CN115974432A - Solid waste cementing material for cement soil - Google Patents
Solid waste cementing material for cement soil Download PDFInfo
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- CN115974432A CN115974432A CN202310050542.9A CN202310050542A CN115974432A CN 115974432 A CN115974432 A CN 115974432A CN 202310050542 A CN202310050542 A CN 202310050542A CN 115974432 A CN115974432 A CN 115974432A
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Abstract
The application relates to the technical field of building materials, and discloses a solid waste cementing material for cement soil, which comprises the following raw materials in percentage by mass: 10 to 40 percent of cement, 50 to 85 percent of solid waste micro powder and 1 to 30 percent of excitant; the specific surface area of the solid waste micro powder is more than or equal to 600m 2 /kg，D90<30um. The solid waste cementing material for the cement soil is excited by the exciting agent, the hydration reaction speed is greatly increased, more needle-shaped rod-shaped Aft can be generated, the needle-shaped rod-shaped Aft is mutually interwoven and filled between C-S-H and soil particles, so that the solidified soil is hardened faster, the whole structure is more compact, the strength is higher, and the solidification effect is highThe fruit is better. Meanwhile, because a large amount of solid wastes are used, the cement consumption is reduced, and the method is green, low-carbon and environment-friendly.
Description
Technical Field
The application relates to the technical field of building materials, and mainly relates to a solid waste cementing material for cement soil.
Background
When pure cement and mucky soil are adopted to prepare cement soil, the cement mixing amount is high, but the actual curing effect of the cement soil is poor, and although part of cement can be replaced by admixtures such as fly ash, the early strength of the prepared cement soil is low, and the construction period is not favorable.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present application aims to provide a solid waste cementing material for cement soil, which aims to solve the problems of low early strength and poor solidification effect when pure cement and mucky soil are prepared into cement soil.
The technical scheme of the application is as follows:
the solid waste cementing material for the cement soil comprises the following raw materials in percentage by mass:
10-40% of cement, 50-85% of solid waste micro powder and 1-30% of excitant;
the specific surface area of the solid waste micro powder is more than or equal to 600m 2 /kg，D90<30um。
The solid waste cementing material for the cement soil is excited by the exciting agent, the hydration reaction speed is greatly increased, more needle bar-shaped Aft can be generated, the needle bar-shaped Aft is mutually interwoven and filled between C-S-H and soil particles, so that the solidified soil is hardened faster, the whole structure is more compact, the strength is higher, and the solidification effect is better.
The solid waste cementing material for the cement soil is characterized in that the solid waste micro powder is one or a mixture of more than two of steel slag powder, a silicon-aluminum admixture and ceramic polishing micro powder.
The solid waste cementing material for the cement soil uses a large amount of solid waste, reduces the cement consumption, and is green, low-carbon and environment-friendly.
The solid waste cementing material for the cement soil is characterized in that the solid waste micro powder is a mixture of more than two of steel slag powder, a silicon-aluminum admixture and ceramic polishing micro powder.
The solid waste cementing material for the cement soil is characterized in that the solid waste micro powder comprises a first component and a second component, the first component is steel slag powder, and the second component is one or more than two of slag powder and a silicon-aluminum admixture.
The solid waste cementing material for the cement soil is characterized in that the mass ratio of the first component to the second component is 1:1-1:4.
The solid waste cementing material for the cement soil is characterized in that the solid waste micro powder comprises a first component and a second component, the first component is slag powder, and the second component is one or more than two of a silicon-aluminum admixture and ceramic polishing micro powder.
The solid waste cementing material for the cement soil is characterized in that the mass ratio of the first component to the second component is 4:1-1:2.
The solid waste cementing material for the cement soil is characterized in that the cement is portland cement or ordinary portland cement.
The solid waste cementing material for the cement soil is characterized in that the excitant is sulfate, chloride, R-OH or R 2 -CO 3 One or more than two of calcium formate and carbide slag powder.
The solid waste cementing material for the cement soil is characterized in that 45um screen residue of the carbide slag powder is not more than 40%.
Has the advantages that: the solid-waste cementing material for the cement soil is excited by the exciting agent, the hydration reaction speed is greatly increased, more needle-shaped rod-shaped Aft can be generated, the needle-shaped rod-shaped Aft is mutually interwoven and filled between C-S-H and soil particles, so that the solidified soil is hardened faster, the whole structure is more compact, the strength is higher, and the solidification effect is better. Meanwhile, because a large amount of solid wastes are used, the cement consumption is reduced, and the cement is green, low-carbon and environment-friendly.
Detailed Description
The present application provides a solid waste cementing material for cement soil, and the following further details are provided to make the purpose, technical scheme and effect of the present application clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The application provides a solid waste cementing material for cement soil, which comprises the following raw materials in percentage by mass:
10 to 40 percent of cement, 50 to 85 percent of solid waste micro powder and 1 to 30 percent of excitant.
Wherein the cement is portland cement or ordinary portland cement.
The solid waste micro powder can be one or a mixture of more than two of steel slag powder, silicon-aluminum admixture, ceramic polishing micro powder and the like, and the specific surface area of the solid waste micro powder is more than or equal to 600m 2 /kg，D90<30um. The solid waste micro powder adopted in the application belongs to ultra-fine powder, the surface lattice distortion of the solid waste micro powder particles is high, the surface free energy is high, and the hydration reaction activity is greatly improved. Wherein, the silicon-aluminum admixture can be one or more than two of fly ash, coal gangue powder and coal-fired furnace slag powder.
The activator can be sulfate, chloride, R-OH, R 2 -CO 3 One or more of calcium formate and carbide slag powder. Wherein R-OH is KOH or NaOH, R 2 -CO 3 Is referred to as K 2 CO 3 Or Na 2 CO 3 . Wherein, the carbide slag powder is the powder ground by waste slag which takes calcium hydroxide as main component after acetylene gas is generated by hydrolyzing carbide, and the 45um screen residue is not more than 40 percent. If the activator adopts the carbide slag powder, the activator is equivalent to a large amount of calcium hydroxide in the early stage of hydration reaction, so that the unfavorable components such as humic acid and the like in the mucky soil of the mucky soil can be quickly consumed in the early stage, and simultaneously, the solid waste micro powder can be quickly excited to carry out hydration reaction and be solidified to form a whole.
According to the solid waste cementing material for the cement soil, the activator is used for exciting the hydration reaction activity of the solid waste micro powder, so that more needle-rod-shaped Aft (ettringite) is generated, a good curing effect is achieved, and the hardening speed is high; the content of Aft in the hydration product is high, and the hydration product can be filled between C-S-H (calcium silicate hydrate) and soil particles, so that the solidified soil has a more compact structure and higher strength; meanwhile, because a large amount of solid wastes are used, the using amount of cement is reduced, and green, low-carbon and environment-friendly effects are realized.
The mucky soil refers to cohesive soil with natural water content larger than liquid limit and natural pore ratio between 1.0 and 1.5. The soil is mainly distributed along the coasts and the periphery of the great rivers, great lakes in the southeast coastal areas and inland of China. Due to the high compressibility and low strength of the mucky soil, the settlement of the foundation of the mucky soil is large and is mostly uneven, and the cracking of the building wall and the overturning of the building are easy to cause. Therefore, before a building is constructed on the mucky soil, the mucky soil needs to be treated. The prior general treatment method is to use a cementing material and mucky soil to prepare cement soil and solidify the mucky soil, but has the following problems: in the traditional method, when pure cement is adopted to prepare the cement soil, the mixing amount of the pure cement is high, so that the treatment cost is high, but the actual curing effect of the cement soil is poor, and particularly when the pure cement is used for curing the mucky soil, the treatment cost is higher (generally more than 10 percent of the mixing amount is needed), the curing effect is poorer, the structure is loose, and the cement soil is difficult to harden into a whole. Although the admixture such as fly ash can be used for replacing part of cement, the prepared cement soil has low early strength, poor hardening effect and is unfavorable for the construction period.
Compared with the prior art, under the same cementing material dosage, the solid waste cementing material for the cement soil is excited by the exciting agent, the hydration reaction speed is greatly increased, more needle-shaped rod-shaped Aft can be generated, the solid waste cementing material is mutually interwoven and filled between C-S-H and soil particles, the solidified soil is hardened faster, the whole structure is more compact, the strength is higher, the solidification effect is better, in addition, a large amount of calcium ions generated by hydration can consume humic acid and other adverse components in the soil, the strength is favorably improved, and the hardening and hardening effect is increased. Therefore, the solid waste cementing material for the cement soil is particularly suitable for curing of mucky soil, can reduce the using amount of cement, has a better curing effect, and realizes green, low-carbon and environment-friendly effects.
In the scheme of the preferred embodiment of the application, the solid waste micro powder is composite solid waste micro powder, and is preferably a mixture of two or more of steel slag powder, silicon-aluminum admixture, ceramic polishing micro powder and the like.
Further, the solid waste micro powder comprises a first component and a second component, wherein the first component is steel slag powder, the second component is one or more than two of slag powder, silicon-aluminum admixture and the like, and the mass ratio of the first component to the second component is 1:1-1:4. The main component of the steel slag powder is C 3 S and C 2 S，C 3 S and C 2 S is a main component of cement clinker, so the steel slag powder is selected to replace part of cement, and the production cost is reduced, but because the hydration reaction speed of the active components in the steel slag powder is low, other active components and an exciting agent are required to be added to make up for the deficiency, so a second component is required to be matched with the first component for use in the application.
Further, the solid waste micro powder comprises a first component and a second component, wherein the first component is slag powder, the second component is one or more than two of silicon-aluminum admixture, ceramic polishing micro powder and the like, and the mass ratio of the first component to the second component is 4:1-1:2. By adopting the matching combination, the complete components in the cementing material system are ensured, the hydration reaction is facilitated to generate C-S-H and Aft, and the hydration reaction speed and the excitation activity can be accelerated by the excitation of the exciting agent.
When the solid waste cementing material for the cement soil is used, all raw materials are mixed with water.
The present application is further illustrated by the following specific examples.
Example 1
The solid waste cementing material for the cement soil comprises the following components in percentage by mass:
40% of cement, 50% of solid waste micro powder and 10% of sodium sulfate;
wherein the cement is ordinary portland cement. The solid waste micro powder is prepared by mixing steel slag powder and slag powder according to the mass ratio of 1:1, and the specific surface area of the steel slag powder and the specific surface area of the slag powder are both more than or equal to 600m 2 Kg, D90 all<30um. The activator can excite the activity of the steel slag powder and the slag powder to generate a large amount of Aft. In actual use, the sodium sulfate can be replaced by desulfurized gypsum.
When the solid waste cementing material for the cement soil and the sludge soil of the fish pond are adopted to prepare the cement soil, the 7d strength can reach 0.68MPa when the mixing amount of the solid waste cementing material for the cement soil is 5 percent and the water-cement ratio is 0.7.
In contrast, when the pure cement and the same fishpond mucky soil are used to prepare the cement soil, the 7d strength is not more than 0.4MPa when the mixing amount of the cement is 5 percent and the water-cement ratio is 0.7.
For comparison, a specific surface area of 400m was used 2 The steel slag powder and the slag powder of S95 level replace the steel slag powder and the slag powder to prepare the cementing material, the cement soil is prepared with the sludge soil of the fishpond under the same proportion, and the 7d strength is 0.05MPa when the doping amount is 5 percent and the water-cement ratio is 0.7.
According to the embodiment, the solid waste cementing material for the cement soil adopts the composite solid waste micro powder consisting of the steel slag powder and the slag powder, so that on one hand, the cost is reduced, the mucky soil can be solidified only by 5 percent of the doping amount, and the doping amount is at least 10 percent when the pure cement and the mucky soil are used for preparing the cement soil, so that the using amount of the cementing material is half saved; on the other hand, the utilization of a large amount of calcium ions generated by hydration can consume unfavorable components such as humic acid in the mucky soil, which is beneficial to improving the strength and increasing the hardening and hardening effect.
Example 2
The solid waste cementing material for the cement soil comprises the following components in percentage by mass:
30% of cement, 65% of solid waste micro powder and 5% of sodium hydroxide;
wherein the cement is ordinary portland cement. The solid waste micro powder is prepared by mixing steel slag powder and fly ash according to the mass ratio of 1:2, and the specific surface area of the steel slag powder and the specific surface area of the fly ash are both more than or equal to 600m 2 Kg, D90 all<30um. The alkali is used as an exciting agent to excite the activity of the steel slag powder and the silicon-aluminum material. In addition, coal gangue powder and coal-fired furnace slag powder can be used to replace fly ash.
When the solid waste cementing material for the cement soil and the fishpond mucky soil are adopted to prepare the cement soil, the 7d strength can reach 0.5MPa when the doping amount is 5% and the water-cement ratio is 0.7.
Example 3
The solid waste cementing material for the cement soil comprises the following components in percentage by mass:
20% of cement, 60% of solid waste micro powder, 5% of calcium formate and 15% of sodium sulfate;
wherein the cement is ordinary portland cement. The solid waste micro powder is prepared by mixing steel slag powder and fly ash according to the mass ratio of 1:2, and the specific surface area of the steel slag powder and the specific surface area of the fly ash are both more than or equal to 600m 2 Kg, D90 all<30um. Calcium formate and sulfate ions can promote cement hydration reaction and simultaneously generate Aft through synergistic reaction. In addition, coal gangue powder and coal-fired furnace slag powder can be used for replacing fly ash, and desulfurized gypsum can be used for replacing sodium sulfate.
When the solid waste cementing material for the cement soil and the fishpond mucky soil are adopted to prepare the cement soil, the 7d strength can reach 0.45MPa when the doping amount is 5% and the water-cement ratio is 0.7.
Example 4
The solid waste cementing material for cement soil of the embodiment comprises the following components in percentage by mass:
10% of cement, 60% of solid waste micro powder, 20% of carbide slag powder and 10% of sodium sulfate;
wherein the cement is ordinary portland cement. The solid waste micro powder is prepared by mixing steel slag powder and slag powder according to the mass ratio of 1:1, and the specific surface area of the steel slag powder and the specific surface area of the slag powder are both more than or equal to 600m 2 Kg, D90 all<30um. The carbide slag powder in the excitant can replace part of cement to provide calcium hydroxide required by the reaction, so that the early reaction is rapid. The sodium sulfate accelerates the hydration reaction of the cement and produces Aft through the synergistic reaction.
When the solid waste cementing material for the cement soil and the sludge soil of the fish pond are adopted to prepare the cement soil, the 7d strength can reach 0.55MPa when the doping amount is 5 percent and the water-cement ratio is 0.7.
Example 5
The solid waste cementing material for the cement soil comprises the following components in percentage by mass:
30% of cement, 50% of solid waste micro powder, 10% of carbide slag powder and 10% of sodium sulfate;
wherein the cement is ordinary portland cement. The solid waste micro powder is prepared from slag powder and fly ashMixing according to the mass ratio of 1.5 2 Kg, D90 all<30um. The carbide slag powder can improve alkalinity, accelerate cement hydration reaction, promote solid waste micro powder to dissolve, and the sodium sulfate also accelerates the cement hydration reaction to produce Aft through synergistic reaction. In addition, coal gangue powder and coal-fired furnace slag powder can be used to replace fly ash.
When the solid waste cementing material for the cement soil and the sludge soil of the fish pond are adopted to prepare the cement soil, the 7d strength can reach 0.62MPa when the doping amount is 5 percent and the water-cement ratio is 0.7.
Example 6
The solid waste cementing material for the cement soil comprises the following components in percentage by mass:
20% of cement, 50% of solid waste micro powder, 25% of carbide slag powder and 5% of sodium hydroxide;
wherein the cement is ordinary portland cement. The solid waste micro powder is prepared by mixing slag powder and ceramic polishing micro powder according to the mass ratio of 2:1, and the specific surface areas of the slag powder and the ceramic polishing micro powder are both more than or equal to 600m 2 Kg, D90 all<30um. The carbide slag powder can replace part of cement and provide calcium hydroxide required by reaction, so that the early reaction is rapid, and the sodium hydroxide excites the ceramic polishing micro powder.
When the solid waste cementing material for the cement soil and the sludge soil of the fish pond are adopted to prepare the cement soil, the 7d strength can reach 0.58MPa when the doping amount is 5 percent and the water-cement ratio is 0.7.
It should be understood that the application is not limited to the above examples, and that modifications or changes can be made by those skilled in the art based on the above description, and all such modifications and changes are intended to fall within the scope of the present application.
Claims (10)
1. The solid waste cementing material for the cement soil is characterized by comprising the following raw materials in percentage by mass:
10 to 40 percent of cement, 50 to 85 percent of solid waste micro powder and 1 to 30 percent of excitant;
the specific surface area of the solid waste micro powder is more than or equal to 600m 2 /kg，D90<30um。
2. The solid waste cementing material for cement soil according to claim 1, wherein the solid waste micro powder is one or a mixture of more than two of steel slag powder, silicon-aluminum admixture and ceramic polishing micro powder.
3. The solid waste cementing material for cement soil according to claim 1, wherein the solid waste micro powder is a mixture of more than two of steel slag powder, silicon-aluminum admixture and ceramic polishing micro powder.
4. The solid waste cementing material for cement soil according to claim 1, wherein the solid waste micro powder comprises a first component and a second component, the first component is steel slag powder, and the second component is one or more than two of slag powder and silicon-aluminum admixture.
5. The solid waste cementing material for cement soil according to claim 4, characterized in that the mass ratio of the first component to the second component is 1:1-1:4.
6. The solid waste cementing material for cement soil according to claim 1, wherein the solid waste micro powder comprises a first component and a second component, the first component is slag powder, and the second component is one or more than two of silicon-aluminum admixture and ceramic polishing micro powder.
7. The solid waste cementing material for cement soil according to claim 6, wherein the mass ratio of the first component to the second component is 4:1-1:2.
8. The solid waste cement material for cement soil according to claim 1, wherein the cement is portland cement or ordinary portland cement.
9. The solid waste cementing material for cement soil according to claim 1, wherein the excitant is sulfate, chloride, R-OH, R 2 -CO 3 One or more of calcium formate and carbide slag powder.
10. The solid waste cementing material for cement soil according to claim 9, characterized in that the 45um sieve residue of the carbide slag powder is not more than 40%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117447108A (en) * | 2023-10-25 | 2024-01-26 | 大连理工大学 | Composite cementing material and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101343161A (en) * | 2008-08-15 | 2009-01-14 | 同济大学 | Cement-slag powder gel system with desulfurized gypsum as excitant |
| CN101549977A (en) * | 2009-05-14 | 2009-10-07 | 吕运征 | Composite gelate material and method of producing the same |
| WO2020191444A1 (en) * | 2019-03-26 | 2020-10-01 | Makenit Pty Ltd | Improved geopolymer cement |
| CN115073116A (en) * | 2022-06-20 | 2022-09-20 | 涉县清漳水泥制造有限公司 | Grouting material containing steel slag solid waste base cementing material |
| CN115321848A (en) * | 2022-08-05 | 2022-11-11 | 段崇国 | Full-solid waste-based low-carbon green ecological cementing material and manufacturing method thereof |
-
2023
- 2023-02-01 CN CN202310050542.9A patent/CN115974432A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101343161A (en) * | 2008-08-15 | 2009-01-14 | 同济大学 | Cement-slag powder gel system with desulfurized gypsum as excitant |
| CN101549977A (en) * | 2009-05-14 | 2009-10-07 | 吕运征 | Composite gelate material and method of producing the same |
| WO2020191444A1 (en) * | 2019-03-26 | 2020-10-01 | Makenit Pty Ltd | Improved geopolymer cement |
| CN115073116A (en) * | 2022-06-20 | 2022-09-20 | 涉县清漳水泥制造有限公司 | Grouting material containing steel slag solid waste base cementing material |
| CN115321848A (en) * | 2022-08-05 | 2022-11-11 | 段崇国 | Full-solid waste-based low-carbon green ecological cementing material and manufacturing method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 李立涛;高谦;肖柏林;温震江;吴凡;: "工业固废开发充填胶凝材料概述与应用展望", 矿业研究与开发, no. 02 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117447108A (en) * | 2023-10-25 | 2024-01-26 | 大连理工大学 | Composite cementing material and preparation method thereof |
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