Impermeable commercial concrete and preparation method thereof

Abstract

The invention provides anti-seepage commercial concrete and a preparation method thereof, and relates to the technical field of building materials, and the anti-seepage performance of the anti-seepage commercial concrete is remarkably improved through a scientific proportion and a unique preparation method. The permeability coefficient is greatly reduced, water permeation can be effectively prevented, and the problems of structural damage, steel bar corrosion and the like caused by water invasion of a building are avoided. Therefore, the service life of the building is prolonged, and the later maintenance and reinforcement cost is reduced. For example, in underground waterproof engineering, by using the concrete, the risk of basement leakage can be remarkably reduced, dryness and safety of underground space are guaranteed, a comfortable environment is provided for a user, the compressive strength of the concrete in 7 days and 28 days is remarkably improved through the optimized raw material combination and the preparation process, and the concrete has good waterproof performance. A large amount of fly ash, mineral powder and other industrial waste residues are used for replacing part of cement, comprehensive utilization of resources is achieved, and energy consumption and environmental pollution in the cement production process are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and more specifically, particularly relates to an anti-seepage commercial concrete and a preparation method thereof. Background Art

[0002] In the field of modern construction engineering, concrete is a widely used building material, and its performance is directly related to the quality, durability and safety of buildings. With the increasing complexity and diversification of construction projects, the requirements for the anti-seepage performance of concrete are becoming higher and higher. Especially in the fields of water conservancy projects, underground projects, sewage treatment facilities, etc., the anti-seepage ability of concrete is crucial. If the anti-seepage performance of concrete is poor, it may lead to water penetration, causing problems such as steel corrosion and concrete structure deterioration, seriously affecting the service life and safety of the building.

[0003] Traditional commercial concrete often has certain limitations in terms of anti-seepage. On the one hand, the selection and proportion of its raw materials are not scientific and reasonable, resulting in more pores in the concrete and a less dense structure, which makes it easy for water to penetrate through the pores. On the other hand, the traditional preparation method is not precise enough in the control of mixing and molding, which affects the uniformity and density of the concrete, thereby reducing its anti-seepage performance.

[0004] In terms of raw materials, traditional concrete uses a large amount of cement, and the production process of cement not only consumes a lot of energy and resources, but also emits a large amount of greenhouse gases such as carbon dioxide, which puts great pressure on the environment. At the same time, the utilization rate of industrial waste residues such as fly ash and mineral powder is relatively low, resulting in waste of resources and environmental pollution. In addition, the quality of the aggregates used is uneven, and the mud content is too high, which will also affect the performance of concrete.

[0005] In terms of preparation technology, traditional methods usually do not strictly control parameters such as mixing time, speed, temperature, and humidity, resulting in the failure to fully mix the various components of concrete, affecting the microstructure and performance of the concrete. Moreover, when adding admixtures, there is often a lack of scientific methods and precise control, which makes it impossible to fully play the role of admixtures and effectively improve the anti-seepage performance of concrete.

[0006] In order to solve these problems, researchers have been working hard to explore new technologies and methods. In recent years, with the continuous development of materials science and the continuous advancement of construction technology, some new anti-seepage materials and admixtures have gradually been applied to concrete, such as high-performance waterproofing agents and expansion agents. These materials have improved the anti-seepage performance of concrete to a certain extent, but there are still some shortcomings in practical applications. For example, the durability of some waterproofing agents is not ideal, and the anti-seepage effect will gradually decrease after long-term use; the amount and conditions of the expansion agent are difficult to accurately grasp, and improper use may have an adverse effect on the performance of concrete.

[0007] In addition, the existing methods for preparing anti-seepage concrete still need to be further improved in terms of process parameter optimization and control. Although some methods can achieve good anti-seepage effects under laboratory conditions, their performance stability is difficult to guarantee in large-scale production and actual construction due to factors such as fluctuations in raw material quality and changes in the construction environment.

[0008] Therefore, developing an anti-seepage commercial concrete with reasonable raw material selection, scientific proportion, advanced preparation process and stable performance and its preparation method has become an important problem to be solved in the construction industry. This new type of anti-seepage concrete should not only have excellent anti-seepage performance, can meet the needs of various complex projects, but also have good mechanical properties, construction performance and economic performance to meet the development requirements of modern construction projects. At the same time, its preparation method should have strong operability and repeatability, which is convenient for promotion and application in actual production and construction. The present invention arises at the historic moment under such a background, and aims to provide an effective solution to solve the anti-seepage problem in construction projects. Summary of the invention

[0009] In order to solve the above technical problems, the present invention provides an anti-seepage commercial concrete and a preparation method thereof to solve the above problems.

[0010] An anti-seepage commercial concrete is made of the following raw materials in parts by weight: 280-320 parts of cement, 90-110 parts of fly ash, 90-110 parts of mineral powder, 750-850 parts of fine aggregate, 1050-1150 parts of coarse aggregate, 170-190 parts of water, 7-9 parts of water reducer, 12-18 parts of expansion agent, and 6-9 parts of waterproofing agent, wherein the fine aggregate is medium sand with a fineness modulus of 2.5-2.7 and a mud content of no more than 1.5%, the coarse aggregate is crushed stone with a particle size of 5-25 mm and a mud content of no more than 0.8%, and the permeability coefficient K of the concrete satisfies the following relationship with the amount of expansion agent E and the amount of waterproofing agent F: K=0.01E-0.005F+0.002, in units of cm / s.

[0011] Preferably, the cement is silicate cement with a strength grade of 42.5, and its 28-day compressive strength is not less than 42.5 MPa.

[0012] Preferably, the fly ash is first-grade fly ash with a water requirement ratio of no more than 95%, and the mineral powder is S95 grade mineral powder with a fluidity ratio of no less than 95%.

[0013] Preferably, the expansion agent is a calcium sulfoaluminate expansion agent, and its limiting expansion rate is not less than 0.025% in water for 7 days and not less than -0.02% in air for 21 days.

[0014] Preferably, the waterproofing agent is an organic silicon waterproofing agent, and its solid content is not less than 30%.

[0015] A method for preparing anti-seepage commercial concrete comprises the following steps:

[0016] S1: put fine aggregate, coarse aggregate, fly ash and mineral powder into a mixer and stir for 1.5 minutes at a speed of 25 rpm and a stirring temperature of 20-30°C;

[0017] S2: Add cement, expansion agent and waterproofing agent, stir for 2.5 minutes, the mixer speed is 35 rpm, and the stirring humidity is 40%-60%;

[0018] S3: adding water and a water reducing agent, stirring for 4 minutes, with the rotating speed of the mixer being 45 rpm, to obtain the anti-seepage commercial concrete.

[0019] Preferably, in step S1, the moisture content of the aggregate is controlled at 2%-4%.

[0020] Preferably, in step S2, the temperature of the material is controlled at 30-40°C.

[0021] Preferably, in step S3, the ambient pressure during stirring is standard atmospheric pressure ±0.02 MPa.

[0022] Preferably, the water reducer is diluted with water before being added, the dilution ratio is 1:4, and the water temperature is controlled at 15-25°C during dilution.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. Significantly improve the anti-seepage performance. The anti-seepage commercial concrete of the present invention has significantly improved its anti-seepage performance through scientific proportioning and unique preparation method. The permeability coefficient is greatly reduced, which can effectively prevent the penetration of water and avoid problems such as structural damage and steel corrosion caused by water intrusion in buildings. This not only extends the service life of the building, but also reduces the cost of later maintenance and reinforcement. For example, in underground waterproofing projects, the use of the concrete of the present invention can significantly reduce the risk of basement leakage, ensure the dryness and safety of the underground space, and provide a comfortable environment for users.

[0025] 2. Enhanced compressive strength. The optimized raw material combination and preparation process significantly improve the compressive strength of concrete at 7 days and 28 days. This means that the building can have a higher load-bearing capacity at an early stage, speeding up the construction progress. At the same time, it can withstand greater loads in long-term use, enhancing the stability and safety of the structure. In important projects such as high-rise buildings and large bridges, high-strength concrete can ensure the reliability of the structure, reduce safety hazards caused by insufficient strength, and protect people's lives and property.

[0026] 3. Comprehensive resource utilization and environmental protection. A large amount of industrial waste residues such as fly ash and mineral powder are used to replace part of the cement, which realizes the comprehensive utilization of resources and reduces energy consumption and environmental pollution in the cement production process. At the same time, it reduces waste emissions, meets the requirements of sustainable development, and contributes to the green transformation of the construction industry. This environmental protection feature not only helps to reduce ecological pressure, but also enhances the social image of the enterprise and promotes the harmonious coexistence of the construction industry and the environment.

[0027] 4. Optimize construction performance. The concrete of the present invention has good working performance, such as fluidity and workability, and is convenient for construction operation. During the pouring process, the formwork can be evenly filled, the difficulty of vibration can be reduced, the construction efficiency can be improved, and the construction quality can be guaranteed. For the construction of complex structures and narrow spaces, good construction performance is particularly important, which can avoid quality defects such as voids and honeycombs, and ensure the integrity and density of the concrete structure.

[0028] 5. Balance of cost-effectiveness. Although the cost of raw materials for some mixes may be slightly higher than that of traditional concrete, the overall cost-effectiveness has reached a good balance by comprehensively considering its excellent performance and reduced later maintenance costs. High strength and high anti-seepage performance reduce the additional costs caused by repairs and reconstruction, and have a higher cost-effectiveness in the long run. This is of great significance for cost control and economic benefit improvement of engineering projects, enabling construction units to optimize investment while ensuring quality.

[0029] 6. Adapting to various engineering needs, by adjusting the mix ratio, the specific requirements of different projects for concrete performance can be met. Whether it is a water conservancy project, an underground project or a construction project under a special environment, a suitable concrete formula can be customized according to the specific situation, expanding its application range. This flexibility makes the concrete of the present invention widely applicable in various engineering fields, providing an effective solution to solve a variety of engineering problems.

[0030] 7. Promote technological progress in the industry. This invention provides new technical ideas and methods for the field of anti-seepage concrete, motivating peers to increase R&D investment and promote technological innovation and product upgrades. Relevant research results and practical experience will help improve industry standards and specifications, and lead the industry to develop in a direction of higher quality, more environmentally friendly, and more efficient. This will play an important role in promoting the technical level and competitiveness of the entire building materials industry.

[0031] 8. Guarantee the quality and durability of the project. The combination of excellent anti-seepage performance and compressive strength greatly improves the quality and durability of the project. The building can better resist the erosion and damage of the external environment and reduce the structural failure caused by the deterioration of concrete. In harsh environments or long-term use conditions, it can still maintain good performance, extend the service life of the building, and create more lasting value for society.

[0032] 9. Improve building safety. High-quality anti-seepage performance and high strength can effectively enhance the building's ability to resist natural disasters such as earthquakes and floods, and reduce the risk of secondary disasters caused by structural damage. At the same time, it can reduce safety accidents such as electrical equipment failures and slips caused by leakage, providing people with a safer and more reliable living and working environment.

[0033] 10. Promote sustainable development. The anti-seepage commercial concrete of the present invention reduces the consumption of natural resources, energy consumption and greenhouse gas emissions during production and use. It provides strong technical support for building a resource-saving and environmentally friendly society and promotes the construction industry to move towards a green, low-carbon and environmentally friendly direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of concrete and its preparation method in the present invention. DETAILED DESCRIPTION

[0035] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] The present invention relates to an anti-seepage commercial concrete and a preparation method thereof, aiming to provide a concrete material with excellent anti-seepage performance to meet application scenarios with high requirements for waterproofing in construction projects.

[0037] The silicate cement with strength grade of 42.5 is selected, and its 28-day compressive strength is 48.5MPa, which ensures the stable quality of cement without caking and moisture. The first-grade fly ash is selected, with a water demand ratio of 92%, uniform color and no obvious impurities. The S95 grade mineral powder is selected, with a fluidity ratio of 98% and an appearance of grayish white powder. The medium sand with a fineness modulus of 2.6, a mud content of 1.2% and good particle grading is selected. The crushed stone with a particle size of 5-25mm, a mud content of 0.6% and a crushing index of 8% is used. The tap water that meets the national standards is used, and its pH value is between 6.5-8.5. The high-performance polycarboxylate water reducer is selected with a water reduction rate of 28%. The calcium sulfoaluminate expansion agent is used to limit the expansion rate to 0.03% in water for 7 days and -0.01% in air for 21 days. The silicone waterproofing agent is selected with a solid content of 35%.

[0038] The design basis ratio is as follows (unit: kg / m3):

[0039]

[0040] In order to study the effect of different raw material amounts on concrete performance, the following adjusted mix ratios were designed:

[0041]

[0042] When preparing the concrete, a forced mixer model HZS180 is used, with an effective volume of 3m

[0043] , put fine aggregate, coarse aggregate, fly ash and mineral powder into the mixer, stir for 1.5 minutes, the speed of the mixer is 25 rpm, the stirring temperature is controlled at 25°C, the moisture content of the aggregate is controlled at 3%, cement, expansion agent and waterproofing agent are added, stirred for 2.5 minutes, the speed of the mixer is 35 rpm, the stirring humidity is 50%, the temperature of the material is controlled at 35°C, water and water reducing agent are added, stirred for 4 minutes, the speed of the mixer is 45 rpm, and anti-seepage commercial concrete is obtained. The ambient pressure during stirring is standard atmospheric pressure.

[0044] In order to verify the performance of the anti-seepage commercial concrete of the present invention, the following experiments were conducted, and a comparative example was set for comparison:

[0045] Contrast ratio settings:

[0046] Comparative Example 1: Using the traditional commercial concrete mix ratio without adding expansion agent and waterproofing agent;

[0047] Comparative Example 2: Reduce the amount of fly ash and mineral powder and increase the amount of cement;

[0048] Comparative Example 3: Using ordinary water reducing agent instead of high performance water reducing agent;

[0049] Comparative Example 4: Lowering the quality standards of fine aggregate and coarse aggregate.

[0050] The specimens were made in accordance with the Standard Test Methods for Long-term Performance and Durability of Ordinary Concrete (GB / T50082-2009) and the permeability coefficient was tested. The specimens were made in accordance with the Standard Test Methods for Mechanical Properties of Ordinary Concrete (GB / T50081-2019) and the compressive strength was tested for 7 days and 28 days.

[0051] Permeability coefficient experiment:

[0052]

[0053] It can be seen from the above data that the permeability coefficient of the anti-seepage commercial concrete of the present invention is significantly lower than that of the comparative example, and the anti-seepage performance is significantly improved.

[0054] Compressive strength test:

[0055]

[0056] The concrete of the present invention is also superior to the comparative example in terms of compressive strength.

[0057] Cost analysis, cost analysis of the anti-seepage commercial concrete of the present invention and the comparative example, considering factors such as raw material cost and preparation cost:

[0058]

[0059] Although the cost of some of the mix proportions of the present invention is slightly higher than that of the comparative example, it has a higher cost-effectiveness when its excellent anti-seepage performance and compressive strength are comprehensively considered.

[0060] The anti-seepage commercial concrete and its preparation method of the present invention significantly improve the anti-seepage performance and compressive strength of concrete by optimizing the raw material mix ratio and preparation process. The verification test results show that its performance is better than that of traditional concrete and has good application prospects and economic value.

[0061] Significantly improve the anti-seepage performance. The anti-seepage commercial concrete of the present invention has significantly improved its anti-seepage performance through scientific proportioning and unique preparation method. The permeability coefficient is greatly reduced, which can effectively prevent the penetration of water and avoid problems such as structural damage and steel corrosion caused by water intrusion in buildings. This not only extends the service life of the building, but also reduces the cost of later maintenance and reinforcement. For example, in underground waterproofing projects, the use of the concrete of the present invention can significantly reduce the risk of basement leakage, ensure the dryness and safety of the underground space, and provide a comfortable environment for users.

[0062] Enhanced compressive strength, optimized raw material combination and preparation process have significantly improved the compressive strength of concrete at 7 days and 28 days. This means that buildings can have a higher load-bearing capacity at an early stage, speeding up the construction progress, and can withstand greater loads in long-term use, enhancing the stability and safety of the structure. In important projects such as high-rise buildings and large bridges, high-strength concrete can ensure the reliability of the structure, reduce safety hazards caused by insufficient strength, and protect people's lives and property.

[0063] The large-scale use of industrial waste residues such as fly ash and mineral powder to replace part of the cement has achieved comprehensive utilization of resources and reduced energy consumption and environmental pollution in the cement production process. At the same time, it has reduced waste emissions, met the requirements of sustainable development, and contributed to the green transformation of the construction industry. This environmentally friendly feature not only helps to reduce ecological pressure, but also enhances the social image of the company and promotes the harmonious coexistence of the construction industry and the environment.

[0064] The concrete of the present invention has good working properties, such as fluidity and workability, and is convenient for construction operation. During the pouring process, the formwork can be evenly filled, the difficulty of vibration is reduced, the construction efficiency is improved, and the construction quality is guaranteed. For the construction of complex structures and narrow spaces, good construction performance is particularly important, which can avoid quality defects such as cavities and honeycombs, and ensure the integrity and compactness of the concrete structure.

[0065] Although the raw material cost of some mixes may be slightly higher than that of traditional concrete, the overall cost-effectiveness has reached a good balance considering its excellent performance and reduced later maintenance costs. High strength and high anti-seepage performance reduce the additional costs caused by repairs and reconstruction, and have a higher cost-effectiveness in the long run. This is of great significance for cost control and economic benefit improvement of engineering projects, enabling construction units to optimize their investment while ensuring quality.

[0066] By adjusting the mix ratio, the specific requirements of different projects for concrete performance can be met. Whether it is a water conservancy project, an underground project or a construction project under special environment, a suitable concrete formula can be customized according to the specific situation, expanding its application range. This flexibility makes the concrete of the present invention widely applicable in various engineering fields and provides an effective solution to solve various engineering problems.

[0067] The present invention provides new technical ideas and methods for the field of anti-seepage concrete, inspiring peer companies to increase R&D investment and promote technological innovation and product upgrades. Relevant research results and practical experience are helpful to improve industry standards and specifications, and lead the industry to develop in the direction of higher quality, more environmental protection and more efficiency. This has an important role in promoting the technical level and competitiveness of the entire building materials industry.

[0068] The combination of excellent anti-seepage performance and compressive strength greatly improves the quality and durability of the project. Buildings can better resist erosion and damage from the external environment and reduce structural failures caused by concrete deterioration. In harsh environments or long-term use conditions, they can still maintain good performance, extend the service life of buildings, and create more lasting value for society.

[0069] The high-quality anti-seepage performance and high strength can effectively enhance the building's ability to resist natural disasters such as earthquakes and floods, and reduce the risk of secondary disasters caused by structural damage. At the same time, it reduces safety accidents such as electrical equipment failures and slips caused by leakage, and provides people with a safer and more reliable living and working environment. The anti-seepage commercial concrete of the present invention reduces the consumption of natural resources, energy consumption and greenhouse gas emissions during production and use. It provides strong technical support for building a resource-saving and environmentally friendly society, and promotes the construction industry to move towards a green, low-carbon and environmentally friendly direction.

[0070] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. An anti-seepage commercial concrete, characterized in that: Made of the following raw materials in parts by weight: 280-320 parts of cement, 90-110 parts of fly ash, 90-110 parts of mineral powder, 750-850 parts of fine aggregate, 1050-1150 parts of coarse aggregate, 170-190 parts of water, 7-9 parts of water reducer, 12-18 parts of expansion agent, and 6-9 parts of waterproofing agent; Wherein, the fine aggregate is medium sand, the fineness modulus is 2.5-2.7, and the mud content is not more than 1.5%; The coarse aggregate is crushed stone with a particle size of 5-25 mm and a mud content of no more than 0.8%. The permeability coefficient K of the concrete satisfies the following relationship with the amount of expansion agent E and the amount of waterproofing agent F: K=0.01E-0.005F+0.002, in units of cm / s.

2. The anti-seepage commercial concrete according to claim 1, characterized in that: The cement is silicate cement with a strength grade of 42.5, and its 28-day compressive strength is not less than 42.5 MPa.

3. The anti-seepage commercial concrete according to claim 1, characterized in that: The fly ash is first-grade fly ash, and its water requirement ratio is not more than 95%. The mineral powder is S95 grade mineral powder, and its fluidity ratio is not less than 95%.

4. The anti-seepage commercial concrete according to claim 1, characterized in that: The expansion agent is a calcium sulphoaluminate expansion agent, and its limiting expansion rate is not less than 0.025% in water for 7 days and not less than -0.02% in air for 21 days.

5. The anti-seepage commercial concrete according to claim 1, characterized in that: The waterproofing agent is an organic silicon waterproofing agent, and its solid content is not less than 30%.

6. A method for preparing anti-seepage commercial concrete, characterized in that: The following steps are involved: S1: put fine aggregate, coarse aggregate, fly ash and mineral powder into a mixer and stir for 1.5 minutes at a speed of 25 rpm and a stirring temperature of 20-30°C; S2: Add cement, expansion agent and waterproofing agent, stir for 2.5 minutes, the mixer speed is 35 rpm, and the stirring humidity is 40%-60%; S3: adding water and a water reducing agent, stirring for 4 minutes, with the rotating speed of the mixer being 45 rpm, to obtain the anti-seepage commercial concrete.

7. The method for preparing anti-seepage commercial concrete according to claim 6, characterized in that: In step S1, the moisture content of the aggregate is controlled at 2%-4%.

8. The method for preparing anti-seepage commercial concrete according to claim 6, characterized in that: In step S2, the temperature of the material is controlled at 30-40°C.

9. The method for preparing anti-seepage commercial concrete according to claim 6, characterized in that: In step S3, the ambient pressure during stirring is standard atmospheric pressure ±0.02 MPa.

10. The method for preparing anti-seepage commercial concrete according to any one of claims 6 to 9, characterized in that: The water reducer is diluted with water before being added, the dilution ratio is 1:4, and the water temperature is controlled at 15-25°C during dilution.

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