Geopolymer composition

Abstract

To provide a geopolymer composition capable of covering a steel frame.SOLUTION: The geopolymer composition 1 according to the present invention comprises a geopolymer raw material powder and an activator. The complex viscosity of the geopolymer composition measured at an angular frequency of 10 / sec after six minutes of the start of mixing the geopolymer raw material powder and the activator is more than 17.9 mPa s and less than 87.9 mPa s.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to geopolymer compositions. [Background technology]

[0002] Portland cement has traditionally been widely used as a non-flammable inorganic material, and lightweight cellular concrete, which is made primarily from silica, cement, and quicklime, with aluminum powder added as a foaming agent and cured with high-temperature, high-pressure steam in an autoclave, is well known.Lightweight cellular concrete takes advantage of its air-bubble structure and non-flammable properties to be used as a lightweight building material, fireproof insulation material, soundproofing material, and humidity-regulating material.

[0003] However, concrete is vulnerable to acids, and it is said that its strength decreases when heated above 500°C, so there are concerns about its use in applications where fire or acid is expected.

[0004] Geopolymers have been attracting attention in recent years as a technology for producing concrete that does not use Portland cement. Geopolymers are hardened products made by reacting alumina-silica powder with an alkaline solution, and the aluminosilicate structure at their core is known to be resistant to heat and acid.

[0005] Research has also been conducted into fire-resistant coating materials using geopolymers. For example, Patent Document 1 describes a fire-resistant coating material that is obtained by adding an alkaline solution to a mixture containing an active filler, an inactive filler, a lightweight fire-resistant aggregate, and a foaming agent, kneading the mixture, and curing the mixture. The density of the material is 1.0 g / cm. 3 The following geopolymer-based lightweight fire-resistant material is disclosed: [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2022-117872 Summary of the Invention [Problem to be solved by the invention]

[0007] With regard to conventional fire-resistant coating materials using geopolymers as described above, there is a demand for materials that can be used to practically coat steel frames.

[0008] The present invention aims to provide a geopolymer composition that can be practically coated onto steel frames. [Means for solving the problem]

[0009] To achieve the above object, the geopolymer composition of the first disclosure includes a geopolymer raw material powder and an activator, and has a complex viscosity, measured at an angular frequency of 10 rad / s, greater than 17.9 mPa·s and less than 87.9 mPa·s 5 minutes after the start of mixing the geopolymer raw material powder and the activator.

[0010] By using a geopolymer composition having a complex viscosity in this range, the steel frame can be coated with the hardened geopolymer composition to an appropriate thickness.

[0011] The geopolymer composition of the second disclosure is the geopolymer composition of the first disclosure, wherein the complex viscosity measured at an angular frequency of 100 rad / s 5 minutes after the start of mixing is lower than the complex viscosity measured at an angular frequency of 10 rad / s 6 minutes after the start of mixing, and the complex viscosity measured at an angular frequency of 1 rad / s 7 minutes after the start of mixing is higher than the complex viscosity measured at an angular frequency of 10 rad / s 6 minutes after the start of mixing. This allows the geopolymer composition to maintain its shape on the vertical surface of the steel frame until it hardens.

[0012] The geopolymer composition of the third disclosure is the geopolymer composition of the first or second disclosure, which includes an aggregate, wherein the aggregate is 60 parts by weight or less per 100 parts by weight of the geopolymer raw powder.

[0013] This makes it possible to impart fire resistance to the geopolymer composition. Also, if the amount of geopolymer raw material powder is too small, adhesion may become difficult, so the amount of aggregate is preferably 60 parts by weight or less.

[0014] The geopolymer composition of the fourth disclosure is the geopolymer composition of the first or second disclosure, wherein the geopolymer raw powder is metakaolin, which can impart excellent fire resistance to the geopolymer composition.

[0015] The geopolymer composition of the fifth disclosure is the geopolymer composition of the first disclosure, which is used in applications for coating steel frames.

[0016] This makes it possible to impart fire resistance to the steel frame. [Effects of the Invention]

[0017] As described above, the present invention can provide a geopolymer composition that can practically coat steel frames. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a diagram showing the state in which the surface of a steel frame is coated with a geopolymer composition according to an embodiment of the present invention. [Figure 2] FIG. 1 is a diagram illustrating a method for evaluating the adhesion of a geopolymer composition of an embodiment of the present invention to a steel frame. DETAILED DESCRIPTION OF THE INVENTION

[0019] The geopolymer composition according to an embodiment of the present invention will be described below.

[0020] (Geopolymer composition) The geopolymer composition of this embodiment contains at least a geopolymer raw material powder and an activator. Six minutes after the start of mixing the geopolymer raw material powder and the activator, the composition has a complex viscosity greater than 17.9 mPa·s and less than 87.9 mPa·s, measured at an angular frequency of 10 rad / s.

[0021] The geopolymer composition of this embodiment can be used by mixing the geopolymer raw powder and the activator and hardening them. The individual components may be separated during storage, transportation, etc. Furthermore, when the geopolymer composition contains other components described below, only a portion of the components, such as the geopolymer raw powder and aggregate, may be mixed. By storing and transporting the components separately in this manner, only the required amounts of each component can be mixed during construction and used as a hardened product. Furthermore, storing the components without mixing them can suppress deterioration of the properties of each component, thereby maintaining long-term storage stability. The components of the geopolymer composition can be mixed using methods commonly used in the field. The order of mixing can be set as desired.

[0022] The geopolymer composition of this embodiment is coated on, for example, a steel frame as a hardened body. Note that the object to be coated with the geopolymer composition does not have to be limited to a steel frame.

[0023] (Geopolymer raw material powder) Geopolymer raw material powder is an active filler. The active filler is a powder containing glass (amorphous material) that undergoes a geopolymer-forming reaction in an alkaline environment. It is preferable that the active filler has pozzolanic activity.

[0024] A substance with pozzolanic activity is one that has almost no hydraulic properties itself, but reacts with an alkali metal salt, such as calcium hydroxide, in the presence of water at room temperature to produce an insoluble compound that hardens. Examples of substances with pozzolanic activity include clay, sediments, minerals, silica-based particles, and coal ash. Examples include clays such as metakaolin, kaolin, activated clay, and acid clay; sediments such as diatomaceous earth; minerals such as talc; silica-based particles such as silica dust, silica fume, and aerosil; and coal ash such as fly ash, white carbon, and rice husk ash.

[0025] The active filler preferably contains aluminum with an oxygen coordination number of 5. The aluminum with an oxygen coordination number of 5 is preferably contained in an amount of 10 mass % or more, and preferably 20 mass % or more, based on the total amount of aluminum contained in the active filler. Because aluminum with an oxygen coordination number of 5 is highly reactive, it can react sufficiently with the activator at room temperature in the cured product.

[0026] In order to contain such aluminum and silicon, the active filler is preferably metakaolin, for example. The active filler preferably contains metakaolin in an amount of 30% by mass to 100% by mass, more preferably 40% by mass to 80% by mass, and even more preferably 40% by mass to 60% by mass.

[0027] Metakaolin is obtained by calcining kaolin at approximately 500°C to 900°C to remove some of the water of crystallization, and is amorphous and has pozzolanic activity. Metakaolin is preferably in the form of a powder. Here, powder means an aggregate of powder or particles. For example, the number average particle size (D50) of metakaolin powder is preferably 0.1 μm to 20 μm, more preferably 0.5 μm to 15 μm. Powder can be measured using a laser diffraction / scattering particle size distribution analyzer. In order to further activate metakaolin, the specific surface area of ​​the powder is increased to 12 m 2 / g or more is preferred. The specific surface area of ​​the powder means, for example, a value calculated by the BET method. Methods for further activation are not limited, but methods such as pulverization classification, application of mechanical energy, and thermal spraying can be used.

[0028] Any known method can be used for the pulverization and classification. Pulverization can be performed using a jet mill, a roll mill, a ball mill, or the like. Classification can be performed using a sieve, specific gravity, wind force, wet sedimentation, or the like. These methods can be used in combination as desired.

[0029] Methods for applying mechanical energy include those using a ball media mill, a media-agitated mill, a roller mill, etc. The applied mechanical energy is preferably 0.5 kWh / kg or more and 30 kWh / kg or less to minimize the load while maintaining adequate activation. By setting the energy in this range, depending on the metakaolin used as the raw material, sufficient modification of the crystal structure can be achieved, improving the reactivity of the metakaolin powder at room temperature. Furthermore, recrystallization of minerals such as spinel and mullite in the metakaolin powder can be suppressed, maintaining or improving reactivity at room temperature.

[0030] The thermal spraying method is a thermal spraying technique used for ceramic coating. Examples of the thermal spraying technique include plasma spraying, high-energy gas spraying, and arc spraying. Preferably, the material powder is melted at a temperature of 2000°C to 16000°C, sprayed at a speed of 30 m / s to 800 m / s, and sprayed to a surface having a specific surface area of ​​12 m. 2 / g or more 100m 2 It is preferable to make the powder to have a density of 1 / g or less.

[0031] The active filler is usually in the form of a lump or powder, but it may be used as is in the form of a lump or powder. Furthermore, it may be used after changing its state by methods such as pulverization / classification, application of mechanical energy, or thermal spraying for activation. The pulverization / classification method, the application of mechanical energy, and the thermal spraying method can be the same as those described above. In particular, the material powder is melted at a temperature of 2000°C to 16000°C, sprayed at a speed of 30 m / s to 800 m / s, and sprayed to a specific surface area of ​​0.1 m. 2 / g or more 100m 2 It is preferable that the powder has a particle size of 1 / g or less. Fine particles with a large specific surface area have high reactivity and high adsorption capacity, and therefore can exhibit a stabilizing effect on metals. For example, the particle size can be 50 μm or less, preferably 20 μm or less, and more preferably 5 nm or more and 10 μm or less.

[0032] The difference in electrical conductivity of the substance having pozzolanic activity is preferably 0.4 mS / cm or more. From the viewpoint of reactivity with the aqueous silicate solution, the difference in electrical conductivity of the substance having pozzolanic activity is more preferably 0.5 mS / cm or more, 0.6 mS / cm or more, or 0.7 mS / cm or more, and even more preferably 0.8 mS / cm or more, 1.0 mS / cm or more, or 1.2 mS / cm or more.

[0033] Such a difference in electrical conductivity ensures sufficient reactivity with silicate aqueous solutions. The difference in electrical conductivity is an index related to the reactivity of pozzolanic active substances induced by alkaline substances. For substances with pozzolanic activity, the electrical conductivity of 200 ml of saturated aqueous Ca(OH)2 solution was measured at 40 ± 1°C according to "Cement Concrete Research, Vol. 19, pp. 63-68, 1989." Next, 5 g of metakaolin was added, stirred, and the electrical conductivity was measured two minutes later. The difference between the electrical conductivity before and after the addition was calculated and used as the electrical conductivity difference.

[0034] The active filler may contain a substance that has pozzolanic activity and an electrical conductivity difference of less than 0.4 mS / cm.

[0035] The active filler is preferably contained in a proportion of 30 parts by weight to 150 parts by weight per 100 parts by weight of the activator.

[0036] It is also preferable not to use slag as the geopolymer raw material powder, as the melting temperature is lowered by using slag. A small amount of slag may be included as an additional component, as described below, but it may be included in such a small amount that the Ca content of the solid content of the hardened body, excluding aggregate, is 2% by weight or less. In other words, if the hardened body does not contain aggregate, the Ca content of the solid content of the hardened body will be 2% by weight or less.

[0037] (activator) The activator includes, for example, an alkali metal. The activator includes, for example, a salt of an element belonging to Group 1, such as lithium, sodium, potassium, rubidium, cesium, or francium, and among these, an activator including a lithium salt, a sodium salt, or a potassium salt is preferred. The activator is particularly preferably an activator including an alkali metal silicate.

[0038] Examples of alkali metal silicates include one or more selected from the group consisting of sodium silicate, potassium silicate, and lithium silicate. Among these, sodium silicate is preferred from the viewpoints of cost and availability, and water glass is preferred. The alkali metal silicate is preferably used in the form of an aqueous solution due to its ease of handling. Examples of alkali metal silicates that can be used include commercially available sodium silicate, potassium silicate, lithium silicate, or mixtures thereof. Alkali metal silicates can be easily prepared using sodium silicate Nos. 1 to 3, sodium silicate No. 4, and sodium metasilicate Nos. 1 and 2 according to JIS standard (K1408).

[0039] Alkali metal silicates, such as sodium silicate, potassium silicate, and lithium silicate, are generally represented by the molecular formula MO·nSiO, where n is in the range of 0.5 to 4.0, and refer to compositions and mixtures thereof. n is preferably 0.7 to 3.0, and more preferably 1.0 to 2.0. n can be adjusted as desired by mixing the alkali metal silicate with an alkali metal hydroxide, such as sodium hydroxide, potassium hydroxide, or lithium hydroxide. The alkali metal hydroxide can be used in either solid or aqueous form.

[0040] In the geopolymer composition, the content of the activator is usually 10% by mass or more and 70% by mass or less, preferably 15% by mass or more and 65% by mass or less, more preferably 20% by mass or more and 60% by mass or less, and even more preferably 30% by mass or more and 55% by mass or less, based on the total mass of the geopolymer composition. When the content is within the above range, the mechanical strength of the hardened body obtained from the geopolymer composition tends to be improved.

[0041] When mixed with the geopolymer raw powder, an activator, such as an alkali metal silicate, induces a dehydration reaction, forming Si-O bonds, which initiates hardening. Furthermore, as described below, the use of a hardening accelerator can accelerate hardening by replacing the alkali metal in the alkali metal silicate with a divalent or higher metal, forming Si-O-metal-O-Si bonds.

[0042] (Other ingredients) The geopolymer composition may contain aggregates, heat-absorbing materials, or foaming agents as components other than the geopolymer raw material powder and activator.

[0043] The aggregate can be one of wollastonite, perlite, SLW17, or CA6, or a mixture of at least two of these. The amount of aggregate is preferably set to 60 parts by weight or less per 100 parts by weight of geopolymer raw powder. The aggregate is contained in the hardened body in a ratio of 0 to 90% by volume of the total volume.

[0044] The aggregate may include needle-like or fibrous aggregate, and the above-mentioned wallasite can be used as such aggregate.

[0045] The aggregate may include lightweight aggregate, such as the above-mentioned perlite having a particle size of 3 mm or less and a density of 0.3 g / cm. 3 The following can be used:

[0046] The aggregate preferably has a melting point of 1000°C or higher. By using aggregate with a melting point different from that of the mixture of geopolymer raw material powder and activator, it is possible to suppress the shrinkage of the hardened body due to heat.

[0047] The heat absorbing material may be one of aluminum hydroxide, magnesium hydroxide, calcium aluminate, gypsum, or calcium carbonate, or a mixture of at least two of these. The heat absorbing material may be contained in the hardened body in an amount of 0 to 40% by weight based on the total weight.

[0048] The cured product can be made into a foam by chemical foaming or mechanical foaming. Hydrogen peroxide or zinc stearate can be used for chemical foaming. Hydrogen peroxide is used as a foaming agent, and zinc stearate is used as a foam stabilizer. For mechanical foaming, water or an alkaline aqueous solution and a foaming agent can be used. The voids formed by the foaming agent have a diameter of 0.01 mm to 1 mm.

[0049] The expansion ratio is preferably in the range of 1 to 6 times. From the viewpoint of improving fire resistance, the expansion ratio is more preferably in the range of 1.6 to 3 times. The expansion ratio of a test specimen is the reciprocal of the ratio of the specific gravity of the test specimen containing gas to the specific gravity of the test specimen before containing gas using a foaming agent or a foaming agent, assuming that the specific gravity of the test specimen before containing gas using a foaming agent or a foaming agent is 1.

[0050] The specific gravity of the test specimen is calculated from the weight and volume of the test specimen after it has been prepared and dried at 105°C until the mass change rate reaches 0.1%.

[0051] The expansion ratio can be calculated by (specific gravity of the test specimen containing gas) / (specific gravity of the test specimen before containing gas using a foaming agent or a foaming agent) = (expansion ratio).

[0052] The geopolymer composition may further contain additives known in the art as other components. For example, accelerators, fillers, modifiers, retarders, surfactants, etc. These additives may be added to the geopolymer raw powder, activator, aggregate, or a mixture thereof. Known accelerators, fillers, modifiers, retarders, surfactants, etc. may be used.

[0053] Examples of the curing accelerator include components that accelerate the curing of the activator. Curing accelerators are preferably those that are adjusted to a near-neutral pH to accelerate the dehydration reaction. Furthermore, in order to accelerate curing by forming Si-O-metal-O-Si bonds, sodium silicate, potassium silicate, or a mixture thereof that can replace the alkali metal with a divalent or higher metal is preferred. The curing accelerator preferably contains one or more compounds selected from the group consisting of organic acid esters, dialdehydes, inorganic acid esters, organic acid metal salts, inorganic acid metal salts, metal oxides, and metal hydroxides. It is more preferred to use one or more compounds selected from the group consisting of organic acid esters, metal oxides, and metal hydroxides.

[0054] Organic acid esters have the advantage of being able to promote the formation of Si-O bonds by generating acid in an aqueous solution. Examples of organic acid esters include carbonate esters and acetate esters. Of these, triacetin is preferred. Examples of dialdehydes include malondialdehyde. Examples of inorganic acid esters include esters of nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, etc., such as trimethyl phosphate. Examples of organic acid metal salts include alkali metal and alkaline earth metal salts of formic acid, acetic acid, malonic acid, carbonic acid, etc., such as sodium bicarbonate.

[0055] Examples of inorganic acid metal salts include alkali metal and alkaline earth metal salts of nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, etc., such as magnesium sulfate. Metal oxides and metal hydroxides form Si-O-metal-O-Si bonds by dissolving metal ions, which can harden sodium silicate, potassium silicate, or a mixture thereof. Examples of metal oxides and metal hydroxides include magnesium hydroxide, magnesium carbonate, calcium carbonate, calcium hydroxide, etc.

[0056] Examples of fillers include organic fillers (e.g., cellulose) and inorganic fillers (e.g., carbon, mineral fine powder, synthesized inorganic crystal powder, calcium carbonate, etc.) Examples of mineral fine powders include greywacke powder, silica sand powder, zeolite, zirconia, and silica powder.

[0057] Modifiers include substances that modify the surface of the hardened geopolymer composition to densify it and improve its surface strength. Examples of modifiers include various metal salts that can react with aqueous silicate solutions, such as light-burned magnesium oxide and zinc oxide.

[0058] Examples of setting retarders include sucrose, sodium tartrate, citric acid, and metal chelating agents.

[0059] A surfactant is a substance that contributes to the dispersion stabilization of geopolymer compositions. Surfactants may be anionic, cationic, or nonionic. Nonionic surfactants are preferred. Examples of anionic surfactants include sodium lauryl sulfate, sodium lauryl sulfate, and linear alkylbenzene sulfonate. Examples of cationic surfactants include tetramethylammonium chloride, tetramethylammonium hydroxide, and monomethylamine hydrochloride. Examples of nonionic surfactants include sorbitan fatty acid esters, sucrose fatty acid esters, polyoxyethylene alkyl ethers, octaethylene glycol monododecyl ether, polyoxyethylene alkylphenyl ethers, polyoxyethylene polyoxypropylene glycol, and lauric acid diethanolamide.

[0060] These additives can be used in any amount within the range that does not impair the intended function of the cured product.

[0061] (Complex viscosity of geopolymer compositions) The geopolymer composition of this embodiment has a complex viscosity measured at an angular frequency of 10 rad / s of greater than 17.9 mPa·s and less than 87.9 mPa·s 6 minutes after the start of mixing the geopolymer raw material powder and the activator.

[0062] Furthermore, it is preferable that the complex viscosity of the geopolymer composition measured at an angular frequency of 100 rad / s 5 minutes after the start of mixing the geopolymer raw powder and activator is lower than the complex viscosity measured at an angular frequency of 10 rad / s 6 minutes after the start of mixing, and that the complex viscosity measured at an angular frequency of 1 rad / s 7 minutes after the start of mixing is higher than the complex viscosity measured at an angular frequency of 10 rad / s 6 minutes after the start of mixing.

[0063] If the geopolymer composition contains other components as described above, the other components may be mixed at the same time as the geopolymer raw powder and the activator are mixed, or may be mixed in advance with either the geopolymer raw powder or the activator before mixing.

[0064] (Construction method) Figure 1 shows a steel frame whose surface has been coated with a geopolymer composition. The steel frame 100 shown in Figure 1 is not particularly limited, but may be made of, for example, SS material, SM material, or SN material. The steel frame 100 is an H-shaped steel, but the shape is not particularly limited.

[0065] The geopolymer raw material powder, activator, and other components are mixed, and the mixed composition is applied to the surface 100s of the steel frame 100. Methods for application include brushing, rollers, spray guns, plastering, and the like.

[0066] After application, the geopolymer composition is allowed to set.

[0067] As a result, as shown in Figure 1, the surface 100s of the steel frame 100 can be coated with the hardened geopolymer composition 1. In Figure 1, the entire surface 100s of the steel frame 100 is coated with the geopolymer composition 1, but only a portion of it may be coated, and only the necessary areas may be coated as appropriate.

[0068] (Example) The present embodiment will be described in detail below using examples. In this example, the complex viscosity of each of several types of geopolymer compositions was measured, and adhesion to steel frames was evaluated.

[0069] (Method for measuring complex viscosity) All ingredients comprising the geopolymer composition, including at least the geopolymer raw powder and activator, were mixed. Five minutes after the start of mixing, the composition was measured using an Anton Paar Japan MCR102 (disk rheometer) under the following conditions: vibration measurement with a measurement clearance of 2 mm, a temperature of 23°C, automatic measurement at four measurement points, and logarithmic measurement at angular frequencies from 100 rad / s to 0.1 rad / s. The complex viscosity at an angular frequency of 10 rad / s was obtained. Measurements were made in the following order: 100 rad / s, 10 rad / s, 1 rad / s, and 0.1 rad / s. The complex viscosity at 100 rad / s was measured five minutes after the start of mixing, so the complex viscosity at 10 rad / s was measured six minutes after the start of mixing. Furthermore, the complex viscosity at an angular frequency of 1 rad / s is measured 7 minutes after the start of mixing, and the complex viscosity at an angular frequency of 0.1 rad / s is measured 9 minutes after the start of mixing.

[0070] (Adhesion evaluation) The following evaluation criteria were used to evaluate the adhesion of the geopolymer composition to the steel frame: All materials making up the geopolymer composition, whose complex viscosity was obtained at an angular frequency of 10 rad / s, were mixed, and the composition was applied 6 minutes after mixing began to the surface 100a of the SS400 steel frame 100, which was parallel to the direction of gravity, as shown in Figure 2. Geopolymer compositions that did not move in the direction of gravity, even when the applied thickness d in the direction perpendicular to gravity was 45 mm or more, were judged as good (◯), while those that moved in the direction perpendicular to gravity at a thickness of less than 45 mm were judged as poor (×). Since a thickness of approximately 45 mm is required to actually impart fire resistance, 45 mm was set as the threshold for determining whether the composition was good or poor.

[0071] The complex viscosity measurements and adhesion evaluations were carried out for the geopolymer products of the following Examples 1 to 3 and Comparative Examples 1 to 10. The results are shown in Table 1 below.

[0072] Example 1 The geopolymer composition of Example 1 used metakaolin as the geopolymer raw powder and water glass as the activator. Furthermore, wollastonite was added as an aggregate to the geopolymer composition of Example 1. The geopolymer composition of Example 1 contained 120 parts by weight of metakaolin and 50 parts by weight of wollastonite per 100 parts by weight of water glass. Complex viscosity measurements and adhesion evaluations were performed on geopolymer compositions with this composition. The geopolymer composition of Example 1 had a complex viscosity of 27.3 mPa·s at an angular frequency of 10 rad / s, and did not move in the direction of gravity even when the composition reached a thickness of 45 mm or more.

[0073] Example 2 The geopolymer composition of Example 2 used metakaolin as the geopolymer raw material powder and water glass as the activator. The geopolymer composition of Example 2 contained 130 parts by weight of metakaolin per 100 parts by weight of water glass. Unlike Example 1, no aggregate was added to the geopolymer composition of Example 2. Complex viscosity measurements and adhesion evaluations were performed on geopolymer compositions with this composition. The geopolymer composition of Example 2 had a complex viscosity of 29.0 mPa·s at an angular frequency of 10 rad / s, and did not move in the direction of gravity even when it reached a thickness of 45 mm or more.

[0074] Example 3 The geopolymer composition of Example 3 used metakaolin as the geopolymer raw material powder and water glass as the activator. The geopolymer composition of Example 3 contained 140 parts by weight of metakaolin per 100 parts by weight of water glass. Unlike Example 1, no aggregate was added to the geopolymer composition of Example 3. Complex viscosity measurements and adhesion evaluations were performed on geopolymer compositions with this composition. The geopolymer composition of Example 3 had a complex viscosity of 50.4 mPa·s at an angular frequency of 10 rad / s, and did not move in the direction of gravity even when it reached a thickness of 45 mm or more.

[0075] (Comparative Example 1) The geopolymer composition of Comparative Example 1 used metakaolin as the geopolymer raw material powder and water glass as the activator. The geopolymer composition of Comparative Example 1 contained 70 parts by weight of metakaolin per 100 parts by weight of water glass. Unlike Example 1, no aggregate was added to the geopolymer composition of Comparative Example 1. Complex viscosity measurements and adhesion evaluations were performed on geopolymer compositions with this composition. The geopolymer composition of Comparative Example 1 had a complex viscosity of 0.5 mPa·s at an angular frequency of 10 rad / s, and moved in the direction of gravity at a thickness of less than 45 mm.

[0076] (Comparative Example 2) The geopolymer composition of Comparative Example 2 used metakaolin as the geopolymer raw powder and water glass as the activator. Wollastonite was also added as an aggregate to the geopolymer composition of Comparative Example 2. The geopolymer composition of Comparative Example 2 contained 80 parts by weight of metakaolin and 70 parts by weight of wollastonite per 100 parts by weight of water glass. Complex viscosity measurements and adhesion evaluations were performed on geopolymer compositions with this composition. The geopolymer composition of Comparative Example 2 had a complex viscosity of 5.4 mPa·s at an angular frequency of 10 rad / s and moved in the direction of gravity at a thickness of less than 45 mm.

[0077] (Comparative Example 3) The geopolymer composition of Comparative Example 3 used metakaolin as the geopolymer raw material powder and water glass as the activator. The geopolymer composition of Comparative Example 3 contained 105 parts by weight of metakaolin per 100 parts by weight of water glass. Unlike Example 1, no aggregate was added to the geopolymer composition of Comparative Example 3. Complex viscosity measurements and adhesion evaluations were performed on geopolymer compositions with this composition. The geopolymer composition of Comparative Example 3 had a complex viscosity of 5.0 mPa·s at an angular frequency of 10 rad / s, and moved in the direction of gravity at a thickness of less than 45 mm.

[0078] Comparative Example 4 The geopolymer composition of Comparative Example 4 used metakaolin as the geopolymer raw material powder and water glass as the activator. Wollastonite was also added as an aggregate to the geopolymer composition of Comparative Example 4. The geopolymer composition of Comparative Example 4 contained 110 parts by weight of metakaolin and 50 parts by weight of wollastonite per 100 parts by weight of water glass. Complex viscosity measurements and adhesion evaluations were performed on geopolymer compositions with this composition. The geopolymer composition of Comparative Example 4 had a complex viscosity of 13.0 mPa·s at an angular frequency of 10 rad / s and moved in the direction of gravity at a thickness of less than 45 mm.

[0079] (Comparative Example 5) The geopolymer composition of Comparative Example 5 used metakaolin as the geopolymer raw powder and water glass as the activator. Wollastonite was also added as an aggregate to the geopolymer composition of Comparative Example 5. The geopolymer composition of Comparative Example 5 contained 110 parts by weight of metakaolin and 60 parts by weight of wollastonite per 100 parts by weight of water glass. Complex viscosity measurements and adhesion evaluations were performed on geopolymer compositions with this composition. The geopolymer composition of Comparative Example 5 had a complex viscosity of 15.1 mPa·s at an angular frequency of 10 rad / s and moved in the direction of gravity at a thickness of less than 45 mm.

[0080] (Comparative Example 6) The geopolymer composition of Comparative Example 6 used metakaolin as the geopolymer raw material powder and water glass as the activator. The geopolymer composition of Comparative Example 6 contained 120 parts by weight of metakaolin per 100 parts by weight of water glass. Unlike Example 1, no aggregate was added to the geopolymer composition of Comparative Example 6. Complex viscosity measurements and adhesion evaluations were performed on geopolymer compositions with this composition. The geopolymer composition of Comparative Example 6 had a complex viscosity of 12.7 mPa·s at an angular frequency of 10 rad / s, and moved in the direction of gravity at a thickness of less than 45 mm.

[0081] (Comparative Example 7) The geopolymer composition of Comparative Example 7 used metakaolin as the geopolymer raw powder and water glass as the activator. Wollastonite was also added as an aggregate to the geopolymer composition of Comparative Example 7. The geopolymer composition of Comparative Example 7 contained 120 parts by weight of metakaolin and 40 parts by weight of wollastonite per 100 parts by weight of water glass. Complex viscosity measurements and adhesion evaluations were performed on geopolymer compositions with this composition. The geopolymer composition of Comparative Example 7 had a complex viscosity of 17.9 mPa·s at an angular frequency of 10 rad / s and moved in the direction of gravity at a thickness of less than 45 mm.

[0082] (Comparative Example 8) The geopolymer composition of Comparative Example 8 used metakaolin as the geopolymer raw material powder and water glass as the activator. Wollastonite was also added as an aggregate to the geopolymer composition of Comparative Example 8. The geopolymer composition of Comparative Example 8 contained 50 parts by weight of metakaolin and 50 parts by weight of wollastonite per 100 parts by weight of water glass. Complex viscosity measurements and adhesion evaluations were performed on geopolymer compositions with this composition. The geopolymer composition of Comparative Example 9 had a complex viscosity of 0.7 mPa·s at an angular frequency of 10 rad / s and moved in the direction of gravity at a thickness of less than 45 mm.

[0083] Comparative Example 9 The geopolymer composition of Comparative Example 9 used metakaolin as the geopolymer raw powder and water glass as the activator. Wollastonite was also added as an aggregate to the geopolymer composition of Comparative Example 9. The geopolymer composition of Comparative Example 9 contained 130 parts by weight of metakaolin and 30 parts by weight of wollastonite per 100 parts by weight of water glass. Complex viscosity measurements and adhesion evaluations were performed on geopolymer compositions with this composition. The geopolymer composition of Comparative Example 9 had a complex viscosity of 87.9 mPa·s at an angular frequency of 10 rad / s and moved in the direction of gravity at a thickness of less than 45 mm. (Table 1) TIFF2025135855000002.tif32159 From the above, the geopolymer composition of this embodiment can thickly coat steel frames when the complex viscosity measured at an angular frequency of 10 rad / s is greater than 17.9 mPa·s and less than 87.9 mPa·s in the composition 6 minutes after the start of mixing all the materials constituting the geopolymer composition. It is more preferable that the complex viscosity measured at an angular frequency of 10 rad / s is 27.3 mPa·s or more and 50.4 mPa·s or less. Furthermore, in Examples 1 to 3, the complex viscosity measured at an angular frequency of 100 rad / s 5 minutes after the start of mixing was lower than the complex viscosity measured at an angular frequency of 10 rad / s 6 minutes later, and the complex viscosity measured at an angular frequency of 1 rad / s 7 minutes later was higher than the complex viscosity measured at an angular frequency of 10 rad / s 6 minutes later. [Explanation of symbols]

[0084] 1: Geopolymer composition 100: Steel frame 100s: surface 100a: Face

Claims

1. Geopolymer raw material powder; an activator; The complex viscosity measured at an angular frequency of 10 rad / s 6 minutes after the start of mixing the geopolymer raw material powder and the activator is greater than 17.9 mPa s and less than 87.9 mPa s; Geopolymer composition.

2. The geopolymer composition comprises: the complex viscosity measured at an angular frequency of 100 rad / s 5 minutes after the start of mixing is lower than the complex viscosity measured at an angular frequency of 10 rad / s 6 minutes after mixing, and the complex viscosity measured at an angular frequency of 1 rad / s 7 minutes after mixing is higher than the complex viscosity measured at an angular frequency of 10 rad / s 6 minutes after mixing; 10. The geopolymer composition of claim 1.

3. The geopolymer composition comprises: When the geopolymer raw material powder contains aggregate, the aggregate is 60 parts by weight or less when the geopolymer raw material powder is 100 parts by weight.

3. The geopolymer composition of claim 1 or 2.

4. The geopolymer raw material powder is It is metakaolin, 3. The geopolymer composition of claim 1 or 2.

5. The geopolymer composition comprises: Used to cover steel frames, 10. The geopolymer composition of claim 1.

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