Cement-free binder using reverse osmosis seawater concentrate and manufacturing method thereof

Abstract

The present invention relates to a cement-free binder and, more specifically, to a cement-free binder capable of shielding neutrons using reverse osmosis seawater concentrate and a manufacturing method thereof. The present PCT patent application has been filed with the support of 'IP advancement and commercialization for promoting eco-friendly construction materials business of blast furnace slag-based composition and its hardened body technology' based on the 2024 University Technology Management Promotion Project (IP Star Scientist Support-Type), which is the National Research and Development Project funded by the Ministry of Science and ICT of the Republic of Korea. In addition, the present PCT patent application has been filed with the support of 'Improvement of interlayer bonding strength in 3D concrete printing for construction using electrophoretic deposition process' (Project Number: RS-2023-00245603), which is the Creative and Challenging Research-based Support Project funded by the Ministry of Education (Support agency: National Research Foundation of Korea).

Description

Cement-free binder using reverse osmosis seawater concentrate and its manufacturing method

[0001] The present invention relates to a cementless binder, and more particularly, to a cementless binder capable of neutron shielding using reverse osmosis seawater concentrate and a method for manufacturing the same.

[0002] Radiation possesses high energy and can alter the properties of matter. In particular, exposure to strong radiation or absorption of radioactive materials that emit radiation can damage cells and their DNA. Among radiation types, gamma rays and neutron rays have strong penetrability, requiring the greatest care when shielding. Neutron rays, in particular, are generated from various sources, including neutrons produced during nuclear fission, the radioactive decay of fission products, neutrons generated by alpha particle collisions, and photoneutrons. Compared to gamma rays, shielding them is much more difficult.

[0003] Lead is the most commonly used material for existing γ-ray shielding materials, but lead is a heavy metal that, when accumulated in the human body, causes lead poisoning symptoms, which is harmful to the human body. Existing neutron shielding materials are made of polyethylene, which is highly vulnerable to heat, and in case of fire, irritating gases, toxic gases, flammable vapors, carbon monoxide, and carbon dioxide are generated through thermal decomposition and combustion.

[0004] Accordingly, there is a need for the development of neutron shielding materials that are inexpensive, easy to process, and have secured neutron absorption / shielding performance, and there is a great need for new materials that can complement the shortcomings of various radiation / neutron shielding materials.

[0005] (Prior art document) Republic of Korea Patent Publication No. 10-1938528

[0006] The purpose of the present invention is to provide a new construction material that can replace existing concrete and has a neutron shielding function while utilizing unused industrial byproduct resources such as RO (Reverse Osmosis) concentrated wastewater and fly ash from thermal power plants.

[0007] The purposes of the present invention are not limited to those mentioned above, and other purposes not mentioned will be clearly understood from the description below.

[0008] A cement-free binder composition according to one embodiment of the present invention comprises a binder containing fly ash, calcium hydroxide (Ca(OH)2), sodium carbonate (Na2CO3), and an accelerator; and reverse osmosis (RO) concentrated seawater, wherein the concentrated seawater may accelerate the depletion of the calcium hydroxide.

[0009] The above fly ash may include SiO2, Al2O3, CaO and Fe2O3, and the fly ash may have a content distributed in the order of SiO2, Al2O3, CaO and Fe2O3.

[0010] The above fly ash may be composed of SiO2, Al2O3, CaO, Fe2O3, MgO, TiO2, P2O5, K2O, Na2O, SO3, SrO, BaO, ZrO2, MnO, V2O5, ZnO, Cr2O3, CuO, NiO, Y2O3, and Ga2O3.

[0011] The above promoter is sucrose (C 12 H 22 O 11 ), sodium citrate, sodium tartrate, and sodium gluconate.

[0012] The binder may be composed of 100 parts by weight of the fly ash, 25 parts by weight of the calcium hydroxide, 10 parts by weight of the sodium carbonate, and 0.5 parts by weight of the accelerator.

[0013] The seawater concentrate may be 40 parts by weight relative to 100 parts by weight of the binder.

[0014] The above seawater concentrate contains sodium ions (Na + ) 19079 ppm and chloride ion (Cl - ) may contain 38600 ppm.

[0015]

[0016] In addition, a method for manufacturing a cement-free binder according to one embodiment of the present invention includes the steps of preparing a binder mixture by mixing fly ash, calcium hydroxide (Ca(OH)2), sodium carbonate (Na2CO3), and an accelerator; the step of manufacturing a cement-free binder composition by adding reverse osmosis (RO) concentrated seawater to the binder mixture; and the step of hardening the cement-free binder composition, wherein the concentrated seawater may accelerate the exhaustion of the calcium hydroxide.

[0017] The above fly ash may include SiO2, Al2O3, CaO and Fe2O3, and the fly ash may have a content distributed in the order of SiO2, Al2O3, CaO and Fe2O3.

[0018] The above fly ash may be composed of SiO2, Al2O3, CaO, Fe2O3, MgO, TiO2, P2O5, K2O, Na2O, SO3, SrO, BaO, ZrO2, MnO, V2O5, ZnO, Cr2O3, CuO, NiO, Y2O3, and Ga2O3.

[0019] The above promoter is sucrose (C 12 H 22 O 11), sodium citrate, sodium tartrate, and sodium gluconate.

[0020] The binder may be composed of 100 parts by weight of the fly ash, 25 parts by weight of the calcium hydroxide, 10 parts by weight of the sodium carbonate, and 0.5 parts by weight of the accelerator.

[0021] The seawater concentrate may be 40 parts by weight relative to 100 parts by weight of the binder.

[0022] The above seawater concentrate contains sodium ions (Na + ) 19079 ppm and chloride ion (Cl - ) may contain 38600 ppm.

[0023] The present invention has the effect of providing a cement-free binder with improved physical properties using reverse osmosis seawater concentrate.

[0024] In addition, the present invention has the effect of providing a cementless bonding material capable of neutron shielding.

[0025] The technical effects of the present invention are not limited to those mentioned above, and other technical effects not mentioned will be clearly understood by those skilled in the art from the description below.

[0026] Figure 1a illustrates the results of particle size analysis of raw fly ash according to one embodiment of the present invention.

[0027] Figure 1b illustrates the results of XRD (X-ray diffraction) analysis of raw fly ash according to one embodiment of the present invention.

[0028] Figure 2 illustrates the results of measuring the compressive strength of a cement-free binder according to one embodiment of the present invention.

[0029] Figure 3a shows the XRD analysis results of a cement-free binder according to a comparative example of the present invention.

[0030] Figure 3b illustrates the XRD analysis results of a cementless binder according to one embodiment of the present invention.

[0031] Figure 4a illustrates the results of thermogravimetric analysis (TGA) of a cement-free binder according to a comparative example of the present invention.

[0032] Figure 4b illustrates the results of thermogravimetric analysis (TGA) of a cement-free binder according to one embodiment of the present invention.

[0033] Figure 5a illustrates the MIP analysis results by curing date for a cement-free binder according to one embodiment of the present invention.

[0034] Figure 5b illustrates the MIP analysis results by curing date for a cement-free binder according to one embodiment of the present invention.

[0035] Figure 6 illustrates a schematic diagram of a neutron shielding performance experiment according to one embodiment of the present invention.

[0036] Figure 7 is a linear attenuation coefficient (μ) according to one embodiment of the present invention. linear ) and mass attenuation coefficient (μ mass ) shows the results of the analysis.

[0037] Figure 8a illustrates the results of a mean free path (MFP) analysis according to one embodiment of the present invention.

[0038] Figure 8b illustrates the results of a half-value layer (HVL) analysis according to one embodiment of the present invention.

[0039] Figure 8c illustrates the results of a tenth-value layer (TVL) analysis according to one embodiment of the present invention.

[0040] Figure 9 illustrates the results of thermal neutron shielding rate analysis according to one embodiment of the present invention.

[0041] A cement-free binder composition according to one embodiment of the present invention comprises a binder containing fly ash, calcium hydroxide (Ca(OH)2), sodium carbonate (Na2CO3), and an accelerator; and reverse osmosis (RO) concentrated seawater, wherein the concentrated seawater may accelerate the depletion of the calcium hydroxide.

[0042] The above fly ash may include SiO2, Al2O3, CaO and Fe2O3, and the fly ash may have a content distributed in the order of SiO2, Al2O3, CaO and Fe2O3.

[0043] The above fly ash may be composed of SiO2, Al2O3, CaO, Fe2O3, MgO, TiO2, P2O5, K2O, Na2O, SO3, SrO, BaO, ZrO2, MnO, V2O5, ZnO, Cr2O3, CuO, NiO, Y2O3, and Ga2O3.

[0044] The above promoter is sucrose (C 12 H 22 O 11 ), sodium citrate, sodium tartrate, and sodium gluconate.

[0045] The binder may be composed of 100 parts by weight of the fly ash, 25 parts by weight of the calcium hydroxide, 10 parts by weight of the sodium carbonate, and 0.5 parts by weight of the accelerator.

[0046] The seawater concentrate may be 40 parts by weight relative to 100 parts by weight of the binder.

[0047] The above seawater concentrate contains sodium ions (Na +) 19079 ppm and chloride ion (Cl - ) may contain 38600 ppm.

[0048]

[0049] In addition, a method for manufacturing a cement-free binder according to one embodiment of the present invention includes the steps of preparing a binder mixture by mixing fly ash, calcium hydroxide (Ca(OH)2), sodium carbonate (Na2CO3), and an accelerator; the step of manufacturing a cement-free binder composition by adding reverse osmosis (RO) concentrated seawater to the binder mixture; and the step of hardening the cement-free binder composition, wherein the concentrated seawater may accelerate the exhaustion of the calcium hydroxide.

[0050] The above fly ash may include SiO2, Al2O3, CaO and Fe2O3, and the fly ash may have a content distributed in the order of SiO2, Al2O3, CaO and Fe2O3.

[0051] The above fly ash may be composed of SiO2, Al2O3, CaO, Fe2O3, MgO, TiO2, P2O5, K2O, Na2O, SO3, SrO, BaO, ZrO2, MnO, V2O5, ZnO, Cr2O3, CuO, NiO, Y2O3, and Ga2O3.

[0052] The above promoter may promote the formation of a calcium complex based on calcium ion (Ca+) of the above calcium hydroxide, and the promoter may be sucrose (C 12 H 22 O 11 ), sodium citrate, sodium tartrate, and sodium gluconate.

[0053] The binder may be composed of 100 parts by weight of the fly ash, 25 parts by weight of the calcium hydroxide, 10 parts by weight of the sodium carbonate, and 0.5 parts by weight of the accelerator.

[0054] The seawater concentrate may be 40 parts by weight relative to 100 parts by weight of the binder.

[0055] The above seawater concentrate contains sodium ions (Na + ) 19079 ppm and chloride ion (Cl - ) may contain 38600 ppm.

[0056] Hereinafter, embodiments of the present invention will be described in detail to facilitate easy implementation by those skilled in the art. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. Furthermore, like reference numbers represent like elements throughout the specification.

[0057]

[0058] A cement-free binder composition according to one embodiment of the present invention includes a binder containing fly ash, calcium hydroxide (Ca(OH)2), sodium carbonate (Na2CO3), and an accelerator; and seawater concentrate.

[0059] The above fly ash may be composed of silicon dioxide (SiO2) and aluminum oxide (Al2O3) as main materials, and more specifically, the fly ash may be composed of silicon dioxide (SiO2) and aluminum oxide (Al2O3) accounting for more than half of the total fly ash content.

[0060] The above fly ash may include SiO2, Al2O3, CaO and Fe2O3, and the fly ash may have a content distributed in the order of SiO2, Al2O3, CaO and Fe2O3.

[0061] The above fly ash may be composed of SiO2, Al2O3, CaO, Fe2O3, MgO, TiO2, P2O5, K2O, Na2O, SO3, SrO, BaO, ZrO2, MnO, V2O5, ZnO, Cr2O3, CuO, NiO, Y2O3, and Ga2O3.

[0062] The above promoter may promote the formation of a calcium complex based on calcium ion (Ca+) of the above calcium hydroxide, and the promoter may be sucrose (C 12 H 22 O 11 ), sodium citrate, sodium tartrate, and sodium gluconate.

[0063] The binder may be composed of 100 parts by weight of the fly ash, 25 parts by weight of the calcium hydroxide, 10 parts by weight of the sodium carbonate, and 0.5 parts by weight of the accelerator.

[0064] The seawater concentrate may be 40 parts by weight relative to 100 parts by weight of the binder.

[0065] The above seawater concentrate may be seawater using reverse osmosis, and may be seawater wastewater resulting from reverse osmosis. The above seawater concentrate may promote the depletion of the calcium hydroxide, and the above seawater concentrate may contain 19079 ppm of sodium ions (Na+) and 19079 ppm of chloride ions (Cl - ) contains 38600 ppm.

[0066]

[0067] A method for manufacturing a cement-free binder according to one embodiment of the present invention comprises the steps of: preparing a binder mixture by mixing fly ash, calcium hydroxide (Ca(OH)2), sodium carbonate (Na2CO3), and an accelerator; adding concentrated seawater to the binder mixture to manufacture a cement-free binder composition; and hardening the cement-free binder composition.

[0068] The above fly ash may be composed of silicon dioxide (SiO2) and aluminum oxide (Al2O3) as main materials, and more specifically, the fly ash may be composed of silicon dioxide (SiO2) and aluminum oxide (Al2O3) accounting for more than half of the total fly ash content.

[0069] The above fly ash may include SiO2, Al2O3, CaO and Fe2O3, and the fly ash may have a content distributed in the order of SiO2, Al2O3, CaO and Fe2O3.

[0070] The above fly ash may be composed of SiO2, Al2O3, CaO, Fe2O3, MgO, TiO2, P2O5, K2O, Na2O, SO3, SrO, BaO, ZrO2, MnO, V2O5, ZnO, Cr2O3, CuO, NiO, Y2O3, and Ga2O3.

[0071] The above promoter may promote the formation of a calcium complex based on calcium ion (Ca+) of the above calcium hydroxide, and the promoter may be sucrose (C 12 H 22 O 11 ), sodium citrate, sodium tartrate, and sodium gluconate.

[0072] The binder may be composed of 100 parts by weight of the fly ash, 25 parts by weight of the calcium hydroxide, 10 parts by weight of the sodium carbonate, and 0.5 parts by weight of the accelerator.

[0073] The seawater concentrate may be 40 parts by weight relative to 100 parts by weight of the binder.

[0074] The above seawater concentrate may be seawater using reverse osmosis, and may be seawater wastewater resulting from reverse osmosis. The above seawater concentrate may promote the depletion of the calcium hydroxide, and the above seawater concentrate may contain 19079 ppm of sodium ions (Na+) and 19079 ppm of chloride ions (Cl - ) may contain 38600 ppm.

[0075]

[0076] Hereinafter, the present invention will be described in detail through examples. The following examples are intended only to facilitate understanding of the present invention and are not intended to limit the invention.

[0077]

[0078] Preparation Example 1. Preparation of fly ash

[0079] Fly ash (coal ash) having the composition shown in Table 1 below was prepared.

[0080] Fly AshOxideWeight %SiO248.94Al2O326.57CaO8.25Fe2O37.22MgO1.58TiO21.56P2O51.45K2O1.30Na2O1.23SO31.06SrO0. 26BaO0.26ZrO20.08MnO0.08V2O50.05ZnO0.02Cr2O30.02CuO0.02NiO0.02Y2O30.01Ga2O30.01Sum99.99

[0081]

[0082] Experimental Example 1. Particle size analysis and XRD analysis

[0083] The particle size analysis results and XRD (X-ray diffraction) analysis results of the fly ash in the above Preparation Example 1 are shown in Figs. 1a and 1b. Fig. 1a shows the particle size analysis results of the fly ash (Raw Fly ash) in the above Preparation Example 1. Fig. 1b shows the XRD analysis results of the fly ash (Raw Fly ash) in the above Preparation Example 1.

[0084]

[0085] Preparation Example 2. Preparation of seawater concentrate

[0086] Reverse osmosis (RO) concentrated seawater (RO wastewater) having the composition shown in Table 2 below was prepared.

[0087] Na + (ppm)K + (ppm)Mg 2+ (ppm)Ca 2+ (ppm)Cl - (ppm)SO4 2- (ppm)190796222664852386006700

[0088]

[0089] Experimental Example 2. Water Quality Analysis of Concentrated Seawater

[0090] For the seawater concentration in the above Preparation Example 2, water quality analysis was performed according to the Korean standard method for marine environment (2018) and APHA Standard Methods (2017), and the analysis results are summarized in Table 3 below.

[0091] ParametersUnitsSeawater ConcentrateWater Quality StandardMethodspH-7.797.8-8.3Korean standard method for marine environment (2018)Chemical Oxygen Demand(COD)mg / L2.8< 1Suspended Solids(SS)mg / L12< 10Total Nitrogen(TN)mg / L0.677< 0.05Total Solids(TS)mg / L76100< 500Electrical Conductivity(EC)μS / cm115750< 1000APHA Standard Methods (2017)Total Dissolved Solids(TDS)mg / L75800< 500

[0092]

[0093] Manufacturing Example 1. Cement-free binder mix

[0094] Fly ash, potassium hydroxide (Ca(OH)2), sodium carbonate (Na2CO3), sucrose (C) of the above preparation example 1 12 H 22 O 11 ) was mixed in the mixing ratio shown in Table 4 below to manufacture a binder.

[0095] Fly ash Ca(OH)2Na2CO3C 12 H 22 O 11 100 g25 g10 g0.5 g

[0096]

[0097] Comparative Example: Manufacturing Cementless Binder Using Deionized Water

[0098] For 100 parts by weight (135.5 g) of the mixture of the above manufacturing example 1, 40 parts by weight (54.2 g) of deionized water was mixed, and then a cement-free binder was manufactured at a curing temperature of 70°C for 1 day (24 hours).

[0099]

[0100] Example. Manufacturing of cement-free binder using seawater concentrate.

[0101] After mixing 40 parts by weight (54.2 g) of the seawater concentrate of Preparation Example 2 with 100 parts by weight (135.5 g) of the mixture of Preparation Example 1, a cement-free binder was prepared at a curing temperature of 70°C for 1 day (24 hours). At this time, Cl contained in the seawater concentrate - The content of ions accounts for 1.54 wt% of the total weight of the cement-free binder.

[0102]

[0103] Experimental Example 2. Compressive Strength Analysis

[0104] Compressive strength analysis was performed on the cementless binders manufactured in the comparative examples and examples above, and analyses were performed on the first day (1d), third day (3d), seventh day (7d), and twenty-eighth day (28d) of curing, respectively. The analysis results are shown in Fig. 2, and in Fig. 2, the cementless binder manufactured in the comparative examples above is indicated as "FA-NC-W", and the cementless binder manufactured in the examples above is indicated as "FA-NC-R".

[0105]

[0106] Referring to Fig. 2, it can be confirmed that the compressive strength of the cement-free binder manufactured in the above example is superior to that of the comparative example.

[0107]

[0108] Experimental Example 3. XRD Analysis

[0109] XRD (X-ray Diffraction) analysis was performed on each of the cement-free binders manufactured in the comparative examples and examples above according to the curing dates, and the analysis results are shown in Figs. 3a and 3b, respectively. Fig. 3a shows the XRD analysis results for the cement-free binder manufactured in the comparative examples above, and Fig. 3b shows the XRD analysis results for the cement-free binder manufactured in the examples above.

[0110] In Fig. 3a, the cementless binder manufactured in the comparative example was indicated as "FA-NC-W at 1 day" on the 1st day of curing, "FA-NC-W at 3 days" on the 3rd day of curing, "FA-NC-W at 7 days" on the 7th day of curing, and "FA-NC-W at 28 days" on the 28th day of curing. In Fig. 3b, the cementless binder manufactured in the example was indicated as "FA-NC-R at 1 day" on the 1st day of curing, "FA-NC-R at 3 days" on the 3rd day of curing, "FA-NC-R at 7 days" on the 7th day of curing, and "FA-NC-R at 28 days" on the 28th day of curing.

[0111] Referring to FIGS. 3a and 3b, in the case of FIG. 3b using reverse osmosis seawater concentrate, compared to FIG. 3a, it can be confirmed that the peak intensity of calcium hydroxide (Ca(OH)2) is weaker as the rate of calcium hydroxide (Ca(OH)2) depletion is accelerated, which confirms that the compressive strength of the cement-free binder manufactured in the example in FIG. 2 is improved.

[0112]

[0113] Experimental Example 4. Thermogravimetric Analysis (TGA)

[0114] Thermogravimetric analysis (TGA) was performed on the cement-free binders manufactured in the comparative examples and examples at each curing date, and the analysis results are shown in Figs. 4a and 4b, respectively. Fig. 4a shows the thermogravimetric analysis results for the cement-free binder manufactured in the comparative examples, and Fig. 4b shows the thermogravimetric analysis results for the cement-free binder manufactured in the examples.

[0115] In Fig. 4a, the cementless binder manufactured in the comparative example was indicated as "FA-NC-W at 1 day" on the 1st day of curing, "FA-NC-W at 3 days" on the 3rd day of curing, "FA-NC-W at 7 days" on the 7th day of curing, and "FA-NC-W at 28 days" on the 28th day of curing. In Fig. 4b, the cementless binder manufactured in the example was indicated as "FA-NC-R at 1 day" on the 1st day of curing, "FA-NC-R at 3 days" on the 3rd day of curing, "FA-NC-R at 7 days" on the 7th day of curing, and "FA-NC-R at 28 days" on the 28th day of curing.

[0116] Referring to FIGS. 4a and 4b, the cementless binder manufactured in the above example promotes the consumption of calcium hydroxide (Ca(OH)2) (see curing day 1, curing day 3), which is consistent with the XRD analysis results in (b) of FIG. 3. In addition, it can be confirmed that the formation of a peak around 100°C corresponding to CSH, which is the main factor in the development of compressive strength, relatively increases in the cementless binder manufactured in the above example (see curing days 1, 3, and 7). The peak corresponding to general calcite is 500 to 650°C, and well-crystalline calcite is around 800°C. The occurrence of well-crystalline calcite has been reported to have a positive effect on the development of compressive strength, and since a peak corresponding to well-crystalline calcite was generated when concentrated seawater was used in the example, it can be expected that this also had an effect on the improvement of compressive strength.

[0117]

[0118] Experimental Example 5. MIP Analysis

[0119] MIP (mercury intrusion porosimetry) analysis was performed on the cement-free binders manufactured in the comparative examples and examples according to the curing days, and the analysis results are shown in Figs. 5a and 5b, and the total porosity is summarized in Table 5 below. In Figs. 5a and 5b, the cement-free binder manufactured in the comparative examples is indicated as "FA-NC-W", and the cement-free binder manufactured in the examples is indicated as "FA-NC-R". Fig. 5a shows the MIP analysis results on the third day (3 days) of curing, and Fig. 5b shows the MIP analysis results on the 28th day (28 days) of curing.

[0120] Curing days Total porosity (%) Comparative example 327.172818.35 Exemplary example 325.64289.75

[0121] Referring to Fig. 5 and Table 5, it can be confirmed that the porosity of the cement-free binder manufactured in the above embodiment has decreased.

[0122]

[0123] Experimental Example 6. Evaluation of Thermal Neutron Shielding Performance

[0124] 150 x 150 x 50 mm on the 7th day of curing of the cement-free binder manufactured in the above comparative examples and examples 3 A rectangular concrete sample was manufactured and a neutron shielding performance measurement experiment was conducted.

[0125] Measurement of neutron shielding performance 241 Am-Be (neutron energy emission rate: 1.227 x 10 7 s -1) was used as a neutron source, and the source was positioned inside a high purity graphite block as in Fig. 6, a rectangular prism specimen (concrete sample) was positioned on one side of the graphite block, and an experiment was conducted after slowing fast neutrons to thermal neutrons using a thermal neutron detector composed of a cadmium cover.

[0126] Linear attenuation coefficient (μ) expressed by Equation 1 below for the 7th day of curing of the cement-free binder manufactured in the comparative examples and examples above linear ) and the mass attenuation coefficient (μ) expressed by Equation 2 below. mass ) is shown in Fig. 7. In Fig. 7, the cementless bonding material manufactured in the comparative example is indicated as “FA-NC-W”, and the cementless bonding material manufactured in the example is indicated as “FA-NC-R”.

[0127] [Formula 1]

[0128]

[0129] In Equation 1, S th is the thermal neutron counting rate passing through the specimen (s -1 ) and R air is the thermal neutron counting rate at air without the specimen (s -1 )am.

[0130] [Formula 2]

[0131]

[0132] In Equation 2, ρ is the density of the binder.

[0133]

[0134] The mean free path (MFP) expressed by Equation 3 below, which is calculated from the linear attenuation coefficient of Equation 1, the half-value layer (HVL) expressed by Equation 4 below, and the tenth-value layer (TVL) expressed by Equation 5 below, for the 7th day of curing of the cementless binders manufactured in the comparative examples and examples, are shown in FIGS. 8a to 8c. In FIGS. 8a to 8c, the cementless binder manufactured in the comparative examples is indicated as "FA-NC-W", and the cementless binder manufactured in the examples is indicated as "FA-NC-R". FIG. 8a is for the mean free path, FIG. 8b is for the half-value layer, and FIG. 8c is for the tenth-value layer.

[0135] [Formula 3]

[0136]

[0137] [Formula 4]

[0138]

[0139] [Formula 5]

[0140]

[0141] The thermal neutron shielding efficiency (%), expressed by Equation 6 below and calculated from the linear attenuation coefficient of Equation 1, was calculated for the 7th day of curing of the cementless binder manufactured in the comparative examples and examples, and the results are shown in Fig. 9. In Fig. 9, the cementless binder manufactured in the comparative examples is indicated as "FA-NC-W", and the cementless binder manufactured in the examples is indicated as "FA-NC-R".

[0142] [Formula 6]

[0143]

[0144] Referring to Fig. 9, it can be confirmed that the cement-free binder manufactured in the above example has a neutron shielding rate of 98.76%.

[0145]

[0146] Experimental Example 7. Fabrication and Evaluation of Thermal Neutron Shielding Bricks

[0147] Bricks were manufactured using the cement-free binder manufactured in the above example, and the water absorption of the manufactured bricks was analyzed and summarized in Table 6 below, and the results of the heavy metal leaching test (TCLP) were summarized in Table 7 below.

[0148] BrickMass of saturated-surface-dry, m0(g)Mass of absolute dry, m1 (g)Water absorption(%)Example 1886.41697.511.13

[0149]

[0150] In Table 6, the moisture absorption rate was calculated using the saturated-surface-dry mass of the brick (m0) and the absolute dry mass of the brick (m1).

[0151] ElementRegulated Level (ppm)Concentration (ppm)After the immersion leaching testTCLP1 day1 week1 monthArsenic (As)5N.DNDND0.002Cadmium (Cd)1N.DNDNDNDChromium (Cr)5N.DNDND0.001Mercury (Hg)0.2NDNDND0.001Lead (Pb)5N.DNDND0.006

[0152]

[0153] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

Claims

1. A binder containing fly ash, calcium hydroxide (Ca(OH)2), sodium carbonate (Na2CO3) and an accelerator; and Contains reverse osmosis (RO) seawater concentrate, The above seawater concentrate promotes the depletion of the calcium hydroxide. Cementless binder composition.

2. In paragraph 1, The above fly ash contains SiO2, Al2O3, CaO and Fe2O3. Cementless binder composition.

3. In paragraph 2, The above fly ash is distributed in the order of SiO2, Al2O3, CaO and Fe2O3. Cementless binder composition.

4. In paragraph 1, The above fly ash is composed of SiO2, Al2O3, CaO, Fe2O3, MgO, TiO2, P2O5, K2O, Na2O, SO3, SrO, BaO, ZrO2, MnO, V2O5, ZnO, Cr2O3, CuO, NiO, Y2O3 and Ga2O3. Cementless binder composition.

5. In paragraph 1, The above promoter is sucrose (C 12 H 22 O 11 ), sodium citrate, sodium tartrate and sodium gluconate, one or more substances selected from the group consisting of Cementless binder composition.

6. In paragraph 1, The binder is composed of 100 parts by weight of the fly ash, 25 parts by weight of the calcium hydroxide, 10 parts by weight of the sodium carbonate, and 0.5 parts by weight of the accelerator. Cementless binder composition.

7. In paragraph 1, The seawater concentrate is 40 parts by weight relative to 100 parts by weight of the binder. Cementless binder composition.

8. In paragraph 1, The above seawater concentrate contains sodium ions (Na + ) 19079 ppm and chloride ion (Cl - ) containing 38600 ppm, Cementless binder composition.

9. Fly ash, calcium hydroxide (Ca(OH)2), sodium carbonate (Na2CO3) and sucrose (C 12 H 22 O 11 ) preparing a binder mixture; A step of preparing a cement-free binder composition by adding reverse osmosis (RO) seawater concentrate to the above binder mixture; and Comprising a step of hardening the above cement-free bonding composition, The above seawater concentrate promotes the depletion of the calcium hydroxide. Method for manufacturing cement-free binder.

10. In paragraph 9, The above fly ash contains SiO2, Al2O3, CaO and Fe2O3. Method for manufacturing cement-free binder.

11. In paragraph 10, The above fly ash is distributed in the order of SiO2, Al2O3, CaO and Fe2O3. Method for manufacturing cement-free binder.

12. In paragraph 9, The above fly ash is composed of SiO2, Al2O3, CaO, Fe2O3, MgO, TiO2, P2O5, K2O, Na2O, SO3, SrO, BaO, ZrO2, MnO, V2O5, ZnO, Cr2O3, CuO, NiO, Y2O3 and Ga2O3. Method for manufacturing cement-free binder.

13. In paragraph 9, The above promoter is sucrose (C 12 H 22 O 11 ), sodium citrate, sodium tartrate and sodium gluconate, one or more substances selected from the group consisting of Method for manufacturing cement-free binder.

14. In paragraph 9, The binder is composed of 100 parts by weight of the fly ash, 25 parts by weight of the calcium hydroxide, 10 parts by weight of the sodium carbonate, and 0.5 parts by weight of the accelerator. Method for manufacturing cement-free binder.

15. In paragraph 9, The seawater concentrate is 40 parts by weight relative to 100 parts by weight of the binder. Method for manufacturing cement-free binder.

16. In paragraph 9, The above seawater concentrate contains sodium ions (Na + ) 19079 ppm and chloride ion (Cl - ) containing 38600 ppm, Method for manufacturing cement-free binder.

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