An interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material and its application

Abstract

The present invention relates to the field of magnesium phosphate cement-based materials, and specifically discloses an interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material and its application. The repair material includes: 400-600 parts of magnesium phosphate cement-based material, 50-150 parts of emulsified asphalt, 5-10 parts of toughening organic component, 10-15 parts of optimizer, 8-20 parts of interface enhancer, 4-10 parts of chemically modified fiber, and 80-100 parts of mixing water. The magnesium phosphate cement-based material includes: 150-300 parts by weight of magnesium oxide powder, 70-150 parts by weight of phosphate, and 10-30 parts by weight of retarder. The present invention can not only coordinate the demulsification of emulsified asphalt and the hydration of magnesium phosphate cement, but also enhance the bonding ability between the repair material and the repair interface, and improve the mechanical properties of the repair material.

Description

Technical Field

[0001] The present invention relates to the field of magnesium phosphate cement-based materials, and particularly to an interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material and its application. Background Art

[0002] Disclosing the information of this background art section is only intended to increase the understanding of the overall background of the present invention, and it is not necessarily regarded as an admission or an implication in any form that this information constitutes the prior art already known to those of ordinary skill in the art.

[0003] Due to the advantages such as good vibration reduction and noise reduction performance and smooth and comfortable driving performance, asphalt pavement has become the first choice for highways. However, under the problems of rapidly increasing heavy traffic and high temperature sensitivity of asphalt, various pavement diseases such as cracks frequently occur, threatening driving safety. How to quickly and timely repair the damaged pavement to extend the service life of the road is a difficult problem faced by road maintenance work. Traditional hot mix asphalt repair has high energy consumption, is severely affected by climate and has high construction difficulty, while cold mix asphalt repair has deficiencies in terms of being restricted by repair materials, slow strength formation and poor water stability.

[0004] Adding cement to emulsified asphalt mixture can improve its high temperature stability and water stability. Moreover, the water demand for the hydration process of cement is relatively large, which can accelerate the demulsification of emulsified asphalt, thereby improving the adhesion between asphalt and aggregate. Among them, cement plays a good regulating role in the mixture. It can hydrate to form cement stone to strengthen the internal structure inside the mixture, and can also further improve the strength by consuming internal water through the hydration reaction. This kind of cement-emulsified asphalt mixture fills the gap in the field of cold patch materials and is widely used. However, its strength development is still slow and the early strength is low, making it difficult to meet the requirements of rapid repair.

[0005] Magnesium phosphate cement (MPC) is a new type of cementitious material. The basic principle of its setting and hardening is that phosphate ions react rapidly with dead-burned magnesia in an acidic environment to form dense crystals, having performance advantages such as rapid hardening and early strength, excellent bonding performance, good durability and excellent weather resistance. However, the present invention finds that when directly compounding MPC and emulsified asphalt, there are problems that the hydration of MPC and the demulsification of emulsified asphalt are difficult to coordinate, which in turn leads to the deterioration of the strength of the composite material, and there is an interface weak zone between the composite material and the repair interface. Summary of the Invention

[0006] In view of the above problems, the present invention provides an interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material and its application, which can not only coordinate the demulsification of emulsified asphalt and the hydration of magnesium phosphate cement, but also enhance the bonding ability between the repair material and the repair interface, and improve the mechanical properties of the repair material. Specifically, the technical solution of the present invention is as follows.

[0007] First of all, the present invention provides an interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material, which comprises the following components in parts by weight: 400-600 parts of magnesium phosphate cement-based material, 50-150 parts of emulsified asphalt, 5-10 parts of toughening organic component, 10-15 parts of optimizer, 8-20 parts of interface enhancer, 4-10 parts of chemically modified fiber, and 80-100 parts of mixing water.

[0008] Furthermore, the magnesium phosphate cement-based material comprises: 150-300 parts by weight of magnesium oxide powder, 70-150 parts by weight of phosphate, and 10-30 parts by weight of retarder. Optionally, the phosphate comprises at least one of potassium dihydrogen phosphate, sodium dihydrogen phosphate, ammonium dihydrogen phosphate, etc. The retarder comprises at least one of borax, boric acid, triethanolamine, etc.

[0009] Furthermore, the solid content of the emulsified asphalt is 50-60%.

[0010] Furthermore, the toughening organic component comprises at least one of waste tire powder, polyethylene rubber powder, polyurethane rubber powder, styrene-butadiene-styrene rubber powder (SBS), polypropylene fiber powder, cellulose ether powder, ethylene-vinyl acetate copolymer rubber powder, etc. Optionally, the fineness of the toughening organic component is 200-400 mesh.

[0011] Furthermore, the optimizer comprises at least one of thiobenzenesulfonic acid, sulfanilic acid diethylenetriamine, cyclohexyl phenyl ester, 2-ethylhexyl terephthalate, diisooctyl phthalate, octadecyl sulfobetaine, sodium p-toluenesulfonate, cetyl dimethyl benzyl ammonium chloride, etc. The optimizer can effectively overcome and improve the synergy of emulsified asphalt and magnesium phosphate cement.

[0012] Furthermore, the interface enhancer is formed by mixing epoxy resin, polyamide, phthalic anhydride, rubber powder, and N,N-dimethylaniline in a mass ratio of 8-15:0.3-0.5:0.1-0.3:0.5-1:0.1-0.2. Optionally, the polyamide comprises any one of polyhexamethylene adipamide, poly(p-phenylene terephthalamide), polycaprolactam, etc. The interface enhancer can effectively eliminate the interfacial transition zone and strengthen the bonding ability between the repair material and the repair interface.

[0013] Furthermore, the preparation method of the chemically modified fiber includes: placing basalt fiber in an alkali solution and standing it for surface treatment. After completion, the basalt fiber is separated, washed, and then placed in a modifier for heat preservation treatment. After completion, the fiber is washed and dried to obtain the chemically modified fiber. The modifier includes at least one of trichlorofluorosilane, 3-aminopropyltriethoxysilane, aminophenylsilane, styrene, acrylic acid, etc.

[0014] Furthermore, the ratio of the basalt fiber to the alkali solution is 1 g: 20 - 40 ml. Optionally, the mass fraction of the alkali solution is 1 - 5%. The alkali solution includes any one of sodium hydroxide solution, potassium hydroxide solution, ammonia water, etc.

[0015] Furthermore, the length of the basalt fiber is 5 - 30 mm.

[0016] Furthermore, the standing time is 2 - 6 h. After treatment with the alkali solution, the surface reaction activity of the basalt fiber can be effectively improved to react with the active groups in the modifier.

[0017] Furthermore, the heating temperature is 50 - 80 °C, and the heat preservation time is 2 - 6 hours. During this process, the basalt fiber can be completely immersed in the modifier.

[0018] Furthermore, the drying temperature is 60 - 80 °C, and the drying time is 20 - 24 hours.

[0019] Furthermore, the repair material also includes admixtures, such as 3 - 7 parts by weight of water reducing agent and 1 - 4 parts by weight of defoaming agent. Optionally, the water reducing agent includes at least one of naphthalene - based water reducing agent, polycarboxylate water reducing agent, lignin water reducing agent, etc. The defoaming agent includes at least one of silicone defoaming agent, fatty acid defoaming agent, polyether defoaming agent, etc.

[0020] Secondly, the present invention provides the application of the interface - enhanced emulsified asphalt composite magnesium phosphate cement repair material in the fields of building engineering, road engineering, bridge engineering, water conservancy and hydropower engineering, ocean engineering, etc.

[0021] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0022] When the present invention composes magnesium phosphate cement and emulsified asphalt, it also adds components such as an optimizer, an interface enhancer, and a chemically modified fiber. It not only breaks the compatibility barrier between the organic matter and inorganic matter of emulsified asphalt and magnesium phosphate cement, promotes better fusion of the two, but also enhances the bonding ability between the repair material and the repair interface, and improves the mechanical properties of the repair material.

[0023] (1) The present invention utilizes the molecular characteristics of nitrobenzenesulfonic acid and thiobenzenesulfonic acid in the optimizing agent, which have nitro and sulfonic acid groups, to regulate the hydration reaction rate of magnesium phosphate cement, ensuring a longer working time and increasing construction convenience. At the same time, the sulfonic acid group has the effect of better dispersing the magnesium phosphate cement slurry and reducing the aggregation of particles in the liquid, thereby avoiding the formation of large-scale weak areas that damage the strength of the repair material. In addition, the thiobenzenesulfonic acid can also form a coordination compound with magnesium ions in the magnesium phosphate cement, enhancing the water resistance and corrosion resistance of the cement, and forming an emulsified asphalt composite magnesium phosphate cement repair material with strong workability and good durability. Sulfanilic acid diethylenetriamine, octadecyl sulfobetaine, cetyl dimethyl benzyl ammonium chloride, and sodium p-toluenesulfonate in the optimizing agent can assist the uniform distribution of the hydration products of magnesium phosphate cement and asphalt colloidal particles in the repair material system by reducing the surface tension of the solution, improving the fluidity and water resistance of the repair material, so as to facilitate the formation of an interlaced network structure between the hydration products and the emulsified asphalt, improving the strength and weather resistance of the repair material and enabling it to have the ability to be constructed in multiple scenarios. Cyclohexyl phenyl ester in the optimizing agent can not only improve the fluidity and workability of the repair material of the present invention, but also the benzene ring part and cyclohexyl part of the cyclohexyl phenyl ester can interact with the surface of cement particles, improving the wettability of the cement by binding to the surface molecules of the cement. This effect helps the uniform dispersion between cement particles, reduces the aggregation and caking between particles, and improves the uniformity of the repair material. Diisooctyl phthalate and 2-ethylhexyl terephthalate can effectively improve the toughness of the repair material of the present invention and improve the anti-cracking ability of the asphalt itself (especially in low-temperature environments), reduce cracks caused by low temperature, and delay the aging rate of the emulsified asphalt to maintain its performance for a longer time.

[0024] (2) The chemically modified fibers prepared by the present invention effectively improve the reaction activity of basalt fibers, enhance the reaction ability and dispersion ability of the contact surface between them and magnesium phosphate cement, and play a great role in improving the mechanical properties of the repair material of the present invention. This is because: the present invention uses the active groups in the modifier to react with the surface of basalt. The amino groups (-NH2) in 3-aminopropyltriethoxysilane and aminophenylsilane react with the hydroxyl group -OH or siloxane bond on the surface of basalt fibers to form a stable chemical bond. This reaction can enhance the adhesion of the amino group to the basalt fiber, helping to improve the interfacial compatibility between it and the emulsified asphalt. The fluorine element contained in trichlorofluorosilane can form a fluoride layer on the surface of basalt fibers, enhancing their hydrophobicity and improving their binding performance with asphalt. The styrene can chemically combine with the fiber surface through a free radical polymerization reaction to form a polystyrene layer, improving the mechanical properties of basalt fibers. The acrylic acid can form a covalent bond with the hydroxyl group on the surface of basalt fibers through an esterification reaction, enhancing the binding force between the fiber and organic substances such as asphalt.

[0025] (3) The interface enhancer of the present invention effectively eliminates the adverse effects brought by the interfacial transition zone between magnesium phosphate cement and emulsified asphalt in the repair material. The reasons are as follows: A large amount of heat is released during the hydration process of magnesium phosphate cement. The polyamide in the interface enhancer of the present invention provides extremely strong thermal stability and good bonding performance, which can be used to improve the adhesion of the interface enhancer, so that a cross-linked network is formed in the interfacial transition zone between the repair material and the interface to be repaired (such as road surface, airport runway, etc.), thereby improving the interfacial bonding strength. In addition, the phthalic anhydride and N,N-dimethylaniline can also chemically modify the epoxy resin. The phthalic anhydride reacts with the epoxy resin to form a cross-linked structure, thereby enhancing the strength and weather resistance of the interface enhancer, improving the stability of the interfacial bonding, and enhancing the interfacial corrosion resistance. The N,N-dimethylaniline can accelerate the curing process of the epoxy resin through a catalytic reaction, thereby increasing the hardness and bonding force of the interface enhancer. In addition, the N,N-dimethylaniline can also improve the rheological properties of the interface enhancer, making it easier to operate in practical applications. The rubber powder forms an elastic structure, which helps to improve the impact resistance of the repair material of the present invention, enhance the seismic resistance and crack resistance, and thus is beneficial to avoiding the rupture or shedding of the repair material at the interface under high stress conditions. Description of the Drawings

[0026] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings, where:

[0027] Figure 1 It is a sample diagram of the interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material prepared for Example 1 below.

[0028] Figure 2 It is a flexural strength test diagram of Example 1 below.

[0029] Figure 3 It is a compressive strength test diagram of Example 1 below.

[0030] Figure 4 It is a diagonal shear bond strength test diagram of Example 1 below. Detailed Embodiments

[0031] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. The experimental methods without specific conditions noted in the following embodiments are usually carried out under conventional conditions or according to the conditions recommended by the manufacturer.

[0032] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to persons skilled in the art. The reagents or raw materials used in the present invention can all be obtained by conventional means of purchase. Unless otherwise specified, the reagents or raw materials used in the present invention are used in accordance with the conventional methods in the art or in accordance with the product instructions. In addition, any methods and materials similar or equivalent to the recorded content can be applied to the method of the present invention.

[0033] Example 1

[0034] A preparation method of an interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material comprises the following steps:

[0035] (1) Preparation of chemically modified fibers: Basalt fibers with a length of 5 mm are mixed with a sodium hydroxide solution with a mass fraction of 3% at a ratio of 1 g: 25 ml, and then left standing for 4 hours. Then the fibers are filtered out, washed with clear water to remove the residual alkali solution, and placed in trichlorofluorosilane, and heated to 60 °C for 4 hours. After completion, the fibers are filtered and washed with clear water, and then dried at 80 °C for 20 hours to obtain chemically modified fibers, which are reserved for use.

[0036] (2) Epoxy resin, polycaprolactam, phthalic anhydride, butyl rubber powder, and N,N-dimethylaniline are mixed at a mass ratio of 11: 0.4: 0.15: 0.6: 0.13 and stirred evenly to obtain an interface enhancer, which is reserved for use.

[0037] (3) Take the following proportions of each raw material: 480 parts by weight of magnesium phosphate cement-based material, 100 parts by weight of emulsified asphalt with a solid content of 50%, 7 parts by weight of toughening organic component (waste tire powder with a fineness of 200 mesh), 12.5 parts by weight of optimizer (cetyl dimethyl benzyl ammonium chloride), 15 parts by weight of the interface enhancer prepared in this example, 6 parts by weight of the chemically modified fibers prepared in this example, and 95 parts by weight of mixing water. The magnesium phosphate cement-based material is composed of 240 parts by weight of magnesium oxide powder, 110 parts by weight of potassium dihydrogen phosphate, and 20 parts by weight of borax.

[0038] (4) The chemically modified fibers, toughening organic component, optimizer, and mixing water are mixed and stirred evenly, then the emulsified asphalt is added and stirred for 1 min, then the magnesium phosphate cement-based material is added and stirred for 4 min, and finally the interface enhancer is added and stirred evenly to obtain the emulsified asphalt composite magnesium phosphate cement repair material, as Figure 1 shown.

[0039] Performance test: (1) According to GB / T 1346-2011 "Test Method for Cement Strength (Iso-Press Method)", the 7-day flexural strength of the magnesium phosphate cement repair material prepared in this example (as Figure 2 shown), 7-day compressive strength (asFigure 3 (as shown). (2) Use a cement mortar specimen with a bottom side length of 40 mm and a height of 80 mm as the substrate, cut it (the cut angle is 30°), and then bond the section with the magnesium phosphate cement repair material prepared in this embodiment. After hardening for 72 hours, perform an inclined shear bond strength test (as Figure 4 shown). The test results of the above indicators are shown in the following table:

[0040] .

[0041] Example 2

[0042] A preparation method of an interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material, comprising the following steps:

[0043] (1) Preparation of chemically modified fibers: Mix basalt fibers with a length of 10 mm and a sodium hydroxide solution with a mass fraction of 2% in a ratio of 1 g:40 ml, and let stand for 5 hours. Then filter out the fibers, wash them with clear water to remove the residual alkali solution, and place them in 3-aminopropyltriethoxysilane, and heat to 50 °C for 6 hours. After completion, filter the fibers and wash them with clear water, and then dry them at 70 °C for 24 hours to obtain chemically modified fibers for standby.

[0044] (2) Mix epoxy resin, polyhexamethylene adipamide, phthalic anhydride, butyl rubber powder, and N,N-dimethylaniline in a mass ratio of 9:0.3:0.1:0.6:0.15 and stir evenly to obtain an interface enhancer for standby.

[0045] (3) Take the following proportions of raw materials: 520 parts by weight of magnesium phosphate cement-based material, 70 parts by weight of emulsified asphalt with a solid content of 60%, 5 parts by weight of toughening organic component (SBS powder with a fineness of 300 mesh), 11 parts by weight of optimizer (sulfanilamide diethylenetriamine), 10 parts by weight of the interface enhancer prepared in this embodiment, 4 parts by weight of the chemically modified fibers prepared in this embodiment, and 90 parts by weight of mixing water. The magnesium phosphate cement-based material is composed of 180 parts by weight of magnesium oxide powder, 100 parts by weight of ammonium dihydrogen phosphate, and 15 parts by weight of borax.

[0046] (4) Mix the chemically modified fibers, toughening organic component, optimizer, and mixing water and stir evenly, then add the emulsified asphalt and stir for 1 min, then add the magnesium phosphate cement-based material and stir for 4 min, and finally add the interface enhancer and stir evenly to obtain an emulsified asphalt composite magnesium phosphate cement repair material.

[0047] Performance test: Use the same method as in Example 1 above to test the 7-day flexural strength, 7-day compressive strength, and inclined shear bond strength of the magnesium phosphate cement repair material prepared in this embodiment. The test results are shown in the following table:

[0048] 。

[0049] Example 3

[0050] A preparation method of an interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material, comprising the following steps:

[0051] (1) Preparation of chemically modified fibers: Basalt fibers with a length of 20 mm are mixed with a sodium hydroxide solution with a mass fraction of 4% at a ratio of 1 g: 30 ml and left standing for 3.5 hours, then the fibers are filtered out, washed with clear water to remove the residual alkali solution, placed in styrene, and heated to 80 °C for 2 hours. After completion, the fibers are filtered and washed with clear water, and then dried at 60 °C for 24 hours to obtain chemically modified fibers for standby.

[0052] (2) Epoxy resin, polyhexamethylene adipamide, phthalic anhydride, butyl rubber powder, and N,N-dimethylaniline are mixed at a mass ratio of 15: 0.5: 0.2: 1.0: 0.18 and stirred evenly to obtain an interface enhancer for standby.

[0053] (3) Take the following proportions of each raw material: 400 parts by weight of magnesium phosphate cement-based material, 50 parts by weight of emulsified asphalt with a solid content of 60%, 7.5 parts by weight of toughening organic component (polyethylene rubber powder with a fineness of 250 mesh), 10 parts by weight of optimizer (2-ethylhexyl terephthalate), 8 parts by weight of the interface enhancer prepared in this example, 6 parts by weight of the chemically modified fibers prepared in this example, and 80 parts by weight of mixing water. The magnesium phosphate cement-based material is composed of 300 parts by weight of magnesium oxide powder, 150 parts by weight of potassium dihydrogen phosphate, and 30 parts by weight of triethanolamine.

[0054] (4) The chemically modified fibers, toughening organic component, optimizer, and mixing water are mixed and stirred evenly, then the emulsified asphalt is added and stirred for 1 min, then the magnesium phosphate cement-based material is added and stirred for 4 min, and finally the interface enhancer is added and stirred evenly to obtain an emulsified asphalt composite magnesium phosphate cement repair material.

[0055] Performance test: Using the same method as in Example 1 above, the 7-day flexural strength, 7-day compressive strength, and inclined shear bond strength of the magnesium phosphate cement repair material prepared in this example are tested, and the test results are shown in the following table:

[0056] 。

[0057] Example 4

[0058] A preparation method of an interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material, comprising the following steps:

[0059] (1) Preparation of chemically modified fiber: Basalt fibers with a length of 30 mm are mixed with a potassium hydroxide solution with a mass fraction of 5% at a ratio of 1 g: 20 ml, and then left standing for 6 hours. Then the fibers are filtered out, washed with clear water to remove the residual alkali solution, placed in styrene, and heated to 70 °C for 4 hours. After completion, the fibers are filtered and washed with clear water, and then dried at 70 °C for 21 hours to obtain the chemically modified fiber, which is reserved for use.

[0060] (2) Epoxy resin, polycaprolactam, phthalic anhydride, butyl rubber powder, and N,N-dimethylaniline are mixed at a mass ratio of 8: 0.35: 0.15: 0.5: 0.1 and stirred evenly to obtain the interface enhancer, which is reserved for use.

[0061] (3) Take the following proportions of each raw material: 510 parts by weight of magnesium phosphate cement-based material, 120 parts by weight of emulsified asphalt with a solid content of 55%, 10 parts by weight of toughening organic component (polypropylene fiber powder with a fineness of 400 mesh), 13 parts by weight of optimizing agent (cetyl dimethyl benzyl ammonium chloride), 16 parts by weight of the interface enhancer prepared in this example, 8 parts by weight of the chemically modified fiber prepared in this example, and 95 parts by weight of mixing water. The magnesium phosphate cement-based material is composed of 150 parts by weight of magnesium oxide powder, 70 parts by weight of potassium dihydrogen phosphate, and 10 parts by weight of boric acid.

[0062] (4) The chemically modified fiber, toughening organic component, optimizing agent, and mixing water are mixed and stirred evenly, then the emulsified asphalt is added and stirred for 1 min, then the magnesium phosphate cement-based material is added and stirred for 4 min, and finally the interface enhancer is added and stirred evenly to obtain the emulsified asphalt composite magnesium phosphate cement repair material.

[0063] Performance test: The 7-day flexural strength, 7-day compressive strength, and inclined shear bond strength of the magnesium phosphate cement repair material prepared in this example are tested by the same method as in Example 1 above, and the test results are shown in the following table:

[0064] 。

[0065] Example 5

[0066] A preparation method of an interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material, comprising the following steps:

[0067] (1) Preparation of chemically modified fiber: Basalt fibers with a length of 10 mm were mixed with a potassium hydroxide solution with a mass fraction of 1% at a ratio of 1 g: 35 ml, and then left standing for 2 hours. Then, the fibers were filtered out, washed with clean water to remove the residual alkali solution, placed in acrylic acid, and heated to 80 °C for 3 hours. After completion, the fibers were filtered and washed with clean water, and then dried at 60 °C for 24 hours to obtain the chemically modified fiber, which was reserved for use.

[0068] (2) Epoxy resin, polycaprolactam, phthalic anhydride, nitrile rubber powder, and N,N-dimethylaniline were mixed at a mass ratio of 14: 0.5: 0.18: 0.9: 0.2 and stirred evenly to obtain the interfacial toughening agent, which was reserved for use.

[0069] (3) Take the following proportions of each raw material: 600 parts by weight of magnesium phosphate cement-based material, 150 parts by weight of emulsified asphalt with a solid content of 50%, 8 parts by weight of toughening organic component (polyurethane rubber powder with a fineness of 200 mesh), 15 parts by weight of optimizing agent (thiophenylsulfonic acid), 20 parts by weight of the interfacial toughening agent prepared in this example, 10 parts by weight of the chemically modified fiber prepared in this example, and 100 parts by weight of mixing water. The magnesium phosphate cement-based material was composed of 200 parts by weight of magnesium oxide powder, 80 parts by weight of sodium dihydrogen phosphate, and 15 parts by weight of borax.

[0070] (4) The chemically modified fiber, toughening organic component, optimizing agent, and mixing water were mixed and stirred evenly, then the emulsified asphalt was added and stirred for 1 min, then the magnesium phosphate cement-based material was added and stirred for 4 min, and finally the interfacial toughening agent was added and stirred evenly to obtain the emulsified asphalt composite magnesium phosphate cement repair material.

[0071] Performance test: The 7-day flexural strength, 7-day compressive strength, and inclined shear bond strength of the magnesium phosphate cement repair material prepared in this example were tested using the same method as in Example 1 above. The test results are shown in the following table:

[0072] 。

[0073] Example 6

[0074] A preparation method of an interfacial toughening type emulsified asphalt composite magnesium phosphate cement repair material, comprising the following steps:

[0075] (1) Preparation of chemically modified fiber: Basalt fibers with a length of 20 mm were mixed with a potassium hydroxide solution with a mass fraction of 3% at a ratio of 1 g: 40 ml, and then left standing for 4 hours. Then, the fibers were filtered out, washed with clean water to remove the residual alkali solution, placed in aminophenylsilane, and heated to 80 °C for 5 hours. After completion, the fibers were filtered and washed with clean water, and then dried at 60 °C for 24 hours to obtain the chemically modified fiber, which was reserved for use.

[0076] (2) Mix epoxy resin, poly(p-phenylenediamide), phthalic anhydride, ethylene propylene diene monomer (EPDM) rubber powder, and N,N-dimethylaniline in a mass ratio of 10:0.4:0.3:0.7:0.15 and stir evenly to obtain the interface enhancer for standby.

[0077] (3) Take the following proportions of each raw material: 450 parts by weight of magnesium phosphate cement-based material, 80 parts by weight of emulsified asphalt with a solid content of 60%, 7.2 parts by weight of toughening organic component (ethylene-vinyl acetate copolymer powder with a fineness of 300 mesh), 10 parts by weight of optimizer (diisooctyl phthalate), 13 parts by weight of the interface enhancer prepared in this example, 5 parts by weight of the chemically modified fiber prepared in this example, and 85 parts by weight of mixing water. The magnesium phosphate cement-based material is composed of 300 parts by weight of magnesium oxide powder, 100 parts by weight of potassium dihydrogen phosphate, and 20 parts by weight of borax.

[0078] (4) Mix the chemically modified fiber, toughening organic component, optimizer, and mixing water evenly, then add the emulsified asphalt and stir for 1 min, then add the magnesium phosphate cement-based material and stir for 4 min, and finally add the interface enhancer and stir evenly to obtain the emulsified asphalt composite magnesium phosphate cement repair material.

[0079] Performance test: Use the same method as in Example 1 above to test the 7-day flexural strength, 7-day compressive strength, and inclined shear bond strength of the magnesium phosphate cement repair material prepared in this example. The test results are shown in the following table:

[0080] 。

[0081] Example 7

[0082] A preparation method of an interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material, comprising the following steps:

[0083] (1) Take the following proportions of each raw material: 550 parts by weight of magnesium phosphate cement-based material, 110 parts by weight of emulsified asphalt with a solid content of 60%, 8 parts by weight of toughening organic component (polyethylene powder with a fineness of 200 mesh), 13 parts by weight of optimizer (cyclohexylbenzene), 15 parts by weight of the interface enhancer prepared in Example 1, 7 parts by weight of the chemically modified fiber prepared in Example 1, 96 parts by weight of mixing water, 5 parts by weight of polycarboxylate water reducer, and 2 parts by weight of silicone defoamer. The magnesium phosphate cement-based material is composed of 160 parts by weight of magnesium oxide powder, 80 parts by weight of potassium dihydrogen phosphate, and 14 parts by weight of borax.

[0084] (2) Mix the chemically modified fiber, toughening organic component, optimizer, water reducer, defoamer and mixing water evenly, then add the emulsified asphalt and stir for 1 min, then add the magnesium phosphate cement-based material and stir for 4 min, and finally add the interface enhancer and stir evenly to obtain the emulsified asphalt composite magnesium phosphate cement repair material.

[0085] Performance test: Use the same method as in Example 1 above to test the 7-day flexural strength, 7-day compressive strength and inclined shear bond strength of the magnesium phosphate cement repair material prepared in this example. The test results are shown in the following table:

[0086] 。

[0087] Example 8

[0088] A preparation method of an interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material, comprising the following steps:

[0089] (1) Take the following proportions of raw materials: 420 parts by weight of magnesium phosphate cement-based material, 60 parts by weight of emulsified asphalt with a solid content of 55%, 9 parts by weight of toughening organic component (polyethylene rubber powder with a fineness of 400 mesh), 10 parts by weight of optimizer (octyl sulfobetaine), 10 parts by weight of the interface enhancer prepared in Example 2, 5 parts by weight of the chemically modified fiber prepared in Example 2, 82 parts by weight of mixing water, 3 parts by weight of lignosulfonate water reducer, and 1 part by weight of fatty acid defoamer. The magnesium phosphate cement-based material is composed of 200 parts by weight of magnesium oxide powder, 80 parts by weight of sodium dihydrogen phosphate, and 15 parts by weight of borax.

[0090] (2) Mix the chemically modified fiber, toughening organic component, optimizer, water reducer, defoamer and mixing water evenly, then add the emulsified asphalt and stir for 1 min, then add the magnesium phosphate cement-based material and stir for 4 min, and finally add the interface enhancer and stir evenly to obtain the emulsified asphalt composite magnesium phosphate cement repair material.

[0091] Performance test: Use the same method as in Example 1 above to test the 7-day flexural strength, 7-day compressive strength and inclined shear bond strength of the magnesium phosphate cement repair material prepared in this example. The test results are shown in the following table:

[0092] 。

[0093] Example 9

[0094] A preparation method of an interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material, comprising the following steps:

[0095] (1) Take the following proportions of each raw material: 500 parts by weight of magnesium phosphate cement-based material, 100 parts by weight of emulsified asphalt with a solid content of 55%, 8 parts by weight of toughening organic component (hydroxymethyl cellulose powder with a fineness of 200 mesh), 13 parts by weight of optimizing agent (sodium p-toluenesulfonate), 16 parts by weight of the interface enhancer prepared in Example 4, 8 parts by weight of the chemically modified fiber prepared in Example 4, 90 parts by weight of mixing water, 7 parts by weight of naphthalene-based water reducer, and 4 parts by weight of polyether defoamer. The magnesium phosphate cement-based material is composed of 300 parts by weight of magnesium oxide powder, 100 parts by weight of potassium dihydrogen phosphate, and 20 parts by weight of borax mixed together.

[0096] (2) Mix the chemically modified fiber, toughening organic component, optimizing agent, water reducer, defoamer, and mixing water and stir evenly, then add the emulsified asphalt and stir for 1 min, then add the magnesium phosphate cement-based material and stir for 4 min, and finally add the interface enhancer and stir evenly to obtain the emulsified asphalt composite magnesium phosphate cement repair material.

[0097] Performance test: Use the same method as in Example 1 above to test the 7-day flexural strength, 7-day compressive strength, and inclined shear bond strength of the magnesium phosphate cement repair material prepared in this example. The test results are shown in the following table:

[0098] 。

[0099] Example 10

[0100] A preparation method of an emulsified asphalt composite magnesium phosphate cement repair material, comprising the following steps:

[0101] (1) Take the following proportions of each raw material: 480 parts by weight of magnesium phosphate cement-based material, 100 parts by weight of emulsified asphalt with a solid content of 50%, 7 parts by weight of toughening organic component (waste tire powder with a fineness of 200 mesh), 15 parts by weight of the interface enhancer prepared in Example 1, 6 parts by weight of the chemically modified fiber prepared in Example 1, and 95 parts by weight of mixing water. The magnesium phosphate cement-based material is composed of 240 parts by weight of magnesium oxide powder, 110 parts by weight of potassium dihydrogen phosphate, and 20 parts by weight of borax mixed together.

[0102] (2) Mix the chemically modified fiber, toughening organic component, and mixing water and stir evenly, then add the emulsified asphalt and stir for 1 min, then add the magnesium phosphate cement-based material and stir for 4 min, and finally add the interface enhancer and stir evenly to obtain the emulsified asphalt composite magnesium phosphate cement repair material.

[0103] Performance test: Use the same method as in Example 1 above to test the 7-day flexural strength, 7-day compressive strength, and inclined shear bond strength of the magnesium phosphate cement repair material prepared in this example. The test results are shown in the following table:

[0104] 。

[0105] Example 11

[0106] A preparation method of an emulsified asphalt composite magnesium phosphate cement repair material includes the following steps:

[0107] (1) Take the following proportions of raw materials: 520 parts by weight of magnesium phosphate cement-based material, 70 parts by weight of emulsified asphalt with a solid content of 60%, 5 parts by weight of toughening organic component (SBS powder with a fineness of 300 mesh), 11 parts by weight of optimizer (sulfanil aniline diethylenetriamine), 4 parts by weight of the chemically modified fiber prepared in this example, and 90 parts by weight of mixing water. The magnesium phosphate cement-based material is composed of 180 parts by weight of magnesium oxide powder, 100 parts by weight of ammonium dihydrogen phosphate, and 15 parts by weight of borax.

[0108] (2) Mix the chemically modified fiber, toughening organic component, optimizer, and mixing water evenly, then add the emulsified asphalt and stir for 1 min, and then add the magnesium phosphate cement-based material and stir for 4 min to obtain the emulsified asphalt composite magnesium phosphate cement repair material.

[0109] Performance test: Use the same method as in Example 1 above to test the 7-day flexural strength, 7-day compressive strength, and inclined shear bond strength of the magnesium phosphate cement repair material prepared in this example. The test results are shown in the following table:

[0110] 。

[0111] Example 12

[0112] A preparation method of an interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material includes the following steps:

[0113] (1) Take the following proportions of raw materials: 400 parts by weight of magnesium phosphate cement-based material, 50 parts by weight of emulsified asphalt with a solid content of 60%, 7.5 parts by weight of toughening organic component (polyethylene rubber powder with a fineness of 250 mesh), 10 parts by weight of optimizer (2-ethylhexyl terephthalate), 8 parts by weight of the interface enhancer prepared in Example 3, 6 parts by weight of basalt fiber with a length of 20 mm, and 80 parts by weight of mixing water. The magnesium phosphate cement-based material is composed of 300 parts by weight of magnesium oxide powder, 150 parts by weight of potassium dihydrogen phosphate, and 30 parts by weight of triethanolamine.

[0114] (2) Mix the basalt fiber, toughening organic component, optimizing agent, and mixing water evenly, then add the emulsified asphalt and stir for 1 min, then add the magnesium phosphate cement-based material and stir for 4 min, and finally add the interface enhancer and stir evenly to obtain the emulsified asphalt composite magnesium phosphate cement repair material.

[0115] Performance test: Use the same method as in Example 1 above to test the 7-day flexural strength, 7-day compressive strength, and inclined shear bond strength of the magnesium phosphate cement repair material prepared in this example. The test results are shown in the following table:

[0116] .

[0117] Example 13

[0118] A preparation method of an emulsified asphalt composite magnesium phosphate cement repair material is the same as that in Example 4 above, except that the chemically modified fiber in this example is prepared by the following method: Mix basalt fibers with a length of 30 mm and a potassium hydroxide solution with a mass fraction of 5% at a ratio of 1 g:20 ml, and let it stand for 6 hours, then filter out the fibers, wash them with clean water to remove the residual alkali solution, and dry them at 70 °C for 21 hours to obtain the chemically modified fiber.

[0119] Performance test: Use the same method as in Example 1 above to test the 7-day flexural strength, 7-day compressive strength, and inclined shear bond strength of the magnesium phosphate cement repair material prepared in this example. The test results are shown in the following table:

[0120] .

[0121] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still repair the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any repair, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material, characterized in that, It comprises the following components in parts by weight: 400 - 600 parts of magnesium phosphate cement-based material, 50 - 150 parts of emulsified asphalt, 5 - 10 parts of toughening organic component, 10 - 15 parts of optimizer, 8 - 20 parts of interface enhancer, 4 - 10 parts of chemically modified fiber, and 80 - 100 parts of mixing water; wherein: The interface enhancer is formed by mixing epoxy resin, polyamide, phthalic anhydride, rubber powder, and N,N-dimethylaniline in a mass ratio of 8 - 15:0.3 - 0.5:0.1 - 0.3:0.5 - 1:0.1 - 0.2; The optimizer is selected from at least one of sulfanilamide diethylenetriamine, cyclohexyl phenyl ester, 2-ethylhexyl terephthalate, diisooctyl phthalate, and cetyl dimethyl benzyl ammonium chloride; The polyamide is selected from at least one of polyhexamethylene adipamide, poly(p-phenylene terephthalamide), and polycaprolactam; The preparation method of the chemically modified fiber includes: placing basalt fiber in an alkali solution and standing; after completion, separating the basalt fiber, washing it, and then placing it in a modifier for heat preservation treatment; after completion, washing and drying the fiber to obtain the chemically modified fiber; the modifier is selected from at least one of styrene and acrylic acid.

2. The interfacial enhanced emulsified asphalt composite magnesium phosphate cement repair material according to claim 1, wherein The magnesium phosphate cement-based material includes: 150 - 300 parts by weight of magnesium oxide powder, 70 - 150 parts by weight of phosphate, and 10 - 30 parts by weight of retarder.

3. The interfacial enhanced emulsified asphalt composite magnesium phosphate cement repair material according to claim 1, characterized in that, The solid content of the emulsified asphalt is 50 - 60%.

4. The interfacial enhanced emulsified asphalt composite magnesium phosphate cement repair material according to claim 1, characterized in that, The toughening organic component includes at least one of waste tire powder, polyethylene rubber powder, polyurethane rubber powder, styrene-butadiene-styrene rubber powder, polypropylene fiber powder, cellulose ether powder, and ethylene-vinyl acetate copolymer rubber powder.

5. The interfacial enhanced emulsified asphalt composite magnesium phosphate cement repair material according to claim 1, characterized in that The fineness of the toughening organic component is 200 - 400 mesh.

6. The interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material according to claim 1, wherein The ratio of the basalt fiber to the alkali solution is 1 g:20 - 40 ml.

7. The interfacial enhanced emulsified asphalt composite magnesium phosphate cement repair material according to claim 1, characterized in that, The mass fraction of the alkali solution is 1 - 5%.

8. The interfacial enhanced emulsified asphalt composite magnesium phosphate cement repair material according to claim 1, characterized in that, The alkali solution includes any one of sodium hydroxide solution, potassium hydroxide solution, and ammonia water.

9. The interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material according to claim 1, characterized in that, The length of the basalt fiber is 5 - 30 mm.

10. The interfacial enhanced emulsified asphalt composite magnesium phosphate cement repair material according to claim 1, characterized in that, The standing time is 2 - 6 h.

11. The interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material according to claim 1, wherein The heating temperature is 50 - 80 °C, and the heat preservation time is 2 - 6 hours.

12. The interfacial enhanced emulsified asphalt composite magnesium phosphate cement repair material according to claim 1, wherein, The drying temperature is 60 - 80 °C, and the drying time is 20 - 24 hours.

13. The interfacial enhanced emulsified asphalt composite magnesium phosphate cement repair material according to any one of claims 1-12, characterized in that, The repair material further includes 3 - 7 parts by weight of water reducer and 1 - 4 parts by weight of defoamer.

14. Application of the interface-enhanced emulsified asphalt composite magnesium phosphate cement repair material according to any one of claims 1 - 12 in building engineering, road engineering, bridge engineering, water conservancy and hydropower engineering, or marine engineering.

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