Polyurethane cementation protection integrated color pervious concrete and preparation and application thereof

Abstract

This invention discloses a polyurethane-bonded and protected integrated colored permeable concrete, its preparation, and its application. The permeable concrete, by weight, comprises 1000-2000 parts aggregate, 300-500 parts cement, 50-150 parts water, 10-15 parts admixture, and 15-25 parts polyurethane binder; the surface of the permeable concrete is sprayed with a polyurethane colored protective agent. Applying this colored permeable concrete to permeable roads, plazas, landscape paving, parking lots, and other scenarios in sponge cities allows for rapid rainwater infiltration and groundwater replenishment. It also possesses excellent decorative properties and durability, making it suitable for long-term outdoor exposure scenarios and solving the problems of easy aging, fading, and poor mechanical properties of existing permeable paving materials.

Description

Technical Field

[0001] This invention relates to the field of permeable concrete technology, and in particular to a colored permeable concrete using polyurethane as a binder and protective agent, and its preparation and application. Background Technology

[0002] Colored permeable concrete, as a core paving material in sponge city construction, is widely used in urban roads, squares, and landscaped gardens due to its excellent permeability, decorative properties, and ecological characteristics. However, existing colored permeable concrete generally suffers from the following technical defects during long-term outdoor use, severely limiting its application scope and service life: 1. Insufficient bonding performance: Traditional permeable concrete often uses cement as a single binder. The bond strength between cement and aggregate is low, resulting in poor overall mechanical properties of the concrete. It is prone to problems such as aggregate detachment and surface sanding, and cannot meet the requirements of high-load outdoor use. 2. Weak aging resistance: Permeable concrete has a high porosity (usually 15%-25%), and its internal structure is easily eroded by natural environmental factors such as sunlight, oxygen, and rainwater, resulting in surface peeling, cracking, accelerated aging, and shortened service life. 3. Poor color stability: Most of the protective agents used in existing permeable concrete are ordinary organic coatings, which have poor weather resistance. When exposed to the outdoors for a long time, the color is prone to fading and lightening, affecting the decorative effect. In addition, the protective agent has insufficient bonding with the concrete base block and is easy to fall off. 4. Poor performance balance: In existing technologies, improving permeability will sacrifice mechanical properties such as compressive strength and adhesion, while strengthening mechanical properties will reduce the permeability coefficient. It is difficult to achieve synergistic optimization of permeability and mechanical properties. At the same time, the fluidity and construction adaptability of cement paste are not good, which increases the construction difficulty.

[0003] To address the aforementioned technical deficiencies, those skilled in the art have attempted to improve performance by optimizing the formulation of binders or protective agents. However, existing solutions often employ a "separate binder and protective agent" design, where the binder is responsible for bonding the aggregates, while the protective agent is only used for surface protection. The two have no synergistic effect and cannot fundamentally solve the aforementioned multiple defects. For example, some solutions use epoxy resin as a binder, which can improve bond strength, but it has poor weather resistance and is prone to yellowing. Other solutions use acrylic protective agents, which can temporarily improve surface finish, but their adhesion to the concrete substrate is weak, leading to peeling and flaking, and they cannot simultaneously achieve both mechanical and permeability properties.

[0004] Therefore, developing a colored permeable concrete that can simultaneously solve technical problems such as insufficient bonding strength, poor aging resistance, unstable color, and uneven performance, achieving integrated bonding and protection, and being environmentally friendly and easy to construct, has become an urgent technical challenge in this field and is also the core research and development goal of this invention.

[0005] The purpose of this invention is to provide a polyurethane-bonded and protected integrated colored permeable concrete, its preparation, and its application. This invention, through innovative formula design and preparation process, achieves integrated bonding and protection, simultaneously improving the concrete's bond strength, mechanical properties, permeability, weather resistance, and color stability. This addresses the shortcomings of existing technologies and meets the long-term usage requirements of outdoor paving in sponge cities.

[0006] A polyurethane-bonded and protected integrated colored permeable concrete, wherein the permeable concrete, by weight, comprises 1000-2000 parts of aggregate, 300-500 parts of cement, 50-150 parts of water, 10-15 parts of admixture, and 15-25 parts of polyurethane binder; and the surface of the permeable concrete is sprayed with a polyurethane colored protective agent.

[0007] Preferably, the aforementioned polyurethane-bonded and protected integrated colored permeable concrete comprises, by weight, 1500 parts aggregate, 400 parts cement, 100 parts water, 13.5 parts admixture, and 20 parts polyurethane binder.

[0008] Preferably, in the aforementioned polyurethane-bonded and protected integrated colored permeable concrete, the aggregate is crushed stone with a particle size of 5mm-8mm, and the cement is P.O42.5 ordinary Portland cement.

[0009] Preferably, in the aforementioned polyurethane-bonded and protected integrated colored permeable concrete, the polyurethane binder, by weight, comprises 30-50 parts water-reducing agent, 800-1000 parts silica powder, 80-120 parts calcium powder, 1-10 parts cellulose, 30-70 parts adhesive powder, and 10-30 parts polyurethane.

[0010] Preferably, in the aforementioned polyurethane-bonded and protected integrated colored permeable concrete, the polyurethane is one of polyester polyol polyurethane, polyether polyol polyurethane, aliphatic polyurethane, or aromatic polyurethane.

[0011] Preferably, in the aforementioned polyurethane-bonded and protected integrated colored permeable concrete, the polyurethane color protective agent, by weight, comprises 80-120 parts of polyester polyol polyurethane, 30-50 parts of diluent, 3-5 parts of brightening agent, 0.3-0.8 parts of retarder, and 2-6 parts of colored pigment.

[0012] A method for preparing the aforementioned colored permeable concrete includes the following steps: S1. Take water-reducing agent, silica powder, calcium powder, cellulose, adhesive powder and polyurethane, mix them evenly in proportion to obtain polyurethane binder; S2. Take aggregates, cement, water and admixtures, mix them in proportion to obtain basic mixture; S3. Add the polyurethane binder to the base mixture in proportion, stir evenly, and obtain the permeable concrete mixture; S4. Pour the permeable concrete mixture into shape, cure it according to standard, and obtain concrete blocks; S5. Take polyester polyol polyurethane, diluent, brightening agent, retarder and colored pigment, stir evenly to obtain polyurethane color protectant; S6. Apply polyurethane color protective agent to the surface of the concrete base block and allow it to cure naturally to obtain the finished colored permeable concrete.

[0013] Preferably, in the aforementioned method for preparing colored permeable concrete, the standard curing environment described in S4 has a humidity of ≥90% and a temperature controlled at 20±2℃.

[0014] Preferably, in the aforementioned method for preparing colored permeable concrete, the spraying thickness of the polyurethane colored protective agent in S6 is 0.2-0.3 mm, and the natural curing time is ≥24 h.

[0015] An application of the aforementioned colored permeable concrete in permeable pavement for sponge cities. Using the colored permeable concrete in permeable roads, plazas, landscape paving, parking lots, and other scenarios within sponge cities allows for rapid rainwater infiltration and groundwater replenishment. It also possesses excellent decorative properties and durability, making it suitable for long-term outdoor exposure scenarios and solving the problems of easy aging, fading, and poor mechanical properties of existing permeable pavement materials.

[0016] 1. This invention uses polyurethane as the core component of both the binder and the protective agent. The polyurethane in the binder and the polyester polyol polyurethane in the protective agent have good compatibility. The protective agent can penetrate into the pores on the surface of the concrete block and form an overall protective system with the internal binder. This solves the problem of insufficient bonding strength of traditional binders and the defects of traditional protective agents that are not tightly bonded to concrete and are easy to fall off, achieving the dual effect of "strong internal bonding and excellent surface protection". 2. This invention optimizes the formulation of polyurethane binder by compounding water-reducing agents, silica fume, cellulose, and other components, and by selecting aggregates of specific particle sizes. This achieves synergistic optimization of cement paste fluidity, bond strength, compressive strength, and permeability coefficient. The cement paste fluidity reaches 190mm, meeting construction requirements; the bond strength reaches 31MPa, significantly higher than the strength of ≤25MPa typically found in existing technologies; and the permeability coefficient reaches 5.9mm / s. While ensuring mechanical properties, the permeability is superior to similar commercially available products, solving the technical problem of "difficulty in balancing permeability and mechanical properties" in existing technologies. 3. This invention selects polyester polyol polyurethane as the core component of the protective agent, combined with colored pigments and a specific component ratio, so that the concrete surface does not peel and the color remains unchanged after 120 days of open-air aging. The weather resistance and color stability are significantly better than the existing technology that usually peels and fades after 60 days. At the same time, the polyurethane in the binder further improves the uniformity and stability of the color, avoiding the problems of uneven color and easy fading of traditional permeable concrete. 4. This invention adopts a room temperature curing process, which eliminates the need for high-temperature curing, making construction convenient and reducing construction costs; all raw materials used are environmentally friendly, with no release of toxic or harmful substances, meeting the environmental protection requirements for sponge city construction; at the same time, the formula is rationally designed and the raw material dosage is precise, avoiding raw material waste and improving the cost-effectiveness of the materials. Attached Figure Description

[0017] Appendix Figure 1 This is a comparison chart of the flowability of cement paste using polyurethane binders with different colored fillers according to the present invention; from Figure 1 It can be seen that the red filler polyurethane binder has the best cement paste fluidity, reaching 190mm, while the fluidity of the yellow, blue, and green filler polyurethanes decreases in that order, which is suitable for the construction requirements of permeable concrete.

[0018] Appendix Figure 2 This is a comparison chart showing the bonding strength of different types of polyurethane to permeable concrete according to the present invention; from Figure 2 It can be seen that the polyester polyol polyurethane with the highest bonding strength is No. 1, reaching 31 MPa. The bonding strength of the aliphatic polyol polyurethane with No. 4, the aromatic polyol polyol polyurethane with No. 3, and the polyether polyol polyurethane with No. 2 decreases in that order, proving that the polyester polyol polyurethane has the best bonding performance. Detailed Implementation

[0019] The present invention will be further described below with reference to embodiments, but these embodiments are not intended to limit the scope of the invention.

[0020] Embodiments of the present invention Example 1

[0021] This embodiment describes a colored permeable concrete using polyurethane as both a binder and a protective agent, and its preparation method is as follows: (1) Take 40g of water-reducing agent, 900g of silica powder, 100g of calcium powder, 5g of cellulose, 50g of adhesive powder, and 20g of polyester polyol polyurethane, mix them evenly to obtain polyurethane binder. (2) Take 1500g of 5mm-8mm crushed stone, 400g of P.O42.5 cement, 100g of water and 13.5g of admixture, mix and stir to obtain the basic mixture; (3) Add polyurethane binder to the base mixture and stir evenly to obtain permeable concrete mixture; (4) The mixture is poured into shape, cured under standard conditions for 28 days, with ambient humidity controlled at ≥90% and temperature controlled at 20±2℃ to obtain concrete blocks; (5) Take 100g of polyester polyol polyurethane and 40g of xylene, add 4g of conventional brightening agent, 0.5g of retarder and 4g of red inorganic pigment, stir evenly to obtain polyurethane color protectant. (6) Apply polyurethane color protective agent to the surface of concrete base block and allow it to cure naturally to obtain colored permeable concrete finished product.

[0022] The concrete cement paste prepared in this embodiment has a fluidity of 190 mm, a bond strength of 31 MPa, a 7-day compressive strength of 18.6 MPa, a 28-day compressive strength of 31.1 MPa, a permeability coefficient of 5.9 mm / s, and does not peel or change color after 120 days of aging. Example 2

[0023] This embodiment uses colored permeable concrete, and is otherwise the same as in Embodiment 1, except that the polyurethane is replaced with polyether polyol polyurethane.

[0024] The concrete prepared in this embodiment peels off its surface and lightens in color after 120 days of aging, and its bonding strength is lower than that in Example 1. Example 3

[0025] This embodiment uses colored permeable concrete, and is otherwise the same as in Embodiment 1, except that the polyurethane is replaced with aliphatic polyurethane.

[0026] The concrete prepared in this embodiment peeled off its surface after 120 days of aging, and its bonding strength was slightly lower than that in Example 1. Example 4

[0027] This embodiment uses colored permeable concrete, and is otherwise the same as in Embodiment 1, except that the polyurethane is replaced with aromatic polyurethane.

[0028] The concrete prepared in this embodiment does not peel after 120 days of aging, but its color becomes lighter, and its overall performance is inferior to that of Example 1. Example 5

[0029] This example is a comparative example, using pure colored permeable concrete without the addition of polyurethane binder and protective agent; otherwise, it is the same as in Example 1.

[0030] The concrete prepared in this embodiment has low bonding strength, is prone to aging, has poor color stability, and its mechanical and permeability properties are lower than those of Example 1.

[0031] The concrete performance test results of Examples 1-5 are shown in Table 1 below: Example 6

[0032] This embodiment is a polyurethane-bonded and protected integrated colored permeable concrete, which, by weight, includes 2000 parts of aggregate, 500 parts of cement, 150 parts of water, 15 parts of admixture, and 25 parts of polyurethane binder; the polyurethane binder, by weight, includes 50 parts of water-reducing agent, 1000 parts of silica fume, 120 parts of calcium powder, 10 parts of cellulose, 70 parts of adhesive powder, and 30 parts of polyether polyol polyurethane; the polyurethane color protectant, by weight, includes 120 parts of polyester polyol polyurethane, 50 parts of methyl acetate, 5 parts of polyacrylate high-gloss emulsion, 0.8 parts of retarder, and 6 parts of green inorganic pigment. Example 7

[0033] This embodiment is a polyurethane-bonded and protected integrated colored permeable concrete, which, by weight, includes 1000 parts aggregate, 300 parts cement, 50 parts water, 10 parts admixture, and 15 parts polyurethane binder; the polyurethane binder, by weight, includes 30 parts water-reducing agent, 800 parts silica fume, 80 parts calcium powder, 1 part cellulose, 30 parts adhesive powder, and 10 parts polyether polyol polyurethane; the polyurethane color protectant, by weight, includes 80 parts polyester polyol polyurethane, 30 parts methyl acetate, 3 parts polyacrylate high-gloss emulsion, 0.3 parts retarder, and 2-6 parts yellow inorganic pigment.

[0034] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A polyurethane-bonded and protected integrated colored permeable concrete, characterized in that, The permeable concrete, by weight, comprises 1000-2000 parts of aggregate, 300-500 parts of cement, 50-150 parts of water, 10-15 parts of admixture, and 15-25 parts of polyurethane binder; the surface of the permeable concrete is sprayed with a polyurethane colored protective agent.

2. The polyurethane-bonded and protected integrated colored permeable concrete according to claim 1, characterized in that, The permeable concrete, by weight, comprises 1500 parts aggregate, 400 parts cement, 100 parts water, 13.5 parts admixture, and 20 parts polyurethane binder.

3. The polyurethane-bonded and protected integrated colored permeable concrete according to claim 1 or 2, characterized in that, The aggregate is crushed stone with a particle size of 5mm-8mm, and the cement is P.O42.5 ordinary Portland cement.

4. The polyurethane-bonded and protected integrated colored permeable concrete according to claim 1, characterized in that, The polyurethane binder, by weight, comprises 30-50 parts water-reducing agent, 800-1000 parts silica powder, 80-120 parts calcium powder, 1-10 parts cellulose, 30-70 parts adhesive powder, and 10-30 parts polyurethane.

5. The polyurethane-bonded and protected integrated colored permeable concrete according to claim 4, characterized in that, The polyurethane is one of polyester polyol polyurethane, polyether polyol polyurethane, aliphatic polyurethane, or aromatic polyurethane.

6. The polyurethane-bonded and protected integrated colored permeable concrete according to claim 1, characterized in that, The polyurethane color protectant, by weight, comprises 80-120 parts polyester polyol polyurethane, 30-50 parts diluent, 3-5 parts brightening agent, 0.3-0.8 parts retarder, and 2-6 parts color pigment.

7. A method for preparing colored permeable concrete according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Take water-reducing agent, silica powder, calcium powder, cellulose, adhesive powder and polyurethane, mix them evenly in proportion to obtain polyurethane binder; S2. Take aggregates, cement, water and admixtures, mix them in proportion to obtain basic mixture; S3. Add the polyurethane binder to the base mixture in proportion, stir evenly, and obtain the permeable concrete mixture; S4. Pour the permeable concrete mixture into shape, cure it according to standard, and obtain concrete blocks; S5. Take polyester polyol polyurethane, diluent, brightening agent, retarder and colored pigment, stir evenly to obtain polyurethane color protectant; S6. Apply polyurethane color protective agent to the surface of the concrete base block and allow it to cure naturally to obtain the finished colored permeable concrete.

8. The method for preparing colored permeable concrete according to claim 7, characterized in that, The standard maintenance environment described in S4 has a humidity of ≥90% and a temperature controlled at 20±2℃.

9. The method for preparing colored permeable concrete according to claim 7, characterized in that, The coating thickness of the polyurethane color protective agent in S6 is 0.2-0.3 mm, and the natural curing time is ≥24 hours.

10. The application of colored permeable concrete according to any one of claims 1-6 in permeable pavement of sponge cities.

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