Geopolymer composition and geopolymer cured body

Abstract

To provide a geopolymer composition capable of improving strength of a cured product.SOLUTION: A geopolymer composition contains an active filler (A), an alkali activator (B), and an aggregate (C). The aggregate (C) contains a first reactive aggregate (C1) having a SiO2 content of 40 mass% or more and a CaO content of 25 mass% or more. The aggregate (C) contains a second reactive aggregate (C2) having a Si ion elution amount of 15 ppm or more and a Ca ion elution amount of 5 ppm or more.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a geopolimer composition and a cured geopolimer body, and more particularly to a geopolimer composition and a cured geopolimer body suitable for building, civil engineering, and structural molding materials.

Background Art

[0002] Patent Document 1 describes a geopolimer composition containing an alkali silicate, an activating component capable of forming a geopolimer with the alkali silicate, and pulp fibers. Patent Document 1 states that this geopolimer composition can reduce the curing shrinkage of the cured product, so that the cured product can be made to the desired size.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In addition to making the cured product of the geopolimer composition to the desired size, it is required to increase its strength.

[0005] The present invention has been made in view of the above reasons, and it is an object of the present invention to provide a geopolimer composition and a cured geopolimer body capable of improving the strength of the cured product.

Means for Solving the Problems

[0006] The geopolimer composition of the present invention contains an active filler (A), an alkali activator (B), and an aggregate (C). The aggregate (C) contains a first reactive aggregate (C1) having a SiO2 content of 40% by mass or more and a CaO content of 25% by mass or more.

[0007] The geopolimer composition of the present invention contains an active filler (A), an alkaline activator (B), and an aggregate (C). The aggregate (C) contains a second reactive aggregate (C2) in which the elution amount of Si ions is 15 ppm or more and the elution amount of Ca ions is 5 ppm or more.

[0008] The geopolimer cured body of the present invention includes a cured product of the above-described geopolimer composition.

Effects of the Invention

[0009] According to the present invention, it is possible to provide a geopolimer composition and a geopolimer cured body capable of improving the strength of the cured product.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0011] [First Embodiment] Hereinafter, the geopolimer composition according to the first embodiment will be described. However, the following embodiment is only one of various embodiments of the present disclosure. The following embodiment can be variously modified according to design and the like as long as the object of the present disclosure can be achieved.

[0012] The geopololymer composition of the present invention contains an active filler (A), an alkali activator (B), and an aggregate (C). The geopololymer composition can produce a geopololymer by the reaction of the active filler (A) and the alkali activator (B). Then, by further proceeding the reaction for generating the geopololymer in the geopololymer composition, a cured product of the geopololymer composition can be obtained. Specifically, the "geopolymer" is a silicate polymer containing an aluminum element. Further, the geopololymer composition contains an aggregate (C) from the viewpoint of ensuring the strength of the cured product of the geopololymer composition. In particular, in the present embodiment, the aggregate (C) contains a first reactive aggregate (C1) having a SiO2 content of 40% by mass or more and a CaO content of 25% by mass or more. Thereby, the strength of the cured product of the geopololymer composition can be improved.

[0013] (Component) The components contained in the geopololymer composition will be described.

[0014] <Active filler> The geopololymer composition contains an active filler (A). As described above, the active filler (A) can produce a geopololymer by reacting with the alkali activator (B). In the present embodiment, the active filler (A) contains metakaolin. The content of the active filler (A) in the geopololymer composition is preferably 20% by mass or more and 35% by mass or less.

[0015] <Alkali activator> The geopololymer composition contains an alkali activator (B). The alkali activator (B) can change the liquidity of the geopololymer composition to alkaline. When the active filler (A) is placed under alkaline conditions, it can elute aluminum hydroxide (Al(OH)4) and silicic acid (Si(OH)4). Then, the aluminum hydroxide and silicic acid can produce a geopololymer by dehydration condensation under alkaline conditions.

[0016] The alkali activator (B) contains, for example, an alkali silicate. In this case, it is possible to easily generate a geopolimer. The alkali silicate contains at least one selected from the group consisting of, for example, sodium silicate, potassium silicate, and sodium metasilicate.

[0017] Also, the alkali activator (B) can contain an alkali metal salt. In this case, it is possible to easily maintain the alkalinity of the geopolimer composition at a high level. Thereby, it is possible to more easily generate a geopolimer. Examples of the alkali metal salt include sodium hydroxide and potassium hydroxide.

[0018] The mixing ratio of the alkali activator (B) to the active filler (A) is preferably 0.8 or more and 1.2 or less by mass ratio.

[0019] When blending the alkali activator (B) into the geopolimer composition, it may be blended as it is, or an aqueous solution in which the alkali activator (B) is previously dispersed or dissolved in water may be blended into the geopolimer composition. In addition, when water is contained in the geopolimer composition containing the active filler (A) in a dry state and the alkali activator (B) in a dry state, the generation of the geopolimer can be further promoted.

[0020] <Aggregate> The geopolimer composition contains an aggregate (C). Thereby, the strength of the cured product of the geopolimer composition can be ensured.

[0021] The aggregate (C) contains, for example, an oxide. Specifically, the aggregate (C) contains at least one oxide selected from the group consisting of SiO2, CaO, Al2O3, Fe2O3, SO3, and K2O.

[0022] In this embodiment, the aggregate (C) contains a first reactive aggregate (C1) having a SiO₂ content of 40% by mass or more and a CaO content of 25% by mass or more. Thereby, the strength of the cured product of the geopolimer composition can be improved. The reason why the strength of the cured product of the geopolimer composition can be improved by the aggregate (C) containing the above-described first reactive aggregate (C1) is presumed to be as follows. The first reactive aggregate (C1) has the above composition, and thereby is likely to have ionized atoms. Although the geopolimer has a hydroxyl group, the ionized atoms of the first reactive aggregate (C1) can chemically bond to the hydroxyl group of the geopolimer (see Fig. 1). Therefore, the first reactive aggregate (C1) and the geopolimer can be chemically adhered. As a result, it is presumed that the strength of the cured product of the geopolimer composition can be improved. The SiO₂ content in the first reactive aggregate (C1) is more preferably 40% by mass or more, and still more preferably 45% by mass or more. The CaO content in the first reactive aggregate (C1) is more preferably 25% by mass or more, and still more preferably 30% by mass or more.

[0023] Note that the SiO₂ content in the first reactive aggregate (C1) is preferably 70% by mass or less. In this case, a decrease in the strength of the geopolimer cured body can be suppressed. The SiO₂ content is more preferably 55% by mass or less. Further, the CaO content in the first reactive aggregate (C1) is preferably 55% by mass or less. In this case, it becomes difficult for calcium ions to remain in the geopolimer cured body, and it becomes difficult for efflorescence or the like to occur on the surface after curing. The CaO content is more preferably 45% by mass or less.

[0024] In addition, the content rate of Al2O3 in the first reactive aggregate (C1) is preferably 12% by mass or more. In this case, the first reactive aggregate (C1) is likely to have Al ions. As a result, the strength of the cured product can be further improved. This content rate is more preferably 5% by mass or more, and still more preferably 10% by mass or more. Further, the content rate of Al2O3 in the first reactive aggregate (C1) is preferably 20% by mass or less. In this case, it is easy to adjust the reaction rate in the formation of the geopolymers. Therefore, the strength of the cured product can be further improved. This content rate is more preferably 15% by mass or less.

[0025] The first reactive aggregate (C1) contains, for example, pulverized products of inorganic building materials. As a result, the strength of the cured product of the geopolymer composition can be further improved. The reason why the strength of the cured product of the geopolymer composition can be further improved by the first reactive aggregate (C1) containing pulverized products of inorganic building materials is presumably as follows. The pulverized products of inorganic building materials can have an appropriate amount of amorphous portions. The atoms contained in this amorphous portion are easily ionized. The ionized atoms in the amorphous portion and the hydroxyl groups in the geopolymer can be chemically bonded. As a result, it is presumed that the strength of the cured product can be further improved. Examples of the inorganic building materials include Colorvest (registered trademark), Neolock (registered trademark), Excelage (registered trademark), and the like.

[0026] The size of the particles contained in the aggregate (C) is preferably in the range of 0.05 mm or more and 15 mm or less. If the size of these particles is 0.05 mm or more, the geopolymer cured body can be given a design property. If the size of these particles is 15 mm or less, a decrease in the strength of the geopolymer cured body can be suppressed. Further, the aggregate (C) having a particle size within the above range can be obtained using a sieve with a predetermined mesh size. This particle size is preferably 0.5 mm or more, and still more preferably 1 mm or more. This particle size is more preferably 10 mm or less, and still more preferably 5 mm or less.

[0027] The content rate of the first reactive aggregate (C1) with respect to the geopolimer composition is preferably 30% by mass or more and 80% by mass or less. When this content rate is 30% by mass or more, the strength of the cured product can be further improved. When this content rate is 80% by mass or less, the fluidity of the geopolimer composition can be more easily reduced. This content rate is more preferably 40% by mass or more. This content rate is more preferably 60% by mass or less.

[0028] In addition, the aggregate (C) may contain an aggregate different from the first reactive aggregate (C1) (hereinafter referred to as a non-reactive aggregate (C3)). The non-reactive aggregate (C3) can be expected to have effects such as decoration and dimensional stability. The non-reactive aggregate (C3) may contain SiO2 or CaO, but does not satisfy the composition of the first reactive aggregate (C1). Therefore, the non-reactive aggregate (C3) is less likely to have ionized atoms and is less likely to chemically adhere to the geopolimer compared to the first reactive aggregate (C1) (see Figure 2). Specifically, the non-reactive aggregate (C3) contains at least one selected from the group consisting of mica, silica, silica powder, rock powder, silica sand, crushed stone, and the like. The content rate of the non-reactive aggregate (C3) is preferably 50% by mass or less with respect to the aggregate (C). In this case, the strength of the cured product can be further improved.

[0029] <Other components> The geopolimer composition may contain an additive (D) in addition to the above active filler (A), alkali activator (B), and aggregate (C). The additive (D) contains at least one selected from the group consisting of, for example, a lightweight material, a reinforcing fiber, a thickener, and a coloring agent. For example, the content rate of the additive (D) with respect to the geopolimer composition may be within the range of 0% by mass or more and 2.0% by mass or less.

[0030] Examples of the lightweight material include inorganic foams such as perlite and shirasu balloon, and organic foams such as expanded polystyrene, polyvinylidene chloride foam, and acrylonitrile-based foam.

[0031] Examples of the reinforcing fibers include pulp fibers, vinylon fibers, polypropylene fibers, acrylic fibers, carbon fibers, hemp, and metal fibers. When the geopolimer composition contains the reinforcing fibers, the reinforcing fibers can reduce the curing shrinkage of the geopolimer composition and improve the strength of the cured product of the geopolimer composition.

[0032] Examples of the thickening agent include methyl cellulose, hydroxymethyl cellulose, and carboxymethyl cellulose.

[0033] Examples of the coloring agent include iron black, carbon black, and chromium oxide.

[0034] <Manufacturing method of geopolimer composition> The geopolimer composition can be prepared by mixing the above-mentioned components. From the viewpoint of increasing the strength of the cured product, it is preferable that the active filler (A) and the alkali activator (B) are uniformly dispersed in the geopolimer composition. When dispersing each component in the geopolimer composition, for example, a batch-type or continuous-type mixer can be used.

[0035] <Physical properties of cured product of geopolimer> The cured product of the geopolimer composition according to this embodiment has increased strength. Specifically, the maximum bending stress of the cured product is 1 MPa or more. By appropriately changing the above components, the maximum bending stress of the cured product can also be 2.5 MPa or more, or 5 MPa or more.

[0036] <Geopolimer cured body> By curing the above-described geopolimer composition, a geopolimer cured body containing a cured product of the geopolimer composition can be obtained. Specifically, a geopolimer cured body can be obtained by the following method. First, the geopolimer composition is filled into a mold. Subsequently, the geopolimer composition filled in the mold is subjected to normal temperature sealing or steam curing. Thereby, a cured product of the composition can be produced in the mold. Thereafter, by subjecting this cured product to a drying treatment, a geopolimer cured body having a shape corresponding to the shape of the mold can be obtained.

[0037] When producing a geopolimer cured body from a geopolimer composition, it is preferable to cure the geopolimer composition at 60°C under a sealed condition for 24 hours. Further, it is preferable to subject the cured product of curing to a drying treatment under the conditions of 60°C or higher and 105°C or lower. In this case, the production of the geopolimer can be sufficiently carried out. Thereby, the strength of the cured product of the geopolimer composition can be further increased, and as a result, the strength of the geopolimer cured body can be further increased.

[0038] <Application Examples of Geopolimer Cured Body> The geopolimer cured body can be used, for example, as a floor board material such as an OA floor material or an outer wall material.

[0039] In addition to the above, instead of cement or mortar, a geopolimer composition can be used. For example, when it is necessary to fill a gap in a structure such as a piled stone with cement or mortar as an adhesive, a geopolimer composition can be used as an adhesive instead of cement or mortar.

[0040] [Second Embodiment] Hereinafter, the geopolimer composition according to the second embodiment will be described. The description of the same configuration as that of the first embodiment will be omitted.

[0041] In this embodiment, the aggregate (C) contains a second reactive aggregate (C2) in which the elution amount of Si ions is 15 ppm or more and the elution amount of Ca ions is 5 ppm or more. Also in this case, the strength of the cured product can be improved. That is, the second reactive aggregate (C2) easily generates Si ions and Ca ions. And those ions can bind to the hydroxyl groups possessed by the geopolymers. Therefore, the second reactive aggregate (C2) and the geopolymer can be chemically adhered. As a result, the strength of the cured product can be improved. The elution amount of the Si ions is preferably 15 ppm or more, and more preferably 18 ppm or more. The elution amount of the Ca ions is preferably 5 ppm or more, and more preferably 10 ppm or more.

[0042] The elution amounts of Si ions and Ca ions eluted from the above second reactive aggregate (C2) can be confirmed by the following method. First, 0.5 g of the second reactive aggregate (C2) is put into 49.5 g of an aqueous potassium hydroxide solution (adjusted to about pH 13.2). Subsequently, the aqueous potassium hydroxide solution into which the second reactive aggregate (C2) has been put is stirred with a hot stirrer. The stirring is carried out under the conditions of a temperature of 30°C, a stirring speed of 300 rpm, and a stirring time of 3 hours. And after carrying out the stirring under the above conditions, the aqueous potassium hydroxide solution is recovered, and the concentration of each ion eluted in the aqueous potassium hydroxide solution is measured by ICP (inductively coupled plasma) optical emission spectrometry. By such a method, the elution amount of each metal ion of the second reactive aggregate (C2) can be confirmed. Since the elution amount of the metal ions can be confirmed by the method as described above, the second reactive aggregate (C2) elutes Si ions so that the content of Si ions in the aqueous potassium hydroxide solution becomes 15 ppm or more and elutes Ca ions so that the content of Ca ions becomes 5 ppm or more when stirred in the aqueous potassium hydroxide solution at 30°C for 3 hours.

[0043] In addition, the second reactive aggregate (C2) preferably has an elution amount of Al ions of 2 ppm or more. In this case, it becomes easier to generate Al ions from the second reactive aggregate (C2). Al ions can bind to the hydroxyl groups possessed by the geopolymers. Thereby, the strength of the cured product of the geopolymer composition can be further improved. The elution amount of Al ions can also be confirmed by the same method as the method for confirming the elution amounts of Si ions and Ca ions. That is, it can also be said that the second reactive aggregate (C2) preferably elutes Al ions so that the content of Al ions in the potassium hydroxide aqueous solution becomes 2 ppm or more when stirred in a 30°C potassium hydroxide aqueous solution for 3 hours. The elution amount of this Al ion is preferably 2 ppm or more, and more preferably 5 ppm or more. Further, the elution amount of this Al ion is, for example, 10 ppm or less. In this case, rapid curing of the geopolymer composition can be suppressed. Therefore, it is easy to increase the strength of the cured product.

[0044] Similar to the first reactive aggregate (C1), the second reactive aggregate (C2) can also contain pulverized products of inorganic building materials. The same inorganic building materials as those of the first reactive aggregate (C1) can be used.

[0045] The content of the second reactive aggregate (C2) in the geopolymer composition is preferably 30% by mass or more and 80% by mass or less. When this content is 30% by mass or more, the strength of the cured product can be further improved. When this content is 80% by mass or less, the fluidity of the geopolymer composition can be more easily reduced. This content is more preferably 40% by mass or more. This content is more preferably 60% by mass or less.

[0046] Note that also in this embodiment, the aggregate (C) may contain a non-reactive aggregate (C3). The non-reactive aggregate (C3) is an aggregate different from the second reactive aggregate (C2). Also in this embodiment, the content of the non-reactive aggregate (C) is preferably 50% by mass or less with respect to the aggregate (C), similar to the first embodiment.

[0047] [Modification Example] As the reactive filler (A), materials other than metakaolin can also be used. For example, fly ash and slag can be mentioned as the reactive filler (A).

[0048] The aggregate (C) may simultaneously contain a first reactive aggregate (C1) and a second reactive aggregate (C2). That is, the aggregate (C) can contain at least one of the first reactive aggregate (C1) and the second reactive aggregate (C2). At this time, the total content rate of the first reactive aggregate (C1) and the second reactive aggregate (C2) with respect to the geopolimer composition is preferably 30% by mass or more and 80% or less. More preferably, this content rate is 40% by mass or more. More preferably, this content rate is 60% by mass or less.

[0049] [Aspect] As is clear from the above-described embodiments, the present invention includes the following aspects.

[0050] The geopolimer composition in the first aspect contains a reactive filler (A), an alkali activator (B), and an aggregate (C). The aggregate (C) contains a first reactive aggregate (C1) having a SiO2 content rate of 40% by mass or more and a CaO content rate of 25% by mass or more.

[0051] According to this aspect, the strength of the cured product of the geopolimer composition can be improved.

[0052] The geopolimer composition in the second aspect is, in the first aspect, such that the Al2O3 content rate in the first reactive aggregate (C1) is 12% by mass or more.

[0053] According to this aspect, the strength of the cured product of the geopolimer composition can be further improved.

[0054] The geopolimer composition in the third aspect is, in the first or second aspect, such that the content rate of the first reactive aggregate (C1) with respect to the geopolimer composition is 30% by mass or more and 80% by mass or less.

[0055] According to this aspect, the strength of the cured product of the geopolimer composition can be further improved.

[0056] The geopolimer composition in the fourth aspect contains an active filler (A), an alkali activator (B), and an aggregate (C). The aggregate (C) contains a second reactive aggregate (C2) in which the elution amount of Si ions is 15 ppm or more and the elution amount of Ca ions is 5 ppm or more.

[0057] According to this aspect, the strength of the cured product of the geopolimer composition can be improved.

[0058] In the fifth aspect of the geopolimer composition, in the fourth aspect, the second reactive aggregate (C2) has an elution amount of Al ions of 2 ppm or more.

[0059] According to this aspect, the strength of the cured product of the geopolimer composition can be further improved.

[0060] In the sixth aspect of the geopolimer composition, in the fourth or fifth aspect, the content rate of the second reactive aggregate (C2) with respect to the geopolimer composition is 30% by mass or more and 80% by mass or less.

[0061] According to this aspect, the strength of the cured product of the geopolimer composition can be further improved, and the fluidity of the geopolimer composition can be reduced.

[0062] In the seventh aspect of the geopolimer composition, in any one of the first to sixth aspects, the aggregate (C) contains a pulverized product of an inorganic building material.

[0063] According to this aspect, the strength of the cured product of the geopolimer composition can be further improved.

[0064] The geopolimer cured body in the eighth aspect of the present invention includes a cured product of the geopolimer composition in any one of the first to seventh aspects.

Examples

[0065] Hereinafter, the present invention will be described with reference to examples.

[0066] (Preparation of Geopolymer Composition) The components shown below were blended at the ratios shown in Table 2 to prepare a geopolymer composition.

[0067] <Component> - Active filler #1: Metakaolin. Satitone-SP33 manufactured by KaMin. Average particle size 1.3 μm.

[0068] - Alkaline activator #1: Potassium water glass.

[0069] - Alkaline activator #2: Aqueous potassium hydroxide solution.

[0070] - Aggregate #1: Ground product of inorganic building material (ground product of Color Best manufactured by Kaymu Co., Ltd. SiO2 content 50.0% by mass. CaO content 31.4% by mass. Al2O3 content 10.7% by mass. Fe2O3 content 3.76% by mass. SO3 content 1.15% by mass. K2O content 0.71% by mass.). Particle size 1.18 mm to 4.75 mm.

[0071] - Aggregate #2: Ground product of inorganic building material (ground product of Neo Rock of Kaymu Co., Ltd. SiO2 content 46.2% by mass. CaO content 33.9% by mass. Al2O3 content 12.6% by mass. Fe2O3 content 2.84% by mass. SO3 content 1.29% by mass. K2O content 0.91% by mass.). Particle size 1.18 mm to 4.75 mm.

[0072] - Aggregate #3: Silica sand (UBE Silica Sand No. 1A manufactured by UBE Industries, Ltd. SiO2 content 92.6% by mass. CaO content 0.2% by mass. Al2O3 content 4.6% by mass. Fe2O3 content 0.62% by mass. SO3 content 0.07% by mass. K2O content 0.25% by mass.). Particle size 1.7 mm to 4.8 mm.

[0073] <Metal Ion Elution Amount> Under the following conditions, the metal ion elution amounts of the above aggregate #1, aggregate #2 and aggregate #3 were measured.

[0074] ·Measurement conditions 0.5 g of aggregate was added to 49.5 g of an aqueous potassium hydroxide solution (adjusted to a pH of about 13.2). Subsequently, the aqueous potassium hydroxide solution to which the aggregate was added was stirred with a hot stirrer. This stirring was carried out under the conditions of a temperature of 30°C, a stirring speed of 300 rpm, and a stirring time of 3 hours. After stirring under the above conditions, the aqueous potassium hydroxide solution was recovered, and the concentration of each ion eluted in the aqueous potassium hydroxide solution was measured by ICP (inductively coupled plasma) optical emission spectrometry. The results are shown in Table 1.

[0075] [Table 1]

[0076] (Method for producing a cured product of a geopolimer composition) The geopolimer compositions of each example and comparative example were filled into a mold, and the geopolimer composition in that state was cured by curing at a temperature of 60°C and in a sealed state for 24 hours to produce a cured product. Subsequently, this cured product was dried at 60°C to produce a cured product of the geopolimer (sample for evaluation). The size of the sample was 129.7 mm in length, 185 mm in width, and 5 - 6 mm in thickness. Note that for Comparative Example 1, a sample could not be produced.

[0077] (Physical properties of the cured product of the geopolimer composition) <Maximum bending stress> The samples of each example and comparative example were subjected to a three-point bending test using a testing machine (Autograph AGX-V2 manufactured by SHIMADZU Corporation) to measure the maximum bending stress. Regarding the measurement conditions, the test speed was 2 mm / min and the bending span was 150 mm. Five samples were prepared for each example, and the value was calculated by obtaining the average value of the five measurement results. The calculated values are shown in Table 2.

[0078] <Young's modulus> The Young's modulus was calculated from the slope of the straight-line portion in the elastic region of a graph (see Figure 3) showing the relationship between bending stress and bending strain when measuring the maximum bending stress in the samples of each example and comparative example. The calculated results are shown in Table 2.

[0079] <deflection amount> The deflection amount was confirmed by checking the displacement amount in the direction of the applied load when measuring the maximum bending stress in the samples of each example and comparative example. The results are shown in Table 2.

[0080] <oven-dry specific gravity> The samples of each example and comparative example were immersed in water in a water bath for 24 hours, and then the weight in water and the weight in the water-absorbed state were measured. After that, the samples were dried at 105°C for 24 hours and then the weight in the dried state was measured. The oven-dry specific gravity was calculated by dividing the weight in the dried state by the difference between the weight in the water-absorbed state and the weight in water. The weight in water was measured with a hanging scale. The measured values are shown in Table 2.

[0081] <water content> The initial weights of the samples of each example and comparative example were measured, and then the samples were dried at 105°C for 24 hours and then the weight in the dried state was measured. The water content was calculated from the weight in the initial state and the weight in the dried state. The measured values are shown in Table 2.

[0082]

Table 2

Claims

1. A geopolimer composition containing a reactive filler (A), an alkali activator (B), and an aggregate (C). The aggregate (C) contains a first reactive aggregate (C1) having a SiO ２ content of 40% by mass or more and a CaO content of 25% by mass or more.

2. The geopolimer composition according to Claim 1. The content of Al in the first reactive aggregate (C1) ２ O ３ is 12% by mass or more.

3. The content of the first reactive aggregate (C1) with respect to the geopolimer composition is 30% by mass or more and 80% by mass or less. The geopolimer composition according to Claim 1.

4. A geopolimer composition containing a reactive filler (A), an alkali activator (B), and an aggregate (C). The aggregate (C) contains a second reactive aggregate (C2) in which the elution amount of Si ions is 15 ppm or more and the elution amount of Ca ions is 5 ppm or more.

5. The elution amount of Al ions in the second reactive aggregate (C2) is 2 ppm or more. The geopolimer composition according to Claim 4.

6. The content of the second reactive aggregate (C2) with respect to the geopolimer composition is 30% by mass or more and 80% by mass or less. The geopolimer composition according to Claim 4.

7. The aggregate (C) contains a pulverized product of an inorganic building material. The geopolimer composition according to Claim 1 or 4.

8. A geopolimer cured body which is a cured product of the geopolimer composition according to Claim 1 or 4. ​ ​ ​

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