Homologous isomeric alkali residue-based fluidized solidified soil and preparation method and application thereof

Abstract

The application provides a homologous heterogeneous alkali residue-based fluid-state solidified soil and a preparation method and application thereof, and belongs to the technical field of solid waste resource utilization. The alkali residue-based solidified agent is prepared by using the pressure-filtered alkali residue, slag, desulfurization ash, fly ash and cement. The high-water-content paste-shaped original alkali residue, desalted solid salt alkali residue and slag are used as the alkali residue-based matrix soil. The homologous heterogeneous alkali residue has different structures and forms, which can be used as the matrix soil and can be used to prepare the solidified agent, promotes and improves the physicochemical reaction and particle size matching among different components, and thus improves the mechanical properties of the homologous heterogeneous alkali residue-based fluid-state solidified soil. The flowability of the homologous heterogeneous alkali residue-based fluid-state solidified soil can be adjusted by adding a proper amount of water and water reducing agent, the construction demand can be met, and the homologous heterogeneous alkali residue-based fluid-state solidified soil has excellent compacting performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solid waste resource utilization, and particularly relates to a homogenous heterogeneous alkali residue-based fluidized solidified soil and a preparation method and application thereof. BACKGROUND

[0002] Offshore pile foundations are widely used in offshore wind power, cross-sea bridges, port terminals, offshore oil platforms and other engineering projects. However, due to the particularity of the marine environment, offshore pile foundations are subjected to the scouring action of tides, waves and the deposition and erosion of marine silt for a long time, which can easily lead to a decrease in the stability and bearing capacity of offshore pile foundations. This seriously affects the safety and service life of offshore facilities. Traditional methods for reinforcing offshore pile foundations include concrete reinforcement and sleeve-type protective structures. However, these methods generally have problems such as complex construction, high cost, insufficient environmental adaptability and difficult maintenance, and are difficult to meet the needs of marine engineering for efficient, economical and sustainable anti-scouring technologies.

[0003] Fluidized solidified soil is a material with self-leveling, self-compacting, controllable strength and widely available raw materials. The self-leveling and self-compacting properties of fluidized solidified soil make it suitable for underwater construction and irregular terrain, which not only effectively improves the construction efficiency, but also reduces the engineering cost. Therefore, fluidized solidified soil has great application potential in the fields of reinforcing offshore pile foundations and underwater filling.

[0004] The ammonia-alkali method is the main process for industrial production of soda ash, which is widely used in glass manufacturing, chemical industry, food industry, pharmaceutical industry and other industries. However, the traditional disposal methods of landfill and storage not only result in low utilization rate of alkali residue (≤5%), but also cause certain impact on the surrounding environment (soil salinization, dust pollution, etc.). Alkali residue has high calcium content, fine particle size, high pH value and high activity, and can be used to prepare fluidized solidified soil. However, there are different forms of alkali residue in the alkali residue storage yard, including high-moisture paste-like raw alkali residue, filter-pressed alkali residue with a certain moisture content, and alkali residue after desalination and salt fixation. These alkali residues are all waste residues produced after the production of soda ash by the ammonia-alkali method, and have homology. However, due to the differences in treatment process and method, their physical and chemical structures are different, and thus they have heterogeneity. These alkali residues are called homogenous heterogeneous alkali residues. Using these alkali residues to prepare homogenous heterogeneous alkali residue-based fluidized solidified soil has application prospects in replacing or partially replacing traditional offshore pile anti-scouring protection engineering. However, due to the differences in the properties of homogenous heterogeneous alkali residues, it is currently difficult to directly use homogenous heterogeneous alkali residues in offshore pile anti-scouring protection engineering. SUMMARY

[0005] The application aims to provide a homologous and isomeric alkali residue-based fluid solidified soil and a preparation method and application thereof.

[0006] In order to achieve the above-mentioned application purposes, the application provides the following technical solutions.

[0007] The application provides a homologous and isomeric alkali residue-based fluid solidified soil, wherein the fluidity of the homologous and isomeric alkali residue-based fluid solidified soil is 170-400 mm.

[0008] The homologous and isomeric alkali residue-based fluid solidified soil comprises the following components: alkali residue-based matrix soil, alkali residue-based solidified agent, water reducing agent and water; the mass ratio of the alkali residue-based matrix soil and the alkali residue-based solidified agent is 100: (10-30).

[0009] According to the mass percentage of the alkali residue-based matrix soil being 100%, the components of the alkali residue-based matrix soil comprise: 40-50% of paste-shaped original alkali residue, 20-30% of desalted and solidified alkali residue and 20-40% of slag.

[0010] According to the mass percentage of the alkali residue-based solidified agent being 100%, the components of the alkali residue-based solidified agent comprise: 25-40% of pressure-filtered alkali residue, 35-50% of slag, 10-15% of desulfurized ash, 10-15% of fly ash and 10-15% of cement.

[0011] Preferably, the water content of the paste-shaped original alkali residue is greater than or equal to 200%.

[0012] Preferably, the particle size of the desalted and solidified alkali residue is less than or equal to 5 mm.

[0013] Preferably, the water content of the pressure-filtered alkali residue is less than or equal to 50%.

[0014] Preferably, the slag comprises water-quenched blast furnace slag.

[0015] Preferably, the fly ash is first-grade fly ash.

[0016] Preferably, the specific surface area of the alkali residue-based solidified agent is 300-400 m 2 / kg, and the fineness is not less than 5% of the amount of square hole sieve residue of 45 μm.

[0017] The application further provides a preparation method of the homologous and isomeric alkali residue-based fluid solidified soil.

[0018] The paste-shaped original alkali residue, the desalted and solidified alkali residue and the slag are mixed to obtain the alkali residue-based matrix soil.

[0019] The pressure-filtered alkali residue, the slag, the desulfurized ash, the fly ash and the cement are mixed to obtain the alkali residue-based solidified agent.

[0020] Mixing the alkali residue-based matrix soil, the alkali residue-based curing agent, the water reducing agent and water to obtain the alkali residue-based isomeric fluid curing soil.

[0021] The application also provides the use of the alkali residue-based isomeric fluid curing soil in the anti-scouring protection pile.

[0022] Preferably, the method of use comprises: pumping the alkali residue-based isomeric fluid curing soil to the base pile root of the anti-scouring protection pile, and forming a protective layer after hardening around the base pile root.

[0023] The application provides an alkali residue-based isomeric fluid curing soil, the fluidity of the alkali residue-based isomeric fluid curing soil being 170-400 mm; the alkali residue-based isomeric fluid curing soil comprises the following components: alkali residue-based matrix soil, alkali residue-based curing agent, water reducing agent and water; the mass ratio of the alkali residue-based matrix soil and the alkali residue-based curing agent being 100: (10-30); according to the mass percentage of the alkali residue-based matrix soil being 100%, the components of the alkali residue-based matrix soil comprise: 40-50% of paste original alkali residue, 20-30% of alkali residue after desalination and solidification and 20-40% of slag; according to the mass percentage of the alkali residue-based curing agent being 100%, the components of the alkali residue-based curing agent comprise: 25-40% of alkali residue after pressure filtration, 35-50% of slag, 10-15% of desulfurized ash, 10-15% of fly ash and 10-15% of cement. The application prepares the alkali residue-based curing agent and the alkali residue-based matrix soil by using different forms and structures of the isomeric alkali residue from the same source, and forms the fluid curing soil by using the alkali residue-based curing agent and the alkali residue-based matrix soil. The application prepares the alkali residue-based curing agent by using the alkali residue after pressure filtration, slag, desulfurized ash, fly ash and cement. The application uses the paste original alkali residue, the alkali residue after desalination and solidification and the slag as the alkali residue-based matrix soil. The application uses the isomeric alkali residue with different structures and forms, which can be used as the matrix soil and can be used to prepare the curing agent, promotes and improves the physicochemical reaction and particle size matching between different components, thereby improving the mechanical properties of the isomeric alkali residue-based fluid curing soil. The application can adjust the fluidity of the isomeric alkali residue-based fluid curing soil by adding an appropriate amount of water and water reducing agent, can meet the needs of construction and has excellent compacting performance. The results of the examples show that the 28d compressive strength of the isomeric alkali residue-based fluid curing soil provided by the application is 3.4 MPa or more, and has high strength and stability. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Picture of the isomeric alkali residue used for the examples of the application;

[0025] Figure 2 A schematic diagram for application of the isomeric alkali residue-based fluid-solidified soil in the embodiments of the present application;

[0026] Figure 3 A picture of a wind power single-pile foundation scouring prevention scale model test of the isomeric alkali residue-based fluid-solidified soil in Embodiment 1 of the present application. DETAILED DESCRIPTION

[0027] The present application provides an isomeric alkali residue-based fluid-solidified soil, the fluidity of the isomeric alkali residue-based fluid-solidified soil being 170-400 mm.

[0028] The isomeric alkali residue-based fluid-solidified soil comprises the following components: alkali residue-based matrix soil, alkali residue-based solidifying agent, water reducing agent and water; the mass ratio of the alkali residue-based matrix soil and the alkali residue-based solidifying agent being 100: (10-30).

[0029] The components of the alkali residue-based matrix soil, based on the mass percentage of the alkali residue-based matrix soil being 100%, comprise: 40-50% of paste-like original alkali residue, 20-30% of alkali residue after desalination and solid salt removal, and 20-40% of slag.

[0030] The components of the alkali residue-based solidifying agent, based on the mass percentage of the alkali residue-based solidifying agent being 100%, comprise: 25-40% of alkali residue after pressure filtration, 35-50% of slag, 10-15% of desulfurized ash, 10-15% of fly ash, and 10-15% of cement.

[0031] In the present application, the fluidity of the isomeric alkali residue-based fluid-solidified soil is 170-400 mm. As an embodiment of the present application, the fluidity of the isomeric alkali residue-based fluid-solidified soil can be 170 mm, 200 mm, 250 mm, 300 mm or 350 mm. The present application controls the fluidity of the isomeric alkali residue-based fluid-solidified soil in the above range, has good fluidity, can improve the pouring efficiency, and is beneficial to filling the target space, reducing the defects such as voids, honeycombs and pitted surface, and ensuring the compactness and continuity of filling.

[0032] The isomeric alkali residue-based fluid-solidified soil provided by the present application comprises the following components: alkali residue-based matrix soil, alkali residue-based solidifying agent, water reducing agent and water.

[0033] In the present application, the mass ratio of the alkali residue-based matrix soil and the alkali residue-based solidifying agent is 100: (10-30), preferably 100: (15-20).

[0034] The present application does not have special limitations on the amount of water, which is adjusted as needed so that the fluidity of the isomeric alkali residue-based fluid-solidified soil reaches 170-400 mm.

[0035] The homomeric alkali residue-based fluid-solidified soil provided by the present application comprises an alkali residue-based matrix soil.

[0036] The alkali residue-based matrix soil comprises 40-50% of paste-like original alkali residue, based on 100% of the mass percentage of the alkali residue-based matrix soil. As an embodiment of the present application, the mass percentage of the paste-like original alkali residue can be 40%, 42%, 45%, 48% or 50%.

[0037] In the present application, the water content of the paste-like original alkali residue is preferably ≥200%. The present application does not have special limitations on the source of the paste-like original alkali residue, and a conventional paste-like original alkali residue can be used. In the embodiments of the present application, the paste-like original alkali residue can be liquid waste residue produced after the preparation of sodium carbonate by the ammonia-soda method, which is directly discharged into an alkali residue pool, and the paste-like original alkali residue is obtained after natural sedimentation and evaporation. The paste-like original alkali residue used in the present application has a high water content, which can reduce the amount of water used. In the embodiments of the present application, the source of the paste-like original alkali residue can be the alkali residue yard of Zhonghe Ecological Environment Co., Ltd., and the main components of the paste-like original alkali residue include calcium carbonate, calcium sulfate, calcium hydroxide, sodium salt and magnesium salt.

[0038] In the embodiments of the present application, the picture of the paste-like original alkali residue is preferably as shown in Figure 1 (a).

[0039] The alkali residue-based matrix soil comprises 20-30% of desalted and solidified alkali residue, based on 100% of the mass percentage of the alkali residue-based matrix soil. As an embodiment of the present application, the mass percentage of the desalted and solidified alkali residue can be 20%, 22%, 25%, 26%, 28% or 30%. The use of desalted and solidified alkali residue in the present application can promote the pozzolanic reaction, and the mass percentage of the desalted and solidified alkali residue is controlled in the above range, which can improve the strength of the homomeric alkali residue-based fluid-solidified soil after solidification.

[0040] In the present application, the particle size of the desalted and solidified alkali residue is preferably ≤5 mm, and more preferably ≤3 mm. The particle size of the desalted and solidified alkali residue is controlled in the above range in the present application, which can form a gradation with other particles of the homomeric alkali residue-based fluid-solidified soil, and improve the strength of the homomeric alkali residue-based fluid-solidified soil after solidification. In the embodiments of the present application, the picture of the desalted and solidified alkali residue is preferably as shown in Figure 1 (c).

[0041] The present application does not have special limitations on the source of the desalted and solidified alkali residue, and the desalted and solidified alkali residue known to those skilled in the art can be used, and the desalted and solidified alkali residue is homomeric alkali residue with the paste-like original alkali residue described in the above technical solution. In the embodiments of the present application, the desalted and solidified alkali residue is preferably from Lianyungang Zhonghe Ecological Environment Co., Ltd.

[0042] The alkali residue-based base soil includes 20-40% of the slag, based on 100% of the mass percentage of the alkali residue-based base soil. As an embodiment of the present application, the mass percentage of the slag can be 20%, 22%, 25%, 30%, 35%, or 40%. The present application uses the slag to promote the pozzolanic reaction, and the mass percentage of the slag is controlled in the above range to improve the strength of the isomeric alkali residue-based fluidified soil after curing. The present application does not have a special limitation on the source of the slag, and a conventional slag can be used. In the embodiment of the present application, the source of the slag can be the ash discharged from the bottom of a boiler after burning coal.

[0043] In the present application, the fineness of the slag is preferably 15 μm square hole sieve residue > 45%, and the particle size is ≤ 5 mm.

[0044] The isomeric alkali residue-based fluidified soil provided by the present application includes an alkali residue-based curing agent.

[0045] In the present application, the components of the alkali residue-based curing agent include 25-40% of the alkali residue after pressure filtration, based on 100% of the mass percentage of the alkali residue-based curing agent.

[0046] In the present application, the components of the alkali residue-based curing agent include 25-40% of the alkali residue after pressure filtration, based on 100% of the mass percentage of the alkali residue-based curing agent. As an embodiment of the present application, the mass percentage of the alkali residue after pressure filtration can be 25%, 30%, 32%, 35%, 36%, 38%, or 40%. The present application adds the alkali residue after pressure filtration, which has a low water content, to promote the curing of the alkali residue-based base soil. In the embodiment of the present application, the picture of the alkali residue after pressure filtration is preferably as shown in (b). Figure 1

[0047] In the present application, the water content of the alkali residue after pressure filtration is preferably ≤ 50%, and more preferably ≤ 40%.

[0048] In the present application, the preparation method of the alkali residue after pressure filtration preferably includes reducing the water content in the paste-like original alkali residue to ≤ 50%. The present application does not have a special limitation on the method of reducing the water content, and a conventional pressure filtration method can be used.

[0049] In the present application, the particle size of the alkali residue after pressure filtration is preferably ≤ 1 mm, and more preferably ≤ 0.5 mm.

[0050] In the present application, the components of the alkali residue-based curing agent include 35-50% of the slag, based on 100% of the mass percentage of the alkali residue-based curing agent. As an embodiment of the present application, the mass percentage of the slag can be 35%, 40%, 42%, 45%, 46%, 48%, or 50%. The present application adds the slag to promote the pozzolanic reaction.​

[0051] In the present application, the slag is preferably water quenched blast furnace slag, and the model of the water quenched blast furnace slag can be S95. In the embodiment of the present application, the chemical composition of the water quenched blast furnace slag preferably comprises CaO 35.325%, SiO2 30.985%, Al2O3 17.519% and MgO 10.364%.

[0052] In the present application, the component of the alkali slag based solidifying agent comprises 10-15% of desulfurization ash, based on the mass percentage of the alkali slag based solidifying agent being 100%. As an embodiment of the present application, the mass percentage of the desulfurization ash can be 10%, 11%, 12%, 13%, 14% or 15%. The present application can improve the long-term strength of the isomeric alkali slag based fluidified solidified soil after solidification by adding desulfurization ash. The present application does not have special limitation on the source of the desulfurization ash, and the conventional desulfurization ash can be used.

[0053] In the present application, the component of the alkali slag based solidifying agent comprises 10-15% of fly ash, based on the mass percentage of the alkali slag based solidifying agent being 100%. As an embodiment of the present application, the mass percentage of the fly ash can be 10%, 11%, 12%, 13%, 14% or 15%. In the present application, the fly ash is preferably primary fly ash. The present application can promote the pozzolanic reaction and improve the strength of the isomeric alkali slag based fluidified solidified soil after solidification by adding primary fly ash.

[0054] In the present application, the specific surface area of the alkali slag based solidifying agent is preferably 300-400 m 2 / kg, and more preferably 350-400 m 2 / kg. In the present application, the fineness of the alkali slag based solidifying agent is preferably not less than 5%

[0055] The isomeric alkali slag based fluidified solidified soil provided by the present application comprises a water reducing agent. In the present application, the water reducing agent is preferably a polycarboxylic acid high-efficiency liquid water reducing agent, and the model of the polycarboxylic acid high-efficiency liquid water reducing agent can be FED-1S polycarboxylic acid high-performance water reducing agent (standard type).

[0056] In the present application, the cement is preferably 42.5 ordinary portland cement. The present application can improve the cementitious property and early strength of the isomeric alkali slag based fluidified solidified soil by adding cement.

[0057] The present application also provides a preparation method of the isomeric alkali slag based fluidified solidified soil described in the above technical solution, comprising the following steps:

[0058] Mixing the paste-like original alkali slag, the desalted solid salt alkali slag and the slag to obtain an alkali slag based matrix soil;

[0059] mixing the alkali residue-based matrix soil, the alkali residue-based curing agent, a water reducing agent and water to obtain the isomeric alkali residue-based fluid curing soil.

[0060] mixing the alkali residue-based matrix soil, the alkali residue-based curing agent, a water reducing agent and water to obtain the isomeric alkali residue-based fluid curing soil.

[0061] The alkali residue-based matrix soil is obtained by mixing the paste-like original alkali residue, the desalted and solidified alkali residue and the slag.

[0062] The alkali residue-based curing agent is obtained by mixing the alkali residue after pressure filtration, the slag, the desulfurization ash, the fly ash and the cement.

[0063] The method for mixing the alkali residue after pressure filtration, the slag, the desulfurization ash, the fly ash and the cement is not particularly limited, and the mixture is only required to be uniform.

[0064] The isomeric alkali residue-based fluid curing soil is obtained by mixing the alkali residue-based matrix soil, the alkali residue-based curing agent, a water reducing agent and water.

[0065] In the present application, the method for mixing the alkali residue-based matrix soil, the alkali residue-based curing agent, a water reducing agent and water is preferably stirring, the stirring speed can be 70-90 r / min, more preferably 80-90 r / min, and the stirring time can be 3-4 min.

[0066] The alkali residue-based matrix soil, the alkali residue-based curing agent, water and a water reducing agent are mixed to adjust the fluidity of the isomeric alkali residue-based fluid curing soil.

[0067] The present application also provides the use of the isomeric alkali residue-based fluid curing soil in the anti-scouring protective pile.

[0068] In the present application, the method preferably comprises pumping the isomeric alkali residue-based fluid curing soil to the base pile root of the anti-scouring protective pile, and hardening the isomeric alkali residue-based fluid curing soil around the base pile root to form a protective layer.

[0069] The amount of the isomeric alkali residue-based fluid curing soil is not particularly limited, and can be adjusted according to the need to form the protective layer outside the base pile root.

[0070] In this invention, the method for forming the protective layer preferably includes feather protection, flatbed protection, wing protection, or bottom protection.

[0071] This invention does not specifically limit the curing conditions, as long as the homologous heterogeneous alkali slag-based fluidized solidified soil is completely cured. In embodiments of this invention, the curing can involve a first curing and a second curing, wherein the temperature for the first and second curing is independently preferably 20±5℃; and the humidity for the first and second curing is independently preferably 95±5%. In embodiments of this invention, the first curing time can be 1 day. This invention achieves final shaping through the first curing. In embodiments of this invention, the second curing time can be 3~28 days. This invention enables the homologous heterogeneous alkali slag-based fluidized solidified soil to be fully cured through the second curing.

[0072] The present invention, when cured under the above conditions, enables the homologous and heterogeneous alkali slag-based fluidized solidified soil to be fully solidified.

[0073] In this invention, the preferred schematic diagram of the application of the homologous isomorphic alkali slag-based fluidized solidified soil is as follows: Figure 2 As shown. From Figure 2 As can be seen, the experimental procedure of the present invention is as follows: using alkali residue after filter pressing, slag, desulfurization ash, fly ash and cement as alkali residue-based solidifying agents; using paste-like original alkali residue, desalinated and solidified alkali residue and slag as matrix soil, mixing evenly, adding water-reducing agent and water and stirring evenly, conducting flowability tests, and then molding and curing (i.e. molding and demolding, curing in a standard curing room).

[0074] The homologous and heterogeneous alkali slag-based fluidized solidified soil provided by this invention is conducive to promoting the high-value utilization of alkali slag, reducing the environmental impact of alkali slag storage, and effectively realizing dense casting in marine environments.

[0075] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0076] Example 1

[0077] A homologous heterogeneous alkali slag-based fluidized solidified soil, wherein the fluidity of the homologous heterogeneous alkali slag-based fluidized solidified soil is 300 mm;

[0078] The components of the homologous and heterogeneous alkaline slag-based fluidized solidified soil are: alkaline slag-based matrix soil, alkaline slag-based solidifying agent, water-reducing agent (FED-1S polycarboxylate high-performance water-reducing agent (standard type)) and water; the mass ratio of the alkaline slag-based matrix soil to the alkaline slag-based solidifying agent is 100:10.

[0079] The components of the alkali residue-based matrix soil, in terms of 100% of the mass percentage of the alkali residue-based matrix soil, are: 50% of the paste-like original alkali residue with a water content of ≥200%, 30% of the alkali residue after desalination and solidification (particle size ≤5 mm), and 20% of the slag.

[0080] The components of the alkali residue-based solidifying agent, in terms of 100% of the mass percentage of the alkali residue-based solidifying agent, are: 30% of the alkali residue after pressure filtration (particle size ≤5 mm, water content of 40%), 40% of the slag (S95), 10% of the desulfurized ash, 10% of the first-grade fly ash, and 10% of the cement.

[0081] The preparation method of the isomeric alkali residue-based fluid-solidified soil is as follows:

[0082] The paste-like original alkali residue, the alkali residue after desalination and solidification, and the slag are mixed to obtain the alkali residue-based matrix soil.

[0083] The alkali residue after pressure filtration, the slag, the desulfurized ash, the first-grade fly ash, and the cement are mixed to obtain the alkali residue-based solidifying agent.

[0084] The alkali residue-based matrix soil and the alkali residue-based solidifying agent are stirred at 90 r / min for 3 min, water is added to the mixture according to the flow degree index, the water is added to a basic flow degree of 170 mm, a polycarboxylic acid high-efficiency liquid water reducing agent is added in an amount of 0.5-1.0% of the dry alkali residue-based solidifying agent, the flow degree is adjusted to 300 mm, and stirring is performed for 2 min to obtain the isomeric alkali residue-based fluid-solidified soil.

[0085] Application Example 1

[0086] A wind power single-pile foundation anti-scouring protection reduced-scale model is prepared in the laboratory to simulate the application of the isomeric alkali residue-based fluid-solidified soil in the anti-scouring protection pile: the isomeric alkali residue-based fluid-solidified soil prepared in Example 1 is layered and filled into a mold, and is fully vibrated and tamped until the voids are completely discharged (i.e., the vibration is compacted), the test block is coated and placed in a standard curing room (temperature: 20±5℃, humidity: 95±5%) for curing. After one day, the test block is demolded and placed in a standard curing room (temperature: 20±5℃, humidity: 95±5%) for curing for 3d, 7d, and 28d, respectively, and finally the compressive strength is tested. The compressive strengths of 3d, 7d, and 28d are 0.62 MPa, 1.05 MPa, and 3.4 MPa, respectively.

[0087] Table 1 Test results of the isomeric alkali residue-based fluid-solidified soil prepared in Example 1

[0088]

[0089] Example 2

[0090] A homomeric alkali residue-based fluid-state solidified soil, the fluidity of the homomeric alkali residue-based fluid-state solidified soil is 260 mm;

[0091] The components of the homomeric alkali residue-based fluid-state solidified soil are: alkali residue-based matrix soil, alkali residue-based solidified agent, water reducing agent (FED-1S polycarboxylic acid high-performance water reducing agent (standard type)), and water; the mass ratio of the alkali residue-based matrix soil and the alkali residue-based solidified agent is 100:15;

[0092] According to the mass percentage content of the alkali residue-based matrix soil being 100%, the components of the alkali residue-based matrix soil are: 40% of paste-shaped original alkali residue with a water content of ≥200%, 30% of alkali residue after desalination and solidification of salt (particle size ≤5 mm), and 30% of slag;

[0093] According to the mass percentage content of the alkali residue-based solidified agent being 100%, the components of the alkali residue-based solidified agent are: 30% of alkali residue after pressure filtration (particle size ≤5 mm, water content of 40%), 35% of slag (S95), 10% of desulfurization ash, 10% of first-grade fly ash, and 15% of cement.

[0094] The preparation method of the homomeric alkali residue-based fluid-state solidified soil is:

[0095] The paste-shaped original alkali residue, the alkali residue after desalination and solidification of salt, and the slag are mixed to obtain the alkali residue-based matrix soil;

[0096] The alkali residue after pressure filtration, the slag, the desulfurization ash, the first-grade fly ash, and the cement are mixed to obtain the alkali residue-based solidified agent;

[0097] The alkali residue-based matrix soil and the alkali residue-based solidified agent are stirred at 90 r / min for 3 min, water is added to the mixture, the amount of water is determined according to the fluidity index, the water is added to a basic fluidity of 170 mm, the polycarboxylic acid high-efficiency liquid water reducing agent is added in an amount of 1% of the dry alkali residue-based solidified agent, the fluidity is adjusted to 260 mm, and stirring is performed for 2 min to obtain the homomeric alkali residue-based fluid-state solidified soil.

[0098] Application Example 2

[0099] The homomeric alkali residue-based fluid-state solidified soil prepared in Example 1 is layered and filled into a mold, and is fully vibrated and rammed until the voids are completely discharged, then the test block is coated and placed in a standard curing room (temperature: 20±5℃, humidity: 95±5%) for curing. After one day, the mold is removed, and then the test block is placed in a standard curing room (temperature: 20±5℃, humidity: 95±5%) for curing for 3d, 7d, and 28d respectively, and finally the compressive strength test is performed. The compressive strengths of the test block at 3d, 7d, and 28d are 0.75 MPa, 1.3 MPa, and 3.6 MPa respectively.

[0100] Table 2 Test results of the homomeric alkali residue-based fluid-state solidified soil prepared in Example 2

[0101]

[0102] Example 3

[0103] The isomeric alkali residue-based fluidified solidified soil prepared in Example 1 is subjected to a wind power single-pile foundation scouring prevention scale model test, in which the isomeric alkali residue fluidified solidified soil prepared in Example 1 is pumped into the bottom of a scale model pile by a pipeline in four common scouring prevention modes (feathered prevention, flat bed prevention, winged prevention, and bottom protection), and artificial waves are used for scouring.

[0104] A photo of the isomeric alkali residue-based fluidified solidified soil subjected to a wind power single-pile foundation scouring prevention scale model test is shown in Figure 3 It can be seen from Figure 3 that the isomeric alkali residue scouring prevention pile fluidified solidified soil prepared in Example 1 has good wind power single-pile foundation scouring prevention effect.

[0105] Comparative Example

[0106] A fluidified solidified soil, wherein the curing agent of the fluidified solidified soil comprises, by mass percentage, cement 35%, slag 15%, nickel residue 40%, fly ash 5%, and sodium hydroxide 5%.

[0107] The water reducing agent is FED-1S polycarboxylic acid high-performance water reducing agent (standard type), and the mass percentage of the water reducing agent in the curing agent is 2%.

[0108] The matrix soil is loess, and the particle size is ≤5 mm.

[0109] The mass ratio of the matrix to the curing agent is 100:15

[0110] The preparation method of the fluidified solidified soil is as follows: the cement, slag, nickel residue, fly ash, and sodium hydroxide are mixed to obtain a curing agent;

[0111] The matrix soil and the alkali residue-based curing agent are stirred at 90 r / min for 3 min, water is added to the mixture, the amount of water is determined according to the fluidity index, the water is added to a basic fluidity of 170 mm, polycarboxylic acid high-efficiency liquid water reducing agent is added, the amount is 2% of the dry curing agent, the fluidity is adjusted to 280 mm, and stirring is performed for 2 min to obtain the fluidified solidified soil.

[0112] The fluid solidified soil prepared by the comparative example 1 is filled in the mold in layers, and after being fully vibrated and rammed until the voids are completely discharged, the test block is coated and placed in a standard curing chamber (temperature: 20±5℃, humidity 95±5%) for curing. After one day, it is demolded and placed in a standard curing chamber (temperature: 20±5℃, humidity 95±5%) for curing for 3d, 7d and 28d respectively, and finally the compressive strength test is carried out. The compressive strengths of 3d, 7d and 28d are 0.42MPa, 0.58MPa and 0.78MPa respectively.

[0113] Table 3 Test results of the fluid solidified soil prepared by the comparative example 1

[0114]

[0115] From the above results, it can be seen that the isomeric alkali residue based fluid solidified soil provided by the present application has high strength and stability after solidification, which is because the present application uses different forms and structures of isomeric alkali residues from the same source to prepare alkali residue based solidifying agent and alkali residue based matrix soil respectively, uses the alkali residue based solidifying agent to solidify the alkali residue based matrix soil to form fluid solidified soil. The present application uses filter pressed alkali residue, slag, desulfurized ash, fly ash and cement to prepare alkali residue based solidifying agent. The present application uses high water content paste-like raw alkali residue, desalted solid salt alkali residue and slag as alkali residue based matrix soil. The present application uses isomeric alkali residues with different structures and forms, which can be used as matrix soil on the one hand and can be used to prepare solidifying agent on the other hand, to promote and improve the physicochemical reaction and particle size matching between different components, thereby improving the mechanical properties of the isomeric alkali residue based fluid solidified soil. The present application can adjust the fluidity of the isomeric alkali residue based fluid solidified soil by adding an appropriate amount of water and water reducing agent, which can meet the construction requirements and has excellent compacting performance.

[0116] The above only describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered as the protection scope of the present application.

Claims

1. A homologous heterogeneous alkali residue-based fluidized solidified soil, characterized by, The flow degree of the isomeric alkali residue-based fluid-solidified soil is 170-400 mm. The isomeric alkali residue-based fluid-solidified soil comprises the following components: alkali residue-based matrix soil, alkali residue-based solidifying agent, water reducing agent and water; the mass ratio of the alkali residue-based matrix soil and the alkali residue-based solidifying agent is 100: (10-30); The alkali residue-based matrix soil comprises the following components in percentage of the mass of the alkali residue-based matrix soil: 40-50% of paste-like original alkali residue, 20-30% of alkali residue after desalination and solidification and 20-40% of slag; The alkali residue-based solidifying agent comprises the following components in percentage of the mass of the alkali residue-based solidifying agent: 25-40% of alkali residue after pressure filtration, 35-50% of slag, 10-15% of desulfurized ash, 10-15% of fly ash and 10-15% of cement.

2. The isomeric alkaline residue-based fluidified solidified soil according to claim 1, characterized in that, The water content of the paste-like original alkali residue is ≥200%.

3. The isomeric alkaline residue-based fluidified solidified soil according to claim 1, characterized in that, The particle size of the alkali residue after desalination and solidification is ≤5 mm.

4. The isomeric alkaline residue-based fluidified solidified soil according to claim 1, characterized in that, The water content of the alkali residue after pressure filtration is ≤50%.

5. The isomeric alkaline residue-based fluidified solidified soil according to claim 1, characterized in that, The slag comprises water-quenched blast furnace slag.

6. The isomeric alkaline residue-based fluidified solidified soil according to claim 1, characterized in that, The fly ash is first-grade fly ash.

7. The isomeric alkaline residue-based fluidified solidified soil according to claim 1, characterized in that, The specific surface area of the alkali residue-based curing agent is 300-400 m 2 / kg, and the amount of residual material on a 45-μm square-hole screen is not less than 5%.

8. A preparation method of the isomeric alkali residue-based fluid-solidified soil according to any one of claims 1-7, comprising the following steps: mixing paste-like original alkali residue, alkali residue after desalination and solidification and slag to obtain alkali residue-based matrix soil; mixing alkali residue after pressure filtration, slag, desulfurized ash, fly ash and cement to obtain alkali residue-based solidifying agent; mixing the alkali residue-based matrix soil, the alkali residue-based solidifying agent, water reducing agent and water to obtain isomeric alkali residue-based fluid-solidified soil.

9. Application of the isomeric alkali residue-based fluid-solidified soil according to any one of claims 1-7 or the isomeric alkali residue-based fluid-solidified soil prepared by the preparation method of claim 8 in anti-scouring protection piles.

10. Use according to claim 9, characterized in that, The method of the application comprises pumping the isomeric alkali residue-based fluid-solidified soil to the root of the base pile of the anti-scouring protection pile, and hardening around the root of the base pile to form a protective layer.

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