A reinforcing material for concrete pavements and method of use
By spraying a combination of dry and wet reinforcing materials onto concrete pavements, the problems of low strength and peeling were solved, resulting in a high-strength, wear-resistant, and weather-resistant concrete pavement surface, and avoiding efflorescence.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HUAIYIN INSTITUTE OF TECHNOLOGY
- Filing Date
- 2023-06-16
- Publication Date
- 2026-06-26
AI Technical Summary
Existing concrete pavement hardeners suffer from low strength, easy detachment, and efflorescence, and lack quality control standards.
The reinforcing agent, which combines dry and wet materials, is sprayed onto the concrete surface using a spraying machine and sprayer, and then polished. The dry material includes white cement clinker, modified mineral powder, tailings sand, and lithium slag powder, while the wet material includes nano-silica sol, polyaluminum, and other components. It forms a whole that bonds with the concrete, consumes calcium hydroxide, and forms a protective film.
It improves the early strength and crack resistance of concrete pavement, avoids the shedding of hardener and efflorescence, and ensures the wear resistance and weather resistance of the pavement surface.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of concrete pavement technology, and in particular to a concrete pavement reinforcing material and its application method. Background Technology
[0002] Colored concrete pavement is a construction technique widely used in recent years to beautify and decorate urban surfaces. It involves using a base layer of fine aggregate concrete at least 50mm thick, then applying colored concrete hardener to the surface before stamping. It boasts vibrant and rich colors, creating patterns resembling natural marble, granite, various bricks, and wood on ordinary concrete surfaces, offering a rustic and natural aesthetic. This overcomes the drawbacks of natural materials, such as high cost, cumbersome construction, susceptibility to water seepage and damage at joints, and unsuitability for repeated heavy compaction. However, stamped concrete pavement often experiences peeling and flaking, primarily due to poor quality concrete hardeners and the lack of national quality control standards for them.
[0003] Colored concrete hardeners are generally composed of white cementitious materials, wear-resistant aggregates, hardeners, and pigments. Their function is to improve the strength, wear resistance, chemical resistance, weather resistance, and color retention of the pavement surface. Currently, there is limited publicly available information on colored concrete hardeners.
[0004] ZL201811048810.9 introduces a type of stamped concrete flooring, also known as artistic flooring, patterned concrete, or concrete stamped concrete. It is a colored flooring hardener synthesized from special wear-resistant mineral aggregates, high-grade cement, inorganic pigments, and polymer additives. Through construction processes such as stamping, finishing, and sealing, it produces extraordinary stone textures and rich color effects on the concrete surface.
[0005] ZL201810488479.6 describes a method for preparing waterproof reinforced concrete for buildings. The method involves weighing silica powder, synthetic resin, and lignin sequentially and placing them in a container. Water is then added and the mixture is stirred until homogeneous. The mixture is then mixed using an ultrasonic mixer. After homogeneity, the mixture is removed and placed in a mixing tank at 140-160℃ and 70-80% relative humidity, and continuously stirred at 80-100 r / min for 4-6 hours. The mixture is then allowed to cool naturally for later use.
[0006] ZL201711032073.9 describes a high-strength sound-insulating honeycomb paper wall panel and its preparation method. The reinforcing material is composed of the following components by weight: 40-60 parts polypropylene resin, 10-15 parts locust wood chips, 10-20 parts polyester fiber, 20-30 parts ethylene-vinyl acetate copolymer, 5-10 parts aluminum powder, 3-5 parts bentonite, 5-20 parts cement, and 30-50 parts water.
[0007] ZL200810053922.3 introduces a formula and manufacturing method for colored floor stamping cement. The formula is as follows: 1000g red cement, 300g 16-mesh quartz sand, 4000g yellow cement, 2500g Jixian river sand, 1000g black cement, 1000g 60~80 mesh quartz sand, 150g gypsum powder, and 50g early strength powder.
[0008] Current concrete hardeners are basically dry cement powder (with or without sand), which is then manually spread on the road surface and polished. This type of hardener has low strength, is prone to delamination and peeling off on the concrete surface, and is also prone to efflorescence. Therefore, this invention provides a concrete pavement hardener and its application method. Summary of the Invention
[0009] Objective of the Invention: To address the problems existing in the prior art, this invention provides a concrete pavement hardener and its application method. The concrete pavement hardener comprises two parts: a dry material and a wet material. The dry material is applied to the concrete surface using a spraying machine or a vibrating screen, while the wet material is applied to the concrete surface using a sprayer, followed by polishing and smoothing. This invention solves the problems of low strength, easy detachment, and efflorescence of traditional hardeners after use.
[0010] Technical Solution: This invention provides a reinforcing material for concrete pavement, comprising dry and wet materials; wherein, the dry material comprises the following parts by weight: 200-400 parts of white cement clinker, 70-120 parts of modified mineral powder, 300-700 parts of tailings sand, 50-140 parts of lithium slag powder, and 5-50 parts of pigment; the wet material comprises component 1 and component 2: component 1 comprises 10-30 parts of nano-silica sol, 10-20 parts of polyaluminum, 10-30 parts of sodium silicate, 5-20 parts of aluminum sulfate, 5-10 parts of urea, and 100-300 parts of water; component 2 comprises 5-10 parts of adhesive powder, 5-10 parts of 3-aminopropyltrimethoxysilane, and 80-90 parts of water.
[0011] Further, the modified mineral powder is specifically prepared by mixing 20-50 parts of mineral powder, 10-30 parts of limestone powder, 5-10 parts of gypsum, 20-40 parts of metakaolin and 10-20 parts of rice husk ash, calcining at 800-1200℃ for 1-3 hours, cooling, and grinding to obtain the modified mineral powder.
[0012] Furthermore, the specific surface area of the modified mineral powder is 300~400m². 2 / kg.
[0013] Furthermore, the tailings sand is one of iron tailings sand and copper slag sand.
[0014] Furthermore, the tailings sand has a particle size between 0.1 and 0.6 mm.
[0015] Furthermore, the tailings sand needs to be soaked or sprayed with a water-reducing agent solution with a water-reducing rate of 0.1% to 1% before use, and then dried.
[0016] Further, the lithium slag powder is specifically prepared by mixing 70% to 90% raw lithium slag powder, 5% to 15% silica fume and 5% to 15% limestone powder by weight, and grinding them to obtain the lithium slag powder.
[0017] Furthermore, the specific surface area of the lithium slag powder is 600~800 m². 2 / kg.
[0018] Furthermore, the alumina content of the polymeric aluminum is greater than 60%.
[0019] The present invention also provides a method for using a concrete pavement hardener as described in any of the preceding claims, comprising the following steps:
[0020] 1) Apply the dry material to the concrete surface using a sprayer at a speed of 1-3 m / s, or pass it through the concrete surface at a constant speed using a vibrating screen, so that 50g-300g of dry reinforcing material is distributed on each square meter of concrete surface, and then perform the first finishing and smoothing.
[0021] 2) Let stand for 10-30 minutes, then spray the wet material component 1 using a sprayer at a rate of 5-30 g / m³. 2 Spray onto the concrete surface, and after 1-5 minutes, spray the wet component 2, making it at a concentration of 1-10 g / m³. 2 Evenly distribute the material on the concrete surface, perform a second finishing process, and smooth it out.
[0022] Beneficial effects: Compared with the prior art, the beneficial effects of the present invention are specifically as follows:
[0023] 1. The cementing materials used in this invention (white cement, modified mineral powder, lithium slag powder) are all white or light in color, which facilitates the color adjustment of the concrete pavement in the later stage. In addition, the cementing materials used in this invention have high early strength and high water demand, which can quickly absorb the residual moisture on the concrete surface and quickly harden the concrete pavement.
[0024] 2. This invention uses high-temperature treatment to prepare modified mineral powder, which improves the early activity of the mineral powder. On the other hand, compared with traditional cementitious materials, it has a low calcium content, which can reduce the problem of alkali return caused by the dissolution of calcium hydroxide after cement concrete hardens. In addition, the modified mineral powder has a high content of active alumina, which can react with calcium hydroxide in white cement, gypsum in lithium slag and other components to form ettringite, which accelerates the setting of concrete pavement and improves the strength and crack resistance of concrete.
[0025] 3. Using lithium slag powder, silica fume, and limestone for co-grinding can improve the grinding efficiency of lithium slag and help disperse silica fume. The use of ultrafine lithium slag powder and silica fume can not reduce the early strength of cement concrete and can ensure its later strength. Most importantly, it has a large water requirement and can quickly consume the free water of concrete pavement.
[0026] 4. Using a shotcrete spraying machine and spraying the shotcrete pavement hardener ensures uniform application. Furthermore, the spraying machine allows the hardener to embed into the unhardened concrete pavement, forming a unified whole and preventing later detachment. After the first finishing, allowing the pavement to stand and then spraying wet hardener allows the nano-silica, polyaluminum, sodium silicate, aluminum sulfate, adhesive powder, and 3-aminopropyltrimethoxysilane in the wet material to react rapidly with calcium hydroxide in the concrete pavement, forming hydrated calcium silicate, hydrated calcium aluminate, and hydrated calcium aluminocarbonate. This consumes the calcium hydroxide on the concrete surface, reducing efflorescence at its source. Simultaneously, it fills the pores in the concrete, forming a protective film on the surface to prevent water loss and cracking due to drying. Polyaluminum in component 1 disperses the nano-silica, making its distribution more uniform, and also provides active alumina for this invention, allowing it to participate in the formation of hydrated calcium aluminocarbonate, consuming calcium hydroxide and reducing efflorescence. Detailed Implementation
[0027] The present invention will now be described in detail with reference to the embodiments.
[0028] Implementation method 1:
[0029] This embodiment provides a reinforcing material for concrete pavement, comprising two parts: dry material and wet material. The dry material includes the following parts by weight: 400 parts white cement clinker, 120 parts modified mineral powder, 700 parts tailings sand, 140 parts lithium slag powder, and 50 parts pigment. The wet material contains two components: component 1 includes 10 parts nano-silica sol, 10 parts polyaluminum, 30 parts sodium silicate, 5 parts aluminum sulfate, 5 parts urea, and 100 parts water; component 2 includes 5 parts adhesive powder, 5 parts 3-aminopropyltrimethoxysilane, and 90 parts water.
[0030] The modified mineral powder mentioned above was prepared by mixing 50 parts mineral powder, 10 parts limestone powder, 5 parts gypsum, 40 parts metakaolin, and 20 parts rice husk ash, calcining at 1200℃ for 3 hours, cooling, and grinding to a specific surface area of 400 m². 2 / kg was prepared.
[0031] The tailings sand mentioned above is iron tailings sand with a particle size of 0.1 mm. Before use, it needs to be soaked in a solution of early-strength polycarboxylate superplasticizer with a water reduction rate of 0.1% and then dried.
[0032] The aforementioned lithium slag powder is made by grinding 70% undisturbed lithium slag powder, 15% silica fume, and 15% limestone powder together, and its specific surface area is 600 m². 2 / kg.
[0033] The alumina content of the above-mentioned polyaluminum is greater than 60%.
[0034] This embodiment also provides a method for using a hardener for concrete pavements, the specific steps of which are as follows:
[0035] 1) Apply the dry material to the concrete surface using a spraying machine at a speed of 1 meter / second, so that 300g of dry material is distributed on each square meter of concrete surface. Then perform the first finishing and smoothing.
[0036] 2) Let stand for 30 minutes, then spray the wet material component 1 using a sprayer at a rate of 30g / m³. 2 Spray onto the concrete surface, wait 1 minute, then spray wet component 2, making it 1g / m³ 2 Evenly distribute the material on the concrete surface, perform a second finishing process, and smooth it out.
[0037] Implementation Method 2:
[0038] This embodiment provides a reinforcing material for concrete pavement, comprising two parts: dry material and wet material. The dry material includes the following parts by weight: 200 parts white cement clinker, 120 parts modified mineral powder, 300 parts tailings sand, 50 parts lithium slag powder, and 5 parts pigment. The wet material contains two components: component 1 includes 30 parts nano-silica sol, 20 parts polyaluminum, 10 parts sodium silicate, 20 parts aluminum sulfate, 10 parts urea, and 300 parts water; component 2 includes 10 parts adhesive powder, 10 parts 3-aminopropyltrimethoxysilane, and 80 parts water.
[0039] The modified mineral powder mentioned above was prepared by mixing 50 parts mineral powder, 30 parts limestone powder, 10 parts gypsum, 20 parts metakaolin, and 10 parts rice husk ash, calcining at 800℃ for 1 hour, cooling, and grinding to a specific surface area of 300 m². 2 / kg was prepared.
[0040] The tailings sand mentioned above is copper slag sand with a particle size of 0.6mm. Before use, it needs to be sprayed with a 1% water-reducing agent solution and dried.
[0041] The aforementioned lithium slag powder is made by grinding 90% undisturbed lithium slag powder, 5% silica fume, and 5% limestone powder together, and its specific surface area is 800 m². 2 / kg.
[0042] The alumina content of the above-mentioned polyaluminum is greater than 60%.
[0043] This embodiment also provides a method for using a hardener for concrete pavements, the specific steps of which are as follows:
[0044] 1) Apply the dry material to the concrete surface using a spraying machine at a speed of 3 meters per second, so that 50g of dry reinforcing material is distributed on each square meter of concrete surface, and then perform the first finishing and smoothing.
[0045] 2) Let stand for 10 minutes, then spray the wet material component 1 using a sprayer at a rate of 5g / m³. 2 Spray onto the concrete surface, and after a 5-minute interval, spray the wet component 2, making it at a concentration of 10g / m³. 2 Evenly distribute the material on the concrete surface, perform a second finishing process, and smooth it out.
[0046] Implementation Method 3:
[0047] This embodiment provides a reinforcing material for concrete pavement, comprising two parts: dry material and wet material. The dry material includes the following parts by weight: 300 parts white cement clinker, 100 parts modified mineral powder, 600 parts tailings sand, 120 parts lithium slag powder, and 20 parts pigment. The wet material contains two components: component 1 includes 20 parts nano-silica sol, 15 parts polyaluminum, 15 parts sodium silicate, 10 parts aluminum sulfate, 8 parts urea, and 200 parts water; component 2 includes 8 parts adhesive powder, 8 parts 3-aminopropyltrimethoxysilane, and 84 parts water.
[0048] The modified mineral powder was prepared by mixing 40 parts mineral powder, 25 parts limestone powder, 8 parts gypsum, 35 parts metakaolin, and 19 parts rice husk ash, calcining at 1180℃ for 3 hours, cooling, and grinding to a specific surface area of 400 m². 2 / kg was prepared.
[0049] The tailings sand mentioned above is iron tailings sand with a particle size of 0.2 mm. Before use, it is sprayed with a 0.1% early-strength polycarboxylate superplasticizer solution and dried.
[0050] The aforementioned lithium slag powder is made by grinding 80% undisturbed lithium slag powder, 10% silica fume, and 10% limestone powder together, and its specific surface area is 700 m². 2 / kg.
[0051] The alumina content of the above-mentioned polyaluminum is greater than 60%.
[0052] This embodiment also provides a method for using a hardener for concrete pavements, the specific steps of which are as follows:
[0053] 1) Pass the dry material through a vibrating screen at a uniform speed across the concrete surface, so that 150g of dry reinforcing material is distributed on each square meter of concrete surface, and then perform the first finishing and smoothing.
[0054] 2) Let stand for 20 minutes, then spray the wet material component 1 using a sprayer at a rate of 15g / m³. 2 Spray onto the concrete surface, wait 1 minute, then spray wet component 2, making it 5g / m³. 2Evenly distribute the material on the concrete surface, perform a second finishing process, and smooth it out.
[0055] Implementation Method 4:
[0056] This embodiment provides a reinforcing material for concrete pavement, comprising two parts: dry material and wet material. The dry material includes the following parts by weight: 300 parts white cement clinker, 120 parts modified mineral powder, 700 parts tailings sand, 80 parts lithium slag powder, and 20 parts pigment. The wet material contains two components: component 1 includes 20 parts nano-silica sol, 20 parts polyaluminum, 15 parts sodium silicate, 10 parts aluminum sulfate, 10 parts urea, and 200 parts water; component 2 includes 10 parts adhesive powder, 10 parts 3-aminopropyltrimethoxysilane, and 80 parts water.
[0057] The modified mineral powder mentioned above was prepared by mixing 50 parts mineral powder, 30 parts limestone powder, 10 parts gypsum, 30 parts metakaolin, and 20 parts rice husk ash, calcining the mixture at 1200℃ for 3 hours, cooling it, and grinding it to a specific surface area of 400 m². 2 / kg was prepared.
[0058] The tailings sand mentioned above is iron tailings sand with a particle size of 0.1 mm. Before use, it needs to be soaked in a solution of early-strength polycarboxylate superplasticizer with a water reduction rate of 0.5% and then dried.
[0059] The aforementioned lithium slag powder is made by grinding 80% undisturbed lithium slag powder, 10% silica fume, and 10% limestone powder together, and its specific surface area is 800 m². 2 / kg.
[0060] The alumina content of the above-mentioned polyaluminum is greater than 60%.
[0061] This embodiment also provides a method for using a hardener for concrete pavements, the specific steps of which are as follows:
[0062] 1) Apply the dry material to the concrete surface using a spraying machine at a speed of 2 meters per second, so that 50g of dry hardener is distributed on each square meter of concrete surface. Then perform the first finishing and smoothing.
[0063] 2) Let stand for 20 minutes, then spray the wet material component 1 using a sprayer at a rate of 20g / m³. 2 Spray onto the concrete surface, wait 1 minute, then spray wet component 2, making it 5g / m³. 2 Evenly distribute the material on the concrete surface, perform a second finishing process, and smooth it out.
[0064] Performance testing
[0065] Table 1 shows the performance evaluation indicators of this invention. The strength of the concrete hardener (water-cement ratio 0.4) and the standard consistency water requirement were evaluated according to GB / T 17671-1999 "Test Method for Strength of Cement Mortar (ISO Method)" and GB / T 1346-2011 "Test Method for Standard Consistency Water Requirement, Setting Time and Soundness of Cement". 28 days after spraying the hardener onto the reference concrete pavement, the surface peeling and efflorescence were observed visually.
[0066] The standard pavement mix proportion consists of 300 parts C30 concrete, 100 parts P·O42.5 cement, 750 parts sand, 1150 parts gravel, 160 parts water, and 4 parts polycarboxylate superplasticizer (water reduction rate 1.0%). The comparative reinforcement mix proportion consists of 400 parts P·O42.5 cement and 600 parts quartz sand.
[0067] Table 1
[0068]
[0069] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent transformations or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.
Claims
1. A reinforcing material for concrete pavement, characterized in that: The material includes dry and wet components. The dry component comprises the following parts by weight: 200-400 parts white cement clinker, 70-120 parts modified mineral powder, 300-700 parts tailings sand, 50-140 parts lithium slag powder, and 5-50 parts pigment. The wet component comprises component 1 and component 2: component 1 comprises 10-30 parts nano-silica sol, 10-20 parts polyaluminum, 10-30 parts sodium silicate, 5-20 parts aluminum sulfate, 5-10 parts urea, and 100-300 parts water; component 2 comprises 5-10 parts adhesive powder, 5-10 parts 3-aminopropyltrimethoxysilane, and 80-90 parts water. Specifically, the modified mineral powder is prepared by mixing 20-50 parts mineral powder, 10-30 parts limestone powder, 5-10 parts gypsum, 20-40 parts metakaolin and 10-20 parts rice husk ash, calcining at 800-1200℃ for 1-3 hours, cooling, and grinding to obtain the modified mineral powder.
2. The concrete pavement reinforcing material according to claim 1, characterized in that: The modified mineral powder has a specific surface area of 300~400 m². 2 / kg.
3. The concrete pavement reinforcing material according to claim 1, characterized in that: The tailings sand is either iron tailings sand or copper slag sand.
4. The concrete pavement reinforcing material according to claim 1, characterized in that: The tailings sand has a particle size between 0.1 and 0.6 mm.
5. The concrete pavement reinforcing material according to claim 1, characterized in that: Before use, the tailings sand needs to be soaked or sprayed with a water-reducing agent solution with a water-reducing rate of 0.1% to 1% and then dried.
6. The concrete pavement reinforcing material according to claim 1, characterized in that: The lithium slag powder is specifically prepared by mixing 70% to 90% raw lithium slag powder, 5% to 15% silica fume and 5% to 15% limestone powder by weight, and then grinding them to obtain the lithium slag powder.
7. The concrete pavement reinforcing material according to claim 6, characterized in that: The lithium slag powder has a specific surface area of 600~800 m². 2 / kg.
8. A method of using a concrete pavement hardener as described in any one of claims 1-7, characterized in that: Includes the following steps: 1) Apply the dry material to the concrete surface using a sprayer at a speed of 1-3 m / s, or pass it through the concrete surface at a constant speed using a vibrating screen, so that 50g-300g of dry reinforcing material is distributed on each square meter of concrete surface, and then perform the first finishing and smoothing. 2) Let stand for 10-30 minutes, then spray the wet material component 1 using a sprayer at a rate of 5-30 g / m³. 2 Spray onto the concrete surface, and after 1-5 minutes, spray the wet component 2, making it at a concentration of 1-10 g / m³. 2 Evenly distribute the material on the concrete surface, perform a second finishing process, and smooth it out.