CN114873986A - Cement-based crack repair slurry and preparation method thereof - Google Patents
Cement-based crack repair slurry and preparation method thereof Download PDFInfo
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- CN114873986A CN114873986A CN202210718205.8A CN202210718205A CN114873986A CN 114873986 A CN114873986 A CN 114873986A CN 202210718205 A CN202210718205 A CN 202210718205A CN 114873986 A CN114873986 A CN 114873986A
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- 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
- C04B28/34—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 cold phosphate binders
- C04B28/344—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 cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
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- 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
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
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- 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
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- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the field of concrete, and particularly discloses cement-based crack repair slurry and a preparation method thereof. The raw material of the cement-based crack repair slurry comprises potassium magnesium phosphate cement; water; fine aggregate; coarse aggregate; water glass; a water repellent; the potassium magnesium phosphate cement comprises the following raw materials in parts by weight: magnesium oxide; potassium dihydrogen phosphate; a retarder; modifying graphene oxide; the preparation method comprises the following steps: mixing potassium magnesium phosphate cement, water glass and water to form slurry A, and mixing a waterproof agent and water to form slurry B; the slurry A is stirred uniformly, then the fine aggregate and the coarse aggregate are respectively added and stirred uniformly, finally the slurry B is added and stirred uniformly to obtain the cement-based crack repairing slurry. It has the advantages of good cohesiveness and high durability.
Description
Technical Field
The application relates to the field of concrete, in particular to cement-based crack repair slurry and a preparation method thereof.
Background
The cement concrete pavement has the advantages of high strength, strong load diffusion capacity, strong water damage resistance, good stability, simple construction process, low maintenance cost, wide material sources and the like, is widely applied to all levels of highways and urban roads, can be damaged to different degrees in the use process due to various adverse environmental conditions, and cracks are one of the main reasons for reducing the bearing capacity, durability, waterproofness and other performances of a concrete structure.
The existing cement-based repair materials for cracks of cement concrete pavements mainly comprise the following two types: 1) inorganic repair materials; ordinary portland cement concrete, composite portland cement, polymer modified cement, and the like; 2) organic repairing materials, acrylic esters, epoxy resins, silicone adhesives, polyurethane repairing materials, modified asphalt caulking materials and the like.
Although the organic patching material has higher elongation and better road performance of the repaired road, the pavement has short service time after being repaired due to the poor basal plane bonding property and easy falling-off problem, and part of the material has certain toxicity and influences the human health; although the inorganic repair material is inexpensive, it has disadvantages such as poor adhesion, large shrinkage, poor durability of the repaired road surface, and repeated repair of the damaged portion.
Disclosure of Invention
In order to solve the problems that the existing repairing material is poor in adhesive force and poor in durability and needs to be repaired repeatedly, the application provides cement-based crack repairing slurry and a preparation method thereof.
In a first aspect, the application provides a cement-based crack repair slurry, which adopts the following technical scheme:
the cement-based crack repair slurry comprises the following raw materials in parts by weight:
150 portions of potassium magnesium phosphate cement and 250 portions of magnesium phosphate cement;
200 portions of water and 300 portions of water;
130 portions and 190 portions of fine aggregate;
70-110 parts of coarse aggregate;
3-5 parts of water glass;
the potassium magnesium phosphate cement comprises the following raw materials in parts by weight: 80-120 parts of magnesium oxide; 40-60 parts of monopotassium phosphate; 20-40 parts of a retarder; 10-14 parts of modified graphene oxide.
By adopting the technical scheme, compared with cement-based materials and organic repairing materials, the magnesium phosphate cement has better matrix compatibility with portland cement-based materials, has good bonding force with old cement-based materials when used as a repairing material, has a thermal expansion coefficient close to that of portland cement concrete matrix, and has no problem of interface cracking caused by temperature change after repairing, because the magnesium phosphate cement has the defects of quick solidification and large brittleness, the slow setting time of the magnesium phosphate cement is regulated and controlled by compounding the slow setting agent in the raw materials, so that the magnesium phosphate cement is convenient to construct when quickly solidified in a preset time, meanwhile, the internal structure and compactness of the magnesium phosphate cement are changed by utilizing the modified graphene oxide, the compression resistance of the magnesium phosphate cement is enhanced, the strength and the compression resistance of the magnesium phosphate cement after solidification are further enhanced by arranging the fine aggregate and the coarse aggregate, and the water glass improves the fluidity of the magnesium phosphate cement, the potassium magnesium phosphate cement, the fine aggregate, the coarse aggregate, the water glass and the waterproof agent are matched to provide a cement-based repair base material with good comprehensive performances of environmental protection, good binding power, fluidity, strength and the like.
Preferably, the preparation method of the modified graphene oxide comprises the following steps:
the method comprises the following steps: adding graphene oxide into deionized water, setting the frequency of an ultrasonic instrument to be 100KHz, carrying out ultrasonic treatment for 1h, and adding iron salt after 0.5 h;
adding the urea solution into absolute ethyl alcohol to prepare a mixed solution;
step three: adding the mixed solution prepared in the step two into the solution obtained in the step one, uniformly mixing, pouring into a thermal reaction kettle, and preserving the temperature for 20min at 180 ℃;
step four: and (5) centrifuging the solution obtained in the step three, washing with water and ethanol, and finally drying to obtain the iron oxide graphene oxide composite material.
By adopting the technical scheme, after graphene oxide and ferric salt are uniformly dispersed in deionized water, urea is added to promote ferric salt hydrolysis to obtain ferric hydroxide, the ferric hydroxide is thermally decomposed in a thermal reaction kettle to obtain nanoscale ferric oxide particles, the ferric oxide particles are uniformly distributed on the graphene oxide under the action of ultrasound to obtain the ferric oxide-graphene oxide composite material, the ferric oxide-graphene oxide composite material is added into a potassium magnesium phosphate solution to physically fill gaps of cement, and meanwhile, the large specific surface area and a large number of active functional groups of the graphene oxide can adsorb a potassium magnesium phosphate cement hydration product MgKPO 4 ·6H 2 O (MKP), improves the internal bonding property of the magnesium potassium phosphate cement, and simultaneously, the hydration process of iron ions on the graphene oxide and the magnesium potassium phosphateThe generated phosphate radicals are complexed to generate ferric phosphate, the ferric phosphate is tightly bonded with MKP adsorbed on the surface of graphene oxide, gaps of potassium magnesium phosphate cement are further filled, the density of the cement is increased, and the bonding strength and the compressive property of the repair slurry are further improved.
Preferably, the retarder is one or more of borax, boric acid and boric acid ester.
By adopting the technical scheme, the boron-containing retarder is used, the retarding time is long, and workers can conveniently fill the cement-based crack repairing slurry into the crack before the slurry is solidified to perform repairing work.
Preferably, the retarder is borax.
By adopting the technical scheme, the cement-based crack repair slurry adopting borax magnesium potassium phosphate cement has excellent retarding time, and excellent bonding property, compression resistance and seepage-proofing property with an old cement base.
Preferably, the raw materials also comprise 5 to 9 weight parts of nano waterproof agent.
By adopting the technical scheme, the practicability of the nano waterproof agent effectively improves the waterproof and anti-permeability performance of the cement-based crack repairing slurry after solidification, and prolongs the service life of the repaired cement-based crack repairing slurry.
Preferably, the fine aggregate comprises the following raw materials in parts by weight: 30-50 parts of ground slag; 100 portions and 140 portions of fly ash.
By adopting the technical scheme, when the magnesium potassium phosphate cement is subjected to physical dense filling, the fly ash reduces the friction between slurry and aggregate, so that the magnesium potassium phosphate cement can be effectively dispersed, the flowability of the cement-based crack repair slurry is improved, meanwhile, the ball effect of the fly ash can improve the dispersibility of the modified graphene oxide in the cement, the improvement of the graphene oxide is promoted to play a role in enhancing the cement-based crack repair slurry, the compression resistance of the cement-based crack repair slurry is improved, the addition of the ground slag improves the flowability of the cement-based crack repair slurry, and simultaneously, the fly ash is added to improve the strength and the compression resistance of the cement-based crack repair slurry.
Preferably, the coarse aggregate comprises the following raw materials in parts by weight: 50-70 parts of sandstone and 20-40 parts of wollastonite.
By adopting the technical scheme, the compressive strength and the flexural strength are improved by adding the sandstone and the wollastonite.
In a second aspect, the application provides a preparation method of cement-based crack repair slurry, which adopts the following technical scheme:
a preparation method of cement-based crack repair slurry comprises the following steps:
s1: mixing potassium magnesium phosphate cement, water glass and water to form slurry A, and mixing a waterproof agent and water to form slurry B;
s2: the slurry A is stirred uniformly, then the fine aggregate and the coarse aggregate are respectively added and stirred uniformly, finally the slurry B is added and stirred uniformly to obtain the cement-based crack repairing slurry.
By adopting the technical scheme, the water glass and the magnesium potassium phosphate cement are mixed to obtain the cement slurry with good fluidity, then the fine aggregate and the coarse aggregate are added to improve the strength of the cement slurry, and finally the cement-based crack repair slurry with superior performance is obtained by uniformly stirring.
In summary, the present application has the following beneficial effects:
1. because the magnesium phosphate cement is used as the repairing material, the cement-based repairing base material has good binding power with the portland cement base, the thermal expansion coefficient of the magnesium phosphate cement is close to that of the concrete base, the problem of interface cracking of the repaired interface due to temperature change is solved, the service life is long, and the potassium magnesium phosphate cement, the fine aggregate, the coarse aggregate, the water glass and the waterproof agent are matched to provide the cement-based repairing base material with good comprehensive performances such as environmental protection, good binding power, fluidity, strength and the like.
2. In this application preferably adopt iron oxide graphite oxide alkene combined material to add and get into potassium magnesium phosphate cement, iron oxide particle evenly distributed is on graphite oxide, and graphite oxide can reduce and refine the clearance of cement, and iron ion and the phosphate radical complex that produces when potassium magnesium phosphate hydrate generate ferric phosphate simultaneously, fill the micropore and form compactness and crosslinked structure, further increase cement density, improve the bond strength and the compressive property of repairing the base member.
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 conducted under 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 raw materials used in this application are as follows:
magnesium oxide: dead-burned magnesium oxide with a specific surface area of 200-220 m 2 /kg；
Monopotassium phosphate, namely industrial monopotassium phosphate, wherein the main granularity of the monopotassium phosphate is 40/350-60/245 meshes/mu m;
grinding slag in a grinding way: the specific surface area is 520-540 m 2 /kg；
Fly ash: class II fly ash;
sand: machining sand with the particle size of 0.2-0.3 mm;
wollastonite: the particle size is 150-180 mm;
the preparation method of the modified graphene oxide comprises the following steps: the method comprises the following steps: adding 30mg of graphene oxide into 15ml of deionized water, setting the frequency of an ultrasonic instrument to be 100KHz, carrying out ultrasonic treatment for 1 hour, and adding 3mmol of iron salt after 0.5 hour; step two: adding 9mmol of urea solution into 15ml of absolute ethyl alcohol; step three: adding the solution prepared in the step two into the solution prepared in the step one, uniformly mixing, pouring into a thermal reaction kettle, and keeping the temperature at 180 ℃ for 25 min; step four: and (4) centrifuging the solution obtained in the step three, sequentially performing deionized water washing for 2 times and ethanol washing for 3 times, and finally drying in a constant-temperature drying box at 80 ℃ for 28 hours to obtain the iron oxide graphene oxide composite material.
A preparation method of cement-based crack repair slurry comprises the following steps: the method comprises the following steps: mixing potassium magnesium phosphate cement, water glass and water to form slurry A, and mixing a waterproof agent and water to form slurry B; step two: the slurry A is stirred uniformly, then the fine aggregate and the coarse aggregate are respectively added and stirred uniformly, finally the slurry B is added and stirred uniformly to obtain the cement-based crack repairing slurry.
Examples
Example 1
The cement-based crack repairing slurry is prepared from the following raw materials in parts by weight:
100 parts of magnesium oxide; 50 parts of monopotassium phosphate; 30 parts of borax; 12 parts of modified graphene oxide; 40 parts of ground slag; 60 parts of sand; 120 parts of fly ash and 30 parts of wollastonite; 4 parts of water glass; 8 parts of a nano waterproof agent.
Examples 2 to 3
The difference between the cement-based crack repair slurry and the cement-based crack repair slurry in example 1 is that the raw materials and the corresponding parts by weight are shown in Table 2.
TABLE 2 materials and weights (kg) thereof in examples 1-3
| Components | Example 1 | Example 2 | Example 3 |
| Magnesium oxide | 100 | 80 | 120 |
| Potassium dihydrogen phosphate | 50 | 40 | 60 |
| Borax | 30 | 20 | 40 |
| Water glass | 4 | 3 | 5 |
| Nano water-proofing agent | 8 | 5 | 9 |
| Finely ground slag | 40 | 30 | 50 |
| Sand | 60 | 50 | 70 |
| Fly ash | 120 | 100 | 140 |
| Wollastonite | 30 | 20 | 40 |
| Modified graphene oxide | 12 | 10 | 14 |
Example 4
The cement-based crack repair slurry is different from the cement-based crack repair slurry in example 1 in that the cement-based crack repair slurry is prepared from the following raw materials in parts by weight: 100 parts of magnesium oxide; 50 parts of monopotassium phosphate; 12 parts of modified graphene oxide; 40 parts of ground slag; 60 parts of sand; 120 parts of fly ash and 30 parts of wollastonite; 4 parts of water glass; 8 parts of a nano waterproof agent.
Example 5
The cement-based crack repair slurry is different from the cement-based crack repair slurry in example 1 in that the cement-based crack repair slurry is prepared from the following raw materials in parts by weight: 100 parts of magnesium oxide; 50 parts of monopotassium phosphate; 30 parts of borax; 12 parts of modified graphene oxide; 40 parts of ground slag; 60 parts of sand; 120 parts of fly ash and 30 parts of wollastonite; 8 parts of a nano waterproof agent.
Example 6
The cement-based crack repair slurry is different from the cement-based crack repair slurry in example 1 in that the cement-based crack repair slurry is prepared from the following raw materials in parts by weight: 100 parts of magnesium oxide; 50 parts of monopotassium phosphate; 30 parts of borax; 12 parts of modified graphene oxide; 60 parts of sand; 120 parts of fly ash and 30 parts of wollastonite; 4 parts of water glass; 8 parts of a nano waterproof agent.
Example 7
The cement-based crack repair slurry is different from the cement-based crack repair slurry in example 1 in that the cement-based crack repair slurry is prepared from the following raw materials in parts by weight: 100 parts of magnesium oxide; 50 parts of monopotassium phosphate; 30 parts of borax; 12 parts of modified graphene oxide; 40 parts of ground slag; 60 parts of sand; 30 parts of wollastonite; 4 parts of water glass; 8 parts of a nano waterproof agent.
Example 8
The cement-based crack repair slurry is different from the cement-based crack repair slurry in example 1 in that the cement-based crack repair slurry is prepared from the following raw materials in parts by weight: 100 parts of magnesium oxide; 50 parts of monopotassium phosphate; 30 parts of boric acid; 12 parts of modified graphene oxide; 40 parts of ground slag; 60 parts of sand; 120 parts of fly ash; 30 parts of wollastonite; 4 parts of water glass; 8 parts of a nano waterproof agent.
Example 9
The cement-based crack repair slurry is different from the cement-based crack repair slurry in example 1 in that the cement-based crack repair slurry is prepared from the following raw materials in parts by weight: 100 parts of magnesium oxide; 50 parts of monopotassium phosphate; 30 parts of boric acid ester; 12 parts of modified graphene oxide; 40 parts of ground slag; 60 parts of sand; 120 parts of fly ash; 30 parts of wollastonite; 4 parts of water glass; 8 parts of a nano waterproof agent.
Comparative example
Comparative example 1
The cement-based crack repair slurry is different from the cement-based crack repair slurry in example 1 in that the cement-based crack repair slurry is prepared from the following raw materials in parts by weight: 100 parts of magnesium oxide; 50 parts of monopotassium phosphate; 30 parts of borax; 40 parts of ground slag; 60 parts of sand; 120 parts of fly ash and 30 parts of wollastonite; 4 parts of water glass; 8 parts of a nano waterproof agent.
Comparative example 2
The cement-based crack repair slurry is different from the cement-based crack repair slurry in example 1 in that the cement-based crack repair slurry is prepared from the following raw materials in parts by weight: 190 parts of Portland cement; 40 parts of ground slag; 60 parts of sand; 120 parts of fly ash and 30 parts of wollastonite; 4 parts of water glass; 8 parts of a nano waterproof agent.
Comparative example 3
The cement-based crack repair slurry is different from the cement-based crack repair slurry in example 1 in that the cement-based crack repair slurry is prepared from the following raw materials in parts by weight: 100 parts of magnesium oxide; 50 parts of monopotassium phosphate; 30 parts of borax; 12 parts of graphene oxide; 40 parts of ground slag; 60 parts of sand; 120 parts of fly ash and 30 parts of wollastonite; 4 parts of water glass; 8 parts of a nano waterproof agent.
Performance test
1. And (3) testing mechanical properties: the compressive strength of the cement-based crack repair slurry in the examples and comparative examples was tested according to GB-T17671-1999 Cement mortar Strength test method.
2. And (3) testing the flow property: the fluidity of the cement-based crack repair slurry in the examples and comparative examples was tested according to GB/T8077-2012 "homogeneity test method for concrete admixtures".
3. And (3) testing the setting time: the setting time of the cement-based crack repair slurry in the examples and comparative examples was tested according to JGJ/T70-2009 Standard for test methods for basic Performance of building mortar, taking the time required for the penetration resistance value to reach 0.5MPa as the setting time of the mortar.
4. And (3) testing the bonding strength: the bond strength of the cement-based crack repair slurry in the examples and comparative examples was tested according to JGJ70-2009 Standard test method for basic Performance of building mortar.
TABLE 3
Combining examples 1 and 8-9 with table 3, it can be seen that the combination of setting time, compressive strength, bond strength, etc. using borax as retarder is significantly better than the combination of boric acid and borate as retarder.
Combining example 1 and example 5 with table 3, it can be seen that the fluidity and compressive strength of example 5 are significantly lower than those of example 1, and the addition of water glass improves the fluidity and compressive strength of the cement-based repair paste.
Combining example 1 and example 6 with table 3, it can be seen that the compressive strength of example 6 is significantly lower than that of example 1, indicating that the addition of ground slag improves the compressive strength of the cement-based repair slurry.
Combining example 1, example 7 and comparative example 1, and combining table 3, it can be seen that the setting time, compressive strength, fluidity and bond strength performance of example 7 are all lower than those of example 1, which shows that the comprehensive optimization of the cement-based repair slurry by adding the fly ash is demonstrated, and the compressive strength and bond strength of the cement-based repair slurry added with the modified graphene oxide are significantly improved in comparative example 1 compared with example 1.
It can be seen from the combination of example 1 and comparative example 2 and table 3 that the bond strength of comparative example 2 and the bond strength of example 1 are lower, indicating that the bond performance with old cement base is better when the magnesium potassium phosphate cement is used as the base material of cement-based repair paste, and the compressive strength of comparative example 2 is lower than that of example 1, indicating that the compressive strength of magnesium potassium phosphate cement can be effectively improved by adding modified graphene to the magnesium potassium phosphate cement raw material.
It can be seen by combining example 1 and comparative example 3 and table 3 that the compressive strength and the bonding strength of comparative example 3 are significantly lower than those of example 1, that is, the effect of adding the magnesium potassium phosphate cement to the modified graphene oxide is better than that of adding the magnesium potassium phosphate cement to the graphene oxide.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The cement-based crack repair slurry is characterized by comprising the following raw materials in parts by weight:
150 portions of potassium magnesium phosphate cement and 250 portions of magnesium phosphate cement;
200 portions of water and 300 portions of water;
130 portions and 190 portions of fine aggregate;
70-110 parts of coarse aggregate;
3-5 parts of water glass;
the potassium magnesium phosphate cement comprises the following raw materials in parts by weight: 80-120 parts of magnesium oxide; 40-60 parts of monopotassium phosphate; 20-40 parts of a retarder; 10-14 parts of modified graphene oxide.
2. The cement-based fracture repair slurry of claim 1, wherein: the preparation method of the modified graphene oxide comprises the following steps:
the method comprises the following steps: adding graphene oxide into deionized water, setting the frequency of an ultrasonic instrument to be 100KHz, carrying out ultrasonic treatment for 1h, and adding iron salt after 0.5 h;
adding the urea solution into absolute ethyl alcohol to prepare a mixed solution;
step three: adding the mixed solution prepared in the step two into the solution obtained in the step one, uniformly mixing, pouring into a thermal reaction kettle, and preserving the temperature for 20min at 180 ℃;
step four: and (5) centrifuging the solution obtained in the step three, washing with water and ethanol, and finally drying to obtain the iron oxide graphene oxide composite material.
3. The cement-based fracture repair slurry of claim 1, wherein: the retarder is one or more of borax, boric acid and boric acid ester.
4. The cement-based fracture repair slurry of claim 3, wherein: the retarder is borax.
5. The cement-based fracture repair slurry of claim 1, wherein: the raw materials also comprise 5 to 9 weight portions of nano waterproof agent.
6. The cement-based fracture repair slurry of claim 1, wherein: the fine aggregate comprises the following raw materials in parts by weight: 30-50 parts of ground slag; 100 portions and 140 portions of fly ash.
7. The cement-based fracture repair slurry of claim 1, wherein: the coarse aggregate comprises the following raw materials in parts by weight: 50-70 parts of sandstone and 20-40 parts of wollastonite.
8. A method of preparing a cement-based fracture-repair slurry as claimed in any one of claims 1 to 7, wherein: the preparation steps are as follows:
s1: mixing potassium magnesium phosphate cement, water glass and water to form slurry A, and mixing a waterproof agent and water to form slurry B;
s2: the slurry A is stirred uniformly, then the fine aggregate and the coarse aggregate are respectively added and stirred uniformly, finally the slurry B is added and stirred uniformly to obtain the cement-based crack repairing slurry.
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