High-fill roadbed filler based on weathered granite and preparation method of high-fill roadbed filler

Abstract

The invention relates to the technical field of roadbed fillers, and particularly discloses a high-fill roadbed filler based on weathered granite and a preparation method of the high-fill roadbed filler. The invention relates to a high-fill roadbed filler based on weathered granite. The filler comprises the following raw material components in parts by weight: 60-80 parts of granite waste slag, 10-20 parts of a binder and 5-15 parts of a waterproof agent, the waterproof agent comprises the following raw materials: cement, a silane modified filler, a waterproof reinforcing agent and water. A preparation method of a high-fill subgrade filler based on weathered granite comprises the following steps: firstly, crushing granite waste slag to obtain granite particles with the particle size of 30-50mm, then adding a binder, a waterproof agent and other raw materials into the granite particles, uniformly stirring and mixing to obtain a mixture, finally adding water, controlling the water-cement ratio to be 0.4-0.6, and uniformly mixing to obtain the high-fill subgrade filler based on weathered granite. Stirring and dispersing to obtain the high-fill roadbed filler.

Description

Technical Field

[0001] The present application relates to the technical field of roadbed filling materials, and in particular to a high-fill roadbed filling material based on weathered granite and a preparation method thereof. Background Art

[0002] Granite is an intrusive rock in acidic igneous rocks. It is the most common type of rock in this category. Most of them are light flesh-red, light gray, grayish white, etc. They are medium-coarse-grained and fine-grained structures, blocky structures, and some are mottled structures, spheroidal structures, and gneiss-like structures. The main minerals are quartz, potassium feldspar, and acidic plagioclase, and the secondary minerals are biotite, hornblende, and sometimes a small amount of pyroxene. Normally, a large amount of granite waste will be produced after highway construction. These granite wastes are usually used as roadbed fillers to make rational use of resources. However, the granite roadbed formed has poor erosion resistance and is easily lost when exposed to water, which will cause certain safety hazards to the stability of the slope. Summary of the invention

[0003] In order to improve the water stability of granite roadbed, the present application provides a high fill roadbed filler based on weathered granite and a preparation method thereof.

[0004] In the first aspect, the present application provides a high fill roadbed filler based on weathered granite, which adopts the following technical solution: A high-fill roadbed filler based on weathered granite, wherein the raw materials of the filler include the following components in parts by weight: 60 to 80 parts of granite waste, 10 to 20 parts of a binder, and 5 to 15 parts of a waterproofing agent; the raw materials of the waterproofing agent include cement, a silane-modified filler, a waterproofing enhancer, and water.

[0005] By adopting the above technical scheme, using the combination of cement, silane modified filler and waterproof enhancer, the waterproof agent has better waterproof performance and bonding performance, so that the obtained roadbed filler has both good strength and good water stability, and the obtained granite roadbed has better anti-erosion ability.

[0006] In a specific embodiment, the preparation method of the silane-modified filler comprises the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified solution; The mesoporous silica is stirred and mixed evenly. During the stirring process, the modification liquid is slowly sprayed into the mesoporous silica. After the spraying is completed, the mixture is continuously stirred and dried to obtain a silane-modified filler.

[0007] By adopting the above technical scheme, γ-aminopropyltriethoxysilane is first dissolved in ethanol, stirred and mixed evenly to obtain a modified liquid, and then sprayed on mesoporous silica and dried to complete the modification of the mesoporous silica, thereby improving the dispersion performance of the mesoporous silica. The mesoporous silica has a pore structure and can be used to absorb moisture, and the γ-aminopropyltriethoxysilane on the surface also has a certain bonding effect. By utilizing the hardness of the mesoporous silica itself, the strength of the granite roadbed can be improved.

[0008] In a specific embodiment, the weight ratio of the modified liquid to the mesoporous silica is 1:(13-14).

[0009] By adopting the above technical solution, the ratio of the modified liquid to the mesoporous silica is further limited, and the modification effect of the mesoporous silica can be improved.

[0010] In a specific embodiment, the cement includes blast furnace cement, Portland cement, or a mixture of the two.

[0011] By adopting the above technical solution, blast furnace cement and Portland cement have better durability and better anti-seepage performance, thereby further improving the water stability of roadbed filling materials.

[0012] In a specific embodiment, the waterproof enhancer includes one of polyurethane emulsion and acrylic emulsion, or a mixture of the two.

[0013] By adopting the above technical scheme, polyurethane emulsion and acrylic emulsion can improve the compactness and cohesion of the granite roadbed, thereby further improving the water stability of the granite roadbed.

[0014] In a specific embodiment, the preparation method of the waterproofing agent comprises the following steps: Water, cement, silane modified filler and waterproof enhancer are stirred and mixed uniformly to obtain a waterproof agent, and the weight ratio of water, cement, silane modified filler and waterproof enhancer is 1:(9-10):(1-1.5):(2-2.5).

[0015] By adopting the above technical solution, the ratio of water, cement, silane-modified filler and waterproof enhancer is further limited, so that the performance of the prepared waterproof agent can be further improved.

[0016] In a specific embodiment, the binder includes one or more of cement, lime, and fly ash.

[0017] In a specific embodiment, the raw material of the filler further includes 3 to 5 parts by weight of polypropylene fiber.

[0018] By adopting the above technical solution and adding polypropylene fibers, the strength of the final granite roadbed can be improved.

[0019] In a specific embodiment, the raw material of the filler further includes 0.5 to 1 parts by weight of a preservative, and the preservative includes one or a mixture of sodium benzoate and potassium sorbate.

[0020] By adopting the above technical solution and adding sodium benzoate and potassium sorbate, the service life of the filler can be increased.

[0021] In the second aspect, the present application provides a method for preparing a high fill roadbed filler based on weathered granite, which adopts the following technical solution: A method for preparing a high fill roadbed filler based on weathered granite comprises the following steps: First, the granite slag is crushed to obtain granite particles with a particle size of 30-50mm, and then a binder, a waterproofing agent and other raw materials are added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4-0.6, stirred and dispersed to obtain a high fill roadbed filler.

[0022] By adopting the above technical solution, the granite slag is first crushed, then a binder, a waterproofing agent and other raw materials are added, stirred and mixed evenly, and finally water is added and stirred and dispersed to obtain a high fill roadbed filler with good water stability.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. In this application, the combination of cement, silane-modified filler and waterproof enhancer is used to make the waterproof agent have good waterproof and bonding properties, so that the obtained roadbed filler has both good strength and good water stability, and the obtained granite roadbed has good anti-erosion ability; 2. In the present application, γ-aminopropyltriethoxysilane is first dissolved in ethanol, stirred and mixed evenly to obtain a modified liquid, which is then sprayed on mesoporous silica and dried to complete the modification of the mesoporous silica, thereby improving the dispersion performance of the mesoporous silica. The mesoporous silica has a pore structure and can be used to absorb moisture, and the γ-aminopropyltriethoxysilane on the surface also has a certain bonding effect. The hardness of the mesoporous silica itself can also be used to improve the strength of the granite roadbed; 3. The method of the present application first crushes the granite slag, then adds a binder, a waterproofing agent and other raw materials, stirs and mixes them evenly, and finally adds water, stirs and disperses them to obtain a high fill roadbed filler with good water stability. DETAILED DESCRIPTION

[0024] The present application is further described in detail below with reference to the embodiments.

[0025] All raw materials in the examples are commercially available.

[0026] Preparation Example Preparation Example 1 Preparation Example 1 provides a method for preparing a waterproofing agent, comprising the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified liquid; wherein the weight ratio of γ-aminopropyltriethoxysilane, ethanol and water is 5:18:2; The mesoporous silica was added into a mixer and stirred to be uniformly mixed. During the stirring process, the modified liquid was slowly sprayed into the mesoporous silica. After the spraying was completed, the mixture was stirred for 0.5 h, and then dried at 105° C. for 1 h to obtain a modified filler. The weight ratio of the modified liquid to the mesoporous silica was 1:12.5. Water, cement, silane modified filler and waterproof enhancer are stirred and mixed uniformly to obtain a waterproof agent; wherein the weight ratio of water, cement, silane modified filler and waterproof enhancer is 1:8.5:0.5:1.8; cement is a mixture of blast furnace cement and portland cement, and the weight ratio of blast furnace cement to portland cement is 1:1; the waterproof enhancer includes a mixture of polyurethane emulsion and acrylic emulsion, and the weight ratio of polyurethane emulsion to acrylic emulsion is 1:1.

[0027] Preparation Example 2 The difference between Preparation Example 2 and Preparation Example 1 is that mesoporous silica is added to a mixer and stirred to mix evenly. During the stirring process, the modifying liquid is slowly sprayed into the mesoporous silica. After the spraying is completed, stirring is continued for 0.5 h, and then drying is carried out at 105°C for 1 h to obtain a modified filler; wherein the weight ratio of the modifying liquid to the mesoporous silica is 1:13; and the remaining steps are consistent with Preparation Example 1.

[0028] Preparation Example 3 The difference between Preparation Example 3 and Preparation Example 1 is that mesoporous silica is added to a mixer and stirred to mix evenly. During the stirring process, the modifying liquid is slowly sprayed into the mesoporous silica. After the spraying is completed, stirring is continued for 0.5 h, and then drying is carried out at 105°C for 1 h to obtain a modified filler; wherein the weight ratio of the modifying liquid to the mesoporous silica is 1:13.5; and the remaining steps are consistent with Preparation Example 1.

[0029] Preparation Example 4 The difference between Preparation Example 4 and Preparation Example 1 is that mesoporous silica is added to a mixer and stirred to mix evenly. During the stirring process, the modifying liquid is slowly sprayed into the mesoporous silica. After the spraying is completed, stirring is continued for 0.5 h, and then drying is carried out at 105°C for 1 h to obtain a modified filler; wherein the weight ratio of the modifying liquid to the mesoporous silica is 1:14; and the remaining steps are consistent with Preparation Example 1.

[0030] Preparation Example 5 The difference between Preparation Example 5 and Preparation Example 1 is that mesoporous silica is added to a mixer and stirred to mix evenly. During the stirring process, the modifying liquid is slowly sprayed into the mesoporous silica. After the spraying is completed, stirring is continued for 0.5 h, and then drying is carried out at 105°C for 1 h to obtain a modified filler; wherein the weight ratio of the modifying liquid to the mesoporous silica is 1:14.5; and the remaining steps are consistent with Preparation Example 1.

[0031] Preparation Example 6 The difference between Preparation Example 6 and Preparation Example 3 is that water, cement, silane-modified filler and waterproof enhancer are stirred and mixed evenly to obtain a waterproof agent; wherein the weight ratio of water, cement, silane-modified filler and waterproof enhancer is 1:9:1:2; and the remaining steps are consistent with Preparation Example 3.

[0032] Preparation Example 7 The difference between Preparation Example 7 and Preparation Example 3 is that water, cement, silane-modified filler and waterproof enhancer are stirred and mixed evenly to obtain a waterproof agent; wherein the weight ratio of water, cement, silane-modified filler and waterproof enhancer is 1:9.5:1.2:2.2; and the remaining steps are consistent with Preparation Example 3.

[0033] Preparation Example 8 The difference between Preparation Example 8 and Preparation Example 3 is that water, cement, silane-modified filler and waterproof enhancer are stirred and mixed evenly to obtain a waterproof agent; wherein the weight ratio of water, cement, silane-modified filler and waterproof enhancer is 1:10:1.5:2.5; and the remaining steps are consistent with Preparation Example 3.

[0034] Preparation Example 9 The difference between Preparation Example 9 and Preparation Example 3 is that water, cement, silane-modified filler and waterproof enhancer are stirred and mixed evenly to obtain a waterproof agent; wherein the weight ratio of water, cement, silane-modified filler and waterproof enhancer is 1:10.5:2:2.8; and the remaining steps are consistent with Preparation Example 3.

[0035] Preparation Example 10 Preparation Example 10 provides a method for preparing a waterproofing agent, comprising the following steps: Water, cement and waterproof enhancer are stirred and mixed uniformly to obtain a waterproof agent; wherein the weight ratio of water, cement and waterproof enhancer is 1:8.5:1.8; cement is a mixture of blast furnace cement and portland cement, and the weight ratio of blast furnace cement to portland cement is 1:1; the waterproof enhancer includes a mixture of polyurethane emulsion and acrylic emulsion, and the weight ratio of polyurethane emulsion to acrylic emulsion is 1:1. Example

[0036] Example 1 Example 1 provides a method for preparing a high fill roadbed filler based on weathered granite, comprising the following steps: First, 60 kg of granite slag is crushed to obtain granite particles with a particle size of 30-50 mm, then 10 kg of a binder and 5 kg of the waterproofing agent in Preparation Example 1 are added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, stirred and dispersed to obtain a high fill roadbed filler; wherein the binder is a mixture of cement and fly ash, and the weight ratio of cement to fly ash is 5:1, and the cement is blast furnace cement.

[0037] Example 2 Embodiment 2 provides a method for preparing a high fill roadbed filler based on weathered granite, comprising the following steps: First, 60 kg of granite slag is crushed to obtain granite particles with a particle size of 30-50 mm, then 10 kg of a binder and 5 kg of the waterproofing agent in Preparation Example 2 are added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, stirred and dispersed to obtain a high fill roadbed filler; wherein the binder is a mixture of cement and fly ash, and the weight ratio of cement to fly ash is 5:1, and the cement is blast furnace cement.

[0038] Example 3 Example 3 provides a method for preparing a high fill roadbed filler based on weathered granite, comprising the following steps: First, 60 kg of granite slag is crushed to obtain granite particles with a particle size of 30-50 mm, and then 10 kg of a binder and 5 kg of the waterproofing agent in Preparation Example 3 are added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, stirred and dispersed to obtain a high fill roadbed filler; wherein the binder is a mixture of cement and fly ash, and the weight ratio of cement to fly ash is 5:1, and the cement is blast furnace cement.

[0039] Example 4 Example 4 provides a method for preparing a high fill roadbed filler based on weathered granite, comprising the following steps: First, 60 kg of granite slag is crushed to obtain granite particles with a particle size of 30-50 mm, and then 10 kg of a binder and 5 kg of the waterproofing agent in Preparation Example 4 are added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, stirred and dispersed to obtain a high fill roadbed filler; wherein the binder is a mixture of cement and fly ash, and the weight ratio of cement to fly ash is 5:1, and the cement is blast furnace cement.

[0040] Example 5 Example 5 provides a method for preparing a high fill roadbed filler based on weathered granite, comprising the following steps: First, 60 kg of granite slag is crushed to obtain granite particles with a particle size of 30-50 mm, then 10 kg of a binder and 5 kg of the waterproofing agent in Preparation Example 5 are added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, stirred and dispersed to obtain a high fill roadbed filler; wherein the binder is a mixture of cement and fly ash, and the weight ratio of cement to fly ash is 5:1, and the cement is blast furnace cement.

[0041] Example 6 Example 6 provides a method for preparing a high fill roadbed filler based on weathered granite, comprising the following steps: First, 60 kg of granite slag is crushed to obtain granite particles with a particle size of 30-50 mm, and then 10 kg of a binder and 5 kg of the waterproofing agent in Preparation Example 6 are added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, stirred and dispersed to obtain a high fill roadbed filler; wherein the binder is a mixture of cement and fly ash, and the weight ratio of cement to fly ash is 5:1, and the cement is blast furnace cement.

[0042] Example 7 Example 7 provides a method for preparing a high fill roadbed filler based on weathered granite, comprising the following steps: First, 60 kg of granite slag is crushed to obtain granite particles with a particle size of 30-50 mm, and then 10 kg of a binder and 5 kg of the waterproofing agent in Preparation Example 7 are added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, stirred and dispersed to obtain a high fill roadbed filler; wherein the binder is a mixture of cement and fly ash, and the weight ratio of cement to fly ash is 5:1, and the cement is blast furnace cement.

[0043] Example 8 Example 8 provides a method for preparing a high fill roadbed filler based on weathered granite, comprising the following steps: First, 60 kg of granite slag is crushed to obtain granite particles with a particle size of 30-50 mm, and then 10 kg of a binder and 5 kg of the waterproofing agent in Preparation Example 8 are added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, stirred and dispersed to obtain a high fill roadbed filler; wherein the binder is a mixture of cement and fly ash, and the weight ratio of cement to fly ash is 5:1, and the cement is blast furnace cement.

[0044] Example 9 Example 9 provides a method for preparing a high fill roadbed filler based on weathered granite, comprising the following steps: First, 60 kg of granite slag is crushed to obtain granite particles with a particle size of 30-50 mm, and then 10 kg of a binder and 5 kg of the waterproofing agent in Preparation Example 9 are added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, stirred and dispersed to obtain a high fill roadbed filler; wherein the binder is a mixture of cement and fly ash, and the weight ratio of cement to fly ash is 5:1, and the cement is blast furnace cement.

[0045] Example 10 Embodiment 10 provides a method for preparing a high fill roadbed filler based on weathered granite, comprising the following steps: First, 70 kg of granite slag is crushed to obtain granite particles with a particle size of 30-50 mm, and then 15 kg of a binder and 10 kg of the waterproofing agent in Preparation Example 7 are added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, stirred and dispersed to obtain a high fill roadbed filler; wherein the binder is a mixture of cement and fly ash, and the weight ratio of cement to fly ash is 5:1, and the cement is blast furnace cement.

[0046] Embodiment 11 Example 11 provides a method for preparing a high fill roadbed filler based on weathered granite, comprising the following steps: First, 80 kg of granite slag is crushed to obtain granite particles with a particle size of 30-50 mm, and then 20 kg of a binder and 15 kg of the waterproofing agent in Preparation Example 7 are added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, stirred and dispersed to obtain a high fill roadbed filler; wherein the binder is a mixture of cement and fly ash, and the weight ratio of cement to fly ash is 5:1, and the cement is blast furnace cement.

[0047] Example 12 The difference between Example 12 and Example 10 is that 70 kg of granite slag is first crushed to obtain granite particles with a particle size of 30-50 mm, and then 15 kg of binder, 10 kg of waterproofing agent in Preparation Example 7, and 4 kg of polypropylene fiber are added to the granite particles, and the mixture is stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, and the mixture is stirred and dispersed to obtain a high fill roadbed filler; the remaining steps are consistent with Example 10.

[0048] Embodiment 13 The difference between Example 13 and Example 12 is that 70 kg of granite slag is first crushed to obtain granite particles with a particle size of 30-50 mm, and then 15 kg of binder, 10 kg of waterproofing agent in Preparation Example 7, 4 kg of polypropylene fiber, and 0.8 kg of preservative are added to the granite particles, and the mixture is stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, and the mixture is stirred and dispersed to obtain a high fill roadbed filler; the preservative is sodium benzoate; and the remaining steps are consistent with Example 12.

[0049] Embodiment 14 The difference between Example 14 and Example 13 is that 70 kg of granite slag is first crushed to obtain granite particles with a particle size of 30-50 mm, and then 15 kg of binder, 10 kg of waterproofing agent in Preparation Example 7, 4 kg of polypropylene fiber, and 0.8 kg of preservative are added to the granite particles, and the mixture is stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.5, and the mixture is stirred and dispersed to obtain a high fill roadbed filler; the remaining steps are consistent with Example 13.

[0050] Embodiment 15 The difference between Example 15 and Example 13 is that 70 kg of granite slag is first crushed to obtain granite particles with a particle size of 30-50 mm, and then 15 kg of binder, 10 kg of waterproofing agent in Preparation Example 7, 4 kg of polypropylene fiber, and 0.8 kg of preservative are added to the granite particles, and the mixture is stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.6, and the mixture is stirred and dispersed to obtain a high fill roadbed filler; the remaining steps are consistent with Example 13.

[0051] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that 65 kg of granite slag is first crushed to obtain granite particles with a particle size of 30-50 mm, then 10 kg of binder is added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, stirred and dispersed to obtain a high fill roadbed filler; the remaining steps are consistent with Example 1.

[0052] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that 60 kg of granite slag is first crushed to obtain granite particles with a particle size of 30-50 mm, and then 10 kg of a binder and 5 kg of the waterproofing agent in Preparation Example 10 are added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4, stirred and dispersed to obtain a high fill roadbed filler; the remaining steps are consistent with Example 1.

[0053] Performance test water stability: The high fill roadbed fillers in each embodiment and comparative example are constructed to obtain a granite roadbed, which is then cured for 28 days, and samples are taken to measure the unconfined compressive strength, recorded as a. The samples are then soaked in water for 24 hours, taken out and naturally dried in a ventilated place, soaked for another 24 hours, dried again, and the unconfined compressive strength is measured again, recorded as b. The loss rate c is calculated, c = (ab) / a * 100%. The smaller the loss rate, the higher the water stability of the filler.

[0054] Table 1 Test results of high fill roadbed filling material Combining Example 1 and Comparative Examples 1-2, the water stability of the high fill roadbed filler in Example 1 is the best. It can be seen that when preparing the filler, adding a composite waterproofing agent composed of cement, silane-modified filler and waterproof enhancer to the raw materials can improve the water stability of the high fill roadbed filler.

[0055] Combined with Examples 1-5, the water stability of the high fill roadbed filler in Examples 2-4 is better. It can be seen that when preparing the silane-modified filler, the ratio of the modified liquid to the mesoporous silica is preferably 1:(13-14), and the performance of the obtained silane-modified filler is better.

[0056] In combination with Example 3 and Examples 6-9, the water stability of the high fill roadbed filler in Example 6-8 is better. It can be seen that when preparing the waterproofing agent, the ratio of water, cement, silane modified filler, and waterproofing enhancer is preferably 1: (9-10): (1-1.5): (2-2.5), and the performance of the obtained waterproofing agent is better.

[0057] Combining Example 7, Example 10 and Example 11, the water stability of the high fill roadbed filler in Example 10 is the best. It can be seen that when preparing the filler, increasing the amount of raw materials used, the water stability of the high fill roadbed filler shows a trend of first increasing and then decreasing.

[0058] Combining Example 10 and Example 12, the water stability of the high fill roadbed filler in Example 12 is better. It can be seen that when preparing the filler, adding polypropylene fiber to the raw material can improve the strength of the filler to form a granite roadbed, thereby further improving its water stability.

[0059] Combining Example 12 and Example 13, the water stability of the high fill roadbed fillers in Example 12 and Example 13 is good. It can be seen that when preparing the filler, adding the preservative sodium benzoate to the raw materials can increase the service life of the filler, but has little effect on its water stability.

[0060] In combination with Examples 13-15, the water stability of the high fill roadbed fillers in Examples 13-15 is good. It can be seen that when adding water for mixing, the water-cement ratio is controlled to be 0.4-0.6, and the performance of the obtained filler is better.

[0061] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A high fill roadbed filler based on weathered granite, characterized by: The raw materials of the filler include the following components in parts by weight: 60-80 parts of granite waste, 10-20 parts of binder, and 5-15 parts of waterproofing agent; the raw materials of the waterproofing agent include cement, silane-modified filler, waterproofing enhancer, and water.

2. The high fill roadbed filler based on weathered granite according to claim 1, characterized in that: The preparation method of the silane-modified filler comprises the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified solution; The mesoporous silica is stirred and mixed evenly. During the stirring process, the modification liquid is slowly sprayed into the mesoporous silica. After the spraying is completed, the mixture is continuously stirred and dried to obtain a silane-modified filler.

3. The high fill roadbed filler based on weathered granite according to claim 2, characterized in that: The weight ratio of the modified liquid to the mesoporous silica is 1:(13-14).

4. The high fill roadbed filler based on weathered granite according to claim 2, characterized in that: The cement comprises blast furnace cement, Portland cement or a mixture of the two.

5. The high fill roadbed filler based on weathered granite according to claim 4, characterized in that: The waterproof enhancer comprises one of polyurethane emulsion and acrylic emulsion or a mixture of the two.

6. The high fill roadbed filler based on weathered granite according to claim 5, characterized in that: The preparation method of the waterproofing agent comprises the following steps: Water, cement, silane modified filler and waterproof enhancer are stirred and mixed uniformly to obtain a waterproof agent, and the weight ratio of water, cement, silane modified filler and waterproof enhancer is 1: (9-10): (1-1.5): (2-2.5).

7. The high fill roadbed filler based on weathered granite according to claim 1, characterized in that: The binder includes one or more of cement, lime and fly ash.

8. The high fill roadbed filler based on weathered granite according to claim 1, characterized in that: The raw material of the filler also includes 3 to 5 parts by weight of polypropylene fiber.

9. The high fill roadbed filler based on weathered granite according to claim 1, characterized in that: The raw material of the filler also includes 0.5 to 1 parts by weight of a preservative, and the preservative includes one or a mixture of sodium benzoate and potassium sorbate.

10. A method for preparing a high fill roadbed filler based on weathered granite according to any one of claims 1 to 9, characterized in that: The following steps are involved: First, the granite slag is crushed to obtain granite particles with a particle size of 30-50mm, and then a binder, a waterproofing agent and other raw materials are added to the granite particles, stirred and mixed evenly to obtain a mixture, and finally water is added to control the water-cement ratio to 0.4-0.6, stirred and dispersed to obtain a high fill roadbed filler.

Images