Repair method for rapid construction of concrete pavement

Abstract

The invention relates to the technical field of concrete pavement repairing, and particularly discloses a repairing method for rapid construction of a concrete pavement. A repairing method for rapid construction of a concrete pavement comprises the following steps that S1, pit hole pretreatment is conducted, specifically, sundries in a pit hole are cleaned up, a grouting material and water are evenly mixed to obtain repairing slurry, and the inner surface of the pit hole is coated with the repairing slurry; s2, primary repairing is conducted, specifically, broken stones are filled into the pit hole to the structural depth 0.5-1.0 cm away from the road surface, the broken stones are spread and leveled, and repairing slurry is injected into the pit hole to the structural depth 1.0-2.0 cm away from the road surface; and S3, secondary repairing: after the repairing slurry poured in the step S2 is initially set, sand grains are mixed with the repairing slurry, the pits are filled to be flush with the road surface, and maintenance treatment is performed after initial setting. The repairing method is simple and easy to construct, construction tools are simple and easy to carry, manpower, working hours and cost can be greatly saved, and the rapid repairing effect is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of concrete pavement repair, and in particular to a repair method for rapid construction of concrete pavement. Background Art

[0002] Concrete pavement is a road surface with cement concrete as the main material. It is a rigid pavement with strong load-bearing capacity, good wear resistance and good anti-skid properties. It is widely used in various types of roads, including urban roads, highways and airport runways.

[0003] However, as the concrete pavement is used for a longer time, it will be damaged to varying degrees due to the combined effects of vehicle loads, temperature changes, rainy and snowy weather, etc. In order to prevent further damage to the pavement, it needs to be repaired in a timely manner.

[0004] The traditional method of repairing potholes on the road is to place reinforcing ribs in the potholes and then fill the potholes with newly mixed concrete slurry. However, the bonding force between the new concrete and the old concrete is weak, and the strength of the concrete road surface is difficult to restore after the repair. Therefore, the repaired area is easily damaged again, and the reinforcing ribs are prone to rust, which reduces the impermeability of the concrete road surface and shortens the service life of the repaired road surface. In terms of construction, the use of traditional repair methods to repair the road surface is not only inefficient, but also labor-intensive for construction workers. Therefore, it is urgent to find a method that is faster and more durable to repair potholes on the road surface. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present application provides a repair method for rapid construction of concrete pavement. The present application first uses 5-10mm crushed stones to pre-fill the treated potholes on the road surface, and then uses a high-fluidity and high-durability repair slurry to fully fill the gaps between the stones. After hardening, 1.18-2.36mm sand particles are mixed with the repair material to perform overall flattening treatment on the surface, forming a highly durable and excellent volume stability whole. The present application reduces the investment in construction machinery, simplifies the construction process, improves construction efficiency, increases the strength of the road structure, and enhances the road's ability to resist freezing and thawing.

[0006] In a first aspect, the present application provides a repair method for rapid construction of a concrete pavement, which adopts the following technical solution: A repair method for rapid construction of a concrete pavement, the repair method comprising the following steps: S1. Pretreatment of potholes: clean up the debris in the potholes, mix the grouting material with water to obtain the repair slurry, and apply the repair slurry on the inner surface of the potholes; S2. Initial repair: Fill the pothole with crushed stone to a structural depth of 0.5-1.0 cm from the road surface, spread it flat, and inject the repair slurry into the pothole to a structural depth of 1.0-2.0 cm from the road surface; S3, secondary repair: after the repair slurry poured in step S2 has initially set, sand is mixed with the repair slurry to fill the pothole until it is flush with the road surface, and maintenance treatment is performed after the initial setting.

[0007] By adopting the above technical solution, after cleaning the pothole, brushing the repair slurry on its inner surface can improve the bonding effect between the repair material and the inner surface of the pothole, and reduce the absorption of water in the repair slurry by the road base. Larger-sized gravel is used to fill the bottom of the pothole, which has a greater bearing pressure, and its surface needs to be lower than the upper surface of the gravel when the repair slurry is poured for the first time, that is, part of the gravel is exposed on the surface of the repair slurry. Therefore, during the secondary repair, smaller-sized sand particles can be filled in the gaps of the gravel, so that the secondary repair material is embedded with the primary repair material, improving the overall stability and strength of the repair material.

[0008] The repair method in the present application is simple and easy to construct, convenient to operate, saves construction time, and the construction tools used are simple and easy to carry, avoiding the problem of long preparation time in conventional repairs, which can greatly save manpower, working hours and costs, and can achieve the effect of fast construction and fast repair.

[0009] In some specific embodiments, in step S3, the mass of the sand particles is 25% of the mass of the repair slurry.

[0010] Preferably, the particle size of the crushed stone is 5-10 mm, and the particle size of the sand is 1.18-2.36 mm.

[0011] By adopting the above technical solution, the inventors have conducted multiple attempts and tests using gravel and sand of different particle sizes and found that when gravel with a particle size of 5-10mm is used to fill the bottom of the pothole and sand with a particle size of 1.18-2.36mm is used to fill the top, the two can fit more tightly, improving the density and overall strength of the repair material. Moreover, sand with a particle size of 1.18-2.36mm can be used with the repair slurry to beautify the road surface, making the repaired road surface have better integrity and aesthetics.

[0012] Preferably, the grouting material includes the following raw materials in parts by weight: 57-67 parts of silicate cement, 10-20 parts of mineral powder, 10-14 parts of steel slag powder, 4-8 parts of fly ash, 3-7 parts of anhydrous gypsum, 1.0-3.0 parts of water reducer, 0.03-0.07 parts of defoamer, 0.01-0.02 parts of plastic expansion agent, 0.002-0.004 parts of rheological stabilizer and 0.002-0.004 parts of air entraining agent.

[0013] By adopting the above technical scheme, silicate cement, mineral powder, steel slag powder and fly ash are added to make the repair slurry have higher strength, stronger impermeability and durability, and extend the service life of the concrete repair material; the addition of water reducer and rheological stabilizer can improve the fluidity and workability of the repair slurry, and improve the construction efficiency; the plastic expansion agent and defoaming agent work together to reduce the risk of shrinkage and cracking of the repair slurry after solidification, and improve the quality of pothole repair.

[0014] In the present application, the silicate cement is ordinary silicate cement with a strength grade of 52.5; the grade of the mineral powder is S95; the particle size of the fly ash is 1000 mesh; the steel slag powder is steel slag that is ground to 100-150 mesh after magnetic separation and iron removal; and the water reducer is a polycarboxylic acid high-performance water reducer.

[0015] Preferably, in step S1, the mass ratio of water to grouting material is (0.22-0.30):1.

[0016] By adopting the above technical solution, the mass ratio of water to grouting material is controlled within the above range, so that the obtained repair slurry has good fluidity, can fully wrap the gravel and sand, improve the stability and strength of the repair material, and make it not easy to crack and fall off.

[0017] In some specific embodiments, in step S1, the mass ratio of water to grouting material can be 0.22:1, 0.24:1, 0.26:1, 0.28:1 or 0.30:1, etc.

[0018] Preferably, the air entraining agent is triterpene saponin.

[0019] By adopting the above technical solution, triterpenoid saponins as air entraining agents have strong foaming power, and the bubbles produced are small and stable, which helps to improve the fluidity of concrete. In addition, triterpenoid saponins have little effect on the strength of concrete, and can also improve the durability and impermeability of concrete, thereby extending the service life of concrete repair materials.

[0020] Preferably, the grouting material further comprises the following raw materials in parts by weight: 1-4 parts of modified alkali-resistant glass fiber and 3-8 parts of polyoxyethylene octadecyl ether phosphate.

[0021] By adopting the above technical solution, adding modified alkali-resistant glass fiber to the grouting material can form a spatial grid structure inside the concrete repair material, limit the formation and expansion of cracks in the concrete repair material, improve the repair quality, and enhance the strength, toughness and durability of the pothole after repair. Polyoxyethylene octadecyl ether phosphate can be adsorbed on the surface of modified alkali-resistant glass fiber in the preparation of the repair slurry to reduce its surface tension, and the long chain structure of polyoxyethylene octadecyl ether phosphate will cause a steric hindrance effect between the modified alkali-resistant glass fibers, preventing the modified alkali-resistant glass fibers from agglomerating, so that they can be evenly dispersed in the repair slurry, further improving the repair effect.

[0022] Preferably, the mass ratio of the modified alkali-resistant glass fiber to polyoxyethylene octadecyl ether phosphate is 1:(2-4).

[0023] By adopting the above technical solution, further adjusting the mass ratio of modified alkali-resistant glass fiber and polyoxyethylene octadecyl ether phosphate will help improve the dispersibility of modified alkali-resistant glass fiber in the repair slurry, thereby improving the overall performance of the repair slurry and improving the repair effect of potholes.

[0024] In some preferred embodiments, the mass ratio of the modified alkali-resistant glass fiber to polyoxyethylene octadecyl ether phosphate can be 1:2, 1:3 or 1:4, etc.

[0025] Preferably, the method for preparing the modified glass fiber comprises the following steps: T1. First, the alkali-resistant glass fiber is subjected to plasma treatment, and then it is immersed in a silane coupling agent for 15-30 minutes, taken out and dried to obtain a pretreated alkali-resistant glass fiber; T2. Add the pretreated alkali-resistant glass fiber into phenolic resin, stir for 1-2 hours at 70-90°C, take out and dry to obtain modified alkali-resistant glass fiber.

[0026] By adopting the above technical solution, the alkali-resistant glass fiber is first plasma treated to enhance its surface wettability and adhesion, which is convenient for subsequent combination with silane coupling agent. The introduction of silane coupling agent significantly improves the compatibility and interfacial bonding between glass fiber and resin, and enhances the overall performance of modified alkali-resistant glass fiber. After modification with phenolic resin, the toughness and weather resistance of alkali-resistant glass fiber can be effectively improved, which helps to further improve the overall performance of concrete repair materials.

[0027] In the present application, the length of the alkali-resistant glass fiber is 3 mm and the diameter is 3-5 μm.

[0028] Preferably, the plasma treatment conditions are as follows: the treatment frequency is 7-9 kHz, the treatment power is 300 W, and the treatment time is 5-8 min.

[0029] By adopting the above technical solution and the above conditions to perform plasma treatment on the alkali-resistant glass fiber, the wettability of the alkali-resistant glass fiber can be improved and the modification effect can be ensured, and the influence of the plasma treatment on the performance of the alkali-resistant glass fiber can be minimized.

[0030] Preferably, in step T2, 10-30 L of phenolic resin is added to every 1 kg of pretreated alkali-resistant glass fiber.

[0031] By adopting the above technical solution, if the amount of phenolic resin used is too small, the modification effect on the alkali-resistant glass fiber will be poor and the performance of the concrete repair material cannot be effectively improved; if the amount of phenolic resin used is too large, it will not only increase the production cost, but also affect the overall performance of the alkali-resistant glass fiber.

[0032] In some specific embodiments, in step T2, every 1 kg of pretreated alkali-resistant glass fiber is added to 20 L of phenolic resin.

[0033] In summary, the present application includes at least one of the following beneficial technical effects: 1. This application first uses (5-10) mm crushed stones to pre-fill the treated potholes on the road surface, and then uses a high-fluidity and high-durability repair slurry to fully fill the gaps between the stones. After it hardens, 25% of the mass of the slurry (1.18-2.36) mm sand is added to the repair slurry and stirred evenly to flatten the surface as a whole, forming a highly durable and excellent volume stability whole; 2. Adding alkali-resistant glass fiber modified with phenolic resin into the repair slurry can improve the crack resistance and durability of the concrete repair material and extend the service life of the concrete repair material. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the structure of the repair material obtained by the repair method of Example 1; In the figure, 1. repair slurry, 2. crushed stone, 3. sand. DETAILED DESCRIPTION

[0035] In order to make the present application easier to understand, the present application will be further described in detail below in conjunction with the examples, which are merely illustrative and are not intended to limit the scope of application of the present application. The raw materials or components used in the present application can be obtained through commercial routes or conventional methods unless otherwise specified.

[0036] Preparation Example 1: Preparation of modified alkali-resistant glass fiber The preparation method of the modified alkali-resistant glass fiber in Preparation Example 1 is as follows: Take 1 kg of alkali-resistant glass fiber and subject it to plasma treatment. The specific conditions of the plasma treatment are: use air as the medium, treat at atmospheric pressure for 6 minutes, the treatment frequency is 8kHz, and the treatment power is 300W. Soak the plasma-treated alkali-resistant glass fiber in 5L of silane coupling agent KH550 for 20 minutes, take it out and dry it to obtain pretreated alkali-resistant glass fiber. Put 1 kg of pretreated alkali-resistant glass fiber into 20L of phenolic resin, heat it to 80°C and stir it for 1h, filter it and dry the precipitate to obtain modified alkali-resistant glass fiber.

[0037] Preparation Example 2: Preparation of modified alkali-resistant glass fiber The preparation method of the modified alkali-resistant glass fiber in Preparation Example 2 is as follows: 1 kg of alkali-resistant glass fiber is taken, immersed in 5 L of silane coupling agent KH550 for 20 min, taken out and dried to obtain pretreated alkali-resistant glass fiber. Then 1 kg of pretreated alkali-resistant glass fiber is put into 20 L of phenolic resin, heated to 80 ° C. and stirred for 1 h, filtered and dried the precipitate to obtain modified alkali-resistant glass fiber.

[0038] Preparation Example 3-4: Preparation of modified alkali-resistant glass fiber The difference between Preparation Example 3 and Preparation Example 4 and Preparation Example 1 is that the amount of phenolic resin used is 5L and 40L respectively. That is to say, in Preparation Example 3 and Preparation Example 4, 5L and 40L of phenolic resin are added to every 1kg of pretreated alkali-resistant glass fiber respectively, and the rest is the same as Preparation Example 1.

[0039] Embodiment 1-3: Reference Figure 1 The repair method of the concrete pavement in Examples 1-3 is as follows: S1, pothole pretreatment: clean up the debris and loose concrete debris in the pothole, mix the grouting material and water in a mass ratio of 1:0.22 to obtain a repair slurry 1, and apply the repair slurry 1 on the inner surface of the pothole; S2, primary repair: fill the pothole with crushed stone 2 with a particle size of 5-10 mm to a structural depth of 0.5 cm from the road surface, and spread it flat, and inject the repair slurry 1 into the pothole to a structural depth of 1.0 cm from the road surface, that is, part of the crushed stone 2 is exposed on the surface of the repair slurry 1; S3, secondary repair: after the repair slurry 1 poured in step S2 is initially set, use sand particles 3 with a particle size of 1.18-2.36 mm to mix with the repair slurry 1 to fill the pothole until it is flush with the road surface, and perform maintenance after initial setting.

[0040] Among them, the raw materials for preparing the grouting materials in Examples 1-3 and their dosages are shown in Table 1, the defoaming agent is Evonik SITREN AirVoid 362; the plastic expansion agent is Xinyi Synthetic EP-2; the rheological stabilizer is Yingshan New Material RS-04; and the air entraining agent is triterpene saponin.

[0041] Table 1. Raw materials and dosage of grouting materials in Examples 1-7 (kg) Embodiment 4-7: The raw materials and dosage of the grouting materials in Examples 4-7 are shown in Table 1. The difference between them and Example 1 is that in step S1 of the repair method, the mass ratios of the grouting material to water are 1:0.24, 1:0.26, 1:0.28 and 1:0.30, respectively, and the rest are the same as Example 1.

[0042] Embodiment 8: The difference between Example 8 and Example 1 is that the particle size of the crushed stone is 10-15 mm, the particle size of the sand is 3-5 mm, and the rest is the same as Example 1.

[0043] Embodiment 9: The difference between Example 9 and Example 1 is that the particle size of the crushed stone is 4-6 mm, the particle size of the sand is 0.7-1.5 mm, and the rest is the same as Example 1.

[0044] Embodiment 10-11: The raw materials and dosages of the grouting materials in Examples 10-11 are shown in Table 2. The difference between them and Example 1 is that the raw materials for preparing the grouting materials also include modified alkali-resistant glass fiber and polyoxyethylene octadecyl ether phosphate (purchased from Hai'an Petrochemical Plant, Jiangsu Province), and the modified alkali-resistant glass fiber is selected from the modified alkali-resistant glass fiber prepared in Preparation Example 1. The rest is the same as Example 1.

[0045] Table 2. Raw materials and dosage of grouting materials in Examples 10-12 (kg) Embodiment 12-14: The raw materials and dosages of the grouting materials in Examples 12-14 are shown in Table 2. The difference between them and Example 10 is that the dosages of the modified alkali-resistant glass fiber and polyoxyethylene octadecyl ether phosphate are different. The mass ratios of the modified alkali-resistant glass fiber and polyoxyethylene octadecyl ether phosphate in Examples 12-14 are 1:3, 1:2 and 1:4, respectively, and the rest are the same as Example 10.

[0046] Embodiment 15-17: The difference between Examples 15-17 and Example 12 is that the modified alkali-resistant glass fiber is selected from the modified alkali-resistant glass fiber prepared in Preparation Examples 2-4, and the rest is the same as Example 12.

[0047] Comparative Example 1: The difference between Comparative Example 1 and Example 12 is that an equal amount of alkali-resistant glass fiber is used to replace the modified alkali-resistant glass fiber, and the rest is the same as Example 12.

[0048] Test Example 1: The performance tests of the repair slurries in Examples 1-17 and Comparative Example 1 were carried out, specifically including fluidity, water seepage rate, 1d vertical expansion rate, 28d limited shrinkage rate, flexural strength and compressive strength, wherein the fluidity was tested with reference to Appendix A of GB / T 50488 "Technical Specifications for Application of Cement-based Grouting Materials", the water seepage rate was tested with reference to Appendix B of JT / T 946 "Prestressed Duct Grouting Materials for Highway Engineering", the 1d vertical expansion rate was tested with reference to Appendix C of GB 50119 "Technical Specifications for Application of Concrete Admixtures", the 28d limited shrinkage rate was tested with reference to the method specified in JTG E30 "Test Procedures for Cement and Cement Concrete for Highway Engineering" T0511, and the flexural and compressive strengths were tested with reference to GB / T17671 "Test Method for Strength of Cement Mortar" (IOS method), and the test results are shown in Table 2.

[0049] Table 3. Performance test results of repair slurry in Examples 1-17 and Comparative Example 1 It can be seen from the test data in Table 2 that the overall performance of the repair slurries prepared in Examples 1-17 and Comparative Example 1 is good, but the raw materials and dosages of the repair slurries in different examples are different, resulting in differences in the performance of the repair slurries.

[0050] It can be seen from the test results of Examples 1-7 that the repair slurry prepared with reference to Example 1 has higher strength, better comprehensive performance, and excellent fluidity, and is suitable for repairing potholes in the road surface.

[0051] From the test results of Examples 10-14, it can be seen that the performance of the repair slurry can be improved after adding modified alkali-resistant glass fiber and polyoxyethylene octadecyl ether phosphate to the repair slurry, especially the flexural strength and compressive strength are enhanced. From the test results of Examples 15-17 and Comparative Example 1, it can be seen that the contribution of alkali-resistant glass fiber to the performance of the repair slurry after being modified by phenolic resin is more obvious, and the treatment method in the preparation process of modified alkali-resistant glass fiber also has a certain influence on the modification effect. For example, plasma treatment of alkali-resistant glass fiber can improve the modification effect, and controlling the amount of phenolic resin and pre-treated alkali-resistant glass fiber can improve the modification effect.

[0052] Test Example 2: The performance of the repair materials obtained by the repair methods of Examples 1-17 and Comparative Example 1 was tested, specifically including the slurry-stone ratio, 28d limited shrinkage rate and compressive strength, wherein the slurry-stone ratio is the mass ratio of the repair slurry used to the sum of crushed stone and sand when filling the same volume, the 28d limited shrinkage rate is tested with reference to Appendix B of GB 50119 "Technical Specifications for Application of Concrete Admixtures", and the compressive strength is tested with reference to GB / T 50081 "Standard for Test Methods for Mechanical Properties of Ordinary Concrete", and the test results are shown in Table 4.

[0053] Table 4. Performance test results of the repair materials in Examples 1-17 and Comparative Example 1 It can be seen from the test results in Table 4 that the repair material 28d obtained by the repair method in Examples 1-17 and Comparative Example 1 has a smaller limited shrinkage rate and a higher compressive strength. The repair method takes a short time to implement and is easy to construct, and has a good prospect for use in repairing potholes in the road.

[0054] From the test results of Examples 1, 8-9, it can be seen that when 5-10 mm crushed stone is used in combination with 1.18-2.36 mm sand particles, the two can fit more tightly, so that the repair material in the pothole forms a higher strength whole, which can withstand a greater load when filling the pothole in the road surface.

[0055] It can be seen from the test results of Examples 10-17 and Comparative Example 1 that using a slurry with modified alkali-resistant glass fiber to repair potholes in a road surface can improve the repair effect, the overall performance of the repair material is better, and the service life of the repaired road surface can be extended.

[0056] It should be noted that the embodiments described above are only used to explain the present application and do not constitute any limitation to the present application. The present application is described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present application may be modified as specified within the scope of the claims of the present application, and the present invention may be revised without departing from the scope and spirit of the present application. Although the present application described therein relates to specific methods, materials and embodiments, it does not mean that the present application is limited to the specific examples disclosed therein. On the contrary, the present application can be extended to all other methods and applications with the same functions.

Claims

1. A repair method for rapid construction of concrete pavement, characterized in that: The repair method comprises the following steps: S1. Pretreatment of the pothole: clean up the debris in the pothole, mix the grouting material with water to obtain a repair slurry (1), and apply the repair slurry (1) on the inner surface of the pothole; S2, initial repair: fill the pothole with crushed stone (2) to a structural depth of 0.5-1.0 cm from the road surface, spread it evenly, and inject the repair slurry (1) into the pothole to a structural depth of 1.0-2.0 cm from the road surface; S3, secondary repair: after the repair slurry (1) poured in step S2 has initially set, sand (3) is mixed with the repair slurry (1) to fill the pothole until it is flush with the road surface, and maintenance treatment is performed after the initial setting.

2. The repair method according to claim 1, characterized in that: The particle size of the crushed stone (2) is 5-10 mm, and the particle size of the sand (3) is 1.18-2.36 mm.

3. The repair method according to claim 1, characterized in that: Calculated by weight of the grouting material, it includes the following raw materials: 57-67 parts of silicate cement, 10-20 parts of mineral powder, 10-14 parts of steel slag powder, 4-8 parts of fly ash, 3-7 parts of anhydrous gypsum, 1.0-3.0 parts of water reducer, 0.03-0.07 parts of defoamer, 0.01-0.02 parts of plastic expansion agent, 0.002-0.004 parts of rheological stabilizer and 0.002-0.004 parts of air entraining agent.

4. The repair method according to claim 3, characterized in that: In step S1, the mass ratio of water to grouting material is (0.22-0.30):

1.

5. The repair method according to claim 1, characterized in that: The air entraining agent is triterpenoid saponin.

6. The repair method according to claim 3, characterized in that: The grouting material also includes the following raw materials in parts by weight: 1-4 parts of modified alkali-resistant glass fiber and 3-8 parts of polyoxyethylene octadecyl ether phosphate.

7. The repair method according to claim 6, characterized in that: The mass ratio of the modified alkali-resistant glass fiber to polyoxyethylene octadecyl ether phosphate is 1:(2-4).

8. The repair method according to claim 6, characterized in that: The preparation method of the modified glass fiber comprises the following steps: T1. First, the alkali-resistant glass fiber is subjected to plasma treatment, and then it is immersed in a silane coupling agent for 15-30 minutes, taken out and dried to obtain a pretreated alkali-resistant glass fiber; T2. Add the pretreated alkali-resistant glass fiber into phenolic resin, stir for 1-2 hours at 70-90°C, take out and dry to obtain modified alkali-resistant glass fiber.

9. The repair method according to claim 8, characterized in that: The conditions of the plasma treatment are as follows: the treatment frequency is 7-9 kHz, the treatment power is 300 W, and the treatment time is 5-8 min.

10. The repair method according to claim 8, characterized in that: In the step T2, 10-30 L of phenolic resin is added to every 1 kg of pretreated alkali-resistant glass fiber.

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