Preparation process of anti-chloride-erosion solid waste-based concrete material

Abstract

The application relates to the field of cement materials, and particularly discloses a preparation process of a solid waste-based concrete material resistant to chloride ion erosion, which comprises the following steps: (1) uniformly mixing calcium aluminate cement clinker powder, sodium borohydride powder, nano-iron powder, zinc powder and / or magnesium powder and sodium alginate powder, spraying anhydrous ethanol solution of polyethylene glycol on the obtained mixed powder, uniformly mixing, heating and drying, and then grinding to obtain a slow-release body material; (2) adding the slow-release body material into a coating liquid, uniformly stirring, and then performing spray drying to obtain a slow-release anti-chloride agent; and (3) uniformly stirring a solid waste-based cementitious component, coarse aggregate, fine aggregate, steel fiber, the slow-release anti-chloride agent, a phosphate rust inhibitor and a water reducing agent with mixing water to obtain the solid waste-based concrete material. The application can effectively improve the chloride ion erosion resistance of a concrete structure, reduce the corrosion of metal reinforcers such as steel bars and fibers in the concrete structure, and improve the service life of the concrete structure in a special environment.

Description

Technical Field

[0001] This invention relates to the field of cement materials, and more specifically to a preparation process for a solid waste-based concrete material resistant to chloride ion erosion. Background Technology

[0002] The information disclosed in the background section of this invention is intended only to enhance the understanding of the overall background of this invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Reinforced concrete is the most widely used building material in modern civil engineering. Its excellent compressive strength, combined with the superior tensile strength of steel bars, forms the physical framework supporting modern society. However, the ubiquitous chloride ions in the environment, such as salt in seawater, de-icing salt in winter roads, and soluble salts in saline soils, threaten the safety of reinforced concrete structures. The destructive effect of chloride ions on concrete is a complex and insidious physicochemical process. Chloride ions first penetrate through the pores and microcracks within the concrete, then gradually infiltrate from the outside in through various transport mechanisms such as diffusion and capillary adsorption, reaching the surface of the steel bars or steel fibers and accumulating continuously, causing persistent erosion and reducing the load-bearing capacity of the concrete structure.

[0004] Although the steel reinforcement is initially covered with a passivation film in the highly alkaline pore fluid of concrete, chloride ions have extremely strong penetrating power and depassivation effect. They can locally destroy this protective film, exposing the steel reinforcement matrix. More seriously, the corrosion products can cause volume expansion, easily leading to cracks inside the concrete structure and threatening structural safety. Therefore, improving the concrete material's resistance to chloride ion corrosion is an important measure to enhance the safety and service life of major infrastructure projects such as cross-sea bridges, port terminals, coastal buildings, and highways in special environments. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a preparation process for chloride ion-resistant solid waste-based concrete materials, which can effectively improve the chloride ion erosion resistance of concrete structures, reduce corrosion of metal reinforcements such as steel bars and fibers, and extend the service life of concrete structures in special environments. Specifically, the technical solution of this invention is as follows.

[0006] A preparation process for a chloride ion-resistant solid waste-based concrete material includes the following steps:

[0007] (1) Mix calcium aluminate cement clinker powder, sodium borohydride powder, nano iron powder, zinc powder and / or magnesium powder, sodium alginate powder, and then spray anhydrous ethanol solution of polyethylene glycol into the mixed powder. After mixing, heat and dry, and then grind to obtain the slow-release material.

[0008] (2) Add silane coupling agent to the anhydrous ethanol solution of polyethylene glycol and stir until uniform. Then add nano iron powder and ultrasonically disperse to obtain the coating solution.

[0009] (3) Add the slow-release material to the coating liquid and stir evenly, then spray dry to obtain the slow-release antichlorine agent.

[0010] (4) Take the following raw materials: solid waste-based cementitious components, coarse aggregate, fine aggregate, steel fiber, the aforementioned slow-release chlorine inhibitor, phosphate ester rust inhibitor, sodium stearate and / or stearic acid, and water-reducing agent. Mix the above raw materials evenly, add mixing water and stir until uniform to obtain the solid waste-based concrete material.

[0011] Further, in step (1), the mass ratio of the calcium aluminate cement clinker powder, nano iron powder, zinc powder and / or magnesium powder, and sodium alginate powder is 1~3g:0.25~0.35g:0.3~0.5g:0.1~0.15g. The molar ratio of sodium borohydride to nano iron powder is 1:3.2~3.8. Optionally, the fineness of the zinc powder and / or magnesium powder is not less than 200 mesh.

[0012] Further, in step (1), the mass-to-volume ratio of the mixed powder to the anhydrous ethanol solution of polyethylene glycol is 1 g: 0.14~0.2 ml. Optionally, the mass fraction of polyethylene glycol in the anhydrous ethanol solution is 10~15%.

[0013] Furthermore, in step (1), the heating temperature is 75~85℃ and the drying time is 30~40min.

[0014] Furthermore, in step (1), the fineness of the sustained-release material is 200-280 mesh.

[0015] Further, in step (2), the coating solution contains polyethylene glycol at a mass fraction of 6-11% and silane coupling agent at a mass fraction of 0.5-1.2%. Optionally, the silane coupling agent includes at least one of KH550, KH560, KH570, A151, A171, A172, etc.

[0016] Further, in step (2), the content of nano-iron powder in the coating solution is 2~4 g / L. Optionally, the ultrasonic dispersion treatment time is 10~15 min.

[0017] Further, in step (3), the mass-to-volume ratio of the sustained-release material to the coating liquid is 1g:20~30mL.

[0018] Further, in step (4), the proportions of each component in the raw material are as follows: 140-165 parts by weight of solid waste-based cementitious component, 300-370 parts by weight of coarse aggregate, 180-210 parts by weight of fine aggregate, 15-23 parts by weight of steel fiber, 10-16 parts by weight of the slow-release chlorine inhibitor, 1.4-2.4 parts by weight of phosphate ester rust inhibitor, 4-7.5 parts by weight of sodium stearate and / or stearic acid, and 0.52-0.85 parts by weight of water-reducing agent. Optionally, the mass ratio of the mixing water to the solid waste-based cementitious component is 0.36-0.42:1.

[0019] Further, in step (4), the solid waste-based cementitious component comprises the following raw materials in the following proportions: 70-80 parts by weight of granulated blast furnace slag powder, 5-10 parts by weight of fly ash, 14-20 parts by weight of gypsum, and 3-5 parts by weight of alkali activator. Optionally, the alkali activator comprises at least one of silicate cement clinker, carbide slag powder, and calcium hydroxide powder.

[0020] Further, in step (4), the steel fiber has a length of 5~12mm and a diameter of 0.18~0.23mm.

[0021] Further, in step (4), the phosphate ester rust inhibitor includes at least one of the following: dodecyl phosphate, octyl phosphate, hydroxyethylidene diphosphonic acid, 2-phosphono-1,2,4-tricarboxylic acid butane.

[0022] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0023] This invention first prepares a slow-release material using calcium aluminate cement clinker, sodium borohydride, nano-iron powder, zinc powder and / or magnesium powder, sodium alginate, and polyethylene glycol. Then, a shell layer formed by polyethylene glycol, a silane coupling agent, and nano-iron powder is coated onto its surface. The silane coupling agent not only ensures the uniform distribution of nano-iron powder within the polyethylene glycol and links the two together, but also enhances the hydrophobicity of the shell layer while providing excellent adhesion to the concrete matrix. When this slow-release chloride-resistant agent is added to the concrete structure, as external chloride ions gradually penetrate and accumulate, the nano-iron in the shell layer is first eroded to form ferric / ferrous ions, creating pores in the shell layer. Chloride ions and moisture then enter the slow-release chloride-resistant agent. On one hand, the sodium alginate absorbs water and crosslinks with calcium ions provided by the solid waste-based cementitious components to form a gel-like slow-release material. This not only promotes the absorption of chloride ions but also slows the release of sodium borohydride. On the other hand, the calcium aluminate cement clinker reacts with the introduced chloride ions to form 3CaO·Al2O3·CaCl2·10H2O, thus solidifying the chloride ions and rapidly reducing the chloride ion concentration in the concrete matrix. Furthermore, the sodium borohydride, upon release, can reduce the iron / ferrous ions formed by chloride ion erosion back to more reactive nano-iron, which, acting as a sacrificial agent, preferentially reacts again with the chloride ions that have penetrated the concrete matrix. Additionally, the nano-iron powder in the slow-release material can also preferentially react with the chloride ions that have penetrated the concrete matrix, thereby reducing the erosion of steel bars and steel fibers in the concrete structure. Moreover, the nano-iron powder / nano-iron can also form an electrochemical reaction system with zinc powder and / or magnesium powder in a chloride-provided salt solution environment, reducing the iron / ferrous ions formed by chloride ion erosion back to elemental iron for repeated action. The chloride-resistant agent of this invention provides concrete structures with a longer-lasting resistance to chloride ion erosion through multiple mechanisms, helping to better improve the service life of concrete structures in special environments such as marine and saline-alkali land. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0025] Figure 1 The following is a diagram showing the sustained-release chlorine inhibitor (A) and its compressive strength test results (B) prepared in Example 1.

[0026] Figure 2 The following is a diagram showing the sustained-release chlorine inhibitor (A) and its compressive strength test results (B) prepared in Example 2.

[0027] Figure 3 The following is a chart showing the sustained-release chlorine inhibitor (A) and its compressive strength test results (B) prepared in Example 3.

[0028] Figure 4 The following is a chart showing the sustained-release chlorine inhibitor (A) and compressive strength test results (B) prepared in Example 4.

[0029] Figure 5 The following is a chart showing the sustained-release chlorine inhibitor (A) and its compressive strength test results (B) prepared in Example 5.

[0030] Figure 6 The following is a chart showing the sustained-release chlorine inhibitor (A) and compressive strength test results (B) prepared in Example 6.

[0031] Figure 7 The following is a chart showing the sustained-release chlorine inhibitor (A) and compressive strength test results (B) prepared in Example 7.

[0032] Figure 8 The following is a chart showing the sustained-release chlorine inhibitor (A) and compressive strength test results (B) prepared in Example 8. Detailed Implementation

[0033] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer.

[0034] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as those skilled in the art. The reagents or raw materials used in this invention are readily available through conventional means, and unless otherwise specified, they are used in accordance with conventional methods or product instructions. Furthermore, any methods and materials similar to or equivalent to those described herein can be applied to the methods of this invention. The technical solution of this invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0035] Example 1: A preparation process for a chloride ion-resistant solid waste-based concrete material, comprising the following steps:

[0036] (1) The components were mixed evenly according to the following mass ratios: calcium aluminate cement clinker powder, nano iron powder, zinc powder with a fineness of 200 mesh, and sodium alginate powder = 2.5g:0.3g:0.38g:0.12g, and the molar ratio of sodium borohydride to the nano iron powder was 1:3.5. Then, anhydrous ethanol solution (containing 15% polyethylene glycol (PEG400) by mass fraction) was sprayed onto the resulting mixed powder while stirring, according to a mass-volume ratio of 1g:0.16ml. After stirring evenly, the mixture was heated to 80℃ and dried for 40min. After completion, the mixture was ground and then passed through a 200-mesh sieve to obtain the slow-release material.

[0037] (2) Add silane coupling agent (KH550) to anhydrous ethanol solution of polyethylene glycol (PEG400) and stir until homogeneous. Then add nano-iron powder and ultrasonically disperse for 10 min to obtain a coating solution. Wherein: the mass fraction of polyethylene glycol is 9%, the mass fraction of silane coupling agent (KH550) is 0.85%, and the content of nano-iron powder is 3 g / L.

[0038] (3) The sustained-release material is added to the coating solution of this embodiment, with a mass-to-volume ratio of 1g:20mL. After stirring evenly, it is spray-dried to obtain the sustained-release antichlorine agent (e.g., Figure 1 (As shown in A).

[0039] (4) Take the following raw materials in the following proportions: 152 parts by weight of solid waste-based cementitious component, 330 parts by weight of coarse aggregate, 195 parts by weight of fine aggregate, 20 parts by weight of steel fiber, 14 parts by weight of the slow-release antichlorine agent prepared in this embodiment, 2.1 parts by weight of hydroxyethylidene diphosphonic acid, 6 parts by weight of stearic acid, and 0.75 parts by weight of polycarboxylate superplasticizer. Wherein: the solid waste-based cementitious component is composed of the following raw materials in the following proportions: 78 parts by weight of granulated blast furnace slag powder, 6 parts by weight of fly ash, 18 parts by weight of gypsum, and 4.5 parts by weight of calcium carbide slag powder. The coarse aggregate is crushed stone with a particle size distribution between 10 and 20 mm, the fine aggregate is river sand with a particle size distribution between 2 and 4.5 mm, and the steel fiber has a length of 10 mm and a diameter of 0.22 mm. Add the above raw materials to a mixer and stir for 3 minutes, then add 60.8 parts by weight of mixing water and stir for 2 minutes to obtain the solid waste-based concrete material.

[0040] Performance Testing: 1. The chloride ion migration coefficient D of the solid waste-based concrete material prepared in this embodiment was tested according to the "Standard for Test Methods of Long-Term Performance and Durability of Concrete" (GBT 50082-2024). RCM 2. After preparing the solid waste-based concrete material described in this embodiment into specimens, cure them for 28 days. Then, immerse the specimens in a 3% NaCl solution for 14 days. After removing and drying the specimens, test their compressive strength (e.g., ...). Figure 1 (As shown in B), and then the strength retention rate relative to the specimen not soaked in the NaCl solution was calculated, and the results are as follows: D RCM =0.76×10 12 m 2 / s, strength retention rate = 95.17%.

[0041] Example 2: A preparation process for a chloride ion-resistant solid waste-based concrete material, comprising the following steps:

[0042] (1) The components of calcium aluminate cement clinker powder, nano iron powder, zinc powder with a fineness of 300 mesh, and sodium alginate powder were mixed evenly according to the mass ratio of 1g:0.25g:0.3g:0.1g and the molar ratio of sodium borohydride to the nano iron powder was 1:3.2. Then, anhydrous ethanol solution (of which polyethylene glycol (PEG400) mass fraction was 15%) was sprayed into the resulting mixed powder while stirring at a mass-volume ratio of 1g:0.14ml. After stirring evenly, the mixture was heated to 75℃ and dried for 35min. After completion, the mixture was ground and then passed through a 280-mesh sieve to obtain the slow-release material.

[0043] (2) Add silane coupling agent KH560 to anhydrous ethanol solution of polyethylene glycol (PEG400) and stir until homogeneous. Then add nano-iron powder and ultrasonically disperse for 10 min to obtain a coating solution. Wherein: the mass fraction of polyethylene glycol is 11%, the mass fraction of silane coupling agent KH560 is 1.2%, and the content of nano-iron powder is 4 g / L.

[0044] (3) The sustained-release material is added to the coating solution of this embodiment, with a mass-to-volume ratio of 1g:25mL. After stirring evenly, it is spray-dried to obtain the sustained-release antichlorine agent (e.g., Figure 2 (As shown in A).

[0045] (4) Take the following raw materials in the following proportions: 165 parts by weight of solid waste-based cementitious component, 370 parts by weight of coarse aggregate, 210 parts by weight of fine aggregate, 23 parts by weight of steel fiber, 16 parts by weight of the slow-release antichlorine agent prepared in this embodiment, 2.4 parts by weight of dodecyl phosphate, 7.5 parts by weight of stearic acid, and 0.85 parts by weight of polycarboxylate superplasticizer. Wherein: the solid waste-based cementitious component is composed of the following raw materials in the following proportions: 70 parts by weight of granulated blast furnace slag powder, 5 parts by weight of fly ash, 14 parts by weight of gypsum, and 3 parts by weight of silicate cement clinker. The coarse aggregate is crushed stone with a particle size distribution between 10 and 20 mm, the fine aggregate is river sand with a particle size distribution between 2 and 4.5 mm, and the steel fiber has a length of 5 mm and a diameter of 0.18 mm. Add the above raw materials to a mixer and stir for 3 minutes, then add 69.3 parts by weight of mixing water and stir for 2 minutes to obtain the solid waste-based concrete material.

[0046] Performance testing: The chloride ion migration coefficient D of the solid waste-based concrete material prepared in this embodiment was tested according to the method in Example 1 above. RCM and compressive strength (e.g.) Figure 2 (As shown in B), the strength retention rate was calculated, and the results are as follows: D RCM =0.94×10 12 m 2 / s, strength retention rate = 96.33%.

[0047] Example 3: A preparation process for a chloride ion-resistant solid waste-based concrete material, comprising the following steps:

[0048] (1) The components were mixed evenly according to the following mass ratios: calcium aluminate cement clinker powder, nano iron powder, zinc powder with a fineness of 220 mesh, and sodium alginate powder = 3g:0.35g:0.5g:0.15g, and the molar ratio of sodium borohydride to the nano iron powder was 1:3.8. Then, anhydrous ethanol solution (containing 10% polyethylene glycol (PEG400) by mass fraction) was sprayed onto the resulting mixed powder while stirring, according to a mass-volume ratio of 1g:0.2ml. After stirring evenly, the mixture was heated to 85℃ and dried for 30min. After completion, the mixture was ground and then passed through a 250-mesh sieve to obtain the slow-release material.

[0049] (2) Add silane coupling agent A151 to anhydrous ethanol solution of polyethylene glycol (PEG400) and stir until homogeneous. Then add nano-iron powder and ultrasonically disperse for 15 min to obtain a coating solution. Wherein: the mass fraction of polyethylene glycol is 6%, the mass fraction of silane coupling agent A151 is 0.5%, and the content of nano-iron powder is 2 g / L.

[0050] (3) The sustained-release material is added to the coating solution of this embodiment, with a mass-to-volume ratio of 1g:30mL. After stirring evenly, it is spray-dried to obtain the sustained-release antichlorine agent (e.g., Figure 3 (As shown in A).

[0051] (4) Take the following proportions of raw materials: 140 parts by weight of solid waste-based cementitious component, 300 parts by weight of coarse aggregate, 180 parts by weight of fine aggregate, 15 parts by weight of steel fiber, 10 parts by weight of the slow-release antichlorine agent prepared in this embodiment, 1.4 parts by weight of 2-phosphono-1,2,4-tricarboxylate butane, 4 parts by weight of stearic acid, and 0.52 parts by weight of polycarboxylate superplasticizer. Wherein: the solid waste-based cementitious component is composed of the following proportions of raw materials: 80 parts by weight of granulated blast furnace slag powder, 10 parts by weight of fly ash, 20 parts by weight of gypsum, and 5 parts by weight of calcium hydroxide powder. The coarse aggregate is crushed stone with a particle size distribution between 10 and 20 mm, the fine aggregate is river sand with a particle size distribution between 2 and 4.5 mm, and the steel fiber has a length of 12 mm and a diameter of 0.23 mm. Add the above raw materials to a mixer and stir for 3 minutes, then add 50.4 parts by weight of mixing water and stir for 2 minutes to obtain the solid waste-based concrete material.

[0052] Performance testing: The chloride ion migration coefficient D of the solid waste-based concrete material prepared in this embodiment was tested according to the method in Example 1 above. RCM and compressive strength (e.g.) Figure 3 (As shown in B), the strength retention rate was calculated, and the results are as follows: D RCM =0.81×10 12 m2 / s, strength retention rate = 96.94%.

[0053] Example 4: A preparation process for a chloride-resistant solid waste-based concrete material, the same as in Example 1 above, except that the chloride-resistant agent in this example is prepared using the following method:

[0054] (1) The components of calcium aluminate cement clinker powder, nano iron powder, zinc powder with a fineness of 200 mesh, and sodium alginate powder were mixed evenly in a mass ratio of 2.5g:0.3g:0.38g:0.12g. Then, anhydrous ethanol solution (containing 15% polyethylene glycol (PEG400) by mass fraction) was sprayed onto the resulting mixed powder while stirring, according to a mass-volume ratio of 1g:0.16ml. After stirring evenly, the mixture was heated to 80℃ and dried for 40min. After completion, the mixture was ground and then passed through a 200-mesh sieve to obtain the slow-release material.

[0055] (2) Add silane coupling agent (KH550) to anhydrous ethanol solution of polyethylene glycol (PEG400) and stir until homogeneous. Then add nano-iron powder and ultrasonically disperse for 10 min to obtain a coating solution. Wherein: the mass fraction of polyethylene glycol is 9%, the mass fraction of silane coupling agent (KH550) is 0.85%, and the content of nano-iron powder is 3 g / L.

[0056] (3) The sustained-release material is added to the coating solution of this embodiment, with a mass-to-volume ratio of 1g:20mL. After stirring evenly, it is spray-dried to obtain the sustained-release antichlorine agent (e.g., Figure 4 (As shown in A).

[0057] Performance testing: The chloride ion migration coefficient D of the solid waste-based concrete material prepared in this embodiment was tested according to the method in Example 1 above. RCM and compressive strength (e.g.) Figure 4 (As shown in B), the strength retention rate was calculated, and the results are as follows: D RCM =1.47×10 12 m 2 / s, strength retention rate = 90.23%.

[0058] Example 5: A preparation process for a chloride-resistant solid waste-based concrete material, the same as in Example 3 above, except that the chloride-resistant agent in this example is prepared using the following method:

[0059] (1) The components were mixed evenly according to the mass ratio of calcium aluminate cement clinker powder, nano iron powder, and sodium alginate powder = 3g:0.35g:0.15g, and the molar ratio of sodium borohydride to the nano iron powder was 1:3.8. Then, anhydrous ethanol solution (of which polyethylene glycol (PEG400) mass fraction was 10%) was sprayed into the resulting mixed powder while stirring at a mass-volume ratio of 1g:0.2ml. After stirring evenly, the mixture was heated to 85℃ and dried for 30min. After completion, the mixture was ground and then passed through a 250-mesh sieve to obtain the slow-release material.

[0060] (2) Add silane coupling agent A151 to anhydrous ethanol solution of polyethylene glycol (PEG400) and stir until homogeneous. Then add nano-iron powder and ultrasonically disperse for 15 min to obtain a coating solution. Wherein: the mass fraction of polyethylene glycol is 6%, the mass fraction of silane coupling agent A151 is 0.5%, and the content of nano-iron powder is 2 g / L.

[0061] (3) The sustained-release material is added to the coating solution of this embodiment, with a mass-to-volume ratio of 1g:30mL. After stirring evenly, it is spray-dried to obtain the sustained-release antichlorine agent (e.g., Figure 5 (As shown in A).

[0062] Performance testing: The chloride ion migration coefficient D of the solid waste-based concrete material prepared in this embodiment was tested according to the method in Example 1 above. RCM and compressive strength (e.g.) Figure 5 (As shown in B), the strength retention rate was calculated, and the results are as follows: D RCM =1.72×10 12 m 2 / s, strength retention rate = 88.05%.

[0063] Example 6: A preparation process for a chloride-resistant solid waste-based concrete material, the same as in Example 1 above, except that the chloride-resistant agent in this example is prepared using the following method:

[0064] (1) The components were mixed evenly according to the following mass ratios: calcium aluminate cement clinker powder, nano iron powder, zinc powder with a fineness of 200 mesh, and sodium alginate powder = 2.5g:0.3g:0.38g:0.12g, and the molar ratio of sodium borohydride to the nano iron powder was 1:3.5. Then, anhydrous ethanol solution (containing 15% polyethylene glycol (PEG400) by mass fraction) was sprayed onto the resulting mixed powder while stirring, according to a mass-volume ratio of 1g:0.16ml. After stirring evenly, the mixture was heated to 80℃ and dried for 40min. After completion, the mixture was ground and then passed through a 200-mesh sieve to obtain the slow-release material.

[0065] (2) Add silane coupling agent (KH550) to the anhydrous ethanol solution of polyethylene glycol (PEG400) and stir evenly to obtain a coating solution; wherein the mass fraction of polyethylene glycol is 9% and the mass fraction of silane coupling agent (KH550) is 0.85%.

[0066] (3) The sustained-release material is added to the coating solution of this embodiment, with a mass-to-volume ratio of 1g:20mL. After stirring evenly, it is spray-dried to obtain the sustained-release antichlorine agent (e.g., Figure 6 (As shown in A).

[0067] Performance testing: The chloride ion migration coefficient D of the solid waste-based concrete material prepared in this embodiment was tested according to the method in Example 1 above. RCM and compressive strength (e.g.) Figure 6 (As shown in B), the strength retention rate was calculated, and the results are as follows: D RCM =3.04×10 12 m 2 / s, strength retention rate = 82.41%.

[0068] Example 7: A preparation process for a chloride ion-resistant solid waste-based concrete material, comprising the following steps:

[0069] (1) According to the mass ratio of calcium aluminate cement clinker powder, nano iron powder, zinc powder with a fineness of 300 mesh, and sodium alginate powder = 1g:0.25g:0.3g:0.1g, and the molar ratio of sodium borohydride to the nano iron powder = 1:3.2, the above components are mixed evenly. Then, anhydrous ethanol solution (of which polyethylene glycol (PEG400) has a mass fraction of 15%) is sprayed into the resulting mixed powder while stirring at a mass-volume ratio of 1g:0.14ml. After stirring evenly, the mixture is heated to 75℃ and dried for 35min. After completion, it is ground and then passed through a 280-mesh sieve to obtain the slow-release antichlorine agent (such as...). Figure 7 (As shown in A).

[0070] (2) Take the following raw materials in the following proportions: 165 parts by weight of solid waste-based cementitious component, 370 parts by weight of coarse aggregate, 210 parts by weight of fine aggregate, 23 parts by weight of steel fiber, 16 parts by weight of the slow-release antichlorine agent prepared in this embodiment, 2.4 parts by weight of dodecyl phosphate, 7.5 parts by weight of stearic acid, and 0.85 parts by weight of polycarboxylate superplasticizer. Wherein: the solid waste-based cementitious component is composed of the following raw materials in the following proportions: 70 parts by weight of granulated blast furnace slag powder, 5 parts by weight of fly ash, 14 parts by weight of gypsum, and 3 parts by weight of silicate cement clinker. The coarse aggregate is crushed stone with a particle size distribution between 10 and 20 mm, the fine aggregate is river sand with a particle size distribution between 2 and 4.5 mm, and the steel fiber has a length of 5 mm and a diameter of 0.18 mm. Add the above raw materials to a mixer and stir for 3 minutes, then add 69.3 parts by weight of mixing water and stir for 2 minutes to obtain the solid waste-based concrete material.

[0071] Performance testing: The chloride ion migration coefficient D of the solid waste-based concrete material prepared in this embodiment was tested according to the method in Example 1 above. RCM and compressive strength (e.g.) Figure 7 (As shown in B), the strength retention rate was calculated, and the results are as follows: D RCM =1.93×10 12 m 2 / s, strength retention rate = 86.58%.

[0072] Example 8: A preparation process for a chloride-resistant solid waste-based concrete material, the same as in Example 3 above, except that the chloride-resistant agent in this example is prepared using the following method:

[0073] (1) The components were mixed evenly according to the following mass ratios: calcium aluminate cement clinker powder, nano iron powder, and zinc powder with a fineness of 220 mesh = 3g:0.35g:0.5g, and the molar ratio of sodium borohydride to the nano iron powder was 1:3.8. Then, anhydrous ethanol solution (containing 10% polyethylene glycol (PEG400) by mass fraction) was sprayed onto the resulting mixed powder while stirring, according to a mass-volume ratio of 1g:0.2ml. After stirring evenly, the mixture was heated to 85℃ and dried for 30min. After completion, the mixture was ground and then passed through a 250-mesh sieve to obtain the slow-release material.

[0074] (2) Add silane coupling agent A151 to anhydrous ethanol solution of polyethylene glycol (PEG400) and stir until homogeneous. Then add nano-iron powder and ultrasonically disperse for 15 min to obtain a coating solution. Wherein: the mass fraction of polyethylene glycol is 6%, the mass fraction of silane coupling agent A151 is 0.5%, and the content of nano-iron powder is 2 g / L.

[0075] (3) The sustained-release material is added to the coating solution of this embodiment, with a mass-to-volume ratio of 1g:30mL. After stirring evenly, it is spray-dried to obtain the sustained-release antichlorine agent (e.g., Figure 8 (As shown in A).

[0076] Performance testing: The chloride ion migration coefficient D of the solid waste-based concrete material prepared in this embodiment was tested according to the method in Example 1 above. RCM and compressive strength (e.g.) Figure 8 (As shown in B), the strength retention rate was calculated, and the results are as follows: D RCM =0.98×10 12 m 2 / s, strength retention rate = 91.77%.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A process for the preparation of a solid waste based concrete material resistant to chloride ion attack, characterized in that, The method comprises the following steps: (1) uniformly mixing calcium aluminate cement clinker powder, sodium borohydride powder, nano-iron powder, sodium alginate powder, and zinc powder and / or magnesium powder, then spraying polyethylene glycol anhydrous ethanol liquid in the obtained mixed powder, uniformly mixing, heating and drying, and then grinding to obtain a slow-release material; (2) uniformly stirring silane coupling agent in polyethylene glycol anhydrous ethanol liquid, and then ultrasonic dispersion treatment of nano-iron powder to obtain a coating liquid; (3) uniformly stirring the slow-release material in the coating liquid, and then spray drying to obtain a slow-release chlorine-resistant agent; (4) taking the following raw materials: solid waste-based cementitious component, coarse aggregate, fine aggregate, steel fiber, the slow-release chlorine-resistant agent, phosphate rust inhibitor, sodium stearate and / or stearic acid, and water reducing agent; uniformly mixing the above raw materials, and then uniformly stirring with mixing water to obtain the solid waste-based concrete material.

2. The process for the preparation of anti-chloride attack solid waste based concrete material as claimed in claim 1 wherein, In step (1), the ratio of the calcium aluminate cement clinker powder, nano-iron powder, zinc powder and / or magnesium powder, and sodium alginate powder is 1-3 g:0.25-0.35 g:0.3-0.5 g:0.1-0.15 g; the molar ratio of sodium borohydride to nano-iron powder is 1:3.2-3.8; or, in step (1), the fineness of the zinc powder and / or magnesium powder is not less than 200 mesh.

3. The process for producing a chloride resistant solid waste based concrete material as claimed in claim 1 wherein, In step (1), the ratio of the mixed powder to polyethylene glycol anhydrous ethanol liquid is 1 g:0.14-0.2 ml.

4. The process for producing a chloride resistant solid waste based concrete material as claimed in claim 1 wherein, The mass fraction of polyethylene glycol in the anhydrous ethanol liquid is 10-15%; Or, in step (1), the heating temperature is 75-85°C, and the drying time is 30-40 min; Or, in step (1), the fineness of the slow-release material is 200-280 mesh.

5. The process of producing a chloride resistant solid waste based concrete material as claimed in claim 1, wherein, In step (2), the mass fraction of polyethylene glycol in the coating liquid is 6-11%, and the mass fraction of silane coupling agent is 0.5-1.2%.

6. The process of producing a chloride resistant solid waste based concrete material as claimed in claim 1, wherein, In step (2), the content of nano-iron powder in the coating liquid is 2-4 g / L; Or, in step (2), the ultrasonic dispersion treatment time is 10-15 min; Or, in step (2), the silane coupling agent comprises at least one of KH550, KH560, KH570, A151, A171, and A172.

7. The process of producing a chloride resistant solid waste based concrete material as claimed in claim 1 wherein, In step (3), the mass-volume ratio of the slow-release material to the coating liquid is 1 g:20-30 mL; Or, in step (4), the length of the steel fiber is 5-12 mm, and the diameter is 0.18-0.23 mm; Or, in step (4), the phosphate rust inhibitor comprises at least one of dodecyl phosphate, octyl phosphate, hydroxyethylidene diphosphonic acid, and 2-phosphono-1,2,4-butane tricarboxylic acid.

8. The process for the production of a chloride attack resistant solid waste based concrete material according to any one of claims 1-7, characterized in that, In step (4), the proportions of the components in the raw materials are as follows: 140-165 parts by weight of the solid-waste-based cementitious component, 300-370 parts by weight of the coarse aggregate, 180-210 parts by weight of the fine aggregate, 15-23 parts by weight of the steel fiber, 10-16 parts by weight of the slow-release chlorine-resistant agent, 1.4-2.4 parts by weight of the phosphate rust inhibitor, 4-7.5 parts by weight of sodium stearate and / or stearic acid, and 0.52-0.85 parts by weight of the water-reducing agent; or, in step (4), the mass ratio of the mixing water to the solid-waste-based cementitious component is 0.36-0.42:

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9. The process for producing a chloride-resistant solid waste-based concrete material according to any one of claims 1 to 7, characterized in that, In step (4), the solid-waste-based cementitious component comprises the following proportions of raw materials: 70-80 parts by weight of granulated blast furnace slag powder, 5-10 parts by weight of fly ash, 14-20 parts by weight of gypsum, and 3-5 parts by weight of the alkali activator.

10. The process for producing a chloride resistant solid waste based concrete material as claimed in claim 9 wherein, The alkali activator comprises at least one of the following: Portland cement clinker, carbide slag powder, and calcium hydroxide powder.

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