KR101149343B1 - Composition of slow setting cement - Google Patents

Abstract

PURPOSE: A cement slow-setting composition is provided to improve integrity by including optimal content amount of main material and additive material. CONSTITUTION: A cement slow-setting composition comprises 70-95 weight% of termination main material and 5-30 weight% of additive. The slow-setting composition comprises 100.0 parts by weight of calcium aluminate, 10-500 parts by weight of calcium sulfoaluminate, 30-300 parts by weight of aluminium hydroxide, 0.07-0.5 parts by weight of setting retarder, 0.05-0.4 parts by weight of setting accelerator, and 0.05-0.4 parts by weight of superplasticizer. The additive comprises 100.0 parts by weight of calcium hydroxide, 50-300 parts by weight of calcium sulfate, 0.5-15 parts by weight of hardening accelerator, 0.01-1 parts by weight of retarder, and 0.01-0.2 parts by weight of fluidifier. The cement retarder comprises a first liquid and a second liquid. The first liquid comprises 100.0 parts by weight of slow-setting main material and 250-600 parts by weight of water.

Description

Cement Finishing Composition {Composition of Slow Setting Cement}

The present invention relates to a cement finishing composition and a cement finishing agent using the same. Specifically, the cement finished composition of the present invention is composed of calcium aluminate, calcium sulfoaluminate, aluminum hydroxide as a main component, and a finished main material including a coagulation delay agent, a coagulation accelerator, a fluidizing agent, and calcium hydroxide and calcium sulfate as main components. It relates to a two-component completion composition consisting of an auxiliary material including a curing accelerator, a coagulation delay agent, a fluidizing agent, and a cement finishing agent using the same.

The purpose of the ground grout is to fill the gaps or cracks in the ground as a reinforcement or order of the ground, and to strongly bond with the soil particles to compensate for the soil's strength or to be released to the groundwater. If the soil particles are weakly bonded and voids are generated, it is difficult to achieve the purpose of reinforcing the ground, and if the groundwater is in contact, the unreacted cement and the gel-like part are eluted into the groundwater, causing the hardened body to disintegrate, thus losing its function as an injection material. There is a problem.

In addition, the conventional grout material has been developed focusing on the fastening to express the rapid effect such as reinforcement and order. However, the quick-setting grout material has a problem that it is difficult to achieve a sufficient effect because the penetration depth into the ground is shallow. In order to solve this problem, there have been many demands for a method of delaying the condensation of cement concrete, but there is no proper solution.

KR 10-2010-0048807 (TP) 2010.5.11.

The present invention has been made in order to solve the above problems, the main component of calcium aluminate, calcium sulfoaluminate, aluminum hydroxide, including a coagulation delay agent, a coagulation accelerator, a fluidizing agent, calcium hydroxide, sulfuric acid It is an object of the present invention to provide a two-component finished composition comprising calcium as a main component and an auxiliary material including a curing accelerator, a coagulation delay agent and a fluidizing agent.

In addition, another object of the present invention is to provide a cement finisher using the cement finish composition.

In order to achieve the object as described above, the cement finished composition of the present invention,

(A) 70 to 95% by weight of the finished material comprising: and

100 parts by weight of calcium aluminate;

10 to 500 parts by weight of calcium sulfoaluminate;

30 to 300 parts by weight of aluminum hydroxide;

0.07 to 0.5 parts by weight of a coagulation delay agent;

0.05 to 0.4 parts by weight of a coagulant; And

0.05 to 0.4 parts by weight of a glidant,

(B) 5 to 30% by weight of the auxiliary material, which is constituted separately from the finished main material, including:

100 parts by weight of calcium hydroxide;

50 to 300 parts by weight of calcium sulfate;

0.5 to 15 parts by weight of a curing accelerator;

0.01 to 1 part by weight of a coagulation delay agent; And

0.01 to 0.2 part by weight of glidant

Characterized in that it comprises a.

In addition, the finished material may further comprise 45 to 400 parts by weight of silica per 100 parts by weight of calcium aluminate.

In addition, the auxiliary material may further include 10 to 250 parts by weight of pozzolane per 100 parts by weight of calcium hydroxide.

In addition, the calcium aluminate may have a molar ratio of calcium oxide (CaO): alumina (Al ₂ O ₃ ) of 12: 7.

In addition, the calcium aluminate is preferably amorphous.

In addition, the powder degree of the component selected from the group consisting of the calcium aluminate, calcium sulfoaluminate and pozzolan is preferably Bleinch 4,000 to 10,000 cm ² / g.

In addition, the calcium sulfate is preferably anhydrous gypsum.

In addition, the powder degree of the aluminum hydroxide and silica is preferably Bleinch 3,000 to 10,000 cm ² / g.

On the other hand, the cement finalizer of the present invention

First liquid and 250 to 600 parts by weight of water per 100 parts by weight of the finished material and

A second liquid in which 100 to 600 parts by weight of cement is mixed per 100 parts by weight of the auxiliary material, and 0.6 to 2.5 times of water of the total weight of the auxiliary material and cement is mixed;

Made of

The first liquid and the second liquid are configured separately,

The weight ratio of the first liquid and the second liquid is 1: 0.8 to 1.4

It is characterized by that.

The cement final composition of the present invention is a suitable coagulant and coagulation delay agent together with a high-grade calcium aluminate, calcium sulfo aluminate, and aluminum hydroxide as a main ingredient, and auxiliary materials mainly containing calcium hydroxide and calcium sulfate. And a glidant, and by optimizing the content of the first component, it is possible to provide a cement finisher that exhibits a breakthrough level of completeness that was not previously attainable.

1 is a conceptual diagram showing the configuration of the complete cement of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail. In the following description, numerous specific details, such as specific elements, are set forth in order to provide a thorough understanding of the present invention, and it is to be understood that the present invention may be practiced without these specific details, It will be obvious to those who have knowledge of. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The present invention is a semi-permanent order and reinforcement grouting is possible without the use of conventional sodium silicate without any dissolution phenomenon, environmentally friendly grouting material that solves the problem of durability degradation and environmental pollution.

In addition, the present invention has no difference except using cement mineral fine powder instead of conventional sodium silicate, so the existing sodium silicate chemical injection device (three or four tank stirring compounding device, injection pump and tip device) can be used as it is. It can be applied to any injection device without any additional equipment burden.

First, the cement mineral that can condense cement milk is a calcium aluminate mineral, and is a continuous solid solution of calcium oxide (CaO) and alumina (Al ₂ O ₃ ) and has various mineral properties depending on the composition ratio. Often, calcium oxide is expressed as C and alumina is expressed as A. Portland cement is present in the form of C ₃ A in an amount of about 5 to 10%, which plays an important role in cement coagulation. In addition, minerals such as CA, CA ₂ and C ₁₂ A ₇ are not only main components of alumina cement but also gypsum, and is hydrated mineral called etrinzite (Ettringite, 3CaO? Al ₂ O ₃ -3CaSO ₄ -32H ₂ O). It is a mineral that is widely applied to special cements and mortars such as super-hard and fast-hardening cements, steels, repair materials, self-leveling materials, etc. due to the formation of roughness.

Specifically, the calcium aluminate mineral reacts violently with calcium oxide and calcium sulfate (CaSO ₄ ) components eluted from the cement when reacted with cement to form acicular ethrinzite crystals, which are cemented. Or by combining aggregate particles exhibits rapid setting characteristics.

In the reaction scheme, in the case of C ₃ A (3CaO? Al ₂ O ₃ ) minerals,

Scheme 1

3CaO? Al ₂ O ₃ + 3 (CaSO ₄ ? 2H ₂ O) + 26H ₂ O → 3CaO? Al ₂ O ₃ ? 3CaSO ₄ ? 32H ₂ O

In the case of C ₁₂ A ₇ (12CaO ₇ Al ₂ O ₃ ) minerals,

Scheme 2

12CaO-7Al ₂ O ₃ + 9Ca (OH) ₂ + 21 (CaSO ₄ ? 2H ₂ O) + 173H ₂ O → 7 (3CaO? Al ₂ O ₃ ? 3CaSO ₄ ? 32H ₂ O)

Ethrinite is formed as follows. When calcium sulfate is insufficient, monosulfate (Monosulfate, 3CaO? Al ₂ O ₃ ? CaSO ₄ ? 12H ₂ O) having a relatively short crystal form may be produced.

Ethrinzite is a hydrate containing 32 moles of water per molecule, which crystallizes rapidly by fixing water in cement milk and crystallizes very quickly. Does not interfere with the hydration of cement particles. Furthermore, ethrinzite is a structure that can be likened to the steel structure of a building. As time passes, alite (3CaO? SiO ₂ ) of cement becomes calcium silicate hydrate (Calcium Silicate Hydrate, CSH). Filling the voids between them becomes a more compact hardened body. In addition, the hydrate of cement minerals have a water resistance that does not dissolve or dissolve in water, thereby forming a permanent hardening body without long term dissolution.

The injection material using cement mineral as a coagulant is high in strength and long-term because it is hardened by insoluble cement hydrated mineral which does not dissolve in water, unlike sodium silicate-based injection material which has low strength and loses its function by elution in the long term. It is stable and has a permanent grouting effect. In addition, due to the rapid generation of ethrinzite, the main hydrated mineral, gel time is very fast, and gel timing can be freely controlled using a suitable coagulation delay agent such as an organic acid salt.

In addition, ethrinzite is expandable to compensate for dry shrinkage of the cured product to further enhance durability, and sulfate ions (SO ₄ ^2- ) in ethrinite are combined with heavy metal ions such as chromium oxide (Cr ₂ O ₃ ). Since it is replaceable, it is possible to prevent contamination of hexavalent chromium in cement, which is a problem in recent years, and insoluble hydrate is generated, and thus it has an environmentally friendly property to prevent contamination of soil or groundwater due to leaching.

The cement finished composition of the present invention is composed of an auxiliary material composed of an additive and admixture capable of controlling the reaction rate between the finished material mainly composed of the finished cement mineral and the cement and the finished material in order to easily control the gel time according to the construction purpose. It is. When preparing the slurry for construction, the finalizer is condensed with cement, so it must be prepared separately as a final liquid.As the auxiliary material does not react with cement, it is mixed with cement and made into a slurry. Are transported separately and injected into the ground to form a two-component composition that is mixed and condensed.

Referring to each component of the cement finished composition of the present invention in detail.

First of all, calcium aluminate minerals in the finished materials are in the form of CA, CA ₂ , C ₁₂ A _{7 and} C ₃ A depending on the composition ratio of calcium oxide and alumina as main components of the finalizer. The more condensation is, the faster the characteristic is. In particular, calcium aluminate is characterized by condensation in a few seconds to several tens of minutes when reacted with an alkali substance such as portland cement or calcium hydroxide, and these properties vary greatly depending on the type of mineral, the compounding ratio, and the crystal state of the mineral. Practically, C ₁₂ A ₇ has the fastest setting time, and it is used as a quick setting agent in shotcrete construction because it shows faster setting characteristics when it is amorphous than crystalline. In addition to the above minerals, calcium fluoride-calcium aluminate (CaF ₂ -C ₁₁ A ₇ ) stabilized by partial substitution of C ₁₂ A ₇ with fluorine or calcium sulfoaluminate (4CaO 3 Al ₂ O) in which gypsum is bonded to calcium aluminate Minerals such as _3– CaSO ₄ ) work similarly.

Calcium aluminate is mixed with raw materials composed mainly of calcium oxide such as limestone or quicklime and raw materials composed mainly of alumina such as bauxite, sintered alumina, aluminum hydroxide, etc. to be suitable for mineral composition, and then fired in rotary furnace, vertical furnace, etc., or melted in electric furnace. It is prepared by solidifying.

Calcium aluminate-based minerals compensate for the dry shrinkage that occurs severely in the early age of hardened cement due to the stiffness of ethrinzite as well as the roughness due to the formation of ethrinite when reacted with portland cement. Because of its ability to impart weak expansion properties, it is widely applied to special cement or mortar products. The present invention utilizes the calcium aluminate and calcium sulfoaluminate minerals described above.

Among the calcium aluminate minerals, amorphous C ₁₂ A ₇ was found to have the best coagulation effect in this product. The performance of amorphous C ₁₂ A ₇ depends on the state of amorphous.To prepare amorphous minerals, the raw materials are completely melted in a melting furnace, such as an electric furnace, and then cooled as rapidly as possible to produce a kind of glass. . At this time, in order to increase the cooling rate is mainly used to cool by air, but because it is impossible to obtain a complete glassy amorphous, there is a problem that the performance is degraded because some of the crystals. The mineral used in the present invention is characterized in that the powder is pulverized to a ble inch of 4,000 to 10,000 cm ² / g after forming a nearly perfect amorphous mineral by spraying the appropriate amount of water together with cooling and dried by filtrate. Compared to this, the performance is much improved. Therefore, the complete agent using this mineral is characterized by excellent coagulation performance so that the gel time is expressed in a few seconds, and can be freely controlled by using the coagulation delay agent, it is characterized by a wide range of applications.

In the present invention, in order to increase the strength in the long term to improve the durability, the condensation property is very late, but the formation of ethrinite is stable, and calcium sulfoaluminate (4CaO? 3Al ₂ O ₃ -CaSO ₄ ) mineral was combined. In the present invention, the blending amount of calcium sulfoaluminate is preferably 10 to 500 parts by weight per 100 parts by weight of calcium aluminate. If the blending amount is less than 10 parts by weight, the long-term strength enhancing effect cannot be sufficiently expected, and if it exceeds 500 parts by weight, the gel time is excessively delayed.

In the present invention, aluminum hydroxide, such as Al (OH) ₃ or AlO (OH) .nH ₂ O, is included as one component of the finished main material. Alkali metal-containing materials such as aluminum hydroxide not only enhance initial strength developability, but are also added in acidic liquid fasteners because it is difficult to dissolve a large amount of alkali metal in terms of long-term stability of the liquid.

Although the composition ratio of aluminum hydroxide is not specifically limited, 30-300 weight part is preferable with respect to 100 weight part of calcium aluminate. If the composition ratio is less than 30 parts by weight, low adhesiveness or excellent condensation properties may not be obtained, and if it exceeds 300 parts by weight, flow retention of concrete may be lowered and long-term strength developability may be impaired.

In addition, the finished material of the present invention may further include silica. The silica may not only provide a strength enhancement effect to the concrete into which the finalizer composition of the present invention is injected, but also provide a strength compensation effect of the fine particles to maintain the watertightness of the cured product, which has a significant effect on the durability of the cured product. Such silica is preferably included as much as 45 to 400 parts by weight per 100 parts by weight of calcium aluminate in the finished material, the expression of the above-described effects such as increased durability is less than the above range, the initial strength is lowered if the above range is exceeded And the gel time is delayed.

In the finished material of the cement composition of the present invention, because the hydration rate of the amorphous C ₁₂ A ₇ is too fast when dispersing the final agent composition in water, a coagulation retardant may be used to prevent the coagulation performance from being lost due to the reaction. As a coagulation delay agent, organic acids such as citric acid, gluconic acid, boric acid and tartaric acid, and organic acid salts such as sodium citrate and sodium gluconate can be used. Among them, sodium citrate can be obtained best. In the present invention, the amount of the coagulation delay agent is preferably 0.07 to 0.5 parts by weight per 100 parts by weight of calcium aluminate. If the blending amount is less than 0.07 parts by weight, the condensation delay effect may not be sufficiently expected, and if it exceeds 0.5 parts by weight, the condensation may be excessively delayed.

The finished subject matter of the present invention also includes a coagulation accelerator, which is a admixture that allows the coagulation of concrete to occur in a short time. Lithium carbonate, sodium sulfate, sodium carbonate, calcium chloride, etc. which can be used as a coagulant are especially preferable lithium carbonate. In the present invention, the amount of the coagulation accelerator is preferably 0.05 to 0.4 parts by weight per 100 parts by weight of calcium aluminate. If the blending amount is less than 0.05 parts by weight, it is not possible to fully expect the effect of promoting the condensation, if the amount exceeds 0.4 parts by weight has a disadvantage of poor durability.

Dispersion of the finalizing agent composition into water may result in a slight reaction, which may reduce the fluidity of the injection liquid. Since the lowering of the fluidity adversely affects the injection characteristics, the fluidizing agent was used to improve the fluidity. As the fluidizing agent, various fluidizing agents such as lignin-based, naphthalic acid-based, and polycarboxylic acid-based may be used. The polycarboxylic acid-based fluidizing agent exhibits the best performance. In the present invention, the compounding amount of the fluidizing agent is preferably 0.05 to 0.4 parts by weight per 100 parts by weight of calcium aluminate. If the blending amount is less than 0.05 parts by weight, the fluidity improving effect cannot be sufficiently expected. If the blending amount is more than 0.4 part by weight, this results in a deterioration of the coagulation property of the cement fastener.

In addition, calcium hydroxide in the auxiliary material increases the concentration of the hydration reactant during the initial hydration reaction, thereby increasing the rate at which calcium aluminate forms ethrinite, thereby making curing smooth.

In addition, calcium sulfate in the auxiliary material has an effect of improving the late curing rate and compressive strength. Sulfur trioxide ions, a component of calcium sulfate, react with calcium aluminate hydrate during initial hydration to produce and grow acicular crystals of ethrinzite. It grows over time and serves to strengthen the binding of hydration tissue. Calcium sulfate has the hemihydrate, dihydrate, and anhydride depending on the binding state of the crystallized water, but the physical properties when the anhydride is added are the best. In the present invention, the blending amount of calcium sulfate is preferably 50 to 300 parts by weight per 100 parts by weight of calcium hydroxide. If the blending amount is less than 50 parts by weight, the needle growth effect of the ethrinzite can not be expected sufficiently, and if it exceeds 300 parts by weight, the effect of increasing the compressive strength of the final cured body is insignificant.

The adjuvant of the present invention may also further comprise pozzolans. The pozzolane is a kind of concrete admixture made of mineral powder such as volcanic ash, which itself is not hydrophobic but finely divided with calcium hydroxide dissolved in water in concrete and a silica-like substance which can be slowly mixed at room temperature to form an insoluble compound. As a material in the state, it contributes to the formation of long-term strength of cement. In particular, in addition to the effect of densifying hydrate tissue and enhancing long-term strength, the ultra-fine form of pozzolane particles plays a role of increasing chemical resistance and increasing durability by employing chemicals penetrating from the outside. Such pozzolanic is preferably included as much as 10 to 250 parts by weight per 100 parts by weight of calcium hydroxide in the auxiliary material, the expression of the above-described effects, such as increased long-term strength is less than the above range, the initial strength is lowered and the gel is exceeded above the above range There is a problem that the time is delayed.

Preferably, the calcium aluminate, calcium sulfoaluminate and pozzolan have a powder degree of Bleich 4,000 to 10,000 cm ² / g, and aluminum hydroxide and silica are preferably 3,000 to 10,000 cm ² / g. Although the particle size of these particles is not particularly limited, at least the lower limit of the above range is preferable from the viewpoint of initial strength developability, and if it exceeds this, the loss due to scattering is large and not economical.

The auxiliary material of the present invention also includes a curing accelerator, which is a admixture that promotes the hydration of cement to increase the initial strength of concrete. As a hardening accelerator, calcium chloride, magnesium chloride, sodium silicate, calcium silicate, and the like can be used. Conventionally, many calcium chlorides have been used, but problems of corrosion of reinforcing steel in concrete have been pointed out, and thus sodium carbonate was used in the present invention. In the present invention, the blending amount of the curing accelerator is preferably 0.5 to 15 parts by weight per 100 parts by weight of calcium hydroxide. If the blending amount is less than 0.5 parts by weight can not be expected to fully promote the hardening effect of promoting the generation of heat and early strength development, if it exceeds 15 parts by weight has a disadvantage in that the durability is lowered and the auxiliary material is hardened by itself.

The coagulant delay agent was used to prevent the coagulant loss due to the reaction in advance because the hydration rate of the amorphous C ₁₂ A ₇ is too fast when the final composition is dispersed in water. As a coagulation delay agent, organic acids such as citric acid, gluconic acid, boric acid and tartaric acid, and organic acid salts such as sodium citrate and sodium gluconate were used. Among them, sodium citrate was the best. In the present invention, the amount of the coagulation delay agent is preferably 0.01 to 1 part by weight per 100 parts by weight of calcium hydroxide. If the blending amount is less than 0.01 parts by weight, the effect of delaying the condensation cannot be sufficiently expected, and if it exceeds 1 part by weight, the condensation is excessively delayed.

When the powder of the auxiliary composition is mixed with the cement milk, the fluidity is slightly lower than that of the cement milk itself, which may affect the injection characteristics. Therefore, a fluidizing agent is used to improve the fluidity of the composition, and various fluidizing agents such as lignin-based, naphthalic acid-based, and polycarboxylic acid-based may be used. The polycarboxylic acid-based fluidizing agent exhibits the best performance. In the present invention, the blending amount of the fluidizing agent is preferably 0.01 to 0.2 parts by weight per 100 parts by weight of calcium hydroxide. If the blending amount is less than 0.01 parts by weight, the fluidity improving effect cannot be expected sufficiently, and if it exceeds 0.2 parts by weight, this results in a deterioration of the coagulation property of the cement fastener.

The cement finalizer of the present invention is a mixture of 100 to 600 parts by weight of the first liquid mixed with 250 to 600 parts by weight of water to 100 parts by weight of the finished material in the cement finished composition, and 100 parts by weight of the auxiliary material in the cement finished composition, And a second liquid in which 0.6 to 2.5 times the total weight of the auxiliary material and the cement are mixed.

The finished material and the auxiliary material are separately configured so as not to be mixed with each other, such as packaged in separate containers, and the first liquid and the second liquid are also characterized in that they have a two-liquid configuration to be mixed in the ground immediately before or at the same time as the injection.

It is preferable that the weight ratio of the said 1st liquid and the 2nd liquid is 1: 0.8-1.4, and when it out of the said range, it is difficult to fully express the effect of this invention represented by completeness.

Hereinafter, embodiments of the present invention will be described.

Example

Example  One

In order to confirm the physical properties during the ground injection of the present invention, the mixture of the first and second liquids was mixed and mixed for 5 minutes by the mixing ratio of Table 1, and then the two liquids were mixed to gel the slurry (gel time) and the cured product. The uniaxial compressive strength of each age was measured.

At this time, the composition of the auxiliary material in the second liquid was fixed as shown in Table 2, and the composition of the finished main material in the first liquid was changed as shown in Table 3, and the physical properties thereof were measured.

Physical properties of each component used in the cement finished composition of the present invention are as follows.

Calcium aluminate (C ₁₂ A ₇ ): amorphous, Bleinch 4,000 cm 2 / g or more powder,

Aluminum hydroxide: Moisture 1% or less, Bleinch 3,000 cm 2 / g or more powder,

Calcium sulfoaluminate: Bleinch 4,000 cm 2 / g or more powder,

Cement: ordinary portland cement,

Calcium hydroxide: Ca (OH) ₂ content 90% by weight or more,

Calcium sulfate: anhydrous gypsum,

Pozzolanic: slag, fly ash, bleinch 4,000 to 10,000 cm 2 / g powder degree,

Coagulant: lithium carbonate,

Curing accelerator: sodium carbonate,

Coagulation retardant: sodium citrate,

Glidant: Polycarboxylic acid powder type glidant

Conduct compounding ratio division First liquid 2nd liquid Completion water cement Auxiliary water Ratio (weight ratio) 100 450 80 30 150

Composition of auxiliary materials division Calcium hydroxide Calcium sulfate Pozolan Hardening accelerator Coagulation delay Glidants Ratio (weight ratio) 40 30 30 One 0.01 0.02

Changes in Physical Properties According to the Composition of Finishing Agents Example Finisher (weight ratio) Gel
Time
(sec) Uniaxial compression
Strength (MPa) Calcium Aluminate Hydroxide
aluminum Calcium sulfoaluminate Silica congelation
Retardant congelation
accelerant Flow
issue 1 day 28 days 1-1 40 15 25 20 0.03 0.02 0.02 36 0.52 2.44 1-2 30 10 35 25 0.03 0.02 0.02 60 0.48 2.45 1-3 20 10 30 40 0.03 0.02 0.02 89 0.37 2.78 1-4 10 20 40 30 0.03 0.02 0.02 123 0.32 2.82 1-5 20 10 60 10 0.03 0.02 0.02 76 0.39 2.42 1-6 30 10 40 20 0.03 0.02 0.02 49 0.44 2.57 1-7 40 15 25 0 0.03 0.02 0.02 46 0.50 2.20

Example  2

As shown in Table 4, the physical properties were measured according to the composition change of the auxiliary material in the second liquid. At this time, the implementation ratio of the experimental method and the finished material was the same as in Example 1-2.

Property Changes According to Composition of Auxiliary Materials room
city
Yes Auxiliary
(Based on weight ratio-calcium hydroxide) Gel
Time
(sec)
Uniaxial compression
Strength (MPa) Hydroxide
calcium Sulfuric acid
calcium Pozolan congelation
accelerant congelation
Retardant Glidants 1 day 28 days 2-1 50 50 0 0.5 0.05 0.02 63 0.52 2.44 2-2 40 50 10 1.0 0.01 0.02 59 0.48 2.45 2-3 30 40 30 1.5 0.10 0.02 76 0.37 2.78 2-4 20 40 40 2.0 0.10 0.02 95 0.32 2.72 2-5 30 30 40 1.5 0.05 0.02 60 0.39 2.78 2-6 40 30 30 1.0 0.01 0.02 55 0.44 2.77

Example  3

As shown in Table 5, the water ratio of the first liquid: the finished material was changed to 300 wt% to 500 wt%, and the physical properties thereof were measured.

At this time, the composition of the auxiliary material in the second liquid was fixed as shown in Table 2 of Example 1, and the implementation blend ratio of the finished material was the same as in Example 1-2.

Changes in physical properties depending on the blending ratio and the water material ratio (W / M) Example
First liquid 2nd liquid W / M
Gel time
(sec) Uniaxial Compressive Strength (MPa) Completion water cement Auxiliary water 1 day 28 days 3-1

100

300

80



30



150

300 31 0.85 2.87 3-2 350 350 46 0.79 2.73 3-3 400 400 51 0.61 2.58 3-4 450 450 60 0.48 2.45 3-5 500 500 93 0.33 2.28

Example  4

Table 6 shows the change of physical properties according to the ratio of cement and auxiliary materials in the second liquid. At this time, the composition and the test method of the auxiliary material were fixed as shown in Table 2 of Example 1, and the mixing ratio of the finished material was the same as that of Example 1-2.

Cement in the Second Liquid: Physical Properties Changed by Auxiliary Material Ratio Example
First liquid 2nd liquid Gel time
(sec) Uniaxial Compressive Strength (MPa) Completion water cement Auxiliary water 1 day 28 days 4-1
100

250
80 30 160 56 0.89 2.88 4-2 120 30 150 54 0.99 3.15 4-3 160 30 140 60 1.15 3.59

Comparative example  One

The uniaxial compressive strength for each age of the gel time and the cured body was measured by the same experimental method as in Example 1 according to the compounding ratio of Table 7, and the physical properties of the present invention, which is an inorganic system and the sodium silicate system, in Table 8 were compared. The sodium silicate used was liquid, and the molar ratio of Na ₂ O to SiO ₂ was 1.4.

Sodium silicate ground injection material compounding ratio division First liquid 2nd liquid Sodium silicate water cement SGR Pharmaceutics (Kumto, Korea) water Ratio (weight ratio) 100 100 60 24 168

division Gel time
(sec) Uniaxial Compressive Strength (MPa) 1 day 28 days Sodium Silicate 60-90 0.46 1.82 Mineral Example 4-1 56 0.89 2.88

Test Example

In order to analyze the environmental impact of this method, the cured product of Example 4-1 was immersed in water for 3 days to analyze the heavy metal content in the effluent. As a result, no heavy metals were detected in the leached water, and there was no leaching of hexavalent chromium, which is a problem by using cement.

This is because the sulfate ion in ethrinzite, the main hydration mineral, is substituted with heavy metal ions such as chromium oxide to fix heavy metals, and thus is fixed in the cured body. This is due to the extremely low elution component.

Test Items unit Quantitative Limit result Test Methods Hexavalent chromium

mg / L


0.01 Not detected

KS M 0032: 2009


Copper 0.008 Not detected cadmium 0.002 Not detected lead 0.04 Not detected arsenic 0.005 Not detected Mercury 0.0005 Not detected

In the above description of the preferred embodiment of the present invention, the present invention is not limited to the specific embodiments described above, those skilled in the art various modifications without departing from the gist of the present invention Of course it is possible. Therefore, the scope of the present invention should not be construed as being limited to the above embodiments, but should be defined by the claims below and equivalents thereof.

Claims (8)

(A) 70 to 95% by weight of the finished material comprising: and
100 parts by weight of calcium aluminate;
10 to 500 parts by weight of calcium sulfoaluminate;
30 to 300 parts by weight of aluminum hydroxide;
0.07 to 0.5 parts by weight of a coagulation delay agent;
0.05 to 0.4 parts by weight of a coagulant; And
0.05 to 0.4 parts by weight of a glidant,
(B) 5 to 30% by weight of the auxiliary material, which is constituted separately from the finished main material, including:
100 parts by weight of calcium hydroxide;
50 to 300 parts by weight of calcium sulfate;
0.5 to 15 parts by weight of a curing accelerator;
0.01 to 1 part by weight of a coagulation delay agent; And
0.01 to 0.2 part by weight of glidant
Cement complete composition comprising a. The method according to claim 1,
The finished material is a cement complete composition, characterized in that it further comprises 45 to 400 parts by weight of silica per 100 parts by weight of calcium aluminate. The method according to claim 1,
The auxiliary material further comprises 10 to 250 parts by weight of pozzolan per 100 parts by weight of calcium hydroxide. The method according to any one of claims 1 to 3,
The calcium aluminate is a cement complete composition, characterized in that the molar ratio of calcium oxide (CaO): alumina (Al ₂ O ₃ ) is 12: 7. The method according to any one of claims 1 to 3,
The calcium aluminate is a cement finished composition, characterized in that the amorphous. The method according to claim 3,
The calcium aluminate, calcium sulfoaluminate, aluminum hydroxide, and pozzolan powder of the component selected from the group consisting of 4,000 inches to 10,000 cm ² / g complete cement composition, characterized in that. The method according to claim 2,
The fineness of the silica is a cement finish composition, characterized in that the Bleinch 3,000 to 10,000 cm ² / g. The first liquid mixed 250 to 600 parts by weight of water per 100 parts by weight of the finished material of any one of claims 1 to 3 and
2nd liquid which mixed 100-600 weight part of cements per 100 weight part of auxiliary materials of any one of Claims 1-3, and mixed water of 0.6-2.5 times of the total weight of the said auxiliary material and cement.
Made of
The first liquid and the second liquid are configured separately,
The weight ratio of the first liquid and the second liquid is 1: 0.8 to 1.4
Cement finisher, characterized in that.

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