Method for producing geopolymer cured product, geopolymer cured product, method for producing geopolymer composition, and geopolymer composition

Abstract

Provided is a method for producing a geopolymer cured product that is resistant to freeze-thaw cycles and that prevents a decrease in fluidity of a geopolymer composition even when a large amount of fine blast furnace slag aggregate is used as an aggregate. The method for producing a geopolymer cured product is characterized by comprising: a first step of producing a geopolymer composition by mixing an aggregate containing fine blast furnace slag aggregate, a powder containing microfine blast furnace slag, an alkali metal solution, gluconic acid, and water; and a second step of curing the geopolymer composition produced in the first step, wherein the ratio (Si / M) of the mass of silicon (Si) contained in the geopolymer composition excluding the aggregate from the geopolymer composition to the mass of alkali metal (M) contained in the alkali metal solution is 1.6 ≤ Si / M ≤ 5.8, and the mass of alkali metal per unit volume contained in the geopolymer composition excluding the aggregate is 2.0 kmol / m 3 The above.

Description

Technical Field

[0001] This invention relates to a method for manufacturing geopolymer solidified products, geopolymer solidified products, a method for manufacturing geopolymer compositions, and geopolymer compositions. Background Technology

[0002] In recent years, as a solution to global warming, research has been conducted on materials used in concrete that minimize carbon dioxide (CO2) emissions during their manufacturing process. Previously, Portland cement was primarily used in concrete, but its manufacturing process generates significant amounts of CO2, posing a challenge. Therefore, geopolymers have gained attention as a technology for manufacturing concrete without using Portland cement.

[0003] Geopolymers are known to have a structure in which powders are bonded together using condensation polymers of silica as a binder. The complexes used in these geopolymers are primarily amorphous aluminum silicate powders and alkali metal solutions. The powders used can include kaolin, clay, fly ash, silica fume, blast furnace slag powder, etc., and the alkali metal solutions can include sodium hydroxide, potassium hydroxide, water glass, or potassium silicate, etc. Furthermore, by appropriately mixing admixtures into the aforementioned alkali metal solutions and then curing them, a cured product similar to that used in Portland cement can be obtained. Additionally, by adding coarse aggregate as aggregate, a cured product similar to that of concrete can be obtained.

[0004] In previous geopolymer studies, powders composed of a mixture of fly ash and blast furnace slag fines were commonly used as the aforementioned powder. Here, the fly ash and blast furnace slag fines are obtained in large quantities as byproducts of combustion furnaces and blast furnaces, and their use is ideal from the perspective of efficient resource utilization. However, in geopolymer research, regarding aggregates, natural materials such as sand, gravel, and crushed stone have been utilized, while studies using byproducts such as fine blast furnace slag aggregates are almost nonexistent. Therefore, there are few studies exploring the effects of geopolymer compositions using fine blast furnace slag aggregates on the setting time, strength, and freeze-thaw resistance of the geopolymer cured products made from such compositions.

[0005] Against this backdrop, methods for manufacturing geopolymer compositions and geopolymer admixtures, as shown below, have been proposed. For example, Patent Document 1 discloses a method for manufacturing a geopolymer composition by mixing a filler consisting of fly ash and blast furnace slag, an alkaline solution, and aggregate, and then curing it to solidify it. In the method described in Patent Document 1, a geopolymer composition is prepared by combining fly ash with at least 10% blast furnace slag micro-powder.

[0006] Furthermore, Patent Document 2 discloses an admixture for geopolymers that combines a shrinkage-reducing agent formed from an oxyalkylene alkyl ether compound and a shrinkage-reducing aid formed from an aliphatic hydroxycarboxylic acid compound. The admixture disclosed in Patent Document 2 is a geopolymer additive that uses fly ash and blast furnace slag micro-powders as powders and is used to adjust setting time, improve fluidity, and reduce drying shrinkage.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: Japanese Patent No. 6408454

[0010] Patent Document 2: Japanese Patent Application Publication No. 2017-202964 Summary of the Invention

[0011] The problem that the invention aims to solve

[0012] However, the aforementioned prior art has the following problems. In Patent Document 1, the amount of blast furnace slag powder relative to fly ash is small, resulting in a total of only 30% by volume of blast furnace slag powder relative to fly ash. Furthermore, the method for manufacturing the geopolymer composition described in Patent Document 1 was developed using only natural sand as fine aggregate. Thus, in the method for manufacturing the geopolymer composition described in Patent Document 1, if more than 30% by volume of blast furnace slag powder is added to the fly ash mixture, and further fine aggregates of blast furnace slag are used, there is a risk of increased reaction between the blast furnace slag powder and the alkaline solution, a significant decrease in the fluidity of the geopolymer composition, and a deterioration in workability.

[0013] Patent Document 2 discloses several shrinkage-reducing agents and reveals that they can reduce the drying shrinkage of geopolymer mortar. Here, an example is shown where river sand is used as fine aggregate and limestone crushed stone is used as coarse aggregate in the geopolymer solidified product. However, Patent Document 2 only conducted experiments on specific substances in the shrinkage-reducing agents and did not explore the freeze-thaw resistance of the geopolymer solidified product.

[0014] Patent documents 1 and 2 use natural sand as fine aggregate, but the use of natural materials raises concerns about the impact of resource depletion. From this perspective, alternatives to sand as fine aggregate have been explored. Blast furnace slag fine aggregate has been considered as one such alternative. However, since blast furnace slag fine aggregate has the same composition as blast furnace slag powder, it may react with alkali metal solutions, promoting solidification. Furthermore, by using blast furnace slag fine aggregate as fine aggregate, the fluidity of the geopolymer composition decreases during the manufacture of geopolymer solidified products, and air becomes more easily trapped, leading to bleeding. As a result, there is a risk of reduced freeze-thaw resistance and reduced compressive strength in the geopolymer solidified products.

[0015] The present invention was developed in view of the above-mentioned situation faced by the prior art. Its purpose is to provide a method for preventing the reduction of the fluidity of geopolymer compositions even when a large amount of blast furnace slag fine aggregate is used as aggregate. Moreover, it is possible to obtain geopolymer solids with strong freeze-thaw resistance, a method for manufacturing geopolymer solids, geopolymer solids, geopolymer compositions, and the method for manufacturing the same.

[0016] Methods for solving problems

[0017] The inventors of this application conducted repeated and careful research to solve the aforementioned problems faced by the prior art. As a result, they discovered that by mixing a geopolymer composition containing fine blast furnace slag aggregate, a powder containing micro-powdered blast furnace slag, an alkali metal solution, gluconic acid, and water as raw materials, and by setting the ratio of the mass of silicon (Si) contained in the geopolymer composition excluding the aggregate to the mass of alkali metal (M) contained in the alkali metal solution within a specified range, and setting the mass of alkali metal per unit volume contained in the geopolymer composition excluding the aggregate to be at least a specified amount, it is possible to manufacture a freshly mixed geopolymer composition with excellent properties containing a large amount of fine blast furnace slag aggregate. Furthermore, by curing the above-mentioned geopolymer composition, it is possible to manufacture a geopolymer cured product with properties similar to concrete and excellent freeze-thaw resistance. Thus, the present invention was developed.

[0018] The present invention is based on the above insights, and its main points are as follows. That is, the present invention proposes (1) and (2) as shown below.

[0019] (1) A method for manufacturing geopolymer solidified products, characterized in that it includes:

[0020] The first step of manufacturing a geopolymer composition by mixing aggregates containing fine blast furnace slag aggregates, powders containing micro-powdered blast furnace slag, alkali metal solution, gluconic acid, and water; and

[0021] A second step involves curing the geopolymer composition manufactured in the aforementioned first step.

[0022] The ratio (Si / M) of the mass of silicon (Si) contained in the aforementioned geopolymer composition excluding the aforementioned aggregate to the mass of alkali metal (M) contained in the aforementioned alkali metal solution is 1.6 ≤ Si / M ≤ 5.8, and...

[0023] The mass per unit volume of the aforementioned alkali metal contained in the geopolymer composition excluding the aforementioned aggregate is 2.0 kmol / m³. 3 above.

[0024] It should be noted that, regarding the method for manufacturing geopolymer cured products involved in this invention, the following are considered to be more preferred solutions:

[0025] (a) The aforementioned powder contains fly ash in a ratio of 40:60 to 100:0 based on the volume ratio of the aforementioned blast furnace slag micro powder to fly ash;

[0026] (b) As the fine aggregate in the aforementioned aggregate, the aforementioned fine aggregate contains more than 50% by volume of the aforementioned blast furnace slag fine aggregate.

[0027] Furthermore, the geopolymer solidified product involved in this invention is a geopolymer solidified product manufactured by the above-described geopolymer solidified product manufacturing method.

[0028] (2) The method for manufacturing the geopolymer composition involved in this invention is characterized in that it is a method for manufacturing a geopolymer composition by mixing aggregate containing fine blast furnace slag aggregate, powder containing blast furnace slag micro powder, alkali metal solution, gluconic acid and water.

[0029] The ratio (Si / M) of the mass of silicon (Si) contained in the aforementioned geopolymer composition excluding the aforementioned aggregate to the mass of alkali metal (M) contained in the aforementioned alkali metal solution is 1.6 ≤ Si / M ≤ 5.8, and...

[0030] The mass per unit volume of the aforementioned alkali metal contained in the geopolymer composition excluding the aforementioned aggregate is 2.0 kmol / m³. 3 above.

[0031] Furthermore, the geopolymer composition involved in this invention is a geopolymer composition manufactured by the above-described method for manufacturing geopolymer compositions.

[0032] Invention Effects

[0033] According to the present invention, blast furnace slag fine aggregate can be used as fine aggregate in the geopolymer composition at a proportion of 50% by volume or more. By using blast furnace slag fine aggregate, a formulation that significantly improves freeze-thaw resistance, considered a weakness of geopolymers, can be produced. Furthermore, the method for manufacturing geopolymer solidified products of the present invention reduces the use of natural fine aggregates such as mountain sand, river sand, sea sand, and crushed sand manufactured in quarry plants, which are commonly used in geopolymers. Therefore, the geopolymer solidified product obtained by the method of manufacturing geopolymer solidified products of the present invention is a more environmentally friendly geopolymer solidified product. Attached Figure Description

[0034] [ Figure 1 [This is a flowchart illustrating a method for manufacturing geopolymer solidified products according to embodiments of the present invention.]

[0035] [ Figure 2 [This is a flowchart illustrating a method for manufacturing geopolymer solidified products according to embodiments of the present invention.] Detailed Implementation

[0036] [First Implementation Method]

[0037] Figure 1 and Figure 2 A flowchart illustrating the method for manufacturing geopolymer solidified products according to this embodiment is provided. Figure 1 A basic flow chart illustrating the manufacturing method of a geopolymer solidified product without coarse aggregate, where the geopolymer composition serves as a precursor for the solidified product. Figure 2 A basic flow chart illustrating the manufacturing method of a geopolymer solidified product when the geopolymer composition, which serves as a precursor to the solidified product, contains coarse aggregate. (See attached diagram.) Figure 1 and Figure 2 As shown, the method 100 for manufacturing geopolymer solidified material according to this embodiment includes: a first step 101 of mixing aggregate containing fine blast furnace slag aggregate, powder containing blast furnace slag micro powder, alkali metal solution, gluconic acid and water to manufacture a geopolymer composition; and a second step 102 of curing the geopolymer composition manufactured in the aforementioned first step. Each step will be described below.

[0038] <First step in manufacturing geopolymer compositions>

[0039] The method for manufacturing geopolymer solidified products in this embodiment includes a first step of mixing aggregate containing fine blast furnace slag aggregate, powder containing blast furnace slag micro powder or further mixed with fly ash, alkali metal solution, gluconic acid, and water to manufacture a geopolymer composition. The geopolymer solidified product manufactured by the method of this embodiment is obtained by curing the geopolymer composition. That is, the geopolymer composition manufactured in the first step is a precursor to the geopolymer solidified product. Here, geopolymer refers to a general term for amorphous polymers obtained by reacting alumina-silica powder such as blast furnace slag micro powder and fly ash with alkali-silica solutions such as sodium silicate aqueous solution and sodium hydroxide aqueous solution.

[0040] The raw materials for the geopolymer composition manufactured in the first process are powders mainly containing blast furnace slag micro powder (GGBF) or powders further containing fly ash (FA), alkaline solution, gluconic acid, and aggregates containing blast furnace slag fine aggregate (BFS). The following describes each component contained in the geopolymer composition manufactured in the first process.

[0041] (Powder)

[0042] The powder may contain silicic acid, silicon dioxide, aluminum oxide, and calcium oxide dissolved in alkaline solutions. The main component of the powder is a vitreous (amorphous) material that undergoes a geopolymer formation reaction in the presence of alkali. The silicon (Si) and aluminum (Al) contained in the powder as the main components are dissolved from the powder by the alkali contained in the alkaline solution and form geopolymers as silicon (Si)-silicon (Si) condensates through condensation reactions accompanied by dehydration.

[0043] The powder contains blast furnace slag fine powder (GGBF) as the main component. Specifically, the powder can be obtained by processing blast furnace water-quenched slag, a byproduct of pig iron production in a blast furnace. Alternatively, fly ash (FA) and silica fume (SF), byproducts of thermal power plants, can be further added to the powder. Specifically, the standard product specified in JIS A 6206:2013 can be used as the blast furnace slag fine powder. Furthermore, the standard product specified in JIS A 6201:2015 can be used as the fly ash (FA), for example.

[0044] Regarding the amount of powder contained in the in-situ polymer composition, in the absence of coarse aggregate, it is preferably adjusted to 500-900 kg / m³, based on the total amount of blast furnace slag powder (GGBF) and fly ash (FA). 3 If the powder mixing amount is 500 kg / m³ 3 The above describes a geopolymer composition suitable for manufacturing geopolymer cured products with excellent freeze-thaw resistance, and is therefore preferred. If the powder dosage is 900 kg / m³... 3 Therefore, no unreacted powder will be produced, which is preferable. Furthermore, regarding the amount of the powder, when incorporating coarse aggregate, the total amount of blast furnace slag fine powder (GGBF) and fly ash (FA) is preferably adjusted to 200–600 kg / m³. 3 It should be noted that the mixing ratio of blast furnace slag micro powder (GGBF) and fly ash (FA) in the powder can be appropriately set to ensure the setting start time and setting end time of the geopolymer composition. In this invention, a suitable geopolymer solidified product is obtained by optimizing the volume ratio of blast furnace slag micro powder (GGBF) to fly ash (FA) and the volume ratio of blast furnace slag fine aggregate in the fine aggregate. The volume ratio of each material can be calculated by dividing the unit volume mass of the mixing table by the density of each material. The density referred to here is the density specified in JIS R 5201:2015 for blast furnace slag micro powder (GGBF) and fly ash (FA), and the density specified in JIS A1109:2020 for fine aggregate.

[0045] Furthermore, the powder used in the first process is mainly composed of powder containing blast furnace slag micron powder (GGBF) or powder further containing fly ash (FA). However, without departing from the purpose of this invention, it may also contain other industrial byproducts such as metakaolin (a calcined clay mineral), rice husk ash, palm ash from burning oil palm residue, waste glass, municipal solid waste incineration ash, and sewage sludge incineration ash. Thus, the geopolymer composition produced in the first process is mainly composed of powder containing blast furnace slag micron powder or powder further containing fly ash (FA), and therefore, compared with cement concrete, it has the characteristics of higher silicon (Si) and aluminum (Al) content and lower calcium (Ca) content.

[0046] (Alkaline solution)

[0047] For alkaline solutions, aqueous solutions containing compounds with sodium hydroxide, potassium hydroxide, water glass, or potassium silicate are ideal. Geopolymers are cured by an alkaline source, therefore alkali metal compounds containing potassium or sodium are required. Regarding the amount of alkali metal compound, from the viewpoint of exhibiting strength in the geopolymer cured product, the moles of alkali metal (e.g., Na) per unit volume in the geopolymer cured product excluding aggregates is 2.0 kmol / m³. 3 The above usage is ideal. The reason is that if the moles of alkali metals (e.g., Na) per unit volume in the geopolymer composition are 2.0 kmol / m³, then... 3 In this way, the polymerization reaction of silicon (Si) proceeds fully, ensuring the freeze-thaw resistance and compressive strength of the geopolymer cured product obtained by curing the geopolymer composition.

[0048] The concentration of the alkaline solution used in the first step of manufacturing the geopolymer composition can be appropriately set taking into account the water content and the amount of alkali (OH) in the geopolymer composition. For example, an aqueous solution of sodium hydroxide (density 1.5 g / cm³) can be used. 3 In the case of an alkaline solution, the concentration of the sodium hydroxide aqueous solution can be set to 48% by mass. The unit water volume can be determined by taking into account the water contained in the alkaline solution, the gluconic acid solution, and the water generated in conjunction with the polycondensation reaction of silicon (Si).

[0049] The unit water consumption varies depending on the required strength, ranging from 100 to 300 kg / m³ without the use of coarse aggregate. 3 Adjusting the range is ideal. Additionally, when using coarse aggregate, the unit water content is 60–200 kg / m³. 3It is ideal to adjust the range of water content. The unit water volume can be determined taking into account the water content in alkaline solutions and gluconic acid solutions. If the unit water volume is above the lower limit of each range, the flowability of the polymer composition can be ensured, which is preferred. In addition, if the unit water volume is below the upper limit of each range, the decrease in compressive strength can be suppressed.

[0050] (aggregate)

[0051] The aggregate contained in the geopolymer composition includes fine blast furnace slag aggregate. The aggregate may also include other fine aggregates besides fine blast furnace slag aggregate. The aggregate may further include coarse aggregate. Regarding the aggregate used as a raw material for the geopolymer composition manufactured in the first step, aggregate containing fine blast furnace slag aggregate is used. Its particle size is preferably adjusted in a manner conforming to JIS A 5011-1:2018. This is because by including fine blast furnace slag aggregate in the aggregate, it is expected to reduce the drying shrinkage of the cured geopolymer. Furthermore, as the fine aggregate in the aggregate, it is preferable to include at least 50% by volume of fine blast furnace slag aggregate.

[0052] Regarding the amount of aggregate in a geopolymer composition, it is desirable to adjust the aggregate volumetric ratio (the volume of aggregate in the geopolymer composition) to be as high as possible. For example, when no coarse aggregate is included in the geopolymer composition, the aggregate volumetric ratio is expected to be 40% or higher. Conversely, when coarse aggregate is included in the geopolymer composition, the aggregate volumetric ratio is expected to be 60% or higher. Since the geopolymer cured product has a significant impact on drying shrinkage, increasing the aggregate volumetric ratio reduces the amount of geopolymer cured product, thereby reducing drying shrinkage. Increasing the coarse aggregate volumetric ratio is one common method for reducing the drying shrinkage of geopolymer cured product. Furthermore, coarse aggregate is generally readily available at low cost, and increasing the coarse aggregate volumetric ratio (the volume of coarse aggregate in the geopolymer composition) also lowers the price of the compound obtained by mixing the geopolymer composition components, making it more economical and preferred.

[0053] The water absorption rate of the fine aggregate is preferably 3.5% or less. If the water absorption rate of the fine aggregate is 3.5% or less, the quality of the geopolymer composition manufactured in the first process can be maintained uniformly, and therefore this is preferred. For the same reason, the surface dry density of the fine aggregate is expected to be 2.5 g / cm³. 3 above.

[0054] As coarse aggregate, blast furnace slag coarse aggregate, natural coarse aggregate commonly used in concrete, or coarse aggregate whose particle size has been adjusted to meet JIS standards can be used. For example, natural aggregates specified in JIS 1110:2020 can be used as coarse aggregate. For the same reasons as using the aforementioned fine aggregate, the water absorption rate of this coarse aggregate is expected to be 3.0% or less. Furthermore, the surface-dry density of the coarse aggregate is expected to be 2.5 g / cm³. 3 above.

[0055] (gluconic acid)

[0056] Furthermore, in the first step of the method for manufacturing geopolymer cured products according to this embodiment, the geopolymer composition produced contains gluconic acid as an additive to ensure its fluidity and delay curing. That is, the method for manufacturing geopolymer cured products according to this embodiment is characterized by containing gluconic acid as a precursor of the geopolymer cured product, i.e., a raw material for the geopolymer composition. Glucosamine is an aliphatic hydroxycarboxylic acid and has a curing-delaying effect on the geopolymer composition.

[0057] The geopolymer composition produced in the first process contains powders containing blast furnace slag micronized powder (GGBF) or further containing fly ash (FA), and blast furnace slag fine aggregate as raw materials. Therefore, if only conventional admixtures are added, the reaction between silicon (Si) and aluminum (Al) contained in the powders and blast furnace slag fine aggregate and the alkali in the alkaline solution increases, resulting in a large amount of geopolymer formation and a significant reduction in the fluidity of the geopolymer composition. The reduced fluidity of the geopolymer composition significantly reduces its workability. Consequently, it becomes difficult to use the geopolymer composition with reduced fluidity to produce the desired geopolymer cured product.

[0058] Regarding this point, in the method for manufacturing geopolymer solidified products according to this embodiment, gluconic acid, an aliphatic hydroxycarboxylic acid, can be added as an additive to the geopolymer composition manufactured in the first step, thereby improving the flowability of the geopolymer composition. The gluconic acid contained in the geopolymer composition is believed to be supplied by calcium ions (Ca) from the blast furnace slag micropowder contained in the geopolymer composition manufactured in the first step. 2+ Chelation and ion blocking inhibit reactions with alkali in alkaline solutions. As a result, the flowability of the geopolymer composition can be ensured, and the curing of the geopolymer composition can be delayed.

[0059] Using a gluconic acid aqueous solution (density 1.8 g / cm³) 3 When gluconic acid (at a mass percentage concentration of 50%) is used as a component of the geopolymer composition, it is expected to achieve a concentration of 0.1–60 kg / m³. 3The above-mentioned gluconic acid aqueous solution was used because the material cost of the geopolymer composition increased, the water content of the geopolymer composition increased, and the curing time of the geopolymer composition was delayed.

[0060] The geopolymer composition manufactured in the first process is characterized in that the ratio (Si / M) of the mass of silicon (Si) in the geopolymer composition excluding aggregates to the mass of alkali metal (M) in the alkali metal solution is within the range of 1.6 ≤ Si / M ≤ 5.8. If the ratio (Si / M) is less than 1.6, there is an excess of alkali solution, and the unreacted alkali solution reacts with carbon dioxide in the air to form basic carbonates and water. As a result, there is a risk of increased porosity and reduced freeze-thaw resistance in the geopolymer cured product, which is undesirable. On the other hand, if the ratio (Si / M) exceeds 5.8, the supply of alkali metal (e.g., Na) is insufficient, which risks a significant reduction in the compressive strength of the geopolymer cured product, which is also undesirable. It should be noted that as alkali metals, there are no particular restrictions as long as they are metals belonging to Group 1A, such as lithium, sodium, and potassium. From the perspective of operation and cost, sodium and potassium are preferred.

[0061] Furthermore, the geopolymer composition manufactured in the first process is characterized in that the mass of alkali metals per unit volume in the geopolymer composition, excluding aggregates, is 2.0 kmol / m³. 3 The above is the reason. It is because if the moles of alkali metals (e.g., Na) per unit volume in the geopolymer composition excluding aggregates are 2.0 kmol / m³, then... 3 In this way, the polymerization reaction of silicon (Si) proceeds fully, ensuring the freeze-thaw resistance and compressive strength of the geopolymer cured product obtained by curing the geopolymer composition.

[0062] (Mix and match)

[0063] The mixing process is carried out by placing the various materials mentioned above into various mechanical mixers for stirring and mixing. There are no particular limitations on the mixer used for mixing, as long as it can fully mix the various materials to produce a polymer composition through the polycondensation reaction of silicon (Si) and aluminum (Al). For example, mortar mixers (compliant with JIS R5201) used for cement concrete, disc mixers, forced twin-shaft mixers, etc., can be used for mixing.

[0064] For example, as part of this mixing process, it is preferable to feed powder containing blast furnace slag micro powder (GGBF) as an active filler, or powder further containing fly ash (FA), and aggregate containing blast furnace slag fine aggregate into the aforementioned mixer, pre-mix these materials by dry mixing, and then add an alkaline solution. Alternatively, the mixing can be carried out at both low and high speed stages.

[0065] <Second step in curing the geopolymer composition>

[0066] The method for manufacturing a geopolymer cured product according to this embodiment includes a second step of curing the geopolymer composition manufactured in the first step. The reason for this is that by curing the geopolymer composition, the reaction between the silicon (Si) and aluminum (Al) contained in the geopolymer composition and the alkali contained in the alkaline solution proceeds sufficiently, resulting in the production of a geopolymer cured product. The second step of curing the geopolymer composition is preferably performed by room temperature curing or steam curing. Room temperature curing can be gas curing (e.g., temperature 20°C, humidity 60% RH) or water curing (e.g., temperature 20°C). On the other hand, steam curing is preferably performed using a device capable of maintaining a specified temperature and humidity. It should be noted that, for the purpose of increasing the initial strength of the geopolymer cured product, gas curing as pre-curing and steam curing by applying heat with steam at 40–80°C can also be combined.

[0067] The geopolymer composition produced in the first step is filled into a mold. To facilitate the removal of the geopolymer composition from the mold, a release agent such as wax can be applied inside the mold. The mold can be made of the same metal as conventional concrete molds, such as wood or steel. Examples of release agents include petroleum wax, animal and plant waxes, mineral wax, and synthetic wax.

[0068] Regarding the curing period of the geopolymer composition filled in the mold, it should be appropriately set in a manner that allows the reaction between the silicon (Si), aluminum (Al), and calcium (Ca) contained in the geopolymer composition and the alkali contained in the alkaline solution to fully proceed, thus forming a solidified geopolymer. For example, the curing period of the geopolymer composition can be set to 1 day, 3 days, 7 days, 28 days, 91 days, etc., depending on the properties of the geopolymer composition. However, in actual construction and product manufacturing, considering productivity and construction period, a wet curing period of 5 to 9 days, similar to that of conventional concrete, is desirable.

[0069] In the method for manufacturing geopolymer cured products according to this embodiment, the geopolymer composition is cured in the second step to become a geopolymer cured product.

[0070] The method for manufacturing geopolymer solidified products according to the first embodiment improves the flowability (e.g., mortar flowability without coarse aggregate, slump or slump flowability with coarse aggregate) of the geopolymer composition used as a precursor for geopolymer solidified products, enhances its fresh mix properties, and enables the manufacture of geopolymer solidified products with significantly improved freeze-thaw resistance, a weakness of geopolymers. Furthermore, the method for manufacturing geopolymer solidified products according to the first embodiment avoids the use of natural fine aggregates typically used in geopolymer solidified products, thus preventing environmental damage and resulting in more environmentally friendly geopolymer solidified products.

[0071] [Second Implementation]

[0072] Next, a method for manufacturing geopolymer solidified products according to the second embodiment of the present invention will be described. The method for manufacturing geopolymer solidified products according to this embodiment is characterized in that the powder used in the first step of the method for manufacturing geopolymer solidified products according to the first embodiment contains fly ash in a volume ratio of blast furnace slag micro powder to fly ash of 40:60 to 100:0.

[0073] In the method for manufacturing geopolymer solidified products according to this embodiment, if the mixing ratio of blast furnace slag micropowder to fly ash is 40:60 by volume, the polycondensation reaction of silicon (Si) and other elements contained in the fly ash is promoted, which is preferred. Furthermore, if the mixing ratio of blast furnace slag micropowder to fly ash is 100:0 by volume, a large amount of blast furnace slag micropowder can be used, ensuring the settling start time and settling end time of the geopolymer composition, which is also preferred. Thus, since the geopolymer composition manufactured in the first step of this embodiment contains gluconic acid, even when using a powder containing a large amount of blast furnace slag micropowder as a powder, its flowability can be ensured, and the rapid solidification of the geopolymer composition can be delayed. In particular, the method for manufacturing geopolymer cured products in this embodiment sets the ratio of the mass of silicon (Si) contained in the geopolymer composition excluding aggregates to the mass of alkali metal (M) contained in the alkali metal solution within a specified range, and sets the mass of alkali metal per unit volume contained in the geopolymer composition excluding aggregates to a specified amount or more. Therefore, even when using powder containing a large amount of blast furnace slag micropowder as the powder and aggregate containing a large amount of blast furnace slag fine aggregate, its flowability can be ensured. Furthermore, the method for manufacturing geopolymer cured products in this embodiment can obtain geopolymer cured products with significantly improved freeze-thaw resistance by curing the aforementioned geopolymer composition.

[0074] According to the above-described method for manufacturing geopolymer solidified material in the second embodiment, by using a powder containing fly ash in a volume ratio of blast furnace slag micro powder to fly ash of 40:60 to 100:0, the setting start time and setting end time of the geopolymer composition can be adequately ensured, and a geopolymer composition with excellent workability can be obtained. Furthermore, a geopolymer solidified material with excellent freeze-thaw resistance can be manufactured as a secondary concrete product.

[0075] [Third Implementation Method]

[0076] Next, a method for manufacturing a geopolymer solidified product according to this embodiment will be described. The method for manufacturing a geopolymer solidified product according to this embodiment is characterized in that the fine aggregate contained in the geopolymer composition manufactured in the first step of the method for manufacturing a geopolymer solidified product according to the above embodiment contains 50% by volume or more of the aforementioned blast furnace slag fine aggregate.

[0077] As the fine aggregate in the aggregate of the geopolymer composition manufactured in the first step of the method for manufacturing geopolymer solids according to this embodiment, if the fine aggregate contains 50% or more of blast furnace slag fine aggregate, the freeze-thaw resistance of the geopolymer solids can be significantly improved, and a geopolymer solids with excellent durability, such as compressive strength, can be manufactured, which is therefore preferred. As the fine aggregate contained in the above-mentioned geopolymer composition, as long as the fine aggregate contains 50% or more of blast furnace slag fine aggregate, it is sufficient; therefore, the aggregate can also be 100% of blast furnace slag fine aggregate. In addition, as long as the fine aggregate contained in the above-mentioned geopolymer composition contains 50% or more of blast furnace slag fine aggregate, it can replace natural sand such as mountain sand, sea sand, and crushed sand manufactured in a quarry, and can make efficient use of a large amount of blast furnace slag, which is a by-product of pig iron production in the blast furnace, which is therefore preferred.

[0078] According to the above-described method for manufacturing geopolymer solidified products in the third embodiment, by including blast furnace slag fine aggregates of 50% by volume or more in the fine aggregates used in the first step, a more environmentally friendly geopolymer solidified product with significantly improved freeze-thaw resistance can be manufactured.

[0079] [Fourth Implementation Method]

[0080] This embodiment describes a geopolymer solidified product manufactured using the method described in the above embodiment. Specifically, the geopolymer solidified product of this embodiment is a solidified product with significantly improved freeze-thaw resistance, obtained by curing a geopolymer composition with excellent fresh-mixed properties (mortar flowability, slump, or slump flowability, etc.) using powder containing blast furnace slag micropowder (GGBF) or powder further containing fly ash (FA), and fine aggregate containing blast furnace slag fine aggregate as raw materials. Therefore, it can be used as a substitute for secondary concrete products. Consequently, the geopolymer solidified product of this embodiment can be used for: protection of decayed ditch slopes, building blocks / bricks, aquatic structures such as fish (algae) reefs, stabilization treatment of heavy metal contaminated soil, renovation of decayed pond dams, renovation of embankments and seepage barriers within road embankments, solutions for weak foundations, applications in box foundation construction methods, and solidification treatment of soft clay.

[0081] Furthermore, the geopolymer cured product of this embodiment has excellent fire resistance and is not prone to alkali-silica reaction.

[0082] In addition, the geopolymer solidified material of this embodiment has excellent freeze-thaw resistance, so it can be used as a building material for sleepers, outer groove blocks, U-shaped grooves, lane boundary blocks, airport apron paving, etc.

[0083] As explained above, in the geopolymer solidified product according to the fourth embodiment, the fine aggregate used as the fine aggregate in the aggregate that is the raw material of the geopolymer composition is a fine aggregate containing 50% by volume or more of blast furnace slag fine aggregate, thereby enabling the production of a geopolymer solidified product with significantly improved freeze-thaw resistance.

[0084] [Fifth Implementation Method]

[0085] A method for manufacturing the geopolymer composition according to the fifth embodiment will be described. The method for manufacturing the geopolymer composition of this embodiment is characterized by mixing fine aggregate containing blast furnace slag fine aggregate, powder containing blast furnace slag micro powder (GGBF) or powder further containing fly ash (FA), alkali metal solution, gluconic acid, and water to manufacture the geopolymer composition. The ratio (Si / M) of the mass of silicon (Si) contained in the geopolymer composition excluding the aggregate to the mass of alkali metal (M) contained in the alkali metal solution is set within a specified range, and the mass of alkali metal per unit volume contained in the geopolymer composition excluding the aggregate is set to a specified amount or more.

[0086] The method for manufacturing the geopolymer composition according to this embodiment can produce a geopolymer composition as a precursor for a geopolymer cured product. That is, the method for manufacturing the geopolymer composition according to this embodiment is equivalent to the first step of the method for manufacturing the geopolymer cured product described above. Since the geopolymer composition contains gluconic acid as an additive and contains a specified amount of alkali metal excluding aggregate, even a geopolymer composition containing fine aggregates that includes a large amount of blast furnace slag micro powder or further contains fly ash (FA) powder, and contains blast furnace slag fine aggregates of 50% by volume or more in all fine aggregates, can produce a geopolymer cured product with significantly improved freeze-thaw resistance without reducing the fluidity of the geopolymer composition.

[0087] As explained above, in the method for manufacturing the geopolymer composition according to the fifth embodiment, fine aggregate containing 50% by volume or more of blast furnace slag fine aggregate is used as the fine aggregate in the aggregate contained in the geopolymer composition, thereby enabling the manufacture of a geopolymer composition as a precursor of a geopolymer solidified product with significantly improved freeze-thaw resistance.

[0088] [Other Implementation Methods]

[0089] The present invention has been described above with reference to the embodiments described herein, but the present invention is not limited to the above embodiments. Various modifications that can be understood by those skilled in the art can be made regarding the structure and details of the present invention within the scope of the present invention.

[0090] Example

[0091] (Example 1)

[0092] The materials used as raw materials for the geopolymer composition in the method for manufacturing geopolymer cured products of the present invention are shown in Table 1. As shown in Table 1, powder, alkaline solution, fine aggregate, coarse aggregate, and additives were used as materials for the geopolymer composition used in the following examples. It should be noted that the symbols and physical properties of each material are shown together with the names of the materials in Table 1. Regarding the physical properties of the powder, the density (g / cm³) is shown. 3 ) and specific surface area (cm²) 2 Regarding the physical properties of alkaline solutions, the density (g / cm³) is shown. 3 The physical properties of fine aggregate, including density (g / cm³), are shown, along with mass percentage concentration (%). 3 The data includes the water absorption rate (%) and the density (g / cm³) of the admixture. 3 ) and mass percentage concentration (%).

[0093] [Table 1]

[0094]

[0095] The formulations of the geopolymer compositions without coarse aggregate are shown in Table 2. The geopolymer composition of Example 1 comprises powder, alkaline solution, fine aggregate, additives, and water. For the powder, a mixture of blast furnace slag fine powder (GGBF), fly ash (FA), and silica fume (SF) was used. In Example 1, to ensure a high content of GGBF contained in the powder, the volume ratio of GGBF to fly ash (FA) was set to 40:60. The fly ash (FA) used was Grade II ash possessing the standard quality for fly ash. Additionally, gluconic acid was used as an additive.

[0096] The mixing of the geopolymer composition materials was carried out in accordance with JIS R5201. Specifically, using a mortar mixer, specified amounts of water, sodium hydroxide, and gluconic acid were added, followed by silica fume (SF) and a powder containing blast furnace slag fine powder (GGBF) and fly ash (FA), and finally blast furnace slag fine aggregate (BFS) as fine aggregate. After mixing the materials of the geopolymer composition under specified conditions, the geopolymer composition was obtained. It should be noted that in Example 1, the ratio (Si / Na) of the amount of silicon (Si) contained in the geopolymer composition excluding the blast furnace slag fine aggregate as fine aggregate to the amount of sodium (Na) contained in the sodium hydroxide aqueous solution was set to 3.3, and the amount of sodium per unit volume was set to 2.9 kmol / m³. 3 Furthermore, the mortar flow value of the obtained geopolymer composition was determined (15 castings) to evaluate the fluidity of the geopolymer composition. Table 2 shows the composition of the geopolymer composition, its proportion, the ratio of the mass of silicon (Si) to the mass of sodium (Na) in the geopolymer composition excluding aggregate (Si / Na), and the mass of sodium per unit volume. In the geopolymer composition of Example 1, blast furnace slag fine aggregate (BFS) was used as aggregate at 100% of the raw material.

[0097] The results of the mortar flow value determination of the geopolymer composition obtained in Example 1, and the results of the freeze-thaw resistance and compressive strength determination of the geopolymer cured product obtained by curing the geopolymer composition are shown in Table 3. It should be noted that the mortar flow value determination of the geopolymer composition was performed in accordance with JIS R5201. Furthermore, the freeze-thaw resistance determination of the geopolymer cured product was performed in accordance with JIS A1148:2010. In addition, geopolymer cured product specimens were prepared in accordance with JIS A1132, and the compressive strength of the geopolymer cured product specimens was determined in accordance with JIS A1108.

[0098] (Examples 2-9)

[0099] As shown in Table 2, a geopolymer composition was manufactured by mixing materials in which gluconic acid was added as an admixture. In Examples 2-5, the ratio (Si / Na) of the mass of silicon (Si) to the mass of sodium (Na) produced from the aqueous sodium hydroxide solution was set to a range of 1.6 to 5.8, so that the mass of sodium per unit volume in the geopolymer composition excluding aggregates was 2.0 kmol / m³. 3 The geopolymer composition was prepared using the same method described above. Specifically, in Example 2, the Si / Na ratio was set to 2.2, and the molar mass of sodium per unit volume was set to 4.2 kmol / m³. 3 In Example 3, the Si / Na ratio was set to 4.9, and the amount of sodium per unit volume was set to 2.0 kmol / m³. 3 In Example 4, the Si / Na ratio was set to 1.6, and the amount of sodium per unit volume was set to 5.6 kmol / m³. 3 In Example 5, the Si / Na ratio was set to 4.8, and the amount of sodium per unit volume was set to 2.0 kmol / m³. 3 In Example 6, the Si / Na ratio was set to 2.8, and the amount of sodium per unit volume was set to 2.8 kmol / m³. 3 In Example 7, the Si / Na ratio was set to 1.6, and the amount of sodium per unit volume was set to 3.6 kmol / m³. 3 In Example 8, the Si / Na ratio was set to 2.2, and the amount of sodium per unit volume was set to 3.2 kmol / m³. 3 In Example 9, the Si / Na ratio was set to 2.0, and the amount of sodium per unit volume was set to 2.9 kmol / m³. 3 .

[0100] (Comparative Examples 1-4)

[0101] On the other hand, in Comparative Examples 1 to 4, the geopolymer composition was manufactured in the same manner as in Example 1, except that the ratio of the amount of silicon (Si) to the amount of sodium (Na) produced from the aqueous sodium hydroxide solution (Si / Na) was set to a range of 1.6 to 5.8. Specifically, in Comparative Example 1, the Si / Na ratio was set to 1.3, and the amount of sodium per unit volume was set to 6.6 kmol / m³. 3 In Comparative Example 2, the Si / Na ratio was set to 6.6, and the molar mass of sodium per unit volume was set to 1.5 kmol / m³. 3 In Comparative Example 3, the Si / Na ratio was set to 1.5, and the molar mass of sodium per unit volume was set to 5.9 kmol / m³. 3 In Comparative Example 4, the Si / Na ratio was set to 5.9, and the molar mass of sodium per unit volume was set to 1.7 kmol / m³. 3.

[0102] [Table 2]

[0103]

[0104] The mortar flow values ​​of the geopolymer compositions obtained in Examples 2-9 and Comparative Examples 1-4 were measured in the same manner as in Example 1. Furthermore, the freeze-thaw resistance and compressive strength of the geopolymer cured products obtained by curing the above-mentioned geopolymer compositions were measured in the same manner as in Example 1. The results of the mortar flow values ​​of the geopolymer compositions obtained in the above-mentioned examples and comparative examples, as well as the results of the freeze-thaw resistance and compressive strength of the geopolymer cured products, are shown in Table 3.

[0105] [Table 3]

[0106]

[0107] As clearly shown in Tables 2 and 3, the geopolymer composition obtained by using gluconic acid as a component exhibits good mortar flow value and excellent workability. Furthermore, the geopolymer cured product obtained from the above-mentioned geopolymer composition demonstrates excellent freeze-thaw resistance and sufficient compressive strength.

[0108] Generally, freeze-thaw resistance, which is a durability indicator of concrete, is considered to have a baseline of 60% or higher, especially in construction sites where a target of 80% or higher is desired. Furthermore, compressive strength, another durability indicator of concrete, is expected to be above 28 MPa.

[0109] In the geopolymer composition obtained in Example 1, the ratio (Si / Na) of the mass of silicon (Si) in the geopolymer composition excluding blast furnace slag fine aggregate as aggregate to the mass of sodium (Na) in the sodium hydroxide aqueous solution is 3.3, and the mass of sodium per unit volume is 2.9 kmol / m³. 3 Furthermore, the geopolymer cured product manufactured by curing the geopolymer composition obtained in Example 1 exhibits a freeze-thaw resistance of 95%. In contrast, the geopolymer composition obtained in Comparative Example 1 has a Si / Na ratio of 1.3 to the aforementioned (Na), and the sodium content per unit volume is 6.6 kmol / m³. 3 Furthermore, the freeze-thaw resistance of the geopolymer cured product manufactured by curing the geopolymer composition obtained in Comparative Example 1 is 30%.

[0110] A comparison of Example 1 and Comparative Example 1 shows that the ratio (Si / Na) of the mass of silicon (Si) in the geopolymer composition excluding aggregates to the mass of alkali metal (sodium) (Na) in the alkali metal solution (sodium hydroxide aqueous solution) is determined to be 1.6 ≤ Si / Na ≤ 5.8, and the mass of alkali metal (Na) per unit volume in the geopolymer composition excluding aggregates is 2.0 kmol / m³. 3 Therefore, it is possible to manufacture geopolymer cured products with excellent freeze-thaw resistance. Specifically, it is known that by using a ratio of the molar number of Si to the molar number of alkali metal in the geopolymer composition excluding aggregates of 1.6 ≤ Si / Na ≤ 5.8, and by making the mass of alkali metal (Na) per unit volume in the geopolymer composition excluding aggregates 2.0 kmol / m³, 3 The above-mentioned alkali metal aqueous solution can thus take into account both the freeze-thaw resistance and compressive strength of the geopolymer solidified product.

[0111] (Examples 10-16, Comparative Examples 5-8)

[0112] The geopolymer compositions of Examples 10-16 and Comparative Examples 5-8 comprise powder, alkaline solution, fine aggregate, additives, and water, and further comprise coarse aggregate. The compositional formulations of the geopolymer compositions using coarse aggregate are shown in Table 4. The coarse aggregate used was hard rock sand (G). The geopolymer compositions of Examples 10-13 shown in Table 4 correspond to the geopolymer compositions of Examples 1-4, and the geopolymer compositions of Comparative Examples 5-8 correspond to the geopolymer compositions of Comparative Examples 1-4, respectively. Regarding the component unit amounts of each element in the geopolymer compositions of Examples 10-13 and Comparative Examples 5-8, except for the coarse aggregate, they are set to be the same as the component unit amounts of each element in the geopolymer compositions of Examples 1-4 and Comparative Examples 1-4. Furthermore, the Si / Na ratio in the geopolymer composition excluding the aggregate and the amount of alkali metal (Na) per unit volume contained in the geopolymer compositions of Examples 10-13 and Comparative Examples 5-8 are set to be the same. Meanwhile, the flowability of the geopolymer compositions obtained in the above examples and comparative examples was evaluated by slump flow measurement and slump measurement, and the results are shown in Table 4. It should be noted that the slump flow value of the geopolymer compositions was measured in accordance with JIS A1150:2020.

[0113] [Table 4]

[0114]

[0115] In Examples 10-16, the molar ratio of Si to alkali metal in the geopolymer compositions excluding aggregates was 1.6 ≤ Si / Na ≤ 5.8, and the molar amount of alkali metal (Na) per unit volume in the geopolymer compositions excluding aggregates was 2.0 kmol / m³. 3 Regarding the above-mentioned alkali metal aqueous solutions, the slump flowability is the recommended 450–550 mm, and the flowability of the geopolymer composition is not a problem. On the other hand, in Comparative Examples 5–8, the slump flowability of the geopolymer compositions was either too low or too high, resulting in flowability problems.

[0116] (Examples 17 and 18)

[0117] In the method for manufacturing geopolymer solidified products of the present invention, in order to study the suitable blending ratio of blast furnace slag fine aggregate (BFS) and hard sandstone crushed sand (S) contained in the fine aggregate constituting the geopolymer composition, the geopolymer composition was manufactured by mixing based on the blending of Example 1 in Table 2 above, and by changing the blending ratio of blast furnace slag fine aggregate (BFS) and hard sandstone crushed sand (S). Specifically, in Example 17, the volume ratio (BFS ratio (%)) of blast furnace slag fine aggregate (BFS) contained in the aggregate formed by blast furnace slag fine aggregate (BFS) and hard sandstone crushed sand (S) was set to 75%. Furthermore, in Example 18, the above-mentioned BFS ratio (%) was set to 55%. After curing the geopolymer composition manufactured above, a geopolymer solidified product was manufactured. The freeze-thaw resistance of the obtained geopolymer solidified product was measured in the same manner as in Example 1.

[0118] (Compare Examples 9 and 10)

[0119] In Comparative Examples 9 and 10, the proportions of blast furnace slag fine aggregate (BFS) and hard sandstone crushed sand (S) in the fine aggregate were varied and the mixtures were kneaded to produce geopolymer compositions in the same manner as in Example 1. Specifically, in Comparative Example 9, the volume percentage (BFS ratio (%)) of blast furnace slag fine aggregate (BFS) in the fine aggregate formed from blast furnace slag fine aggregate (BFS) and hard sandstone crushed sand (S) was set to 45%. In Comparative Example 10, the BFS ratio was set to 20%. The geopolymer compositions produced were cured to produce geopolymer solids. The freeze-thaw resistance of the obtained geopolymer solids was determined in the same manner as in Example 1. Table 5 shows the composition, proportions, blast furnace slag fine aggregate (BFS) ratio, and freeze-thaw resistance test results of the geopolymer compositions produced in Examples 1, 17, 18, and Comparative Examples 9 and 10.

[0120] [Table 5]

[0121]

[0122] Table 5 shows the evaluation results of the freeze-thaw resistance of the geopolymer solidified product. When the proportion of blast furnace slag fine aggregate in the fine aggregate contained in the geopolymer composition is less than 50% by volume, the freeze-thaw resistance of the geopolymer solidified product is significantly reduced. Therefore, the proportion of blast furnace slag fine aggregate is expected to be 50% by volume or more. That is, as shown in Table 5, if the proportion of blast furnace slag fine aggregate in the fine aggregate contained in the geopolymer composition is 50% by volume or more, the freeze-thaw resistance of the geopolymer solidified product manufactured from the geopolymer composition can be significantly improved. Thus, the above examples show the following example: a geopolymer solidified product was manufactured by curing a geopolymer composition containing a powder of blast furnace slag micro powder and fly ash in a volume ratio of 40:60 to 100:0 and fine aggregate containing 50% by volume or more of blast furnace slag fine aggregate. In addition, the same result was obtained when coarse aggregate was used. Therefore, when coarse aggregate is used, it is also desirable to include 50% by volume or more of blast furnace slag fine aggregate in the fine aggregate.

[0123] Furthermore, from another perspective, the geopolymer solidified product manufactured by the method of the present invention uses a geopolymer composition containing fine aggregate comprising 50% by volume or more of blast furnace slag fine aggregate and blast furnace slag micro powder, a byproduct of molten iron production. Therefore, the method of the present invention for manufacturing geopolymer solidified products does not utilize the fine aggregate from nature commonly used in geopolymers, thus avoiding environmental damage and proving useful as a method for obtaining more environmentally friendly geopolymer solidified products.

[0124] Industrial availability

[0125] The method for manufacturing geopolymer solidified products of the present invention can improve the flowability of geopolymer compositions used as precursors for geopolymer solidified products, improve their fresh mix properties, and produce geopolymer solidified products with significantly improved freeze-thaw resistance. Therefore, the method for manufacturing geopolymer solidified products of the present invention is helpful to the development of industries such as civil engineering and construction, materials industry, and environmental industry, and is therefore industrially useful.

Claims

1. A method for producing a geopolymer cured product, characterized by, include: The first step of manufacturing a geopolymer composition by mixing aggregates containing fine blast furnace slag aggregates, powders containing micro-powdered blast furnace slag, alkali metal solution, gluconic acid, and water; and A second step involves curing the geopolymer composition manufactured in the first step. The fine aggregate in the aggregate comprises 50% by volume or more of the blast furnace slag fine aggregate. The ratio (Si / M) of the mass of silicon (Si) contained in the geopolymer composition excluding the aggregate to the mass of alkali metal (M) contained in the alkali metal solution is 2.0 ≤ Si / M ≤ 3.3, and... The amount of the alkali metal contained in the geopolymer composition excluding the aggregate is 2.8 to 4.2 kmol / m 3 .

2. The method for producing a geopolymer cured product according to claim 1, wherein The powder contains the fly ash in a volume ratio of 40:60 to 100:0, based on the volume ratio of the blast furnace slag micro powder to fly ash.

3. A geopolymer solidified product manufactured by the method for manufacturing geopolymer solidified products according to claim 1 or 2.

4. A method for producing a geopolymer composition, characterized by, Geopolymer compositions are prepared by mixing aggregates containing fine blast furnace slag aggregates, powders containing micro-powdered blast furnace slag, alkali metal solutions, gluconic acid, and water. The fine aggregate in the aggregate comprises 50% by volume or more of the blast furnace slag fine aggregate. The ratio (Si / M) of the mass of silicon (Si) contained in the geopolymer composition excluding the aggregate to the mass of alkali metal (M) contained in the alkali metal solution is 2.0 ≤ Si / M ≤ 3.3, and... The amount of the alkali metal contained in the geopolymer composition excluding the aggregate is 2.8 to 4.2 kmol / m 3 .

5. A geopolymer composition manufactured by the method of manufacturing the geopolymer composition according to claim 4.

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