CN116730693A - Low-shrinkage high-adhesion alkali slag cement-based repair material and preparation method thereof - Google Patents
Low-shrinkage high-adhesion alkali slag cement-based repair material and preparation method thereof Download PDFInfo
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- CN116730693A CN116730693A CN202310374948.2A CN202310374948A CN116730693A CN 116730693 A CN116730693 A CN 116730693A CN 202310374948 A CN202310374948 A CN 202310374948A CN 116730693 A CN116730693 A CN 116730693A
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- 239000002893 slag Substances 0.000 title claims abstract description 139
- 239000000463 material Substances 0.000 title claims abstract description 131
- 239000003513 alkali Substances 0.000 title claims abstract description 111
- 230000008439 repair process Effects 0.000 title claims abstract description 105
- 239000004568 cement Substances 0.000 title claims abstract description 102
- 238000002360 preparation method Methods 0.000 title abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000004567 concrete Substances 0.000 claims abstract description 32
- 239000004576 sand Substances 0.000 claims abstract description 30
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 29
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 29
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000839 emulsion Substances 0.000 claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims description 45
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 33
- 238000003756 stirring Methods 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 16
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 15
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 15
- 235000011152 sodium sulphate Nutrition 0.000 claims description 15
- 239000002699 waste material Substances 0.000 claims description 13
- 229920005646 polycarboxylate Polymers 0.000 claims description 12
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical group C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 11
- 239000000176 sodium gluconate Substances 0.000 claims description 11
- 229940005574 sodium gluconate Drugs 0.000 claims description 11
- 235000012207 sodium gluconate Nutrition 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 8
- 235000010755 mineral Nutrition 0.000 claims description 8
- 239000011707 mineral Substances 0.000 claims description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000006227 byproduct Substances 0.000 claims description 4
- 239000000499 gel Substances 0.000 claims description 4
- 239000000741 silica gel Substances 0.000 claims description 4
- 229910002027 silica gel Inorganic materials 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 3
- 238000010000 carbonizing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 229910052925 anhydrite Inorganic materials 0.000 claims 1
- 238000009776 industrial production Methods 0.000 abstract description 3
- 239000002910 solid waste Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 39
- 239000002994 raw material Substances 0.000 description 30
- 230000000694 effects Effects 0.000 description 15
- 238000012360 testing method Methods 0.000 description 14
- 239000000853 adhesive Substances 0.000 description 12
- 230000001070 adhesive effect Effects 0.000 description 12
- 238000003763 carbonization Methods 0.000 description 12
- 230000002411 adverse Effects 0.000 description 8
- 238000005303 weighing Methods 0.000 description 8
- 239000004566 building material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 229910052602 gypsum Inorganic materials 0.000 description 4
- 239000010440 gypsum Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 3
- KZEVSDGEBAJOTK-UHFFFAOYSA-N 1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-2-[5-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]-1,3,4-oxadiazol-2-yl]ethanone Chemical compound N1N=NC=2CN(CCC=21)C(CC=1OC(=NN=1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)=O KZEVSDGEBAJOTK-UHFFFAOYSA-N 0.000 description 2
- LDXJRKWFNNFDSA-UHFFFAOYSA-N 2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound C1CN(CC2=NNN=C21)CC(=O)N3CCN(CC3)C4=CN=C(N=C4)NCC5=CC(=CC=C5)OC(F)(F)F LDXJRKWFNNFDSA-UHFFFAOYSA-N 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 150000004683 dihydrates Chemical class 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- SQMWSBKSHWARHU-SDBHATRESA-N n6-cyclopentyladenosine Chemical compound O[C@@H]1[C@H](O)[C@@H](CO)O[C@H]1N1C2=NC=NC(NC3CCCC3)=C2N=C1 SQMWSBKSHWARHU-SDBHATRESA-N 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 229920000876 geopolymer Polymers 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- 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)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of concrete repair materials, and particularly relates to a low-shrinkage high-adhesion alkali slag cement-based repair material and a preparation method thereof. The low-shrinkage high-adhesion alkali slag cement-based repair material comprises the following components in parts by mass: 25-35 parts of water, 25-30 parts of water glass, 100 parts of blast furnace slag micropowder, 10-20 parts of pre-carbonized regenerated micropowder, 5-10 parts of fluorgypsum, 150-300 parts of sand, 0.1-2 parts of polyacrylic emulsion, 0.3-1 part of water reducer, 0.5-2.0 parts of early strength agent and 0.1-1.0 part of retarder. The low-shrinkage high-adhesion alkali slag cement-based repair material has low shrinkage and high adhesion strength, and the main material mainly comprises solid wastes, is low in cost and easy to obtain, and is suitable for industrial production.
Description
Technical Field
The invention belongs to the technical field of concrete repair materials, and particularly relates to a low-shrinkage high-adhesion alkali slag cement-based repair material and a preparation method thereof.
Background
Once cracked, concrete structures can severely impact their durability. The concrete is a heterogeneous and inhomogeneous brittle material, the generation of cracks is almost unavoidable, and is determined by the physical properties and mechanical properties, the concrete structure is affected by adverse factors such as fatigue damage, temperature, shrinkage, uneven settlement and the like in the use process, and deformation and damage accumulation can be generated in the concrete due to the difference of the properties such as the thermal expansion coefficient, the elastic modulus and the like of various materials in the concrete, so that tiny cracks and local damage can be inevitably generated. The appearance is affected by the generation of concrete cracks, more importantly, the bending strength is greatly reduced, and the concrete cracks are CO 2 、NO x 、H 2 S, water, sulfate, chloride and the like attack the concrete to provide a channel, greatly affecting the service life of the structure. Cracks are a precursor to failure, and when the size and number of cracks develop to some extent, they will lead to structural failure.
Alkali-activated gelling materials are a new type of inorganic nonmetallic material developed in recent years, which are prepared from an alkali-activator and an inorganic gelling material having activity, also called geopolymer. The alkali-activated cementing material does not need to calcine clinker, the carbon dioxide emission can be reduced by about 80% compared with ordinary silicate cement during preparation, and industrial wastes can be largely utilized, so that the alkali-activated cementing material is an environment-friendly building material. The alkali-activated cementing material has the characteristics of early strength, corrosion resistance, water resistance, permeability resistance, high temperature resistance, simple production process, good compactness and the like, and has been developed and applied to the fields of novel ceramic materials, concrete rapid repair materials, heat-insulating coatings, corrosion-resistant coatings and the like.
The slag is used as one of alkali-activated cementing materials and is powder obtained by processing blast furnace slag. However, the alkali-activated slag material has the problems of high brittleness, high shrinkage, low bonding strength and the like, and is difficult to repair concrete cracks effectively.
Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a low-shrinkage high-adhesion alkali slag cement-based repair material and a preparation method thereof, which are used for solving or improving the problems that the alkali slag material has high shrinkage or low adhesion strength and is difficult to repair concrete cracks effectively.
In order to achieve the above object, the present invention provides the following technical solutions: the low-shrinkage high-adhesion alkali slag cement-based repair material comprises the following components in parts by mass: 25-35 parts of water, 25-30 parts of water glass, 100 parts of blast furnace slag micropowder, 10-20 parts of pre-carbonized regenerated micropowder, 5-10 parts of fluorgypsum, 150-300 parts of sand, 0.1-2 parts of polyacrylic emulsion, 0.3-1 part of water reducer, 0.5-2.0 parts of early strength agent and 0.1-1.0 part of retarder.
Preferably, the water glass has a modulus of 1.2-1.8.
Preferably, the blast furnace slag micropowder is S95 grade blast furnace slag micropowder and more, and the specific surface area of the blast furnace slag micropowder is more than or equal to 350m 2 /kg。
Preferably, the pre-carbonized regenerated micro powder is obtained by carbonizing waste concrete regenerated micro powder, and the main mineral composition of the pre-carbonized regenerated micro powder comprises calcium carbonate, silica gel and aluminum gel.
Preferably, the fluorogypsum is a byproduct for preparing hydrofluoric acid, the main mineral component of the fluorogypsum is type II anhydrous gypsum, and the particle size is less than or equal to 75 mu m.
Preferably, the sand is natural sand or machine-made sand with the particle size less than or equal to 2.5 mm.
Preferably, the polyacrylic emulsion has a solids content of 30%.
Preferably, the water reducing agent is polycarboxylate water reducing agent powder, the early strength agent is sodium sulfate and/or sodium carbonate, the retarder is sodium gluconate, and the water is clean tap water.
Preferably, the expansion degree of the low-shrinkage high-adhesion alkali slag cement-based repair material is more than or equal to 250mm within 20 min; the 3d compressive strength of the low-shrinkage high-adhesion alkali slag cement-based repair material is 40-50MPa, and the 28d compressive strength is 50-70MPa; the 28d shrinkage rate of the low shrinkage high adhesion alkali slag cement-based repair material is less than or equal to 0.15%, and the 28d adhesion strength is 2.5-3.5MPa.
Preferably, the expansion degree of the low-shrinkage high-adhesion alkali slag cement-based repair material is more than or equal to 250mm within 20 min; the 3d compressive strength of the low shrinkage high adhesion alkali slag cement-based repair material is 43.3-51.8MPa, and the 28d compressive strength is 56.4-64.1MPa; the 28d shrinkage rate of the low shrinkage high adhesion alkali slag cement-based repair material is less than or equal to 0.15 percent, and the 28d adhesion strength is 2.39-3.62MPa.
The invention also provides a preparation method of the low-shrinkage high-adhesion alkali slag cement-based repair material, which adopts the following technical scheme: the preparation method of the low-shrinkage high-adhesion alkali slag cement-based repair material comprises the following steps: (1) And sequentially adding the water, the water glass, the blast furnace slag micropowder, the pre-carbonized regenerated micropowder, the fluorogypsum, the sand, the polyacrylic emulsion, the water reducing agent, the early strength agent and the retarder into a stirring pot, and stirring until the mixture is uniform, thus obtaining the low-shrinkage high-adhesion alkali slag cement-based repair material.
The beneficial effects are that:
1. the main raw material of the invention is a general material of building materials, and the main material is mainly solid waste, so the invention has low cost, is easy to obtain, and is suitable for industrial production.
2. On the basis of the problems of alkali slag cement, the invention adopts the pre-carbonized regenerated micro powder to increase the compressive strength, adopts the fluorgypsum to reduce the shrinkage rate, adopts the polyacrylic emulsion to improve the bonding strength, and adopts the water reducing agent, the early strength agent and the retarder to ensure the construction performance.
3. The alkali slag-based repair material has good perfusion performance, the expansion degree is not less than 250mm within twenty minutes, and the alkali slag-based repair material is not isolated and does not bleed; the high-strength steel has higher early strength and later strength, and the compressive strength of 3d and 28d reach 40-50MPa and 50-70MPa respectively; low shrinkage, 28d shrinkage not greater than 0.15%; high adhesion and 28d adhesion strength of 2.5-3.5MPa.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
The present invention will be described in detail with reference to examples. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
Aiming at the problems of high shrinkage or low bonding strength and difficult effective repair of concrete cracks of the existing alkali slag material, the invention provides a low-shrinkage high-bonding alkali slag cement-based repair material, which comprises the following components in parts by mass: 25-35 parts (e.g., 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, or 35 parts), 25-30 parts (e.g., 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, or 30 parts) of water, 100 parts of blast furnace slag micropowder, 10-20 parts (e.g., 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, or 20 parts) of pre-carbonized micropowder, 5-10 parts (e.g., 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts) of fluorogypsum, 150-300 parts (e.g., 150 parts, 160 parts, 170 parts, 180 parts, 190 parts, 200 parts, 210 parts, 220 parts, 230 parts, 240 parts, 250 parts, 260 parts, 270 parts, 280 parts, 290 parts, or 300 parts) of a polyacrylic emulsion (e.g., 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1.0 part, 1.1 part, 1.2 part, 1.3 part, 1.4 part, 1.5 part, 1.6 part, 1.7 part, 1.8 part, 1.9 part or 2.0 parts), water reducer 0.3-1 part (e.g., 0.3 part, 0.4 part, 0.5 part, 0.60 part, 0.7 part, 0.8 part, 0.9 part or 1.0 part), early strength agent 0.5-2.0 parts (e.g., 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2.0) and retarder 0.1-1.0 (e.g., 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1.0).
The pre-carbonized regenerated micro powder in the raw materials of the low-shrinkage high-adhesion alkali slag cement-based repair material has the main mineral components of calcium carbonate particles, silica gel, aluminum gel and the like, has larger specific surface area, and can be hydrated in an alkali slag cement system to generate hydrated calcium silicate, hydrated calcium carbonate and the like, thereby showing better activity and improving the early strength and the later strength of the material; the polyacrylic emulsion in the adopted raw materials not only fills the gaps between amorphous gelled substances, but also has better bonding effect with the repaired concrete surface, and a network structure is formed after hardening, so that the bonding strength is enhanced, the generation of microcracks is reduced, the evaporation and the dissipation of moisture in a matrix are delayed, and the shrinkage rate is reduced; under the excitation action of sodium sulfate or sodium carbonate, the fluorine gypsum in the adopted raw materials firstly generates dihydrate gypsum, and secondly, the gypsum reacts with calcium aluminate hydrate to generate ettringite, so that an expansion effect is generated, the shrinkage of the calcium aluminate is compensated, and the effect of reducing the shrinkage rate is achieved.
The invention takes blast furnace slag micropowder, precarbonized regenerated micropowder, fluorogypsum and the like as main raw materials, does not need to calcine clinker, reduces the carbon dioxide emission by nearly 80 percent compared with ordinary Portland cement during preparation, can largely utilize industrial wastes, and is an environment-friendly building material. In addition, the alkali-activated slag cementing material has the characteristics of early strength, corrosion resistance, water resistance, permeability resistance, high temperature resistance, simple production process, good compactness and the like; the performance of the alkali-activated slag cementing material is further improved by adding pre-carbonized regenerated micro powder, fluorgypsum, polyacrylic emulsion and the like for modification, and the alkali-activated slag repairing material with high strength, good durability, high bonding strength and small shrinkage rate can be prepared by optimizing the proportioning design; the raw materials used are wide in sources and low in preparation cost, and the defect of high cost in the prior art is overcome.
In preferred embodiments of the invention, the water glass has a modulus of 1.2 to 1.8 (e.g., 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, or 1.8).
In the preferred embodiment of the invention, the blast furnace slag micropowder is S95 grade or more blast furnace slag micropowder, and the specific surface area of the blast furnace slag micropowder is more than or equal to 350m 2 /kg. Preferably, the blast furnace slag micropowder is Chinese building material assistantThe blast furnace slag micropowder of S95 and above specified in T/CCPA 12-2020, quality rating of granulated blast furnace slag powder for Cement and concrete, will be standardized.
In the preferred embodiment of the invention, the pre-carbonized regenerated micro powder is obtained by carbonizing waste concrete regenerated micro powder, and the main mineral composition of the pre-carbonized regenerated micro powder comprises calcium carbonate, silica gel and aluminum gel.
In a preferred embodiment of the present invention, the pre-carbonized regenerated micro powder is prepared by a method comprising the steps of: placing the recycled micro powder of the waste concrete (particles with the particle size smaller than 75 mu m generated by preparing the recycled aggregate from the waste concrete) into a concrete carbonization box for carbonization maintenance (during the carbonization maintenance process, dropwise adding phenolphthalein solution into the recycled micro powder of the waste concrete, and when the phenolphthalein solution does not change color any more, the carbonization is complete); the carbonization curing temperature is 19-21 ℃ (e.g., 19 ℃, 20 ℃ or 21 ℃), the humidity is 67% -73% (e.g., 67%, 68%, 69%, 70%, 71%, 72% or 73%), and the CO 2 The concentration is 19% -21% (e.g., 19%, 20%, or 21%). Wherein the recycled micro powder of the waste concrete refers to a byproduct (mostly cement slurry components in the waste concrete) of the recycled aggregate prepared from the waste concrete, and the particle size is less than 75 mu m.
In the preferred embodiment of the invention, the fluorogypsum is a byproduct for preparing hydrofluoric acid, the main mineral component of the fluorogypsum is type II anhydrous gypsum, and the particle size is less than or equal to 75 mu m. If the particle size of the fluorogypsum is too large, firstly, the dehydrate of the fluorogypsum can be adversely affected to generate dihydrate gypsum, and secondly, the speed of generating ettringite by the fluorogypsum and the hydrated calcium aluminate can be affected.
In a preferred embodiment of the invention, the sand is natural sand or machine-made sand with the particle size less than or equal to 2.5 mm.
In a preferred embodiment of the invention, the solids content of the polyacrylic emulsion is 30%.
In the preferred embodiment of the invention, the water reducer is polycarboxylate water reducer powder, the early strength agent is sodium sulfate and/or sodium carbonate, the retarder is sodium gluconate, and the water is clean tap water.
In the preferred embodiment of the invention, the expansion degree of the low-shrinkage high-adhesion alkali slag cement-based repair material is more than or equal to 250mm within 20 min; the 3d compressive strength of the low-shrinkage high-adhesion alkali slag cement-based repairing material is 30-50MPa, and the 28d compressive strength is 50-70MPa; the 28d shrinkage rate of the low shrinkage high adhesion alkali slag cement-based repair material is less than or equal to 0.15 percent, and the 28d adhesion strength is 1.5 to 3.5MPa.
In the preferred embodiment of the invention, the expansion degree of the low-shrinkage high-adhesion alkali slag cement-based repair material is more than or equal to 250mm within 20 min; the 3d compressive strength of the low shrinkage high adhesion alkali slag cement-based repair material is 43.3-51.8MPa, and the 28d compressive strength is 56.4-64.1MPa; the 28d shrinkage rate of the low shrinkage high adhesion alkali slag cement-based repair material is less than or equal to 0.15 percent, and the 28d adhesion strength is 2.39-3.62MPa.
The invention also provides a preparation method of the low-shrinkage high-adhesion alkali slag cement-based repair material, which comprises the following steps: (1) Sequentially adding water, water glass, blast furnace slag micropowder, pre-carbonized regenerated micropowder, fluorogypsum, sand, polyacrylic emulsion, water reducer, early strength agent and retarder into a stirring pot, and stirring until uniformity is achieved, thus obtaining the low-shrinkage high-adhesion alkali slag cement-based repair material. The preparation method of the low-shrinkage high-adhesion alkali slag cement-based repair material has the advantages of simple equipment, convenient operation and easy industrial production.
The low shrinkage and high adhesion alkali slag cement-based repair material and the method of preparing the same according to the present invention will be described in detail by way of specific examples.
The starting materials used in the following examples:
the pre-carbonized regenerated micro powder is prepared by the following method: placing the recycled micro powder of the waste concrete (namely, the micro powder generated by preparing the recycled aggregate from the waste concrete, wherein the main component of the recycled micro powder is cement paste components in the waste concrete and is particles with the particle size of less than 75 mu m) into a concrete carbonization box for carbonization and curing for 6 hours (dropping phenolphthalein solution does not change color when the carbonization and curing are carried out for 6 hours, so that carbonization is complete); the carbonization curing temperature is 19-21 ℃, the humidity is 67-73%, and the CO is 2 The concentration is 19% -21%.
Blast furnace slag micropowder: the blast furnace slag micropowder is S95 and above mineral powder specified in the China building Material Association Standard (quality rating of granulated blast furnace slag powder for Cement and concrete) T/CCPA 12-2020;
fluorogypsum: particle size is less than 75 μm;
water glass: the Baume degree is 40;
polyacrylic emulsion: the solid content is 30%;
sand: natural sand with the grain diameter of less than 2.5 mm;
water reducing agent: and (3) a polycarboxylate water reducing agent powder.
Example 1
The low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment comprises the following components in parts by mass:
30 parts of water, 100 parts of blast furnace slag micropowder, 15 parts of precarbonized regenerated micropowder, 7.5 parts of fluorgypsum, 200 parts of sand, 1.0 part of polyacrylic emulsion, 0.5 part of water reducer, 1.2 parts of sodium sulfate, 0.5 part of retarder (sodium gluconate) and water glass, so as to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
Wherein, the water glass adopts 26 parts, 27 parts, 28 parts or 29 parts of water glass with the modulus of 1.5, 27 parts of water glass with the modulus of 1.3, 27 parts of water glass with the modulus of 1.5 and 27 parts of water glass with the modulus of 1.7 respectively.
The preparation method of the low-shrinkage high-adhesion alkali slag cement-based repair material comprises the following steps: and respectively weighing the raw materials according to the mass parts, putting the raw materials into a stirring pot, and stirring the raw materials to be uniform to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
The fluidity, compressive strength, adhesive strength and shrinkage ratio of 28d of the low shrinkage high adhesion alkali slag cement-based repair material of this example were respectively tested, and the test results are shown in table 1:
TABLE 1 Effect of Water glass on repair Material Performance
As can be seen from table 1, as the water glass fraction increases, the mobility of the repair material becomes larger and larger; the compressive strength of both 3d and 28d showed a tendency to increase and decrease, with 27 parts being the most preferred; the adhesive strength of 28d is also the same; the shrinkage of 28d showed a gradual increase, but was less than 0.15% in the range of the blending amount. As the modulus of the water glass increases, the fluidity gradually increases; the compressive strength of both 3d and 28d show a tendency to increase and then decrease, with a modulus of 1.5 being preferred; the adhesive strength of 28d is also the same; the shrinkage of 28d then shows a gradual decrease.
Example 2
The low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment comprises the following components in parts by mass:
30 parts of water, 27 parts of water glass with the modulus of 1.5, 100 parts of blast furnace slag micropowder, 7.5 parts of fluorgypsum, 200 parts of sand, 1.0 part of polyacrylic emulsion, 0.5 part of water reducer, 1.2 parts of sodium sulfate, 0.5 part of retarder (sodium gluconate) and pre-carbonized regenerated micropowder to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
Wherein, the parts of the pre-carbonized regenerated micro powder are respectively 10 parts, 12 parts, 15 parts, 17 parts and 20 parts.
The preparation method of the low-shrinkage high-adhesion alkali slag cement-based repair material comprises the following steps: and respectively weighing the raw materials according to the mass parts, putting the raw materials into a stirring pot, and stirring the raw materials to be uniform to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
The fluidity, compressive strength, adhesive strength and shrinkage of 28d of the low shrinkage high adhesion alkali slag cement-based repair material of this example were respectively tested, and the test results are shown in table 2:
TABLE 2 Effect of Pre-carbonized regenerated micropowder on repair Material Performance
As can be seen from table 2, the fluidity showed a tendency to decrease gradually as the number of the pre-carbonized regenerated fine powder increases; the compressive strengths of 3d and 28d show a tendency to increase and then decrease; 28d exhibit a tendency to decrease gradually; the shrinkage of 28d also showed a gradual decrease.
Example 3
The low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment comprises the following components in parts by mass:
30 parts of water, 27 parts of water glass with the modulus of 1.5, 100 parts of blast furnace slag micro powder, 15 parts of pre-carbonized regenerated micro powder, 200 parts of sand, 1.0 part of polyacrylic emulsion, 0.5 part of water reducer, 1.2 parts of sodium sulfate, 0.5 part of retarder (sodium gluconate) and fluorogypsum to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
Wherein the parts of the fluorogypsum are 5 parts, 7.5 parts and 10 parts respectively.
The preparation method of the low-shrinkage high-adhesion alkali slag cement-based repair material comprises the following steps: and respectively weighing the raw materials according to the mass parts, putting the raw materials into a stirring pot, and stirring the raw materials to be uniform to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
The fluidity, compressive strength, adhesive strength and shrinkage ratio of 28d of the low shrinkage high adhesion alkali slag cement-based repair material of this example were respectively tested, and the test results are shown in table 3:
TABLE 3 Effect of fluorogypsum on repair Material Performance
As can be seen from table 3, the fluidity showed a tendency to decrease gradually as the fraction of the fluorogypsum increases; the compressive strengths of 3d and 28d show a tendency to gradually increase; 28d exhibit a tendency to increase gradually; the shrinkage of 28d also showed a gradual decrease.
Example 4
The low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment comprises the following components in parts by mass:
30 parts of water, 27 parts of water glass with the modulus of 1.5, 100 parts of blast furnace slag micro powder, 15 parts of pre-carbonized regenerated micro powder, 7.5 parts of fluorgypsum, 1.0 part of polyacrylic emulsion, 0.5 part of water reducer, 1.2 parts of sodium sulfate, 0.5 part of retarder (sodium gluconate) and sand to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
Wherein the parts of sand are 150 parts, 200 parts, 250 parts and 300 parts respectively.
The preparation method of the low-shrinkage high-adhesion alkali slag cement-based repair material comprises the following steps: and respectively weighing the raw materials according to the mass parts, putting the raw materials into a stirring pot, and stirring the raw materials to be uniform to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
The fluidity, compressive strength, adhesive strength and shrinkage of 28d of the low shrinkage high adhesion alkali slag cement-based repair material of this example were respectively tested, and the test results are shown in table 4:
TABLE 4 Effect of sand on repair Material Performance
As can be seen from table 4, the fluidity showed a tendency to gradually decrease as the sand fraction increases; the compressive strengths of 3d and 28d show a tendency to gradually increase; 28d exhibit a tendency to decrease gradually; the shrinkage of 28d also showed a gradual decrease.
Example 5
The low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment comprises the following components in parts by mass:
30 parts of water, 27 parts of water glass with the modulus of 1.5, 100 parts of blast furnace slag micro powder, 15 parts of pre-carbonized regenerated micro powder, 7.5 parts of fluorgypsum, 200 parts of sand, 0.5 part of water reducer, 1.2 parts of sodium sulfate, 0.5 part of retarder (sodium gluconate) and polyacrylic emulsion to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
Wherein, the parts of the polyacrylic emulsion are respectively 0.1 part, 0.5 part, 1.0 part, 1.5 parts and 2.0 parts.
The preparation method of the low-shrinkage high-adhesion alkali slag cement-based repair material comprises the following steps: and respectively weighing the raw materials according to the mass parts, putting the raw materials into a stirring pot, and stirring the raw materials to be uniform to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
The fluidity, compressive strength, adhesive strength and shrinkage of 28d of the low shrinkage high adhesion alkali slag cement-based repair material of this example were respectively tested, and the test results are shown in table 5:
TABLE 5 influence of polyacrylic emulsion on repair Material Performance
As can be seen from table 5, the fluidity showed a tendency to gradually increase as the number of parts of the polyacrylic acid emulsion increases; the compressive strength of 3d and 28d tends to increase and decrease first; 28d exhibit a tendency to increase gradually; the shrinkage of 28d showed a tendency to decrease gradually.
Example 6
The low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment comprises the following components in parts by mass:
30 parts of water, 27 parts of water glass with the modulus of 1.5, 100 parts of blast furnace slag micro powder, 15 parts of pre-carbonized regenerated micro powder, 7.5 parts of fluorgypsum, 200 parts of sand, 1.0 part of polyacrylic emulsion, 1.2 parts of sodium sulfate, 0.5 part of retarder (sodium gluconate) and a polycarboxylate water reducer to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
Wherein, the parts of the polycarboxylate water reducer are respectively 0.3 part, 0.5 part, 0.75 part and 1.0 part.
The preparation method of the low-shrinkage high-adhesion alkali slag cement-based repair material comprises the following steps: and respectively weighing the raw materials according to the mass parts, putting the raw materials into a stirring pot, and stirring the raw materials to be uniform to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
The fluidity, compressive strength, adhesive strength and shrinkage of 28d of the low shrinkage high adhesion alkali slag cement-based repair material of this example were respectively tested, and the test results are shown in table 6:
TABLE 6 Effect of polycarboxylate Water reducers on repair Material Performance
As can be seen from table 6, as the fraction of the polycarboxylate water reducer increases, the fluidity tends to increase gradually; the compressive strengths of 3d and 28d show a tendency to decrease gradually; 28d exhibit a tendency to decrease gradually; the shrinkage of 28d showed a gradual increase trend.
Example 7
The low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment comprises the following components in parts by mass:
30 parts of water, 27 parts of water glass with the modulus of 1.5, 100 parts of blast furnace slag micro powder, 15 parts of pre-carbonized regenerated micro powder, 7.5 parts of fluorgypsum, 200 parts of sand, 1.0 part of polyacrylic emulsion, 0.5 part of polycarboxylate water reducer, 0.5 part of retarder (sodium gluconate) and sodium sulfate to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
Wherein, the parts of sodium sulfate are respectively 0.5 part, 0.8 part, 1.2 part, 1.6 part and 2.0 parts.
The preparation method of the low-shrinkage high-adhesion alkali slag cement-based repair material comprises the following steps: and respectively weighing the raw materials according to the mass parts, putting the raw materials into a stirring pot, and stirring the raw materials to be uniform to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
The fluidity, compressive strength, adhesive strength and shrinkage of 28d of the low shrinkage high adhesion alkali slag cement-based repair material of this example were respectively tested, and the test results are shown in table 7:
TABLE 7 Effect of early strength Agents on repair Material Performance
As can be seen from table 7, the fluidity showed a tendency to decrease gradually as the number of the early strength agent fractions increases; the 3d compressive strength shows a gradual increase trend, and the 28d compressive strength shows a trend of increasing and then decreasing; 28d exhibit a tendency to decrease gradually; the shrinkage of 28d showed a gradual increase trend.
Example 8
The low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment comprises the following components in parts by mass:
30 parts of water, 27 parts of water glass with the modulus of 1.5, 100 parts of blast furnace slag micro powder, 15 parts of pre-carbonized regenerated micro powder, 7.5 parts of fluorgypsum, 200 parts of sand, 1.0 part of polyacrylic emulsion, 0.5 part of polycarboxylate water reducer, 1.2 parts of sodium sulfate and retarder (sodium gluconate) to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
Wherein, the parts of retarder are 0.1 part, 0.3 part, 0.5 part, 0.75 part and 1.0 part respectively.
The preparation method of the low-shrinkage high-adhesion alkali slag cement-based repair material comprises the following steps: and respectively weighing the raw materials according to the mass parts, putting the raw materials into a stirring pot, and stirring the raw materials to be uniform to obtain the low-shrinkage high-adhesion alkali slag cement-based repair material of the embodiment.
The fluidity, compressive strength, adhesive strength and shrinkage of 28d of the low shrinkage high adhesion alkali slag cement-based repair material of this example were respectively tested, and the test results are shown in table 8:
TABLE 8 influence of retarder on repair Material Performance
As can be seen from table 8, the fluidity showed a tendency to gradually increase as the fraction of retarder increases; compressive strengths of 3d and 8d show a tendency to decrease gradually; 28d exhibit a tendency to increase gradually; the shrinkage of 28d showed a tendency to decrease gradually.
Comparative example 1
This comparative example differs from the low shrinkage high adhesion alkali slag cement-based repair material of No. 2 in example 1 (hereinafter simply referred to as examples 1-2) only in that: the water glass had a part of 20 and the remainder was identical to that of examples 1-2.
Comparative example 2
This comparative example differs from the low shrinkage high adhesion alkali slag cement-based repair material of No. 2 in example 1 (hereinafter simply referred to as examples 1-2) only in that: the modulus of the water glass was 2.2, the remainder being identical to examples 1-2.
Comparative example 3
This comparative example differs from the low shrinkage high cohesion alkali slag cement based repairing material of No. 3 in example 2 (hereinafter, simply referred to as examples 2 to 3) only in that: the parts of the pre-carbonized regenerated micropowder were 25 parts, the remainder were identical to those of examples 2-3.
Comparative example 4
This comparative example differs from the low shrinkage high cohesion alkali slag cement based repairing material of No. 2 in example 3 (hereinafter, simply referred to as example 3-2) only in that: 15 parts of fluorogypsum and the rest are identical to those of example 3-2.
Comparative example 5
This comparative example differs from the low shrinkage high cohesion alkali slag cement based repairing material of No. 3 in example 4 (hereinafter, simply referred to as examples 4 to 3) only in that: the parts of sand were 350 parts, the remainder remaining in accordance with examples 4-3.
Comparative example 6
This comparative example differs from the low shrinkage high cohesion alkali slag cement based repairing material of No. 3 in example 5 (hereinafter, simply referred to as examples 5 to 3) only in that: the parts of polyacrylic emulsion was 2.5 parts, the remainder being identical to examples 5-3.
Comparative example 7
This comparative example differs from the low shrinkage high cohesion alkali slag cement based repairing material of No. 2 in example 6 (hereinafter, simply referred to as example 6-2) only in that: the parts of the polycarboxylate water reducer were 0 parts, and the rest were the same as in example 6-2.
Comparative example 8
This comparative example differs from the low shrinkage high cohesion alkali slag cement based repairing material of No. 3 in example 7 (hereinafter, simply referred to as examples 7 to 3) only in that: the parts of sodium sulfate were 0 parts, the remainder being identical to those of examples 7-3.
Comparative example 9
This comparative example differs from the low shrinkage high cohesion alkali slag cement based repairing material of No. 3 in example 8 (hereinafter, simply referred to as examples 8-3) only in that: the retarder was 0 parts, the remainder remaining the same as in examples 8-3.
Comparative example 10
This comparative example differs from the low shrinkage high cohesion alkali slag cement based repairing material of No. 1 in example 3 (hereinafter, simply referred to as example 3-1) only in that: the part of fluorogypsum was 0 part, and the rest was the same as in example 3-1.
Comparative example 11
This comparative example differs from the low shrinkage, high adhesion alkali slag cement-based repair material of example 3-1 only in that: the particle size of the fluorogypsum was 100. Mu.m, and the remainder was the same as in example 3-1.
Comparative example 12
This comparative example differs from the low shrinkage high cohesion alkali slag cement based repairing material of the No. 1 in the example 2 (hereinafter, simply referred to as the example 2-1) only in that: the parts of the pre-carbonized regenerated fine powder were 0 parts, and the rest was the same as in example 2-1.
Comparative example 13
This comparative example differs from the low shrinkage, high adhesion alkali slag cement-based repair material of example 2-1 only in that: the regenerated fine powder of the waste concrete was used without carbonization, and the rest was the same as in example 2-1.
The performance of the repair material of the comparative example was tested and compared with the corresponding example, and the results are shown in table 9 below:
TABLE 9
As can be seen from the data in table 9, comparative examples 1 and 2 illustrate that the modulus and the parts of the water glass vary with a large influence on the resistance to pressure and the adhesive strength; comparative example 3 shows that the increase of the precarbonated regenerated micropowder has adverse effects on the fluidity, compressive strength and bonding strength; comparative example 4 shows that an increase in the fraction of the fluorogypsum adversely affects the fluidity and the compressive strength, but reduces the shrinkage at the shrinkage of 28 d; comparative example 5 illustrates that excessive sand fraction adversely affects the fluidity, compressive strength, bond strength, but reduces the 28d shrinkage; comparative example 6 illustrates that an excessive fraction of the polyacrylic emulsion, while favorable for fluidity and shrinkage of 28d, adversely affects the resistance to pressure; comparative example 7 illustrates that the polycarboxylate water reducer has a significant effect on fluidity, but a small effect on other properties; comparative example 8 illustrates that without adding sodium sulfate, the compressive strength is reduced and the shrinkage of 28d is increased; comparative example 9 illustrates that if retarder is not added, the fluidity loss at 20min is significantly increased, but the influence on other properties is smaller; comparative example 10 illustrates that not only does the shrinkage of 28d increase significantly, but also the compressive resistance is adversely affected when the fluorogypsum is not included; comparative example 11 shows that when the particle size of the fluorogypsum is large, not only the shrinkage of 28d is significantly increased, but also the compressive strength and the adhesive strength are adversely affected; comparative example 12 shows that when the pre-carbonized regenerated fine powder is not added, not only the compressive strength is small, but also the shrinkage of 28d is increased; comparative example 13 shows that the regenerated fine powder without carbonization pretreatment does not exert an enhancement effect on the compressive strength of 3d and 28 d.
Remarks: the fluidity, compressive strength and 28d shrinkage in tables 1-9 above were all measured with reference to the building industry standard for reinforcing steel bar joint sleeve grouting, JC/T408-2019;
the 28d bonding strength is given by a bonding flexural test, a mortar test block formed by ordinary Portland cement is prepared in advance in the test, the test block is sawed into two identical parts by an electric saw when the test block is cured to 28d, the cross section is notched to a depth of 2-3mm, the biting force of a bonding surface is increased, the repair material is poured, and the flexural strength is tested on a flexural tester after the test block is cured to a specified age in a standard curing room.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The low-shrinkage high-adhesion alkali slag cement-based repair material is characterized by comprising the following components in parts by mass: 25-35 parts of water, 25-30 parts of water glass, 100 parts of blast furnace slag micropowder, 10-20 parts of pre-carbonized regenerated micropowder, 5-10 parts of fluorgypsum, 150-300 parts of sand, 0.1-2 parts of polyacrylic emulsion, 0.3-1 part of water reducer, 0.5-2.0 parts of early strength agent and 0.1-1.0 part of retarder.
2. The low shrinkage high adhesion alkali slag cement-based repair material of claim 1, wherein the water glass has a modulus of 1.2 to 1.8.
3. The low shrinkage high adhesion alkali slag cement-based repair material according to claim 1, wherein the blast furnace slag micropowder is a grade S95 blast furnace slag micropowder or more, and the specific surface area of the blast furnace slag micropowder is not less than 350m 2 /kg。
4. The low shrinkage high adhesion alkali slag cement-based repair material according to claim 1, wherein the pre-carbonized regenerated fine powder is obtained by carbonizing waste concrete-based regenerated fine powder, and the main mineral composition thereof includes calcium carbonate, silica gel and alumina gel.
5. The low shrinkage high adhesion alkali slag cement-based repair material according to claim 1, wherein the fluorogypsum is a byproduct of preparing hydrofluoric acid, the main mineral component of which is type II anhydrite, and the particle size is less than or equal to 75 μm.
6. The low shrinkage high adhesion alkali slag cement-based repair material of claim 1, wherein the sand is natural sand or machine-made sand having a particle size of 2.5mm or less.
7. The low shrinkage high adhesion alkali slag cement-based repair material of claim 1, wherein the polyacrylic emulsion has a solids content of 30%.
8. The low shrinkage high adhesion alkali slag cement-based repair material of claim 1, wherein the water reducing agent is polycarboxylate water reducing agent powder, the early strength agent is sodium sulfate and/or sodium carbonate, the retarder is sodium gluconate, and the water is clean tap water.
9. The low shrinkage high adhesion alkali slag cement-based repair material according to any one of claims 1 to 8, wherein the low shrinkage high adhesion alkali slag cement-based repair material has an expansion of not less than 250mm within 20 minutes;
the 3d compressive strength of the low-shrinkage high-adhesion alkali slag cement-based repair material is 40-50MPa, and the 28d compressive strength is 50-70MPa;
the 28d shrinkage rate of the low shrinkage high adhesion alkali slag cement-based repair material is less than or equal to 0.15%, and the 28d adhesion strength is 2.5-3.5MPa.
10. The method for producing a low shrinkage high adhesion alkali slag cement-based repair material according to any one of claims 1 to 9, comprising the steps of:
(1) And sequentially adding the water, the water glass, the blast furnace slag micropowder, the pre-carbonized regenerated micropowder, the fluorogypsum, the sand, the polyacrylic emulsion, the water reducing agent, the early strength agent and the retarder into a stirring pot, and stirring until the mixture is uniform, thus obtaining the low-shrinkage high-adhesion alkali slag cement-based repair material.
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