Liquid composite consolidated soil and preparation method thereof

Abstract

The present application provides a liquid composite consolidation soil and a preparation method thereof, and relates to the field of building materials. The raw materials of the liquid composite consolidation soil are calculated by mass percentage, including: 40%-90% soil material, 5%-40% cementitious material, 0.01%-1% soil curing agent, 1%-10% quick setting agent, 0.01%-1% water reducing agent, and the remainder is water. The preparation method of the liquid composite consolidation soil comprises: mixing the raw materials and stirring to obtain the liquid composite consolidation soil. The liquid composite consolidation soil provided in the present application is improved for the soil and slag excavated and replaced in various projects, so that the soil and slag excavated and replaced in various projects meet the needs of preparing liquid composite consolidation soil, and the soil and slag excavated and replaced in various projects are used to the greatest extent, reducing the stacking, transportation and abandonment of the soil and slag excavated and replaced in various projects, reducing construction costs and avoiding environmental pollution.

Description

Technical Field

[0001] The present application relates to the field of building materials, and in particular to a liquid composite consolidated soil and a preparation method thereof. Background Art

[0002] With the rapid development of urban construction, the amount of urban construction waste is also increasing. At present, the disposal of construction waste mainly adopts a simple mixed landfill method with a low degree of harmlessness. However, in the foundation treatment of various projects such as ports, roads, mines, and urban construction, the amount of soil and slag excavated and replaced can reach billions or even tens of billions of cubic meters each year. Most of these soil and slag are not effectively recycled and utilized, but are regarded as wastes and piled up, transported out, and abandoned, thus causing a large waste of resources and easily causing secondary pollution to the surrounding environment.

[0003] On the other hand, in some parts of road construction and maintenance projects, such as the backfill of the three backs (bridge abutment back, culvert abutment back, retaining wall back) in highway projects, the backfill of pipe trenches in municipal projects, and the backfill around inspection wells, the rolling and compaction quality of traditional backfill materials (such as soil fillers, graded sand and gravel fillers, etc.) is difficult to ensure due to the narrow construction operation space and the existence of dead angles at the interface with the structure, which often induces engineering diseases, complicated procedures, high costs and a lot of waste. When dangerous situations such as road collapse occur on urban roads, traditional backfill technology is even more difficult to meet the requirements of construction speed and quality.

[0004] Liquid composite consolidation soil has high fluidity and can fill itself under its own weight without vibration or a little vibration to form a self-compacting structure. It can replace the cement-based low-strength backfill material of graded traditional backfill materials. Liquid composite consolidation soil is similar to general concrete or mortar in material composition, but the technical requirements for raw materials are far less stringent than those for concrete or mortar.

[0005] The main problem that needs to be solved in preparing liquid composite consolidated soil using these soils and slag is how to utilize soil materials in large quantities and ensure their stable performance. Summary of the invention

[0006] The purpose of this application is to provide a liquid composite consolidated soil and a preparation method thereof to solve the above problems.

[0007] To achieve the above objectives, this application adopts the following technical solutions:

[0008] A liquid composite consolidated soil, the raw materials of which are calculated by mass percentage and include: 40%-90% soil material, 5%-40% cementitious material, 0.01%-0.03% soil solidifier, 1%-10% accelerating setting agent, 0.01%-1% water reducing agent, and the balance is water.

[0009] Optionally, in the raw materials of the liquid composite consolidated soil, the amount of soil material can be 40%, 50%, 60%, 70%, 80%, 90% or any value between 40% and 90%, the amount of cementitious material can be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40% or any value between 5% and 40%, and the amount of soil solidifier can be 0.01%, 0.02%, 0.03% or any value between 0.01% and 0.02%. .03%, the dosage of accelerator can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10% or any value between 1% and 10%, the dosage of water reducer can be 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% or any value between 0.01% and 1%, and the balance is water.

[0010] Preferably, the soil material is mud and / or slag obtained from engineering excavation and replacement.

[0011] Preferably, the soil material, calculated with its own mass as 100%, includes:

[0012] 10-20% of fine-grained soil is 0.01mm-0.05mm, 20-40% of first intermediate-grained soil is greater than 0.05mm and less than or equal to 0.1mm, 30-50% of second intermediate-grained soil is greater than 0.1mm and less than or equal to 0.2mm, and 10-20% of coarse-grained soil is greater than 0.2mm and less than or equal to 1mm.

[0013] Grain size classification of soil materials can not only improve the compressive strength, but also effectively ensure the stability of the liquid system.

[0014] Optionally, in the soil material, the content of fine-grained soil can be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20% or any value between 10-20%, and the content of the first intermediate-sized soil can be 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40% or any value between 20-40%. The content of the second intermediate particle size soil can be 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50% or any value between 30-50%, and the content of the coarse-grained soil can be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20% or any value between 10-20%.

[0015] Preferably, the cementitious material includes one or more of cement, fly ash and lime.

[0016] Preferably, the soil curing agent includes one or more of an epoxy curing agent, an ionic curing agent, a microbial curing agent, an inorganic curing agent and a biological enzyme curing agent;

[0017] The quick-setting agent includes sodium silicate and / or potassium silicate;

[0018] The water reducer includes a naphthalene-based water reducer and / or a polycarboxylic acid water reducer.

[0019] Preferably, the liquid composite consolidated soil further comprises 1-3% of a stabilizer;

[0020] The stabilizer is

[0021] Optionally, the amount of the stabilizer may be 1%, 2%, 3% or any value between 1-3%.

[0022] The stabilizer is an isothiazolinone derivative, which is an existing substance. The preparation method thereof is roughly as follows: isothiazolin-3-one, sodium hydride, and N,N-dimethylformamide are reacted under a nitrogen atmosphere, and then γ-chloropropyltriethoxysilane is added, and the reaction is carried out for 30 minutes under ice bath conditions, and then the temperature is raised to 80° C. to react for 3 hours, and finally the solvent is separated to obtain the stabilizer.

[0023] The stabilizer can effectively improve the stability of the solid-liquid mixture formed by soil, cementitious materials, soil curing agents, accelerators, water reducers and water, so as to avoid precipitation and stratification of the liquid system before solidification, resulting in inconsistent performance at various locations of the material after use. The above-mentioned effect can be achieved due to the long side chain and heterocyclic structure of the compound, especially the side chain structure can make the soil and various additives form a temporary "weakly stable" structure, thereby improving the stability of the solid-liquid mixture.

[0024] The present application also provides a method for preparing the liquid composite consolidated soil, comprising:

[0025] The raw materials are mixed and stirred to obtain the liquid composite consolidated soil.

[0026] Preferably, the stirring comprises:

[0027] First, stir for 0.5-1.5 min at 1000-1500 rpm, then stir for 1-2 min at 500-800 rpm, and then stir for 1-3 min at 100-300 rpm.

[0028] By gradually reducing the stirring speed, the stability of the solid-liquid mixture can be further improved while stirring evenly, so as to ensure that it remains in a stable state before solidification and avoid sedimentation.

[0029] Preferably, the liquid composite consolidated soil further comprises a stabilizer, and the stabilizer is added during the third stirring.

[0030] Preferably, the liquid composite consolidated soil satisfies one or more of the following conditions:

[0031] (1) Fluidity 15 cm-30 cm;

[0032] (2) Setting time: 3 to 8 hours;

[0033] (3) 7-day unconfined compressive strength ≥ 0.5 MPa;

[0034] (4) Unconfined compressive strength at 28 days ≥ 3 MPa.

[0035] Compared with the prior art, the beneficial effects of this application include:

[0036] The liquid composite consolidation soil provided by the present application is improved for the soil and slag excavated and replaced in various projects, so that the soil and slag excavated and replaced in various projects meet the needs of preparing liquid composite consolidation soil, and the soil and slag excavated and replaced in various projects are used to the greatest extent, reducing the stacking, transportation and abandonment of the soil and slag excavated and replaced in various projects, reducing construction costs and avoiding environmental pollution. The liquid composite consolidation soil uses a large amount of soil and slag and has high stability. DETAILED DESCRIPTION

[0037] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. If specific conditions are not specified in the examples, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0038] The soil used in the embodiment is selected from the slag produced at a certain construction site and is sieved into a target particle size for use.

[0039] Example 1

[0040] This embodiment provides a liquid composite consolidation soil, the specific formula is as follows:

[0041] 1000 kg of liquid composite consolidated soil includes 750 kg of soil (soil and slag excavated and replaced in various projects), 100 kg of P.O42.5 ordinary Portland cement, 0.2 kg of soil curing agent (CG-1 type high-strength curing material produced by Beijing Zhongde Jianji Road and Bridge Engineering Technology Co., Ltd., and this material is used in the following embodiments), 40 kg of accelerator sodium silicate, 4 kg of polycarboxylic acid water reducer (POLYFLEX730 produced by Zhongwei High-tech), and the balance is water.

[0042] The soil material is calculated based on its own mass as 100%, including: 20% fine-grained soil of 0.01mm-0.05mm, 40% first intermediate particle size soil greater than 0.05mm and less than or equal to 0.1mm, 30% second intermediate particle size soil greater than 0.1mm and less than or equal to 0.2mm, and 10% coarse-grained soil greater than 0.2mm and less than or equal to 1mm.

[0043] The preparation method of the liquid composite consolidated soil comprises:

[0044] Combine all the ingredients and stir until evenly combined.

[0045] Example 2

[0046] This embodiment provides a liquid composite consolidation soil, the specific formula is as follows:

[0047] 1000 kg of liquid composite consolidated soil includes 800 kg of soil (mud and slag excavated and replaced in various projects), 60 kg of fly ash, 0.1 kg of soil solidifier, 30 kg of quick-setting agent sodium silicate, 5 kg of polycarboxylic acid water reducer, and the balance is water.

[0048] The soil material is calculated based on its own mass as 100%, including: 10% fine-grained soil of 0.01mm-0.05mm, 20% first intermediate-grained soil greater than 0.05mm and less than or equal to 0.1mm, 50% second intermediate-grained soil greater than 0.1mm and less than or equal to 0.2mm, and 20% coarse-grained soil greater than 0.2mm and less than or equal to 1mm.

[0049] The preparation method is the same as Example 1.

[0050] Example 3

[0051] This embodiment provides a liquid composite consolidation soil, the specific formula is as follows:

[0052] 1000 kg of liquid composite consolidated soil includes 750 kg of soil (soil and slag excavated and replaced in various projects), 70 kg of lime, 0.2 kg of soil solidifier, 20 kg of quick-setting agent sodium silicate, 4 kg of polycarboxylic acid water reducer, and the balance is water.

[0053] The soil material is calculated based on its own mass as 100%, including: 15% fine-grained soil of 0.01mm-0.05mm, 30% first intermediate particle size soil greater than 0.05mm and less than or equal to 0.1mm, 45% second intermediate particle size soil greater than 0.1mm and less than or equal to 0.2mm, and 10% coarse-grained soil greater than 0.2mm and less than or equal to 1mm.

[0054] The preparation method of the liquid composite consolidated soil comprises:

[0055] The raw materials were mixed, first stirred at 1200 rpm for 1 min, then stirred at 600 rpm for 2 min, and then stirred at 200 rpm for 2 min, to obtain the above-mentioned liquid composite consolidated soil.

[0056] Example 4

[0057] This embodiment provides a liquid composite consolidation soil, the specific formula is as follows:

[0058] 1000 kg of liquid composite consolidated soil includes 700 kg of soil (soil and slag excavated and replaced in various projects), 50 kg of P.O42.5 ordinary Portland cement, 25 kg of fly ash, 0.1 kg of soil solidifier, 28 kg of accelerator sodium silicate, 2 kg of polycarboxylic acid water reducer, and the balance is water.

[0059] The soil material formula is the same as in Example 3.

[0060] The preparation method of the liquid composite consolidated soil comprises:

[0061] The raw materials were mixed, first stirred at 1000 rpm for 0.5 min, then stirred at 500 rpm for 1.5 min, and then stirred at 100 rpm for 1 min.

[0062] Example 5

[0063] This embodiment provides a liquid composite consolidation soil, the specific formula is as follows:

[0064] 1000 kg of liquid composite consolidated soil includes 650 kg of soil (soil and slag excavated and replaced in various projects), 120 kg of P.O42.5 ordinary Portland cement, 0.1 kg of soil solidifier, 20 kg of accelerator sodium silicate, 3 kg of polycarboxylic acid water reducer, and the balance is water.

[0065] The soil material formula is the same as in Example 3.

[0066] The preparation method of the liquid composite consolidated soil comprises:

[0067] The raw materials were mixed, first stirred at 1500 rpm for 1.5 min, then stirred at 800 rpm for 1 min, and then stirred at 300 rpm for 2 min.

[0068] Example 6

[0069] This embodiment provides a liquid composite consolidation soil, the specific formula is as follows:

[0070] 1000 kg of liquid composite consolidated soil includes 600 kg of soil (soil and slag excavated and replaced in various projects), 160 kg of P.O42.5 ordinary Portland cement, 0.15 kg of soil solidifier, 10 kg of accelerator sodium silicate, 3 kg of polycarboxylic acid water reducer, and the rest is water.

[0071] The soil material formula and preparation method are the same as in Example 3.

[0072] Example 7

[0073] This embodiment provides a liquid composite consolidation soil, the specific formula is as follows:

[0074] 1000 kg of liquid composite consolidated soil includes 550 kg of soil (soil and slag excavated and replaced in various projects), 200 kg of P.O42.5 ordinary Portland cement, 0.1 kg of soil solidifier, 15 kg of accelerator sodium silicate, 2 kg of polycarboxylic acid water reducer, and the balance is water.

[0075] The soil material formula and preparation method are the same as in Example 3.

[0076] Example 8

[0077] This embodiment provides a liquid composite consolidation soil, the specific formula is as follows:

[0078] 1000 kg of liquid composite consolidated soil includes 530 kg of soil (soil and slag excavated and replaced in various projects), 220 kg of P.O42.5 ordinary Portland cement, 0.2 kg of soil solidifier, 32 kg of accelerator sodium silicate, 3 kg of polycarboxylic acid water reducer, and the rest is water.

[0079] The soil material formula and preparation method are the same as in Example 3.

[0080] Example 9

[0081] This embodiment provides a liquid composite consolidation soil, the specific formula is as follows:

[0082] 1000 kg of liquid composite consolidated soil includes 500 kg of soil (soil and slag excavated and replaced in various projects), 250 kg of P.O42.5 ordinary Portland cement, 0.25 kg of soil solidifier, 65 kg of accelerator sodium silicate, 3 kg of polycarboxylic acid water reducer, and the remainder is.

[0083] The soil material formula and preparation method are the same as in Example 3.

[0084] Example 10

[0085] This embodiment provides a liquid composite consolidation soil, the specific formula is as follows:

[0086] 1000 kg of liquid composite consolidated soil includes 450 kg of soil (soil and slag excavated and replaced in various projects), 300 kg of P.O42.5 ordinary Portland cement, 0.3 kg of soil solidifier, 45 kg of accelerator sodium silicate, 2 kg of polycarboxylic acid water reducer, and the balance is water.

[0087] The soil material formula and preparation method are the same as in Example 3.

[0088] Embodiment 11

[0089] The difference from Example 3 is that the soil material dosage is 740 kg and the stabilizer is added. 10 kg.

[0090] The stabilizer is added during the third stirring.

[0091] Comparative Example 1

[0092] Different from Example 3, the raw material slag is not screened, but is only ground to a particle size of less than or equal to 0.075 mm, accounting for more than 80%.

[0093] Comparative Example 2

[0094] Different from Example 3, the soil material does not contain fine-grained soil, but is replaced by soil of the first intermediate particle size of equal mass.

[0095] Comparative Example 3

[0096] Different from Example 3, the soil material does not contain the first intermediate-size soil, but is replaced by fine-grained soil of equal mass.

[0097] Comparative Example 4

[0098] Different from Example 3, the soil material does not contain the second intermediate-size soil, but is replaced by fine-grained soil of equal mass.

[0099] Comparative Example 5

[0100] Different from Example 3, the soil material does not contain coarse-grained soil, but is replaced by fine-grained soil of equal mass.

[0101] Comparative Example 6

[0102] The difference from Example 3 is that the stirring speed is maintained at 600 rpm and the stirring time is the same.

[0103] The properties of the liquid composite consolidated soil and its test blocks obtained in the test examples and comparative examples are shown in Table 1 below:

[0104] Table 1 Performance test results

[0105]

[0106] From Table 1 above, it can be seen from the comparison of Examples 1 to 10 that within the scope specified in this application, the lower the amount of soil used, the better the strength of the test block obtained, and the better the fluidity (this rule is not strictly followed in the test). It can be seen from the comparison of Example 3 and Example 11 that the use of a stabilizer can improve the settlement problem and enhance the strength of the test block. It can be seen from the comparison of Example 3 and Comparative Examples 1-5 that the soil is strictly divided into fine-grained soil, first intermediate-size soil, second intermediate-size soil, and coarse-grained soil, which has a significant impact on the improvement of the strength of the test block. It can be seen from the comparison of Example 3 and Comparative Example 6 that the stirring method provided in this application can improve the settlement problem and enhance the strength of the test block.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid composite consolidated soil, characterized in that: The raw materials are calculated by mass percentage, including: soil material 40%-90%, cementitious material 5%-40%, soil solidifier 0.01%-0.03%, accelerator 1%-10%, water reducer 0.01%-1%, stabilizer 1-3%, and the balance is water; The stabilizer is .

2. The liquid composite consolidated soil according to claim 1, characterized in that: The soil material is soil and / or slag obtained from engineering excavation and replacement.

3. The liquid composite consolidated soil according to claim 1, characterized in that: The soil material is calculated based on its own mass as 100%, including: 10-20% of fine-grained soil is 0.01mm-0.05mm, 20-40% of first intermediate-grained soil is greater than 0.05mm and less than or equal to 0.1mm, 30-50% of second intermediate-grained soil is greater than 0.1mm and less than or equal to 0.2mm, and 10-20% of coarse-grained soil is greater than 0.2mm and less than or equal to 1mm.

4. The liquid composite consolidated soil according to claim 1, characterized in that: The cementitious material includes one or more of cement, fly ash and lime.

5. The liquid composite consolidated soil according to claim 1, characterized in that: The soil curing agent includes one or more of epoxy curing agent, ionic curing agent, microbial curing agent, inorganic curing agent and biological enzyme curing agent; The quick-setting agent includes sodium silicate and / or potassium silicate; The water reducer includes a naphthalene-based water reducer and / or a polycarboxylic acid water reducer.

6. A method for preparing the liquid composite consolidated soil according to any one of claims 1 to 5, characterized in that: include: The raw materials are mixed and stirred to obtain the liquid composite consolidated soil.

7. The method for preparing liquid composite consolidated soil according to claim 6, characterized in that: The stirring comprises: First, stir for 0.5-1.5 min at 1000-1500 rpm, then stir for 1-2 min at 500-800 rpm, and then stir for 1-3 min at 100-300 rpm.

8. The method for preparing liquid composite consolidated soil according to claim 7, characterized in that: The stabilizer is added during the third stirring.

9. The method for preparing liquid composite consolidated soil according to any one of claims 6 to 8, characterized in that: The liquid composite consolidated soil meets one or more of the following conditions: (1) Fluidity 15 cm-30 cm; (2) Setting time: 3 to 8 hours; (3) 7-day unconfined compressive strength ≥ 0.5 MPa; (4) Unconfined compressive strength at 28 days ≥ 3 MPa.

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