Preparation method of high-strength pervious concrete

Abstract

The invention discloses a preparation method of high-strength pervious concrete. The method comprises the following steps: S1, preparing materials; s2, stirring; s3, pouring is conducted; s4, vibrating and tamping; s5, rolling is conducted; and S6, trowelling and curing are conducted, specifically, trowelling treatment is conducted on the surface of the rolled concrete, and then a plastic film or color strip cloth is used for covering the road surface and the side face for moisturizing curing. The compressive strength and the wear resistance of the concrete are remarkably improved, so that the concrete can still keep stable structural performance and long service life under the condition of bearing high traffic load or severe environment, and the maintenance and replacement cost is reduced. The high strength is maintained, meanwhile, the water permeability of the water-permeable concrete is not sacrificed, a pore structure is formed in the concrete through the anti-crack polypropylene material, and it is ensured that water can rapidly and smoothly permeate into the ground.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and specifically to a method for preparing high-strength permeable concrete, which aims to provide a concrete material with excellent permeability and high strength, and is suitable for places requiring good permeability, such as urban roads, sidewalks, squares, and parking lots. Background Art

[0002] In the process of rapid urbanization, the urban surface is covered with a large amount of impermeable materials such as traditional concrete and asphalt, which not only exacerbates the urban heat island effect, but also seriously affects the urban water cycle and natural drainage system. Traditional concrete occupies a dominant position in construction projects due to its high strength, durability and ease of construction, but its high density makes it impossible for water to penetrate, which in turn causes a series of urban environmental problems, such as ground waterlogging, drainage system overload, and groundwater level drop. With the increasing attention paid to environmental protection and sustainable development, the development of permeable concrete materials has become a research hotspot in the field of building materials.

[0003] As a new type of environmentally friendly building material, permeable concrete has attracted widespread attention since its introduction due to its unique permeability. Through special mix design and preparation process, permeable concrete allows water to quickly penetrate into the ground through its internal pore structure while ensuring a certain strength, effectively alleviating urban drainage pressure and improving the urban ecological environment. However, despite the significant progress made in permeable concrete in terms of permeability, it still faces many challenges in practical application.

[0004] First, the strength of permeable concrete has always been a key factor restricting its widespread application. Since there are a large number of interconnected pores inside permeable concrete, these pores improve the permeability while also weakening the mechanical properties of concrete, resulting in the strength of permeable concrete being generally lower than that of traditional concrete. Especially in areas with high traffic loads, such as urban roads and parking lots, the insufficient strength of permeable concrete often makes it difficult to meet the use requirements, and there is a risk of cracking and damage.

[0005] Secondly, the durability of permeable concrete cannot be ignored. Although the porous structure of permeable concrete is conducive to water penetration, it also provides an intrusion path for external corrosive media such as salt and pollutants, accelerating the deterioration of concrete. In addition, the internal pore structure of permeable concrete is easily damaged under harsh environmental conditions such as freeze-thaw cycles and alternating dry and wet conditions, further reducing the durability of concrete.

[0006] Furthermore, the preparation process of permeable concrete is relatively complicated, and has strict requirements on the selection of raw materials, mix design, mixing process, and molding methods. The preparation of traditional permeable concrete mostly adopts the design concept of sandless macroporous concrete, which improves the permeability by increasing the aggregate particle size and reducing the amount of fine aggregate. However, this method often leads to insufficient concrete strength, and it is difficult to control the uniformity and connectivity of the pore structure. Therefore, how to improve the strength and durability of permeable concrete while maintaining permeability has become a technical problem that needs to be solved urgently in the current field of building materials. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a method for preparing high-strength permeable concrete, which is achieved through the following technical solutions.

[0008] A method for preparing high-strength permeable concrete, the method comprising the following steps:

[0009] S1, material preparation, the raw materials for preparing high-strength permeable concrete include cement, crack-resistant polypropylene material, quartz sand aggregate, crack-resistant reinforcing agent, additives and water. All raw materials need to be screened, washed and dried;

[0010] S2, stirring, adding the prepared raw materials into a mixer and stirring to prepare concrete slurry;

[0011] S3, pouring, spreading the concrete slurry on the foundation and performing preliminary leveling;

[0012] S4, vibrating, vibrating the spread concrete slurry to discharge bubbles in the concrete slurry;

[0013] S5, roller compaction, using a solid steel pipe or a light roller to roller compact the vibrated concrete slurry;

[0014] S6, leveling and curing, leveling the concrete surface after roller compaction, and then covering the road surface and sides with plastic film or colored strips for moisturizing and curing.

[0015] Preferably, in step S1, the weight ratio of the raw materials is: 10-15% cement, 0.1-0.5% anti-cracking polypropylene material, 30-50% quartz sand aggregate, 1-3% anti-cracking reinforcing agent, 1-3% additives and water.

[0016] Preferably, in step S1, the additives include a colloid enhancer, a chemical reaction stabilizer and a coloring dye.

[0017] Preferably, in step S2, the step of adding raw materials is:

[0018] S21, water;

[0019] S22, quartz sand aggregate;

[0020] S23, cement, crack-resistant polypropylene material and crack-resistant reinforcing agent;

[0021] S24, additive.

[0022] Preferably, water and quartz sand aggregate are first added and stirred for 30 seconds; then cement, anti-cracking polypropylene material and anti-cracking reinforcing agent are added and stirred for 40 seconds; finally additives are added and stirred for 50 seconds; the stirring speed is 10-12 revolutions per minute.

[0023] Preferably, in step S3, before pouring, an interface agent needs to be sprayed on the foundation.

[0024] Preferably, in step S4, a flat plate vibrator is used to vibrate the spread concrete slurry, and during the vibration process, a vibrating rod is used to supplement the edges and corners and parts that are difficult to vibrate to ensure that there are no bubbles and voids in the concrete.

[0025] Preferably, in step S6, watering is required to be performed regularly to keep the concrete surface moist, and the watering curing time is not less than 7 days.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1. Significantly improve strength and durability. By adding anti-cracking polypropylene materials and anti-cracking enhancers, the compressive strength and wear resistance of concrete are significantly improved, so that the concrete can still maintain stable structural performance and long service life under high traffic loads or harsh environmental conditions, reducing maintenance and replacement costs.

[0028] 2. Excellent water permeability: While maintaining high strength, the present invention does not sacrifice the water permeability of permeable concrete. The anti-cracking polypropylene material forms a pore structure inside the concrete to ensure that water can penetrate quickly and smoothly into the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the specific implementation methods will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 : Flow chart of a method for preparing high-strength permeable concrete according to the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1 As shown, a method for preparing high-strength permeable concrete comprises the following steps:

[0033] S1. Material preparation. The raw materials for the preparation of high-strength permeable concrete include cement, anti-cracking polypropylene material, quartz sand aggregate, anti-cracking enhancer, additives and water. All raw materials must be screened, washed and dried to ensure that they are free of impurities and have an appropriate moisture content.

[0034] Cement is the bonding material, anti-cracking polypropylene fiber can enhance the anti-cracking performance of concrete, quartz sand aggregate can improve the strength and wear resistance of concrete, and anti-cracking enhancers and additives can improve the overall performance and appearance of concrete.

[0035] The weight ratio of various raw materials is: 10-15% cement, 0.1-0.5% anti-cracking polypropylene material, 30-50% quartz sand aggregate, 1-3% anti-cracking reinforcing agent, 1-3% additives and water.

[0036] Specifically, the various raw materials include 12.5% ​​cement, 0.3% anti-cracking polypropylene material, 45% quartz sand aggregate, 2% anti-cracking reinforcing agent, 2% additives and 38.2% water by weight.

[0037] Additives include colloidal enhancers, chemical reaction stabilizers and coloring dyes.

[0038] S2, stirring, adding the prepared raw materials into a mixer and stirring to prepare concrete slurry.

[0039] The stirring speed is 10-12 revolutions per minute.

[0040] The steps of adding raw materials are:

[0041] S21, water, is added into the blender to wet the blender and reduce the adhesion of subsequent raw materials.

[0042] S22, quartz sand aggregate, quartz sand aggregate constitutes the main skeleton of high-strength permeable concrete. After the quartz sand aggregate is added, stir for 30S.

[0043] S23, cement, anti-cracking polypropylene material and anti-cracking reinforcing agent, these raw materials will contact with the surface of quartz sand aggregate and produce cementation during the mixing process, and the mixing time is controlled to be 40S.

[0044] S24, additives, such as colloid enhancer, chemical reaction stabilizer and coloring dye, are added to adjust the performance of the concrete. During the mixing process, an appropriate amount of water can also be added to adjust the consistency of the concrete. The mixing time is controlled to be 50S.

[0045] During the mixing process, adding materials in stages can ensure that all raw materials are fully mixed.

[0046] S3, pouring, spreading the concrete slurry on the foundation and performing preliminary leveling.

[0047] Before pouring, it is necessary to spray the interface agent on the foundation to improve the bonding strength and waterproof performance between the concrete and the base layer.

[0048] S4, vibrating, vibrating the spread concrete slurry to expel the bubbles in the concrete slurry.

[0049] Use a flat vibrator to vibrate the spread concrete slurry. During the vibration process, use a vibrating rod to perform additional vibration on the corners and areas that are difficult to vibrate to ensure that there are no bubbles or voids inside the concrete.

[0050] Avoid high-frequency vibration to prevent the concrete from being too dense, and control the vibration time and force to ensure that there are no bubbles inside the concrete and the surface is flat.

[0051] S5, roller compaction, uses a solid steel pipe or a light roller to roller compact the vibrated concrete slurry.

[0052] In the early stage of roller compaction, a slower speed and a higher frequency can be used to better discharge bubbles and excess moisture in the concrete; as the concrete gradually hardens, the speed can be appropriately increased and the frequency can be reduced.

[0053] S6, leveling and curing, leveling the concrete surface after roller compaction, and then covering the road surface and sides with plastic film or colored strips for moisturizing and curing.

[0054] In step S6, watering is required to be performed regularly to keep the concrete surface moist, and the watering curing time is not less than 7 days.

[0055] The frequency of watering during concrete curing is divided into time stages.

[0056] Initial maintenance (0-3 days): This stage is an important period for concrete maintenance. The hydration reaction is relatively rapid, and concrete needs a large amount of water for hydration. Water it every 2-4 hours to ensure that the concrete surface always remains moist.

[0057] Mid-term curing (4-6 days): After entering the mid-term curing stage, the hydration reaction rate of concrete slows down, and watering is done 3-4 times a day, and the interval time can be extended to 4-6 hours.

[0058] In the later stage of maintenance (more than 6 days), the hydration reaction of the concrete has become relatively stable, and watering is done 1-2 times a day.

[0059] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing high-strength permeable concrete, characterized in that: The method comprises the following steps: S1, material preparation, the raw materials for preparing high-strength permeable concrete include cement, crack-resistant polypropylene material, quartz sand aggregate, crack-resistant reinforcing agent, additives and water. All raw materials need to be screened, washed and dried; S2, stirring, adding the prepared raw materials into a mixer and stirring to prepare concrete slurry; S3, pouring, spreading the concrete slurry on the foundation and performing preliminary leveling; S4, vibrating, vibrating the spread concrete slurry to discharge bubbles in the concrete slurry; S5, roller compaction, using a solid steel pipe or a light roller to roller compact the vibrated concrete slurry; S6, leveling and curing, leveling the concrete surface after roller compaction, and then covering the road surface and sides with plastic film or colored strips for moisturizing and curing.

2. A method for preparing high-strength permeable concrete according to claim 1, characterized in that: In step S1, the raw materials are composed of 10-15% cement, 0.1-0.5% anti-cracking polypropylene material, 30-50% quartz sand aggregate, 1-3% anti-cracking reinforcing agent, 1-3% additives and water in weight ratio.

3. The method for preparing high-strength permeable concrete according to claim 1, characterized in that: In the step S1, the additives include a colloid enhancer, a chemical reaction stabilizer and a coloring dye.

4. The method for preparing high-strength permeable concrete according to claim 1, characterized in that: In step S2, the step of adding raw materials is: S21, water; S22, quartz sand aggregate; S23, cement, crack-resistant polypropylene material and crack-resistant reinforcing agent; S24, additive.

5. A method for preparing high-strength permeable concrete according to claim 4, characterized in that: First, add water and quartz sand aggregate and stir for 30 seconds; then add cement, anti-cracking polypropylene material and anti-cracking reinforcing agent and stir for 40 seconds; finally add additives and stir for 50 seconds; the stirring speed is 10-12 revolutions per minute.

6. The method for preparing high-strength permeable concrete according to claim 1, characterized in that: In the step S3, before pouring, an interface agent needs to be sprayed on the foundation.

7. The method for preparing high-strength permeable concrete according to claim 1, characterized in that: In step S4, a flat plate vibrator is used to vibrate the spread concrete slurry, and a vibrating rod is used to supplement the edges and corners and parts that are difficult to vibrate during the vibration process to ensure that there are no bubbles and voids in the concrete.

8. The method for preparing high-strength permeable concrete according to claim 1, characterized in that: In step S6, watering is required to be performed regularly to keep the concrete surface moist, and the watering curing time is not less than 7 days.

Images