cement 20 ~ 40wt%, blast furnace slag powder 20 ~ 40wt%, calcium sulfoaluminate 5 ~ 15wt%, lime 1 ~ 10wt% Containing or waste concrete sludge calcined powder 10 ~ 20wt%, Portland cement 20 ~ 40wt%, Blast furnace slag powder 20 ~ 40wt%, Calcium sulfoaluminate 5 ~ 15wt%, Gypsum 5 ~ 10wt % And lime 1-10 wt% are combined.

The solidifying agent is a K × 10 by sand standard ^- if the request is ⁶ or more permeability and further comprising a Bentonite 5 ~ 10wt% with respect to 100 parts by weight of the solidifying agent of the aforementioned composition.

In the solidifying agent, when the initial strength expression is required, 0.1 to 0.5 wt% of an accelerator is further included with respect to 100 parts by weight of the aforementioned solidifying agent. In this case, it is preferable to use tartaric acid.

Waste concrete sludge is composed of various components and has high water content, which makes it difficult to apply recycling technology.

However, with the proper physical treatment, some of the solidifying agent can be replaced by waste concrete sludge.

In order to replace a part of the solidifying agent with the waste concrete sludge, the physical treatment process is preferably calcining and grinding.

At this time, in the calcination process, the waste concrete sludge dewatering cake is calcined in a rotary kiln at 350 to 600 ° C. for 15 to 30 minutes to remove adsorbed moisture and organic matter, and to activate the hydration reaction material.

The waste concrete sludge dewatering cake is used to have a water content of about 30 to 50%, and in general, a filter press type dehydration process applied by a recycling aggregate recycling company is used.

On the other hand, the grinding step is preferably to use a variety of grinding methods to the powder particle size in the range of 2,500 ~ 3,500 cm 2 / g, the higher the powder particle size is advantageous to improve the performance of the solidifying agent.

The above-mentioned solidifying agent composition is in a powder state, but when actually used, it is used in a state in which a target soil and water are mixed. Specifically, in the present invention, 5 to 25 wt% of the solidifying agent composition having the above-mentioned composition; It is to provide a solidifying agent composition comprising 50 to 90wt% of the target soil of the soft ground and 5 to 25wt% of water.

Here, the target soil is preferably a soft ground composed of granulated soil series.

The materials used in the present invention are described below.

The waste concrete sludge was used to remove the water in the filter press to occur in the circulating aggregate manufacturing process in G company Gimhae region.

Portland cement used in the present invention used was produced by the domestic T company and its physical properties are shown in Table 1 below.

Powder level (㎠ / g) Stability (%) Setting time Compressive strength (㎏f / ㎠) Gilmore Exam Vika Test Compressive strength (㎏f / ㎠) First (min) Termination (time) First (min) Termination (min) 3 days 7 days 28 days 2,800 or more 0.8 or less 60 or more below 10 45 or more 375 or less More than 130 More than 200 290 or more Magnesium Oxide (MgO) (%) Trioxide (SO3) Ignition loss (%) C3A 8% or less C3A greater than 8% 5.0 or less 3.0 or less 3.5 or less 3.0 or less

The blast furnace slag powder used in the present invention used was produced by the domestic company C and its physical properties are shown in Table 2 below.

Sulfuric anhydride (SO ₃ ) (%) Ignition loss (%) Sulfur (S) (%) Powder level (㎠ / g) 3.0 or less 1.0 or less 2.0 or less More than 8,000

Calcium sulfoaluminate used in the present invention was produced by the domestic G company and its physical properties are shown in Table 3 below.

Setting time Compressive strength (㎏f / ㎠) Ignition loss (%) Powder level (㎠ / g) First (min) Termination (time) 3 days 7 days 28 days After 60 Within 10 6.9 or higher 14.7 or more 29.4 or more 3.0 or less More than 2,000

Anhydrous gypsum used in the present invention used was produced by the domestic company C and its physical properties are shown in Table 4.

color Solubility (water 18.15 ℃) Chemical composition (%) Chemical moisture SO ₃ CaO CaSO ₄ CaF ₂  White 0.209 0.5 or less 52 or more 38 or more over 90 3 or less

Lime used in the present invention used was produced by the domestic W company and its physical properties are shown in Table 5 below.

color importance Hardness pH Specific heat (cal / g ℃) White 3.0 ~ 3.4 2.0 ~ 3.0 12.5 0.17-0.22

Bentonite used in the present invention was produced by the domestic company W and its physical properties are shown in Table 6 below.

pH Swelling degree (ml / g) importance Refractoriness Cation exchange capacity (me / 100g) 8-10.5 5-15 2.5-2.6 SK3 ~ 8 0.17-0.22

In a second aspect of the invention, a method of making a solidifying agent composition is provided.

(a) calcination step (S100) which is a step of calcining (Calcine) to replace the waste concrete sludge as part of the solidifying agent; (b) a grinding step (S200) which is a grinding step for improving the hydration energy; And classification process (S250); (C) a solidifying agent composition manufacturing step (S300), which is a step of mixing the prepared waste concrete sludge powder with the materials for replacing with a solidifying agent (S300).

Here, the calcining (Calcine) temperature in the calcination step (S100) is preferably proceeds for 10 to 15 minutes at 350 ~ 600 ℃.

Preferably, in the calcination step (S100), the waste concrete sludge is dehydrated in a water content of 30 to 50% range.

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

However, embodiments of the present invention illustrated below may be modified in many different forms, and the scope of the present invention is not limited to the embodiments described below. The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

<Example>

1 is a flowchart illustrating a method for preparing a solidifying agent composition using waste concrete sludge according to an embodiment of the present invention, referring to FIG. 1, first, that is, decarbonation for activating waste concrete sludge for hydration reaction materials. The calcination to induce the reaction (Calcine) is subjected to the calcination process (S100).

Here, the waste concrete sludge uses aggregates and cement hydrates contained in concrete. That is, the waste concrete sludge of the present invention has as few impurities as possible in the construction waste, and in particular, the more residual material of cement hydrate including calcium hydroxide (Ca (OH) ₂ ), which is a hydration reaction material, exhibits excellent characteristics.

In addition, the chemical composition of the waste concrete sludge used in the embodiment of the present invention is shown in Table 7.

ingredient SiO ₂ Al2O ₃ CaO Fe2O ₃ K ₂ O MgO Na ₂ O P ₂ O ₅ TiO ₂ SO ₃ % 48.30 13.82 24.97 4.34 1.99 2.51 1.31 0.18 0.53 1.51

It is inferred that SiO ₂ was not only crushed from the fine aggregate sand, but also a large amount of abraded and mixed in gravel. In this way, it is necessary to confirm the experiment through the thermal analysis to determine whether the sludge containing a small amount of cement paste and containing a large amount of aluminum silicate would be advantageous for the synthesis of a solidifying agent in which re-hydration is imparted by the pozzolan reaction by heat treatment. Regardless of whether or not it is caused, the sum of SiO ₂ and Al ₂ O ₃ is 62 to 78%, and when the hydrothermal minerals are synthesized through heat treatment, the basicity is largely insufficient, and thus, a significant amount of CaO component must be added. .

In addition, the thermal analysis pattern of the waste concrete sludge used in the embodiment of the present invention is shown in FIG.

The amount of crystallized water dehydrated around 700 ° C was about 1% in all samples, which is very small compared to the total loss, and most of the loss occurred before the temperature reached 600 ° C. If the loss of such low temperature portion is caused by the combustion of organic material, an exothermic reaction should appear on the DTA curve, but it is interpreted that it is due to the dehydration of weak compound water contained in the amorphous phase (gel phase or tentative phase).

It is suggested that the waste concrete sludge contains a large amount of amorphous hydrous minerals, which is a very encouraging result in the preparation of hardeners using them because it is a very favorable material state for activation through pyrolysis or low temperature synthesis of hydraulic minerals. It is feed.

In addition, the X-ray diffraction analysis pattern of the waste concrete sludge used in the embodiment of the present invention is shown in FIG.

The presence of large amounts of SiO ₂ , Al ₂ O ₃ and alkali oxides indicates that they have been incorporated from the aggregate.

The shape of the base of the XRD pattern also shows that all samples contain amorphous phases, which are found in samples with high pH slurries or highly active materials such as bentonite or very low crystalline cement hydrates (CSH gels). phenomenon seems to be that calcite is due to the carbonation of Ca (OH) ₂ in the Ca (OH) ₂ and the cement hydrate produced from an alkaline atmosphere of the waste concrete sludge.

With the exception of these minerals with clear diffraction peaks, the other materials that make up the sludge can be seen to be in an amorphous state or at least low crystalline, which is advantageous in terms of the production of solidified materials using sludge.

On the other hand, the grinding (Grinding) in the grinding step (S200) is 40 to 60% of the grinding ball and 40 ~ 60% of the waste concrete sludge after the calcination process to 80 ~ 100rpm so that the powder degree of 2,500 ~ 3,500㎠ / g or more Manufacture. After the grinding step (S200), the classification step (S250) is classified by the size of the particles. That is, in the classification step (S250), the powder is also out of the range of 2,500 ~ 3,500 cm 2 / g is crushed again sent to the grinding step (S200). If the classification is large, the classification step (S250) is included in the grinding step (S200).

Hereinafter, the waste concrete sludge sample that has passed through the crushing step (S200) and the classification step (S250) will be referred to as "WCS".

On the other hand, in the solidifying composition manufacturing process (S300), with respect to 100% by weight of solidifying agent, waste concrete sludge calcined powder 10 ~ 20wt%, portant cement 30 ~ 40wt%, blast furnace slag powder 30 ~ 40wt%, calcium sulfo 5 to 15 wt% of aluminate, 5 to 10 wt% of anhydrous gypsum, or 10 to 20 wt% of waste concrete sludge calcined powder, 30 to 40 wt% of portant cement, 30 to 40 wt% of blast furnace slag powder, It consists of 5 to 15 wt% of calcium sulfoaluminates and 1 to 10 wt% of lime.

Also, with respect to 100wt% of solidifying agent, 10 ~ 20wt% of waste concrete sludge calcined powder, 30 ~ 40wt% of port cement, 30 ~ 40wt% of blast furnace slag powder, 5 ~ 15wt% of calcium sulfoaluminate, Gypsum 5 It may be made by containing ~ 10wt%, lime 1-10wt%.

Here, the Portland Cement (OPC) reacts with lime, that is, quicklime, slaked lime and anhydrous gypsum, and forms a pozzolan and etringite reaction to solidify and stabilize the soft ground. In one embodiment of the present invention, it is preferable to use one ordinary portant cement.

The blast furnace slag powder is a handmade slag, but the initial strength expression is slow but long-term strength expression is excellent due to the latent hydraulic properties of the slag.

In one embodiment of the present invention, the particle size of KS F 2563,2004 blast furnace slag powder is in the range of about 8,000 to 10,000 cm 2 / g, and the loss in ignition is in the range of about 0.1 to 1.0% (preferably, 1.0% or less). It is preferable to use 1 type.

The anhydrite is slow in reactivity but contributes to high strength and stability of solids. The chemical component is CaSO ₄ and reacts with cement, CSA minerals and lime to form Ettringite, and in one embodiment of the present invention, the weight ratio of (OPC + blast furnace slag) / anhydrous gypsum is between about 6-10. About 6.0. ± 0.1 shows the best characteristics.

This weight ratio affects the strength and durability for solidification of the soil, and contributes to the long-term stability.

Anhydrous gypsum applied in one embodiment of the present invention is type II, the specific surface area of the powder is preferably made in the range of about 2,500 ~ 3,500 cm 2 / g.

The lime, that is, quicklime or hydrated lime, contributes to strength expression as a pozzolan reaction inducer, promotes the reactivity of blast furnace slag powder and anhydrous gypsum by initial heat generation, and prevents cracking of solids in the long-term. It has the main effect of improving hydration reactivity.

In addition, the solidifying agent applied to an embodiment of the present invention may be prepared by further mixing 5-10 wt% of bentonite, and for example, the swelling agent is a silicic acid compound whose main component is clay mineral, which has strong hydrophilicity and volume in water. Inflates about 5 to 10 times.

When the bentonite is in contact with dissolved CA ⁺⁺ ions and Na ⁺⁺ ions, they bind to the bentonite surface and the particles become large to stabilize the surface or make it difficult to move groundwater. Contributes to the purpose of the solidification stabilizer composition of the soft ground according to.

In addition, the solidifying agent applied in one embodiment of the present invention may be prepared by further mixing 0.01 ~ 0.1wt% of the accelerator (Accelerator), such a reaction accelerator, for example, tartaric acid (Tartaric acid), WCS to the solidifying agent In the case of inducing the initial strength expression in the replacement, very small amount is added to promote the hydration reaction to the point of curing progresses, which accelerates the Pozzolan reaction, contributing to the strength of the initial solidified.

The main characteristic reactions occurring in the soft ground solidification stabilizer applied to an embodiment of the present invention having the above components are as follows.

First, since Ettringite has a large amount of water as a binding water, the water ratio is lowered and reacts with fly ash and gypsum to produce a solid material. Since needle-like crystals are formed and voids are reduced, cracks due to shrinkage are reduced, and long-term strength is improved and waterproofing is effective.

Secondly, the Pozzolan reaction is not hydrated in itself but reacts with calcium hydroxide to form C-S-H. The addition of the reaction accelerator promotes the production of ettringite and at the same time contributes to the high strength by advancing the pozzolanic reaction.

Subsequently, the WCS prepared in the calcining process (S100), the crushing process (S200), and the classification process (S250) is selectively based on the physicochemical properties of the waste concrete sludge classified above. Mix (S300).

At this time, the mixing composition ratio is preferably made of 10 ~ 20wt% of waste concrete sludge powder, 80 ~ 90wt% of solidifying material.

Briefly summarizing the manufacturing method of the solidification stabilizer composition using waste concrete sludge according to an embodiment of the present invention, the waste concrete sludge cake dehydrated at a water content of about 30-50% to 350 ~ 600 ℃ The calcined water decomposes adsorbed moisture and organic materials, and then the waste concrete sludge calcined compared to the grinding ball is 1: 1 ± 0.1, and the powder level is 2,500 ~ 3,500㎠ / g or more at 80 ~ 100rpm for 10 ~ 15 minutes. After manufacturing, it is mixed with solidifying materials and selectively mixed with solidifying materials to produce structural foundation improvement, river banks, and landfill solidification stabilizers. This technology presents a high economic and environmental contribution technology through effective recycling of waste resources. have.

Hereinafter, specific experimental examples of the solidification stabilizer composition using WCS according to an embodiment of the present invention will be described in detail. In addition, the components used in the preferred experimental examples of the present invention are described in Tables 8 to 10 below.

Experimental Example 1

The composition of the composition for investigating the effect of the selection of the solidifying material when replacing 10 wt% WCS according to an embodiment of the present invention with a solidifying agent is shown in Table 8 below.

The amount of WCS added is 10 wt% by weight of the total solidifying agent composition. (A) Portland cement and blast furnace slag cement are 70 to 80 wt% by weight as the basic solidifying material, and the ratio is 1: 1.0 ± 0.2.

(b) Calcium sulfoaluminate, anhydrous gypsum and lime are added in a weight ratio of 10 to 20 wt%, which is 20 to 80% of calcium sulfoaluminate, 50 to 100% of anhydrous gypsum and 30 to lime relative to the amount of WCS added. 100%, tartaric acid was added 0.0 · 1 ~ 0.1wt% of the solidifying agent composition for the initial strength expression, and tested for the uniaxial compressive strength for each age measured by making the specimen to the results shown in Table 8 below. Got it.

division WCS (a) (b) Uniaxial compressive strength (28 days) (㎏f / ㎠) Control - 90 10 350 A-1 10 70 20 368 A-2 10 75 15 341 A-3 10 80 10 315

In addition, quicklime was added to promote the hydration reactivity of the reaction accelerator and the WCS to promote the initial hydration reaction. The hardener used in Experimental Example 1 minimized the components so that they can be easily used, and the optimum mixing conditions were obtained through experiments to minimize the variation of the invention effect according to the construction sludge generation characteristics and construction conditions.

When the solidification stabilizer solidified specimen using WCS according to Experimental Example 1 of the present invention was prepared and tested for uniaxial compressive strength, as shown in Table 8 above, when 10 wt% of WCS was added in comparison with the control, A-1 When the composition is used it can be seen that the uniaxial compressive strength is improved.

That is, according to the solidifying agent composition which can utilize the WCS applied to the soft ground solidification stability, the uniaxial compressive strength is up to 368kgf / ㎠ exhibits physical properties that can achieve soft ground solidification.

Experimental Example 2

The composition of the composition for investigating the effects of the selection of the solidifying material when replacing 20 wt% of WCS according to an embodiment of the present invention with a solidifying agent is shown in Table 8 below. The amount of WCS added is 10 wt% by weight of the total solidifying agent composition. (A) Portland cement and blast furnace slag cement are 60 to 70 wt% by weight as the basic solidifying material, and the ratio is 1: 1.0 ± 0.2. (b) The sum of calcium sulfoaluminate, anhydrous gypsum and lime is 10 to 20wt% by weight, which is 40 to 70% calcium anhydride, 30 to 50% anhydrous gypsum and 5 to lime relative to the amount of WCS added. 20%, tartaric acid was added to 0.0 · 1 ~ 0.1wt% of the solidifying agent composition for the initial strength expression, and tested for the uniaxial compressive strength for each age measured by making a specimen to the results shown in Table 9 below Got

division WCS (a) (b) Uniaxial compressive strength (28 days) (㎏f / ㎠) Control - 90 10 350 B-1 20 60 20 352 B-2 20 65 15 332 B-3 20 70 10 300

On the other hand, in order to promote the hydration reactivity of the reaction accelerator and WCS in order to promote the initial hydration reaction, quicklime was added 200% by more than in Experimental Example 1. As in Experimental Example 1, the solidifying agent used minimized the components so that they can be easily used, and the optimum mixing conditions were obtained through experiments to minimize the variation of the invention effect according to the construction sludge generation characteristics and the construction water ratio.

As can be seen in Table 9, when the 20 wt% WCS is added as compared to the control, it can be seen that the uniaxial compressive strength is similar when the B-1 composition is used.

That is, according to the solidifying agent composition which can utilize the WCS applied to the soft ground solidification stability, the uniaxial compressive strength is up to 352 kgf / ㎠ exhibits the soft ground physical properties.

Experimental Example 3

Table 11 below shows the composition, uniaxial compressive strength, and permeability coefficient of the composition including the target soil according to WCS addition solidification stabilizer 13% addition and solidification agent water ratio according to Experimental Examples 1 and 3 of the present invention.

On the other hand, the target soil applied to the experimental example of the present invention is shown in Table 10 below the soil analysis and physical and chemical properties of specific items such as specific gravity, natural water content ratio, liquid / plastic limit, body passage, maximum blade diameter, wet unit weight will be.

division importance Natural function ratio (%) Liquid limit (%) Firing limit (%) Plasticity index Blade diameter (mm) 10 Pass rate (%) 40 passing rate (%) No. 200 passage rate (%) Uniform classification Wet Unit Weight Ratio Target soil 1.98 42.9 48.9 21.2 20.6 1.43 100 93.4 78.8 CL 1.56

Target soil WCS hardener Water: Hardener Uniaxial Compressive Strength (㎏f / ㎠) Permeability coefficient (cm / sec) 0.6: 1 0.8: 1 1.0: 1 79.2 Control 13 9.0 12.4 9.7 × 10-8 76.6 13 12.0 14.8 8.7 × 10-8 74.0 13 15.0 15.2 8.1 × 10-8 79.2 A-1 13 9.0 11.9 1.2 × 10-7 76.6 13 12.0 12.4 8.7 × 10-8 74.0 13 15.0 15.3 8.0 × 10-8 79.2 B-1 13 9.0 10.2 1.0 × 10-7 76.6 13 12.0 13.6 9.9 × 10-8 74.0 13 15.0 14.3 9.3 × 10-8

As can be seen in Table 10 above, it can be seen that the uniaxial compressive strength and permeability coefficient are similar to those of the control when the solidification stabilizer composition according to the present invention is used.

That is, according to the solidifying agent composition to which the WCS is added to the present invention, the uniaxial compressive strength is 15.3 kgf / cm 2 and the permeability coefficient is 8.0 × 10 ^-8 cm / sec. It shows the physical properties that can be achieved.

In particular, the uniaxial compressive strength and the coefficient of permeability were found to satisfy the target values of 10 kgf / cm 2 and 1.0 × 10 ⁻⁷ cm / sec, which means that the WCS solidifying agent weight ratio was increased.

The addition of WCS-added solidifying agent pozzolanic additives, such as calcium sulfoaluminate, anhydrous gypsum and lime, generally increases the compressive strength.

In particular, the development of CSH (Calcium Silicate Hydrate) and CAH (Calcium Aluminate Hydrate) -based products greatly contributed to the increase in uniaxial compressive strength and permeability coefficient due to the active hydration of CaO component, which is insufficient in chemical composition of WCS.

Although a preferred embodiment of the above-mentioned solidification stabilizing solidifying agent composition and a manufacturing method using the construction sludge according to the present invention has been described, the present invention is not limited thereto, and the claims and the detailed description of the invention and accompanying drawings It is possible to carry out various modifications within the scope and this also belongs to the present invention.

As described above, the present invention can recycle waste concrete sludge, thereby having an excellent effect on environmental protection, and solidifying the waste concrete sludge by applying the solidifying agent which recycled the waste concrete sludge to be applied to solidification of foundation foundation, river bank, and landfill solidification. As a result, the permeability coefficient is improved and stability can be secured.

It has the effect of utilizing the waste concrete sludge, which contributed to the environmental pollution caused by illegal treatment in the process of recycling aggregate, securing structural stability of foundation foundation, river bank, and landfill foundation.

In addition, according to the present invention, there is an effect that can implement the practicality of the technology of high economic and environmental contribution through high value-added recycling, such as the utilization of the solidifying agent composition of the waste resources.

The solidifying agent composition to which the WCS of the present invention is added has the effect of exhibiting better characteristics as the uniaxial compressive strength and the permeability coefficient satisfy the target value and the weight ratio of the WCS solidifying agent is increased.

In particular, the development of CSH and CAH-based products due to the active hydration of pozzolan additives due to the lack of chemical composition of WCS contributes to the increase in uniaxial compressive strength and permeability coefficient.

Claims (5)

Calcination step of sintering the waste concrete sludge cake generated in the circulation aggregate manufacturing process in a rotary kiln at 350-600 ° C. for 15-30 minutes to remove adsorbed moisture and organic matter and activating the hydration reaction material (S100); A pulverizing process of sintering calcined waste concrete sludge with a powder degree of 2,500 to 3,500 cm 2 / g (S200); A solidifying agent composition manufacturing process of mixing the pulverized waste concrete sludge powder, including 5 to 25 wt% of solidifying agent composition, 50 to 90 wt% of target soil of soft ground, and 5 to 25 wt% of water (S300); Solidification method using waste concrete sludge, characterized in that it comprises a. delete delete delete delete

Images