Method for preparing fiber-reinforced composite solidifying agent for reinforcing silt

Abstract

This invention relates to the technical field of silt reinforcement, and discloses a method for preparing a fiber-reinforced composite curing agent for silt reinforcement, comprising the following preparation steps: 1) drying carbide slag and desulfurized gypsum separately; 2) grinding and mixing the dried carbide slag and desulfurized gypsum to form a grinding material; 3) mixing the grinding material with slag, fly ash and glass fiber to form a fiber-reinforced composite curing agent; after being incorporated into the silt, the glass fiber randomly interweaves in the solidified soil to form a three-dimensional network, and the excellent tensile and pull-out properties of the glass fiber itself hinder or delay the deformation and failure of the soil; when the soil is deformed by external force, the glass fiber prevents the development and extension of cracks by exerting interfacial friction, enhances the soil's resistance to deformation, and thus changes the failure mode, solving the problem of brittle failure of silt-reinforced soil.

Description

Technical Field

[0001] This invention relates to the technical field of silt reinforcement, and more specifically, to a method for preparing a fiber-reinforced composite curing agent for silt reinforcement. Background Technology

[0002] After decades of rapid development, coastal cities in my country have gradually extended their urban areas into the ocean. During the construction process, it is unavoidable to deal with silt sites. The silt in coastal areas is mainly composed of fine particles and has characteristics such as high natural water content and compressibility coefficient, large natural porosity and settlement deformation, low shear strength and bearing capacity, and low permeability coefficient, which are very unfavorable for engineering construction.

[0003] Currently, there are three main types of engineering treatment methods for coastal silt: physical treatment, thermal treatment, and chemical treatment.

[0004] Physical treatment involves using various physical methods to drain the pore water from the silt, thereby draining and consolidating the soil and increasing its strength. Common methods include mechanical dewatering and vacuum preloading. Mechanical dewatering equipment is expensive and has a limited processing capacity, while vacuum preloading is a complex process with high engineering costs.

[0005] Heat treatment decomposes the organic matter in the sludge through high-temperature sintering, while also binding the particles together to improve the strength of the sludge. However, this method has strict requirements on the composition of the sludge, has a limited processing capacity, consumes a lot of energy during the sintering process, and cannot avoid carbon emissions.

[0006] Chemical treatment, also known as solidification treatment, is based on the principle of adding chemical materials to sludge and mixing them thoroughly. Through a series of chemical reactions, the soil strength is enhanced. This is currently the most commonly used method for sludge treatment. Solidification treatment has a wide range of applications, controllable strength, convenient construction, and relatively low price, making it a key focus of current sludge treatment research.

[0007] Currently, the most commonly used solidification materials are still traditional cementitious materials such as cement and lime. Using cement and lime to solidify silt can generally meet the strength requirements. However, due to the high water content and small particle size of coastal silt, the treated silt still has defects such as brittle fracture and poor water stability. Once the silt solidified soil experiences brittle fracture or tensile cracks, its strength will decrease rapidly and it will not be able to meet the long-term deformation and stability requirements. Summary of the Invention

[0008] The purpose of this invention is to provide a method for preparing a fiber-reinforced composite curing agent for reinforcing silt, aiming to solve the problem of brittle failure of silt-cured soil in the prior art.

[0009] This invention is achieved through a method for preparing a fiber-reinforced composite curing agent for reinforcing silt, comprising the following preparation steps:

[0010] 1) Dry the carbide slag and desulfurization gypsum separately in the sun;

[0011] 2) Grind and mix the dried carbide slag and desulfurized gypsum to form a grinding material;

[0012] 3) The abrasive is mixed with slag, fly ash and glass fiber to form the fiber-reinforced composite curing agent;

[0013] According to the mass ratio, the fiber-reinforced composite curing agent includes 30%-75% slag, 5%-50% fly ash, 5%-10% carbide slag, 5%-10% desulfurized gypsum, and 0.05%-0.5% glass fiber.

[0014] Furthermore, in the preparation step 2), the slag is an amorphous granular particle, which is formed by rapid air cooling or water cooling of mineral slag. The mineral slag is formed when iron ore, coke and limestone react in a blast furnace and during the deoxygenation process.

[0015] Furthermore, in the preparation step 2), the fly ash is coal powder that remains after cooling and is not completely burned in the flue gas of a thermal power plant.

[0016] Furthermore, in the preparation step 2), the glass fiber is manufactured by hot melting of waste building glass, and the length of the glass fiber is 2mm-6mm.

[0017] Furthermore, in the preparation step 1), the desulfurized gypsum is an industrial byproduct produced by wet lime or limestone-gypsum desulfurization in coal-fired power plants.

[0018] Furthermore, the desulfurized gypsum contains calcium sulfate dihydrate.

[0019] Furthermore, the calcium carbide slag is a product of the calcium carbide hydrolysis reaction for the preparation of acetylene, and the calcium carbide slag contains calcium hydroxide.

[0020] Furthermore, in the preparation step 1), the carbide slag and desulfurized gypsum are placed in a cylindrical dryer for sun drying; the dryer is equipped with a drying cylinder, the interior of which has a closed cavity, and the cavity contains multiple drying nets, which are arranged at intervals along the height direction of the cavity, with drying intervals between adjacent drying nets.

[0021] The drying drum has multiple air outlets in the middle, the drying net has multiple air vents, the top of the drum cavity has a top air inlet, and the bottom of the drum cavity has a bottom air inlet; the drum cavity has a heating structure.

[0022] In preparation step 1), the carbide slag and desulfurized gypsum are spread on multiple drying nets. A top airflow is blown into the top air inlet through an air blowing device, and a bottom airflow is blown into the bottom air inlet through the same device. The top airflow passes through multiple drying nets from top to bottom and is discharged from multiple air outlets. The bottom airflow passes through multiple drying nets from bottom to top and is discharged from multiple air outlets. The heating structure heats the cylinder cavity to form a hot airflow from the top and bottom airflows.

[0023] Furthermore, the outer periphery of the drying interval is formed with an outer peripheral wall, and the heating structure includes a heating tube disposed on the outer peripheral wall. The heating tube is arranged around the outer peripheral wall in a circumferential direction, and along the circumferential direction of the heating tube, the heating tube is arranged in a multi-segment curved shape in the axial direction of the drying interval.

[0024] The outer side of the heating tube is connected to the outer peripheral wall, and a heat insulation pad is provided between the heating tube and the outer peripheral wall. The inner side of the heating tube is arranged towards the middle of the drying interval, and an annular metal sheet extends inward from the inner side of the heating tube. The metal sheet is arranged around the circumference of the drying interval.

[0025] In the preparation step 1), during the process of the top airflow flowing from top to bottom and the bottom airflow flowing from bottom to top, the top airflow and the bottom airflow are blocked and reflected by the metal sheet, forming local reciprocating convection in the cylinder cavity.

[0026] Furthermore, in preparation step 2), the carbide slag and desulfurized gypsum are placed in a conical cylinder and rotated for grinding to form the grinding material; the conical cylinder has a longitudinally arranged conical cavity, the top of the conical cavity has a top opening, and the bottom of the conical cavity has a bottom opening;

[0027] The upper part of the conical cavity has an upper conical ring, which is arranged around the circumference of the conical cavity, and there is an upper grinding gap between the outer wall of the upper conical ring and the inner wall of the conical cavity; the lower part of the conical cavity has a lower conical ring, which is arranged around the circumference of the conical cavity, and there is a lower grinding gap between the outer wall of the lower conical ring and the inner wall of the conical cavity.

[0028] The upper conical ring and the lower conical ring have a middle gap, and a metal mesh layer is provided between the bottom of the upper conical ring and the top of the lower conical ring. The metal mesh layer and the middle gap enclose a deformable annular cavity.

[0029] In preparation step 2), the upper conical ring, the metal mesh layer, and the lower conical ring rotate synchronously in the same direction, and the carbide slag and desulfurized gypsum are placed in the upper grinding gap for preliminary grinding and mixing to form a preliminary mixture. The preliminary mixture falls into the deformed ring cavity for rotation and mixing to form a secondary mixture. The secondary mixture enters the lower grinding gap for further grinding and mixing to form the grinding material.

[0030] Compared with existing technologies, the fiber-reinforced composite curing agent preparation method for reinforcing silt provided by this invention involves glass fibers being incorporated into the silt and randomly interwoven in the solidified soil to form a three-dimensional network. The excellent tensile and pull-out properties of the glass fibers themselves hinder or delay the deformation and failure of the soil. When the soil is deformed by external forces, the glass fibers prevent the development and extension of cracks by exerting interfacial friction, thereby enhancing the soil's resistance to deformation and changing the failure mode, thus solving the problem of brittle failure in silt-solidified soil. Attached Figure Description

[0031] Figure 1 This is a schematic flowchart of the preparation method of the fiber-reinforced composite curing agent for reinforcing silt provided by the present invention;

[0032] Figure 2 This is a cross-sectional schematic diagram of the dryer provided by the present invention;

[0033] Figure 3 This is a cross-sectional schematic diagram of the cone provided by the present invention.

[0034] In the diagram: Dryer 10, Drying drum 20, Heating structure 30, Air blowing device 40, Conical tube 50, Cylinder cavity 21, Drying net 22, Air outlet 23, Drying interval 24, Heating tube 31, Heat insulation pad 32, Metal sheet 33, Conical cavity 51, Upper conical ring 52, Lower conical ring 53, Metal mesh layer 54. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0037] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0038] Reference Figure 1-3 The image shows a preferred embodiment of the present invention.

[0039] A method for preparing a fiber-reinforced composite curing agent for reinforcing silt includes the following preparation steps:

[0040] 1) Dry the carbide slag and desulfurization gypsum separately in the sun;

[0041] 2) Grind and mix the dried carbide slag and desulfurized gypsum to form a grinding material;

[0042] 3) The abrasive is mixed with slag, fly ash and glass fiber to form a fiber-reinforced composite curing agent;

[0043] According to the mass ratio, the fiber-reinforced composite curing agent includes 30%-75% slag, 5%-50% fly ash, 5%-10% carbide slag, 5%-10% desulfurized gypsum, and 0.05%-0.5% glass fiber.

[0044] The above-mentioned method for preparing fiber-reinforced composite curing agent for reinforcing silt involves incorporating glass fibers into the silt to form a three-dimensional network through random interweaving within the solidified soil. The excellent tensile and pull-out properties of the glass fibers themselves hinder or delay the deformation and failure of the soil. When the soil is deformed by external forces, the glass fibers exert interfacial friction to prevent the development and extension of cracks, thereby enhancing the soil's resistance to deformation and changing the failure mode, thus solving the problem of brittle failure in silt-solidified soil.

[0045] In this embodiment, in preparation step 2), the slag is an amorphous granular particle. The amorphous granular particle is formed by rapid air cooling or water cooling of mineral slag. The mineral slag is formed when iron ore, coke and limestone react in a blast furnace and during the deoxygenation process.

[0046] In preparation step 2), fly ash is the coal powder that remains after cooling and is not completely burned in the flue gas of a thermal power plant.

[0047] In preparation step 2), the glass fiber is made by hot melting of waste building glass, and the length of the glass fiber is 2mm-6mm.

[0048] In preparation step 1), the desulfurized gypsum is an industrial byproduct produced by wet lime or limestone-gypsum desulfurization in coal-fired power plants.

[0049] Desulfurized gypsum contains calcium sulfate dihydrate.

[0050] Calcium carbide slag is a product of the hydrolysis reaction of calcium carbide in the preparation of acetylene, and it contains calcium hydroxide.

[0051] The fiber-reinforced composite curing agent is a powdered solid composed of slag, fly ash, carbide slag, desulfurized gypsum, and glass fiber. The proportions of slag powder, fly ash, carbide slag, desulfurized gypsum, and glass fiber are 30-75%, 5-50%, 5-10%, 5-10%, and 0.05-0.5%, with the glass fiber having a length of 2-6 mm. The proportions of each component in the fiber-reinforced composite curing agent are expressed as a mass ratio, i.e., the mixing ratio = mass of each component of the fiber-reinforced composite curing agent / total mass of the fiber-reinforced composite curing agent.

[0052] The main material is mineral powder, which is an industrial waste residue formed during the ironmaking process. It is a mineral slag formed during the deoxygenation process when iron ore, coke, limestone or dolomite react in a blast furnace at about 1500℃. It is formed into amorphous granular particles by rapid air cooling or water cooling. Its chemical composition is similar to that of silicate cement clinker, mainly composed of silicates and aluminates composed of oxides such as CaO, SiO2, Al2O3, and MgO.

[0053] Fly ash is the dust remaining after cooling the flue gas from thermal power plants. It is unburned coal powder, and its main chemical components are SiO2 and Al2O3. Fly ash itself is not active. Under alkaline conditions, due to the addition of alkaline activators, the concentration of OH- in the solution increases. Some of the silicon-oxygen bonds (—Si-O—) and aluminum-oxygen bonds (—Al-O—) in the glass phase of fly ash with better activity break and recombine to form a geopolymer gel.

[0054] Desulfurization gypsum: This is an industrial byproduct mainly composed of CaSO4·2H2O, produced by wet lime / limestone-gypsum desulfurization in coal-fired power plants. It readily decomposes to release Ca. 2+ and SO4 2- Ions, in SO4 2- In environments with high ion concentrations, calcium aluminate hydrate formed from the hydration of mineral powder readily reacts with SO4. 2- They combine to form needle-shaped ettringite; the ettringite crystals are needle-shaped and can effectively fill soil voids. They can also form a spatial network structure in the soil together with the hydration products of mineral powder, thereby greatly enhancing soil stability.

[0055] Carbide slag: It originates from the hydrolysis reaction of carbide used in the preparation of acetylene. Its main component is Ca(OH)2. Conventional disposal methods include landfilling or stockpiling. Its strong alkalinity can pollute soil and groundwater, damaging the ecological environment. Ca(OH)2 can raise the pH of the soil environment, causing the potentially active SiO2 and Al2O3 in mineral powder and fly ash to dissolve. Ultimately, it will generate hydrated calcium silicate and hydrated calcium aluminate colloids, which can effectively fill soil pores and enhance soil strength.

[0056] Glass fiber can be manufactured by hot-melting construction waste glass. Its use can also reduce pollution from waste glass and protect the environment. Glass fiber has the characteristics of high temperature resistance, heat resistance, corrosion resistance, high tensile strength and good processability. Its use can also reduce pollution from waste glass and protect the environment.

[0057] The chemical composition of each component of the silt and fiber-reinforced composite curing agent is shown in the table below:

[0058] Main chemical composition of silt and fiber-reinforced composite curing agent

[0059]

[0060]

[0061] The performance parameters of glass fiber are shown in the table below:

[0062] Main performance parameters of glass fiber

[0063] diameter / μm <![CDATA[Density / g / cm 3 > Tensile strength / MPa <![CDATA[Modulus of elasticity / 10 4 > Appearance pass rate / % 6 2.7 <![CDATA[2.25×10 3 ]]> 7.5～8.5 ≥95

[0064] I. Curing Mechanism

[0065] The strength of solidified soil comes from the chemical reinforcement effect of fiber-reinforced composite solidifying agent and the physical reinforcement effect of fiber; among which, the chemical reinforcement effect includes a series of chemical reactions such as hydration reaction, pozzolanic reaction, fly ash dissociation reaction, and ion adsorption and exchange.

[0066] In this invention, slag and fly ash are the main materials of the fiber-reinforced composite curing agent, while carbide slag and gypsum are the activators. Under the action of the activators, substances such as dicalcium silicate in the fiber-reinforced composite curing agent can quickly react with water in the soil to generate Ca(OH)2 and hydrated calcium silicate (CSH) gel. At the same time, the active SiO2 and Al2O3 inside the slag powder and fly ash are further converted into CS-H and hydrated calcium aluminate (CAH) under the action of alkaline activators and newly generated alkaline substances such as Ca(OH)2. CAH reacts with sulfate activators to generate ettringite (AFt). These products fill the voids inside the soil, increase the soil density, strengthen the connection between soil particles, and adhere to the surface of soil particles, intersecting to form a spatial skeleton and bonding them into a whole, thereby improving the strength of the solidified soil.

[0067] When glass fibers are incorporated into silt, they randomly interweave in the solidified soil to form a three-dimensional network. The excellent tensile and pull-out properties of the glass fibers themselves hinder or delay the deformation and failure of the soil. When the soil is deformed by external forces, the glass fibers prevent the development and extension of cracks by exerting interfacial friction, thereby enhancing the soil's ability to resist deformation and thus changing the failure mode.

[0068] In this embodiment, in preparation step 1), carbide slag and desulfurized gypsum are placed in a cylindrical dryer 10 for sun drying; the dryer 10 is provided with a drying cylinder 20, the interior of the drying cylinder 20 has a closed cylinder cavity 21, the cylinder cavity 21 has multiple drying nets 22, the multiple drying nets 22 are arranged at intervals along the height direction of the cylinder cavity 21, and there is a drying interval 24 between adjacent drying nets 22.

[0069] The drying drum 20 has multiple air outlets 23 in the middle, the drying net 22 has multiple air vents, the top of the drum cavity 21 has a top air inlet, and the bottom of the drum cavity 21 has a bottom air inlet; the drum cavity 21 has a heating structure 30.

[0070] In preparation step 1), carbide slag and desulfurized gypsum are spread on multiple drying nets 22. A top airflow is blown into the top air inlet through the air blowing device 40, and a bottom airflow is blown into the bottom air inlet through the air blowing device 40. The top airflow passes through multiple drying nets 22 from top to bottom and is discharged from multiple air outlets 23. The bottom airflow passes through multiple drying nets 22 from bottom to top and is discharged from multiple air outlets 23. The heating structure 30 heats the cylinder cavity 21 so that the top airflow and the bottom airflow form a hot airflow.

[0071] The dryer 10 can simultaneously dry carbide slag and desulfurized gypsum through multiple drying nets 22 in the drying drum 20. Airflow is blown into the drum cavity 21 in the drying drum 20 by the air blowing device 40, and then the drum cavity 21 is heated by the heating structure 30, so that the airflow at the top and bottom forms a hot airflow. The hot airflow quickly removes the moisture from the carbide slag and desulfurized gypsum, thereby improving the drying efficiency.

[0072] In this embodiment, an outer peripheral wall is formed on the outer periphery of the drying interval 24, and the heating structure 30 includes a heating tube 31 disposed on the outer peripheral wall. The heating tube 31 is arranged around the outer peripheral wall in a circumferential manner. Along the circumferential direction of the heating tube 31, the heating tube 31 is arranged in a multi-segment curved shape in the axial direction of the drying interval 24.

[0073] The outer side of the heating tube 31 is connected to the outer peripheral wall, and a heat insulation pad 32 is provided between the heating tube 31 and the outer peripheral wall. The inner side of the heating tube 31 is arranged towards the middle of the drying interval 24. A ring-shaped metal sheet 33 extends inward from the inner side of the heating tube 31. The metal sheet 33 is arranged around the circumference of the drying interval 24.

[0074] In preparation step 1), as the top airflow flows from top to bottom and the bottom airflow flows from bottom to top, the top airflow and the bottom airflow are blocked and reflected by the metal sheet 33, forming local reciprocating convection in the cylinder cavity 21.

[0075] The heating structure 30 increases its heating area by using multiple curved heating tubes 31. The drying drum 20 uses a heat insulation pad 32 to retain the heat of the heating tubes 31 in the drum cavity 21, thereby improving heat utilization. The heating tubes 31 use metal sheets 33 to block and reflect the airflow at the top and bottom, creating local reciprocating convection in the drum cavity 21, which improves heat utilization and further accelerates the drying efficiency.

[0076] In this embodiment, in preparation step 2), carbide slag and desulfurized gypsum are placed in a cone 50 and rotated for grinding to form abrasive material; the cone 50 has a longitudinally arranged cone cavity 51, the top of the cone cavity 51 has a top opening, and the bottom of the cone cavity 51 has a bottom opening;

[0077] The upper part of the conical cavity 51 has an upper conical ring 52, which is arranged around the circumference of the conical cavity 51. There is an upper grinding gap between the outer wall of the upper conical ring 52 and the inner wall of the conical cavity 51. The lower part of the conical cavity 51 has a lower conical ring 53, which is arranged around the circumference of the conical cavity 51. There is a lower grinding gap between the outer wall of the lower conical ring 53 and the inner wall of the conical cavity 51.

[0078] There is a middle gap between the upper conical ring 52 and the lower conical ring 53. A metal mesh layer 54 is provided between the bottom of the upper conical ring 52 and the top of the lower conical ring 53. The metal mesh layer 54 and the middle gap form a deformable annular cavity.

[0079] In preparation step 2), the upper conical ring 52, the metal mesh layer 54, and the lower conical ring 53 rotate synchronously in the same direction. The carbide slag and desulfurized gypsum are placed in the upper grinding gap for preliminary grinding and mixing to form a preliminary mixture. The preliminary mixture falls into the deformed ring cavity for rotation and mixing to form a secondary mixture. The secondary mixture enters the lower grinding gap for further grinding and mixing to form a grinding material.

[0080] The cone 50, through the top opening of the cone cavity 51, feeds carbide slag and desulfurized gypsum from top to bottom into the upper grinding gap. Utilizing the synchronous rotation of the upper cone ring 52, the metal mesh layer 54, and the lower cone ring 53, the outer wall of the upper cone ring 52 and the inner wall of the cone cavity 51 grind and mix the carbide slag and desulfurized gypsum in the upper grinding gap to form a preliminary mixture. The preliminary mixture falls into the deformable ring cavity for rotational mixing. After elastic mixing in the deformable ring cavity, it falls into the lower grinding gap, where the outer wall of the lower cone ring 53 and the inner wall of the cone cavity 51 grind and mix the preliminary mixture in the lower grinding gap again to form an abrasive.

[0081] The method of using the fiber-reinforced composite curing agent of this invention to reinforce silt sites is as follows:

[0082] 1) Divide the site to be constructed into solidification areas with a length and width of 5-6m;

[0083] 2) Set up the grouting backstage, which mainly includes storage tank, mixer, grout storage cylinder, grouting pump, and grouting pipeline;

[0084] 3) Prepare the fiber-reinforced composite curing agent into a curing slurry in a mixing tank according to the designed water-cement ratio, and add glass fiber according to the designed admixture amount. The mixing speed of the mixing tank is 60-120 rpm, and the mixing time of each bucket of curing slurry is 1-2 minutes. After the mixing is completed, put the curing slurry into the storage tank. The mixing speed of the storage tank is controlled at 30-60 rpm.

[0085] 4) Check the connection of the main mixer system, the installation and trial adjustment of each part of the hydraulic system, electrical system and powder spraying system, and check whether the sealing connection of the ash hopper and conveying pipeline of the automatic material supply in the background is normal. Make the corresponding adjustments and tighten the seals. After eliminating all abnormalities, the mixing can be started.

[0086] 5) The sludge solidification is carried out by solidifying and advancing simultaneously. The mixing is done vertically. The mixing head is first inserted directly into the bottom of the sludge solidification design while rotating forward. When the sludge completely covers the connecting rod of the mixing head, the solidification slurry is sprayed. At this time, the mixing equipment rotates in reverse and slowly lifts and sprays the solidification slurry. To ensure the reinforcement effect, the lifting and lowering actions need to be repeated 2-3 times for each mixing. The lifting or lowering rate of the mixing is controlled at 10-15 s / m, and the spraying rate of the solidification slurry is controlled at 80-150 kg / min.

[0087] 6) The initial setting time of the silt after solidification is 4-6 hours, and the final setting time is 10-15 hours. Its strength after 1 day can reach 0.2-0.3 MPa. It can harden to the point that it does not turn into mud when exposed to water. The compressive strength after 3 days is greater than 0.5 MPa, and the strength after 28 days is 2-4 MPa. Compared with the strength without fiber, the strength can be increased by about 1.5 times, which is more than 3 times the strength of cement reinforcement. The higher early strength can ensure the efficiency of subsequent processes, shorten the construction period, and save project costs.

[0088] Beneficial effects achieved: The fiber-reinforced composite curing agent is low in cost, low in carbon emissions, environmentally friendly, and pollution-free. The raw materials used in this fiber-reinforced composite curing agent, such as slag, fly ash, desulfurized gypsum, and carbide slag, are all industrial by-products, thus reducing material costs and turning waste into treasure. The fiber-reinforced composite curing agent fully utilizes the reinforcing effect of fibers, greatly improving the strength of the cured soil. The fiber-reinforced composite curing agent has high early strength, which can accelerate the construction progress of subsequent processes, shorten the construction period, and save costs.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a fiber-reinforced composite solidifying agent for reinforcing silt, characterized by, The preparation steps include the following: 1) Dry the carbide slag and desulfurization gypsum separately in the sun; The carbide slag and desulfurized gypsum are placed in a cylindrical dryer for sun drying; the dryer is equipped with a drying cylinder, the interior of which has a closed cavity, and the cavity contains multiple drying nets, which are arranged at intervals along the height of the cavity, with drying intervals between adjacent drying nets. The drying drum has multiple air outlets in the middle, the drying net has multiple air vents, the top of the drum cavity has a top air inlet, and the bottom of the drum cavity has a bottom air inlet; the drum cavity has a heating structure. The carbide slag and desulfurized gypsum are spread on multiple drying nets. A top airflow is blown into the top air inlet through an air blowing device, and a bottom airflow is blown into the bottom air inlet through the same device. The top airflow passes through the multiple drying nets from top to bottom and is discharged from multiple air outlets. The bottom airflow passes through the multiple drying nets from bottom to top and is discharged from multiple air outlets. The heating structure heats the cylinder cavity to form a hot airflow from the top and bottom airflows. The drying interval has an outer peripheral wall, and the heating structure includes a heating tube disposed on the outer peripheral wall. The heating tube is arranged around the outer peripheral wall in a circumferential manner, and along the circumferential direction of the heating tube, the heating tube is arranged in a multi-segment curved shape in the axial direction of the drying interval. The outer side of the heating tube is connected to the outer peripheral wall, and a heat insulation pad is provided between the heating tube and the outer peripheral wall. The inner side of the heating tube is arranged towards the middle of the drying interval, and an annular metal sheet extends inward from the inner side of the heating tube. The metal sheet is arranged around the circumference of the drying interval. During the process of the top airflow flowing from top to bottom and the bottom airflow flowing from bottom to top, the top airflow and the bottom airflow are blocked and reflected by the metal sheet, forming local reciprocating convection in the cylinder cavity; 2) Grind and mix the dried carbide slag and desulfurized gypsum to form a grinding material; The carbide slag and desulfurized gypsum are placed in a conical cylinder and rotated for grinding to form the grinding material; The cone has a longitudinally arranged conical cavity, the top of the conical cavity has a top opening, and the bottom of the conical cavity has a bottom opening; The upper part of the conical cavity has an upper conical ring, which is arranged around the circumference of the conical cavity, and there is an upper grinding gap between the outer wall of the upper conical ring and the inner wall of the conical cavity; the lower part of the conical cavity has a lower conical ring, which is arranged around the circumference of the conical cavity, and there is a lower grinding gap between the outer wall of the lower conical ring and the inner wall of the conical cavity. The upper conical ring and the lower conical ring have a middle gap, and a metal mesh layer is provided between the bottom of the upper conical ring and the top of the lower conical ring. The metal mesh layer and the middle gap enclose a deformable annular cavity. The upper conical ring, the metal mesh layer, and the lower conical ring rotate synchronously in the same direction, placing the carbide slag and desulfurized gypsum in the upper grinding gap for preliminary grinding and mixing to form a preliminary mixture. The preliminary mixture falls into the deformed ring cavity for rotation and mixing to form a secondary mixture. The secondary mixture enters the lower grinding gap for further grinding and mixing to form the grinding material. 3) The abrasive is mixed with slag, fly ash and glass fiber to form the fiber-reinforced composite curing agent; According to the mass ratio, the fiber-reinforced composite curing agent includes 30%-75% slag, 5%-50% fly ash, 5%-10% carbide slag, 5%-10% desulfurized gypsum, and 0.05%-0.5% glass fiber.

2. The method for preparing the fiber-reinforced composite curing agent for reinforcing silt as described in claim 1, characterized in that, In preparation step 3), the slag is an amorphous granular particle, which is formed by rapid air cooling or water cooling of mineral slag. The mineral slag is formed when iron ore, coke and limestone react in a blast furnace and during the deoxygenation process.

3. The method for preparing the fiber-reinforced composite curing agent for reinforcing silt as described in claim 2, characterized in that, In preparation step 3), the fly ash is coal powder that remains after cooling and is not completely burned in the flue gas of a thermal power plant.

4. The method for preparing the fiber-reinforced composite curing agent for reinforcing silt as described in claim 3, characterized in that, In preparation step 3), the glass fiber is manufactured by hot melting of waste building glass, and the length of the glass fiber is 2mm-6mm.

5. The method for preparing the fiber-reinforced composite curing agent for reinforcing silt as described in claim 4, characterized in that, In preparation step 1), the desulfurized gypsum is an industrial byproduct produced by wet lime or limestone-gypsum desulfurization in coal-fired power plants.

6. The method for preparing the fiber-reinforced composite curing agent for reinforcing silt as described in claim 5, characterized in that, The desulfurized gypsum contains calcium sulfate dihydrate.

7. The method for preparing the fiber-reinforced composite curing agent for reinforcing silt as described in claim 6, characterized in that, The calcium carbide slag is a product of the calcium carbide hydrolysis reaction for the preparation of acetylene, and the calcium carbide slag contains calcium hydroxide.

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