Anti-corrosion, anti-seepage and anti-sulfur concrete

Abstract

The invention provides anti-corrosion, anti-seepage and anti-sulfur concrete which is prepared from the following components in parts by weight: 210 to 220 parts of Portland cement, 120 to 130 parts of water, 770 to 780 parts of broken stone with the particle size of 15 to 25 mm, 450 to 460 parts of broken stone with the particle size of 8 to 12 mm, 430 to 440 parts of washed sand with the particle size of 0 to 5 mm, 230 to 240 parts of river sand, 230 to 240 parts of mineral powder, 20 to 25 parts of silicon powder and 6 to 12 parts of a water reducing agent. The problem of poor impermeability, corrosion resistance and sulfur resistance of conventional concrete can be solved, so that the quality of the concrete is improved, and the service life of the concrete is remarkably prolonged.

Description

Technical Field

[0001] The present application belongs to the technical field of concrete, and in particular relates to a concrete that is corrosion-resistant, seepage-resistant and sulfur-resistant. Background Art

[0002] Conventional concrete is a building material made by mixing cement, gravel, sand and water in a certain proportion. However, in a water seepage environment, especially during the solidification of concrete, the microparticles inside it are easily lost due to slurry washing, resulting in a large number of tiny pores in the solidified structure. These pores not only increase the brittleness of concrete, but also reduce its waterproof performance. In an environment where it is humid or soaked in water for a long time, especially in coastal or saline-alkali areas, concrete is more susceptible to corrosion, thereby accelerating the aging process of building structures. Therefore, when constructing projects such as deep mines, cross-sea railways and bridges, ensuring that concrete has good anti-seepage, anti-corrosion and anti-sulfur properties has become a recognized technical problem in the construction industry at home and abroad. Especially in the field of ballasted railway engineering, sleepers are one of the key factors determining the quality of the line, and their performance is directly related to the stability and safety of the entire railway system. If the sleepers do not have sufficient anti-seepage, anti-corrosion and anti-sulfur capabilities, the overall quality and service life of the railway will be difficult to be effectively guaranteed under the special conditions of saline-alkali environments or coastal areas. Therefore, the development of a new material that can effectively improve the anti-seepage, anti-corrosion and anti-sulfur properties of concrete has become an important issue that needs to be solved urgently. Summary of the invention

[0003] In order to overcome the problems existing in the related art at least to a certain extent, the present application provides a corrosion-resistant, permeability-resistant and sulfur-resistant concrete.

[0004] According to an embodiment of the present application, the present application provides a corrosion-resistant, seepage-resistant and sulfur-resistant concrete, which includes the following components, in parts by weight: 210-220 parts of silicate cement, 120-130 parts of water, 770-780 parts of 15mm-25mm gravel, 450-460 parts of 8mm-12mm gravel, 430-440 parts of 0-5mm washed sand, 230-240 parts of river sand, 230-240 parts of mineral powder, 20-25 parts of silica powder and 6-12 parts of water reducer.

[0005] As options, 212 parts of Portland cement, 127 parts of water, 770 parts of 20mm crushed stone, 460 parts of 10mm crushed stone, 432 parts of 0-5mm washed sand, 235 parts of river sand, 235 parts of mineral powder, 23 parts of silica powder and 7.2 parts of water reducer.

[0006] According to the corrosion-resistant, seepage-resistant and sulfur-resistant concrete provided in the embodiments of the present application, the water reducer adopts a naphthalenesulfonic acid formaldehyde-based water reducer.

[0007] According to the corrosion-resistant, seepage-resistant and sulfur-resistant concrete provided in the embodiments of the present application, the silicon dioxide content in the silicon powder is greater than 85% and the whiteness is 92-94 degrees.

[0008] According to the corrosion-resistant, seepage-resistant and sulfur-resistant concrete provided in the embodiment of the present application, the silicate cement adopts P.O42.5 ordinary silicate cement, and its specific surface area is 346m 2 / kg.

[0009] According to the corrosion-resistant, seepage-resistant and sulfur-resistant concrete provided in the embodiments of the present application, the mineral powder adopts S95 grade mineral powder.

[0010] According to the corrosion-resistant, seepage-resistant and sulfur-resistant concrete provided in the embodiments of the present application, the concrete surface is treated with an anti-corrosion coating or a sealant.

[0011] According to the corrosion-resistant, seepage-resistant and sulfur-resistant concrete provided by the embodiments of the present application, microcapsules containing a healing agent are added to the concrete. When cracks appear in the concrete, the capsule walls of the microcapsules rupture to release the healing agent inside; the healing agent flows to the cracks and solidifies.

[0012] According to the corrosion-resistant, seepage-resistant and sulfur-resistant concrete provided by the embodiment of the present application, a pipe and an intelligent sensor are pre-installed in the concrete, the pipe is filled with a healing agent, and an intelligent valve is arranged on the pipe, and the intelligent valve is connected to the intelligent sensor; the intelligent sensor is used to detect local stress changes in the concrete, and when the detected local stress change exceeds a preset stress change threshold, the intelligent sensor controls the opening of the intelligent valve to release the healing agent in the pipe to fill the cracks and repair them.

[0013] Furthermore, the smart sensor is communicatively connected to an external smart terminal.

[0014] According to the above specific implementation methods of the present application, it can be known that at least the following beneficial effects are achieved: the use of the corrosion-resistant, seepage-resistant and sulfur-resistant concrete provided by the present application can solve the problem of poor permeability, corrosion-resistant and sulfur-resistant properties of conventional concrete, thereby improving the quality of concrete and significantly increasing the service life of concrete. By adding microcapsules containing healing agents to concrete, when cracks appear in the concrete, the capsule walls of the microcapsules are broken, releasing the healing agents inside, and filling and curing the cracks that may appear in the concrete, thereby improving the durability and reliability of the concrete structure in complex environments. By pre-installing pipes and smart sensors in the concrete, the pipes are filled with healing agents, and smart valves are provided on the pipes, and the smart valves are connected to the smart sensors, the cracks that may appear in the concrete structure can be intelligently filled according to the stress changes of the concrete, further improving the durability and reliability of the concrete structure in complex environments.

[0015] It should be understood that the above general description and the following specific embodiments are only exemplary and illustrative and do not limit the scope of the present application. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clearly understood, the spirit of the contents disclosed in the present application will be described in detail below. After understanding the embodiments of the contents of the present application, any technician in the relevant technical field can change and modify them according to the techniques taught by the contents of the present application without departing from the spirit and scope of the contents of the present application.

[0017] The exemplary embodiments and descriptions of the present application are used to explain the present application, but are not intended to limit the present application. In addition, the elements / components with the same or similar reference numerals used in the embodiments are used to represent the same or similar parts.

[0018] The terms “first”, “second”, etc. used in this document do not particularly refer to an order or sequence, nor are they used to limit this application. They are only used to distinguish elements or operations described with the same technical terms.

[0019] The directional terms used in this article, such as up, down, left, right, front or back, etc., are only reference directions. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

[0020] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0021] As used herein, "and / or" includes any or all combinations of the items described.

[0022] As used herein, “plurality” includes “two” and “more than two”; as used herein, “plurality groups” includes “two groups” and “more than two groups”.

[0023] The terms "substantially" and "approximately" used herein are used to modify any quantity or error that may vary slightly, but these slight changes or errors do not change their essence. Generally speaking, the range of slight changes or errors modified by such terms may be 20% in some embodiments, 10% in some embodiments, 5% in some embodiments, or other values. Those skilled in the art should understand that the aforementioned values ​​can be adjusted according to actual needs and are not limited thereto.

[0024] Certain terms used to describe the present application are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of the present application.

[0025] At present, the main method to improve the waterproof performance of concrete in related technologies is to improve its internal structure by adding waterproofing agents. However, due to the limitations of the existing waterproofing agent formula design, even if the waterproofing agent is added to the concrete, it is often impossible to achieve the ideal waterproofing effect. This leads to the phenomenon that many buildings built based on traditional concrete are prone to water seepage and shedding, and even brittle failure, which greatly shortens the service life of the building. In addition, the repair work of damaged structures is not only difficult to construct and complicated to operate, but also costly, which brings great challenges to maintenance. Therefore, it is urgent to develop a new material that can effectively improve the impermeability, corrosion resistance and sulfur resistance of concrete.

[0026] The present application provides a corrosion-resistant, seepage-resistant and sulfur-resistant concrete, which includes the following components in parts by weight: 210-220 parts of silicate cement, 120-130 parts of water, 770-780 parts of 15mm-25mm crushed stone, 450-460 parts of 8mm-12mm crushed stone, 430-440 parts of 0-5mm washed sand, 230-240 parts of river sand, 230-240 parts of mineral powder, 20-25 parts of silica powder and 6-12 parts of water reducer.

[0027] Among them, silicate cement is used as the main cementitious material to ensure the basic strength and durability of concrete. Silicate cement can react with water to generate hydration products to form a strong skeleton structure. In this application, the appropriate amount of cement can ensure good workability and final strength after hardening.

[0028] Water is an indispensable medium for cement hydration reaction. The appropriate water-cement ratio is not only conducive to the full hydration of cement particles, but also ensures that the concrete has suitable workability and is convenient for construction operations. At the same time, reasonable water control helps to reduce the internal porosity of concrete, enhance density, and thus improve impermeability.

[0029] The combination of crushed stones of different particle sizes can optimize aggregate gradation and improve the density and stability of concrete. Large-sized (15mm-25mm) crushed stones can provide good skeleton support; while smaller-sized (8mm-12mm) crushed stones are filled between larger particles, which can further enhance the overall compactness of the mixture and help improve the mechanical properties and impermeability of concrete.

[0030] 0-5mm washed sand and river sand are used as fine aggregates to fill the gaps between coarse aggregates and make concrete more compact. Washed sand is clean and free of impurities, which can effectively reduce the impact of harmful substances on the long-term performance of concrete; river sand, due to its natural roundness, helps improve the fluidity of concrete and makes the pouring process smoother.

[0031] Both mineral powder and silica fume are active mineral admixtures that can participate in chemical reactions during cement hydration to generate additional hydration products, such as CSH gel, which can not only increase the later strength of concrete, but also improve its durability, especially its ability to resist sulfate erosion. Among them, silica fume is particularly critical for improving the density of concrete microstructure due to its extremely high activity.

[0032] As a surfactant, water reducer can significantly reduce the amount of water without changing the workability of concrete, or significantly improve the fluidity of concrete while maintaining the same amount of water. The advantage of doing so is that on the one hand, it can reduce the problem of increased pores caused by excessive water addition, and on the other hand, it can promote a tighter combination between cement particles, thereby achieving a better anti-seepage effect.

[0033] The corrosion-resistant, seepage-resistant and sulfur-resistant concrete provided in the present application can achieve a significant improvement in the concrete microstructure by optimizing aggregate grading, adding active mineral admixtures and utilizing high-efficiency water reducing agents, thereby enhancing the overall durability and physical and mechanical properties.

[0034] In a specific embodiment, the anti-corrosion, anti-seepage and anti-sulfur concrete provided in the embodiment of the present application contains 212 parts of silicate cement, 127 parts of water, 770 parts of 20mm crushed stone, 460 parts of 10mm crushed stone, 432 parts of 0-5mm washed sand, 235 parts of river sand, 235 parts of mineral powder, 23 parts of silica powder and 7.2 parts of water reducer. Under this ratio, the concrete can achieve C60 strength while having high anti-corrosion, anti-seepage and anti-sulfur properties, which can significantly improve the service life of the concrete.

[0035] Portland cement reacts with water to form cement paste, which is the basis of concrete strength and durability. A higher cement content helps to increase the speed of early strength development of concrete. Water is used to activate the chemical components in cement, causing it to hydrate and harden. The right amount of water is essential to ensure good fluidity and sufficient hydration. Excessive water will reduce the strength of concrete. The use of 20mm crushed stone and 10mm crushed stone can increase the volume of concrete while reducing the proportion of cement paste, which helps to control costs and reduce shrinkage cracks. The mixed use of 20mm crushed stone and 10mm crushed stone can optimize the particle grading, improve density and enhance compressive strength. 0-5mm washed sand and river sand can be filled in the gaps between 20mm crushed stone and 10mm crushed stone to improve the workability, density and surface quality of concrete. Washed sand has fewer impurities and is more conducive to improving the overall performance of concrete. Silica fume is an ultra-fine powder with an extremely high specific surface area, which can greatly promote the microstructure refinement of cement-based materials and further improve the impermeability, wear resistance and corrosion resistance of concrete. Water reducers improve the workability of concrete by reducing the amount of water required without sacrificing flow properties, while also helping to improve concrete’s strength and durability.

[0036] In a specific embodiment, the water reducer adopts a naphthalenesulfonic acid formaldehyde-based water reducer. The water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of the concrete basically unchanged. After being added to the concrete mixture, it has a dispersing effect on cement particles, can improve its workability, reduce unit water consumption, and improve the fluidity of the concrete mixture. Naphthalene-based water reducers have significant early strength and synergistic effects on concrete, can comprehensively improve and enhance the physical and mechanical properties of concrete, and can save cement while maintaining the same strength. In addition, the water reducer can reduce the amount of water while maintaining the fluidity of the concrete mixture unchanged, and can usually reduce the amount of water by 10% to 20%. This helps to reduce the water-cement ratio without sacrificing workability, thereby improving the strength of the concrete. Even when the water consumption and water-cement ratio remain unchanged, the water reducer can also improve the fluidity of the concrete mixture, which makes the concrete easier to cast and compact. By reducing the amount of water or reducing the water-cement ratio, the water reducer can improve the strength of the concrete, especially the early strength, while maintaining the fluidity of the concrete and the amount of cement. Since the water consumption is reduced, the amount of cement used can be reduced accordingly without affecting the final performance of the concrete, generally saving 5% to 20% of cement.

[0037] In a specific embodiment, the silicon dioxide content in the silicon powder is greater than 85% and the whiteness is 92-94 degrees. Silica powder is a non-toxic, odorless, non-polluting, hydrophobic (lipophilic) high-purity white micropowder with good temperature resistance, acid and alkali corrosion resistance, poor thermal conductivity, high insulation, low swelling, stable chemical properties, high hardness and other excellent properties: Silica powder is not easy to react with other substances, and does not react chemically with most acids and alkalis. Its particles are evenly covered on the surface of the object and have strong corrosion resistance; silicon micropowder treated with silane coupling agent has good wettability for various resins, good adsorption performance, easy mixing, and no agglomeration phenomenon; silica powder can fill the pores between cement particles and form a gel with hydration products; significantly improve the compression, flexural, seepage, corrosion resistance, impact resistance and wear resistance of concrete; have water retention, prevent segregation and water seepage; significantly extend the service life of concrete; in concrete, it can reduce costs, improve durability, and effectively prevent concrete alkali aggregate reaction. Active silica powder uses a unique process to modify the surface of silica micropowder particles using materials such as silane, thereby enhancing the hydrophobicity of the silica micropowder and improving the anti-seepage performance of concrete.

[0038] In a specific embodiment, the silicate cement is P.O42.5 ordinary silicate cement, which has a compressive strength of not less than 42.5 MPa within a specified age (usually 28 days) and a specific surface area of ​​346 m 2 / kg. The strength meets the design requirements, and the grade is not high, which is conducive to cost control.

[0039] In a specific embodiment, the mineral powder uses S95 grade mineral powder, which has good chemical activity. After mixing with water, it produces a secondary hydration reaction, which can reduce the pores and connecting holes of the concrete, improve the density of the concrete, and further improve the impermeability of the concrete.

[0040] The mutual cooperation of silica powder and mineral powder in the corrosion-resistant, seepage-resistant and sulfur-resistant concrete provided by the present application can fill the pores between cement particles, and at the same time generate a gel with the hydration product, significantly improving the compression, flexural, seepage-resistant, anti-corrosion, sulfur-resistant, impact-resistant and wear-resistant properties of the concrete, and prolonging the life of the concrete. The hydrophobicity of the active silica powder can effectively block the infiltration of water, thereby improving the anti-seepage and anti-cracking properties of the concrete; at the same time, through the mutual cooperation of the above-mentioned various materials, the strength and toughness of the concrete can be improved, thereby improving the mechanical strength of the concrete, and prolonging the life of the concrete.

[0041] In other embodiments, the concrete surface is treated with an anti-corrosion coating or a sealant to effectively prevent moisture and other harmful substances from invading the concrete. The anti-corrosion coating can be formed of a protective layer made of materials such as epoxy resin or polyurethane to avoid chemical erosion of the concrete.

[0042] In other embodiments, in order to improve the corrosion resistance, impermeability and sulfur resistance of concrete, microcapsules containing healing agents can also be added to the concrete, wherein the healing agent can be epoxy resin or other polymers. When cracks appear in the concrete, tensile force or shear force is applied to the microcapsules during the crack expansion process. If the position of the microcapsule is exactly on the crack path, this force is sufficient to rupture the capsule wall, thereby releasing the healing agent inside. The healing agent flows to the crack and solidifies, thereby sealing the crack. By adjusting the size distribution of the microcapsules, their uniform dispersion and coverage in the concrete matrix can be increased, further improving the overall self-healing effect of the concrete.

[0043] In other embodiments, a small pipe and a smart sensor may be pre-installed in the concrete, the pipe is filled with a healing agent, a smart valve is provided on the pipe, and the smart valve is connected to the smart sensor. The smart sensor is used to detect local stress changes in the concrete, and when the detected local stress change exceeds a preset stress change threshold, the smart sensor controls the opening of the smart valve to release the healing agent in the pipe to fill the cracks and repair them.

[0044] The smart sensor can also communicate with an external smart terminal. The smart sensor sends the detected local stress changes in the concrete to the smart terminal. The staff determines whether to remotely control the opening and closing of the smart valve based on the local stress changes received by the smart terminal.

[0045] The above description is only an illustrative specific implementation manner of the present application. Without departing from the concept and principle of the present application, any equivalent changes and modifications made by any technician in the field should fall within the scope of protection of the present application.

Claims

1. A corrosion-resistant, permeability-resistant and sulfur-resistant concrete, characterized in that: The composition is expressed in parts by weight: 210-220 parts of Portland cement, 120-130 parts of water, 770-780 parts of 15mm-25mm gravel, 450-460 parts of 8mm-12mm gravel, 430-440 parts of 0-5mm washed sand, 230-240 parts of river sand, 230-240 parts of mineral powder, 20-25 parts of silica powder and 6-12 parts of water reducing agent.

2. The corrosion-resistant, seepage-resistant and sulfur-resistant concrete according to claim 1, characterized in that: 212 parts of Portland cement, 127 parts of water, 770 parts of 20mm crushed stone, 460 parts of 10mm crushed stone, 432 parts of 0-5mm washed sand, 235 parts of river sand, 235 parts of mineral powder, 23 parts of silica powder and 7.2 parts of water reducer.

3. The corrosion-resistant, seepage-resistant and sulfur-resistant concrete according to claim 1, characterized in that: The water reducing agent is naphthalenesulfonic acid formaldehyde based water reducing agent.

4. The corrosion-resistant, seepage-resistant and sulfur-resistant concrete according to claim 1, characterized in that: The silicon dioxide content in the silicon powder is greater than 85% and the whiteness is 92-94 degrees.

5. The corrosion-resistant, seepage-resistant and sulfur-resistant concrete according to claim 1, characterized in that: The silicate cement is P.O42.5 ordinary silicate cement, and its specific surface area is 346m 2 / kg.

6. The corrosion-resistant, seepage-resistant and sulfur-resistant concrete according to claim 1, characterized in that: The mineral powder is S95 grade mineral powder.

7. The corrosion-resistant, seepage-resistant and sulfur-resistant concrete according to claim 1, characterized in that: Treat concrete surfaces with anti-corrosion coatings or sealants.

8. The corrosion-resistant, seepage-resistant and sulfur-resistant concrete according to claim 1, characterized in that: Microcapsules containing a healing agent are added to the concrete. When cracks occur in the concrete, the capsule walls of the microcapsules are broken to release the healing agent inside; the healing agent flows to the cracks and solidifies.

9. The corrosion-resistant, seepage-resistant and sulfur-resistant concrete according to claim 1, characterized in that: A pipeline and an intelligent sensor are pre-installed in the concrete. The pipeline is filled with a healing agent. An intelligent valve is arranged on the pipeline, and the intelligent valve is connected to the intelligent sensor. The intelligent sensor is used to detect local stress changes in the concrete. When the detected local stress changes exceed a preset stress change threshold, the intelligent sensor controls the opening of the intelligent valve to release the healing agent in the pipeline to fill the cracks and repair them.

10. The corrosion-resistant, seepage-resistant and sulfur-resistant concrete according to claim 9, characterized in that: The smart sensor is communicatively connected with an external smart terminal.