Fiber modified muck recycling slurry and preparation method thereof

Abstract

The invention discloses fiber modified muck recycling slurry and a preparation method thereof.The fiber modified muck recycling slurry is prepared from, by weight, 50-60 parts of muck, 7-15 parts of cement, 12-17 parts of fly ash, 0.1-0.5 part of fiber materials and 25-30 parts of water, the muck comes from a bottom layer with the high content of fine-particle soil, the water content is not lower than 20%, when the water content of the muck is insufficient, water is additionally added, and when the water content of the muck is not enough, the fiber materials are recycled; the cement is one of ordinary Portland cement or composite Portland cement, the strength grade is not lower than 42.5 R, the fiber material is glass fiber, the fiber length is not lower than 6 mm, consumption of muck is increased, the site muck containing burden is effectively relieved, and meanwhile the fiber material is added for modification, so that the compression resistance, shear strength and crack resistance of the slurry are improved.

Description

Technical Field

[0001] The invention relates to a fiber-modified slag recycling slurry and a preparation method thereof. Background Art

[0002] The patent application number is "201811123171.8". In a method for recycling and reusing shield slag, the slag is screened step by step to separate particles such as mud and gravel, and then the chemical composition is analyzed. The optimal moisture content and maximum dry density of the soil sample are obtained through indoor compaction tests. Then, according to the experimental results, a suitable soil solidifier is selected for a mix ratio test, and the slag is harmlessly treated. However, its process flow is relatively complicated, and the measurement accuracy of the indoor compaction test will be affected by factors such as the sample preparation process, compaction work, moisture content, residual soil height, and compaction standard selection. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a fiber-modified slag recycling slurry and a preparation method thereof, which increases the consumption of slag and effectively alleviates the burden of on-site slag accommodation. At the same time, fiber material modification is added to improve the slurry's compressive, shear strength and crack resistance.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a fiber-modified slag recycling slurry, comprising the following components in parts by weight: 50-60 parts of slag, 7-15 parts of cement, 12-17 parts of fly ash, 0.1-0.5 parts of fiber material, and 25-30 parts of water. The slag comes from a bottom layer with a high content of fine-grained soil, and has a moisture content of not less than 20%. When the moisture content of the slag is insufficient, water is added.

[0005] Furthermore, the cement is one of ordinary silicate cement or composite silicate cement, and the strength grade is not less than 42.5R.

[0006] Furthermore, the fly ash adopts primary or secondary fly ash.

[0007] Furthermore, the fiber material is glass fiber, and the fiber length is not less than 6 mm.

[0008] The present invention also provides a method for preparing a fiber-modified slag recycling slurry, comprising the following steps:

[0009] (1) Measure soil moisture content ω

[0010] The specific gravity of the slag is measured by a hydrometer. s The density of pure water at 4°C is ρω1, which is 1g / cm3 or 1t / m3. The density of the slag is ρ. The dry density of the slag is known, and the calculation formula is: The moisture content of the slag soil can be quickly calculated, and the moisture content of the slag soil is not less than 20%;

[0013] (2) Forming Slurry A

[0014] According to the moisture content of the slag, weigh the required amount of slag and water respectively, add them to the reuse mud pool, mix them evenly through the stirring equipment for not less than 3 minutes, and form mud A;

[0015] (3) Formation of slurry B

[0016] Weigh the required amount of glass fiber according to the ratio, add it into the mud A by manual feeding, stir evenly for not less than 1 minute to form mud B, and pump the mud B from the reuse mud pool into the forced mixing equipment;

[0017] (4) Forming fiber-modified slag recycling slurry

[0018] Add slurry B into the forced mixing equipment, then weigh the required amount of cement and fly ash according to the ratio, add the cement and fly ash into the forced mixing equipment, mix and stir for 1 minute to form a slurry.

[0019] Or (1) measure the soil moisture content ω

[0020] The specific gravity of the slag is measured by a hydrometer. The density of pure water at 4°C is ρω1, which is 1g / cm3 or 1t / m3. The density of the slag is ρ. If the dry density of the slag is known, the moisture content of the slag can be quickly calculated according to the calculation formula. The moisture content of the slag is not less than 20%.

[0021] (2) Forming Slurry A

[0022] According to the moisture content of the slag, weigh the required amount of slag and water respectively, add them into the slurry generation system, mix them evenly, and stir them for no less than 3 minutes to form slurry A;

[0023] (3) Formation of slurry B

[0024] Weigh the required amount of glass fiber according to the ratio, add it into the slurry generation system, and stir it evenly for not less than 1 minute to form slurry B;

[0025] (4) Forming fiber-modified slag recycling slurry

[0026] Weigh the required amount of cement and fly ash according to the ratio, add them into the slurry generation system, mix with mud B and stir for 1 min to form slurry.

[0027] Furthermore, the slurry generating system includes a multi-stage stirring mechanism, which includes a first-stage stirring component, a second-stage stirring component and a third-stage stirring component. The feed port of the second-stage stirring component is the discharge port of the first-stage stirring component, the discharge port of the second-stage stirring component is the feed port of the third-stage stirring component, and both the discharge port and the feed port of the second-stage stirring component are provided with opening and closing parts. The first-stage stirring component is used to generate mud A, the second-stage stirring component is used to generate mud B, and the third-stage stirring component is used to generate fiber-modified slag recycling slurry.

[0028] Furthermore, the first-stage stirring assembly and the third stirring assembly both include a stirring drum, in which a first stirring assembly is arranged, and the first stirring assembly both include a bracket arranged on the stirring drum, a fixed gear disc is provided on the bracket, the fixed gear disc is meshed with a rotating gear disc, the rotating gear disc is connected to a rotating plate, a rotating shaft is provided at the end of the rotating plate and passes through the center of the fixed gear disc to be connected to a motor, the rotating gear disc is connected to a driving rod, a spherical universal joint is provided at the end of the driving rod, a telescopic scraper is provided on the outer end surface of the driving rod, the spherical universal joint is connected to a stirring rod, and a stirring plate is provided on the outer end surface of the stirring rod, the spherical universal joint is spherically connected to the limit seat of the bracket, and the rotating plate is rotated by the motor to realize the self-rotation of the driving rod and the circular motion at the same time.

[0029] Furthermore, the second-stage stirring assembly includes a stirring box and a second stirring assembly, the second stirring assembly includes a guide track provided in the middle of the upper end of the stirring box, a left movable plate and a right movable plate are provided on the guide track, the left movable plate and the right movable plate are connected to the bidirectional threaded rod, sliding plates are provided on the sides of the movable plates, and telescopic plates are provided at the ends of the sliding plates for sliding connection with the inner wall of the stirring box, a stirring rod is provided at the lower end of the sliding plate, a stirring plate is provided on the outer end surface of the stirring rod, and a spacing adjustment member is provided between the sliding plates in the same longitudinal direction, and the spacing adjustment member is used to adjust the spacing between the stirring rods.

[0030] Furthermore, the first-stage stirring assembly, the second-stage stirring assembly and the third-stage stirring assembly are all configured with material adding parts.

[0031] Beneficial effects:

[0032] 1. This application uses slag to completely replace bentonite and yellow sand, uses cement and fly ash as cementing materials, adds a certain proportion of fiber materials to improve the strength and crack resistance of slag recycling slurry, increases the consumption of slag, effectively alleviates the burden of slag accommodation on site, and effectively improves environmental and economic benefits; and can be directly used as synchronous grouting for shield construction to fill the gaps between shield segments and strata.

[0033] 2. This application focuses on solving the problem that the recycled material formed by using cement as a curing agent for slag is insufficient in strength and easy to crack, and simplifies the existing operating steps for slag recycling, making the preparation of fiber-modified slag recycling slurry simple, and can directly utilize the moisture in the slag, thereby reducing the amount of mixing water, and the engineering economy is high.

[0034] 3. By adding fiber materials to the cement-based slag recycling slurry for modification, the slurry's compressive strength, shear strength and crack resistance can be improved to a certain extent, ensuring the construction safety and engineering quality of the shield synchronous grouting.

[0035] 4. The present application adopts the special component ratio, and under the synergistic effect of each component, the apparent density of the fiber-modified slag recycling slurry is greater than or equal to 1800kg / m 3 , the slump is 12cm~16cm, and the 28d cube compressive strength is greater than or equal to 0.3MPa, which meets the engineering technical indicators of synchronous grouting in shield construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the process for preparing fiber-modified slag recycling slurry;

[0037] Figure 2 is a schematic diagram of the grouting generation system;

[0038] Figure 3 This is a schematic diagram of the interior of the first type of mixing drum;

[0039] Figure 4 This is a schematic diagram of the interior of the second mixing drum;

[0040] Figure 5 This is a schematic diagram of the interior of the mixing box;

[0041] Figure 6 for Figure 5 A partial enlarged schematic diagram of part A in the middle.

[0042] Figure numerals: 1. first-stage stirring assembly; 2. second-stage stirring assembly; 3. third-stage stirring assembly; 4. opening and closing member; 5. stirring drum; 6. first stirring assembly; 7. fixed toothed disc; 8. rotating toothed disc; 9. rotating plate; 10. stirring rod; 11. stirring plate; 12. second stirring assembly; 121. guide rail; 122. left movable plate; 123. right movable plate; 124. bidirectional threaded rod; 125. sliding plate; 126. telescopic plate; 13. spacing adjustment member; 14. telescopic scraper; 15. material adding member; 16. stirring box. DETAILED DESCRIPTION

[0043] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0044] Refer to Figure 1 As shown, the present application provides a fiber-modified slag recycling slurry, comprising the following components by weight: 50-60 parts of slag, 7-15 parts of cement, 12-17 parts of fly ash, 0.1-0.5 parts of fiber material, and 25-30 parts of water. The slag comes from a bottom layer with a high content of fine particles, and the moisture content is not less than 20%. When the moisture content of the slag is insufficient, water is added. The cement is one of ordinary silicate cement or composite silicate cement, and the strength grade is not less than 42.5R. The fly ash uses first-grade or second-grade fly ash. The fiber material is glass fiber, and the fiber length is not less than 6 mm.

[0045] The specific proportion parameters are preferably: including slag, cement, fly ash, fiber material and water as raw materials, uniformly mixed and stirred, and the mass ratio of each raw material is 50.3 parts of slag, 9.6 parts of cement, 14.1 parts of fly ash, 0.2 parts of fiber material and 25.9 parts of water.

[0046] Refer to Figure 1 As shown, the present application also provides a method for preparing a fiber-modified slag recycling slurry, comprising the following steps:

[0047] (1) Measure soil moisture content ω

[0048] The specific gravity of the slag is measured by a hydrometer. The density of pure water at 4°C is ρω1, which is 1g / cm3 or 1t / m3. The density of the slag is ρ. The dry density of the slag is known, and the calculation formula is: The moisture content of the slag soil can be quickly calculated, and the moisture content of the slag soil is not less than 20%;

[0049] (2) Forming Slurry A

[0050] According to the moisture content of the slag, weigh the required amount of slag and water respectively, add them to the reuse mud pool, and use a stirring device to mix and stir evenly for no less than 3 minutes to form mud A;

[0051] (3) Formation of slurry B

[0052] Weigh the required amount of glass fiber according to the ratio, add it into the mud A by manual feeding, stir evenly for not less than 1 minute, and form mud B. Pump mud B from the reuse mud pool into the forced mixing equipment;

[0053] (4) Forming fiber-modified slag recycling slurry

[0054] Add slurry B into the forced mixing equipment, then weigh the required amount of cement and fly ash according to the ratio, add the cement and fly ash into the forced mixing equipment, mix and stir for 1 minute to form a slurry.

[0055] Refer to Figure 2-5 As shown, the present application also provides a second preparation method, which is basically the same as the first preparation method mentioned above, with the only difference being that a slurry generation system is used to make a fiber-modified slag recycling slurry, so that all steps are realized in one system and the slurry preparation efficiency is improved, and uniform stirring is achieved in each stirring step. The specific slurry generating system includes a multi-stage stirring mechanism, which includes a first-stage stirring component 1, a second-stage stirring component 2 and a third-stage stirring component 3. The feed port of the second-stage stirring component 2 is the storage port of the first-stage stirring component 1, and the discharge port of the second-stage stirring component 2 is the feed port of the third-stage stirring component 3. The discharge port and the feed port of the second-stage stirring component 2 are both provided with an opening and closing member 4, which is a motor-driven valve, thereby controlling the circulation between the stirring components. The first-stage stirring component 1 is used to generate mud A, the second-stage stirring component 2 is used to generate mud B, and the third-stage stirring component 3 is used to generate fiber-modified slag recycling slurry. The first-stage stirring component 1 and the second-stage stirring component 2 both include a stirring drum 5. The end of the stirring drum of the first-stage stirring component 1 is inclined to facilitate the smooth flow of the mud A in the first-stage stirring component 1 to the stirring box 16 of the second-stage stirring component 2. The end of the stirring drum of the third-stage stirring component 3 is conical and the discharge port is arranged at the bottom.

[0056] like Figure 2 , Figure 3 As shown, the first stirring assembly 1 and the third stirring assembly 3 are both provided with a first stirring assembly 6 in the stirring drum 5. The first stirring assembly 6 includes a bracket arranged on the stirring drum 5, a fixed toothed disc 7 is provided on the bracket, and the fixed toothed disc 7 is meshed with a rotating toothed disc 8. The rotating toothed disc 8 is connected to a rotating plate 9. A rotating shaft is provided at the end of the rotating plate 9 and passes through the center of the fixed toothed disc 7 to connect to the motor. The rotating toothed disc 8 is connected to a driving rod, and a ball universal joint is provided at the end of the driving rod. The ball universal joint is connected to a stirring rod 10. A stirring plate 11 is provided on the outer end surface of the stirring rod 10. The ball universal joint is spherically connected to the limit seat of the bracket. A telescopic scraper 14 is sleeved on the outer end surface of the driving rod. The telescopic scraper 14 includes a transverse telescopic rod clamped on the driving rod and a scraper is provided at the end of the transverse telescopic rod. The transverse telescopic rod is sleeved with a telescopic spring. When the motor is started, the connecting plate makes a circular motion with the rotating gear. While making a circular motion, the rotating toothed disc 8 is meshed with the fixed toothed disc 7, so that the rotating toothed disc 8 rotates with the driving rod and the stirring plate rod, thereby realizing uniform stirring between the materials. The first stirring assembly 6 is not limited to the above structure, and may also be configured as follows: Figure 4As shown, a fixed gear disc 7 is provided, and two sets of rotating gear discs 8 are meshed with the fixed gear disc 7. The two sets of rotating gears are connected to a rotating plate 9. The rotating plates 9 are connected to the driving rod of the motor. A lower stirring rod 10 is vertically connected to the driving rod. An upper stirring rod 10 is connected to the rotating gear disc 8. Both the upper stirring rod 10 and the lower stirring rod 10 are provided with stirring plates 11.

[0057] like Figure 5 , Figure 6 As shown, the second-stage stirring assembly 2 includes a stirring box 16 and a second stirring assembly 12. The second stirring assembly 12 includes a guide track 121 provided in the middle of the upper end of the stirring box 16. A left movable plate 122 and a right movable plate 123 are provided on the guide track 121. The left movable plate 122 and the right movable plate 123 are connected to a bidirectional threaded rod 124. The bidirectional threaded rod 124 is configured with a motor drive. Sliding plates 125 are provided on the sides of the movable plates. Telescopic plates 126 are provided at the ends of the sliding plates 125 to be slidably connected to the inner wall of the stirring box 16. Springs are provided between the sliding plates 125, the telescopic plates 126 and the movable plates to facilitate telescopic expansion. A stirring rod 10 is provided at the lower end of the sliding plate 125, and a stirring plate 11 is provided on the outer end surface of the stirring rod 10. A spacing adjustment member 13 is provided between the sliding plates 125 in the same longitudinal direction. The spacing adjustment member 13 includes a V-shaped hinged rod provided between the sliding plates 125 in the same longitudinal direction, and the movable plate is provided with an inverted U-shaped limit frame corresponding to the V-shaped hinged rod. The V-shaped hinged rod is arranged in the limit frame and an adjustment rod is provided on the limit frame. A telescopic spring is provided at the lower end of the V-shaped hinged rod, and the adjustment rod is configured with a drive. When the spacing needs to be adjusted, the adjustment rod is started to press down the V-shaped hinged rod, thereby pushing the sliding plate 1 25 can be longitudinally slipped to realize stirring at different positions in the mixing box 16. Due to the existence of the spacing adjustment member 13, the stirring rods 10 on the sliding plate 125 are each individually equipped with a motor, or the left and right movable plates 123 are laterally extended to form a T-shaped plate, and a sliding sprocket is provided at the transverse raised end, and a sprocket is provided at the upper end of the stirring rod 10 between the longitudinal sliding plates 125, and a chain is provided between the sprocket and the sliding sprocket, one of the sprockets is equipped with a motor, and the motor drives the rotation of the sprocket to drive the other stirring rod 10 to rotate through the chain, and the change of the sliding sprocket is used to adapt to the change of the spacing adjustment member 13.

[0058] The first-stage stirring component 1, the second-stage stirring component 2 and the third-stage stirring component 3 are all equipped with material adding parts 15. The first-stage stirring component 1 needs to add water and slag, and the second-stage stirring component 2 needs to add glass fiber. The material adding part 15 of the second-stage stirring component 2 cooperates with the second stirring component 12. When the left and right movable plates 123 move laterally, cement and fly ash need to be added through the third-stage stirring component 3, and the materials are transported to the corresponding stirring components through the material adding part 15. Since the material adding part 15 is a prior art, it will not be elaborated here.

[0059] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A fiber-modified slag recycling slurry, characterized in that: The invention comprises the following components in parts by weight: 50-60 parts of slag, 7-15 parts of cement, 12-17 parts of fly ash, 0.1-0.5 parts of fiber material and 25-30 parts of water. The slag comes from a bottom layer with a high content of fine-grained soil and has a moisture content of not less than 20%. When the moisture content of the slag is insufficient, water is added.

2. The fiber-modified slag recycling slurry according to claim 1, characterized in that: The cement is one of ordinary silicate cement or composite silicate cement, and the strength grade is not less than 42.5R.

3. The fiber-modified slag recycling slurry according to claim 2, characterized in that: The fly ash adopts primary or secondary fly ash.

4. The fiber-modified slag recycling slurry according to claim 3, characterized in that: The fiber material is glass fiber and the fiber length is not less than 6mm.

5. The method for preparing the fiber-modified slag recycling slurry according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) Measure soil moisture content ω The specific gravity of the slag is measured by a hydrometer. s The density of pure water at 4°C is ρω1, which is 1g / cm3 or 1t / m3, so the density of slag is ω=ρ-1 Degree ρ, known soil dry density ρd, according to the calculation formula ρ d The moisture content of the slag soil can be quickly calculated, and the moisture content of the slag soil is not less than 20%; (2) Forming Slurry A According to the moisture content of the slag, weigh the required amount of slag and water respectively, add them to the reuse mud pool, mix and stir evenly for no less than 3 minutes to form mud A; (3) Formation of slurry B Weigh the required amount of glass fiber according to the ratio, add it into the mud A by manual feeding, stir evenly for not less than 1 minute to form mud B, and pump the mud B from the reuse mud pool into the forced mixing equipment; (4) Forming fiber-modified slag recycling slurry Add slurry B into the forced mixing equipment, then weigh the required amount of cement and fly ash according to the ratio, add the cement and fly ash into the forced mixing equipment, mix and stir for 1 minute to form a slurry.

6. The method for preparing the fiber-modified slag recycling slurry according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) Measure soil moisture content ω The specific gravity of the slag is measured by a hydrometer. s The density of pure water at 4°C is ρω1, which is 1g / cm3 or 1t / m3, so the density of slag is ω=ρ-1 Degree ρ, known soil dry density ρd, according to the calculation formula ρd, the soil moisture content can be quickly calculated. The soil moisture content is not less than 20%; (2) Forming Slurry A According to the moisture content of the slag, weigh the required amount of slag and water respectively, add them into the slurry generation system, and use a stirring device to mix and stir evenly for no less than 3 minutes to form slurry A; (3) Formation of slurry B Weigh the required amount of glass fiber according to the ratio, add it into the slurry generation system, and stir it evenly for at least 1 minute to form slurry B; (4) Forming fiber-modified slag recycling slurry Weigh the required amount of cement and fly ash according to the ratio, add them into the slurry generation system, mix with mud B and stir for 1 minute to form slurry.

7. The method for preparing fiber-modified slag recycling slurry according to claim 6, characterized in that: The slurry generating system comprises a multi-stage stirring mechanism, which comprises a first-stage stirring assembly, a second-stage stirring assembly and a third-stage stirring assembly, the feed port of the second-stage stirring assembly is the discharge port of the first-stage stirring assembly, the discharge port of the second-stage stirring assembly is the feed port of the third-stage stirring assembly, the discharge port and the feed port of the second-stage stirring assembly are both provided with opening and closing parts, the first-stage stirring assembly is used to generate mud A, the second-stage stirring assembly is used to generate mud B, and the third-stage stirring assembly is used to generate fiber-modified slag recycling slurry.

8. The method for preparing fiber-modified slag recycling slurry according to claim 7, characterized in that: The first-stage stirring assembly and the third-stage stirring assembly both include a stirring drum, a first stirring assembly is arranged in the stirring drum, and the first stirring assembly both include a bracket arranged on the stirring drum, a fixed toothed disc is provided on the bracket, the fixed toothed disc is meshed with a rotating toothed disc, the rotating toothed disc is connected to a rotating plate, a rotating shaft is provided at the end of the rotating plate and passes through the center of the fixed toothed disc to be connected to a motor, the rotating toothed disc is connected to a driving rod, a ball universal joint is provided at the end of the driving rod, a telescopic scraper is provided on the outer end surface of the driving rod, the ball universal joint is connected to a stirring rod, and a stirring plate is provided on the outer end surface of the stirring rod, the ball universal joint is spherically connected to the limit seat of the bracket, and the rotating plate is rotated by the motor to realize the self-rotation of the driving rod and the circular motion at the same time.

9. The method for preparing fiber-modified slag recycling slurry according to claim 8, characterized in that: The second-stage stirring assembly includes a stirring box and a second stirring assembly, the second stirring assembly includes a guide track provided in the middle of the upper end of the stirring box, a left movable plate and a right movable plate are provided on the guide track, the left movable plate and the right movable plate are connected to the bidirectional threaded rod, sliding plates are provided on the sides of the movable plates, and telescopic plates are provided at the ends of the sliding plates for sliding connection with the inner wall of the stirring box, a stirring rod is provided at the lower end of the sliding plate, a stirring plate is provided on the outer end surface of the stirring rod, and a spacing adjustment member is provided between the sliding plates in the same longitudinal direction, and the spacing adjustment member is used to adjust the spacing between the stirring rods.

10. The method for preparing fiber-modified slag recycling slurry according to claim 9, characterized in that: The first-stage stirring assembly, the second-stage stirring assembly and the third-stage stirring assembly are all equipped with material adding parts.

Images