KR20140008060A - The composite of non-cement based on blast furnace slag and fly ash, manufacturing method of dry mortar using the it - Google Patents

Abstract

The present invention relates to a zero cement composition based on blast furnace slag and fly ash and a manufacturing method of dry mortar using the same and, more specifically, to a zero cement composition and a manufacturing method of dry mortar using the same, wherein the zero cement composition has improved physical properties when compared with ordinary cement mortar using blast furnace slag and fly ash as a binder instead of cement and using calcium hydroxide, gypsum, and modified gypsum lime as an alkaline activator. [Reference numerals] (AA) Example 1; (BB) Example 4; (CC) Example 7

Description

The composite of non-cement based on blast furnace slag and fly ash, manufacturing method of dry mortar using the it}

The present invention relates to an economical and environmentally friendly blast furnace slag and fly ash based cement composition and dry mortar manufacturing method using the same for the purpose of energy saving and CO ₂ reduction in civil engineering, construction sites.

Recently, there is an urgent need for alternative measures to solve global warming such as carbon dioxide, greenhouse gas emission restriction, and energy saving.

In particular, the most widely used cement and cement secondary products in the civil and building industries are energy-consuming materials, and the steel industry is a major carbon dioxide emitter along with about 0.9 tons of carbon dioxide to produce 1 ton of cement.

Recently, the cement industry has been actively applied to blast furnace slag and fly ash as a study to replace cement using industrial by-products in order to reduce CO ₂ and satisfy various performance requirements of customers. .

  However, most of the related arts related to the composition of the cement have generally adopted a method of mixing blast furnace slag and fly ash, which are commercial by-products or generated by each region, alone or in a proportion, in a two-component system. And in the application as a secondary product (mortar, concrete) there is a limitation of the technology that the larger shrinkage characteristics appear in comparison with the dry shrinkage characteristics of the existing cement. When used for construction, such a building contract contains a very large potential risk factor in a house or a building when a person lives in it, and a very large potential risk factor such as the collapse of national infrastructure such as roads and dams when used for civil engineering. It includes.

In addition, most of the related arts related to alkali activators are mixed use of liquid water glass (sodium silicate), and the redundant construction procedure of quantitatively metering and mixing and adding additional alkali activators in actual field construction is required. It is necessary, and economically there is a lack of technology that can be put to practical use by using expensive water glass.

Most of the related arts related to alkali activators mainly include high-alkali-based inorganic chemicals such as NaOH, KOH, NA ₂ SiO ₃ , and NA ₂ SO ₄ . NaOH for each alkali activator has the general use limit due to high heat generation characteristics, and the compressive strength expression rate required for actual construction and civil engineering use is about 70 ~ 80% of the existing cement compressive strength. There is a part that falls short of the stability range.

In Korean Patent Registration No. 1011556390000 (20120605), a raw material mixture obtained by mixing and kneading liquid sodium silicate, which is the main raw material, with zinc oxide, aluminum hydroxide, diatomaceous earth, active kaolin, titanium dioxide, and a subsidiary material comprising magnesia, And 30% by weight of liquid sodium silicate, 15-30% by weight of zinc oxide, aluminum hydroxide of aluminum hydroxide, and aluminum hydroxide are mixed with 100% by weight of the raw material mixture. 10 to 20% by weight of diatomaceous earth, 10 to 20% by weight of diatomaceous earth, 5 to 10% by weight of active kaolin, 2 to 5% by weight of titanium dioxide and 2 to 7% by weight of magnesia are mixed and milled and pulverized; The additive is prepared by mixing 5 to 10 wt% aqueous solution of hydrochloric acid, 10 to 30 wt% aqueous solution of citric acid and 10 to 30 wt% aqueous solution of aluminum dihydrogenphosphate at a weight ratio of 1: 5: 1 to 2: 1 to 5, ≪ / RTI > Which is prepared by adding 5 to 25 parts by weight of the additive to 100 parts by weight of the raw material mixture, mixing and pulverizing the mixture, and a manufacturing method thereof.

Publication No. 1008330980000 (20080522) does not contain cement, which has 2080 parts by weight of sand, 2.030 parts by weight of silicic acid-based inorganic adhesive, 1.015 parts by weight of water-dispersible resin composition, and mortar composition. Has been described in the composition of mortar,

The publication No. 1007416370000 (20070714) discloses a method of producing a pre-mixed material by mixing A) 50 to 85% by weight of an aggregate and 15 to 50% by weight of a reactive powder; B) mixing the reactive agent with the reactive agent in an amount of 0.3 to 0.7 weight ratio of the reactive binder, 0.005 to 0.05 weight ratio of the high performance water reducing agent, and 0.2 to 1.0 weight ratio of the inorganic curing activator to the weight of the reactive binder, Thereby producing a mineral complex; C) molding the block using the mineral complex; D) natural curing at room temperature for 1 to 28 hours; E) 40 to 100 for 1 to 4 days, and discloses an environmentally friendly block without cement and a method for producing the same.

In Korean Patent Laid-Open Publication No. 1020120003133 (20120110), a raw material mixture prepared by mixing active sodium kaolin, sodium silicate, sodium carbonate, calcium carbonate, unsweetened talc, aluminum hydroxide, titanium dioxide, and magnesia, In order to improve the water resistance and adhesion strength, one of aqueous type modified SBR (styrene butadiene rubber) or additives such as modified acrylic resin or modified polyurethane resin or modified latex or modified EVA (Ethylene Vinyl Acetate) is selected and added Wherein the raw material mixture comprises 40 to 60 wt% of liquid sodium silicate, 15 to 25 wt% of active kaolin, 5 to 10 wt% of soda feldspar, 5 to 10% by weight of calcium, 5 to 10% by weight of talc, 5 to 10% by weight of aluminum hydroxide, 1 to 5% by weight of titanium dioxide, 1 to 5 of magnesia % Of the additive is mixed with a vertical mixer or a high-viscometric high-viscosity mixer. The mixture is then mixed with a high-viscosity mixer or a vertical mixer. And 0.3% by weight of the inorganic adhesive composition and mixing the same to improve the water resistance and the adhesive strength.

The publication No. 1020070056315 (20070604) discloses a ceramic fiber having a ratio of diameter to length after crushing of 1: 1 to 200, which is the same as the composition of ceramic paper, inorganic fibers, inorganic colloidal materials, It can be seen that an inorganic binder adhesive for a ceramic paper including a binder is disclosed.

1. Korean Registered Patent Publication No. 1011556390000 (20120605). 2. Korean Patent Registration No. 1008330980000 (20080522). 3. Korean Patent Registration No. 1007416370000 (20070714) 4. Korean Patent Laid-Open Publication No. 1020120003133 (20120110) 5. Domestic Published Patent Publication No. 1020070056315 (20070604)

In the present invention, in addition to the carbon dioxide emission problem, energy saving problem, and the like, the composition of the conventional cement and the secondary product (mortar, concrete) in the manufacturing method, the larger shrinkage in comparison with the dry shrinkage characteristics of the existing cement This study aims to solve very high potential risk factors such as collapse of national infrastructure such as roads and dams, and very high potential risk factors in houses and buildings when used for construction and civil engineering due to the limitations of the technology that is exhibited.

In addition, in the field of construction, which is generated by the conventional technology related to alkali activator, the redundant construction procedure of quantitatively weighing and mixing and adding additional alkali activators is necessary, and the expensive inorganic chemicals are also economical. The non-commercial part of using and mixing sodium hydroxide (NaOH) potassium hydroxide (KOH), sodium silicate (NA ₂ SiO ₃ ), calcium sulfate (CaSO ₄ ), etc. alone or in a certain ratio, depending only on high alkalinity Compression strength expression rate required for the actual construction and civil engineering use as well as general use restriction generated in technology is about 70 ~ 80% of the existing cement compressive strength, which is less than the range of strength stability that can be commercialized To solve this problem.

An object of the present invention is to solve the above-mentioned disadvantages and problems of the prior art in addition to the carbon dioxide emission problem, energy reduction problem, and the like, cement cement composition based on industrial by-product blast furnace slag or fly ash and dry mortar using the same It relates to a manufacturing method, and more specifically, blast furnace slag and fly ash as a main material as a binder instead of cement, and at least one anhydrous selected from natural anhydrous gypsum, flue gas desulfurization gypsum, chemical anhydrite gypsum in order to prevent dry shrinkage Based on cement composition including gypsum, general cement mortar by applying one or more slaked lime selected from slaked lime, modified lime (Ca (OH) ₂ 50-60% + CaSO ₄ 50-40%) as alkali activator Blast furnace slag and fly ash-based radish Cement composition and to a method for producing dry mortar using the same.

The present invention is environmentally friendly and has an effect of reducing the environmental load by utilizing the blast furnace slag and fly ash, which is an industrial by-product in terms of carbon dioxide and energy consumption generated during cement manufacturing,

By adding anhydrous gypsum with expansion performance to prevent the drying shrinkage of blast furnace slag and fly ash, it has the effect of reducing the risk factors of shrinkage that can occur when used in construction and civil works.

Initial reactivity and mixing by applying the method of mixing and grinding the blast furnace slag, fly ash and anhydrous gypsum in a dry grinder in a certain proportion to the problem of initial strength drop caused by the application of blast furnace slag and fly ash in comparison with the use of cement. Maximize efficiency, increase the initial strength,

The use of existing expensive inorganic chemicals as alkaline activators, the economical strength, high drying shrinkage, and other physical properties (compressive strength) problems, such as 70 ~ 80% of the compressive strength expression technology compared to the existing cement than equivalent level of cement There is an effect that can be replaced with.

1 is a photograph showing the degree of curing of the mortar according to an embodiment of the present invention.

The present invention relates to an economical and environmentally friendly blast furnace slag and fly ash based cement composition and dry mortar manufacturing method using the same for the purpose of energy saving and CO ₂ reduction in civil engineering and construction sites,

More specifically, from 75 to 95% by weight of blast furnace slag with powder of 4000 ~ 8000cm ² / g, 3 ~ 10% by weight of fly ash with powder of 3000 ~ 5000cm ² / g, natural anhydrous gypsum, flue gas desulfurization gypsum, chemical anhydrite gypsum A first step of producing blast furnace slag and fly ash based cementite composition having a powder level of 6000 to 10000 cm ² / g by mixing and pulverizing in a dry pulverizer with any one or more selected anhydrous gypsum 1-10% by weight; Cementite containing any one or more slaked lime selected from hydrated lime, modified lime (Ca (OH) ₂ 50-60% + CaSO ₄ 50-40%) as alkali activator in blast furnace slag and fly ash based cementite composition It is a composition, and modified lime is an alkali activator which is dried at 105 at constant temperature by digesting industrial by-product flue gas desulfurized lime in water at a temperature range of 25 for 1 hour, at least one of which is selected from 1 to 5% by weight. A second step of preparing a composition consisting of; In the dry mortar manufacturing method using the blast furnace slag and fly ash based cement composition, the second step blast furnace slag, fly ash based cement composition and alkali activator in a powder mixed composition having a particle size of less than 6.0mm 0.3 The present invention relates to a blast furnace slag and fly ash-based cementite composition, wherein a dry sand having a water content of less than% is mixed in a dry powder mixer in a weight ratio of 1: 3 to 1: 5, and a method of preparing a dry mortar using the same.

The blast furnace slag is a latent hydraulic material used as a general civil construction concrete mixing material by pulverizing the slag formed by quenching the molten slag suspended in the upper part of the blast furnace with water in the steelmaking process with water to grind the granulated slag with a mill, the alkali activator is added When the slag is stimulated, the self-curing property is used, and when the powder level is 4000cm ² / g or less, the hydration activity is lowered. When the powder is 8000cm ² / g or more, the hydration activity is increased, but the high powder In addition to the increase in manufacturing cost due to the problem, the workability is lowered and the heat of hydration is increased, so the appropriate level of powder is preferably 4000 to 8000 cm ² / g.

The fly ash is a particulate matter collected by a dust collector of pulverized coal combustion boilers among coal ashes generated from coal-fired thermal power plants, and is used as a mixed material in cement concrete. It is used as a pozzolanic material to improve strength and improve durability. Therefore, in order to increase the pozzolanic reactivity of the fly ash, it is preferable to grind and mix the fly ash powder degree to about 5000 cm ² / g. In addition, when the amount of the fly ash added is 10% by weight or more, it is preferable to mix within the range of 3 to 10% by weight presented in the present invention because of the problem that the initial strength is sharply reduced.

The natural anhydrous gypsum, flue gas desulfurization gypsum, chemical anhydrous gypsum serves to reduce the cracks due to dry shrinkage during curing in addition to the initial strength enhancement function in the cement composition, lacking the role of increasing the initial strength at less than 1% by weight, If it is 10% by weight or more, it is preferable to be mixed within the range of 1 to 10% by weight according to the present invention because there is a risk of strength degradation and expansion destruction due to late overexpansion.

In the present cement composition, the slaked lime is a material that serves as an alkali activator of the cement cement binder, and has a function of causing latent hydraulic expression of slag and pozzolanic reaction of fly ash by adding 1 to 5% by weight. In addition, since the strength is rather reduced and the amount of dry shrinkage is increased when it is added in the above addition amount range, it is preferred to be added within the range of 1 to 5% by weight.

In addition, as a material that can replace some of the anhydrous gypsum and hydrated lime, soaked flue gas desulfurized lime generated as an industrial by-product in water for 1 hour to digest, and then filtered to remove the dried lime (Ca (OH ) ₂ 50-60% + CaSO ₄ 50-40%) can be used, the addition of this modified lime (Ca (OH) ₂ 50-60% + CaSO ₄ 50-40%) slag in the cement composition And it serves to compensate for the dry shrinkage by giving strength expression function and expandability by the stimulating effect of the fly ash. When the appropriate amount of the modified lime (Ca (OH) ₂ 50-60% + CaSO ₄ 50-40%) is added 1 to 5% by weight of 5% by weight or more, the strength decreases due to overexpansion and expansion and destruction It is preferable to mix in the range suggested by the present invention because it may cause.

Hereinafter, embodiments of the present invention will be described, but these are for illustrative purposes only and do not limit the scope of the present invention.

Example 1

Fineness 4000cm ² / g of blast furnace slag 75kg of powder Fig 3000cm ² / g of fly ash 10kg, natural anhydrite 10kg, modified was digested for slaked lime 1kg, FGD gypsum-lime as alkali activation stimulant gypsum-lime (Ca (OH) ₂ 50 ~ 60% + CaSO ₄ 50 ~ 40%) 4kg mixed to prepare a blast furnace slag and fly ash based cement composition,

The blast furnace slag and fly ash based cementite composition and dry sand having a particle size of 6.0 mm or less and a water content of 0.3% or less are mixed at a speed of 60 rpm in a dry powder mixer at a weight ratio of 1: 3 for 120 seconds at a speed of 60 rpm. Dry mortar was prepared using the ash-based cementless composition.

Example 2

Fineness 4000cm ² / g of blast furnace slag 95kg, fineness 3000cm ² / g of fly ash 3kg, modified was digested for flue gas desulfurization gypsum-lime as natural anhydrite 1kg, alkali activation stimulant gypsum-lime _{(Ca (OH) 2 50 ~} 60 % + CaSO ₄ 50-40%) 1kg mixed to prepare a cement composition,

The blast furnace slag and fly ash based cementite composition and dry sand having a particle size of 6.0 mm or less and a water content of 0.3% or less were mixed at a speed of 60 rpm in a dry powder mixer at a weight ratio of 1: 5 at a speed of 60 rpm for 120 seconds. Dry mortar was prepared using the ash-based cementless composition.

Example 3

95 kg of blast furnace slag of 4000cm ² / g powder, 3kg fly ash of 3000cm ² / g powder, 1kg of natural anhydrous gypsum into powder of 6000cm ² / g in a dry mill, and then flue gas desulphurized lime as an alkali activator 1 kg of modified calcined lime (Ca (OH) ₂ 50 ~ 60% + CaSO ₄ 50 ~ 40%) was prepared to prepare blast furnace slag and fly ash based cement composition.

The blast furnace slag and fly ash based cementite composition and dry sand having a particle size of 6.0 mm or less and a water content of 0.3% or less are mixed at a speed of 60 rpm in a dry powder mixer at a weight ratio of 1: 3 for 120 seconds at a speed of 60 rpm. Dry mortar was prepared using the ash-based cementless composition.

Example 4

95 kg of blast furnace slag of 4000cm ² / g powder, 3kg of fly ash of 3000cm ² / g powder, 1kg of natural anhydrous gypsum into powder 8000cm ² / g in a dry mill, and then flue gas desulphurized lime as an alkali activation stimulant 1 kg of modified calcined lime (Ca (OH) ₂ 50 ~ 60% + CaSO ₄ 50 ~ 40%) was prepared to prepare blast furnace slag and fly ash based cement composition.

The blast furnace slag and fly ash based cementite composition and dry sand having a particle size of 6.0 mm or less and a water content of 0.3% or less are mixed at a speed of 60 rpm in a dry powder mixer at a weight ratio of 1: 3 for 120 seconds at a speed of 60 rpm. Dry mortar was prepared using the ash-based cementless composition.

Example 5

Fineness 8000cm ² / g of blast furnace slag 75kg, fineness 5000cm ² / g of fly ash 10kg, natural anhydrite 10kg, modified was digested for slaked lime 1kg, FGD gypsum-lime as alkali activation stimulant gypsum-lime (Ca (OH) ₂ 50 ~ 60% + CaSO ₄ 50 ~ 40%) 4kg mixed to prepare a blast furnace slag and fly ash based cement composition,

The blast furnace slag and fly ash based cementite composition and dry sand having a particle size of 6.0 mm or less and a water content of 0.3% or less are mixed at a speed of 60 rpm in a dry powder mixer at a weight ratio of 1: 3 for 120 seconds at a speed of 60 rpm. Dry mortar was prepared using the ash-based cementless composition.

Example 6

Fineness 8000cm ² / g of blast furnace slag 95kg, fineness 5000cm ² / g of fly ash 3kg, natural anhydrite 1kg to then in a dry mill powder is also mixed and pulverized to 8000cm ² / g, the flue gas by alkaline activation stimulant desulfurization gypsum-lime 1 kg of modified calcined lime (Ca (OH) ₂ 50 ~ 60% + CaSO ₄ 50 ~ 40%) was prepared to prepare blast furnace slag and fly ash based cement composition.

The blast furnace slag and fly ash based cementite composition and dry sand having a particle size of 6.0 mm or less and a water content of 0.3% or less were mixed at a speed of 60 rpm in a dry powder mixer at a weight ratio of 1: 5 at a speed of 60 rpm for 120 seconds. Dry mortar was prepared using the ash-based cementless composition.

Example 7

Fineness 8000cm ² / g of blast furnace slag 95kg, fineness 5000cm ² / g of fly ash 3kg, natural anhydrite 1kg to then in a dry mill powder is also mixed and pulverized to 10000cm ² / g, the flue gas by alkaline activation stimulant desulfurization gypsum-lime 1 kg of modified calcined lime (Ca (OH) ₂ 50 ~ 60% + CaSO ₄ 50 ~ 40%) was prepared to prepare blast furnace slag and fly ash based cement composition.

The blast furnace slag and fly ash based cementite composition and dry sand having a particle size of 6.0 mm or less and a water content of 0.3% or less were mixed at a speed of 60 rpm in a dry powder mixer at a weight ratio of 1: 5 at a speed of 60 rpm for 120 seconds. Dry mortar was prepared using the ash-based cementless composition.

Comparative Example 1

Dry cement mortar was prepared by mixing dry sand having a particle size of less than 6.0% and a water content of less than 0.3% with a weight ratio of 1: 3 in a dry powder mixer at a speed of 60 rpm for 120 seconds in a dry powder mixer.

Comparative Example 2

Fineness 4000cm ² / g of blast furnace slag powder and 80kg FIG 3000cm ² / g of fly ash 10kg, were mixed to prepare a powder composition of natural anhydrite 10kg and then, the powder composition and 6.0mm or less particle size to not more than 0.3% water having Dry sand having a content of 1: 3 was mixed in a dry powder mixer at a speed of 60 rpm for 120 seconds to prepare dry mortar.

Comparative Example 3

Fineness 4000cm ² / g of blast furnace slag powder and 95kg FIG 3000cm ² / g of fly ash 3kg, to alkali activation stimulant by mixing 2kg of calcium hydroxide to prepare a powder composition and then the composition has a powder particle size of less than 6.0mm and 0.3% Dry sand having a water content below was mixed in a dry powder mixer at a weight ratio of 1: 3 at a speed of 60 rpm for 120 seconds to prepare a dry mortar.

Experimental Example

After mixing 12.5% by weight of water with respect to the dry mortar prepared in order to compare the physical properties of mortar for Examples 1 to 7 and Comparative Examples 1 to 3, to the mechanical mixing method of hydraulic cement paste and mortar of KS L 5109 According to the mixing bibim, the compressive strength for each age was measured according to the strength test method of KS L ISO 679 cement.

The dry shrinkage rate was measured by filling each of the above water-mixed mortars in a mold of 40mm40mm160mm, remaining at temperature 202 and saturated humidity for 24 hours, demolding, measuring the initial length using a micrometer gauge, and measuring the standard temperature 202 and humidity 655. After curing for 28 days under the curing condition of%, the mortar length was measured, and the percentage of mortar shrinkage was calculated as a percentage.

Hereinafter, physical properties of Examples and Comparative Examples of the present invention are described in Table 1.

division Compressive strength (N / mm ² ) Length change rate (%) 3 days 7 days a year 28 days old Example 1 15.8 39.4 50.5 -0.06 Example 2 17.4 42.0 53.0 -0.04 Example 3 22.5 48.7 60.2 -0.06 Example 4 24.7 52.0 63.1 -0.08 Example 5 15.5 45.2 58.8 -0.05 Example 6 24.2 52.8 63.4 -0.06 Example 7 26.7 55.9 66.5 -0.08 Comparative Example 1 29.8 40.2 54.7 -0.08 Comparative Example 2 3.1 17.2 22.1 -0.06 Comparative Example 3 15.1 37.7 45.2 -0.14

Blast furnace slag and fly ash-based mortar physical properties prepared by changing the mixing composition of the present invention of Examples 1 to 7 and cement mortar physical properties of Comparative Example 1 and each component of the present invention of Comparative Examples 2 to 3 The physical properties of the composition were compared when a portion of the material was not mixed.

As shown in Table 1, the mortar compressive strengths of Examples 1 to 7 show more than equivalent strength expression characteristics compared with the cement mortar compressive strength of Comparative Example 1, and show a stable length change rate compared to cement mortar even in the length change. Giving.

As shown in Comparative Example 2, when the mixture of slaked lime and modified lime is not made in the blast furnace slag and the fly ash-based composition, the compressive strength is rapidly decreased.

On the other hand, as shown in Comparative Example 3 shows a high shrinkage length change rate in the blast furnace slag-based cement cement, it was shown that the length change is also reduced only if the composition is made within the mixing range of all of the composition additives presented in the present invention. ,

  This should be performed in the blast furnace slag and fly ash-based composition of the present invention must be mixed with hydrated lime, anhydrous gypsum and modified lime lime, and also in the amount of the mixture should be within the mixing range proposed in the present invention to have strength and stability of change in length. You can see the effect.

Claims (3)

For blast furnace slag and fly ash based cementless composition,
75-95% by weight of blast furnace slag with a powder degree of 4000-8000 cm ² / g,
3 to 10% by weight of fly ash powder is 3000 ~ 5000cm ² / g,
1 to 10% by weight of any one or more anhydrous gypsum selected from natural anhydrous gypsum, flue gas desulfurization gypsum, chemical anhydride gypsum,
Blast furnace slag and fly ash based cementite composition, characterized in that it is composed of 1 to 5% by weight of any one or more of the hydrated lime selected from hydrated lime, flue gas desulfurized lime as an alkali activator.
For blast furnace slag and fly ash based cementless composition,
75-95% by weight of blast furnace slag with a powder degree of 4000-8000 cm ² / g,
3 to 10% by weight of fly ash powder is 3000 ~ 5000cm ² / g,
1 to 10% by weight of one or more anhydrous gypsum selected from natural anhydrite, flue gas desulfurization gypsum, chemical anhydride gypsum,
The blast furnace slag and fly ash-based cementite composition, which is composed of 1-5 wt% of any one or more slaked lime selected from hydrated lime and flue gas desulfurized lime as an alkali activator, and powder of 6000-10000 cm ² / g .
In the method of manufacturing a dry mortar using blast furnace slag and fly ash based cement composition,
75-95% by weight of blast furnace slag with a powder degree of 4000-8000 cm ² / g,
3 to 10% by weight of fly ash powder is 3000 ~ 5000cm ² / g,
1 to 10% by weight of any one or more anhydrous gypsum selected from natural anhydrous gypsum, flue gas desulfurization gypsum, chemical anhydride gypsum,
As an alkali activator, a composition mixed with 1 to 5% by weight of any one or more of the hydrated lime selected from hydrated lime and flue gas desulfurized lime as an alkali activator is formed, and the powder composition has a particle size of 6.0 mm or less and less than 0.3% A dry mortar manufacturing method using a blast furnace slag and fly ash-based cementite composition, characterized in that the dry sand having a content of 1: 3 to 1: 5 in a dry powder mixer.

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