WO2013100297A1

WO2013100297A1 - Inorganic binder for grout and filler

Info

Publication number: WO2013100297A1
Application number: PCT/KR2012/005574
Authority: WO
Inventors: 김진수; 서영상; 문경주
Original assignee: (주)한일
Priority date: 2011-12-29
Filing date: 2012-07-13
Publication date: 2013-07-04
Also published as: KR20130077380A; KR101351300B1

Abstract

The present invention relates to an inorganic binder for grout and filler, and more particularly, to an eco-friendly inorganic binder for grout and filler which resolves environmental problems such as the production of carbon dioxide and resource depletion problems due to the collection of limestone by constituting an inorganic binder for grout and filler by mixing 15-25 wt% of cement, 50-70 wt% of fly ash, 9-20 wt% of bypass dust, and 1-5 wt% of water-soluble polymer, thereby reducing the use of Portland cement; which exhibits better strength and durability than inorganic binders using Portland cement as a major ingredient (mixed in at least 50 % by weight) resulting from the application of fly ash and bypass dust in a fine particulate form as a substitute for the reduced amount of Portland cement and thereafter using water-soluble polymer as an activator and thus enabling small quantities of cement to have a dense structure due to the inorganic binder composed thereof; and which also prevents environmental contamination caused by industrial waste by recycling industrial waste such as the fly ash and bypass dust mentioned above.

Description

Inorganic binders for ground grouts and fillers

The present invention relates to an inorganic binder for ground grout and fillers, and specifically, to reduce the amount of Portland cement as much as possible, and to replace it with fly ash and ultra-fine bypass dust, which are circulating resources generated as workplace waste. (bypass dust), and to an inorganic binder for ground grout and filler using a water-soluble polymer as an active agent.

In general, when constructing various structures on the ground, in the case of the soft ground composed of soft soil such as sea-viscosity clay and stratified clay, due to the geographic characteristics of the ground, the ground is improved and reinforced, and the embankment, landfill, etc. In case of requiring the order, the work of forming the vertical order wall in the ground is carried out.

Representative methods for improving the soft ground and forming the vertical order wall as described above are a substitution method by cutting, a deep mixing method for mixing and mixing a solidifying agent, which is a chemical solution, with a soft soil, and a chemical solution to solidify the gap between the earth and sand with a curable material. Injection method can be mentioned.

Among the above methods, the chemical liquid injection method, which is representative of the low pressure injection method, is also called grout, and the durability of the injection material due to environmental pollution, leaching of the injection material, and separation of materials by using a chemical agent, which is an existing solidifying agent, as a hardening material It causes a problem such as deterioration, and the substitution method, which is representative of high pressure injection methods, has a problem of generating environmental problems by the generation of industrial waste by the replacement work of the target ground.

Therefore, in recent years, as a way to solve the above problems, research on the ground grout and fillers of inorganic series that reduces the use of chemicals used as a solidifying agent and expresses the characteristics of high strength and high durability, have.

As a related prior art, Korean Patent Publication No. 10-0884285 (hardening agent for soft ground improvement and its ultra high pressure water spraying device and ground improvement method using the same), Korea Patent Publication No. 10-0876222 (functional high ground for soft ground improvement) Fire) and the Republic of Korea Patent Publication No. 10-2004-0014024 (soil reinforcement improving material) and the like, such conventional techniques are usually based on Portland cement. That is, in case of Republic of Korea Patent Publication No. 10-0884285, 50% by weight of Portland cement is mixed, in case of Republic of Korea Patent Publication No. 10-0876222, 65% by weight of Portland cement is mixed, and Republic of Korea Patent Publication No. 10-2004 For -0014024, Portland cement is mixed 60% by weight.

However, when Portland cement is composed of the main raw material (mixed more than 50% by weight) as described above, humic acid and fulvic acid in organic soil react with calcium hydroxide produced by the hydration reaction of Portland cement. Since calcium humic acid is produced and such a product destroys unhydrated cement particles, thereby inhibiting the hydration reaction of cement, there is a problem in that the effect of ground improvement as a solidifying material is reduced.

In addition, organic matters in organic soils are classified into two types: organic matters that are not decomposed in flora and fauna and amorphous organic matters (corrosion or flounder) produced by the decomposition of animal and animal fluids by microorganisms, which are brown or dark brown. As a colloidal material having hydrophilicity and excellent cation adsorption capacity, there is a problem in that it adsorbs on particles and hinders contact between cement and soil particles.

On the other hand, in order to solve the above problems, there is a cement solidified material which uses Portland cement as a base material and adds a large amount of high-priced calcium sulfo aluminate compound or gypsum, but this exhibits its characteristics as an expensive mixed material. It is uneconomical because it requires adding a large amount. In addition, calcium sulfo aluminate-based compounds are usually manufactured by high-temperature firing process, such as portland cement, so they emit large amounts of carbon dioxide during the manufacturing process. This is a problem.

On the other hand, in relation to the above problems, it is known that about 8% of carbon dioxide (CO ₂ ) emissions accounting for 55% of the greenhouse gases are emitted from the cement manufacturing field. In particular, Portland cement can be produced only when it is melted at a high temperature (1,450 ° C). Therefore, as shown in [Table 1], not only consumes a large amount of energy but also produces about 1 ton of carbon dioxide when producing 1 ton of cement. In addition, as shown in Figure 1, it can be seen that the concentration of carbon dioxide in the atmosphere increases in proportion to the world Portland cement production from 1840 to 2000.

Table 1

Item	Conversion amount
CO2 emissions	- CO from the decarbonation _2: 0.52 ton coal CO ₂ from combustion: 0.32 tone-produced in thermal power stations in order to drive a power plant site CO _2: 0.1 ton
Gas generation from other coal combustion	Carbon monoxide (CO), sulfur oxides (SOx), nitrogen oxides (NOx), fine dust, etc.
Need heat capacity	4GJ (Giga Joule)
Coal consumption	132 kg
CO ₂ from coal combustion in cement kilns1 ⁾	CO ₂ 2,418kg2,418 × 0.132 = 320kg for burning one ton coal
Note 1) The amount of heat of the coal fossil fuel used in the cement kiln is 26GJ / t, CO ₂ emission factor in terms of 93kg / GJ

Therefore, GHG reduction will emerge as the biggest issue in the cement industry in the future, and if the agreement goes into effect, the Korean cement industry is expected to reduce cement clinker production by more than 50%.

In addition, about 70 million tonnes of limestone are mined to produce 60 million tonnes of cement clinker per year. At present, Korea's limestone reserves are only about 4 billion tons, which will be exhausted in less than 50 years.As a result, a huge amount of limestone is cut down from the top of Baekdudaegan and cascaded. The beautiful natural landscape is desolately damaged and the source of water resources is depleted.

The present invention is to solve the above problems, to reduce the use of Portland cement as much as possible, by using the circulating resources generated as workplace waste to manufacture an inorganic binder for ground grout and fillers, thereby reducing the amount of Portland cement An object of the present invention is to provide an inorganic binder for ground grout and fillers to solve environmental problems such as carbon dioxide generation and resource depletion due to excessive limestone extraction.

In addition, as a circulating resource used in place of the reduced portland cement, fly ash, ultra-fine bypass dust is applied, and a small amount of cement is used by using a water-soluble polymer as an activator. Has a more compact structure by the inorganic binder is configured as described above for the ground grout and filler material that can implement superior strength and durability compared to the inorganic binder using Portland cement as the main raw material (mixing more than 50% by weight) Another object is to provide an inorganic binder.

In addition, it is another object of the present invention to provide an environmentally friendly ground grout and an inorganic binder for filling material that can prevent environmental pollution by industrial waste by recycling industrial waste such as fly ash and bypass dust as described above.

The present invention is an inorganic binder for ground grout and filler, 15 to 25% by weight of cement, 50 to 75% by weight of fly ash, 9 to 20% by weight of bypass dust and 1 to 5 of water-soluble polymer. An inorganic binder for ground grout and a filler, which is composed of a weight%, is a solution for the problem.

On the other hand, the fly ash preferably has a powder degree of 4000 ~ 5000 cm 2 / g.

In addition, it is preferable to select and use together 1 or more types of the said water-soluble polymer among polyacrylate, cellulose, polyvinyl alcohol, or polyacrylamide.

The present invention is to reduce the use of Portland cement as much as possible, by replacing the use of circulating resources generated from the workplace waste to manufacture the inorganic grout for ground grout and fillers, reducing the amount of Portland cement and environmental problems such as carbon dioxide generation and excessive There is an advantage that can solve the problem of resource depletion caused by limestone extraction.

In addition, as a circulating resource used in place of the reduced portland cement, fly ash, ultra-fine bypass dust is applied, and a small amount of cement is used by using a water-soluble polymer as an activator. Has a more dense structure by the inorganic binder is configured as described above, which has the advantage that it can implement excellent strength and durability compared to the inorganic binder using Portland cement as the main raw material (mixed 50% by weight or more).

In addition, by recycling the industrial waste, such as fly ash, bypass dust, there is an environmentally friendly advantage to prevent environmental pollution by industrial waste.

1 is a graph showing the relationship between world Portland cement production and atmospheric carbon dioxide concentration

Figure 2 is a photograph for explaining the results of the uniaxial compression test of the inorganic binder for ground grout and filler according to an embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail, and reference to configurations and actions easily understood by those skilled in the art of manufacturing inorganic binders for ground grouts and fillers will be briefly or omitted.

Inorganic binder for ground grout and filler according to an embodiment of the present invention is 15 to 25% by weight of cement, 50 to 75% by weight of fly ash, 9 to 20% by weight of bypass dust and water-soluble polymer It is characterized by consisting of 1 to 5% by weight.

As the cement used in the present invention, cements such as portland cement and crude steel cement, which are usually used for ground grout and inorganic binders for fillers, may be used. The amount of the cement used may be 25 wt% or less, preferably 15 to 25 wt%. use.

When the amount of the cement used is less than 15% by weight, there is a fear that the ground grout and the inorganic binder for the filler may not be formed, and when the amount of the cement exceeds 25% by weight, the effect of soil improvement as a solidified material is reduced, Contact is prevented, and in the production of cement, by emitting a large amount of carbon dioxide not only becomes an environmental problem, there is a problem of depleting resources such as limestone.

The fly ash used in the present invention replaces the reduced cement, and not only solves environmental problems such as carbon dioxide generation due to excessive use of conventional cement and resource depletion due to excessive limestone extraction, but is also added to the minimum. It is to improve the strength and durability of the inorganic binder by filling the voids of cement. In general, coal dust contained in the waste gas discharged during the high temperature combustion process of about 1400 ° C is used by a dust collector using pulverized coal as a fuel in a combustion boiler such as a thermal power plant. Recover.

At this time, the use amount of the fly ash is preferably 50 to 75% by weight, if less than 50% by weight, it will not realize the advantages, such as the reduction of the amount of cement used by the fly ash, improved water-tightness, exceed 50% by weight In the case of long-term age, the strength is significantly increased, but there is a problem that the initial strength in the early age falls.

The reason for this is that fly ash itself has low reactivity, so its strength is low in early age, but in long-term age, the fly ash is gradually combined with calcium hydroxide dissolved in water in ready-mixed concrete to produce insoluble stable calcium silicate hydrate (Pozolan reaction). )

On the other hand, the fly ash is preferably processed to have a powder degree of 4000 ~ 5000 ㎠ / g by the refined grinding process, when the powder degree is less than 4000 cm 2 / g, than the fly ash having a powder degree of less than There is a problem that the effect of improving the watertightness is insufficient, there is a problem that must be increased if the amount exceeds 5000 cm 2 / g.

Bypass dust used in the present invention, by replacing the reduced cement with the fly ash, not only solves the environmental problems such as carbon dioxide generation due to the excessive use of conventional cement and resource depletion due to excessive limestone extraction In order to improve the strength and durability of the inorganic binder by filling the pores of the cement is added to the minimum, usually installed in the inlet portion of the cement kiln (calcination furnace), mainly collecting volatiles generated from the cement kiln Dust generated from the bypass precipitator, which is about 7-10% of the cement production.

On the other hand, the bypass dust is a 6,000 ~ 10,000 ㎠ / g ultra-fine particles containing a large amount of alkali and chloride, and has a curing property like ordinary cement, can act as an alkali stimulator of slag, in particular, the bypass The chloride component contained in the dust can promote the hydration of the fly ash to improve its strength.

At this time, the use amount of the bypass dust is preferably 9 to 20% by weight, and if less than 9% by weight, it is impossible to realize the advantages such as the reduction of the amount of cement used by the bypass dust and the improvement of watertightness. If exceeded, as the amount of the fly ash is reduced, there is a problem in that the strength and durability are not improved compared to the increase in the amount of the bypass dust.

The water-soluble polymer is added to improve the workability, cohesion and water retention, durability, and the like of the inorganic binder, and at least one selected from polyacrylate, cellulose, polyvinyl alcohol or polyacrylamide, Can be used.

Specifically, the workability can be improved by adjusting the viscosity of the inorganic binder by the surfactant activity, and the improvement of the cohesiveness and water retention due to the sealing effect due to the formation of a thin polymer film can also be expected.

In addition, in addition to adjusting the viscosity, the polyacrylate may serve to seal voids between the compositions when cured, thereby inhibiting the penetration of impurities and thereby improving durability.

At this time, the amount of the water-soluble polymer is preferably 1 to 5% by weight of the water-soluble polymer, when less than 1% by weight, it is not possible to implement the above effects, when it exceeds 5% by weight, the improvement of the effect compared to the amount of use is insufficient. There is a problem.

Hereinafter, the present invention will be described in detail with reference to the following examples, but are not necessarily limited to the examples.

1. Inorganic binder for ground grout and filler

(Example 1)

15 wt% cement, 75 wt% fly ash, 9 wt% bypass dust and 1 wt% water soluble polymer were mixed to prepare an inorganic binder for ground grout and filler.

(Example 2)

25 wt% cement, 50 wt% fly ash, 20 wt% bypass dust and 5 wt% water soluble polymer were mixed to prepare an inorganic binder for ground grout and filler.

(Comparative Example 1)

Inorganic binders for ground grout and fillers were prepared by mixing 60% by weight of Portland cement, 5% by weight of quicklime, 15% by weight of sand and 20% by weight of seawater.

2. Evaluation of inorganic binder for ground grout and filler

The soil of the ground to which the inorganic binder according to Examples 1 and 2 and Comparative Examples 1 and 2 was applied was collected, and the uniaxial compressive strength was measured according to the Korean Industrial Standard KS F 2314 (uniaxial compressive test of soil). It is shown in Table 2.

TABLE 2

	Uniaxial Compressive Strength MPa
	3 days of age	7 days of age	28 days of age
Example 1	2.5	4.0	6.0
Example 2	2.7	4.2	6.5
Comparative Example 1	1.0	2.0	3.0

As a result of the measurement, as shown in Table 2, Examples 1 and 2 according to the present invention can be seen that the uniaxial compressive strength is significantly superior to Comparative Example 1, which is used in the present invention, as shown in FIG. It is believed that the fly ash and bypass dust filled the pores of the cement to improve the strength and durability.

Therefore, the present invention can not only solve the environmental problems such as carbon dioxide generation and resource depletion due to excessive limestone extraction by reducing the amount of Portland cement, but also can prevent the environmental pollution caused by industrial waste by recycling industrial waste. In addition, it can be seen that excellent strength and durability can be realized compared to the inorganic binder using the conventional portland cement as a main raw material (mixed 50 wt% or more).

As described above, the superiority of the inorganic grout for the ground grout and the filler according to an embodiment of the present invention has been proved, but the present invention is not necessarily limited only by the above configuration, and does not depart from the spirit of the present invention. Many substitutions, modifications, and variations are possible.

The present invention is an inorganic binder for ground grout and filler, 15 to 25% by weight of cement, 50 to 75% by weight of fly ash, 9 to 20% by weight of bypass dust and 1 to 5 of water-soluble polymer. An inorganic binder for ground grout and a filler composed of weight% is used as an embodiment for carrying out the invention.

At this time, the fly ash preferably has a powder degree of 4000 ~ 5000 cm 2 / g.

The present invention is to reduce the use of Portland cement as much as possible, by replacing the use of circulating resources generated from the workplace waste to manufacture the inorganic grout for ground grout and fillers, reducing the amount of Portland cement and environmental problems such as carbon dioxide generation and excessive It can solve the problem of resource depletion due to limestone extraction, and apply fly ash, ultra-fine bypass dust as a recycling resource to replace the reduced Portland cement. By using a water-soluble polymer as an activator, a small amount of cement has a more compact structure by the inorganic binder composed as described above, which is why it is superior in strength compared to the inorganic binder using portland cement as the main raw material (mixed 50 wt% or more). And durability can be implemented, and as described above By recycling industrial wastes such as fly ash and bypass dust, it is possible to prevent environmental pollution by industrial wastes, so it is expected to be widely used in industry.

Claims

In the inorganic grout for ground grout and filler,

For ground grout and fillers comprising 15 to 25% by weight of cement, 50 to 75% by weight of fly ash, 9 to 20% by weight of bypass dust and 1 to 5% by weight of water-soluble polymer. Inorganic binder
The method of claim 1,

The fly ash is

Inorganic binder for ground grout and filler, characterized by having a powder degree of 4000 ~ 5000 ㎠ / g
The method of claim 1,

The water-soluble polymer,

Inorganic binder for ground grout and filler, characterized in that at least one selected from polyacrylate, cellulose, polyvinyl alcohol or polyacrylamide is used in combination.