CN111056815B - Slow-setting high-toughness magnesium phosphate cement road rapid repair material - Google Patents
Slow-setting high-toughness magnesium phosphate cement road rapid repair material Download PDFInfo
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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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
- 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
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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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Abstract
The invention discloses a magnesium phosphate cement road rapid repairing material which is prepared by compounding phosphate base powder A, magnesium oxide base powder B and polymer emulsion C in proportion. The invention adopts the composite retarding technology to effectively prolong the operable time; the phosphorous slag powder is used as a mineral admixture, so that the hydration degree of the magnesium phosphate cement can be promoted while the retarding is performed; the multifunctional composite polymer emulsion is adopted, so that the water resistance of the magnesium phosphate cement is improved, and the toughness of the magnesium phosphate cement is improved; the improved magnesium phosphate cement can show excellent operability, service performance and stability, and the related preparation method is simple, low in cost and suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of road building materials, and particularly relates to a delayed coagulation high-toughness magnesium phosphate cement road rapid repair material.
Background
Magnesium Phosphate Cement (MPC) is usually prepared by using magnesium oxide (MgO) and phosphate as main components and compounding retarding components such as borax and the like according to a certain proportion. Compared with Portland cement, MPC has the advantages of extremely fast setting and hardening speed, small shrinkage, simple maintenance and the like, so that MPC is more suitable for the field of fast repairing of concrete projects, in particular for small-sized repairing of concrete pavements.
However, magnesium phosphate cements also have many deficiencies in road repair applications, mainly expressed in: 1) The reaction speed of the magnesium phosphate cement is high, the setting time is very short, the operable time of the mainstream magnesium phosphate cement repairing material in the current market is less than 30min, and the operable time of some products is less than 10min, so that the requirements of actual engineering are difficult to meet; 2) the main system of the existing magnesium phosphate cement is MgO-NH4H2PO4And MgO-KH2PO4Hydration products of the two systems have the problem of water immersion and dissolution, and roads are often in a water environment, so that the magnesium phosphate cement is difficult to popularize and apply in humid areas; 3) small-area thin layer repair often occurs in road engineering, and the bending strength and toughness of the magnesium phosphate cement serving as an inorganic material are difficult to meet the requirements.
Chinese patent "an ultrafast hard road patching material" (publication No. CN1415573A) discloses a method for preparing a road rapid patching material by adopting magnesium oxide, ammonium dihydrogen phosphate, fly ash and boric acid; the repair material prepared by the method has high early strength, the setting time basically meets the construction requirements, but ammonium dihydrogen phosphate easily releases irritant ammonia gas in the hydration process, pollutes the environment, easily forms pores on the surface and is not beneficial to construction flattening. Chinese patent "quick-hardening early-strength magnesium phosphate concrete and preparation method thereof" (publication No. CN101380518A) discloses a method for preparing road quick-repairing concrete by adding water into magnesium oxide, phosphate, boric acid and coarse and fine aggregates; the concrete prepared by the method has the advantages of high early strength, high strength and good volume stability, but the concrete is too fast to be solidified in specific construction, difficult to mix and stir and high in construction difficulty. Chinese patent "a magnesium phosphate cement-based composite material performance adjusting additive" (publication No. CN 105330197B) discloses an additive for adjusting magnesium phosphate cement performance, wherein chloride salt is used as a setting adjusting component, but from the disclosed examples, although the initial setting time is prolonged, the maximum time is only 15min, and the operation time is still insufficient as a repairing material; in addition, steel fibers are often added into the road patching material for toughening, and the addition of a large amount of chlorine can corrode the steel fibers which are often used in the road patching material, so that the performance is reduced and the internal structure is degraded.
Disclosure of Invention
The invention mainly aims to provide a magnesium phosphate cement road rapid repairing material aiming at the defects of the prior art; the compound retarding technology is adopted to effectively prolong the operable time; the phosphorous slag powder is used as a mineral admixture, so that the hydration degree of the magnesium phosphate cement can be promoted while the retarding is performed; the multifunctional composite polymer emulsion is adopted, so that the water resistance of the magnesium phosphate cement is improved, and the toughness of the magnesium phosphate cement is improved; the improved magnesium phosphate cement can show excellent operability, service performance and stability.
In order to achieve the purpose, the invention adopts the technical scheme that:
a slow setting high toughness magnesium phosphate cement road rapid patching material is prepared by proportionally compounding phosphate-based powder A, magnesium oxide-based powder B and polymer emulsion C, wherein the phosphate-based powder A comprises phosphate, borax, steel fiber and water reducing slow setting components, and the magnesium oxide-based powder comprises magnesium oxide, superfine phosphorus slag powder, fly ash microbeads and an expanding agent; polymer emulsion C includes modified silicone emulsion and EVA emulsion.
In the scheme, the mass ratio of the phosphate-based powder A to the magnesia-based powder B to the polymer emulsion C is 1 (4-5) to 0.01-0.05.
In the above scheme, the phosphate-based powder material A comprises the following components in percentage by mass: 75-87% of phosphate, 3-5% of borax, 5-10% of steel fiber and 5-10% of water reducing and retarding component; the magnesium oxide-based powder B comprises the following components in percentage by mass: 60-80% of magnesium oxide, 10-20% of superfine phosphorous slag powder, 5-10% of fly ash micro-beads and 5-10% of expanding agent; the polymer emulsion C comprises the following components in percentage by weight: 40-60% of modified organic silicon emulsion and 40-60% of EVA emulsion.
In the scheme, the phosphate is monopotassium phosphate, and the mass purity is higher than 95%.
In the scheme, the borax is sodium borate pentahydrate, and the mass purity is more than 50%.
In the scheme, the steel fiber is copper-plated micro steel fiber, and the tensile strength is more than or equal to 600 Mpa.
In the scheme, the water-reducing and set-retarding component is waste molasses which is leftover of a sugar refinery.
The above methodIn the scheme, the magnesium oxide is dead burned magnesium oxide which is prepared by calcining and grinding magnesite at 1700 ℃ with the purity of more than 90 percent and the specific surface area of 300-350m2/kg。
In the scheme, the superfine phosphorus slag powder is prepared by grinding industrial waste slag generated by preparing yellow phosphorus by an electric furnace, and P is P2O5The content is not less than 3wt%, the content of soluble fluoride is not less than 2wt%, and the specific surface area after grinding is controlled to be 500-600m2/kg。
In the scheme, the average particle size of the fly ash micro-beads is less than 0.5 mu m, and the specific surface area is more than 1000m2Kg, and ultrafine fly ash prepared by a pulverizing technique cannot be used.
In the scheme, the expanding agent is free calcium oxide or sulphoaluminate composite expanding agent.
In the above scheme, the modified silicone emulsion is a modified silane emulsion.
In the scheme, the solid content of the EVA emulsion is more than 50%.
The preparation method of the delayed coagulation high-toughness magnesium phosphate cement rapid repair material in the scheme comprises the following steps:
1) weighing and preparing phosphate-based powder A, magnesia-based powder B and polymer emulsion C in proportion; wherein the material A comprises the following components in percentage by mass: 75-90% of phosphate, 3-5% of borax, 5-10% of steel fiber and 5-10% of water reducing and retarding component; the material B comprises the following components in percentage by mass: 60-80% of magnesium oxide, 10-20% of superfine phosphorous slag powder, 5-10% of fly ash micro-beads and 5-10% of expanding agent; the emulsion C comprises the following components in percentage by weight: 40-60% of modified organic silicon emulsion and 40-60% of EVA emulsion; respectively and uniformly mixing the components in the material A and the material B, drying for later use, and mixing and uniformly stirring the two emulsions in proportion;
2) weighing the material A, the material B and the emulsion C according to the mass ratio of 1 (4-5) to 0.01-0.05, putting the material B and water into a stirrer according to the water-cement ratio of 0.25-0.35, adding the emulsion C, stirring and mixing uniformly, adding the material A, continuously stirring and mixing uniformly, and obtaining the retarded high-toughness magnesium phosphate cement rapid repairing material.
The slow-setting high-toughness magnesium phosphate cement rapid repair material obtained according to the scheme has the following properties: the initial setting time is prolonged to 40-60 min; the compressive strength reaches more than 25MPa in 2 hours, more than 40MPa in 1d and more than 60MPa in 28 d; the strength retention rate of the test piece is more than 90 percent after the test piece is soaked in water for 28 days, and the breaking energy is more than 100N/m.
The principle of the invention is as follows:
1) at present, it is generally considered that the MPC cement hydration process does not directly form magnesium phosphate set cement, but firstly generates Mg (H)2O)6 2+"hydrated Sol", with PO4 3-Reacting to form hydration products and gel, and carrying out saturated crystallization on the gel to form magnesium phosphate cement; the invention adopts the honey water-reducing and slow-setting component to effectively inhibit Mg (H)2O)6 2+Forming 'hydrated sol', and cooperating with borax to influence the crystallization generation process of a hydration product; the composite use of the two will generate a superposition effect, and the initial setting time of the obtained magnesium phosphate cement is obviously prolonged.
2) The invention fully utilizes the F and F with a large amount of solubility by mixing the ground phosphorus slag powder-Ca dissolved out from ions and admixtures2+Reaction to CaF2Poorly soluble CaF due to hydrogen bonding2Is easily adsorbed to Mg (H)2O)6 2+Surface of "hydrated sol" to inhibit it from reacting with PO4 3-Thereby reducing the hydration rate of the magnesium phosphate at an early stage; the phosphorous slag powder adopted by the invention contains more than 2% of soluble fluoride, and the grinding fineness is high, thus being beneficial to the dissolution of the fluoride and effectively playing the retarding role; in addition, the phosphorous slag powder adopted by the invention has high phosphorous content and large specific surface area, can continuously react with MgO, so that the hydration degree is improved, and the water resistance is improved from the composition of cement stones (the water resistance of a hydration product in magnesium phosphate cement is related to the completion degree of the hydration product);
3) the common water reducing agent material in the portland cement is difficult to play a role in the magnesium phosphate cement, and the invention adds the water reducing agent material with the specific surface area of more than 1000m2/kg of ultrafine fly ash microspheres, usingThe ball effect and the dispersion effect can further remarkably improve the fluidity and the operability of the magnesium phosphate cement;
4) the modified organic silicon emulsion adopted by the invention can greatly improve the structural thickness of the waterproof layer and improve the water resistance of the magnesium phosphate cement; in addition, the adopted phosphorus slag powder, fly ash microbeads and the like can form ideal particle size distribution, have obvious dense accumulation and filling effects, and greatly improve the compactness of the set cement, thereby further improving the water resistance and other durability;
5) the invention adopts the composite toughening method of the EVA emulsion and the steel fiber to improve the fracture energy of the magnesium phosphate cement repairing material.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention adopts the composite retarding technology of boric acid and waste molasses and combines the retarding effect of phosphorus slag powder, so that the initial setting time of the magnesium phosphate cement is obviously prolonged, and the operable time of the repairing material is effectively ensured.
2) According to the invention, the modified organosilicon emulsion is adopted, and a particle grading system formed by filling micropores with ultrafine fly ash and phosphorus slag powder, fly ash microbeads and the like is combined, so that the obtained hydration product has stronger water resistance;
3) the fracture energy of the magnesium phosphate cement repairing material is improved by adopting a method of compounding and toughening EVA emulsion and steel fiber;
4) the invention adds a large amount of waste residues and other industrial byproducts, has the characteristic of environmental protection and reduces the cost.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following examples, all reagents used were commercially available chemical reagents unless otherwise specified. The phosphorus slag is derived from Guizhou Kaiyang phosphate ore, wherein P2O5Content of 3.68 wt%, soluble fluoride content of 2.32 wt%, obtainedThe specific surface area of the superfine phosphorus slag powder is 550m2Per kg; the fly ash micro-beads are purchased from Lingshou county of Hebei province, and the specific surface area is 1100m2Per kg; the expansion agent UEA-WD is provided by three-source specialty materials, Inc.; the steel fiber is copper-plated micro steel fiber provided by Wuhan new-path engineering material company Limited; the borax is commercially available industrial pure borax; the modified silicone emulsion FLW99 is provided by Hai Rui waterproof materials, Inc.; EVA emulsions are available from American air chemical company; the water reducing and retarding component is waste molasses which is leftover bits and pieces of sugar refinery; the magnesia is dead-burned magnesia which is prepared by calcining and grinding magnesite at 1600-1700 ℃, the purity of the magnesia is 95.3 percent, and the specific surface area is 450m2/kg。
Example 1
The slow-setting high-toughness magnesium phosphate cement road rapid repairing material comprises the following steps:
1) preparing phosphate-based powder A, magnesia-based powder B and polymer emulsion C; the material A comprises the following components in percentage by mass: 80% of monopotassium phosphate, 4% of borax, 10% of steel fiber and 6% of water reducing and retarding component; the material B comprises the following components in percentage by mass: 75% of dead burned magnesium oxide, 10% of superfine phosphorous slag powder, 10% of fly ash micro-beads and 5% of expanding agent; the emulsion C comprises the following components in percentage by weight: 50% of modified organic silicon emulsion and 50% of EVA emulsion; respectively and uniformly mixing the components in the material A and the material B, drying for later use, and mixing and uniformly stirring the two emulsions in proportion;
2) weighing the material A, the material B and the emulsion C according to the mass ratio of 1:4:0.04, putting the material B and water in a stirrer according to the water-cement ratio of 0.3, adding the emulsion C, stirring for 1-2min, uniformly mixing, adding the material A, continuously stirring for 1-2min, and uniformly mixing to obtain the retarded high-toughness magnesium phosphate cement rapid repairing material.
The performance test results of the rapid repair material obtained in this example are as follows: initial expansion of 202 mm; initial setting time 37 minutes; the 2h compressive strength is 27.8Mpa, the 1d compressive strength is 43.1Mpa, and the 28d compressive strength is 65.2 Mpa; the strength retention rate of the alloy after being soaked in water for 28 days is 92.4 percent, and the breaking energy is 107.4N/m.
Example 2
The slow-setting high-toughness magnesium phosphate cement road rapid repairing material comprises the following steps:
1) preparing phosphate-based powder A, magnesia-based powder B and polymer emulsion C; the material A comprises the following components in percentage by mass: 78% of monopotassium phosphate, 4% of borax, 10% of steel fiber and 8% of a water reducing and retarding component; the material B comprises the following components in percentage by mass: 70% of dead burned magnesium oxide, 15% of superfine phosphorous slag powder, 10% of fly ash micro-beads and 5% of expanding agent; the emulsion C comprises the following components in percentage by weight: 50% of modified organic silicon emulsion and 50% of EVA emulsion; respectively and uniformly mixing the components in the material A and the material B, drying for later use, and mixing and uniformly stirring the two emulsions in proportion;
2) weighing the material A, the material B and the emulsion C according to the mass ratio of 1:4:0.05, putting the material B and water in a stirrer according to the water-to-adhesive ratio of 0.3, adding the emulsion C, stirring for 1-2min, uniformly mixing, adding the material A, continuously stirring for 1-2min, and uniformly mixing to obtain the retarded high-toughness magnesium phosphate cement rapid repairing material.
The performance test results of the rapid repair material obtained in this example are as follows: initial spread 214 mm; initial setting time 41 minutes; the 2h compressive strength is 26.4Mpa, the 1d compressive strength is 44.3Mpa, and the 28d compressive strength is 67.1 Mpa; the strength retention rate of the alloy after being soaked in water for 28 days is 93.8 percent, and the breaking energy is 113.7N/m.
Example 3
The slow-setting high-toughness magnesium phosphate cement road rapid repairing material comprises the following steps:
1) preparing phosphate-based powder A, magnesia-based powder B and polymer emulsion C; the material A comprises the following components in percentage by mass: 78% of monopotassium phosphate, 4% of borax, 10% of steel fiber and 8% of a water reducing and retarding component; the material B comprises the following components in percentage by mass: 65% of dead burned magnesium oxide, 20% of superfine phosphorous slag powder, 10% of fly ash micro-beads and 5% of expanding agent; the emulsion C comprises the following components in percentage by weight: 50% of modified organic silicon emulsion and 50% of EVA emulsion; respectively and uniformly mixing the components in the material A and the material B, drying for later use, and mixing and uniformly stirring the two emulsions in proportion;
2) weighing the material A, the material B and the emulsion C according to the mass ratio of 1:4:0.04, putting the material B and water in a stirrer according to the water-cement ratio of 0.3, adding the emulsion C, stirring for 1-2min, uniformly mixing, adding the material A, continuously stirring for 1-2min, and uniformly mixing to obtain the retarded high-toughness magnesium phosphate cement rapid repairing material.
Comparative example 1
Magnesium phosphate cement produced by Guizhou phosphorus magnesium material Co., Ltd is adopted, and 5% of borax is added; the mass of the magnesium phosphate cement in the mixture ratio is equal to the sum of the mass of the magnesium phosphate cement and the mass of the admixture in the embodiment.
The prepared rapid repairing material is subjected to performance test, and the result is as follows: initial extension 164 mm; initial setting time is 18 minutes; the 2h compressive strength is 28.0Mpa, the 1d compressive strength is 41.8Mpa, and the 28d compressive strength is 51.2 Mpa; the strength retention rate of the steel plate after being soaked in water for 28 days is 72.4 percent, and the breaking energy is 67.4N/m.
Comparative example 2
Magnesium phosphate cement produced by Guizhou phosphorus magnesium material Co., Ltd is doped with 5 wt% of borax and 1% of steel fiber by volume; the mass of the magnesium phosphate cement in the mixture ratio is equal to the sum of the mass of the magnesium phosphate cement and the mass of the admixture in the embodiment.
The prepared rapid repairing material is subjected to performance test, and the result is as follows: initial extension of 130 mm; initial setting time is 18 minutes; the 2h compressive strength is 28.5Mpa, the 1d compressive strength is 41.3Mpa, and the 28d compressive strength is 50.9 Mpa; the strength retention rate of the steel plate after being soaked in water for 28 days is 72.2 percent, and the breaking energy is 83.2N/m.
Comparative example 3
The magnesium phosphate cement produced by Guizhou phosphorus magnesium material Co., Ltd is doped with 5 wt% of borax and 20 wt% of fly ash; the mass sum of the magnesium phosphate cement and the fly ash in the mixture ratio is equal to the sum of the mass of the magnesium phosphate cement and the mass of the admixture in the embodiment.
The prepared rapid repairing material is subjected to performance test, and the result is as follows: initial extension 172 mm; initial setting time 19 minutes; the 2h compressive strength is 25.3.0Mpa, the 1d compressive strength is 39.6Mpa, and the 28d compressive strength is 53.8 Mpa; the strength retention rate of the product after being soaked in water for 28 days is 81.9 percent, and the breaking energy is 68.1N/m.
The above results show that: compared with magnesium phosphate cement directly doped with borax, the magnesium phosphate cement provided by the invention has the advantages that the initial expansion degree is remarkably improved, the initial setting time is remarkably prolonged, the initial setting time is more than 35min, and the construction performance is better; the 2h compressive strength is slightly reduced compared with the comparative example, but still higher than 25MPa, the requirement of quick repair is met, in the aspect of 1 day strength, the examples are all higher than the comparative example, and the 20 day strength is higher than 60MPa, so that the remarkable increase is achieved, while the comparative example only increases by 20%; and compared with the conventional singly-doped steel fiber toughened and doped fly ash improved soaking strength retention rate, the fracture energy and the soaking strength retention rate of the magnesium phosphate cement are obviously increased.
It is apparent that the above embodiments are only examples for clearly illustrating and do not limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are therefore intended to be included within the scope of the invention as claimed.
Claims (5)
1. The slow-setting high-toughness magnesium phosphate cement road rapid repair material is characterized by being prepared by compounding phosphate-based powder A, magnesium oxide-based powder B and polymer emulsion C in proportion, wherein the phosphate-based powder A comprises phosphate, borax, steel fibers and water-reducing slow-setting components, and the magnesium oxide-based powder comprises magnesium oxide, superfine phosphorus slag powder, fly ash microbeads and an expanding agent; the polymer emulsion C comprises modified organic silicon emulsion and EVA emulsion;
the mass ratio of the phosphate-based powder A to the magnesia-based powder B to the polymer emulsion C is 1 (4-5) to 0.01-0.05;
the water reducing and retarding component is waste molasses which is leftover bits and pieces of sugar refinery;
the superfine phosphorus slag powder is prepared by grinding industrial waste slag generated by preparing yellow phosphorus by an electric furnace, wherein P is P2O5The content is not less than 3wt%, the content of soluble fluoride is not less than 2wt%, and the specific surface area after grinding is controlled to be 500-600m2/kg；
The phosphate-based powder A comprises the following components in percentage by mass: 75-87% of phosphate, 3-5% of borax, 5-10% of steel fiber and 5-10% of water reducing and retarding component; the magnesium oxide-based powder B comprises the following components in percentage by mass: 60-80% of magnesium oxide, 10-20% of superfine phosphorous slag powder, 5-10% of fly ash micro-beads and 5-10% of expanding agent; the polymer emulsion C comprises the following components in percentage by weight: 40-60% of modified organic silicon emulsion and 40-60% of EVA emulsion;
the average grain diameter of the fly ash micro-beads is less than 0.5 mu m, and the specific surface area is more than 1000m2/kg。
2. The slow-setting high-toughness magnesium phosphate cement road rapid repair material according to claim 1, characterized in that the expanding agent is free calcium oxide or sulphoaluminate composite expanding agent.
3. The slow-setting high-toughness magnesium phosphate cement road rapid repair material according to claim 1, wherein the modified silicone emulsion is a modified silane emulsion.
4. The slow-setting high-toughness magnesium phosphate cement road rapid repair material according to claim 1, characterized in that the EVA emulsion has a solid content of more than 50%.
5. The preparation method of the delayed coagulation high-toughness magnesium phosphate cement rapid repair material according to any one of claims 1 to 4, which is characterized by comprising the following steps:
1) weighing and preparing phosphate-based powder A, magnesia-based powder B and polymer emulsion C in proportion; wherein the material A comprises the following components in percentage by mass: 75-90% of phosphate, 3-5% of borax, 5-10% of steel fiber and 5-10% of water reducing and retarding component; the material B comprises the following components in percentage by mass: 60-80% of magnesium oxide, 10-20% of superfine phosphorous slag powder, 5-10% of fly ash micro-beads and 5-10% of expanding agent; the polymer emulsion C comprises the following components in percentage by weight: 40-60% of modified organic silicon emulsion and 40-60% of EVA emulsion; respectively and uniformly mixing the components in the material A and the material B, drying for later use, and mixing and uniformly stirring the two emulsions in proportion;
2) weighing the powder A, the powder B and the polymer emulsion C according to the mass ratio of 1 (4-5) to (0.01-0.05), firstly putting the powder B and water into a stirrer according to the water-glue ratio of 0.25-0.35, then adding the polymer emulsion C, stirring and mixing uniformly, then adding the powder A, continuously stirring and mixing uniformly, and obtaining the retarded high-toughness magnesium phosphate cement rapid repairing material.
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