Premixed flow-state solidified soil and preparation method thereof

Abstract

The invention relates to premixed flow-state solidified soil and a preparation method thereof. The premixed flow-state solidified soil is prepared from the following raw materials: muck, a water reducing agent, curing agent slurry and water, the curing agent slurry comprises a curing agent; the curing agent comprises mineral powder, Portland cement, sodium silicate and calcium chloride; the mass of the curing agent accounts for 10-20% of the mass of dry soil in the muck; the mass of the water reducing agent accounts for 0.2-0.6% of the mass of dry soil in the muck; the mass of the water accounts for 60-100% of the mass of dry soil in the muck. The premixed flow-state solidified soil provided by the invention has good flowability and self-compaction performance, and has the performance advantages of high solidification speed, high solidification strength, good backfill effect and the like at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of fluidized solidified soil, and in particular to a premixed fluidized solidified soil and a preparation method thereof. Background Art

[0002] With the continuous advancement of urbanization, the amount of construction waste soil is increasing, and its recycling and utilization problem is becoming more and more prominent, becoming a key problem that needs to be solved in the field of foundation construction. If the waste soil can be effectively recycled and utilized, it can not only reduce resource waste and reduce project costs, but also significantly reduce the pressure on the environment. At present, the current research direction of waste soil treatment is to mix the waste soil with soil solidifier slurry, water, admixtures, etc. in a certain proportion to make a fluid solidified soil with fluidity.

[0003] At present, traditional engineering backfill methods include backfilling with plain soil, backfilling with fly ash and sand and gravel, etc. However, the above backfilling methods often lead to problems such as loose backfilling and high backfilling costs. At the same time, in engineering practice, soil loss often leads to the formation of underground cavities, which become a potential threat to urban road collapse. Especially when dealing with complex foundation pits, narrow spaces or backfilling in key areas, problems such as mechanical construction difficulties, inability to construct or substandard density often occur. As a new type of backfill material, fluidized solidified soil has the advantages of good fluidity, high strength and good stability, which can well solve the problems of traditional backfill materials and processes.

[0004] Therefore, it is an urgent need in the current engineering field to provide a premixed fluidized soil with high strength, high stability and fluidity that meets construction requirements. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a premixed fluidized solidified soil and a preparation method thereof. Compared with the prior art, the premixed fluidized solidified soil provided by the present invention has good fluidity and self-compacting properties, and at the same time has the performance advantages of fast solidification speed, high solidification strength, and good backfill effect.

[0006] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a premixed fluidized solidified soil, wherein the raw materials of the premixed fluidized solidified soil include: slag, water reducing agent, solidifying agent slurry and water;

[0008] The curing agent slurry includes a curing agent;

[0009] The curing agent includes mineral powder, silicate cement, sodium silicate and calcium chloride;

[0010] The mass of the curing agent accounts for 10-20% of the mass of dry soil in the slag;

[0011] The mass of the water reducing agent accounts for 0.2-0.6% of the mass of dry soil in the muck;

[0012] The mass of the water accounts for 60-100% of the mass of dry soil in the muck.

[0013] In the present invention, by controlling the raw materials of the ready-mixed flowable solidified soil including muck, water reducing agent, curing agent slurry and water, etc. and controlling their mass percentages based on dry soil, the performance of the flowable solidified soil is optimized. On the one hand, by designing the curing agent including mineral powder, portland cement, sodium silicate and calcium chloride, the curing time can be shortened, its strength and stability can be improved, meeting the strength requirements of different engineering scenarios; on the other hand, by adding a water reducing agent and controlling its addition amount, the ready-mixed flowable solidified soil can have good fluidity and self-compacting property, and can easily fill complex spaces, realizing fast and efficient construction.

[0014] In the present invention, the mass of the curing agent accounts for 10-20% of the mass of dry soil in the muck, for example, it can be 10%, 12%, 14%, 16%, 18% or 20%, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable; the mass of the water reducing agent accounts for 0.2-0.6% of the mass of dry soil in the muck, for example, it can be 0.2%, 0.3%, 0.4%, 0.5% or 0.6%, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable; the mass of the water accounts for 60-100% of the mass of dry soil in the muck, for example, it can be 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or 100%, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0015] In the present invention, the portland cement is the ordinary portland cement commonly used in the art.

[0016] Preferably, the mineral powder includes S95 grade granulated blast furnace slag powder.

[0017] Preferably, the S95 grade granulated blast furnace slag powder, by mass percentage, includes SiO 2 32-36%, for example, it can be 32%, 32.5%, 33%, 33.5%, 34%, 34.5%, 35%, 35.5% or 36%, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable; Al 2 O 314 - 18%, for example, it can be 14%, 15%, 16%, 17% or 18%, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable; CaO 36 - 40%, for example, it can be 36%, 37%, 38%, 39% or 40%, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable; TiO 2 3.5 - 4%, for example, it can be 3.5%, 3.6%, 3.7%, 3.8%, 3.9% or 4%, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable; SO 3 2 - 3%, for example, it can be 2%, 2.2%, 2.4%, 2.6%, 2.8% or 3%, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable; Na 2 O 1 - 2%, for example, it can be 1%, 1.2%, 1.4%, 1.6%, 1.8% or 2%, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable; other impurities 0.3 - 1%, for example, it can be 0.3%, 0.4%, 0.6%, 0.8% or 1%, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable. In the present invention, the other impurities refer to conventional impurities such as other oxides that are inevitable in the ore powder.

[0018] Preferably, the modulus of the sodium silicate is 2 - 3.5, for example, it can be 2, 2.2, 2.4, 2.6, 2.8, 3, 3.2, 3.4 or 3.5, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0019] In the present invention, by preferably controlling the modulus of the sodium silicate, the curing rate can be further adjusted, and the strength and durability can be improved.

[0020] In the present invention, the sodium silicate is the commonly used sodium silicate in the art, for example, the sodium silicate meeting the requirements of national standard GB / T4209 - 2022.

[0021] Preferably, by mass parts, the curing agent includes: 46 - 58 parts of mineral powder, which can be, for example, 46 parts, 47 parts, 48 parts, 49 parts, 50 parts, 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts or 58 parts, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable; 27 - 39 parts of portland cement, which can be, for example, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts or 39 parts, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable; 7 - 13 parts of sodium silicate, which can be, for example, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts or 13 parts, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable; 0.5 - 1.7 parts of calcium chloride, which can be, for example, 0.5 parts, 0.6 parts, 0.8 parts, 1.0 parts, 1.2 parts, 1.4 parts, 1.6 parts or 1.7 parts, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0022] In the present invention, by preferably controlling the components and their mass parts of the curing agent, the synergistic effect of each component can be fully exerted, so that the solidified soil obtains higher strength and the durability of the solidified soil is enhanced. The addition of calcium chloride is mainly used as an early strength agent to improve the early strength of the ready - mixed flowable solidified soil.

[0023] Preferably, the water - reducing agent includes any one or a combination of at least two of polycarboxylate water - reducing agent, naphthalene - based water - reducing agent, melamine water - reducing agent or lignosulfonate water - reducing agent.

[0024] In the present invention, the polycarboxylate water - reducing agent, naphthalene - based water - reducing agent, melamine water - reducing agent or lignosulfonate water - reducing agent are common water - reducing agents in the art. For example, the polycarboxylate water - reducing agent can adopt the standard polycarboxylate water - reducing agent commonly used in the art, which complies with standards GB8076 and GB8077.

[0025] In the second aspect, the present invention provides a preparation method of the ready - mixed flowable solidified soil as described in the first aspect of the present invention. The preparation method includes the following steps:

[0026] (1) Sampling and detecting the construction site muck to obtain the moisture content;

[0027] (2) According to the moisture content obtained in step (1), calculate the mass of dry soil in the muck, and mix the muck and water according to the percentage of water in the mass of dry soil to obtain slurry;

[0028] (3) Sequentially add a water - reducing agent and a curing agent slurry to the slurry obtained in step (2) to obtain the ready - mixed flowable solidified soil.

[0029] The preparation method provided by the present invention can reduce the processing cost, reduce the waste of land resources through the consumption of construction waste, improve the construction safety, and ensure the reliability of construction quality.

[0030] Preferably, the curing agent slurry in step (3) is obtained by mixing a curing agent and water.

[0031] Preferably, the mass ratio of water to the curing agent is 0.5 - 1.5, and can be, for example, 0.5, 0.6, 0.8, 1.0, 1.2, 1.4, or 1.5, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0032] In the present invention, by preferably controlling the mass ratio of water to the curing agent, it is possible to avoid problems such as a decrease in the strength of the premixed flowable solidified soil, an increase in shrinkage, too high fluidity, a decrease in durability, and an extension of the setting time caused by excessive water, and at the same time avoid problems such as poor workability and compactness, slow early strength development, and an increased risk of cracking caused by too little water.

[0033] Preferably, the curing agent and water are stirred after mixing.

[0034] Preferably, the stirring time of the curing agent and water is 30 - 50 s, and can be, for example, 30 s, 35 s, 40 s, 45 s, or 50 s, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0035] Preferably, the stirring rate of the curing agent and water is 30 - 40 r / min, and can be, for example, 30 r / min, 32 r / min, 34 r / min, 36 r / min, 38 r / min, or 40 r / min, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0036] Preferably, the curing agent is obtained by mixing components including mineral powder, portland cement, sodium silicate, and calcium chloride.

[0037] Preferably, the mineral powder, portland cement, sodium silicate, and calcium chloride are stirred after mixing.

[0038] Preferably, the stirring time of the mineral powder, portland cement, sodium silicate, and calcium chloride is 20 - 30 min, and can be, for example, 20 min, 22 min, 24 min, 26 min, 28 min, or 30 min, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0039] Preferably, the mixing rate of the mineral powder, portland cement, sodium silicate and calcium chloride is 30 - 40 r / min. For example, it can be 30 r / min, 32 r / min, 34 r / min, 36 r / min, 38 r / min or 40 r / min. However, it is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0040] Preferably, after the addition of the curing agent slurry, stirring is carried out.

[0041] Preferably, the stirring time after the addition of the curing agent slurry is 5 - 10 min. For example, it can be 5 min, 6 min, 7 min, 8 min, 9 min or 10 min. However, it is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0042] Preferably, the mixing rate after the addition of the curing agent slurry is 30 - 40 r / min. For example, it can be 30 r / min, 32 r / min, 34 r / min, 36 r / min, 38 r / min or 40 r / min. However, it is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0043] As a preferred technical solution of the second aspect of the present invention, the preparation method includes the following steps:

[0044] (1) Sampling and testing the muck at the construction site to obtain the water content;

[0045] (2) According to the water content obtained in step (1), calculate the mass of dry soil in the muck, and mix the muck and water according to the percentage of water in the mass of dry soil to obtain slurry;

[0046] (3) Add a water reducing agent and a curing agent slurry to the slurry obtained in step (2) in sequence, and then stir for 5 - 10 min under the condition of a rotation speed of 30 - 40 r / min to obtain premixed fluidized solidified soil;

[0047] The curing agent slurry is obtained by mixing water and a curing agent in a mass ratio of 0.5 - 1.5 and stirring for 30 - 50 s under the condition of a rate of 30 - 40 r / min. The curing agent is obtained by mixing each component including mineral powder, portland cement, sodium silicate and calcium chloride and stirring for 20 - 30 min under the condition of a rate of 30 - 40 r / min.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] (1) The premixed flowable solidified soil provided by the present invention has good fluidity and self-compacting property, can achieve rapid and efficient construction, and does not require vibration. It can easily fill complex spaces through pumping or chute operation, significantly shortening the construction period and improving the construction efficiency.

[0050] (2) By adding a curing agent to the premixed flowable solidified soil provided by the present invention, it can have good strength, volume stability and water stability. Its rapid curing property ensures the continuity of backfilling, meets the needs of various engineering scenarios, and shows good environmental protection characteristics during the production and use processes. The curing agent used in the present invention can recycle industrial waste, reduce the impact on the environment, save resources, and achieve double economic and environmental benefits.

[0051] (3) In engineering applications, the premixed flowable solidified soil provided by the present invention can reduce material costs, solve the problem of waste soil occupying land by consuming a large amount of muck, improve the construction safety, ensure the reliability of engineering quality, and has a broad application prospect.

[0052] (4) The premixed flowable solidified soil provided by the present invention has good fluidity, high early strength, continuous growth of late strength, good strength stability. The 1-day compressive strength reaches above 0.12 MPa, the 3-day compressive strength reaches above 0.23 MPa, the 7-day compressive strength reaches above 0.29 MPa, and the 28-day compressive strength reaches above 0.55 MPa. Under better conditions, the 1-day compressive strength reaches above 0.24 MPa, the 3-day compressive strength reaches above 0.30 MPa, the 7-day compressive strength reaches above 0.37 MPa, and the 28-day compressive strength reaches above 0.70 MPa, meeting the specification requirements of the fluidity within 180 - 240 mm. Detailed implementation mode

[0053] The technical solution of the present invention will be further described below through specific implementation modes. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations to the present invention.

[0054] Example 1

[0055] This example provides a premixed flowable solidified soil. The raw materials of the premixed flowable solidified soil include: muck, water reducer, curing agent slurry and water. The curing agent slurry includes a curing agent. Among them, the mass of the curing agent accounts for 10% of the dry soil mass in the muck, the mass of the water reducer accounts for 0.4% of the dry soil mass in the muck, and the mass of the water accounts for 80% of the dry soil mass in the muck;

[0056] The curing agent includes 52 parts of S95 grade granulated blast furnace slag powder, 33 parts of portland cement, 10 parts of sodium silicate (modulus 3) and 1.1 parts of calcium chloride; The S95 grade granulated blast furnace slag powder includes SiO2 36.0%, Al 2 O 3 18.0%, CaO 38.36%, TiO 2 3.62%, SO 3 2.42%, Na 2 O 1.13%, other impurities 0.47%. Sodium silicate conforms to GB / T 4209-2022, and the water reducing agent is a standard polycarboxylate water reducing agent, conforming to GB8076.

[0057] This embodiment also provides a preparation method of the above-mentioned ready-mixed flowing solidified soil, and the preparation method includes the following steps:

[0058] (1) Sampling and detecting the muck at the project site, and obtaining a water content of 60%;

[0059] (2) According to the water content obtained in step (1), calculate the mass of dry soil in the muck, and mix the muck and water according to the percentage of water in the mass of dry soil to obtain slurry;

[0060] (3) Add a water reducing agent and a curing agent slurry to the slurry obtained in step (2) in sequence, and then stir for 8 minutes under the condition of a rotation speed of 35 r / min to obtain ready-mixed flowing solidified soil;

[0061] The curing agent slurry is obtained by mixing water and a curing agent according to a mass ratio of 0.8 and then stirring for 40 s under the condition of a rate of 35 r / min. The curing agent is obtained by mixing each component including mineral powder, portland cement, sodium silicate and calcium chloride and then stirring for 25 minutes under the condition of a rate of 35 r / min.

[0062] Example 2

[0063] This embodiment provides a ready-mixed flowing solidified soil, and the raw materials of the ready-mixed flowing solidified soil include: muck, water reducing agent, curing agent slurry and water. The curing agent slurry includes a curing agent. Among them, the mass of the curing agent accounts for 15% of the mass of dry soil in the muck, the mass of the water reducing agent accounts for 0.2% of the mass of dry soil in the muck, and the mass of water accounts for 100% of the mass of dry soil in the muck;

[0064] The curing agent includes 46 parts of S95 grade granulated blast furnace slag powder, 39 parts of portland cement, 7 parts of sodium silicate (modulus 3.5) and 1.7 parts of calcium chloride; the S95 grade granulated blast furnace slag powder includes SiO 2 36.0%, Al 2 O 3 18.0%, CaO 38.36%, TiO 2 3.62%, SO 3 2.42%, Na2 O1.13%, other impurities 0.47%, sodium silicate conforms to GB / T4209-2022, and the water reducing agent is a standard polycarboxylate water reducing agent, conforming to GB8076.

[0065] This embodiment also provides a preparation method of the above-mentioned ready-mixed flowing solidified soil, and the preparation method includes the following steps:

[0066] (1) Sampling and testing the muck at the project site, and obtaining a water content of 60%;

[0067] (2) According to the water content obtained in step (1), calculate the mass of dry soil in the muck, and mix the muck and water according to the percentage of water in the mass of dry soil to obtain slurry;

[0068] (3) Add a water reducing agent and a curing agent slurry to the slurry obtained in step (2) in sequence, and then stir for 10 min under the condition of a rotation speed of 30 r / min to obtain ready-mixed flowing solidified soil;

[0069] The curing agent slurry is obtained by mixing water and a curing agent according to a mass ratio of 1.5 and stirring for 50 s under the condition of a rate of 30 r / min. The curing agent is obtained by mixing each component including mineral powder, portland cement, sodium silicate and calcium chloride and stirring for 20 min under the condition of a rate of 40 r / min.

[0070] Example 3

[0071] This embodiment provides a ready-mixed flowing solidified soil, and the raw materials of the ready-mixed flowing solidified soil include: muck, water reducing agent, curing agent slurry and water. The curing agent slurry includes a curing agent. Among them, the mass of the curing agent accounts for 20% of the mass of dry soil in the muck, the mass of the water reducing agent accounts for 0.6% of the mass of dry soil in the muck, and the mass of water accounts for 60% of the mass of dry soil in the muck;

[0072] The curing agent includes 58 parts of S95 grade granulated blast furnace slag powder, 27 parts of portland cement, 13 parts of sodium silicate (modulus 2) and 0.5 part of calcium chloride; the S95 grade granulated blast furnace slag powder includes SiO 2 36.0%, Al 2 O 3 18.0%, CaO 38.36%, TiO 2 3.62%, SO 3 2.42%, Na 2 O 1.13%, other impurities 0.47%, sodium silicate conforms to GB / T4209-2022, and the water reducing agent is a standard polycarboxylate water reducing agent, conforming to GB8076.

[0073] This embodiment also provides a preparation method of the above-mentioned premixed flowing solidified soil, and the preparation method includes the following steps:

[0074] (1) Sampling and testing the muck at the project site, and obtaining a water content of 60%;

[0075] (2) According to the water content obtained in step (1), calculating the mass of dry soil in the muck, and mixing the muck and water according to the percentage of water in the mass of dry soil to obtain slurry;

[0076] (3) Adding a water reducing agent and a curing agent slurry to the slurry obtained in step (2) in sequence, and then stirring for 5 minutes under the condition of a rotation speed of 40 r / min to obtain premixed flowing solidified soil;

[0077] The curing agent slurry is obtained by mixing water and a curing agent according to a mass ratio of 0.5 and then stirring for 30 s under the condition of a rate of 40 r / min. The curing agent is obtained by mixing each component including mineral powder, portland cement, sodium silicate and calcium chloride and then stirring for 30 minutes under the condition of a rate of 30 r / min.

[0078] Example 4

[0079] This embodiment provides a premixed flowing solidified soil, and the difference compared with Example 1 is only that the modulus of sodium silicate is 1.5.

[0080] Example 5

[0081] This embodiment provides a premixed flowing solidified soil, and the difference compared with Example 1 is only that the curing agent includes 40 parts of S95 grade granulated blast furnace slag powder, 45 parts of portland cement, 10 parts of sodium silicate

[0082] and 1.1 parts of calcium chloride.

[0083] Example 6

[0084] This embodiment provides a premixed flowing solidified soil, and the difference compared with Example 1 is only that the curing agent includes 65 parts of S95 grade granulated blast furnace slag powder, 20 parts of portland cement, 10 parts of sodium silicate

[0085] and 1.1 parts of calcium chloride.

[0086] Example 7

[0087] This embodiment provides a preparation method of premixed flowing solidified soil, and the difference compared with Example 1 is only that the mass ratio of water to the curing agent is 1.6.

[0088] Comparative Example 1

[0089] This comparative example provides a premixed flowing solidified soil, which is only different from that of Example 1 in that the mass of the curing agent accounts for 5% of the mass of the dry soil in the muck.

[0090] Comparative Example 2

[0091] This comparative example provides a premixed flowing solidified soil, which is only different from that of Example 1 in that the mass of the water reducing agent accounts for 0.1% of the mass of the dry soil in the muck.

[0092] Comparative Examples 3 - 6

[0093] These Comparative Examples 3 - 6 respectively provide a premixed flowing solidified soil, which is only different from that of Example 1 in that the curing agent does not add mineral powder, portland cement, sodium silicate and calcium chloride in turn.

[0094] Comparative Example 7

[0095] This comparative example provides a premixed flowing solidified soil, which is only different from that of Example 1 in that the curing agent is replaced with the same mass fraction of portland cement.

[0096] Performance test:

[0097] (1) Unconfined compressive strength: In this test, the premixed flowing solidified soil provided in the above examples and comparative examples was poured into a mixing pot for mixing. The inner walls of the glass plate and the frustum cone mold were wiped with a wet cloth in advance, and the frustum cone mold was placed in the center of the glass plate. Then, the well - mixed premixed flowing solidified soil was quickly poured full into the frustum cone mold until the slurry was flush with the upper opening of the frustum cone mold, and it was leveled with a knife. The frustum cone mold should comply with the provisions of GB / T2419, with dimensions: inner diameter of the lower opening 100mm ± 0.5m, inner diameter of the upper opening 70mm ± 0.5mm, height 60mm ± 0.5mm, and the size of the glass plate not less than 500mm × 500mm, and it was placed on a horizontal test bench. The unconfined compressive strengths at 1 day, 3 days, 7 days, and 28 days were respectively tested according to the provisions of the unconfined compressive strength in the "Design Code for Cement - Soil Mix Proportions" JGJ / T233, and the results are shown in Table 1.

[0098] (2) Fluidity: The premixed flowing solidified soil provided in the above examples and comparative examples was poured into a mixing pot for mixing. The mixed slurry was quickly poured into the frustum cone mold, leveled with a scraper, the frustum cone mold was lifted vertically, and at the same time, the stopwatch was started. Let the slurry flow on the glass plate. At 30s, the diameters of two mutually perpendicular directions of the flowing part were measured with a ruler, and the average value was taken as the initial fluidity of the slurry. The results are shown in Table 1.

[0099] Table 1

[0100]

[0101]

[0102] It can be seen from the data in Table 1 that;

[0103] (1) It can be seen from the data of Examples 1-7 that the ready-mixed flowing solidified soil provided by the present invention has good fluidity, high early strength, continuous growth of later strength, good strength stability, the compressive strength at 1 day reaches above 0.12 MPa, the compressive strength at 3 days reaches above 0.23 MPa, the compressive strength at 7 days reaches above 0.29 MPa, and the compressive strength at 28 days reaches above 0.55 MPa; under better conditions, the compressive strength at 1 day reaches above 0.24 MPa, the compressive strength at 3 days reaches above 0.30 MPa, the compressive strength at 7 days reaches above 0.37 MPa, and the compressive strength at 28 days reaches above 0.70 MPa, meeting the specification requirements with a fluidity within 180-240 mm.

[0104] (2) By comprehensively comparing the data of Example 1 and Example 4, as well as the data of Example 1 and Examples 5-6, it can be seen that the compressive strength in Example 1 is significantly higher than that in Examples 4-6. Thus, it can be seen that by preferably controlling the modulus of sodium silicate and the mass fractions of each raw material in the curing agent, the present invention can further improve the compressive strength of the ready-mixed flowing solidified soil at each age such as 1 day, 3 days, 7 days, and 28 days.

[0105] (3) By comprehensively comparing the data of Example 1 and Example 7, it can be seen that in the preparation method provided by the present invention, by preferably controlling the mass ratio of water to the curing agent, the compressive strength of the ready-mixed flowing solidified soil at each age such as 1 day, 3 days, 7 days, and 28 days can be further improved.

[0106] (4) By comprehensively comparing the data of Example 1 and Comparative Examples 1-2, it can be seen that by controlling the mass ratios of the curing agent and the water reducer to the dry soil in the slag in the ready-mixed flowing solidified soil provided by the present invention, the fluidity of the ready-mixed flowing solidified soil can be improved, and the compressive strength at each age can be improved.

[0107] (5) By comprehensively comparing the data of Example 1 and Comparative Examples 5-9, it can be seen that by specifically using a curing agent with synergistic combination of mineral powder, portland cement, sodium silicate, and calcium chloride, the present invention can not only improve the fluidity, but also enable the ready-mixed flowing solidified soil to exhibit high compressive strength at each age such as 1 day, 3 days, 7 days, and 28 days, and has good strength stability.

[0108] In summary, the ready-mixed flowing solidified soil provided by the present invention has good fluidity and self-compacting property, and at the same time has performance advantages such as fast curing speed, high curing strength, and good backfilling effect.

[0109] The applicant declares that the above description is only a specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A premixed fluidized solidified soil, characterized in that: The raw materials of the premixed fluidized solidified soil include: slag soil, water reducing agent, solidifying agent slurry and water; The curing agent slurry includes a curing agent; The curing agent includes mineral powder, silicate cement, sodium silicate and calcium chloride; The mass of the curing agent accounts for 10-20% of the mass of dry soil in the slag; The mass of the water reducing agent accounts for 0.2-0.6% of the mass of dry soil in the slag; The mass of the water accounts for 60-100% of the mass of the dry soil in the slag.

2. The premixed fluidized solidified soil according to claim 1, characterized in that: The mineral powder includes S95 grade granulated blast furnace slag powder; Preferably, the S95 grade granulated blast furnace slag powder comprises, by mass percentage, 32-36% SiO2, 14-18% Al2O3, 36-40% CaO, 3.5-4% TiO2, 2-3% SO3, 1-2% Na2O, and 0.3-1% other impurities.

3. The premixed fluidized solidified soil according to claim 1 or 2, characterized in that: The modulus of the sodium silicate is 2-3.

5.

4. The premixed fluidized solidified soil according to any one of claims 1 to 3, characterized in that: The curing agent comprises, by weight:

5. The premixed fluidized solidified soil according to any one of claims 1 to 4, characterized in that: The water reducer includes any one of a polycarboxylate water reducer, a naphthalene water reducer, a melamine water reducer or a lignin sulfonate water reducer, or a combination of at least two of them.

6. A method for preparing the premixed fluidized solidified soil according to any one of claims 1 to 5, characterized in that: The preparation method comprises the following steps: (1) Take samples of the soil at the construction site and test the moisture content; (2) calculating the mass of dry soil in the slag according to the moisture content obtained in step (1), and mixing the slag and water according to the percentage of water in the dry soil mass to obtain mud; (3) Adding a water reducing agent and a curing agent slurry to the mud obtained in step (2) in sequence to obtain a premixed fluidized solidified soil.

7. The preparation method according to claim 6, characterized in that: The curing agent slurry in step (3) is obtained by mixing a curing agent and water; Preferably, the mass ratio of water to curing agent is 0.5-1.5; Preferably, the curing agent and water are mixed and stirred; Preferably, the curing agent and water are stirred for 30-50 seconds; Preferably, the curing agent and water are stirred at a rate of 30-40 r / min.

8. The preparation method according to claim 7, characterized in that: The curing agent is obtained by mixing components including mineral powder, silicate cement, sodium silicate and calcium chloride; Preferably, the mineral powder, silicate cement, sodium silicate and calcium chloride are mixed and stirred; Preferably, the mineral powder, silicate cement, sodium silicate and calcium chloride are stirred for 20-30 minutes; Preferably, the mineral powder, silicate cement, sodium silicate and calcium chloride are stirred at a rate of 30-40 r / min.

9. The preparation method according to any one of claims 6 to 8, characterized in that: Step (3) wherein the curing agent slurry is added and stirred; Preferably, the curing agent slurry is stirred for 5-10 minutes after addition; Preferably, the stirring rate after the curing agent slurry is added is 30-40 r / min.

10. The preparation method according to any one of claims 6 to 9, characterized in that: The preparation method comprises the following steps: (1) Take samples of the soil at the construction site and test the moisture content; (2) calculating the mass of dry soil in the slag according to the moisture content obtained in step (1), and mixing the slag and water according to the percentage of water in the dry soil mass to obtain mud; (3) adding a water reducing agent and a curing agent slurry to the mud obtained in step (2) in sequence, and then stirring for 5-10 minutes at a rotation speed of 30-40 r / min to obtain a premixed fluidized solidified soil; The curing agent slurry is obtained by mixing water and curing agent in a mass ratio of 0.5-1.5, and stirring at a rate of 30-40r / min for 30-50s. The curing agent is obtained by mixing components including mineral powder, silicate cement, sodium silicate and calcium chloride, and stirring at a rate of 30-40r / min for 20-30min.

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