Geopolymer composition

Abstract

To provide a geopolymer composition used in a method for repairing cracks in a concrete structure using an injector, which can be injected in a sufficient amount to reach the finer cracks than conventional geopolymer compositions. [Solution] The geopolymer composition, which is one embodiment of the present invention, is a geopolymer composition obtained by mixing an alkaline solution with an active filler containing fly ash or blast furnace slag powder, and the active filler has an average particle diameter of 8.20 μm or less, and the liquid-solid ratio of the alkaline solution to the active filler is 0.7 to 0.9.

Description

Technical Field

[0001] The present invention relates to a geopolymer composition for repairing cracks in concrete structures.

Background Art

[0002] Conventionally, when repairing a concrete structure cracked due to aging deterioration, there is a repair method of directly injecting a geopolymer composition into the cracked portion with an injector. And as the geopolymer composition used in this repair method, there was one obtained by mixing an active filler containing perlite powder and blast furnace slag powder in an alkaline solution (for example, refer to Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in such a conventional geopolymer composition, since the particle diameters of the constituent components, particularly the average particle diameter of the active filler, are large, in the repair method using an injector as described above, a sufficient amount of the geopolymer composition cannot be injected up to the details of the crack, and there is a risk that sufficient repair cannot be performed. Further, in the conventional geopolymer composition, the appropriate relative particle amount of the active filler that can inject a sufficient amount into the details of the crack was unknown. That is, in the geopolymer composition used in the repair method of cracks in concrete structures using an injector, there has been a demand for a composition that can inject a sufficient amount up to the details of the crack as compared with conventional products.

[0005] This invention has been made in view of these problems, and one of its objectives is to provide a geopolymer composition for use in a method of repairing cracks in concrete structures using an injector, which can inject a sufficient amount into even the finest details of the cracks compared to conventional methods. [Means for solving the problem]

[0006] The present invention has been made to solve at least some of the above-mentioned problems and can be realized in the following examples of applications. The reference numerals and supplementary explanations in parentheses in this section are provided to aid in understanding the present invention and indicate its correspondence with the embodiments described later; they do not limit the present invention in any way.

[0007] An example of applying the present invention is a geopolymer composition obtained by mixing an active filler containing fly ash or blast furnace slag powder with an alkaline solution. For crack repair in concrete structures A geopolymer composition wherein the active filler is The average particle diameter is 8.20 μm or less, The sample contains particles with a diameter greater than 25.00 μm, and the relative particle amount of particles with a diameter of 10.00 μm or less is 55% or more of all particles, the relative particle amount of particles with a diameter of 5.00 μm or less is 39% or more, and the relative particle amount of particles with a diameter of 1.00 μm or less is 9% or more. Furthermore, the liquid-to-solid ratio of the alkaline solution to the active filler is 0.7 to 0.9. The gist of this is to say that.

[0008] Furthermore, in the geopolymer composition of the above-described application example, the active filler has a particle size that is appropriate for all particles. Larger than 10.00 μm and 50.00 The relative particle quantity of particles smaller than μm 11~45% The main point could be summarized as follows: [Brief explanation of the drawing]

[0009] [Figure 1-1] This figure illustrates the particle size distribution of the first active filler. [Figure 1-2] This diagram illustrates the particle size distribution of the second active filler. [Figure 1-3]This diagram illustrates the particle size distribution of the third active filler. [Figure 1-4] This figure illustrates the particle size distribution of the fourth active filler. [Figure 1-5] This diagram illustrates the particle size distribution of the fifth active filler. [Figure 1-6] This diagram illustrates the particle size distribution of the sixth active filler. [Figure 1-7] This figure illustrates the particle size distribution of the seventh active filler. [Figure 1-8] This figure illustrates the particle size distribution of the eighth active filler. [Figure 1-9] This figure illustrates the particle size distribution of the ninth active filler. [Figure 1-10] This figure illustrates the particle size distribution of the 10th active filler. [Figure 2] (A) is a diagram illustrating the relationship between grinding time, average particle size, relative particle amount of particles with a particle size of 10.00 μm or less, relative particle amount of particles with a particle size of 5.00 μm or less, and relative particle amount of particles with a particle size of 1.00 μm or less for each of the first to tenth active fillers. (B) is a diagram illustrating the relationship between the particle distribution of each particle size and the relative particle amount for each of the first to tenth active fillers. [Figure 3] (A) is a schematic diagram illustrating the outline of the jig used for the injection experiment, and (B) is a diagram showing the results of the injection experiment with 30 types of injection materials, each of which had three different liquid-to-solid ratios of 0.7, 0.8, and 0.9 for the first to tenth injection materials. [Modes for carrying out the invention]

[0010] The embodiments to which the present invention is applied will be described below with reference to the drawings. However, the embodiments of the present invention are not limited to those described below, and various forms can be taken as long as they fall within the technical scope of the present invention.

[0011] <Description of Geopolymer Composition> One of the embodiments to which the present invention is applied, the geopolimer composition, is obtained by mixing an active filler containing fly ash or blast furnace slag powder into an alkaline solution. Further, the liquid-solid ratio (W / P: alkaline solution / active filler) in the geopolimer composition is preferably 0.7 to 0.9. Setting the liquid-solid ratio to such a value is because when the liquid-solid ratio is less than 0.7, not only is it difficult to knead, but also the initial viscosity is high, making it difficult to inject with an injector. When the liquid-solid ratio is greater than 0.9, there is a problem that bleeding is likely to occur.

[0012] As the alkaline solution in the geopolimer composition of the present embodiment, it is a mixture of an aqueous potassium silicate solution and an aqueous sodium hydroxide solution as described below at a weight ratio of 9:1. · Aqueous potassium silicate solution (SiO₂: 21.0%, K₂O: 9.3%, specific gravity: 1.269) · Aqueous sodium hydroxide solution (molar concentration: 10.0 mol / L, specific gravity: 1.33)

[0013] As the active filler in the geopolimer composition of the present embodiment, it is a mixture obtained by mixing fly ash, blast furnace slag powder, and metakaolin as described below at a weight ratio of 8:1:1, and is finely pulverized so that the average particle diameter is 8.20 μm or less. Note that as a method for finely pulverizing the mixture, 50 kg of the mixture is put into a dry ball mill (manufactured by Ishizaki Iron Works Co., Ltd.: 500 L, 60 Hz, 38 rpm) and operated for a predetermined time so that the average particle diameter is 8.20 μm or less. Details will be described later. Further, the method for finely pulverizing the mixture is not limited to the method using the above-described dry ball mill, and may be a method using various dry pulverizers (jet mill, cyclone mill, roller mill, planetary mill, etc.). · Fly ash JIS Class 1 (FA) (density: 2.36 g / cm 3 , specific surface area: 5327 cm 2 / g) · Blast furnace slag powder JIS Class 8000 (BFS8) (density: 2.90 g / cm3 Specific surface area: 8500 cm 2 / g) · Metakaolin (average particle diameter: 3.00 μm)

[0014] <Explanation of particle size distribution in various active fillers> Referring to FIGS. 1-1 to 1-10 and FIG. 2, the particle size distributions of the first to tenth active fillers, which are ten types of active fillers, will be described. The first to tenth active fillers are mixtures of materials as described above, and in each active filler, the operating time of the dry ball mill for pulverization (hereinafter referred to as the pulverization time) is varied. Also, the measurement of the particle size distribution was carried out on a predetermined amount of sample of each active filler using a laser diffraction particle size distribution measuring device (manufactured by Shimadzu Corporation: SALD-300V). FIG. 1-1 is a diagram for explaining the particle size distribution of the first active filler, FIG. 1-2 is a diagram for explaining the particle size distribution of the second active filler, FIG. 1-3 is a diagram for explaining the particle size distribution of the third active filler, FIG. 1-4 is a diagram for explaining the particle size distribution of the fourth active filler, and FIG. 1-5 is a diagram for explaining the particle size distribution of the fifth active filler. Also, FIG. 1-6 is a diagram for explaining the particle size distribution of the sixth active filler, FIG. 1-7 is a diagram for explaining the particle size distribution of the seventh active filler, FIG. 1-8 is a diagram for explaining the particle size distribution of the eighth active filler, FIG. 1-9 is a diagram for explaining the particle size distribution of the ninth active filler, and FIG. 1-10 is a diagram for explaining the particle size distribution of the tenth active filler. FIG. 2(A) is a diagram for explaining the relationship between the pulverization time, average particle diameter, relative particle amount of particles with a particle diameter of 10.00 μm or less, relative particle amount of particles with a particle diameter of 5.00 μm or less, and relative particle amount of particles with a particle diameter of 1.00 μm or less in each of the first to tenth active fillers, and FIG. 2(B) is a diagram for explaining the relationship between the distribution of particles with each particle diameter and the relative particle amount in each of the first to tenth active fillers.

[0015] As shown in Figure 1-1, the first active filler, when ground for 0.25 hours (15 minutes), has a particle size distribution such that 33.439% of all particles have a particle size of 10.00 μm or less, 19.906% have a particle size of 5.00 μm or less, and 2.504% have a particle size of 1.00 μm or less. The average particle size of the first active filler is 15.271 μm.

[0016] As shown in Figure 1-2, the second active filler, when ground for 0.5 hours (30 minutes), has a particle size distribution such that 36.848% of the particles have a diameter of 10.00 μm or less, 23.047% have a diameter of 5.00 μm or less, and 3.403% have a diameter of 1.00 μm or less. The average particle size of the second active filler is 14.032 μm.

[0017] As shown in Figure 1-3, the third active filler, when ground for 1 hour (60 minutes), has a particle size distribution such that 38.853% of the particles have a diameter of 10.00 μm or less, 24.954% have a diameter of 5.00 μm or less, and 4.564% have a diameter of 1.00 μm or less. The average particle size of the third active filler is 13.444 μm.

[0018] As shown in Figure 1-4, the fourth active filler, when ground for 2 hours (120 minutes), has a particle size distribution such that 44.463% of all particles have a particle size of 10.00 μm or less, 29.607% have a particle size of 5.00 μm or less, and 5.934% have a particle size of 1.00 μm or less. The average particle size of the fourth active filler is 11.671 μm.

[0019] As shown in Figure 1-5, the fifth active filler, when ground for 3 hours (180 minutes), has a particle size distribution such that 55.392% of all particles have a particle size of 10.00 μm or less, 39.560% have a particle size of 5.00 μm or less, and 9.589% have a particle size of 1.00 μm or less. The average particle size of the fifth active filler is 8.156 μm.

[0020] As shown in Figure 1-6, the sixth active filler, when ground for 4 hours (240 minutes), has a particle size distribution such that 62.385% of the particles have a diameter of 10.00 μm or less, 46.345% have a diameter of 5.00 μm or less, and 14.029% have a diameter of 1.00 μm or less. The average particle size of the sixth active filler is 5.821 μm.

[0021] As shown in Figure 1-7, the seventh active filler, when ground for 6 hours (360 minutes), has a particle size distribution such that 68.499% of all particles have a particle size of 10.00 μm or less, 52.440% have a particle size of 5.00 μm or less, and 16.315% have a particle size of 1.00 μm or less. The average particle size of the seventh active filler is 4.560 μm.

[0022] As shown in Figure 1-8, the eighth active filler, when ground for 8 hours (480 minutes), has a particle size distribution such that 78.175% of the particles have a diameter of 10.00 μm or less, 60.486% have a diameter of 5.00 μm or less, and 19.860% have a diameter of 1.00 μm or less. The average particle size of the eighth active filler is 3.449 μm.

[0023] As shown in Figure 1-9, the ninth active filler, when ground for 10 hours (600 minutes), has a particle size distribution such that 84.075% of the particles have a diameter of 10.00 μm or less, 66.052% have a diameter of 5.00 μm or less, and 22.132% have a diameter of 1.00 μm or less. The average particle size of the ninth active filler is 2.969 μm.

[0024] As shown in Figure 1-10, the tenth active filler, when ground for 12 hours (720 minutes), has a particle size distribution such that 88.064% of the particles have a diameter of 10.00 μm or less, 69.239% have a diameter of 5.00 μm or less, and 23.108% have a diameter of 1.00 μm or less. The average particle size of the tenth active filler is 2.639 μm.

[0025] As shown in Figures 2(A) and (B), the six types of active fillers, from the 5th to the 10th active filler, have a longer grinding time than the four types of active fillers, from the 1st to the 4th active filler. As a result, the relative particle amount of particles with a relatively small particle size of 10.00 μm or less is larger for the six types of active fillers, from the 1st to the 4th active filler. Specifically, for the six types of active fillers, from the 5th to the 10th active filler, the relative particle amount of particles with a particle size of 10.00 μm or less is 55% to 89%, the relative particle amount of particles with a particle size of 5.00 μm or less is 39% to 70%, and the relative particle amount of particles with a particle size of 1.00 μm or less is 9% to 24%. Furthermore, the six active fillers, from the 5th to the 10th active filler, have relatively smaller particle sizes than the four active fillers, from the 1st to the 4th active filler, resulting in an average particle size of 2.60 μm or more and 8.20 μm or less.

[0026] <Explanation of injection experiment with injection material (geopolymer composition)> Referring to Figure 3, the results of injection experiments conducted on 10 types of geopolymer compositions, known as injection materials 1 through 10, will be explained. Figure 3(A) is a schematic diagram illustrating the outline of the jig used for the injection experiment, and Figure 3(B) shows the results of injection experiments conducted on 30 types of injection materials, each with three different liquid-to-solid ratios of 0.7, 0.8, and 0.9 for each of the injection materials 1 through 10.

[0027] Here, we will specifically describe the injection experiments for the geopolymer compositions, namely the first to tenth injection materials. First, the first to tenth injection materials used in these injection experiments are prepared by mixing each of the first to tenth active fillers with the aforementioned alkaline solution. The first injection material is mixed with the first active filler, the second injection material is mixed with the second active filler, the third injection material is mixed with the third active filler, the fourth injection material is mixed with the fourth active filler, the fifth injection material is mixed with the fifth active filler, the sixth injection material is mixed with the sixth active filler, the seventh injection material is mixed with the seventh active filler, the eighth injection material is mixed with the eighth active filler, the ninth injection material is mixed with the ninth active filler, and the tenth injection material is mixed with the tenth active filler. Furthermore, in this injection experiment, a total of 30 types of injection materials were used, with each of the 1st to 10th injection materials having a liquid-to-solid ratio (W / P) of 0.7, 0.8, and 0.9. The experiment involved measuring the reach distance l (mm) of the injection material injected into a gap in an injection experiment jig 10, which had a gap simulating a 0.1 mm wide crack in a concrete structure. This experiment was performed three times for each of the 30 types of injection materials. Based on the average of the reach distances measured in the three injection experiments for each injection material, the "injection reach (average reach distance l (mm) for each injection material / maximum distance L (mm) in the gap × 100) (%)" (see Figure 3(A)) was calculated for each of the 30 types of injection materials, and a score of 80% or higher was considered a pass (〇: 80% or more and less than 90%, ◎: 90% or more).

[0028] As shown in Figure 3(A), the jig 10 used for the injection experiment consists of two acrylic plates 12a and 12b, each measuring 300 mm in length, 300 mm in width, and 15 mm in thickness, and a spacer portion 13 made of a 0.1 mm thick sheet of Teflon®. The jig 10 is constructed by overlapping the two acrylic plates 12a and 12b with a predetermined spacer portion 13 in between, and is fixed by multiple clamps (not shown) so that no gap is formed between the acrylic plates 12a and 12b and the spacer portion 13, while a 0.1 mm gap is formed between the two acrylic plates 12a and 12b. An injection port 15 is formed in this 0.1 mm gap for injecting the material using a spring-type automatic injector (not shown) for low-pressure injection. In this jig 10, the maximum distance L (mm) of the 0.1 mm gap is 300 (mm). Furthermore, while typical injection experiments are performed on a 0.2 mm gap as a simulated crack, the injection experiment in this embodiment was conducted on a 0.1 mm gap as a simulated crack, which is a more stringent condition.

[0029] As shown in Figure 3(B), for the first grout, the one with a liquid-to-solid ratio (W / P) of 0.7 is unacceptable (×) because the injection reach is 7%, the one with a liquid-to-solid ratio (W / P) of 0.8 is unacceptable (×) because the injection reach is 17%, and the one with a liquid-to-solid ratio (W / P) of 0.9 is unacceptable (×) because the injection reach is 10%. For the second grout, the one with a liquid-to-solid ratio (W / P) of 0.7 is unacceptable (×) because the injection reach is 23%, the one with a liquid-to-solid ratio (W / P) of 0.8 is unacceptable (×) because the injection reach is 43%, and the one with a liquid-to-solid ratio (W / P) of 0.9 is unacceptable (×) because the injection reach is 47%. For the third grouting material, the one with a liquid-to-solid ratio (W / P) of 0.7 is unacceptable (×) because the injection reach is 27%, the one with a liquid-to-solid ratio (W / P) of 0.8 is unacceptable (×) because the injection reach is 50%, and the one with a liquid-to-solid ratio (W / P) of 0.9 is unacceptable (×) because the injection reach is 47%. For the fourth grouting material, the one with a liquid-to-solid ratio (W / P) of 0.7 is unacceptable (×) because the injection reach is 42%, the one with a liquid-to-solid ratio (W / P) of 0.8 is unacceptable (×) because the injection reach is 67%, and the one with a liquid-to-solid ratio (W / P) of 0.9 is unacceptable (×) because the injection reach is 50%.

[0030] As shown in Figure 3(B), for the fifth grout, the one with a liquid-to-solid ratio (W / P) of 0.7 is accepted because the injection attainment is 83% (○), the one with a liquid-to-solid ratio (W / P) of 0.8 is accepted because the injection attainment is 93% (◎), and the one with a liquid-to-solid ratio (W / P) of 0.9 is accepted because the injection attainment is 90% (◎). For the sixth grout, the one with a liquid-to-solid ratio (W / P) of 0.7 is accepted because the injection attainment is 93% (◎), the one with a liquid-to-solid ratio (W / P) of 0.8 is accepted because the injection attainment is 100% (◎), and the one with a liquid-to-solid ratio (W / P) of 0.9 is accepted because the injection attainment is 100% (◎). For the seventh grouting material, a liquid-to-solid ratio (W / P) of 0.7 is considered acceptable (◎) because it achieves 100% injection attainment, a liquid-to-solid ratio (W / P) of 0.8 is considered acceptable (◎) because it achieves 100% injection attainment, and a liquid-to-solid ratio (W / P) of 0.9 is considered acceptable (◎) because it achieves 100% injection attainment.

[0031] As shown in Figure 3(B), for the eighth grout, the one with a liquid-to-solid ratio (W / P) of 0.7 is a pass (◎) because it achieved 100% of the injection, the one with a liquid-to-solid ratio (W / P) of 0.8 is a pass (◎) because it achieved 100% of the injection, and the one with a liquid-to-solid ratio (W / P) of 0.9 is a pass (◎) because it achieved 100% of the injection. For the ninth grout, the one with a liquid-to-solid ratio (W / P) of 0.7 is a pass (◎) because it achieved 100% of the injection, the one with a liquid-to-solid ratio (W / P) of 0.8 is a pass (◎) because it achieved 100% of the injection, and the one with a liquid-to-solid ratio (W / P) of 0.9 is a pass (◎) because it achieved 100% of the injection. For the 10th grout, those with a liquid-to-solid ratio (W / P) of 0.7 are considered acceptable (◎) because they achieve 100% injection attainment, those with a liquid-to-solid ratio (W / P) of 0.8 are considered acceptable (◎) because they achieve 100% injection attainment, and those with a liquid-to-solid ratio (W / P) of 0.9 are considered acceptable (◎) because they achieve 100% injection attainment.

[0032] As described above, the fifth to tenth injection materials, which are geopolymer compositions made by mixing each of the fifth to tenth active fillers, each with an average particle diameter of 2.60 μm or more and an average particle diameter of 8.20 μm or less, passed the injection experiment. On the other hand, the first to fourth injection materials, which are geopolymer compositions made by mixing each of the first to fourth active fillers, each with an average particle diameter greater than 8.20 μm, failed the injection experiment. Furthermore, the fifth to tenth injection materials, which are geopolymer compositions made by mixing each of the fifth to tenth active fillers, each with a relative particle amount of 55% or more of particles with a particle diameter of 10.00 μm or less, a relative particle amount of 39% or more of particles with a particle diameter of 5.00 μm or less, and a relative particle amount of 9% or more of particles with a particle diameter of 1.00 μm or less, passed the injection experiment. On the other hand, the first to fourth injection materials, which are geopolymer compositions obtained by mixing first to fourth active fillers, each having a relative particle amount of less than 45% of particles with a particle diameter of 10.00 μm or less, less than 30% of particles with a particle diameter of 5.00 μm or less, and less than 6% of particles with a particle diameter of 1.00 μm or less, failed the injection experiment. The six injection materials, fifth to tenth injection materials, correspond to the geopolymer compositions of this embodiment described above.

[0033] <Characteristics of the geopolymer composition of this embodiment> The fifth to tenth injection materials, which are geopolymer compositions of the above-described embodiments, are geopolymer compositions obtained by mixing an active filler containing fly ash or blast furnace slag powder with an alkaline solution, characterized in that the fifth to tenth active fillers, which are active fillers, have an average particle size of 8.20 μm or less.

[0034] With such a geopolymer composition, the average particle size of the fifth to tenth active fillers, which are mixed active fillers in the above-described embodiment, is 8.20 μm or less, which is sufficiently small. Therefore, a sufficient amount can be injected into gaps simulating cracks with a width of 0.1 mm in concrete structures, and the injection experiment will pass. Accordingly, with such a geopolymer composition, in a method of repairing cracks in concrete structures using an injector, a sufficient amount can be injected into even the finer details of the cracks than in conventional methods.

[0035] Furthermore, in the fifth to tenth injection materials, which are geopolymer compositions of the above-described embodiments, the fifth to tenth active fillers, which are active fillers, are characterized in that the relative particle amount of particles with a particle diameter of 10.00 μm or less is 55% or more of all particles. With such a geopolymer composition, in the fifth to tenth injection materials of the above-described embodiments, the relative particle amount of very small particles with a particle diameter of 10.00 μm or less of the mixed active fillers, the fifth to tenth active fillers, is sufficiently large at 55% or more, so that a sufficient amount can be injected into gaps simulating cracks with a width of 0.1 mm in concrete structures, and the injection experiment can be passed.Therefore, with such a geopolymer composition, in a method of repairing cracks in concrete structures using an injector, a sufficient amount can be injected into even the finer details of the cracks than in conventional methods. Furthermore, based on this injection experiment, it was found that in active fillers of geopolymer compositions that can be injected in sufficient quantities into the fine details of cracks using general repair methods, the relative particle amount of particles with a particle size of 10.00 μm or less is 55% or more.

[0036] Furthermore, in the fifth to tenth injection materials, which are geopolymer compositions of the above-described embodiments, the fifth to tenth active fillers, which are active fillers, are characterized in that the relative particle amount of particles with a particle diameter of 5.00 μm or less is 39% or more of all particles. With such a geopolymer composition, in the fifth to tenth injection materials of the above-described embodiments, the relative particle amount of very small particles with a particle diameter of 5.00 μm or less of the mixed active fillers, the fifth to tenth active fillers, is sufficiently large at 39% or more, so that a sufficient amount can be injected into gaps simulating cracks with a width of 0.1 mm in concrete structures, and the injection experiment can be passed.Therefore, with such a geopolymer composition, in a method of repairing cracks in concrete structures using an injector, a sufficient amount can be injected into even the finer details of the cracks than in conventional methods. Furthermore, based on this injection experiment, it was found that in active fillers of geopolymer compositions that can be injected in sufficient quantities into the fine details of cracks using general repair methods, the relative amount of particles with a particle size of 5.00 μm or less is 39% or more.

[0037] Furthermore, in the fifth to tenth injection materials, which are geopolymer compositions of the above-described embodiments, the fifth to tenth active fillers, which are active fillers, are characterized in that the relative particle amount of particles with a particle diameter of 1.00 μm or less is 9% or more of all particles. With such a geopolymer composition, in the fifth to tenth injection materials of the above-described embodiments, the relative particle amount of very small particles with a particle diameter of 1.00 μm or less of the mixed active fillers, the fifth to tenth active fillers, is sufficiently large at 9% or more, so that a sufficient amount can be injected into gaps simulating cracks with a width of 0.1 mm in concrete structures, and the injection experiment can be passed.Therefore, with such a geopolymer composition, in a method of repairing cracks in concrete structures using an injector, a sufficient amount can be injected into even the finer details of the cracks than in conventional methods. Furthermore, based on this injection experiment, it was found that in an active filler geopolymer composition that can be injected in sufficient quantity into the fine details of a crack using a general repair method, the relative amount of particles with a particle size of 1.00 μm or less is 9% or more.

[0038] Furthermore, the fifth to tenth injection materials, which are geopolymer compositions of the embodiments described above, are characterized in that the liquid-to-solid ratio of the alkaline solution to the active filler is 0.7 to 0.9. With such geopolymer compositions, mixing becomes difficult, injection with an injector becomes difficult due to high initial viscosity, and bleeding is more likely to occur. In a method of repairing cracks in concrete structures using an injector, a sufficient amount can be injected into even the finest details of the cracks compared to conventional methods.

[0039] <Other Embodiments> In the geopolymer composition of the above embodiment, the alkaline solution is a mixture of an aqueous potassium silicate solution and an aqueous sodium hydroxide solution, but it is not limited to this, and the aqueous solution used as the alkaline solution may be one that is commonly used in geopolymer compositions. For example, it may be at least one of aqueous water glass, aqueous sodium metasilicate, aqueous lithium silicate, aqueous potassium hydroxide, or aqueous lithium hydroxide solution, or it may be a mixture of each in a predetermined volume ratio, a mixture of each in a predetermined weight ratio, or a mixture of each at a predetermined concentration.

[0040] Furthermore, in the geopolymer composition of the above embodiment, the active filler was described as a mixture of fly ash, blast furnace slag powder, and metakaolin, but it is not limited to this and may contain various other substances. For example, it may contain at least one of the following amorphous materials: blast furnace slag powder (JIS 6000 grade, JIS 4000 grade), fly ash (JIS type 2), silica fume, sewage sludge incineration ash, municipal solid waste incineration ash molten slag powder, rice husk charcoal, perlite powder, etc.

[0041] Furthermore, although the geopolymer composition in the above-described embodiment is a mixture of an alkaline solution and an active filler, it is not limited to this, and at least one of a retarder (main component: sodium L-tartrate) or an ether-based shrinkage reducing agent may be added to extend the pot life of the geopolymer composition.

[0042] The present invention has been described above based on embodiments and modifications. However, the embodiments of the invention described above are for the purpose of facilitating understanding of the present invention and do not limit it. The present invention can be modified and improved without departing from its spirit and claims, and the present invention includes equivalents thereof. [Explanation of symbols]

[0043] 10... Jig for injection experiment, 12a, 12b... Acrylic plate, 13... Spacer part, 15... Injection port.

Claims

1. A geopolymer composition for repairing cracks in concrete structures, comprising an alkaline solution mixed with an activated filler containing fly ash or blast furnace slag powder, The active filler has an average particle diameter of 8.20 μm or less, contains particles with a particle diameter greater than 25.00 μm, and the relative particle amount of particles with a particle diameter of 10.00 μm or less is 55% or more, the relative particle amount of particles with a particle diameter of 5.00 μm or less is 39% or more, and the relative particle amount of particles with a particle diameter of 1.00 μm or less is 9% or more. A geopolymer composition characterized in that the liquid-to-solid ratio of the alkaline solution to the active filler is 0.7 to 0.

9.

2. In the geopolymer composition according to claim 1, The geopolymer composition is characterized in that the active filler has a relative particle amount of 11 to 45% of all particles, where the particle size is greater than 10.00 μm and less than or equal to 50.00 μm.

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