CN115259766A - Alkali-activated fly ash concrete and preparation method thereof - Google Patents
Alkali-activated fly ash concrete and preparation method thereof Download PDFInfo
- Publication number
- CN115259766A CN115259766A CN202210979867.0A CN202210979867A CN115259766A CN 115259766 A CN115259766 A CN 115259766A CN 202210979867 A CN202210979867 A CN 202210979867A CN 115259766 A CN115259766 A CN 115259766A
- Authority
- CN
- China
- Prior art keywords
- fly ash
- alkali
- concrete
- activated
- parts
- 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
- 239000010881 fly ash Substances 0.000 title claims abstract description 141
- 239000003513 alkali Substances 0.000 title claims abstract description 110
- 238000002360 preparation method Methods 0.000 title abstract description 22
- 239000002893 slag Substances 0.000 claims abstract description 35
- 238000003756 stirring Methods 0.000 claims abstract description 29
- 239000000843 powder Substances 0.000 claims abstract description 28
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003112 inhibitor Substances 0.000 claims abstract description 14
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims abstract description 14
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 14
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 14
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 13
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 13
- 229920001285 xanthan gum Polymers 0.000 claims abstract description 13
- 229940082509 xanthan gum Drugs 0.000 claims abstract description 13
- 235000010493 xanthan gum Nutrition 0.000 claims abstract description 13
- 239000000230 xanthan gum Substances 0.000 claims abstract description 13
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 11
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 11
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000008117 stearic acid Substances 0.000 claims abstract description 11
- 239000008030 superplasticizer Substances 0.000 claims abstract description 11
- 239000012190 activator Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 18
- 239000003638 chemical reducing agent Substances 0.000 claims description 16
- 239000002956 ash Substances 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 125000001624 naphthyl group Chemical group 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 19
- 239000000084 colloidal system Substances 0.000 abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 29
- 238000006703 hydration reaction Methods 0.000 description 25
- 230000036571 hydration Effects 0.000 description 23
- 239000004568 cement Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 12
- 230000001603 reducing effect Effects 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 239000011575 calcium Substances 0.000 description 6
- -1 calcium-aluminum-silicon Chemical compound 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 4
- 239000000920 calcium hydroxide Substances 0.000 description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 4
- 229910001424 calcium ion Inorganic materials 0.000 description 4
- 230000003334 potential effect Effects 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 3
- 229910002808 Si–O–Si Inorganic materials 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000010883 coal ash Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 235000015110 jellies Nutrition 0.000 description 3
- 239000008274 jelly Substances 0.000 description 3
- 229910001425 magnesium ion Inorganic materials 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 150000004645 aluminates Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000006253 efflorescence Methods 0.000 description 2
- 239000000499 gel Substances 0.000 description 2
- 230000000877 morphologic effect Effects 0.000 description 2
- 206010037844 rash Diseases 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 150000004760 silicates Chemical class 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910008051 Si-OH Inorganic materials 0.000 description 1
- 229910006358 Si—OH Inorganic materials 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical group [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- QSNHCQJQGQTAQN-UHFFFAOYSA-N calcium;silicon;hydrate Chemical compound O.[Si].[Ca] QSNHCQJQGQTAQN-UHFFFAOYSA-N 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007676 flexural strength test Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical group [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of concrete materials, and particularly discloses alkali-activated fly ash concrete and a preparation method thereof. The alkali-activated fly ash concrete comprises fine aggregate, coarse aggregate, an alkali activator, anhydrous sodium silicate, fly ash, slag powder, a retarder and an inhibitor; the preparation method comprises the following steps: the method comprises the following steps: (1) Adding the coarse aggregate and the fine aggregate into a stirrer, stirring for 2min, and uniformly stirring; (2) Sequentially adding alkali-activated fly ash, sodium hexametaphosphate, a naphthalene-based superplasticizer and xanthan gum into the stirrer, and continuously stirring for 5min at the temperature of 40 ℃ and under the condition that the pH is = 13; (3) And finally, adding stearic acid, and continuing stirring for 30s to prepare the alkali-activated fly ash concrete. The modified fly ash can be used for concrete and has the advantage of generating alkali-activated silica-aluminum-based colloid; in addition, the preparation method has the advantage of improving the compressive strength of the concrete.
Description
Technical Field
The application relates to the technical field of concrete materials, in particular to alkali-activated fly ash concrete and a preparation method thereof.
Background
The fly ash is fine particle powder directly collected and sorted from power plant pulverized coal flue gas, most of the particles are spherical glass bodies, the fly ash has the water reducing effect, the morphological effect, the filling effect and the volcanic ash activity, and the concrete surface has the following influence on the concrete performance: heat of hydration, workability, strength, impermeability, and drying shrinkage.
The fly ash can play a role in activating in concrete, so that gaps between cement and the fly ash can be smaller, a filling effect is achieved, and the structural compactness can be improved. Fly ash has a morphological effect because it is not strongly absorbent to water and fly ash has good flow properties. The fly ash is added into the concrete, so that the concrete has the characteristics of improving the performance of the concrete, increasing the fluidity, reducing the hydration heat, reducing the shrinkage, improving the later strength and durability, reducing the cost and the like.
In the traditional concrete, the activity of the fly ash can only be excited by cement and can not act as a blending material, the activity of the fly ash needs to be improved, and the chemical property needs to be developed. At present, alkali-activated cementitious materials seem to have the potential to replace ordinary portland cement, however, the new cementitious materials are still in the bud development stage at present, and further improvement of the performance of the alkali-activated generated colloid of fly ash is needed.
Disclosure of Invention
In order to improve the compressive strength of the alkali-activated concrete, the application provides the alkali-activated fly ash concrete and the preparation method thereof.
In a first aspect, the application provides an alkali-activated fly ash concrete, which adopts the following technical scheme:
the alkali-activated fly ash concrete comprises the following raw materials in parts by mass: 260-460 parts of fine aggregate, 336-988 parts of coarse aggregate, 10-20 parts of alkali activator, 25-35 parts of anhydrous sodium silicate, 120-258 parts of fly ash, 100-258 parts of slag powder, 12-16 parts of retarder and 25-38 parts of inhibitor.
By adopting the technical scheme, because the fly ash contains a large amount of structures such as silicon dioxide, alumina and the like with stable functions, when alkali is modified, the hard shell on the surface of fly ash particles is damaged to present a loose cracking appearance, so that the specific surface area is increased, the physical adsorption capacity is enhanced, the compressive strength of concrete is further improved, after the retarder is added, the hydration speed and the hydration heat of the concrete are reduced, the setting time of the concrete is prolonged, the structure of the concrete is more stable, the compressive strength of the concrete is further improved, the water reducing agent has an additive with a water reducing and enhancing effect, the water reducing agent can interact with colloid excited by alkali, the stability of the concrete is further improved, the heat resistance of the structure is enhanced, and the compressive strength of the concrete is improved. The synergist has the following efficient excitation functions: the water reducing agent and the dispersed cementing material are excited to the maximum extent, the mutual matching with the water reducing agent is realized, and the compressive strength of the concrete is improved. The inhibitor is added to prevent the deterioration of concrete properties due to excessive alkali in the concrete, thereby improving the compressive strength of the concrete.
Preferably, the alkali-activated fly ash concrete comprises the following raw materials in parts by mass: 258 parts of fine aggregate, 988 parts of coarse aggregate, 13 parts of alkali activator, 32 parts of anhydrous sodium silicate, 258 parts of fly ash, 258 parts of slag powder, 16 parts of retarder and 38 parts of inhibitor.
By adopting the technical scheme, the fly ash and the slag powder belong to calcium-aluminum-silicon glass materials, wherein the fly ash has very high content of crystallized substances and is generally spherical particles; slag powder is typically a crushed particle, fly ash is rich in alumina and slag powder is calcium oxide, so that mixing fly ash and slag powder with alkali excitation can form some hydration product and provide strength. Slag powder and fly ash are two widely used volcanic ash materials, can be used for exciting the potential activity of the volcanic ash materials by strong alkali to generate a cementing material or be used for replacing part of cement and aggregate to be added into concrete, the slag powder is granulated blast furnace slag which is discharged from an iron-making blast furnace and rapidly quenched in water under a molten state to form a large amount of vitreous materials, and the powdery admixture is obtained after drying and grinding; the fly ash is an industrial byproduct generated by a coal-fired power plant, contains a plurality of vitreous components, but belongs to an amorphous system, and the two vitreous components have different compositions and structures; generally, the vitreous nature of the slag powder is easier to remove the polymerization than the vitreous nature of the fly ash, i.e. the slag powder has good activity, because the crystal structure of the fly ash surface is one of the main factors influencing its activity. In terms of chemical components, the main components of the water-quenched slag powder are SiO2 and CaO; the main components of the fly ash are SiO2 and A12O3, and the compositions of the fly ash are mostly close to that of cement, and have the second characteristics of cementation and pozzolanic reaction. The crystal structure of the downloaded water quenched slag powder is stable, the chemical bonds of the slag powder cannot be completely scattered only by the polarity of water, stronger polar ions are required to be applied to effectively accelerate the hydration reaction of the slag powder, and the most common method at present is to excite the potential activity of the water quenched slag powder by using a strong alkali solution to cause the hydration reaction of the water quenched slag powder. The low activity of the fly ash can not directly use the fly ash as a hydraulic material, and alkali liquor is needed to be used as an exciting agent to excite the potential activity of the fly ash, so that the fly ash can react with water to form the silicon-aluminum-based cementing material.
Preferably, the alkali-activated fly ash comprises the following steps:
s1: mixing the fly ash and the slag according to the mass ratio of 7:3, stirring to obtain an ash mixture, and mixing sodium hydroxide and sodium silicate to prepare an alkali-activated solution;
s2: mixing the ash body mixture with the alkali-activated solution, heating to 100-120 ℃ for 5-6h to obtain alkali-activated fly ash;
s3: curing the alkali-activated fly ash at the temperature of 40-60 ℃ to obtain a solid substance.
By adopting the technical scheme, the main product of the alkali-activated fly ash (mainly comprising silicon and aluminum) is the silicon-aluminum-based colloid, and the reaction mechanism of the alkali-activated fly ash comprises two combined reaction mechanisms of destruction and condensation. When the surface of the fly ash particles is subjected to initial chemical erosion at a certain point, high-concentration hydroxide ions can destroy Si-O-Si and Si-O-A1 on the surface of the fly ash sphere and covalent bonds between the Si-O-A1 and the A1-O-A1 along with the increase of the pH value to form a colloidal state; then the silicon ions and the aluminum ions are released and combined with hydroxide ions to form Si-OH and A1-OH, and then gradually accumulated together to form a condensation structure; as the alkali-activated reaction continues to produce the silica-alumina-based colloid, the reaction can be carried out until the fly ash is completely or almost completely consumed; finally, these individual silicates and aluminates combine to form a compact structure of Si-O-A1 and Si-O-Si bonds, the resulting three-dimensional structure being in particular an alkali-activated silica-aluminum-based colloid. The alkali-activated process of fly ash is to mix fly ash with a certain amount of activator, then to cure the mixture at a certain temperature to form a solid substance, so that the components with glass in the fly ash are converted into a tightly structured cemented hydraulic material.
Preferably, the retarder is sodium hexametaphosphate.
By adopting the technical scheme, the sodium hexametaphosphate has strong hygroscopicity, can gradually absorb water when being exposed in the air to form a sticky substance, can generate a soluble complex compound with metal ions such as calcium, magnesium and the like to adjust the setting time of fresh concrete, can ensure that the concrete keeps plasticity for a long time according to requirements, phosphate reacts with calcium hydroxide to generate insoluble calcium phosphate to block the hydration, C-S-H colloid (calcium silicon hydrate colloid) alkali-slag cement is a main product, silicon and calcium are main components, and silicate in water glass reacts with calcium ions to form C-S-H colloid; then silicate and aluminate ions decomposed from the slag react with calcium ions, sodium ions, magnesium ions and the like to generate secondary C-S-H colloid, and the calcium and magnesium ions react with sodium hexametaphosphate to obtain a complex containing the calcium and magnesium ions, so that the compressive strength of the concrete is improved.
Preferably, the alkali-activated fly ash concrete further comprises a water reducing agent, wherein the water reducing agent is a naphthalene-based high-efficiency water reducing agent.
By adopting the technical scheme, the naphthalene based superplasticizer has higher water reducing rate and does not bleed air, and when the water-cement ratio is not changed, the initial slump of concrete is improved, and the water reducing rate is also improved. Has obvious reinforcing effect on concrete. The workability of the concrete is improved, the physical and mechanical properties of the concrete are comprehensively improved, the adaptability to various cements is good, the admixture is well compatible with other various concrete admixtures, and the naphthalene-based superplasticizer is matched with the retarder sodium hexametaphosphate, so that the compressive strength of the concrete is improved.
Preferably, the alkali-activated fly ash concrete further comprises a synergist which is xanthan gum.
By adopting the technical scheme, more than 20% of jelly in the concrete can not be fully hydrated and only plays a filling role, so that unhydrated substances are wasted, and the strength of the concrete can not be fully exerted. The xanthan gum has the characteristics of high-efficiency thickening, stable suspension, high pseudoplasticity and the like, has high stability, acid and alkali resistance and high salt environment, does not play a water reducing role on concrete any more when the mixing amount of a common water reducing agent and a jelly reaches a certain value due to the limitation of the action mechanism of the common water reducing agent and the jelly, has the mucilaginous property, can improve the performance of fresh concrete, improves the workability and reduces bleeding; the pumping friction is small, and the compressive strength of the concrete is improved.
Preferably, the inhibitor is stearic acid.
By adopting the technical scheme, after the concrete is subjected to alkali efflorescence, the concrete is easy to crack and loose and peel on the surface under the action of drying and water loss or carbonization in a natural environment, calcium hydroxide and other components can be combined into stable components or adsorbed by aggregates and do not migrate to the outer surface of the concrete any more by doping additives or active materials, so that the aim of preventing the alkali efflorescence is fulfilled.
In a second aspect, the application provides a preparation method of alkali-activated fly ash concrete, which adopts the following technical scheme: a preparation method of alkali-activated fly ash concrete comprises the following steps:
(1) Adding the coarse aggregate and the fine aggregate into a stirrer, stirring for 2min, and uniformly stirring;
(2) Sequentially adding alkali-activated fly ash, sodium hexametaphosphate, a naphthalene-based superplasticizer and xanthan gum into the stirrer, and continuously stirring for 5min at the temperature of 40 ℃ and under the condition that the pH is = 13;
(3) And finally, adding stearic acid, and continuing stirring for 30s to prepare the alkali-activated fly ash concrete.
By adopting the technical scheme, the workability of the fly ash concrete is an important factor influencing concrete construction, the good workability of the concrete is beneficial to improving the strength and the durability of the concrete, and the fly ash concrete provides a powerful support for the frost resistance, the impermeability and the resistance to the damage of the external environment. The performances of the fly ash, the additive, the aggregate gradation and the like have obvious influence on the workability of the concrete, and the final strength of the fly ash concrete is higher than that of the common concrete. The activity of the fly ash is excited in an alkaline environment, so that the hydration speed of the fly ash is slower than that of cement, and after the fly ash is hydrated, calcium hydroxide is generated to react to form calcium silicate gel. Thus, the interface structure between the coarse aggregates is improved, and the calcium hydroxide is consumed, so that the strength of the concrete is further improved. In addition, the hydration speed of the fly ash is relatively low, the hydration can be more sufficient under the condition of the same water-cement ratio, and the water generated after the fly ash is hydrated can promote the continuous hydration, so that the strength of the concrete is further improved.
In summary, the present application has the following beneficial effects:
1. as the coal ash and the slag powder are adopted in the concrete, the coal ash contains a large amount of structures such as silicon dioxide and aluminum oxide with stable functions, and the like, when the alkali is modified, the hard shell on the surface of the coal ash particles is damaged to present a loose cracking appearance, so that the specific surface area is increased, the physical adsorption capacity is enhanced, and further the compressive strength of the concrete is improved. The synergist has the following efficient excitation functions: the water reducing agent and the dispersed cementing material are excited to the maximum extent, the mutual matching with the water reducing agent is realized, and the compressive strength of the concrete is improved. The inhibitor is added to prevent the deterioration of concrete performance caused by excessive alkali in the concrete, so that the effect of improving the compressive strength of the concrete is obtained;
2. in the application, the alkali-activated fly ash and the slag powder are preferably adopted, the slag powder and the fly ash are two widely used volcanic ash materials, and can be used for activating the potential activity of the volcanic ash materials by using strong alkali to produce a cementing material or be used for replacing part of cement and aggregate to be added into concrete; finally, the independent silicates and the aluminates are combined together to form a compact structure with Si-O-A1 and Si-O-Si bonds, and the generated three-dimensional structure is particularly alkali-activated silica-aluminum-based colloid, so that the compressive strength of the concrete is improved;
3. according to the method, the activity of the fly ash is excited in an alkaline environment, so that the hydration speed of the fly ash is slower than that of cement, after hydration, the fly ash can generate Ca (OH) 2 after hydration, and calcium silicate gel is formed through reaction. Thus, the interface structure of the coarse aggregate is improved, and Ca (OH) 2 is consumed, so that the strength of the concrete is further improved. In addition, the hydration speed of the fly ash is relatively low, the hydration can be more sufficient under the condition of the same water-cement ratio, and the water generated after the hydration of the fly ash can promote the continuous hydration, so that the strength of the concrete is further improved.
Detailed Description
The present application is further described in detail with reference to the following examples, which are specifically illustrated by the following: the following examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer, and the starting materials used in the following examples are available from ordinary commercial sources unless otherwise specified.
The naphthalene water reducer is ZG-1 naphthalene high-efficiency water reducer, slag powder: s95 grade, density of 2.9g/cm < 3 >, fluidity ratio of 102 percent and 28d compressive strength ratio of 101 percent.
Examples of preparation of raw materials and/or intermediates
Preparation example 1
The preparation method of the alkali-activated fly ash comprises the following steps:
s1: mixing 120kg of fly ash and slag according to a mass ratio of 7:3, stirring to obtain an ash mixture, and mixing 10kg of sodium hydroxide and 25kg of sodium silicate to prepare an alkali-activated solution;
s2: mixing the ash body mixture with the alkali-activated solution, heating to 120 ℃ for 5-6h to obtain alkali-activated fly ash;
s3: curing the alkali-activated fly ash at 40 ℃ to obtain a solid substance.
Preparation example 2
The preparation method of the alkali-activated fly ash comprises the following steps:
s1: mixing 150kg of fly ash and slag according to a mass ratio of 7:3, stirring to obtain an ash mixture, and mixing 13kg of sodium hydroxide and 32kg of sodium silicate to prepare an alkali-activated solution;
s2: mixing the ash body mixture with the alkali-activated solution, heating to 120 ℃ for 5-6h to obtain alkali-activated fly ash;
s3: curing the alkali-activated fly ash at 40 ℃ to obtain a solid substance.
Preparation example 3
The preparation method of the alkali-activated fly ash comprises the following steps:
s1: mixing 180kg of fly ash and slag according to the mass ratio of 7:3, stirring to obtain an ash mixture, and mixing 18kg of sodium hydroxide and 32kg of sodium silicate to prepare an alkali-activated solution;
s2: mixing the ash body mixture with the alkali-activated solution, heating to 120 ℃ for 5-6h to obtain alkali-activated fly ash;
s3: curing the alkali-activated fly ash at 40 ℃ to obtain a solid substance.
Examples
Example 1
The alkali-activated fly ash concrete comprises the following raw materials in parts by weight: 260kg of fine aggregate, 336kg of coarse aggregate, 10kg of alkali activator, 25kg of anhydrous sodium silicate, 120kg of fly ash, 100kg of slag powder, 12kg of retarder and 25kg of inhibitor.
A preparation method of alkali-activated fly ash concrete comprises the following steps:
(1) Adding the coarse aggregate and the fine aggregate into a stirrer, stirring for 2min, and uniformly stirring;
(2) Sequentially adding the alkali-activated fly ash prepared in the preparation example 2, sodium hexametaphosphate, a naphthalene-based superplasticizer and xanthan gum into a stirrer, and continuously stirring for 5min at the temperature of 40 ℃ and under the condition that the pH is = 13;
(3) And finally, adding stearic acid, and continuing stirring for 30s to prepare the alkali-activated fly ash concrete.
Example 2
The alkali-activated fly ash concrete comprises the following raw materials in parts by weight: 360kg of fine aggregate, 580kg of coarse aggregate, 15kg of alkali activator, 30kg of anhydrous sodium silicate, 185kg of fly ash, 158kg of slag powder, 14kg of retarder and 29kg of inhibitor.
A preparation method of alkali-activated fly ash concrete comprises the following steps:
(1) Adding the coarse aggregate and the fine aggregate into a stirrer, stirring for 2min, and uniformly stirring;
(2) Sequentially adding the alkali-activated fly ash prepared in the preparation example 2, sodium hexametaphosphate, a naphthalene-based superplasticizer and xanthan gum into a stirrer, and continuously stirring for 5min at the temperature of 40 ℃ and under the condition that the pH is = 13;
(3) And finally, adding stearic acid, and continuing stirring for 30s to prepare the alkali-activated fly ash concrete.
Example 3
The alkali-activated fly ash concrete comprises the following raw materials in parts by weight: 460kg of fine aggregate, 988kg of coarse aggregate, 20kg of alkali activator, 25kg of anhydrous sodium silicate, 258kg of fly ash, 258kg of slag powder, 16kg of retarder and 38kg of inhibitor.
A preparation method of alkali-activated fly ash concrete comprises the following steps:
(1) Adding the coarse aggregate and the fine aggregate into a stirrer, stirring for 2min, and stirring uniformly;
(2) Sequentially adding the alkali-activated fly ash prepared in the preparation example 2, sodium hexametaphosphate, a naphthalene-based superplasticizer and xanthan gum into a stirrer, and continuously stirring for 5min at the temperature of 40 ℃ and under the condition that the pH is = 13;
(3) And finally, adding stearic acid, and continuing stirring for 30s to prepare the alkali-activated fly ash concrete.
Comparative example
Comparative example 1
An alkali-activated fly ash concrete was prepared as in example 2, except that fly ash and slag powder were used directly after crushing without alkali-activation.
Comparative example 2
An alkali-activated fly ash concrete was prepared as in example 2, except that the retarder sodium hexametaphosphate was not added.
Comparative example 3
An alkali-activated fly ash concrete was prepared as in example 2, except that the sodium hexametaphosphate retarder was replaced with ferrous sulfate.
Comparative example 4
An alkali-activated fly ash concrete was prepared as in example 2, except that no naphthalene based superplasticizer was added.
Comparative example 5
An alkali-activated fly ash concrete was prepared as in example 2, except that the naphthalene based superplasticizer was replaced with lignosulfonate.
Comparative example 6
An alkali-activated fly ash concrete was prepared as in example 2, except that no synergist xanthan gum was added.
Comparative example 7
An alkali-activated fly ash concrete was prepared as in example 2, except that the synergist xanthan gum was replaced with a desulfurization synergist.
Comparative example 8
An alkali-activated fly ash concrete was prepared as in example 2, except that the inhibitor stearic acid was not added.
Comparative example 9
An alkali-activated fly ash concrete was prepared as in example 2, except that the inhibitor stearic acid was replaced with an acrylate.
Performance test
The alkali-activated fly ash concrete prepared in examples 1-3 and comparative examples 1-9 was subjected to performance testing.
The 7d compressive strength, 28d compressive strength, 90d compressive strength, 120d compressive strength, 210d compressive strength and 28d flexural strength tests were performed, respectively, and the test results are shown in table 2. The compression strength test of the recycled concrete is carried out according to a test method of compression strength and breaking strength tests in the standard of ordinary concrete mechanical property test methods (GB/T50081-2002).
TABLE 1
As can be seen by combining examples 1-3 and comparative examples 1-11 and by combining Table 1, the compressive strength of 7d, the compressive strength of 28d, the compressive strength of 90d, the compressive strength of 120d and the compressive strength of 210d of examples 1-3 are all higher than those of comparative examples 1-11, which shows that the compressive strength of concrete can be enhanced by the modified fly ash, the fly ash generates cementitious materials or is used for replacing part of cement and aggregate to be added into concrete, the reaction mechanism comprises two combined reaction mechanisms of destruction and coagulation, and the generation of silicon-aluminum-based cement is continuously carried out along with alkali-activated reaction, so that the compressive strength of concrete is improved.
Compared with the example 2, the compression strength of the concrete in the comparative example 1 is much lower, which illustrates the method for preparing the concrete by using the modified fly ash, the activity of the fly ash is excited in an alkaline environment, the hydration speed of the fly ash is slower, the hydration can be more sufficient under the condition of the same water-cement ratio, and the water generated after the hydration of the fly ash can promote the continuous hydration, so that the strength of the concrete is further improved.
Comparative examples 2-3 compared with example 2, the compressive strength of the concrete in comparative examples 2-3 was lower, which shows that the retarder sodium hexametaphosphate keeps the plasticity of the concrete for a longer time, and improves the compressive strength of the concrete.
Compared with the example 2, the concrete in the comparative examples 4-5 has lower compressive strength, which shows that the naphthalene-based superplasticizer has better water reducing effect, so that the initial slump of the concrete is improved, the water reducing rate is also improved, and the concrete has obvious reinforcing effect.
Compared with the concrete in example 2, the concrete in comparative examples 7-8 has lower compressive strength, which shows that the xanthan gum has the characteristics of high-efficiency thickening, stable suspension, high pseudoplasticity and the like, and the xanthan gum has high stability, so that the compressive strength of the concrete can be higher.
Compared with the concrete in the example 2, the concrete in the comparative examples 9-10 has lower compressive strength, which shows that stearic acid can reduce the alkaline substances of the concrete and react with sodium hydroxide to generate sodium stearate, thereby reducing the risk of concrete alkalization and improving the compressive strength of the concrete.
TABLE 2
| Item | 28d flexural strength/Mpa |
| Example 1 | 5.3 |
| Example 2 | 6.2 |
| Example 3 | 5.5 |
| Comparative example 1 | 4.1 |
| Comparative example 2 | 4.6 |
| Comparative example 3 | 4.2 |
| Comparative example 4 | 4.5 |
| Comparative example 5 | 3.6 |
| Comparative example 6 | 4.4 |
| Comparative example 7 | 3.8 |
| Comparative example 8 | 3.9 |
| Comparative example 9 | 4.9 |
| Comparative example 10 | 4.7 |
As can be seen by combining examples 1-3 and table 2, the flexural strength in example 2 is the highest, which indicates that the flexural strength of the concrete is improved by the modified fly ash, the hydration speed of the modified fly ash is relatively slow, hydration can be more sufficient under the condition of the same water-cement ratio, and the water generated after the fly ash is hydrated promotes to be hydrated again, so as to further improve the strength of the concrete.
Claims (8)
1. An alkali-activated fly ash concrete is characterized in that: the concrete comprises the following raw materials in parts by mass: 260-460 parts of fine aggregate, 336-988 parts of coarse aggregate, 10-20 parts of alkali activator, 25-35 parts of anhydrous sodium silicate, 120-258 parts of fly ash, 100-258 parts of slag powder, 12-16 parts of retarder and 25-38 parts of inhibitor.
2. The alkali-activated fly ash concrete of claim 1, wherein: the alkali-activated fly ash concrete comprises the following raw materials in parts by mass: 258 parts of fine aggregate, 988 parts of coarse aggregate, 13 parts of alkali activator, 32 parts of anhydrous sodium silicate, 258 parts of fly ash, 258 parts of slag powder, 16 parts of retarder and 38 parts of inhibitor.
3. The alkali-activated fly ash concrete of claim 1, wherein: the alkali-activated fly ash comprises the following steps:
s1: mixing the fly ash and the slag according to a mass ratio of 7:3, stirring to obtain an ash mixture, and mixing sodium hydroxide and sodium silicate to prepare an alkali-activated solution;
s2: mixing the ash body mixture with the alkali-activated solution, heating to 100-120 ℃ for 5-6h to obtain alkali-activated fly ash;
s3: curing the alkali-activated fly ash at the temperature of 40-60 ℃ to obtain a solid substance.
4. The alkali-activated fly ash concrete of claim 1, wherein: the retarder is sodium hexametaphosphate.
5. The alkali-activated fly ash concrete of claim 1, wherein: the alkali-activated fly ash concrete also comprises a water reducing agent, wherein the water reducing agent is a naphthalene-based high-efficiency water reducing agent.
6. The alkali-activated fly ash concrete of claim 1, wherein: the alkali-activated fly ash concrete also comprises a synergist, wherein the synergist is xanthan gum.
7. The alkali-activated fly ash concrete of claim 1, wherein: the inhibitor is stearic acid.
8. The method for preparing alkali-activated fly ash concrete according to claim 1, wherein the method comprises the following steps: the method comprises the following steps:
(1) Adding the coarse aggregate and the fine aggregate into a stirrer, stirring for 2min, and stirring uniformly;
(2) Sequentially adding alkali-activated fly ash, sodium hexametaphosphate, a naphthalene-based superplasticizer and xanthan gum into the stirrer, and continuously stirring for 5min at the temperature of 40 ℃ and under the condition that the pH is = 13;
(3) And finally, adding stearic acid, and continuing stirring for 30s to prepare the alkali-activated fly ash concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210979867.0A CN115259766A (en) | 2022-08-16 | 2022-08-16 | Alkali-activated fly ash concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210979867.0A CN115259766A (en) | 2022-08-16 | 2022-08-16 | Alkali-activated fly ash concrete and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115259766A true CN115259766A (en) | 2022-11-01 |
Family
ID=83750460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210979867.0A Pending CN115259766A (en) | 2022-08-16 | 2022-08-16 | Alkali-activated fly ash concrete and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115259766A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111847995A (en) * | 2020-05-28 | 2020-10-30 | 山东高速集团有限公司 | Red mud-based solid waste pervious concrete and preparation method and application thereof |
| CN112250355A (en) * | 2020-09-27 | 2021-01-22 | 山西省交通科技研发有限公司 | Alkali-activated fly ash/slag recycled concrete and preparation method thereof |
| CN112979191A (en) * | 2019-12-13 | 2021-06-18 | 湖北工业大学 | Alkali-activated cementing material and preparation method thereof |
-
2022
- 2022-08-16 CN CN202210979867.0A patent/CN115259766A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112979191A (en) * | 2019-12-13 | 2021-06-18 | 湖北工业大学 | Alkali-activated cementing material and preparation method thereof |
| CN111847995A (en) * | 2020-05-28 | 2020-10-30 | 山东高速集团有限公司 | Red mud-based solid waste pervious concrete and preparation method and application thereof |
| CN112250355A (en) * | 2020-09-27 | 2021-01-22 | 山西省交通科技研发有限公司 | Alkali-activated fly ash/slag recycled concrete and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 王前曦: "水泥基饰面砂浆抗泛碱性能定量评价及抑制措施研究" * |
| 王宗昌: "《建筑施工细部操作技术》", 北京：中国建材工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5484480A (en) | Use of alumina clay with cement fly ash mixtures | |
| CN110304847B (en) | Wet-grinding carbide slag excitant and preparation method and application thereof | |
| CN108793893A (en) | Heat resistance concrete and preparation method thereof | |
| KR102685380B1 (en) | Ultra-low carbon clinker-free cement and its manufacturing method and application | |
| CN111847921B (en) | Low clinker cement and preparation method and application thereof | |
| KR20060104990A (en) | Cement setting accelerator | |
| CN114751662B (en) | Preparation method of alkaline steel slag activity excitant and steel slag cementing material | |
| CN113667061B (en) | Water-absorbent resin and preparation method and application thereof | |
| CN110698088B (en) | Retarded portland cement and preparation method thereof | |
| CN112592088A (en) | Concrete micro-expansion reinforcing agent and preparation method thereof, concrete and application thereof | |
| CN116715491A (en) | Steel slag-based carbon-fixing material and preparation method and application thereof | |
| CN114956642B (en) | Composite expanding agent based on regenerated micro powder and preparation method thereof | |
| CN115159923B (en) | Low-shrinkage anti-freezing large-volume concrete | |
| CN115536302A (en) | Silicomanganese slag-based super early-strength shotcrete admixture and shotcrete | |
| CN112960924B (en) | High-chlorine fly ash cementing material and preparation method thereof | |
| CN115403312A (en) | High-sulfur tailing cementing material and preparation method and application thereof | |
| CN115259766A (en) | Alkali-activated fly ash concrete and preparation method thereof | |
| CN114436612A (en) | Gypsum-based self-leveling mortar composition | |
| CN116409948A (en) | Low-carbon composite cementing material based on regenerated micro powder, and preparation method and application thereof | |
| Sherif | Utilization of metakaolin on sustainable concrete properties | |
| CN110590311A (en) | Cement and preparation method thereof | |
| CN112429985B (en) | Moderate heat portland cement prepared by utilizing industrial waste residues and preparation method thereof | |
| CN116462440B (en) | Low-shrinkage industrial solid waste excitant and preparation method and application thereof | |
| CN112341085B (en) | Concrete and preparation method thereof | |
| CN115259729B (en) | Sulfurized phosphogypsum-slag cementing material modifier, application thereof and composition of same |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20221101 |