A protective layer for treating powdered concrete in waterproof sealing layer of high-speed railway foundation and its construction method

Abstract

The present invention discloses a protective layer for treating concrete powdering of a waterproof sealing layer of a high-speed railway subgrade and a construction method. The protective layer is composed of a crack repair material, a waterproof adhesive coating, an epoxy emulsified modified asphalt repair mortar and a heat reflective coating. The protective layer is composed of the crack repair material, the waterproof adhesive coating, the epoxy repair mortar, the waterproof adhesive coating and the heat reflective coating from the inside to the outside. The construction method includes: investigating the disease situation, cleaning the base surface, applying the crack repair material, applying the waterproof adhesive coating, repairing the base surface with the epoxy emulsified modified asphalt repair mortar, applying the waterproof adhesive layer, and applying the heat reflective coating on the surface. The protective layer for treating concrete powdering of a waterproof sealing layer of a high-speed railway subgrade of the present invention is particularly suitable for treating cement concrete powdering in high-cold areas. The protective layer has the advantages of low temperature resistance, freeze-thaw resistance, UV resistance, good durability, etc., and the construction process is simple.

Description

Technical Field

[0001] The invention belongs to the technical field of treatment of concrete pulverization of railway roadbed waterproof sealing layer, in particular to a protective layer for treatment of concrete pulverization of high-speed railway roadbed waterproof sealing layer and a construction method thereof. Background Art

[0002] The waterproof sealing layer concrete of the high-speed railway subgrade has serious concrete shrinkage and pulverization problems under the long-term combined effects of harsh natural conditions such as repeated freezing and thawing in high-altitude cold regions, high-speed wind erosion, and load factors such as high-frequency vibration and mechanical impact. The waterproof sealing layer concrete is an important barrier to prevent rainwater and surface water from entering the subgrade, and is a key component to ensure the long-term stability of the high-speed railway subgrade. If the shrinkage and pulverization of the waterproof sealing layer are not dealt with in time, it will seriously affect the durability of the concrete structure, the stability of the subgrade and the safety of railway operations.

[0003] At present, the common treatment solution for cracking and powdering of cement concrete pavement on general highways is to clean, grind and level the concrete surface, and then apply a thin waterproof coating material. However, considering the harsh climate in high-altitude and cold regions, the high-frequency vibration load of high-speed railways, and the short duration of railway skylights, there are high requirements for the material properties and construction methods of the protective layer used to treat the powdering of the concrete in the waterproof sealing layer. The existing repair solutions are susceptible to shear peeling under the action of high-frequency vibration of dynamic loads, and cannot meet the performance requirements of the protective layer for the powdering of the waterproof sealing layer of the high-speed railway subgrade in high-altitude and cold regions. Moreover, the design service life of the high-speed railway asphalt concrete waterproof sealing layer is not less than 60 years, which far exceeds the 30-year design service life requirement of the highway cement concrete surface layer. In addition, the vibration working environment of the high-speed railway asphalt concrete waterproof sealing layer paved with the entire section is also significantly different from the working environment of the highway asphalt pavement.

[0004] Therefore, it is necessary to take special treatment and protection measures according to the special use environment and extremely long service life requirements of the high-speed railway subgrade waterproof sealing layer. Summary of the invention

[0005] The purpose of the invention is to provide a protective layer for treating the powdering of concrete in the waterproof sealing layer of high-speed railway subgrade in high-cold areas and a construction method thereof; the protective layer has good weather resistance, low temperature resistance, UV resistance, can withstand high-frequency vibration loads, has good durability, simple construction technology and short construction time, and can achieve the purpose of rapid repair.

[0006] Technical solution, a protective layer for treating concrete powdering in a high-speed railway subgrade waterproof sealing layer and a construction method thereof, wherein the protective layer is composed of a crack repair material, a waterproof bonding coating, an epoxy emulsified modified asphalt repair mortar and a heat-reflective coating, and the protective layer is composed of the crack repair material, the waterproof bonding coating, the epoxy repair mortar, the waterproof bonding coating and the heat-reflective coating from the inside to the outside.

[0007] According to a further improvement of the present invention, the raw materials of the epoxy emulsified modified asphalt mortar include fixed-graded stone, mineral powder, water-based epoxy emulsified asphalt, and admixtures, wherein the stone is configured according to the recommended gradation range of stone in Table 1, and the sum of limestone and sand equivalent is greater than 60%; the epoxy emulsified asphalt is composed of modified asphalt and a water-based epoxy resin system.

[0008] Table 1 Recommended grading range of stone

[0009]

[0010] According to a further improvement of the present invention, the modified asphalt is one of SBS modified emulsified asphalt or SBR modified emulsified asphalt; the modified emulsified asphalt comprises: base asphalt, 1.4-2.4 emulsifier, 0.1-0.2% stabilizer, 3-3.5% modifier; the base asphalt is one or more of natural asphalt, petroleum asphalt, tar asphalt and Ssangyong 70#A grade base asphalt.

[0011] According to a further improvement of the present invention, the amount of the water-based epoxy resin system in the water-based epoxy modified emulsified asphalt is 5-15% of the mass of the modified emulsified asphalt, wherein the amount of the curing agent in the water-based epoxy resin system is 0.5-1.0 times the mass of the water-based epoxy resin; the admixture includes: 0.5-1% of an organosilicon defoamer based on the mass of the epoxy emulsified asphalt mortar; 5% fly ash and 3% silica fume based on the mass of the mineral powder.

[0012] According to a further improvement of the present invention, the crack repair material includes a flexible epoxy resin adhesive and a fluorocarbon coating; the flexible epoxy resin adhesive is used to fill concrete cracks with a width of >0.1mm in the waterproof sealing layer; the fluorocarbon coating is: trifluorochloroethylene-vinyl ether, which is used to seal fine cracks in the concrete on the surface of the waterproof sealing layer with a width of less than 0.1mm.

[0013] According to a further improvement of the present invention, the waterproof bonding coating is a silane-modified polymer sealant; the silane-modified polymer sealant is a silane paste or liquid silane.

[0014] According to a further improvement of the present invention, the heat reflective coating is an unsaturated polyurethane coating, comprising the following raw materials: 60 parts of unsaturated polyurethane, 8 parts of butyl acrylate, 10 parts of methyl methacrylate, 5 parts of coating curing system, 13-15 parts of TiO2 / SiO2 filler, and 2 parts of pigment filler; the coating curing system is composed of the following raw materials: 2% of cobalt cyclopentaneate and 3% of ethyl peroxide, based on the mass of the unsaturated polyurethane coating; the TiO2 / SiO2 filler is composed of the following raw materials: 12 parts of TiO2, 6 parts of SiO2 and 2 parts of hollow microspheres, based on the mass of the unsaturated polyurethane; the pigment filler is composed of the following raw materials: 0.5% of iron red and 0.8% of iron green, based on the mass of the unsaturated polyurethane coating.

[0015] According to a further improvement of the present invention, there is also provided a method for constructing a protective layer for treating powdered concrete in a high-speed railway subgrade waterproof sealing layer, comprising the following steps:

[0016] Step 1: Investigation of damage conditions: Investigate the damage conditions of the concrete cover within the scope of the project, classify them according to powdering, cracking, peeling and strength grade, and keep records and mark them on site, and determine different repair and protection plans for different degrees of damage;

[0017] Step 2: Clean the base surface: Use a milling machine to clean the powdered layer of the waterproof sealing layer concrete. After removing the loose concrete, use the well groove method to treat the surface concrete of the sealing layer. Finally, use a hair dryer to blow away the cleaned impurities.

[0018] Step 3, crack repair material application: When the crack width is less than 0.1mm, use the pressure grouting method to inject trifluorochloroethylene-vinyl ether into the crack. After the potting glue is cured, clean the surface of the waterproof sealing layer. When the crack width is greater than or equal to 0.1mm, use the surface covering method to repair and apply a flexible epoxy resin adhesive.

[0019] Step 4: Apply waterproof bonding coating: Apply silane-modified polymer sealant evenly on the waterproof sealing layer after crack treatment, with a dosage of 300-500g / m 2 , brush once or brush twice with an interval of 6 hours, and proceed to the next process after the surface is dry;

[0020] Step 5: Repair the base surface with epoxy emulsified modified asphalt repair mortar: Spread the pre-mixed epoxy emulsified asphalt mortar evenly on the construction surface, rake it flat, compact the middle part with a roller, and tamp both sides separately. The thickness of this layer is controlled to be 2 to 2.5 cm.

[0021] Step 6: Apply waterproof bonding layer: Apply silane-modified polymer sealant evenly on the epoxy emulsified asphalt mortar layer at a dosage of 300-500 g / m 2, brush once or brush twice with an interval of 6 hours, and proceed to the next process after the film is formed;

[0022] Step 7: Apply heat-reflective coating on the surface: Apply unsaturated polyurethane on the waterproof adhesive layer at a dosage of 600-800g / m 2 .

[0023] According to a further improvement of the present invention, when repairing a vertical surface, after applying crack repair material and waterproof adhesive coating, a fixed template with a spacing of 2.5 cm from the vertical surface is erected, epoxy emulsified modified asphalt repair mortar is poured, and vibrated to make it dense, and after the mortar solidifies, the template is removed, and the joint paste is applied to the joint before the next process is carried out.

[0024] Beneficial effects: 1. The protective layer for treating powdered concrete of the waterproof sealing layer of the high-speed railway subgrade of the present invention has the advantages of good weather resistance, water damage resistance, low temperature resistance, UV resistance, ability to withstand high-frequency vibration loads, good durability, etc., and the construction process is simple and the construction time is short, which can achieve the purpose of rapid repair; 2. The present invention adopts 2.5cm epoxy emulsified asphalt mortar to repair the base surface of the waterproof protective layer, avoiding the separation and peeling problem of the repair layer structure of the conventional mortar-filled leveling layer + thin waterproof layer under the combined action of dynamic load high-frequency vibration and harsh environment; 3. The unsaturated polyurethane coating heat-reflective coating on the surface of the protective layer of the present invention can effectively avoid solar radiation, delay the aging process of the protective layer, and improve the durability of the protective layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the protective layer of the present invention.

[0026] Figure 2 This is a diagram of the protective layer structure of Example 1 of the present invention.

[0027] Figure 3 This is a diagram of the protective layer structure of Example 2 of the present invention.

[0028] The markings of the components in the accompanying drawings are as follows:

[0029] 1. Flexible epoxy resin adhesive, 2. Fluorocarbon coating, 3. Waterproof adhesive coating, 4. Epoxy self-compacting / semi-self-compacting asphalt mixture, 5. Heat reflective coating, 6. Fixed formwork, 7. Protective layer for powdering of waterproof sealing layer (its structural components include 1 to 5), 8. Joint paste. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with specific embodiments, and the examples given are only for illustrating the present invention, rather than for limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0031] Example 1: See Figure 2

[0032] A protective layer for treating concrete powdering in a waterproof sealing layer of a high-speed railway subgrade, the protective layer being composed of crack repair materials 1, 2, a waterproof bonding coating 3, an epoxy repair mortar 4 and a heat reflective coating 5. From the inside to the outside, the protective layer is composed of the crack repair materials 1, 2, the waterproof bonding coating 3, the epoxy emulsified asphalt mortar 4, the waterproof bonding coating 3 and the heat reflective coating 5; the crack repair material is a flexible epoxy resin adhesive and chlorotrifluoroethylene-vinyl ether, the waterproof bonding coating is a silane-modified polymer sealant, and the heat reflective coating is an unsaturated polyurethane.

[0033] The epoxy repair mortar is epoxy emulsified asphalt mortar, including stone, mineral powder, water-based epoxy modified emulsified asphalt, cement, and admixtures of certain gradation; the stone is limestone, and the gradation is listed in Table 2. The amount of cement is 1.5%. The modified emulsified asphalt is SBS modified emulsified asphalt, and the amount is 9.3%. The matrix asphalt is Shuanglong 70#A-grade matrix asphalt, 2.0% emulsifier, 0.2% stabilizer, and 3.5% SBS modifier. The amount of water-based epoxy system is 9.3% of the amount of modified emulsified asphalt, and the amount of curing agent is 0.5 times the mass of water-based epoxy resin. The amount of water is 5%, and the amount of mineral powder is 5%. The admixture includes, based on the mass of epoxy emulsified asphalt mortar, 0.5% of organic silicon defoamer; based on the mass of mineral powder, 5% fly ash and 3% silica fume.

[0034] Table 2 Stone gradation

[0035]

[0036] The unsaturated polyurethane coating comprises the following raw materials: 60 parts of unsaturated polyurethane, 8 parts of butyl acrylate, 10 parts of methyl methacrylate, 5 parts of coating curing system, 15 parts of TiO2 / SiO2 filler, and 2 parts of pigment filler. The coating curing system is composed of the following raw materials: 2% of cobalt cyclohexane acid and 3% of ethyl ketone peroxide based on the mass of the unsaturated polyurethane coating; the TiO2 / SiO2 filler is composed of the following raw materials: 12 parts of TiO2, 6 parts of SiO2 and 2 parts of hollow microspheres based on the mass of the unsaturated polyurethane.

[0037] The crack repair material includes a flexible epoxy resin adhesive and a fluorocarbon coating. The flexible epoxy resin adhesive is used to fill concrete cracks with a crack width of the waterproof sealing layer greater than 0.1 mm. The technical indicators of the flexible epoxy resin adhesive should meet the following requirements: slurry density > 1.0 g / cm -3, initial viscosity <200mPa·s, compressive strength ≥40Mpa, tensile strength ≥10MPa, bonding strength to dry base surface ≥3.0MPa, bonding strength to wet base surface ≥2.0Pa, ductility ≥100%; pourability ≤0.1mm, operable time ≥1h; adhesion ≥3.0MPa; -45℃ low temperature flexibility qualified.

[0038] The waterproof bonding coating is a silane-modified polymer sealant; the silane-modified polymer sealant is a silane paste or liquid silane.

[0039] The heat reflective coating is an unsaturated polyurethane coating, which includes the following raw materials: 60 parts of unsaturated polyurethane, 8 parts of butyl acrylate, 10 parts of methyl methacrylate, 5 parts of coating curing system, 13-15 parts of TiO2 / SiO2 filler, and 2 parts of pigment filler; the coating curing system is composed of the following raw materials: 2% of cobalt cyclopentaneate and 3% of ethyl ketone peroxide, based on the mass of the unsaturated polyurethane coating; the TiO2 / SiO2 filler is composed of the following raw materials: 12 parts of TiO2, 6 parts of SiO2 and 2 parts of hollow microspheres, based on the mass of the unsaturated polyurethane; the pigment filler is composed of the following raw materials: 0.5% of iron red and 0.8% of iron green, based on the mass of the unsaturated polyurethane coating.

[0040] A construction method for a protective layer for treating powdered concrete in a high-speed railway subgrade waterproof sealing layer, comprising the following steps:

[0041] Step 1: Investigation of damage conditions: Investigate the damage conditions of the concrete cover within the scope of the project, classify them according to powdering, cracking, peeling and strength grade, and keep records and mark them on site, and determine different repair and protection plans for different degrees of damage;

[0042] Step 2: Clean the base surface: Use a milling machine to clean the powdered layer of the waterproof sealing layer concrete. After removing the loose concrete, use the well groove method to treat the surface concrete of the sealing layer. Finally, use a hair dryer to blow away the cleaned impurities.

[0043] Step 3, crack repair material application: When the crack width is less than 0.1mm, use the pressure grouting method to inject trifluorochloroethylene-vinyl ether into the crack. After the potting glue is cured, clean the surface of the waterproof sealing layer. When the crack width is greater than or equal to 0.1mm, use the surface covering method to repair and apply a flexible epoxy resin adhesive.

[0044] Step 4: Apply waterproof bonding coating: Apply silane-modified polymer sealant evenly on the waterproof sealing layer after crack treatment, with a dosage of 300-500g / m 2 , brush once or brush twice with an interval of 6 hours, and proceed to the next process after the surface is dry;

[0045] Step 5: Repair the base surface with epoxy emulsified modified asphalt repair mortar: Spread the pre-mixed epoxy emulsified asphalt mortar evenly on the construction surface, rake it flat, compact the middle part with a roller, and tamp both sides separately. The thickness of this layer is controlled to be 2 to 2.5 cm.

[0046] Step 6: Apply waterproof bonding layer: Apply silane-modified polymer sealant evenly on the epoxy emulsified asphalt mortar layer at a dosage of 300-500 g / m 2 , brush once or brush twice with an interval of 6 hours, and proceed to the next process after the film is formed;

[0047] Step 7: Apply heat-reflective coating on the surface: Apply unsaturated polyurethane on the waterproof adhesive layer at a dosage of 600-800g / m 2 .

[0048] According to a further improvement of the present invention, when repairing a vertical surface, after applying crack repair material and waterproof adhesive coating, a fixed template ( Figure 2 6), pouring epoxy emulsified modified asphalt repair mortar ( Figure 2 7) and vibrate to make it dense. After the mortar solidifies, remove the formwork and apply joint paste on the joints before proceeding to the next step.

[0049] Example 2: See Figure 3

[0050] A protective layer for treating concrete powderization of a waterproof sealing layer of a high-speed railway subgrade, the protective layer is composed of crack repair materials 1, 2, waterproof bonding coating 3, epoxy repair mortar 4 and heat reflective coating 5. The protective layer is composed of the crack repair materials 1, 2, waterproof bonding coating 3, epoxy emulsified asphalt mortar 4, waterproof bonding coating 3 and heat reflective coating 5 from the inside to the outside. The crack repair material is a flexible epoxy resin adhesive and trifluorochloroethylene-vinyl ether, the waterproof bonding coating is a silane-modified polymer sealant, and the heat reflective coating is an unsaturated polyurethane.

[0051] The epoxy repair mortar is epoxy emulsified asphalt mortar, including stone, mineral powder, water-based epoxy modified emulsified asphalt, cement, and admixtures of certain gradation. The stone is limestone, and the gradation is listed in Table 2. The cement dosage is 1.5%. The modified emulsified asphalt is SBS modified emulsified asphalt, and the dosage is 9.3%. The matrix asphalt is Shuanglong 70#A-grade matrix asphalt, 2.0% emulsifier, 0.2% stabilizer, and 3.5% SBS modifier. The dosage of the water-based epoxy system is 9.3% of the dosage of the modified emulsified asphalt, wherein the dosage of the curing agent is 0.5 times the mass of the water-based epoxy resin. The water dosage is 5%, and the dosage of the mineral powder is 5%. The admixtures include, based on the mass of the epoxy emulsified asphalt mortar, 0.5% of the organosilicon defoamer; based on the mass of the mineral powder, 5% of the fly ash, and 3% of the silica fume.

[0052] The unsaturated polyurethane coating comprises the following raw materials: 60 parts of unsaturated polyurethane, 8 parts of butyl acrylate, 10 parts of methyl methacrylate, 5 parts of coating curing system, 15 parts of TiO2 / SiO2 filler, and 2 parts of pigment filler. The coating curing system is composed of the following raw materials: 2% of cobalt cyclohexane acid and 3% of ethyl ketone peroxide based on the mass of the unsaturated polyurethane coating; the TiO2 / SiO2 filler is composed of the following raw materials: 12 parts of TiO2, 6 parts of SiO2 and 2 parts of hollow microspheres based on the mass of the unsaturated polyurethane.

[0053] The construction method of the protective layer is carried out according to the following steps: (1) Survey of the disease situation; (2) Clean the base surface, mark the crack position, and roughen the surface of the waterproof sealing layer using the well groove method; (3) Apply crack repair material. When the crack width is less than 0.1mm, use the pressure grouting method to inject trifluorochloroethylene-vinyl ether into the crack. After the potting glue is cured, clean the surface of the waterproof sealing layer; when the crack width is greater than or equal to 0.1mm, use the surface covering method to repair and apply a flexible epoxy resin adhesive; (4) Apply the waterproof adhesive coating, with an amount of 400g / m 2 , brush once and then brush the second time after 6 hours, and proceed to the next process after the film is formed; (5) Repair of base surface A. Spread the pre-mixed epoxy emulsified SBS modified asphalt mortar evenly on the construction surface, rake it flat, compact the middle part with a roller, and tamp the two sides separately. The thickness of this layer is controlled at 2.5 cm; (6) Repair of base surface B. Set up a fixed formwork C, with a distance of 2.5 cm between the fixed formwork and base surface B, and the top of the formwork is 2.5 cm higher than the top surface of base surface B, and pour the epoxy emulsified SBS modified asphalt mortar ( Figure 3 (7) Vibrate the mortar between the templates to ensure that the mortar is dense, and remove the template after the mortar solidifies; (7) Apply joint paste ( Figure 3 8) (8) Waterproof bonding layer coating. Apply silane-modified polymer sealant evenly on the epoxy emulsified asphalt mortar layer at a dosage of 500g / m2 , brush once or brush twice with an interval of 6 hours. After the surface is dry, proceed to the next step; (9) Apply heat reflective paint on the surface. Apply unsaturated polyurethane on the waterproof adhesive layer at a dosage of 800g / m 2 .

[0054] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A protective layer for treating powdered concrete in a high-speed railway subgrade waterproof sealing layer, characterized in that: The protective layer is composed of crack repair material, waterproof bonding coating, epoxy emulsified modified asphalt repair mortar and heat reflective coating. From the inside to the outside, the protective layer is composed of the crack repair material, waterproof bonding coating, epoxy repair mortar, waterproof bonding coating and heat reflective coating.

2. The protective layer for treating powdered concrete of a high-speed railway subgrade waterproof sealing layer according to claim 1 is characterized in that: The raw materials of the epoxy emulsified modified asphalt mortar include fixed-graded stone, mineral powder, water-based epoxy emulsified asphalt, and admixtures, wherein the stone is configured according to the recommended stone gradation range table, and the sum of the limestone and sand equivalents is greater than 60%; the epoxy emulsified asphalt is composed of modified asphalt and a water-based epoxy resin system.

3. A protective layer for treating powdered concrete in a high-speed railway subgrade waterproof sealing layer according to claim 2, characterized in that: The modified asphalt is one of SBS modified emulsified asphalt or SBR modified emulsified asphalt; the modified emulsified asphalt comprises: base asphalt, 1.4-2.4 emulsifier, 0.1-0.2% stabilizer, 3-3.5% modifier; the base asphalt is one or more of natural asphalt, petroleum asphalt, tar asphalt and Shuanglong 70#A grade base asphalt.

4. The protective layer for treating powdered concrete of a high-speed railway subgrade waterproof sealing layer according to claim 2 is characterized in that: The amount of the water-based epoxy resin system in the water-based epoxy modified emulsified asphalt is 5-15% of the mass of the modified emulsified asphalt, wherein the amount of the curing agent in the water-based epoxy resin system is 0.5-1.0 times the mass of the water-based epoxy resin; the admixture includes: 0.5-1% of an organosilicon defoamer based on the mass of the epoxy emulsified asphalt mortar; 5% of fly ash and 3% of silica fume based on the mass of the mineral powder.

5. The protective layer for treating powdered concrete of a high-speed railway subgrade waterproof sealing layer according to claim 1 is characterized in that: The crack repair material includes a flexible epoxy resin adhesive and a fluorocarbon coating; the flexible epoxy resin adhesive is used to fill concrete cracks with a width of more than 0.1 mm in the waterproof sealing layer; the fluorocarbon coating is: trifluorochloroethylene-vinyl ether, which is used to seal fine cracks in the concrete on the surface of the waterproof sealing layer with a width of less than 0.1 mm.

6. The protective layer for treating powdered concrete of a high-speed railway subgrade waterproof sealing layer according to claim 1 is characterized in that: The waterproof bonding coating is a silane-modified polymer sealant; the silane-modified polymer sealant is a silane paste or liquid silane.

7. The protective layer for treating powdered concrete of a high-speed railway subgrade waterproof sealing layer according to claim 1 is characterized in that: The heat reflective coating is an unsaturated polyurethane coating, which includes the following raw materials: 60 parts of unsaturated polyurethane, 8 parts of butyl acrylate, 10 parts of methyl methacrylate, 5 parts of coating curing system, 13-15 parts of TiO2 / SiO2 filler, and 2 parts of pigment filler; The coating curing system is composed of the following raw materials: 2% of cobalt cyclopentaneate and 3% of ethyl ketone peroxide, based on the mass of the unsaturated polyurethane coating; the TiO2 / SiO2 filler is composed of the following raw materials: 12 parts of TiO2, 6 parts of SiO2 and 2 parts of hollow microspheres, based on the mass of the unsaturated polyurethane; the color filler is composed of the following raw materials: 0.5% of iron red and 0.8% of iron green, based on the mass of the unsaturated polyurethane coating.

8. The method for constructing a protective layer for treating powdered concrete in a high-speed railway subgrade waterproof sealing layer according to claim 1, characterized in that: The construction method includes the following steps: Step 1: Investigation of damage conditions: Investigate the damage conditions of the concrete cover within the scope of the project, classify them according to powdering, cracking, peeling and strength grade, and keep records and mark them on site, and determine different repair and protection plans for different degrees of damage; Step 2: Clean the base surface: Use a milling machine to clean the powdered layer of the waterproof sealing layer concrete. After removing the loose concrete, use the well groove method to treat the surface concrete of the sealing layer. Finally, use a hair dryer to blow away the cleaned impurities. Step 3, crack repair material application: When the crack width is less than 0.1mm, use the pressure grouting method to inject trifluorochloroethylene-vinyl ether into the crack. After the potting glue is cured, clean the surface of the waterproof sealing layer. When the crack width is greater than or equal to 0.1mm, use the surface covering method to repair and apply a flexible epoxy resin adhesive. Step 4: Apply waterproof bonding coating: Apply silane-modified polymer sealant evenly on the waterproof sealing layer after crack treatment, with a dosage of 300-500g / m 2 , brush once or brush twice with an interval of 6 hours, and proceed to the next process after the surface is dry; Step 5: Repair the base surface with epoxy emulsified modified asphalt repair mortar: Spread the pre-mixed epoxy emulsified asphalt mortar evenly on the construction surface, rake it flat, compact the middle part with a roller, and tamp both sides separately. The thickness of this layer is controlled to be 2 to 2.5 cm. Step 6: Apply waterproof bonding layer: Apply silane-modified polymer sealant evenly on the epoxy emulsified asphalt mortar layer at a dosage of 300-500 g / m 2 , brush once or brush twice with an interval of 6 hours, and proceed to the next process after the film is formed; Step 7: Apply heat-reflective coating on the surface: Apply unsaturated polyurethane on the waterproof adhesive layer at a dosage of 600-800g / m 2 .

9. The method for constructing a protective layer for treating powdered concrete in a high-speed railway subgrade waterproof sealing layer according to claim 8, characterized in that: When repairing vertical surfaces, apply crack repair materials and waterproof adhesive coating, set up a fixed formwork with a distance of 2.5 cm from the vertical surface, pour epoxy emulsified modified asphalt repair mortar, and vibrate it to make it dense. After the mortar solidifies, remove the formwork, apply joint paste on the joints, and then proceed to the next step.

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