Multi-element solid waste foam light soil and application

Abstract

The invention relates to the technical field of roadbed engineering, and provides multi-element solid waste foam light soil and application thereof.The multi-element solid waste foam light soil is prepared from, by weight, 60-80 parts of red mud, 25-35 parts of blast furnace slag, 10-20 parts of steel slag, 20-30 parts of cement, 1.5-3 parts of sodium silicate, 5-8 parts of zinc hydroxide, 5-8 parts of modified glass fiber, 60-80 parts of water, 8-10 parts of foaming agent and 0.6-0.8 part of water reducing agent; the modified glass fibers are obtained by coating glass fibers with magnesium hydroxide. According to the technical scheme, the problem that the strength of the multi-element solid waste foam light soil is poor in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of roadbed engineering, in particular, relates to a multi-element solid waste foam light soil and application. BACKGROUND

[0002] A large number of piled solid wastes lead to waste of resources and pollution of the environment, and comprehensive utilization of solid wastes is imminent. Foam light material, as a new type of building material, has excellent properties such as porosity, light weight, adjustable density and strength, convenient construction, and self-standing after hardening, and can reduce additional stress and settlement, cracks and other diseases of the foundation, and is widely used in road engineering. However, the strength of foam light soil itself often cannot meet the needs of high load scenes. At present, glass fibers are often added to the slurry to improve the mechanical properties, but the interfacial compatibility of glass fibers and solid wastes (such as slag) is poor, and fiber agglomeration is easily formed due to uneven dispersion; such agglomeration not only cannot play a reinforcing role, but also can form "structural weak spots" in the light soil, leading to a decrease in local strength, and even affect the overall structural stability in severe cases. Therefore, a high-strength multi-element solid waste foam light soil is urgently needed. SUMMARY

[0003] The present application provides a multi-element solid waste foam light soil and application, which solves the problem of poor strength of multi-element solid waste foam light soil in the related art.

[0004] The technical scheme of the present application is as follows: The present application provides a multi-element solid waste foam light soil, which comprises the following raw materials by weight: 60-80 parts of red mud, 25-35 parts of blast furnace slag, 10-20 parts of steel slag, 20-30 parts of cement, 1.5-3 parts of sodium silicate, 5-8 parts of zinc hydroxide, 5-8 parts of modified glass fiber, 60-80 parts of water, 8-10 parts of foaming agent, and 0.6-0.8 parts of water reducing agent. The modified glass fiber is obtained by coating glass fiber with magnesium hydroxide.

[0005] As a further technical scheme, the preparation method of the modified glass fiber comprises the following steps: A1, the glass fiber is acid washed, water washed and dried to obtain acid-treated glass fiber; A2, dispersing the acid-treated glass fiber in water to obtain a suspension, adding a coating agent to the suspension according to the coating amount, adjusting the pH to 9-10, and performing a coating reaction, and then filtering and drying to obtain the modified glass fiber.

[0006] As a further technical scheme, the coating amount is 40wt%-50wt%; The coating agent is a MgCl2 solution and a NaOH solution; The concentration of the MgCl2 solution is 0.15-0.18 mol / L; and the concentration of the NaOH solution is 0.3-0.35 mol / L.

[0007] As a further technical solution, the concentration of the MgCl2 solution is 0.15 mol / L; and the concentration of the NaOH solution is 0.3 mol / L.

[0008] As a further technical solution, the mass ratio of the acid-treated glass fiber and water is 1:5.

[0009] As a further technical solution, the temperature of the coating reaction is 80-90 DEG C, and the time is 80-90 min.

[0010] As a further technical solution, the foaming agent comprises one or both of a protein foaming agent and sodium dodecyl sulfonate.

[0011] As a further technical solution, the water reducing agent comprises one or both of a naphthalene series water reducing agent and a polycarboxylic acid series water reducing agent.

[0012] As a further technical solution, the zinc hydroxide is modified zinc hydroxide. The preparation method of the modified zinc hydroxide comprises the following steps: dispersing zinc hydroxide in water to obtain a zinc hydroxide slurry; adding formaldehyde and melamine into the slurry to perform a polymerization reaction, filtering, and drying, so that melamine resin is coated on the surface of the zinc hydroxide as a wall material to obtain modified zinc hydroxide.

[0013] In the present application, the formaldehyde and melamine are in-situ polymerized on the surface of the zinc hydroxide to generate melamine resin-coated zinc hydroxide, which on the one hand makes the zinc hydroxide more uniformly dispersed in the slurry, thereby improving the strength of the prepared multi-solid waste foam lightweight soil; and on the other hand, the melamine resin is introduced on the surface of the zinc hydroxide as a wall material, thereby improving the weather resistance of the prepared multi-solid waste foam lightweight soil.

[0014] As a further technical solution, the molar ratio of the formaldehyde and melamine is 1:2-3. The temperature of the polymerization reaction is 70-80 DEG C, and the time is 3-4 h. The mass fraction of the wall material is 15%-20%.

[0015] The present application further provides a preparation method of the multi-solid waste foam lightweight soil, which comprises the following steps: S1, stirring red mud, blast furnace slag, steel slag, cement, sodium silicate, zinc hydroxide, modified glass fiber and water to obtain a slurry; S2, diluting the foaming agent to prepare a foam, and adding the foam and the water reducing agent into the slurry, stirring, shaping, curing to obtain the multi-solid waste foam lightweight soil.

[0016] As a further technical solution, the dilution ratio of the foaming agent is 30-50 times.

[0017] The application also provides application of the multi-solid waste foam lightweight soil or the multi-solid waste foam lightweight soil prepared by the preparation method in roadbed fillers.

[0018] The working principle and beneficial effects of the application are as follows: In the application, the magnesium hydroxide is coated on the glass fiber to serve as the raw material of the foam lightweight soil, so that the mechanical strength of the foam lightweight soil is improved. Compared with the prior art of directly adding untreated glass fiber, the glass fiber coated with magnesium hydroxide improves the interfacial compatibility with the solid waste in the raw material, reduces the agglomeration phenomenon, and makes the glass fiber more uniformly dispersed in the slurry, so that the mechanical strength of the foam lightweight soil is improved. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are involved in the protection scope of the application.

[0020] In the following examples and comparative examples, the model of the protein foaming agent is HTW-1, and the manufacturer is Henan Huatai New Material Science and Technology Co., Ltd.; the model of the naphthalene series water reducing agent is SNF-B, and the manufacturer is Shenyang Xingzheng and Chemical Co., Ltd.; the model of the polycarboxylic acid series water reducing agent is TY-J25, and the manufacturer is Chongqing Tianyao Building Material Co., Ltd.; the red mud is Bayer red mud; the cement is Portland cement, and the model is PO 42.5 / R; the iron content in the steel slag is less than or equal to 2.0wt%; the blast furnace slag is slag powder not less than S95 grade; the length of the glass fiber is 6mm, and the diameter is 15μm.

[0021] Example 1 The preparation method of the modified glass fiber comprises the following steps: A1, placing the glass fiber in 0.3mol / L hydrochloric acid and ultrasonicating, then washing with water, and drying to obtain the acid-treated glass fiber; A2, the acid treated glass fiber is dispersed in 5 times mass of water, 0.15 mol / L MgCl2 solution and 0.3 mol / L NaOH solution are added according to 30% coating amount, and coating reaction is carried out at 80 DEG C for 90 min, pH is adjusted to 9, and after filtration and drying, modified glass fiber is obtained; The preparation method of the multi-solid waste foam lightweight soil comprises the following steps: S1, 60 parts of red mud, 25 parts of blast furnace slag, 10 parts of steel slag, 20 parts of cement, 1.5 parts of sodium silicate, 5 parts of zinc hydroxide, 5 parts of modified glass fiber and 60 parts of water are stirred and mixed to obtain a slurry; S2, 4 parts of protein foaming agent and 4 parts of sodium dodecyl sulfonate are mixed with water according to a dilution ratio of 30 times to prepare foam, and the foam, 0.3 parts of naphthalene water reducer and 0.3 parts of polycarboxylic acid water reducer are added into the obtained slurry, stirred, shaped and cured to obtain the multi-solid waste foam lightweight soil.

[0022] Example 2 The preparation method of the modified glass fiber comprises the following steps: A1, the glass fiber is ultrasonically treated in 0.3 mol / L hydrochloric acid, then washed with water and dried to obtain acid treated glass fiber; A2, the acid treated glass fiber is dispersed in 5 times mass of water, 0.15 mol / L MgCl2 solution and 0.3 mol / L NaOH solution are added according to 30% coating amount, and coating reaction is carried out at 80 DEG C for 90 min, pH is adjusted to 9, and after filtration and drying, modified glass fiber is obtained; The preparation method of the multi-solid waste foam lightweight soil comprises the following steps: S1, 60 parts of red mud, 25 parts of blast furnace slag, 10 parts of steel slag, 20 parts of cement, 1.5 parts of sodium silicate, 5 parts of zinc hydroxide, 5 parts of modified glass fiber and 60 parts of water are stirred and mixed to obtain a slurry; S2, 4 parts of protein foaming agent and 4 parts of sodium dodecyl sulfonate are mixed with water according to a dilution ratio of 30 times to prepare foam, and the foam, 0.3 parts of naphthalene water reducer and 0.3 parts of polycarboxylic acid water reducer are added into the obtained slurry, stirred, shaped and cured to obtain the multi-solid waste foam lightweight soil.

[0023] Example 3 The preparation method of the modified glass fiber comprises the following steps: A1, the glass fiber is ultrasonically treated in 0.3 mol / L hydrochloric acid, then washed with water and dried to obtain acid treated glass fiber; A2, the acid-treated glass fiber is dispersed in 5 times the mass of water, 0.15 mol / L MgCl2 solution and 0.3 mol / L NaOH solution are added according to a coating amount of 30%, and a coating reaction is carried out at 90 DEG C for 80 min, with the pH being adjusted to 10; after filtration and drying, the modified glass fiber is obtained; The application discloses a preparation method of multi-solid waste foam light soil. S1, 80 parts of red mud, 35 parts of blast furnace slag, 20 parts of steel slag, 30 parts of cement, 3 parts of sodium silicate, 8 parts of zinc hydroxide, 8 parts of modified glass fiber, and 80 parts of water are stirred and mixed to obtain a slurry; S2, 10 parts of sodium dodecyl sulfonate are mixed with water according to a dilution ratio of 50 times to prepare a foam, and the foam and 0.8 parts of a polycarboxylate superplasticizer are added into the obtained slurry, stirred, molded, and cured to obtain the multi-solid waste foam light soil.

[0024] Example 4 The difference between the example and example 3 is that, in the preparation of the modified glass fiber, 0.15 mol / L MgCl2 solution and 0.3 mol / L NaOH solution are added according to a coating amount of 40%.

[0025] Example 5 The difference between the example and example 3 is that, in the preparation of the modified glass fiber, 0.15 mol / L MgCl2 solution and 0.3 mol / L NaOH solution are added according to a coating amount of 45%.

[0026] Example 6 The difference between the example and example 3 is that, in the preparation of the modified glass fiber, 0.15 mol / L MgCl2 solution and 0.3 mol / L NaOH solution are added according to a coating amount of 50%.

[0027] Example 7 The difference between the example and example 3 is that, in the preparation of the modified glass fiber, 0.15 mol / L MgCl2 solution and 0.3 mol / L NaOH solution are added according to a coating amount of 60%.

[0028] Example 8 The difference between the example and example 5 is that the modified zinc hydroxide is used instead of the zinc hydroxide, and the preparation method of the modified zinc hydroxide comprises the following steps: the zinc hydroxide is dispersed in water to obtain a slurry with a zinc hydroxide content of 9 wt%; formaldehyde and melamine are added into the slurry according to a molar ratio of 1:2, and the mass fraction of the wall material is 15% at this time; a polymerization reaction is carried out at 70 DEG C for 4 h; after filtration and drying, the modified zinc hydroxide is obtained.

[0029] Example 9 The difference between this example and Example 5 is only that the zinc hydroxide is replaced by modified zinc hydroxide, and the preparation method of the modified zinc hydroxide comprises the following steps: dispersing zinc hydroxide in water to obtain a slurry with a zinc hydroxide content of 9wt%; adding formaldehyde and melamine according to a molar ratio of 1:3 to the slurry, and at this time the mass fraction of the wall material is 20%, and the polymerization reaction is carried out at 80°C, the reaction time is 3h, and after filtration and drying, the modified zinc hydroxide is obtained.

[0030] Comparative Example 1 The difference between this example and Example 3 is only that the modified glass fiber is replaced by glass fiber during the preparation of the multi-solid waste foam lightweight soil.

[0031] Experimental Example 1 The mechanical properties of the multi-solid waste foam lightweight soil prepared in Examples 1-9 and Comparative Example 1 were tested respectively: Compressive strength: tested according to the method of GB / T 11969-2020 "Autoclaved Aerated Concrete Performance Test Method", and the compressive strength test machine was used to compress the lightweight soil cubic test block (100mm×100mm×100mm) cured for 28d to determine the compressive strength.

[0032] The results are shown in Table 1 below.

[0033] Table 1 Mechanical property test results

[0034] By comparing the data of Example 3 and Comparative Example 1, the compressive strength of the multi-solid waste foam lightweight soil prepared by coating the glass fiber with magnesium hydroxide in Example 3 is significantly higher than that of Comparative Example 1, which shows that coating the glass fiber with magnesium hydroxide can significantly improve the mechanical strength of the prepared multi-solid waste foam lightweight soil.

[0035] By comparing the data of Examples 3-7, the compressive strength of the multi-solid waste foam lightweight soil prepared by using modified glass fiber with a coating amount of 40%-50% in Examples 4-6 is higher than that of Examples 3 and 7, which shows that by adjusting the coating amount of magnesium hydroxide on the glass fiber, the mechanical strength of the prepared multi-solid waste foam lightweight soil can be further improved.

[0036] By comparing the data of Example 5 and Examples 8-9, the compressive strength of the multi-solid waste foam lightweight soil prepared by using modified zinc hydroxide in Experimental Examples 8-9 is significantly improved compared with Example 5, which shows that by using modified zinc hydroxide, the mechanical strength of the prepared multi-solid waste foam lightweight soil can be significantly improved.

[0037] Experimental Example 2 The weather resistance of the multi-solid waste foam lightweight soil prepared in Examples 1-3 and Experimental Examples 8-9 was tested respectively: Freeze-thaw test: The 28d-cured lightweight soil cubic test blocks (100mmx100mmx100mm) were tested according to the method of GB / T11969-2020 "Autoclaved Aerated Concrete Performance Test Method", the compressive strength of the test blocks before and after freeze-thaw test was recorded (the compressive strength of the test blocks before freeze-thaw test was the same as that of Experimental Example 1), and the compressive strength loss was calculated.

[0038] Table 2 Weather resistance test results

[0039] By comparing the data of Examples 1-3 and Examples 8-9, the compressive strength loss of the multi-solid waste foam lightweight soil prepared by using modified zinc hydroxide in Examples 8-9 was significantly lower than that of Examples 1-3, indicating that the weather resistance of the prepared multi-solid waste foam lightweight soil can be significantly improved by using modified zinc hydroxide.

[0040] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-element solid waste foam lightweight soil, characterized in that, The raw materials include the following parts by weight: 60-80 parts red mud, 25-35 parts blast furnace slag, 10-20 parts steel slag, 20-30 parts cement, 1.5-3 parts sodium silicate, 5-8 parts zinc hydroxide, 5-8 parts modified glass fiber, 60-80 parts water, 8-10 parts foaming agent, and 0.6-0.8 parts water-reducing agent; The modified glass fiber is obtained by coating glass fiber with magnesium hydroxide.

2. The multi-element solid waste foam lightweight soil according to claim 1, characterized in that, The method for preparing the modified glass fiber includes the following steps: A1. Glass fiber is acid-treated, washed with water, and then dried to obtain acid-treated glass fiber. A2. Disperse the acid-treated glass fiber in water to obtain a suspension. Add a coating agent dropwise to the suspension according to the coating amount, adjust the pH to 9-10, carry out the coating reaction, filter and dry to obtain modified glass fiber.

3. The multi-element solid waste foam lightweight soil according to claim 2, characterized in that, The coating amount is 40wt%~50wt%; The coating agent is a MgCl2 solution and a NaOH solution; The concentration of the MgCl2 solution is 0.15~0.18 mol / L; the concentration of the NaOH solution is 0.3~0.35 mol / L.

4. The multi-element solid waste foam lightweight soil according to claim 2, characterized in that, The coating reaction is carried out at a temperature of 80-90°C for 80-90 minutes.

5. The multi-element solid waste foam lightweight soil according to claim 1, characterized in that, The foaming agent includes one or both of protein foaming agents and sodium dodecyl sulfonate.

6. The multi-element solid waste foam lightweight soil according to claim 1, characterized in that, The water-reducing agent includes one or both of naphthalene-based and polycarboxylate-based water-reducing agents.

7. The multi-element solid waste foam lightweight soil according to claim 1, characterized in that, The zinc hydroxide is modified zinc hydroxide; The method for preparing the modified zinc hydroxide includes the following steps: dispersing zinc hydroxide in water to obtain a zinc hydroxide slurry; adding formaldehyde and melamine to the slurry for polymerization reaction; filtering and drying; and then coating the surface of the zinc hydroxide with melamine resin as a wall material to obtain modified zinc hydroxide.

8. The multi-element solid waste foam lightweight soil according to claim 7, characterized in that, The molar ratio of formaldehyde to melamine is 1:2~3; The polymerization reaction is carried out at a temperature of 70-80°C for 3-4 hours. The wall material has a mass fraction of 15% to 20%.

9. A method for preparing a multi-element solid waste foam lightweight soil, used to prepare the multi-element solid waste foam lightweight soil according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Red mud, blast furnace slag, steel slag, cement, sodium silicate, zinc hydroxide, modified glass fiber, and water are mixed to obtain a slurry. S2. The foaming agent is diluted to prepare foam, and the foam and water-reducing agent are added to the slurry. After stirring, molding and curing, multi-element solid waste foam lightweight soil is obtained.

10. The application of the multi-element solid waste foamed lightweight soil according to any one of claims 1 to 8 or the multi-element solid waste foamed lightweight soil prepared by the preparation method according to claim 9 in roadbed filler.

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