Composite decorative concrete with permeable function and construction method thereof

Abstract

The invention relates to the technical field of decorative concrete, and discloses composite decorative concrete with a water permeable function, which comprises a subbase layer water permeable mortar layer with the water permeable coefficient of more than 0.5 mm / s and the thickness range of 2-3cm; the permeable coefficient of the base layer permeable concrete layer is larger than that of the subbase layer permeable mortar layer, the invention further discloses a construction method of the decorative concrete with the composite permeable function, and the construction method comprises the following steps that S1, the permeable mortar layer is poured on the subbase layer; and S2, a base layer water-permeable concrete layer is poured on the subbase layer water-permeable mortar layer. Through the multi-layer structural design with the composite permeable function, the permeable mortar layer, the permeable concrete layer and the decorative concrete layer, the problem that existing decorative concrete lacks water permeability is solved, meanwhile, the strength and durability are enhanced, and the composite permeable concrete is particularly suitable for high-strength use scenes such as carriageways and parking lots. And the permeable paving rate requirement of a sponge city is met.

Description

Technical Field

[0001] The present invention relates to the technical field of decorative concrete, and particularly to decorative concrete with a composite water permeability function and its construction method. Background Art

[0002] With the continuous advancement of the urbanization process, the construction requirements for urban infrastructure such as roads, squares, and parking lots are increasing day by day, especially the demand for urban drainage and rainwater management is becoming more urgent. To solve the problem of urban waterlogging caused by traditional concrete materials, permeable concrete has emerged as a new type of building material. Permeable concrete can effectively promote the infiltration of rainwater, reduce the pressure on the urban drainage system, and is widely used in areas such as sidewalks, parking lots, and squares. However, although permeable concrete has good water permeability, it exposes some defects in practical applications, especially problems in strength and durability.

[0003] Traditional decorative concrete is mainly used to improve the aesthetics of the concrete surface. Its surface effects usually include changes such as the original color and color, and the surface tissue structure has various forms such as texture finishes, exposed aggregate finishes, and mechanical finishes. It can even simulate the appearance of natural stone through the effect of simulated stone. These decorative concretes can not only provide beautiful visual effects but also often have certain wear resistance and weather resistance. However, the existing decorative concretes usually do not have the water permeability function and cannot effectively solve the problems of rainwater infiltration and urban drainage. Especially in use scenarios such as sidewalks, large squares, or parking lots, it is difficult to meet the requirements of the "sponge city" for the water permeability paving rate.

[0004] In addition, although traditional permeable concrete has good water permeability, its strength is usually low. Especially in high-load places such as roadways and parking lots, the corners of permeable concrete are prone to wear or breakage, with poor durability and a relatively short service life. The corner damage of the permeable concrete surface layer seriously affects its performance in high-strength application environments, so it is difficult to meet the requirements of modern urban high-strength use environments.

[0005] Current technologies attempt to improve the strength of permeable concrete by increasing the coarse aggregate or changing the particle size of the aggregate, but these technologies often lead to a decrease in water permeability and fail to ensure water permeability while enhancing strength. In addition, the water permeability of decorative concrete has not been effectively improved, and it can usually only be used as a single aesthetic functional material without being combined with the water permeability function.

[0006] Therefore, there are problems in the prior art such as decorative concrete not meeting the water permeability function requirements, low strength of permeable concrete, and poor durability. There is an urgent need for a new type of concrete material or construction method that can balance strength, water permeability, and aesthetic effects, especially in ground paving in places such as sidewalks and parking lots that require high durability and high water permeability. Summary of the Invention

[0007] Aiming at the deficiencies of the prior art, the present invention provides decorative concrete with a composite water-permeable function and its construction method, solving the problems of insufficient strength of traditional permeable concrete, easy damage to corners, and lack of water-permeable function in decorative concrete.

[0008] To achieve the above objectives, the present invention is realized through the following technical solutions: Decorative concrete with a composite water-permeable function, including: A bottom-layer permeable mortar layer with a water permeability coefficient greater than 0.5 mm / s and a thickness range of 2 - 3 cm; A base-layer permeable concrete layer with a water permeability coefficient greater than that of the bottom-layer permeable mortar layer, and strip-shaped protrusions are provided in local areas of the permeable concrete layer, and the strip-shaped protrusions are at the same elevation as the surface layer; A surface-layer decorative concrete layer, which is poured on the base-layer permeable concrete layer to form an integral structure.

[0009] Preferably, the thickness of the bottom-layer permeable mortar layer is 2 - 3 cm, and its mixing ratio is: The mass ratio of 525 cement: enhancer: extra-fine sand with a particle size of 0.075 - 0.15 mm: sand with a particle size of 0.8 - 1.4 mm: sand with a particle size of 1.4 - 2.36 mm: water: water reducer is 1600:80:840:1685:7181:436:67.

[0010] Preferably, the mixing ratio of the base-layer permeable concrete layer is: The mass ratio of 525 cement: enhancer: extra-fine sand with a particle size of 0.075 - 0.15 mm: sand with a particle size of 0.8 - 1.4 mm: sand with a particle size of 1.4 - 2.36 mm: gravel with a particle size of 5 - 10 mm: water: water reducer is 1600:80:504:1242:4967:2661:436:67.

[0011] Preferably, the mixing ratio of the decorative concrete layer is: The mass ratio of 525 cement: enhancer: extra-fine sand with a particle size of 0.075 - 0.15 mm: sand with a particle size of 1.4 - 2.36 mm: gravel with a particle size of 5 - 10 mm: water: water reducer: defoaming powder is 1624:81:852:1658:3870:443:68:1.7.

[0012] A construction method for decorative concrete with a composite water-permeable function, including the following steps: S1. Pour a permeable mortar layer on the bottom layer; S2. Pour a base-layer permeable concrete layer on the bottom-layer permeable mortar layer; S3. Pour a surface decorative concrete layer on the base permeable concrete layer. The surface of the surface decorative concrete layer is flat and forms an integral structure with the base permeable concrete layer.

[0013] Preferably, the S1 step specifically includes: S1.1. Lay a cement stabilized macadam layer or a graded macadam layer on the subbase; S1.2. Pour a prepared subbase permeable mortar layer on the cement stabilized macadam layer or the graded macadam layer according to the ratio.

[0014] Preferably, the S2 step specifically includes: S2.1. Pour a prepared base permeable concrete layer on the subbase permeable mortar layer; S2.2. Set strip-shaped protrusions in local areas of the base permeable concrete layer. The elevation of the strip-shaped protrusions is the same as that of the surface layer.

[0015] Preferably, the S3 step specifically includes: S3.1. Pour a prepared surface decorative concrete layer on the base permeable concrete layer (when it has a certain strength); S3.2. Before pouring the decorative concrete layer, selectively use 1:2 cement mortar to plaster the sides and top surfaces of the permeable concrete; S3.3. When pouring the decorative concrete, control the consistency of the concrete and only fill the concave positions of the permeable concrete layer to make it integrate with the base permeable concrete layer; S3.4. After the decorative concrete is poured, cover it with a printing mold, a wet cotton cloth and a plastic film for moisture conservation curing. The curing time is 7 to 14 days.

[0016] The present invention provides a decorative concrete with a composite permeable function and its construction method. It has the following beneficial effects: 1. By adopting a multi-layer structure design with a composite permeable function, including a permeable mortar layer, a permeable concrete layer and a decorative concrete layer, the present invention achieves good water permeability while ensuring the aesthetics and decorative effect of the ground. Compared with the existing decorative concrete technology, the latter lacks a permeable function and is difficult to meet the urban rainwater infiltration requirements. The present invention effectively solves this problem, can meet the permeable paving rate requirements of sponge cities, and avoids rainwater retention and waterlogging problems.

[0017] 2. In the design of the permeable concrete layer of the present invention, local strip-shaped protrusions are added and are at the same elevation as the surface layer, achieving the functions of effectively collecting rainwater and separating and decorating. Different from the traditional permeable concrete solution, the present invention not only strengthens the water permeability, but also further improves the decorative function through the strip-shaped protrusion design. The problems of low strength and easy damage at the corners in the prior art are effectively solved. The present invention improves the durability of the concrete, especially showing excellent performance in high-intensity use scenarios such as driving and parking. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of the construction method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to the attached Figure 1 , the embodiments of the present invention provide decorative concrete with a composite permeable function, including: A bottom-layer permeable mortar layer with a water permeability coefficient greater than 0.5 mm / s and a thickness range of 2 - 3 cm; A base-layer permeable concrete layer with a water permeability coefficient greater than that of the bottom-layer permeable mortar layer, and local areas of the permeable concrete layer are provided with strip-shaped protrusions, and the strip-shaped protrusions are at the same elevation as the surface layer; A surface-layer decorative concrete layer, which is poured on the base-layer permeable concrete layer to form an integral structure.

[0021] The thickness of the bottom-layer permeable mortar layer is 2 - 3 cm, and its mixing ratio is: The mass ratio of 525 cement: enhancer: extra-fine sand with a particle size of 0.075 - 0.15 mm: sand with a particle size of 0.8 - 1.4 mm: sand with a particle size of 1.4 - 2.36 mm: water: water reducer is 1600:80:840:1685:7181:436:67.

[0022] The mixing ratio of the base-layer permeable concrete layer is: The mass ratio of 525 cement: enhancer: extra-fine sand with a particle size of 0.075 - 0.15 mm: sand with a particle size of 0.8 - 1.4 mm: sand with a particle size of 1.4 - 2.36 mm: gravel with a particle size of 5 - 10 mm: water: water reducer is 1600:80:504:1242:4967:2661:436:67.

[0023] The mixing ratio of the decorative concrete layer is as follows: The mass ratio of 525 cement: enhancer: extra-fine sand with a particle size of 0.075 - 0.15 mm: sand with a particle size of 1.4 - 2.36 mm: gravel with a particle size of 5 - 10 mm: water: water reducer: defoaming powder is 1624:81:852:1658:3870:443:68:1.7.

[0024] A construction method of decorative concrete with a composite water-permeable function, characterized by comprising the following steps: S1. Pour a water-permeable mortar layer on the subbase. S2. Pour a base water-permeable concrete layer on the water-permeable mortar layer of the subbase. S3. Pour a surface decorative concrete layer on the base water-permeable concrete layer (when it has a certain strength), and the surface of the surface decorative concrete layer is flat, forming an integral structure with the base water-permeable concrete layer.

[0025] Step S1 specifically includes: S1.1. Lay a cement-stabilized gravel layer or a graded gravel layer on the subbase. S1.2. Pour the prepared subbase water-permeable mortar layer according to the mixing ratio on the cement-stabilized gravel layer or the graded gravel layer.

[0026] Step S2 specifically includes: S2.1. Pour the prepared base water-permeable concrete layer according to the mixing ratio on the water-permeable mortar layer of the subbase. S2.2. Set strip-shaped protrusions in local areas of the base water-permeable concrete layer, and the elevation of the strip-shaped protrusions is the same as that of the surface layer.

[0027] Step S3 specifically includes: S3.1. Pour the prepared surface decorative concrete layer according to the mixing ratio on the base water-permeable concrete layer (when it has a certain strength). S3.2. Before pouring the decorative concrete layer, selectively use 1:2 cement mortar to plaster the sides and top surfaces of the water-permeable concrete. S3.3. When pouring the decorative concrete, control the consistency of the concrete and only fill the concave positions of the water-permeable concrete layer to make it integrate with the base water-permeable concrete layer. S3.4. After the decorative concrete is poured, cover it with a printing mold, a wet cotton cloth and a plastic film for moisture conservation, and the conservation time is 7 to 14 days.

[0028] Example 1: Pavement construction Subbase construction: First, clean the subbase area neatly to ensure there is no debris and standing water. Then, lay a cement stabilized macadam layer with a thickness of 15 cm to ensure stability. After that, pour a permeable mortar layer on it, with a thickness set at 2 - 3 cm to ensure that the water permeability reaches above 0.5 mm / s. The mixing ratio is: 1600 kg of 525 cement, 80 kg of enhancer, 840 kg of extra fine sand, 1685 kg of sand with a particle size of 0.8 - 1.4 mm, 7181 kg of sand with a particle size of 1.4 - 2.36 mm, 67 kg of water reducing agent, and 436 kg of water. The inclination of the mortar layer is designed to be away from the rainwater collection port.

[0029] Base permeable concrete construction: After the permeable mortar layer cures, pour the base permeable concrete layer. This layer uses concrete with a water permeability coefficient greater than that of the subbase permeable mortar layer, and local strip-shaped protrusions are set. The strip-shaped protrusions should be at the same elevation as the surface layer, serving the functions of collecting rainwater and decorative separation. The mixing ratio of the concrete is: 1600 kg of 525 cement, 80 kg of enhancer, 504 kg of extra fine sand with a particle size of 0.075 - 0.15 mm, 1242 kg of sand with a particle size of 0.8 - 1.4 mm, 4967 kg of sand with a particle size of 1.4 - 2.36 mm, 2661 kg of 5 - 10 mm gravel, 436 kg of water, and 67 kg of water reducing agent. Note: The strip-shaped protrusions are designed to be spaced 1 meter apart, with a width of 5 cm and a height the same as that of the decorative concrete surface layer.

[0030] Decorative concrete construction: After the strength of the base permeable concrete layer reaches the construction requirements (usually 7 - 14 days), pour the decorative concrete layer. First, use 1:2 cement mortar (coarse sand) to plaster the top (the position below the decorative concrete) and the sides of the permeable concrete. Then, control the consistency of the decorative concrete to prevent it from seeping into the sides of the permeable concrete, and only fill the concave positions of the permeable concrete to ensure the integration of the two layers. The mixing ratio of the decorative concrete is: 1624 kg of 525 cement, 81 kg of enhancer, 852 kg of extra fine sand with a particle size of 0.075 - 0.15 mm, 1658 kg of sand with a particle size of 1.4 - 2.36 mm, 3870 kg of 5 - 10 mm gravel, 443 kg of water, 68 kg of water reducing agent, and 1.7 kg of defoaming powder. After pouring is completed (the surface is leveled), cover it with a printing mold, a wet cotton cloth, and a plastic film for moisture conservation, and set the conservation period to 7 to 14 days.

[0031] Example 2: Construction of the parking lot ground laying Subbase construction: First, clean the parking lot ground to ensure there is no debris or ponding. Then, lay a cement stabilized macadam layer with a thickness controlled at about 20 cm to provide sufficient bearing capacity for the bottom layer. Next, pour a permeable mortar layer with a thickness of 2 - 3 cm, and the permeability coefficient requirement is greater than 0.5 mm / s. The mixing ratio is: 1600 kg of 525 cement, 80 kg of enhancer, 840 kg of extra fine sand, 1685 kg of sand with a particle size of 0.8 - 1.4 mm, 7181 kg of sand with a particle size of 1.4 - 2.36 mm, 67 kg of water reducing agent, and 436 kg of water. The slope is set in the direction away from the drainage outlet to ensure the effectiveness of the permeable function.

[0032] Base permeable concrete construction: When the permeable mortar layer hardens to the appropriate strength, start pouring the base permeable concrete layer. The permeability coefficient of this layer should be higher than that of the subbase permeable mortar layer. By setting local strip-shaped protrusions to be consistent with the surface layer elevation, drainage and decoration functions are formed. The mixing ratio of the permeable concrete is: 1600 kg of 525 cement, 80 kg of enhancer, 504 kg of extra fine sand with a particle size of 0.075 - 0.15 mm, 1242 kg of sand with a particle size of 0.8 - 1.4 mm, 4967 kg of sand with a particle size of 1.4 - 2.36 mm, 2661 kg of stones with a particle size of 5 - 10 mm, 436 kg of water, and 67 kg of water reducing agent. The interval of the strip-shaped protrusions is set at 1 m and the width is 10 cm.

[0033] Decorative concrete construction: After the base permeable concrete layer is cured properly (7 - 14 days), carry out the construction of the decorative concrete. First, use 1:2 cement mortar (coarse sand) to plaster the surface of the permeable concrete layer (the position below the decorative concrete). After that, continue to pour the decorative concrete, controlling the consistency of the concrete to avoid its penetration into the permeable concrete. The mixing ratio of the decorative concrete is: 1624 kg of 525 cement, 81 kg of enhancer, 852 kg of extra fine sand with a particle size of 0.075 - 0.15 mm, 1658 kg of sand with a particle size of 1.4 - 2.36 mm, 3870 kg of stones with a particle size of 5 - 10 mm, 443 kg of water, 68 kg of water reducing agent, and 1.7 kg of defoaming powder. After completion (surface leveling), cover with a printing mold, wet cotton cloth, and plastic film for moisture curing, keep it moist, and the curing time is 7 to 14 days.

[0034] Comparative Example 1: Adjustment of the permeability coefficient of the base permeable mortar layer Existing technical solution: In the existing technical solution, the requirement for the permeability coefficient of the permeable mortar layer is relatively low, usually not greater than 0.5 mm / s, and conventional material mixing ratios are mostly used, without particularly paying attention to the effect of the permeable mortar layer. For example, the common mixing ratio is the conventional mixing ratio of cement, sand, and aggregate, and the permeable performance may not meet the application scenarios with higher requirements.

[0035] Solution of the present invention: In the solution of the present invention, the bottom base pervious mortar layer is required to have a pervious coefficient greater than 0.5 mm / s. Through a special proportion design, additives such as extra-fine sand and water reducer are used to improve the water permeability and strength, so that the mortar layer has excellent water permeability and can improve its durability.

[0036] Specific steps: After the soil subgrade is cleaned and compacted, a cement stabilized macadam layer is laid.

[0037] A pervious mortar layer is poured thereon, with a pervious coefficient greater than 0.5 mm / s, a thickness of 2 to 3 cm, and a slope away from the drain outlet.

[0038] Proportion adjustment: Extra-fine sand and water reducer are added more than the existing solution, and sand with a suitable particle size is selected to achieve higher water permeability and strength.

[0039] Comparative Example 2: Striped protrusion design of the base pervious concrete Existing technical solution: In the existing technical solution, the base pervious concrete layer generally does not consider the design of local protrusions. Usually, the surface is evenly poured and leveled to ensure the overall water permeability and strength, but the local design for increasing drainage and decoration functions is not considered.

[0040] Solution of the present invention: In the present invention, a striped protrusion design is added to the base pervious concrete layer. These protrusions are at the same elevation as the surface layer and can play the role of collecting rainwater and separating the decorative area. This design not only increases the decoration, but also improves the water permeability and increases the function of collecting rainwater.

[0041] Specific steps: During the construction of the base pervious concrete layer, the design of the striped protrusions ensures that these protrusions are at the same elevation as the surface layer and are locally arranged on the surface layer area at an interval of 1 meter.

[0042] Ensure that the proportion and pouring process of the protrusion part are consistent with those of the base pervious concrete, but the height and width of the protrusion are precisely controlled to ensure its neat connection with the decorative concrete surface layer.

[0043] Comparative Example 3: Screeding treatment before the construction of decorative concrete Existing technical solution: In the existing technology, there is no special screeding treatment step before the construction of decorative concrete. The decorative concrete is directly poured on the base without considering the composite function of water permeability.

[0044] Solution of the present invention: Before the decorative concrete construction, the surface of the permeable concrete (the position below the decorative concrete) is plastered with 1:2 cement mortar (coarse sand), which enhances the bonding force between concrete layers and avoids the problem of plugging holes caused by the penetration of cement slurry into the permeable concrete.

[0045] Specific steps: After the base permeable concrete is poured and reaches a certain strength, use 1:2 cement mortar (coarse sand) for plastering (the position below the decorative concrete) to ensure filling the concave positions on the surface of the permeable concrete and enhancing the bonding force.

[0046] Then start pouring the decorative concrete and control the consistency of the concrete so that it only fills the concave positions on the side of the permeable concrete and integrates with the base to form a whole.

[0047] Comparative Example 4: Improvement of the durability of permeable concrete Existing technical solution: Traditional permeable concrete has the disadvantages of poor durability, especially easy damage at the corners, and it is difficult to cope with high-intensity use environments. It is prone to damage in places such as sidewalks and parking lots.

[0048] Solution of the present invention: Through the design of strip-shaped protrusions and the side strengthening plastering treatment, the present invention significantly improves the durability of permeable concrete. Especially when used in high-intensity places such as driving and parking, it can effectively reduce the damage at the corners and extend the service life.

[0049] Specific steps: During the construction of permeable concrete, ensure that the designed strip-shaped protrusions are neat and meet the strength standards, and can be integrated with the decorative concrete.

[0050] After the decorative concrete construction is completed, carry out fine maintenance treatment to ensure the effective combination between the permeable concrete and the vertical surface of the decorative concrete.

[0051] Test Experiment 1: Comprehensive test of water permeability and durability Experimental purpose: This experiment aims to test the overall performance of the present invention compared with the existing technology in terms of water permeability and durability. Especially to test whether the design of the composite water permeability function can significantly enhance the durability of concrete while ensuring the water permeability performance, and solve the problems of insufficient strength and easy damage at the corners existing in traditional permeable concrete.

[0052] Experimental method: Experimental materials: Group of Example 1: Use the composite water permeability function concrete of the present invention, including a permeable mortar layer, a permeable concrete layer and a decorative concrete layer.

[0053] Example 2 group: Construction was carried out according to the ratio of Example 2, which also included a permeable mortar layer, a permeable concrete layer, and a decorative concrete layer.

[0054] Control group 1: A traditional permeable mortar layer of the prior art was used, and the permeability coefficient was not greater than 0.5 mm / s.

[0055] Control group 2: A traditional permeable concrete layer was used, without a strip-shaped protrusion design, and the layer thickness was set to a conventional design.

[0056] Control group 3: A traditional decorative concrete layer was used, without additional surface treatment.

[0057] Control group 4: Traditional permeable concrete was used, without a strip-shaped protrusion design and surface plastering treatment.

[0058] Experimental steps: Step 1: Sample preparation A standardized concrete sample preparation process was adopted. For each experimental group, the concrete was proportioned and mixed according to the corresponding design to ensure that the sample sizes of each group were the same (permeability test specimens: diameter 10 cm, thickness 5 cm. Durability test specimens: length 15 cm, width 15 cm, thickness 15 cm). Ensure that the same batch of raw materials was used during sample preparation to guarantee experimental consistency.

[0059] Step 2: Permeability test To ensure the accuracy of the permeability test data for each group of samples, a standard permeability coefficient test device was used for the permeability coefficient experiment in the experiment. First, measure the diameter and thickness of the cylindrical specimen, and calculate the upper surface area of the specimen. Then, seal the four sides of the specimen with a sealing material to prevent water leakage from the side. After the sealing material has cured, perform a vacuum treatment. Then, place it in the permeability coefficient test device, record the amount of water flowing out in 5 minutes, measure it 3 times, and take the average value. Calculate the permeability coefficient. And compare the data of each group of samples.

[0060] Step 3: Durability test Place the cured samples in a freeze-thaw cycle device, set the cooling and heating times and temperatures according to the test standard requirements, and perform multiple freeze-thaw cycles. Each freeze-thaw cycle usually takes 2 to 4 hours to complete. After each freeze-thaw cycle, test the compressive strength, mass loss, etc. of the samples, and record the damage conditions and changes in compressive strength of the samples.

[0061] Step 4: Recording and analysis of experimental results Record data such as permeability performance and compressive strength, and compare the permeability, strength, and durability after freeze-thaw cycles of each group of samples. Finally, conduct a comprehensive evaluation through indicators such as permeability coefficient and compressive strength.

[0062] Summary: Through the comparison of experimental data, the permeability coefficient of the Example 1 group is 0.6 mm / s, which is significantly higher than that of the Comparative Example group, indicating that the design of the present invention has significant advantages in terms of water permeability. At the same time, the Example 1 group also shows relatively excellent performance in terms of compressive strength, reaching 40 MPa, and there is no obvious damage after freeze-thaw cycles, demonstrating its excellent durability. In contrast, the performance of the traditional permeable concrete and decorative concrete groups is weak, with lower compressive strength, and corner damage and strength reduction occur after freeze-thaw cycles, proving that the existing technical solutions perform poorly under high-strength loads. Through the composite permeable function design, the present invention not only improves the water permeability but also significantly enhances the durability, solving the problems of insufficient strength and easy damage at the corners of permeable concrete in the prior art.

[0063] The surface layer thickness and strength are designed according to the vehicle load in accordance with the specifications, and there is no need to conduct a bond strength test between the surface layer and the base layer.

[0064] The experimental results prove that the present invention has strong market application potential, especially in scenarios requiring high durability and strong water permeability, showing relatively excellent performance.

[0065] The above describes the present invention and its implementation manners. Such description is not restrictive. If those of ordinary skill in the art are inspired by it and design similar implementation manners and embodiments without creative work without departing from the gist of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. Decorative concrete with composite water-permeable function, characterized in that: include: The permeable mortar layer of the subbase has a water permeability coefficient greater than 0.5mm / s and a thickness ranging from 2-3cm; The base permeable concrete layer has a water permeability coefficient greater than that of the subbase permeable mortar layer, and a strip-shaped protrusion is provided in a local area of ​​the permeable concrete layer, and the strip-shaped protrusion is consistent with the elevation of the surface layer; The surface decorative concrete layer is poured on the base permeable concrete layer to form an integral structure.

2. The decorative concrete with composite water-permeable function according to claim 1, characterized in that: The thickness of the subbase permeable mortar layer is 2-3 cm, and its proportion is: The mass ratio of 525 cement: reinforcing agent: 0.075-0.15mm particle size extra fine sand: 0.8-1.4mm particle size sand: 1.4-2.36mm particle size sand: water: water reducer is 1600:80:840:1685:7181:436:

67.

3. The decorative concrete with composite water-permeable function according to claim 1, characterized in that: The mix ratio of the base permeable concrete layer is: The mass ratio of 525 cement: reinforcing agent: 0.075-0.15mm particle size extra fine sand: 0.8-1.4mm particle size sand: 1.4-2.36mm particle size sand: 5-10mm particle size gravel: water: water reducer is 1600:80:504:1242:4967:2661:436:

67.

4. The decorative concrete with composite water-permeable function according to claim 1, characterized in that: The proportion of the decorative concrete layer is: The mass ratio of 525 cement: reinforcing agent: 0.075-0.15mm particle size extra fine sand: 1.4-2.36mm particle size sand: 5-10mm particle size gravel: water: water reducer: defoaming powder is 1624:81:852:1658:3870:443:68:1.

7.

5. A method for constructing decorative concrete with composite water-permeable function, characterized in that: The following steps are involved: S1. pouring a permeable mortar layer on the base layer; S2, pouring a base layer of permeable concrete on the base layer of permeable mortar; S3. Casting a surface decorative concrete layer on the base permeable concrete layer (when it has a certain strength), wherein the surface decorative concrete layer has a smooth surface and forms an integrated structure with the base permeable concrete layer.

6. The construction method of decorative concrete with composite water-permeable function according to claim 5, characterized in that: The S1 step specifically includes: S1.

1. Lay a cement stabilized crushed stone layer or a graded crushed stone layer on the base layer; S1.

2. Pour the subbase permeable mortar layer prepared according to the proportion on the cement stabilized crushed stone layer or graded crushed stone layer.

7. The construction method of decorative concrete with composite water-permeable function according to claim 5, characterized in that: The S2 step specifically includes: S2.

1. Pour the base permeable concrete layer prepared according to the proportion on the subbase permeable mortar layer; S2.

2. Strip-shaped protrusions are set in local areas of the base permeable concrete layer, and the elevation of the strip-shaped protrusions is consistent with the elevation of the surface layer.

8. The construction method of decorative concrete with composite water-permeable function according to claim 5, characterized in that: The S3 step specifically includes: S3.

1. Pour the surface decorative concrete layer prepared according to the proportion on the base permeable concrete layer (when it has a certain strength); S3.

2. Before pouring the decorative concrete layer, selectively use 1:2 cement mortar to plaster the sides and top of the permeable concrete; S3.

3. When pouring decorative concrete, control the consistency of the concrete and only fill the concave parts of the permeable concrete layer so that it blends with the base permeable concrete layer; S3.

4. After the decorative concrete is poured, cover it with printed molds, wet cotton cloth and plastic film for moisturizing maintenance for 7 to 14 days.

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