Soil stabilizer prepared from industrial solid waste as well as preparation method and application of soil stabilizer

Abstract

The invention discloses a soil stabilizer prepared from industrial solid waste. The soil stabilizer comprises the following components in parts by weight: 25-45 parts of cement; 35 to 45 parts of slag; 10 to 20 parts of fly ash; 6 to 15 parts of gypsum; 1-5 parts of methyl hydrogen-containing silicone oil emulsion; 1 to 5 parts of hydroxymethyl acrylamide; compared with the prior art, the soil stabilizer has the advantages that the methyl hydrogen-containing silicone oil emulsion and hydroxymethyl acrylamide are added for a copolymerization reaction, active groups are introduced, and a cross-linked structure is formed, so that the water resistance of stabilized soil is improved by the soil stabilizer.

Description

Technical Field

[0001] The invention relates to the technical field of soil solidifiers, and in particular to a soil solidifier prepared from industrial solid waste, and a preparation method and application thereof. Background Art

[0002] Solid waste is called "precious resources placed in the wrong place". At a time when high-quality resources are becoming increasingly depleted, research on the rational use of solid waste can effectively alleviate the pressure of resource depletion, and at the same time fundamentally solve the environmental problems caused by the stacking of solid waste.

[0003] In the current research on soil solidifiers, solid waste is added. For example, CN115417652B discloses a soil solidifier based on silt solid waste in the Yellow River flooding area, which is made of the following components in parts by weight: 25-40 parts of blast furnace slag, 25-50 parts of fly ash, 2-15 parts of desulfurized gypsum, 5-15 parts of titanium gypsum, 25-40 parts of ordinary Portland cement, diethanol monoisopropanolamine, whose weight part is 1 / 10,000 to 18 / 10,000 of the total dry mass of all powders, and surfactant, whose weight part is 1-10% of the total dry mass of all powders.

[0004] Although the above-mentioned soil solidifier recycles solid waste such as blast furnace slag, and the solid waste materials and cement work together to improve the strength of the solidified soil, it has poor water resistance. After use, the solidified soil is easily broken by rainwater, which affects the solidification effect. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a soil solidifier prepared from industrial solid waste and a preparation method and application thereof, so as to solve the problem of poor water resistance of the soil solidifier in the prior art.

[0006] To achieve the above object, the first aspect of the present invention adopts the following technical solution: a soil solidifying agent prepared from industrial solid waste, comprising the following components calculated by weight:

[0007]

[0008]

[0009] The optimized one includes the following components calculated by weight:

[0010]

[0011] The optimized one includes the following components calculated by weight:

[0012]

[0013] Optimally, the particle size of the slag is not greater than 0.32 mm.

[0014] Optimally, the particle size of the fly ash is not greater than 300 meshes.

[0015] Optimally, the particle size of the gypsum is not greater than 0.32 mm.

[0016] Preferably, the cement is ordinary Portland cement.

[0017] The second aspect of the present invention adopts the following technical solution: a method for preparing a soil solidifying agent prepared from industrial solid waste as described in the first aspect of the present invention, characterized in that it comprises the following steps:

[0018] The slag, fly ash and gypsum are dried, ground and sieved in turn;

[0019] Weigh the treated slag, fly ash and gypsum as well as cement, methyl hydrogen silicone oil emulsion and hydroxymethyl acrylamide in proportion, then mix the slag, fly ash, gypsum and cement evenly, and then add methyl hydrogen silicone oil emulsion and hydroxymethyl acrylamide to mix evenly.

[0020] The third aspect of the present invention adopts the following technical solution: use of a soil solidifying agent prepared from industrial solid waste as described in the first aspect of the present invention in soil solidification.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The soil solidifying agent prepared by the present invention reduces the amount of cement used as a solidifying agent, and can reduce environmental pollution caused by cement production;

[0023] 2. The present invention reduces the amount of traditional curing agents such as cement, which can reduce the cost of road construction;

[0024] 3. The present invention comprehensively utilizes industrial solid wastes such as slag, fly ash and gypsum to reduce waste discharge and environmental pollution;

[0025] 4. In the present invention, by adding methyl hydrogen silicone oil emulsion and hydroxymethyl acrylamide to undergo copolymerization, active groups are introduced and a cross-linked structure is formed, so that the soil solidifier improves the water resistance of the solidified soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The soil solidifier prepared in Example 3 has an effect on the splitting strength at different curing ages with the dosage as the independent variable. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below through specific embodiments:

[0028] Example 1

[0029] Preparation of soil stabilizer made from industrial solid waste:

[0030] The slag, fly ash and gypsum are first dried in an oven at a drying temperature of 50°C, and the dried slag, fly ash and gypsum are ground in a planetary ball mill and then sieved respectively; wherein the particle size of the slag is not greater than 0.32 mm, the particle size of the gypsum is not greater than 0.32 mm, and the particle size of the fly ash is not greater than 300 meshes;

[0031] Weigh 25 parts of slag, 10 parts of fly ash, 6 parts of gypsum, 35 parts of ordinary Portland cement, 1 part of methyl hydrogen silicone oil emulsion and 1 part of hydroxymethyl acrylamide, then add the slag, fly ash, gypsum and ordinary Portland cement into a mixer and mix them evenly, then add the methyl hydrogen silicone oil emulsion and hydroxymethyl acrylamide and mix them evenly;

[0032] Finally, the evenly mixed mixture is packed in bags.

[0033] Example 2

[0034] Preparation of soil stabilizer made from industrial solid waste:

[0035] The slag, fly ash and gypsum are first dried in an oven at a drying temperature of 50°C, and the dried slag, fly ash and gypsum are ground in a planetary ball mill and then sieved respectively; wherein the particle size of the slag is not greater than 0.32 mm, the particle size of the gypsum is not greater than 0.32 mm, and the particle size of the fly ash is not greater than 300 meshes;

[0036] Weigh 44 parts of slag, 15 parts of fly ash, 11 parts of gypsum, 30 parts of ordinary Portland cement, 2 parts of methyl hydrogen silicone oil emulsion and 3 parts of hydroxymethyl acrylamide, then add the slag, fly ash, gypsum and ordinary Portland cement into a mixer and mix them evenly, then add the methyl hydrogen silicone oil emulsion and hydroxymethyl acrylamide and mix them evenly;

[0037] Finally, the evenly mixed mixture is packed in bags.

[0038] Example 3

[0039] Preparation of soil stabilizer made from industrial solid waste:

[0040] The slag, fly ash and gypsum are first dried in an oven at a drying temperature of 50°C, and the dried slag, fly ash and gypsum are ground in a planetary ball mill and then sieved respectively; wherein the particle size of the slag is not greater than 0.32 mm, the particle size of the gypsum is not greater than 0.32 mm, and the particle size of the fly ash is not greater than 300 meshes;

[0041] Weigh 38 parts of slag, 13 parts of fly ash, 9 parts of gypsum, 40 parts of ordinary Portland cement, 1 part of methyl hydrogen silicone oil emulsion and 2 parts of hydroxymethyl acrylamide, then add the slag, fly ash, gypsum and ordinary Portland cement into a mixer and mix them evenly, then add the methyl hydrogen silicone oil emulsion and hydroxymethyl acrylamide and mix them evenly;

[0042] Finally, the evenly mixed mixture is packed in bags.

[0043] Example 4

[0044] Preparation of soil stabilizer made from industrial solid waste:

[0045] The slag, fly ash and gypsum are first dried in an oven at a drying temperature of 50°C, and the dried slag, fly ash and gypsum are ground in a planetary ball mill and then sieved respectively; wherein the particle size of the slag is not greater than 0.32 mm, the particle size of the gypsum is not greater than 0.32 mm, and the particle size of the fly ash is not greater than 300 meshes;

[0046] Weigh 45 parts of slag, 20 parts of fly ash, 15 parts of gypsum, 45 parts of ordinary Portland cement, 5 parts of methyl hydrogen silicone oil emulsion and 5 parts of hydroxymethyl acrylamide, then add the slag, fly ash, gypsum and ordinary Portland cement into a mixer and mix them evenly, then add the methyl hydrogen silicone oil emulsion and hydroxymethyl acrylamide and mix them evenly;

[0047] Finally, the evenly mixed mixture is packed in bags.

[0048] The soil solidifiers prepared in Examples 1 to 4 were used to measure the unconfined compressive strength of the solidified soil in accordance with JTG 3430-2020 "Highway Geotechnical Test Code", and the data shown in Table 1 were obtained.

[0049]

[0050] Table 1

[0051] It can be seen from Table 1 that: under the same dosage, the strength of the stabilized soil gradually increases with the increase of age, and the strength development is relatively slow after 28 days.

[0052] Comparative Example 1

[0053] The only difference from Example 3 is that no methyl hydrogen silicone oil emulsion and hydroxymethyl acrylamide are added.

[0054] Comparative Example 2

[0055] The only difference from Example 3 is that 1 part of methyl hydrogen silicone oil emulsion and 2 parts of hydroxymethyl acrylamide are replaced by 3 parts of methyl hydrogen silicone oil emulsion.

[0056] Comparative Example 3

[0057] The only difference from Example 3 is that 1 part of methyl hydrogen silicone oil emulsion and 2 parts of hydroxymethyl acrylamide are replaced by 3 parts of hydroxymethyl acrylamide.

[0058] The soil solidifier prepared in Comparative Examples 1 to 3 was added in an amount of 4% (mass percentage) and the unconfined compressive strength of the solidified soil was measured in accordance with JTG3430-2020 "Highway Geotechnical Test Code", and the data shown in Table 2 were obtained.

[0059] Group 7d unconfined compressive strength / MPa Comparative Example 1 0.82 Comparative Example 2 1.06 Comparative Example 3 1.09

[0060] Table 2

[0061] The soil solidifiers prepared in Examples 1 to 4 and Comparative Examples 1 to 3 were added in an amount of 4% (mass percentage) to determine the CBR value of the solidified soil in accordance with JTG 3430-2020 "Highway Geotechnical Test Code", and the data shown in Table 3 were obtained.

[0062]

[0063]

[0064] Table 3

[0065] The soil solidifiers prepared in Examples 1 to 4 and Comparative Examples 1 to 3 were tested for water absorption rate after 7 days of immersion in water at a dosage of 4% (mass percentage) in accordance with the "Testing Procedure for Stabilized Materials of Inorganic Binders for Highway Engineering (JTGE51-2009)". The test results are shown in Table 4.

[0066] Group 7-day water absorption rate (%) Undisturbed soil 86 Example 1 19 Example 2 16 Example 3 14 Example 4 21 Comparative Example 1 45 Comparative Example 2 28 Comparative Example 3 26

[0067] Table 4

[0068] From Tables 1 to 4, it can be seen that the soil solidifier prepared by the present invention can significantly improve the structural strength and water resistance of the soil, and the formula in Example 3 is relatively optimal.

[0069] The soil solidifier prepared in Example 3 was analyzed with dosage as the independent variable to determine the effect of the splitting strength at different curing ages. Figure 1It can be seen that the splitting strength increases with the increase of the amount of soil stabilizer.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A soil solidifying agent prepared from industrial solid waste, characterized in that: The following components are included in parts by weight: 25-45 parts of cement; 35-45 parts of slag; 10-20 parts of fly ash; 6-15 parts of gypsum; 1-5 parts of methyl hydrogen silicone oil emulsion; 1-5 parts of hydroxymethyl acrylamide.

2. The soil solidifying agent prepared from industrial solid waste according to claim 1, characterized in that: The following components are included in parts by weight: 30 parts of cement; 44 parts of slag; 15 parts of fly ash; 11 parts of gypsum; 2 parts of methyl hydrogen silicone oil emulsion; 3 parts of hydroxymethyl acrylamide.

3. The soil solidifying agent prepared from industrial solid waste according to claim 1, characterized in that: The following components are included in parts by weight: 40 parts of cement; 38 parts of slag; 13 parts of fly ash; 9 parts of gypsum; 1 part of methyl hydrogen silicone oil emulsion; 2 parts of hydroxymethyl acrylamide.

4. The soil solidifying agent prepared from industrial solid waste according to any one of claims 1 to 3, characterized in that: The particle size of the slag is not greater than 0.32 mm.

5. The soil solidifying agent prepared from industrial solid waste according to any one of claims 1 to 3, characterized in that: The particle size of the fly ash is not greater than 300 meshes.

6. The soil solidifying agent prepared from industrial solid waste according to any one of claims 1 to 3, characterized in that: The particle size of the gypsum is not greater than 0.32 mm.

7. The soil solidifying agent prepared from industrial solid waste according to any one of claims 1 to 3, characterized in that: The cement is ordinary Portland cement.

8. A method for preparing a soil solidifying agent prepared from industrial solid waste according to any one of claims 1 to 7, characterized in that: The following steps are involved: The slag, fly ash and gypsum are dried, ground and sieved in turn; Weigh the treated slag, fly ash and gypsum as well as cement, methyl hydrogen silicone oil emulsion and hydroxymethyl acrylamide in proportion, then mix the slag, fly ash, gypsum and cement evenly, and then add methyl hydrogen silicone oil emulsion and hydroxymethyl acrylamide to mix evenly.

9. Use of a soil solidifying agent prepared from industrial solid waste according to any one of claims 1 to 7 in soil solidification.

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