Geopolymer composition and geopolymer hardened body

Abstract

To provide a geopolymer composition using an active filler that substitutes for fly ash and blast furnace slag.SOLUTION: A geopolymer composition comprises an active filler, an alkali activator, and water. The active filler comprises an amorphous silica powder and an Al-based inorganic powder consisting of at least one selected from the group consisting of γ-Al2O3, (SiO2)3 Al2O3, and Al(OH)3; and the alkali activator comprises an alkali metal silicate consisting of sodium silicate and / or potassium silicate, and an alkali metal hydroxide consisting of NaOH and / or KOH. Thus, a part or all of the active filler is substituted by a Si-based active filler and an Al-based active filler, thereby coping with a future instability in a supply of active fillers a fly ash and a blast furnace slag have.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to geopolimer compositions and cured geopolymers, and more particularly to geopolimer compositions using active fillers that replace fly ash and blast furnace slag, and cured geopolymers.

Background Art

[0002] Conventionally, geopolimer compositions that cure like concrete by treating amorphous materials with an alkaline solution have been known. In recent years, geopolimer compositions have attracted attention as cement alternative materials because they can significantly reduce the amount of CO2 generated during production compared to ordinary cement.

[0003] A cured geopolimer, which is a cured product of a geopolimer composition, has the following advantages compared to conventional concrete. (1) Heat resistance: While the heat resistance of conventional concrete is about 200°C, the heat resistance of the cured geopolimer is 600°C or higher. Therefore, it can also be used for incineration facilities and the walls of iron blast furnaces. (2) Acid resistance: It has higher acid resistance than conventional concrete. For this reason, it can be actively used for sewer pipes and the like. (3) Degree of freedom in selecting aggregates: In conventional concrete, the range of aggregate selection is limited due to the alkali-aggregate reaction, but there is no such restriction for cured geopolymers. Therefore, various aggregates can be selected, in other words, various waste materials and the like can be used as aggregates, which is suitable for environmental protection.

[0004] Note that since cement uses CaO from CaCO3, a large amount of CO2 is inevitably generated during production. In other words, substances using CaO as a raw material have to use CaCO3 as a starting material, so the by-production of CO2 is constantly accompanied.

[0005] As the active filler of the geopolimer composition, fly ash and / or blast furnace slag have conventionally been used. Here, both fly ash and blast furnace slag are Si—Al—Ca—O-based complex oxides and contain Ca3SiO5, which is the main phase of cement. For this reason, like cement, solidification assistance by a hydration reaction can be obtained, making it easy to handle.

[0006] As such a geopolimer composition, the following configurations have been proposed. For example, in Patent Document 1, (a) an aqueous alkali silicate solution containing at least one selected from the group consisting of an inorganic filler, sodium, and potassium, a retarder, a water reducer, and an antifoaming agent, (b) the inorganic filler includes fly ash and fine blast furnace slag powder, and the blending ratio of the fine blast furnace slag powder to the total inorganic filler is 45 to 90% by mass, (c) the blending ratio of the retarder to the total inorganic filler is 0.1 to 1.9% by mass, (d) the blending ratio of the water reducer to the total inorganic filler is greater than 0.2% by mass and 1.0% by mass or less a geopolimer composition is disclosed.

[0007] The same document describes that, while containing an appropriate amount of a retarder and a water reducer, since the blending ratio of the fine blast furnace slag powder to the total inorganic filler is within a predetermined range, it has good fresh properties and excellent initial strength.

[0008] Further, in Patent Document 2, (a) a geopolimer composition containing an active filler, an aggregate, water, an activator, and a dispersant, (b) the dispersant is a polycondensate-based dispersant containing polyalkylene glycol monophenyl ether as a partial structure, and its blending amount is 0.1% by mass to 2.0% by mass with respect to the total mass of the geopolimer composition, (c) The reactive filler contains, in a total amount of 85% by mass or more, unprocessed fly ash and blast furnace slag fine powder that do not conform to the standards for fly ash for concrete specified in JIS A 6201. A geopolimer composition is disclosed. The same document describes that it is possible to achieve both ensuring high fluidity over a long period of time and expressing high strength in a short period of time.

[0009] However, the following problems have been pointed out in order to continue using fly ash and blast furnace slag as reactive fillers in the future. (A) Since fly ash is a residue after coal combustion in thermal power plants, if the number of thermal power plants decreases for CO2 reduction, there is a risk that it will be difficult to obtain fly ash in the future. (B) Blast furnace slag is produced using CaCO3 as a raw material, but CO2 is generated when CaCO3 decomposes. Therefore, there is a possibility that an ironmaking process that reduces blast furnace slag for CO2 reduction will be developed, and there is a risk that it will be difficult to obtain blast furnace slag in the future.

[0010] For this reason, a geopolimer composition using a reactive filler that replaces fly ash and blast furnace slag and does not use CaO, which inevitably produces CO2 as a by-product, is desired.

Prior Art Documents

Patent Documents

[0011]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0012] The problem to be solved by the present invention is to provide a geopolymer composition using an active filler that substitutes fly ash and blast furnace slag. Another problem to be solved by the present invention is to provide a cured geopolymer using an active filler that substitutes fly ash and blast furnace slag.

Means for Solving the Problems

[0013] The gist of the present invention for solving the above problems is as follows.

[0014] [1] Containing an active filler, an alkali activator, and water, The active filler is amorphous silica powder, and Al-based inorganic powder composed of at least one selected from the group consisting of γ-Al2O3, (SiO2)3·Al2O3, and Al(OH)3, The alkali activator is an alkali metal silicate salt composed of sodium silicate and / or potassium silicate, and an alkali metal hydroxide composed of NaOH and / or KOH and containing a geopolymer composition.

[0015] [2] The geopolymer composition according to [1], wherein the content of the Al-based inorganic powder is 5.0 mass% or more and 50.0 mass% or less. However, the "content of the Al-based inorganic powder" refers to the ratio of the mass of the Al-based inorganic powder to the total mass of the amorphous silica powder and the Al-based inorganic powder.

[0016] [3] The geopolymer composition according to [1] or [2], wherein the content of the alkali metal silicate salt is 10 parts by mass or more and 30 parts by mass or less. However, the "content of the alkali metal silicate salt" refers to the mass of the alkali metal silicate salt when the total mass of the amorphous silica powder and the Al-based inorganic powder is 100.

[0017] [4] The content of the alkali metal hydroxide is 2 parts by mass or more and 6 parts by mass or less, and the geopolimer composition described in any one of [1] to [3]. However, the "content of the alkali metal hydroxide" refers to the mass of the alkali metal hydroxide when the total mass of the amorphous silica powder and the Al-based inorganic powder is 100.

[0018] [5] The content of water is 30 parts by mass or more and 60 parts by mass or less, and the geopolimer composition described in any one of [1] to [4]. However, the "content of water" refers to the mass of water when the total mass of the amorphous silica powder and the Al-based inorganic powder is 100.

[0019] [6] The content of CaO is 3 parts by mass or less, and the geopolimer composition described in any one of [1] to [5]. However, the "content of CaO" refers to the mass of CaO in terms of CaO conversion when the total mass of the amorphous silica powder and the Al-based inorganic powder is 100.

[0020] [7] The geopolimer composition according to any one of [1] to [6], including fine aggregate having a particle size of 5 mm or less.

[0021] [8] The geopolimer composition according to [7], further including coarse aggregate having a particle size exceeding 5 mm.

[0022] [9] The geopolimer cured product, which is a cured product of the geopolimer composition according to [7] or [8].

[0023]

[10] The geopolimer cured product according to [9], having a four-point bending strength of 5 MPa or more after 1 month of age. However, "after 1 month of age" means (1) The geopolymer composition is steam-cured in a mold at a temperature of 60°C and a relative humidity of 100% for 20 hours, (2) After demolding from the mold, it is heat-cured in the atmosphere at a temperature of 60°C for 20 hours, (3) Then, after further curing in the atmosphere for 1 month refers to The "four-point bending strength" refers to the four-point bending strength measured in accordance with JIS R 1601.

Advantages of the Invention

[0024] In the geopolymer composition according to the present invention, amorphous silica powder is used as the Si-based active filler, and an Al-based inorganic powder composed of at least one selected from the group consisting of γ-Al2O3, (SiO2)3·Al2O3, and Al(OH)3 is used as the Al-based active filler. In other words, part or all of the active filler is replaced by the Si-based active filler and the Al-based active filler. Thereby, it is possible to cope with the instability of the future supply of active fillers possessed by fly ash and blast furnace slag.

[0025] In addition, since fly ash and blast furnace slag vary greatly in composition, particle size, shape, etc. depending on the production time and location, there have been significant differences in the properties of the geopolymer composition and the geopolymer cured product using them. On the other hand, since the above Si-based active filler and Al-based active filler have stable components, etc., the properties of the geopolymer composition and the geopolymer cured product can be made more stable.

[0026] Furthermore, since the above Si-based active filler and Al-based active filler do not contain CaO, the potential generation of CO2 during the formation of CaO can be significantly suppressed.

Brief Description of the Drawings

[0027]

Figure 1

Mode for Carrying Out the Invention

[0028] Hereinafter, an embodiment of the present invention will be described in detail. The geopolimer composition according to the present invention contains an active filler, an alkali activator, and water.

[0029] [1. Geopolymer Composition] [1.1. Active Filler] The active filler is a powder that is active with respect to an alkali. When an alkali activator and water, which will be described later, are added, Si and Al in the active filler dissolve or ionize. After dissolution, a dehydration condensation reaction occurs between Si and Al that exist in the form of monomers (or in a state close to monomers) in the alkaline aqueous solution, forming a high molecular compound (polymer) (see Figure 1).

[0030] Here, the framework of ―O―Si―O―Al―O―Si―O― formed by the dehydration condensation reaction between Si and Al has Si 4+ substituted by Al 3+ Therefore, as a whole, it has a negative charge, and by incorporating alkali metal ions into the framework, electrical neutrality is maintained (see Figure 1).

[0031] The active filler according to the present invention includes amorphous silica powder as a Si-based active filler and at least one Al-based inorganic powder selected from the group consisting of γ-Al2O3, (SiO2)3·Al2O3, and Al(OH)3 as an Al-based active filler.

[0032] [1.1.1. Amorphous Silica Powder] The active filler according to the present invention uses amorphous silica powder as a Si-based active filler. The particle size, shape, etc. of the amorphous silica powder are not particularly limited, and the most suitable one can be appropriately selected according to the purpose. Also, the method for producing amorphous silica powder may be either a dry method (combustion method, arc method) or a wet method (precipitation method, gel method).

[0033] [1.1.2. Al-based inorganic powder] As the active filler according to the present invention, an Al-based inorganic powder composed of at least one selected from the group consisting of γ-Al2O3, (SiO2)3·Al2O3, and Al(OH)3 is used as the Al-based active filler. The particle size, shape, etc. of the Al-based inorganic powder are not particularly limited, and the optimum one may be appropriately selected according to the purpose. Note that, as the Al-based inorganic powder, any one of γ-Al2O3, (SiO2)3·Al2O3, or Al(OH)3 may be used alone, or a plurality of them may be used in combination.

[0034] Here, if the content of the Al-based inorganic powder is too small, the geopolimer composition may not cure, or the strength of the cured geopolimer may extremely decrease with the passage of time after placement. Therefore, the content of the Al-based inorganic powder is preferably 5.0 mass% or more, and more preferably 10.0 mass% or more. Note that the "content of the Al-based inorganic powder" refers to the ratio of the mass of the Al-based inorganic powder to the total mass of the amorphous silica powder and the Al-based inorganic powder.

[0035] On the other hand, if the content of the Al-based inorganic powder is too large, the formation of the framework may be incomplete and the geopolimer composition may not cure. Therefore, the content of the Al-based inorganic powder is preferably 50 mass% or less, and more preferably 35.0 mass% or less.

[0036] [1.2. Alkaline activator] The alkaline activator is a component that serves as a starting point for the polymerization by the dehydration condensation reaction of the active filler, and constitutes an alkaline aqueous solution that dissolves Si and Al.

[0037] The alkali activator according to the present invention comprises an alkali metal silicate consisting of sodium silicate and / or potassium silicate, and an alkali metal hydroxide consisting of NaOH and / or KOH.

[0038] [1.2.1. Alkali metal silicate] As the alkali metal silicate of the alkali activator according to the present invention, sodium silicate and / or potassium silicate is used. Note that, as the alkali metal silicate, either one of sodium silicate or potassium silicate may be used alone, or they may be used in combination.

[0039] If the content of the alkali metal silicate is too small, the geopolimer composition may not harden, or the strength of the geopolimer hardened product may extremely decrease with the passage of time after placement. Therefore, the content of the alkali metal silicate is preferably 10 parts by mass or more, and more preferably 15 parts by mass or more. Note that the "content of the alkali metal silicate" refers to the mass of the alkali metal silicate when the total mass of the amorphous silica powder and the Al-based inorganic powder is 100.

[0040] On the other hand, if the content of the alkali metal silicate is too large, the viscosity of the geopolimer composition may become too high, and the fresh properties such as fluidity may decrease. Also, the hardening speed may be fast, the pot life may be short, and placement may be difficult. Therefore, the content of the alkali metal silicate is preferably 30 parts by mass or less, and more preferably 25 parts by mass or less.

[0041] Note that, as the alkali metal silicate, it is preferable to use sodium silicate in view of the large circulation volume and easy availability. Thereby, the cost of the geopolimer composition and the geopolimer hardened product can be reduced.

[0042] [1.2.2. Alkali metal hydroxide] As the alkali activator according to the present invention, NaOH and / or KOH is used as the alkali metal hydroxide. In addition, as the alkali metal hydroxide, either one of NaOH or KOH may be used alone, or they may be used in combination.

[0043] If the content of the alkali metal hydroxide is too small, the pH may become too low and the reaction may not proceed, and the curing of the diopolymer composition may not progress. Therefore, the content of the alkali metal hydroxide is preferably 2 parts by mass or more, and more preferably 3 parts by mass or more. Note that the "content of the alkali metal hydroxide" refers to the mass of the alkali metal hydroxide when the total mass of the amorphous silica powder and the Al-based inorganic powder is 100.

[0044] On the other hand, if the content of the alkali metal hydroxide is too large, the pH may become too high, the reaction may proceed rapidly, and the pot life may be shortened. Therefore, the content of the alkali metal hydroxide is preferably 6 parts by mass or less, and more preferably 5 parts by mass or less.

[0045] As the alkali metal hydroxide, it is preferable to use NaOH in view of the large circulation volume and easy availability. Thereby, the costs of the diopolymer composition and the diopolymer cured product can be reduced.

[0046] [1.3. Water] Water contributes to the fluidity of the diopolymer composition. If the content of water is too small, the fluidity of the diopolymer composition may be insufficient, and it may be difficult to handle the diopolymer composition. Therefore, the content of water is preferably 30 parts by mass or more, and more preferably 38 parts by mass or more. Note that the "content of water" refers to the mass of water when the total mass of the amorphous silica powder and the Al-based inorganic powder is 100.

[0047] On the other hand, if the water content is too high, the viscosity of the geopololymer composition may be insufficient, making it difficult to handle the geopololymer composition. Therefore, the water content is preferably 60 parts by mass or less, and more preferably 48 parts by mass or less.

[0048] [1.4. CaO] In the present invention, CaO is an impurity. CaO is not actively added in the present invention. Therefore, the content of CaO is preferably 3 parts by mass or less, and more preferably 1 part by mass or less. Note that the "content of CaO" refers to the mass of CaO in terms of CaO conversion when the total mass of the amorphous silica powder and the Al-based inorganic powder is 100.

[0049] Here, the mass of CaO in terms of CaO conversion refers to the mass of CaO when it is assumed that Ca contained in the geopololymer composition exists as CaO, and the total mass of the amorphous silica powder and the Al-based inorganic powder is 100.

[0050] [1.5. Aggregate] The geopololymer composition according to the present invention may contain an aggregate. The geopololymer composition may be a geopololymer mortar composition containing fine aggregates with a particle size of 5 mm or less. The geopololymer mortar composition may further be a geopololymer concrete composition containing coarse aggregates with a particle size exceeding 5 mm.

[0051] [1.5.1. Fine Aggregate] The fine aggregate is not particularly limited as a material, and the most suitable one can be appropriately selected according to the purpose. Note that the particle size of 5 mm or less means that the particle size is 5 mm or less in 85% or more of the aggregate.

[0052] [1.5.2. Content of Fine Aggregate] The content of fine aggregate refers to the mass of fine aggregate when the total mass of amorphous silica powder and Al-based inorganic powder is 100.

[0053] The content of fine aggregate may be zero. Generally, a geopolymer hardened body containing fine aggregate has increased strength of the hardened body compared to the case without fine aggregate. Also, the generation of cracks can be suppressed during the shrinkage when forming the hardened body. For this reason, the content of fine aggregate is preferably 100 parts by mass or more, and more preferably 200 parts by mass or more.

[0054] On the other hand, if the content of fine aggregate is too much, the formation of the hardened body may not cover the whole, and partial hardened bodies may be formed. For this reason, the content of fine aggregate is preferably 400 parts by mass or less, and more preferably 300 parts by mass or less.

[0055] [1.5.3. Coarse aggregate] The coarse aggregate is not particularly limited as a material, and an optimal one can be appropriately selected according to the purpose. Note that the particle size exceeding 5 mm means that the particle size exceeds 5 mm in 85% or more of the aggregate.

[0056] [1.5.4. Content of coarse aggregate] The content of coarse aggregate refers to the mass of coarse aggregate when the total mass of amorphous silica powder and Al-based inorganic powder is 100.

[0057] The content of coarse aggregate may be zero. Generally, the more the content of coarse aggregate increases, the more the strength of the hardened body increases. Also, the generation of cracks can be more effectively suppressed during the shrinkage when forming the hardened body. Furthermore, the amount of fine aggregate that increases in cost can be reduced. For this reason, the content of coarse aggregate is preferably 100 parts by mass or more, and more preferably 200 parts by mass or more.

[0058] On the one hand, if the content of coarse aggregate is too high, the formation of the hardened body may not cover the whole, and partial hardened bodies may be formed. Therefore, the content of coarse aggregate is preferably 400 parts by mass or less, and more preferably 300 parts by mass or less.

[0059] [2. Geopolymer hardened product] The geopolymer hardened product according to the present invention is a hardened body of a geopolymer mortar composition or a geopolymer concrete composition.

[0060] [3. Characteristics of geopolymer hardened product] The geopolymer hardened product according to the present invention preferably has a four-point bending strength of 5 MPa or more after 1 month of age. The value of the four-point bending strength of 5 MPa is the strength of ordinary Portland cement-based concrete. If it has a four-point bending strength of this value or more, it can be used as an alternative to concrete. Note that the four-point bending strength of the geopolymer hardened product according to the present invention after 1 month of age can reach 10 MPa, 20 MPa or more by optimizing the composition.

[0061] Here, "after 1 month of age" means (1) The geopolymer composition is steam-cured in a mold at a temperature of 60 °C and a relative humidity of 100% for 20 hours, (2) After demolding from the mold, it is heat-cured at a temperature of 60 °C in the air for 20 hours, (3) Then, it is further cured in the air for 1 month and "Four-point bending strength" means the four-point bending strength measured in accordance with JIS R 1601.

[0062] [4. Action] In the geopolimer composition according to the present invention, amorphous silica powder is used as the Si-based active filler, and an Al-based inorganic powder composed of at least one selected from the group consisting of γ-Al2O3, (SiO2)3·Al2O3, and Al(OH)3 is used as the Al-based active filler. In other words, part or all of the active filler is replaced by the Si-based active filler and the Al-based active filler. Thereby, it is possible to cope with the instability of the future supply of active fillers possessed by fly ash and blast furnace slag.

[0063] In addition, since fly ash and blast furnace slag vary greatly in composition, particle size, shape, etc. depending on the production time and location, there have been significant differences in the properties of the geopolimer composition and the geopolimer cured product. On the other hand, since the above Si-based active filler and Al-based active filler have stable components, etc., the properties of the geopolimer composition and the geopolimer cured product can be made more stable.

[0064] Furthermore, since the above Si-based active filler and Al-based active filler do not contain CaO, the potential generation of CO2 during the formation of CaO can be significantly suppressed.

Example

[0065] (Examples 1 to 16, Comparative Example) [1. Preparation of Samples] [1.1. Active Filler] Amorphous silica powder and crystalline silica powder were used as the Si-based active filler. In addition, α-Al2O3, γ-Al2O3, (SiO2)3·Al2O3, and Al(OH)3 powder were used as the Al-based active filler.

[0066] [1.2. Alkaline Activator] As the aqueous solution of alkali metal hydroxide, an aqueous solution of NaOH with 38 mass% NaOH was used. Also, as the aqueous solution of alkali metal silicate, a solution prepared by diluting 138 g of an aqueous sodium silicate solution (water glass equivalent to JIS Class 1) with 86 g of ion-exchanged water was used.

[0067] [1.3. Aggregate] As the aggregate (fine aggregate), dried silica sand No. 7 (particle size of about 53 μm to 300 μm, SiO2 component of 90 mass% or more) was used.

[0068] [1.4. Water] Ion-exchanged water was used as the water.

[0069] [1.5. Cement (comparative example)] As a comparative example, commercially available Portland cement was used. Note that the water content refers to the mass of water when the mass of the cement is set to 100.

[0070] [1.6. Slurry (geopolymer composition)] After weighing each raw material in a stainless steel beaker, they were mixed by hand stirring for 1 minute to obtain a slurry (geopolymer composition). Note that the mass of the dried silica sand No. 7 of the aggregate was set to 24 g for all samples.

[0071] [1.7. Geopolymer cured product] Then, the obtained slurry was poured into a mold made of acrylic, (1) The slurry was steam-cured in the mold at a temperature of 60 °C and a relative humidity of 100% for 20 hours, (2) After demolding from the mold, it was heat-cured at a temperature of 60 °C in the air for 20 hours, (3) Then, after further curing in the air for 1 month, A geopolymer cured product was obtained. Then, the density (Archimedes method) and the four-point bending strength of the obtained geopolymer cured product were evaluated.

[0072] [2. Four-point bending strength] Here, although it is the flexural strength of four-point bending, due to the small sample size, the test was conducted in accordance with "Flexural Test Method for Fine Ceramics" JIS R 1601. The results are shown in Table 1.

[0073]

Table 1

[0074] [3. Results] (1) When crystalline silica powder was used as the Si-based active filler, it was found that the geopolimer composition did not form a cured body. Therefore, the evaluation of density and four-point flexural strength was not carried out. (2) Similarly, when α-Al2O3 powder was used as the Al-based active filler, it was found that the geopolimer composition did not form a cured body. Therefore, the evaluation of density and four-point flexural strength was not carried out.

[0075] (3) Also, when only amorphous silica powder was used as the active filler, a strong cured body was obtained at the stage where the geopolimer composition was steam-cured at a temperature of 60 °C and a relative humidity of 100% in the mold for 20 hours. However, it was found that the geopolimer cured product at the stage of heat-curing in the air at 60 °C for 20 hours after demolding from the mold, or at the stage of further curing in the air for 1 month thereafter, had extremely reduced strength and became brittle. Therefore, the evaluation of density and four-point flexural strength was not carried out.

[0076] Furthermore, it can be seen from Table 1 that the following can be known. (4) There are some cases where the four-point flexural strength is 20 MPa or more (11 MPa for the comparative example (Portland cement)) (Examples 1, 2, 4, 11). (5) When the Si-based active filler is relatively large, the four-point flexural strength may decrease (Examples 10, 13). (6) When the water content is relatively large, the four-point flexural strength may decrease (Examples 13, 15). Although the density of the geopolymer cured product is lower (less dense) than that of Portland cement, the four-point bending strength may be higher than that of Portland cement (Examples 1 to 9, 11, 14).

[0077] As described above, the embodiments of the present invention have been described in detail. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.

Industrial Applicability

[0078] The geopolymer composition and the geopolymer cured product according to the present invention can be used as infrastructure members for construction and building.

Claims

1. A dipolymer composition comprising an active filler, an alkali activator, and water, wherein the active filler is amorphous silica powder, γ-Al ２ O ３ 、(SiO ２ ) ３ ·Al ２ O ３ 、and at least one selected from the group consisting of Al(OH) ３ comprising an Al-based inorganic powder and the alkali activator comprises an alkali metal silicate salt consisting of sodium silicate and / or potassium silicate, and an alkali metal hydroxide consisting of NaOH and / or KOH and contains a dipolymer composition.

2. The dipolymer composition according to Claim 1, wherein the content of the Al-based inorganic powder is 5.0 mass% or more and 50.0 mass% or less. However, the "content of the Al-based inorganic powder" refers to the ratio of the mass of the Al-based inorganic powder to the total mass of the amorphous silica powder and the Al-based inorganic powder.

3. The dipolymer composition according to Claim 1, wherein the content of the alkali metal silicate salt is 10 parts by mass or more and 30 parts by mass or less. However, the "content of the alkali metal silicate salt" refers to the mass of the alkali metal silicate salt when the total mass of the amorphous silica powder and the Al-based inorganic powder is 100.

4. The dipolymer composition according to Claim 1, wherein the content of the alkali metal hydroxide is 2 parts by mass or more and 6 parts by mass or less. However, the "content of the alkali metal hydroxide" refers to the mass of the alkali metal hydroxide when the total mass of the amorphous silica powder and the Al-based inorganic powder is 100.

5. The dipolymer composition according to Claim 1, wherein the content of the water is 30 parts by mass or more and 60 parts by mass or less. However, the "content of the water" refers to the mass of the water when the total mass of the amorphous silica powder and the Al-based inorganic powder is 100.

6. The dipolymer composition according to Claim 1, wherein the content of CaO is 3 parts by mass or less. However, the "content of CaO" refers to the mass of CaO in terms of CaO conversion when the total mass of the amorphous silica powder and the Al-based inorganic powder is 100.

7. The dipolymer composition according to Claim 1, comprising fine aggregate having a particle size of 5 mm or less.

8. The dipolymer composition according to Claim 7, further comprising coarse aggregate having a particle size exceeding 5 mm.

9. A dipolymer cured product which is a cured body of the dipolymer composition according to Claim 7 or 8.

10. The dipolymer cured product according to Claim 9, having a four-point bending strength of 5 MPa or more after 1 month of age. However, "after 1 month of age" means (1) The geopolymer composition is steam-cured in a mold at a temperature of 60°C and a relative humidity of 100% for 20 hours, (2) After demolding from the mold, it is heat-cured in the atmosphere at a temperature of 60°C for 20 hours, (3) Then, after further curing in the atmosphere for one month means, The "four-point bending strength" refers to the four-point bending strength measured in accordance with JIS R 1601.

Images