Bi-component inorganic curing agent suitable for curing problem soil and application of bi-component inorganic curing agent

Abstract

The invention relates to the field of curing treatment of problematic soil, in particular to a bi-component inorganic curing agent suitable for curing problematic soil and application of the bi-component inorganic curing agent. A conditioning agent composed of a soil stabilizer, an ion exchange material and a micro-nano reinforcing material is used as a component B, and a use mode is formed by four treatment steps of soil pretreatment, curing agent addition, stirring and mixing and land maintenance. Compared with the prior art, the soil stabilizer has the advantages that the main body part of the soil stabilizer is recycled from industrial waste, other added parts such as aluminum sulfate and bentonite are adopted, the cost is low, the cost performance is high, the cost is reduced by 20-40% compared with that of a traditional method, the component A can provide a gelling effect, the component B can regulate the soil property and enhance the curing effect, and the soil stabilizer is suitable for large-scale popularization and application. And the corresponding construction process is simple and is very environment-friendly.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of solidification treatment of problem soil, in particular to a two-component inorganic solidification agent suitable for solidifying problem soil and application thereof. BACKGROUND

[0002] Problem soil (such as soft soil, expansive soil, contaminated soil, etc.) often needs to be solidified in engineering construction to improve engineering performance;

[0003] In road construction, roadbed reinforcement, building engineering to ensure the stability of the foundation, environmental protection, contaminated soil remediation and other fields, solidification agent is needed to treat loose soil;

[0004] Traditional solidification agents (such as cement, lime) have limited solidification effect, high cost or environmental unfriendliness, etc. Therefore, a two-component inorganic solidification agent suitable for solidifying problem soil and application thereof are provided. SUMMARY

[0005] (I) Technical problems to be solved

[0006] The technical problem to be solved by the present application is that the solidification agent for solidifying problem soil has limited solidification effect and poor durability.

[0007] (II) Technical solutions

[0008] To solve the above technical problems, the technical solutions provided by the present application are as follows: a two-component inorganic solidification agent suitable for solidifying problem soil and application thereof, comprising:

[0009] The A component as the main solidification agent and the B component as the functional regulator are added to the soil in proportion, and after mixing, the soil is solidified.

[0010] The A component includes industrial waste residue-based cementitious material, active activator and auxiliary gel material.

[0011] The B component includes soil stabilizer, ion exchange material and micro-nano enhanced material.

[0012] A two-component inorganic solidification agent suitable for solidifying problem soil and application thereof further comprises:

[0013] Step 1: soil pretreatment;

[0014] Step 2: solidification agent addition;

[0015] Step 3: mixing;

[0016] Step 4: land maintenance.

[0017] As an improvement, the industrial waste residue-based cementing material adopts 75-85% of slag and 15-25% of fly ash, and the proportion in the A component is 50-80%.

[0018] As an improvement, the active activator adopts a low-concentration sodium hydroxide solution, and the proportion in the A component is 5-15%.

[0019] As an improvement, the auxiliary gel material adopts a metakaolin doped with magnesium oxide, and the proportion in the A component is 10-20%.

[0020] As an improvement, the soil stabilizer adopts a mixture of aluminum sulfate, magnesium chloride, calcium formate, and sodium silicate, and the proportion in the B component is 30-50%.

[0021] As an improvement, the ion exchange material adopts bentonite, and the proportion in the B component is 20-40%.

[0022] As an improvement, the micro-nano level reinforcing material adopts nano-sized silicon dioxide or nano-sized calcium carbonate, and the proportion in the B component is 10-30%.

[0023] As an improvement, step 1 is to crush and screen the soil to be treated to a particle size of <5mm for soil pretreatment, and the moisture content of the treated soil is controlled at 15-25%.

[0024] As an improvement, step 2 is to add the A component in an amount of 3-8% of the dry soil weight and the B component in an amount of 1-3% of the dry soil weight to the pretreated soil.

[0025] As an improvement, step 3 uses mechanical stirring and related equipment to mix the pretreated soil, the A component-containing additive, and the B component-containing additive with each other, and the mixing processing time is ≥5 minutes.

[0026] As an improvement, step 4 is to spread the well-mixed soil containing the solidifying agent back to the ground, and to maintain it in an environment with a normal temperature and a relative humidity ≥90% for 7-28 days.

[0027] (Three), beneficial effects

[0028] Compared with the prior art, the soil solidifying agent has the advantages that the main part of the soil solidifying agent adopts industrial waste recycling, other added parts have low cost and high performance-price ratio, the strength is improved by 20-40% compared with traditional methods, the A component can provide gelation, the B component can adjust soil properties and enhance solidification effect, the corresponding construction process is simple, and the environment is very friendly. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of the composition of a two-component inorganic solidifying agent suitable for solidifying problem soil.

[0030] Figure 2 is a flowchart of the application steps of the two-component inorganic curing agent suitable for curing problem soil. DETAILED DESCRIPTION

[0031] The application will be further described in detail below with reference to the accompanying drawings.

[0032] Example 1

[0033] To solve the above technical problems, the technical solution provided by the application is: a two-component inorganic curing agent suitable for curing problem soil and its application, combined with the Figure 1 It comprises A component as the main curing agent and B component as the functional regulator, both of which are added to the soil in proportion, and after mutual mixing, the soil curing treatment is realized;

[0034] The A component comprises industrial waste residue-based cementitious material, active activator and auxiliary gel material;

[0035] The industrial waste residue-based cementitious material uses 75-85% of slag and 15-25% of fly ash, and accounts for 50-80% in the A component;

[0036] The active activator uses a low-concentration sodium hydroxide solution, and accounts for 5-15% in the A component;

[0037] The auxiliary gel material uses metakaolin doped with magnesium oxide, and accounts for 10-20% in the A component;

[0038] The B component comprises soil stabilizer, ion exchange material and micro-nano enhanced material;

[0039] The soil stabilizer uses a mixture of aluminum sulfate, magnesium chloride, calcium formate and sodium silicate, and accounts for 30-50% in the B component;

[0040] The ion exchange material uses bentonite, and accounts for 20-40% in the B component;

[0041] The micro-nano enhanced material uses nano-sized silicon dioxide or nano-sized calcium carbonate, and accounts for 10-30% in the B component;

[0042] A two-component inorganic curing agent suitable for curing problem soil and its application, combined with the Figure 2 It also comprises the following processing steps:

[0043] Step 1: The soil to be treated is crushed and sieved to a particle size of <5mm for soil pretreatment, and the moisture content of the treated soil is controlled at 15-25%;

[0044] Step two: add A component with 3-8% of dry soil weight, and add 1-3% of B component with dry soil weight into the pretreated soil;

[0045] Step three: mix the pretreated soil, the additive containing A component, and the additive containing B component by mechanical stirring and related equipment, and the mixing time is greater than or equal to 5 minutes;

[0046] Step four: spread the mixed soil containing the solidifying agent back to the ground, and maintain for 7-28 days in an environment with normal temperature and relative humidity greater than or equal to 90%.

[0047] In the specific implementation of the present application, first, various substrates and base fluids are purchased and prepared, and A component materials and B component materials are respectively prepared in appropriate proportions;

[0048] Secondly, the soil to be solidified is crushed and screened by related equipment and tools to obtain pretreated soil;

[0049] Then, the pretreated soil, A component materials and B component materials are put into a stirring equipment for mixing in a certain relative ratio based on the soil addition amount.

[0050] The mixed soil is filled back to the ground for maintenance, the humidity in the maintenance environment is kept above 90% at normal temperature, and finally the soil solidification treatment work is completed after waiting for 7-28 days.

[0051] The above describes the present application and its embodiments, which is not limited, and the drawings only show one of the embodiments of the present application, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired by it, without departing from the purpose of the present application, similar structure and embodiments can be designed without creative design, which should belong to the protection scope of the present application.

Claims

1. A two-component inorganic solidifying agent suitable for solidifying problematic soils and its application, characterized in that, include: Component A, as the main solidifying agent, and component B, as the functional regulator, are added to the soil in proportion. After the three are mixed together, the soil is solidified. Component A includes industrial waste-based cementitious materials, active activators, and auxiliary gelling materials; Component B includes soil stabilizers, ion exchange materials, and micro / nano-scale reinforcing materials; A two-component inorganic solidifying agent suitable for solidifying problem soils and its applications, further comprising: Step 1: Soil pretreatment; Step 2: Adding the curing agent; Step 3: Stir and mix; Step 4: Land maintenance.

2. The two-component inorganic solidifying agent suitable for solidifying problematic soil according to claim 1, characterized in that: The industrial waste-based cementitious material contains 75-85% slag and 15-25% fly ash, accounting for 50-80% of component A.

3. The two-component inorganic solidifying agent suitable for solidifying problematic soil according to claim 1, characterized in that: The active activator is a low-concentration sodium hydroxide solution, accounting for 5-15% of component A.

4. The two-component inorganic solidifying agent suitable for solidifying problematic soil according to claim 1, characterized in that: The auxiliary gel material is metakaolin doped with magnesium oxide, accounting for 10-20% of component A.

5. The two-component inorganic solidifying agent suitable for solidifying problematic soil according to claim 1, characterized in that: The soil stabilizer is a mixture of aluminum sulfate, magnesium chloride, calcium formate, and sodium silicate, accounting for 30-50% of component B.

6. The two-component inorganic solidifying agent suitable for solidifying problematic soil according to claim 1, characterized in that: The ion exchange material is bentonite, which accounts for 20-40% of component B.

7. The two-component inorganic solidifying agent suitable for solidifying problematic soil according to claim 1, characterized in that: The micro-nano-scale reinforcing material is made of nano-scale silicon dioxide or nano-scale calcium carbonate, accounting for 10-30% of component B.

8. A two-component inorganic solidifying agent suitable for solidifying problematic soils according to claims 1-7 and its application, characterized in that: In step 1, the soil to be treated is crushed and screened to a particle size of <5mm for soil pretreatment. After treatment, the soil moisture content is controlled at 15-25%.

9. A two-component inorganic solidifying agent suitable for solidifying problematic soils according to claim 8, and its application therein, characterized in that: In step 2, component A, which is 3-8% of the dry soil weight, and component A, which is 1-3% of the dry soil weight, are added sequentially to the pretreated soil.

10. A two-component inorganic solidifying agent suitable for solidifying problematic soils according to claim 9, and its application therein, characterized in that: Step 3 uses mechanical mixing and related equipment to mix the pretreated soil, additives containing component A, and additives containing component B together, with a mixing time of ≥5 minutes.

11. A two-component inorganic solidifying agent suitable for solidifying problematic soils according to claim 10, and its application therein, characterized in that: In step 4, the thoroughly mixed soil containing the curing agent is thrown back onto the ground and cured for 7-28 days in an environment with normal temperature and relative humidity ≥90%.

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