Solid-waste-based corrosion-resistant cementing material and preparation method thereof

Abstract

The invention relates to the technical field of cementing materials, and provides a solid-waste-based corrosion-resistant cementing material and a preparation method thereof. The solid-waste-based corrosion-resistant cementing material comprises the following components in parts by weight: 40-60 parts of slag powder, 10-25 parts of steel slag powder, 10-20 parts of gypsum, 3-8 parts of calcium carbonate powder, 3-8 parts of fly ash and 1-5 parts of an exciting agent, the fly ash is modified fly ash; the modified fly ash is prepared from the following raw materials: fly ash, 3-cyclohexylaminophenol and polyvinyl alcohol. According to the technical scheme, the problem that in the prior art, a solid-waste-based corrosion-resistant cementing material is insufficient in toughness and corrosion resistance is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cementitious materials, in particular, to a solid waste-based corrosion-resistant cementitious material. BACKGROUND

[0002] Steel slag and slag, as industrial solid wastes with huge emissions, their treatment problems are increasingly prominent, extensive stacking not only occupies a large amount of land, but also may cause environmental pollution. At the same time, in the hydration products of traditional cement-based cementitious materials, the content of calcium hydroxide is high, and in the presence of corrosive medium, the corrosion resistance is poor, which is difficult to meet the current demand. In this case, the application of industrial solid wastes such as steel slag and slag in cementitious materials not only can reduce the environmental pollution problems caused by industrial solid wastes such as slag and steel slag, but also can avoid the problem of corrosion resistance caused by calcium hydroxide in the hydration products of traditional cement-based cementitious materials. Therefore, it is of great significance to propose a solid waste-based corrosion-resistant cementitious material. SUMMARY

[0003] The present application proposes a solid waste-based corrosion-resistant cementitious material, which solves the problem of insufficient corrosion resistance of the solid waste-based corrosion-resistant cementitious material in the prior art.

[0004] The technical scheme of the present application is as follows: The present application proposes a solid waste-based corrosion-resistant cementitious material, which includes the following components by weight: 40-60 parts of slag powder, 10-25 parts of steel slag powder, 10-20 parts of gypsum, 3-8 parts of calcium carbonate powder, 3-8 parts of fly ash, and 1-5 parts of activator; the fly ash is modified fly ash; the raw materials of the modified fly ash include fly ash, 3-cyclohexylaminophenol, and polyvinyl alcohol.

[0005] As a further technical feature, the preparation method of the modified fly ash includes the following steps: after the 3-cyclohexylaminophenol is uniformly dispersed in ethanol, the fly ash is first mixed, and then the polyvinyl alcohol is secondly mixed, and the modified fly ash is obtained after drying.

[0006] As a further technical feature, the first mixing time is 0.5h, and the second mixing time is 2h.

[0007] As a further technical feature, the mass ratio of fly ash, polyvinyl alcohol, and 3-cyclohexylaminophenol is 100:10:3-5.

[0008] As a further technical feature, the slag powder is a blast furnace slag powder.

[0009] As a further technical feature, the steel slag powder includes one or more of electric furnace steel slag powder, open hearth steel slag powder, and converter steel slag powder.

[0010] As a further technical feature, the gypsum includes one or more of phosphogypsum, desulfurized gypsum, and anhydrite.

[0011] As a further technical feature, the activator includes sodium hydroxide and sodium silicate in a mass ratio of 2:5~7.

[0012] As a further technical feature, the solid waste-based corrosion-resistant cementitious material further comprises 3 to 4 parts of sodium dodecyl sulfonate and 1-aminocyclopropanecarboxylic acid methyl ester hydrochloride. As a further technical feature, the sodium dodecyl sulfonate and 1-aminocyclopropanecarboxylic acid methyl ester hydrochloride.

[0013] The solid waste powder in solid waste-based corrosion-resistant cementitious materials has the problem of easy agglomeration. Adding one or both of sodium dodecylsulfonate and 1-aminocyclopropanecarboxylic acid methyl ester hydrochloride can improve the dispersibility of the solid waste powder in the cementitious materials, improve the processing performance, and further improve the corrosion resistance of the cementitious materials.

[0014] The present invention also proposes a method for preparing a solid waste-based corrosion-resistant gelling material, comprising the following steps: mixing the components, ball milling, and sieving to obtain the solid waste-based corrosion-resistant gelling material.

[0015] As a further technical feature, the mixing time is 15 to 30 minutes.

[0016] The working principle and beneficial effects of the present invention are: The present invention prepares a solid waste-based corrosion-resistant cementitious material. The cementitious material mainly uses slag powder and steel slag powder, and is added with fly ash modified with 3-cyclohexylaminophenol and polyvinyl alcohol, thereby obtaining a cementitious material with good corrosion resistance. The present invention adds 3-cyclohexylaminophenol and polyvinyl alcohol to the raw materials of the modified fly ash. The 3-cyclohexylaminophenol contains amino groups and phenolic hydroxyl groups, and can form hydrogen bonds with the surfaces of the fly ash and polyvinyl alcohol to reduce agglomeration. At the same time, the 3-cyclohexylaminophenol and polyvinyl alcohol form a dense network structure through hydrogen bonding, thereby improving the corrosion resistance of the cementitious material. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0018] Polyvinyl alcohol, model: 205, manufacturer: Japan Kuraray; Fly ash, model: Class II F fly ash; Desulfurization gypsum, model: 033, manufacturer: Hebei Hengyue Mining Products Co., Ltd.

[0019] Example 1 A solid waste-based corrosion-resistant cementitious material comprises the following components by weight: 40 parts of iron-making blast furnace slag powder, 10 parts of converter steel slag powder, 10 parts of desulfurization gypsum, 3 parts of calcium carbonate powder, 3 parts of modified fly ash, and 1 part of activator; the activator is sodium hydroxide and sodium silicate with a mass ratio of 1:3; The preparation method of the modified fly ash comprises the following steps: 3-cyclohexylaminophenol is uniformly dispersed in ethanol, then fly ash is mixed for 0.5 hours, and then polyvinyl alcohol is added and mixed for 2 hours to obtain the modified fly ash; wherein the mass-volume ratio of the fly ash and ethanol is 1g:7mL; the mass ratio of the fly ash, the polyvinyl alcohol, and the 3-cyclohexylaminophenol is 100:10:3. A preparation method of a solid waste-based corrosion-resistant cementitious material comprises the following steps: The slag powder, the steel slag powder, the gypsum, the calcium carbonate powder, the modified fly ash, and the activator are mixed for 15 minutes, ball-milled, and sieved (800-mesh sieve) to obtain the solid waste-based corrosion-resistant cementitious material.

[0020] Example 2 A solid waste-based corrosion-resistant cementitious material comprises the following components by weight: 60 parts of iron-making blast furnace slag powder, 25 parts of converter steel slag powder, 20 parts of desulfurization gypsum, 8 parts of calcium carbonate powder, 8 parts of modified fly ash, and 5 parts of activator; the activator is sodium hydroxide and sodium silicate with a mass ratio of 1:3. The preparation method of the modified fly ash comprises the following steps: 3-cyclohexylaminophenol is uniformly dispersed in ethanol, then fly ash is mixed, and then polyvinyl alcohol is added and mixed for 2 hours to obtain the modified fly ash; wherein the mass-volume ratio of the fly ash and ethanol is 1g:7mL; the mass ratio of the fly ash, the polyvinyl alcohol, and the 3-cyclohexylaminophenol is 100:10:3. A preparation method of a solid waste-based corrosion-resistant cementitious material comprises the following steps: The slag powder, the steel slag powder, the gypsum, the calcium carbonate powder, the fly ash, and the activator are mixed for 30 minutes, ball-milled, and sieved (800-mesh sieve) to obtain the solid waste-based corrosion-resistant cementitious material.

[0021] Example 3 The difference between this example and Example 1 is that in the raw materials of the modified fly ash, the mass ratio of the fly ash, the 3-cyclohexylaminophenol, and the polyvinyl alcohol is 25:2.5:1.

[0022] Example 4 The difference between this example and Example 1 is that in the raw materials of the modified fly ash, the mass ratio of the fly ash, the 3-cyclohexylaminophenol, and the polyvinyl alcohol is 20:2:1.

[0023] Example 5 The only difference between this embodiment and embodiment 3 is that the solid waste-based corrosion-resistant gelling material further includes 4 parts of sodium dodecyl sulfate.

[0024] Example 6 The only difference between this embodiment and embodiment 3 is that the solid waste-based corrosion-resistant cementitious material further includes 4 parts of 1-aminocyclopropanecarboxylic acid methyl ester hydrochloride.

[0025] Example 7 The only difference between this embodiment and embodiment 3 is that the solid waste-based corrosion-resistant cementitious material further includes 4 parts of sodium dodecylsulfonate and 1-aminocyclopropanecarboxylic acid methyl ester hydrochloride in a mass ratio of 7:1.

[0026] Example 8 The only difference between this embodiment and embodiment 3 is that the solid waste-based corrosion-resistant cementitious material further includes 4 parts of sodium dodecylsulfonate and 1-aminocyclopropanecarboxylic acid methyl ester hydrochloride in a mass ratio of 7:2.

[0027] Example 9 The only difference between this embodiment and embodiment 3 is that the solid waste-based corrosion-resistant cementitious material further includes 4 parts of sodium dodecylsulfonate and 1-aminocyclopropanecarboxylic acid methyl ester hydrochloride in a mass ratio of 7:3.

[0028] Comparative Example 1 The only difference between this comparative example and Example 1 is that polyvinyl alcohol is replaced by an equal amount of 3-cyclohexylaminophenol.

[0029] Comparative Example 2 The only difference between this comparative example and Example 1 is that 3-cyclohexylaminophenol is replaced by an equal amount of polyvinyl alcohol.

[0030] Comparative Example 3 The only difference between this comparative example and Example 1 is that the modified fly ash is replaced by an equal amount of fly ash.

[0031] Experimental example The solid waste-based corrosion-resistant cementitious materials prepared in Examples 1 to 9 and Comparative Examples 1 to 3 were prepared into concrete according to the following components by weight: 40 parts of cementitious material, 85 parts of natural sand, 95 parts of gravel, 17 parts of water, and 3 parts of polycarboxylate water-reducing agent (model NC-100, Shandong Noway New Material Technology Co., Ltd.) and tested according to the following method: 1. The 7d compressive strength of concrete was tested in accordance with the test standard of JGJ / T 70-2009 "Standard for Test Methods of Basic Properties of Building Mortar". The test results are shown in Table 1 below.

[0032] 2. The compressive strength corrosion resistance coefficient of the concrete was tested according to the test standard of GB / T 50082-2024 <Standard Test Method for Long-Term Performance and Durability of Standard Concrete>, and the test results are shown in Tables 1-2.

[0033] Table 1 Performance determination results of solid waste-based corrosion-resistant cementitious materials in Examples 1-4 and Comparative Examples 1-3

[0034] As shown in Table 1, the 7d compressive strength and compressive strength corrosion resistance coefficient of the solid waste-based corrosion-resistant cementitious materials in Examples 1-4 are higher than those in Comparative Examples 1-3, which indicates that by adding fly ash, 3-cyclohexylaminophenol and polyvinyl alcohol as raw materials for modified fly ash into the solid waste-based corrosion-resistant cementitious materials, the compressive strength and compressive strength corrosion resistance coefficient of the concrete can be improved when the solid waste-based corrosion-resistant cementitious materials are applied to the concrete.

[0035] Table 2 Performance determination results of solid waste-based corrosion-resistant cementitious materials in Example 3, Examples 5-9

[0036] As shown in Table 2, the compressive strength corrosion resistance coefficient of the solid waste-based corrosion-resistant cementitious materials in Examples 7-8 is higher than that in Example 3, Examples 5-6, and the addition of sodium dodecyl sulfonate and 1-aminocyclopropane methylate hydrochloride in the solid waste-based corrosion-resistant cementitious materials can further improve the compressive strength corrosion resistance coefficient of the solid waste-based corrosion-resistant cementitious materials.

[0037] The above is only a preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A solid waste-based corrosion-resistant gelling material, characterized in that: The invention comprises the following components in parts by weight: 40-60 parts of slag powder, 10-25 parts of steel slag powder, 10-20 parts of gypsum, 3-8 parts of calcium carbonate powder, 3-8 parts of fly ash, and 1-5 parts of activator; the fly ash is modified fly ash; The raw materials of the modified fly ash include fly ash, 3-cyclohexylaminophenol and polyvinyl alcohol.

2. The solid waste-based corrosion-resistant gelling material according to claim 1, characterized in that: The preparation method of the modified fly ash comprises the following steps: adding 3-cyclohexylaminophenol to ethanol and dispersing the mixture uniformly, adding fly ash and mixing the mixture for the first time, adding polyvinyl alcohol and mixing the mixture for the second time, and drying the mixture to obtain the modified fly ash.

3. The solid waste-based corrosion-resistant gelling material according to claim 1, characterized in that: The mass ratio of the fly ash, polyvinyl alcohol and 3-cyclohexylaminophenol is 100:10:3-5.

4. The solid waste-based corrosion-resistant gelling material according to claim 1, characterized in that: The slag powder is ironmaking blast furnace slag powder.

5. The solid waste-based corrosion-resistant gelling material according to claim 1, characterized in that: The steel slag powder includes one or more of electric furnace steel slag powder, open-hearth furnace steel slag powder, and converter steel slag powder.

6. The solid waste-based corrosion-resistant gelling material according to claim 1, characterized in that: The gypsum includes one or more of phosphogypsum, desulfurized gypsum and anhydrite.

7. The solid waste-based corrosion-resistant gelling material according to claim 1, characterized in that: The activator comprises sodium hydroxide and sodium silicate in a mass ratio of 2:5-7.

8. The solid waste-based corrosion-resistant gelling material according to claim 1, characterized in that: The solid waste-based corrosion-resistant gelling material further comprises one or both of sodium dodecylsulfonate and 1-aminocyclopropanecarboxylic acid methyl ester hydrochloride.

9. A method for preparing a solid waste-based corrosion-resistant gelling material, for preparing a solid waste-based corrosion-resistant gelling material according to any one of claims 1 to 8, characterized in that: The following steps are involved: The components are mixed, ball-milled, and sieved to obtain a solid waste-based corrosion-resistant gelling material.

10. The method for preparing a solid waste-based corrosion-resistant gelling material according to claim 9, characterized in that: The mixing time is 15 to 30 minutes.

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