CN115872651A - Modification method of steel slag powder for concrete and application of steel slag powder - Google Patents
Modification method of steel slag powder for concrete and application of steel slag powder Download PDFInfo
- Publication number
- CN115872651A CN115872651A CN202310036541.9A CN202310036541A CN115872651A CN 115872651 A CN115872651 A CN 115872651A CN 202310036541 A CN202310036541 A CN 202310036541A CN 115872651 A CN115872651 A CN 115872651A
- Authority
- CN
- China
- Prior art keywords
- steel slag
- slag powder
- concrete
- carbon dioxide
- powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 163
- 239000010959 steel Substances 0.000 title claims abstract description 163
- 239000002893 slag Substances 0.000 title claims abstract description 162
- 239000000843 powder Substances 0.000 title claims abstract description 133
- 239000004567 concrete Substances 0.000 title claims abstract description 41
- 238000002715 modification method Methods 0.000 title claims abstract description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims abstract description 34
- 235000019796 monopotassium phosphate Nutrition 0.000 claims abstract description 34
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 23
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 23
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 20
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 claims abstract description 13
- LWIHDJKSTIGBAC-UHFFFAOYSA-K potassium phosphate Substances [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 20
- 238000005507 spraying Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 18
- 238000000227 grinding Methods 0.000 abstract description 9
- 238000007385 chemical modification Methods 0.000 abstract description 7
- 230000033558 biomineral tissue development Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 238000009776 industrial production Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 13
- 239000000292 calcium oxide Substances 0.000 description 12
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 12
- 239000000395 magnesium oxide Substances 0.000 description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000006703 hydration reaction Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 238000003763 carbonization Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000011575 calcium Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- CKMXBZGNNVIXHC-UHFFFAOYSA-L ammonium magnesium phosphate hexahydrate Chemical compound [NH4+].O.O.O.O.O.O.[Mg+2].[O-]P([O-])([O-])=O CKMXBZGNNVIXHC-UHFFFAOYSA-L 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910052567 struvite Inorganic materials 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003701 mechanical milling Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 150000005837 radical ions Chemical class 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention belongs to the field of building materials, and particularly relates to a modification method of steel slag powder for concrete and application of the steel slag powder. The technical points are as follows: a modification method of steel slag powder for concrete adopts potassium dihydrogen phosphate and carbon dioxide to modify the steel slag powder; specifically, the steel slag powder is modified by using a potassium dihydrogen phosphate solution and then is carbonized in a carbon dioxide atmosphere. The invention adopts a chemical modification method, utilizes the mineralization and the synergism of the monopotassium phosphate and the carbon dioxide to pretreat the steel slag powder, can save energy consumption and reduce grinding cost compared with the prior art, has simple process, can obtain materials with higher activity and stability, and is convenient for being widely applied to industrial production.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a modification method of steel slag powder for concrete and application of the steel slag powder.
Background
The fine steel slag powder as mineral admixture can replace partial cement, optimize the microstructure of concrete and improve the durability of concrete under the condition of proper mixing amount. Then the steel slag powder contains more f-CaO and f-MgO, and the free calcium oxide or magnesium oxide brings potential safety qualitative risks to the steel slag.
Meanwhile, because the activity of the steel slag is low, the mechanical grinding mode is mostly adopted in the prior art to improve the activity of the steel slag, so that the steel slag can be suitable for concrete hydration. But the energy consumption of mechanical milling is high and the increase of activity is limited. This results in the technical solution of using steel slag powder as mineral admixture to replace part of cement being greatly limited in practical production.
In view of the defects of the existing concrete steel slag powder, the inventor develops a modification method of the steel slag powder for concrete and application of the steel slag powder based on years of abundant experience and professional knowledge of the materials and by matching theoretical analysis and research innovation.
Disclosure of Invention
The invention aims to provide a method for modifying steel slag powder for concrete, which adopts potassium dihydrogen phosphate and carbon dioxide for mineralization and cooperative treatment of the steel slag powder to reduce the negative influence of the steel slag powder on the early hydration reaction of cement, and the steel slag has far lower chemical reaction activity than the cement, so that the early strength of cement concrete is lowAnd contains P 2 O 5 The substances can inhibit the hydration reaction of the cement in the early stage, and generally cause the retardation phenomenon of cement concrete; secondly, the steel slag contains free CaO and free MgO, which causes the problem of volume stability, and in severe cases, the hardened concrete is expanded and cracked. Simultaneously, the covalent bonds in the solid waste of the steel slag powder are destroyed, and the steel slag mainly contains CaO and SiO as chemical components 2 ，Fe 2 O 3 MgO, in addition to a small amount of A1 2 O 3 ，MnO 2 ，P 2 O 5 And the like, and these elements are all bonded in a covalent bond form, so that phases in the steel slag powder are mutually dissociated, the steel slag has low reactivity, and the oxides are mainly difficult to dissociate in a solution. The gelling property of the steel slag is derived from CH and C 2 S、C 3 S and other minerals, ca is mainly produced by dissociation 2+ 、OH - And silicon (aluminum) acid radical ions and the like, so that more in-situ holes appear on the surface of steel slag particles, the specific surface area of the steel slag powder is greatly increased, and the purpose of improving the stability of the steel slag powder is achieved.
The invention adopts the monopotassium phosphate to react with the free CaO and the free MgO which react slowly in the early stage in the steel slag to generate the MgKPO 4 ·6H 2 O (potassium struvite), caHPO 4 On one hand, the steel slag is promoted to be decomposed to form a new reaction interface; on the other hand, free CaO and free MgO are consumed, and the stability risk is reduced.
However, since monopotassium phosphate has a negative influence on cement reaction, monopotassium phosphate cannot be used in excess, and thus, the digestion of free CaO and free MgO is not thorough, and further measures need to be taken, and the second step of CO 2 Carbonization treatment to further decompose free CaO and free MgO and to produce CaCO 3 The crystals can provide nuclei for cement hydration. The two-step treatment can improve the reaction efficiency and the modification effect.
The technical purpose of the invention is realized by the following technical scheme:
according to the modification method of the steel slag powder for concrete, the steel slag powder is modified by adopting the cooperation of monopotassium phosphate and carbon dioxide; specifically, the steel slag powder is modified by using a potassium dihydrogen phosphate solution and then is carbonized in a carbon dioxide atmosphere.
The potassium dihydrogen phosphate can react with MgO in the steel slag powder to generate struvite and derivatives thereof, thereby reducing expansion phase in the steel slag powder, fixing free magnesium oxide, improving the stability of the steel slag powder, simultaneously disintegrating the structure of steel slag particles, forming more reaction interfaces, improving the activity of the steel slag powder under the condition of not adopting mechanical grinding, providing conditions for the reaction of the steel slag powder in cement concrete, but the steel slag powder modified by the potassium dihydrogen phosphate still contains a large amount of Ca (OH) 2 、f-CaO、C 2 S and other substances improve the activity of the steel slag powder along with the modification of the monopotassium phosphate, and the negative influence of the substances on the early hydration reaction of the cement is enlarged, so that the steel slag powder modified by the monopotassium phosphate is not suitable for concrete.
Therefore, in the invention, the steel slag powder is further modified by carbon dioxide, and Ca (OH) in the steel slag powder is modified by the carbon dioxide 2 、f-CaO、C 2 S and C 3 The S mineral is consumed by reaction, and the product is CaCO 3 On one hand, f-CaO is consumed by mineralization, so that stability hidden danger is eliminated, on the other hand, the microstructure of the steel slag powder is densified, a crystal nucleus growth point is provided for hydration of cement, and the combination effect of steel slag particles and C-S-H is strengthened, so that the strength can be improved.
Further, the specific operation steps of the modification method are as follows:
s1, placing steel slag powder into a container, stirring while placing the steel slag powder into the container, spraying a potassium dihydrogen phosphate solution onto the surface of the steel slag powder in a spraying mode while stirring, wherein after all spraying is finished, the stirring time is preferably 10min, and the standing time is preferably 6-10 h;
s2, standing, stirring the steel slag powder again, and introducing CO into the steel slag foundation 2 The gas and stirring time is preferably 6h, wherein the temperature of the steel slag powder is 20 ℃ or above.
The potassium dihydrogen phosphate can be used for treating steel slagThe surface of the particles forms an etching effect, but the phosphate causes the cement setting time to be abnormal. The phosphate ionizes charged ions in aqueous solution to generate replacement and coagulation, and insoluble film is generated in the setting and hardening process of cement to influence Ca (OH) 2 And C-S-H precipitation nucleation and C-A-S-H formation process, thereby delaying the setting and hardening of the cement and generating se:Sub>A delayed coagulation effect. The defects can be eliminated by superposition carbonization modification, so that the negative influence of the steel slag powder on the early hydration reaction of the cement is reduced; in addition, by a chemical modification method, covalent bonds in the solid waste of the steel slag powder can be destroyed, so that phases in the steel slag powder are dissociated with each other, more in-situ holes appear on the surfaces of steel slag particles, the specific surface area of the steel slag powder is obviously increased, the early activity of the steel slag powder is improved, and the stability of the steel slag powder is relieved.
Furthermore, the specific surface area of the steel slag powder is more than or equal to 300m 2 /kg。
Furthermore, the consumption of the monopotassium phosphate is 0.1-0.5 percent of the total amount of the steel slag powder.
On one hand, the content of free CaO and free MgO in the steel slag is considered, and the adverse effect of excessive potassium dihydrogen phosphate on the subsequent use of the steel slag in cement concrete is avoided.
Furthermore, the dosage of the potassium dihydrogen phosphate solution is 2 percent or less of the total mass of the steel slag powder.
Furthermore, the concentration of the carbon dioxide is more than or equal to 20 percent, and the balance is nitrogen or inert gas.
The higher the carbon dioxide concentration is, the higher the carbonization speed of the steel slag is, so that the invention selects the carbon dioxide concentration to avoid the variation of the properties of the steel slag caused by the overhigh carbon dioxide content and overhigh carbonization speed.
Further, the temperature of the carbon dioxide gas is 40-60 ℃.
The invention also aims to provide a preparation method of the white concrete surface protection material, which has the same technical effect.
The technical effects of the invention are realized by the following technical scheme:
the invention provides an application of steel slag powder for concrete obtained by adopting the modification method provided by the invention, and the steel slag powder is used for replacing cement in concrete.
Further, the mass ratio of the steel slag powder to the cement is 3.
In conclusion, the invention has the following beneficial effects:
the invention adopts a chemical modification method, utilizes the mineralization of monopotassium phosphate and carbon dioxide to carry out pretreatment on the steel slag powder, can save energy consumption and reduce grinding cost compared with the prior art, has simple process, can obtain materials with higher activity and stability, and is convenient to be widely applied to industrial production.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the specific embodiments, features and effects of the method for modifying steel slag powder for concrete and the use of the steel slag powder according to the present invention are described in detail below.
Example 1: modification method of steel slag powder for concrete and application of steel slag powder
The method for modifying the steel slag powder for concrete provided by the embodiment comprises the following operation steps:
s1, grinding the steel slag powder to be not less than 300m 2 Per kg, so as to further chemically modify the steel slag powder;
s2, spraying a potassium dihydrogen phosphate solution in a spraying mode while stirring the steel slag powder, wherein the doping amount of the potassium dihydrogen phosphate is 0.5 percent of the mass of the steel slag; the mass of the sprayed solution is 2 percent of that of the steel slag powder, and the stirring time is 10min;
s3, standing the spray-modified steel slag for 6 hours in an environment at the temperature of 20 ℃ to disintegrate the structure of steel slag particles to form more reaction interfaces, continuously stirring the steel slag powder, and then adopting 20% CO 2 And the balance of nitrogen and gas with the temperature of 60 ℃ are slowly introduced into the bottom of the steel slag powder, and the mixture is continuously stirred for 6 hours to obtain the modified steel slag powder. The contact area between the carbon dioxide gas and the steel slag powder is increased when the gas is introduced from the bottom and escapes upwards, so that the mineralization is more thorough.
Example 2: modification method of steel slag powder for concrete and application of steel slag powder
The method for modifying the steel slag powder for concrete provided by the embodiment comprises the following operation steps:
s1, grinding steel slag powder to 350m 2 Per kg, so as to further carry out chemical modification on the steel slag powder;
s2, spraying a potassium dihydrogen phosphate solution in a spraying mode while stirring the steel slag powder, wherein the doping amount of the potassium dihydrogen phosphate is 0.5 percent of the mass of the steel slag; the mass of the sprayed solution is 2 percent of that of the steel slag powder, and the stirring time is 12min;
s3, standing the spray modified steel slag for 10 hours in an environment at the temperature of 20 ℃, continuously stirring the steel slag powder, and then adopting 25% CO 2 And the balance of nitrogen and gas with the temperature of 60 ℃ are slowly introduced into the bottom of the steel slag powder, and the mixture is continuously stirred for 6 hours, so that the modified steel slag powder is obtained.
In the embodiment, because the specific surface area of the steel slag powder is increased, in order to enable the chemical modification of the monopotassium phosphate to be more uniform and thorough, the standing time and the stirring time are adjusted; meanwhile, the specific surface area of the steel slag powder is increased, so that the adsorption rate of the steel slag powder on carbon dioxide is increased, and the concentration of the carbon dioxide is increased.
Example 3: modification method of steel slag powder for concrete and application of steel slag powder
The method for modifying the steel slag powder for concrete provided by the embodiment comprises the following operation steps:
s1, grinding the steel slag powder to 320m 2 Per kg, so as to further carry out chemical modification on the steel slag powder;
s2, spraying a potassium dihydrogen phosphate solution in a spraying mode while stirring the steel slag powder, wherein the doping amount of the potassium dihydrogen phosphate is 0.5 percent of the mass of the steel slag; the mass of the sprayed solution is 1 percent of that of the steel slag powder, and the stirring time is 12min;
s3, standing the spray modified steel slag for 12 hours in an environment at the temperature of 20 ℃, continuously stirring the steel slag powder, and then adopting 25% CO 2 The balance of nitrogen and gas with the temperature of 60 ℃ are slowly introducedAdding the mixture into the bottom of the steel slag powder, and continuously stirring for 6 hours to obtain the modified steel slag powder.
In the embodiment, as the specific surface area of the steel slag powder is increased, the standing time is adjusted in order to enable the chemical modification of the monopotassium phosphate to be more uniform and thorough; meanwhile, the specific surface area of the steel slag powder is increased, so that the adsorption rate of the steel slag powder on carbon dioxide is increased, and the concentration of the carbon dioxide is increased.
Comparative example 1
The method for modifying the steel slag powder for concrete provided by the embodiment comprises the following operation steps:
s1, grinding steel slag powder to 320m 2 Per kg, so as to further chemically modify the steel slag powder;
s2, spraying a potassium dihydrogen phosphate solution in a spraying mode while stirring the steel slag powder, wherein the doping amount of the potassium dihydrogen phosphate is 0.5 percent of the mass of the steel slag; the mass of the sprayed solution is 1 percent of the mass of the steel slag powder, and the modified steel slag powder is obtained after stirring for 12 min.
Comparative example 2
The method for modifying the steel slag powder for concrete provided by the embodiment comprises the following operation steps:
s1, grinding steel slag powder to 320m 2 Per kg, so as to further chemically modify the steel slag powder;
s2, adopting 25% CO 2 And the balance of nitrogen and gas with the temperature of 60 ℃ are slowly introduced into the bottom of the steel slag powder, and the mixture is continuously stirred for 6 hours, so that the modified steel slag powder is obtained.
And (3) performance testing:
the raw steel slag powder and the steel slag powder obtained by modifying the steel slag powder obtained in the examples 1 to 3 and the comparative examples 1 to 2 are mixed according to the following ratio of cement: steel slag powder =7:3, the compressive strength of the prepared mortar test piece of 28d mortar is improved by 20-30 percent compared with that of the original steel slag powder group. The 6-hour autoclave expansion rate of the comprehensively modified steel slag powder is reduced by 50-70%.
TABLE 1 Performance test results
The test method comprises the following steps: the strength test method refers to GB/T51003-2014 mineral admixture application technical specification, and the 6h autoclaving expansion rate refers to the standard steel slag powder used in cement and concrete GB/T20491-2017.
Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.
Claims (9)
1. A modification method of steel slag powder for concrete is characterized in that monopotassium phosphate and carbon dioxide are used for modifying the steel slag powder cooperatively; specifically, the steel slag powder is modified by a potassium dihydrogen phosphate solution and then is carbonized in a carbon dioxide atmosphere.
2. The method for modifying the steel slag powder for concrete according to claim 1, which is characterized by comprising the following specific operation steps:
s1, placing steel slag powder into a container, spraying a potassium dihydrogen phosphate solution onto the surface of the steel slag powder in a spraying mode while stirring, and standing after all spraying is finished;
s2, standing, stirring the steel slag powder again and introducing CO into the steel slag foundation 2 A gas.
3. The method for modifying the steel slag powder for concrete according to claim 1, wherein the specific surface area of the steel slag powder is not less than 300m 2 /kg。
4. The method for modifying the steel slag powder for concrete according to claim 2, wherein the amount of the monopotassium phosphate is 0.1-0.5% of the total amount of the steel slag powder.
5. The method for modifying steel slag powder for concrete according to claim 2, wherein the amount of the potassium dihydrogen phosphate solution is 2% or less of the total mass of the steel slag powder.
6. The method for modifying the steel slag powder for concrete according to claim 2, wherein the concentration of the carbon dioxide is not less than 20%, and the balance is nitrogen or inert gas.
7. The method for modifying the steel slag powder for concrete according to claim 2, wherein the temperature of the carbon dioxide gas is 40 to 60 ℃.
8. Use of the steel slag powder for concrete obtained by the modification method according to any one of claims 1 to 7, wherein the steel slag powder is used to replace cement in concrete.
9. The use of the steel slag powder for concrete according to claim 8, wherein the mass ratio of the steel slag powder to the cement is 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310036541.9A CN115872651A (en) | 2023-01-10 | 2023-01-10 | Modification method of steel slag powder for concrete and application of steel slag powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310036541.9A CN115872651A (en) | 2023-01-10 | 2023-01-10 | Modification method of steel slag powder for concrete and application of steel slag powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115872651A true CN115872651A (en) | 2023-03-31 |
Family
ID=85758461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310036541.9A Pending CN115872651A (en) | 2023-01-10 | 2023-01-10 | Modification method of steel slag powder for concrete and application of steel slag powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115872651A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717837A (en) * | 2009-12-19 | 2010-06-02 | 中北大学 | Chemical activation liquid of converter slag and application method thereof |
| CN113072311A (en) * | 2021-05-10 | 2021-07-06 | 南京工业大学 | Steel slag auxiliary cementing material and preparation method and application thereof |
-
2023
- 2023-01-10 CN CN202310036541.9A patent/CN115872651A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717837A (en) * | 2009-12-19 | 2010-06-02 | 中北大学 | Chemical activation liquid of converter slag and application method thereof |
| CN113072311A (en) * | 2021-05-10 | 2021-07-06 | 南京工业大学 | Steel slag auxiliary cementing material and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| 何良玉等: "钢渣作胶凝材料和细集料制备中低强度钢管混凝土的研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》, vol. 2, no. 5, pages 015 - 412 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111302708B (en) | Comprehensive utilization technology of large-volume lithium slag waste and implementation method thereof | |
| CN112723843B (en) | Preparation method of weak-base-excited nickel slag high-strength concrete | |
| CN111747672B (en) | Superfine modified phosphorus slag powder and superfine composite admixture for concrete | |
| CN113336516A (en) | Cementing material prepared from multi-element solid wastes and cooperative regulation and control method thereof | |
| CN110040997B (en) | Nano-nucleating early strength agent for metakaolin as well as preparation method and application of nano-nucleating early strength agent | |
| CN113979653A (en) | Steel slag cementing material, preparation method and application | |
| CN110790553A (en) | Alkali-activated slag well cementation cement system capable of being regulated and controlled and method for regulating and controlling thickening time | |
| CN110627386A (en) | Titanium slag cement and preparation method and application thereof | |
| CN114751662B (en) | Preparation method of alkaline steel slag activity excitant and steel slag cementing material | |
| CN115159871A (en) | Method for exciting steel slag powder cementing material by chemical-physical coupling and application thereof | |
| CN111410508A (en) | Preparation method and application of building product based on power plant solid waste and carbon dioxide | |
| CN111302677A (en) | Super-sulfate cement and preparation method thereof | |
| CN114436613A (en) | Treatment-free saw mud based cementing material and preparation method and application thereof | |
| CN115872651A (en) | Modification method of steel slag powder for concrete and application of steel slag powder | |
| CN116283037A (en) | Commercial mixing station carbon fixation admixture, preparation method and application thereof | |
| CN114956642B (en) | Composite expanding agent based on regenerated micro powder and preparation method thereof | |
| CN114702255B (en) | Super-sulfate cement prepared from low-activity acidic slag and preparation method thereof | |
| CN115124308A (en) | Porous aggregate, plate and preparation method thereof | |
| CN115180881A (en) | Environment-friendly high-strength concrete and preparation method thereof | |
| CN114133158A (en) | Modified steel slag excitant and preparation method and application thereof | |
| CN114538812B (en) | Anhydrous II-type gypsum and preparation method thereof | |
| CN1272253C (en) | Process for preparing lithium nickelate and process for preparing enamel using it as adherence promotor | |
| CN117229012B (en) | Non-alkali excitation type steel slag cementing material and preparation method thereof | |
| KR20130107579A (en) | Furnace slag powder, method for manufacturing furnace slag powder and furnace slag cement composition using the same | |
| CN115368041B (en) | Phosphogypsum-based various solid waste baking-free ceramsite and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |