CN117125955A - Quick hardening early strength material applied to emulsified asphalt slurry seal layer and preparation method thereof - Google Patents

Abstract

The invention relates to a quick-hardening and early-strength material applied to emulsified asphalt slurry sealing layer and a preparation method, and belongs to the field of pavement maintenance composite materials. In view of the shortcomings of the existing technology, the present invention provides a slurry sealing material that can quickly open to traffic. It is prepared from magnesium phosphate cement matrix powder, emulsified asphalt, mixing water, machine-made sand, coarse aggregate and anti-dispersion agent. , possessing the rapid hardening and early strength characteristics of MPC and the flexibility of emulsified asphalt materials. This kind of material can be used with simple mixing. It also has the characteristics of high early strength, short setting time and excellent high temperature resistance, which is helpful to shorten the curing time and improve the high temperature resistance of the curing area.

Description

A fast-hardening and early-strength material applied to emulsified asphalt slurry sealing layer and its preparation method

Technical field

The invention belongs to the technical field of pavement maintenance composite materials, and specifically relates to a quick-hardening and early-strength material used in emulsified asphalt slurry sealing layer and a preparation method thereof.

Background technique

The information in this Background section is disclosed solely for the purpose of increasing understanding of the general background of the invention and is not necessarily considered to be an admission or in any way implying that the information constitutes prior art that is already known to a person of ordinary skill in the art.

Asphalt pavement is increasingly used on higher-grade highways. Its unique viscoelasticity makes it more sensitive to temperature changes: when the temperature is high in summer, it exhibits a fluid state, low strength, and low elastic modulus, and is prone to rutting. Deformation and other diseases; under low temperature conditions in winter, the elastic modulus of asphalt pavement increases and becomes a rigid material, which is prone to brittle shrinkage cracks and other diseases; in seasons with heavy rainfall, asphalt pavement is also susceptible to water damage, resulting in loose and peeling aggregates. and other phenomena, and then form pits. To make matters worse, asphalt pavement will be subject to repeated vehicle loads for a long time and is also subject to water temperature coupling, making various diseases more frequent and serious. The slurry sealing process is a preventive maintenance construction method for surface treatment of pavement. Old asphalt pavements often have cracks and potholes. When the surface is worn, emulsified asphalt slurry sealing mixture is spread on the pavement into a thin layer and allowed to solidify as quickly as possible, so that the asphalt concrete pavement can be maintained. The thickness of the slurry sealing layer is generally less than 3cm. It is maintenance and repair with the purpose of restoring the function of the road surface and preventing further damage, so as to effectively extend the service life of the highway pavement and reduce the cost of repair.

When laying slurry seals on highways or urban express lanes, high-quality emulsified asphalt or polymer-modified emulsified asphalt should be used to increase the bonding strength between asphalt and mineral materials. It is required that the emulsified asphalt does not segregate after mixing with the mineral materials and during the mixing process, has good adhesion to the mineral materials, is in a good flow state, and can quickly solidify after paving to open traffic. The commonly used emulsified asphalt slurry takes more than 4-5 hours to form after paving, which seriously hinders the opening time for traffic, causing traffic jams and threatening driving safety.

Chemically bound magnesium phosphate cementing material (MPC) is produced by magnesium oxide, soluble phosphate, admixtures and mineral admixtures in a certain proportion under acidic conditions through acid-base chemical reactions and physical effects, with phosphate as the binding phase. The new inorganic cementitious material has the characteristics of high early strength, fast setting time and excellent bonding performance. In the inventor's previous research, emulsified asphalt was combined with MPC materials. The composite material has both the rigidity of inorganic materials and the flexibility of organic materials, providing an environmentally friendly and easy-to-operate joint filling material that can effectively shorten roads. Disease repair time. However, the application methods of slurry seal and grouting materials are significantly different, and the performance requirements for composite materials are also significantly different. Direct conversion cannot meet the construction requirements. Therefore, a composite material suitable for slurry seal is provided. It has important research significance.

Contents of the invention

In view of the above technical problems, the present invention provides a slurry seal composite material suitable for asphalt pavement maintenance. This material has the characteristics of rapid hardening and early strength. It has high early strength and short setting time after paving, which is beneficial to shortening pavement maintenance. Construction time of the job.

The technical idea of the present invention is as follows:

A first aspect of the present invention provides a fast-hardening early-strength material applied to emulsified asphalt slurry sealing layer, including the following raw materials in parts by weight: magnesium phosphate cement matrix powder, emulsified asphalt, mixing water, machine-made sand, coarse Aggregates and anti-dispersion agents;

Wherein, the magnesium phosphate cement matrix powder is prepared from dead burned magnesium oxide, borax, ammonium dihydrogen phosphate, mineral powder, silica fume, and fly ash;

The anti-dispersion agent includes cellulose ether, nano-SiO ₂ and ultra-fine fly ash.

In practical applications, traditional slurry sealing materials have the disadvantages of poor strength, long strength formation time and insufficient bonding performance, making it difficult to truly achieve the purpose of road maintenance. In the present invention, magnesium phosphate cement matrix material (MPC) is added to emulsified asphalt to form an organic-inorganic composite system. The water in the emulsified asphalt can be consumed through the hydration of magnesium phosphate cement, and the hydration heat released by cement hydration can also accelerate emulsification. The demulsification speed of asphalt. After the emulsified asphalt undergoes the demulsification process, it can restore its original bonding properties and interact with the MPC material to form a semi-rigid gel between the MPC material and the emulsified asphalt. The material uses the mechanical interlocking effect of the MPC-emulsified asphalt system and the interlocking effect between the mixture to jointly form strength and complete rapid operations.

Further, the emulsified asphalt is added according to 40% to 70% of the total mass of MPC, and the total water-cement ratio W/C=0.15-0.45 is adjusted. If the amount of emulsified asphalt is too small, the MPC material cannot be completely wrapped and segregation occurs, which affects the uniformity of the material. If the amount of emulsified asphalt is too much, the mechanical properties and setting time of the material will be greatly reduced, and the material will lose its own performance. Advantages. After reviewing relevant literature and experimental tests, it was found that when the emulsified asphalt content is between 40% and 70%, the material performance advantages are obvious.

Among the anti-dispersants, the cellulose ether is hydroxypropyl methylcellulose, which can play a variety of roles in cement-based material systems, including water retention and dispersion, thickening and viscosity, air entrainment lubrication and retardation. Preliminary research results show that when the dosage of cellulose ether is greater than 0.15%, it will significantly increase the consistency of the material system and reduce the mechanical properties of the material. The low dosage of cellulose ether can well disperse the particles in the suspension and improve the stability of the material. Preliminary research shows that the mass percentage of cellulose ether in the anti-dispersion agent in the matrix material is 0.05%-0.5%, which is more reasonable; nano-SiO ₂ has been proven to improve the suspension stability, bonding strength, weather resistance, etc. of cement-based materials. , Preliminary research shows that when the dosage is too high, it will have adverse effects on mechanical properties. The dosage of nanomaterials in the anti-dispersion agent is 1% to 3%; ultrafine fly ash is an ultrafine powder, and a small amount Adding can improve the stability of the material and prevent magnesium oxide from precipitating due to gravity when the ratio of magnesium to phosphorus is small, resulting in uneven material. At the same time, a certain amount of fly ash can also improve the structural density of the material and enhance the flow of the material. Performance and mechanical properties, the recommended dosage is no more than 20% of the magnesium phosphate cement matrix powder.

The present invention also provides a method for preparing the above-mentioned fast-hardening and early-strength materials. MPC dry material and anti-dispersion agent are added to the liquid and mixed, and then coarse aggregates, etc. are added. After mixing, the materials are spread on the road to form an asphalt sealing layer, and after coating , demulsification, water separation, evaporation and solidification processes are firmly combined with the original road surface to form a dense, strong, wear-resistant and road surface seal, which greatly improves the performance of the road surface.

The beneficial effects of one or more of the above technical solutions are:

1. The setting time of the slurry seal provided by the present invention is significantly shorter than that of existing asphalt pavement repair materials. The hardening time is controlled within 2 hours, effectively shortening the road maintenance construction, opening up to traffic quickly, and developing rapid early strength. .

2. The raw materials for preparing the slurry sealing material provided by the present invention are all green and environmentally friendly raw materials, which avoids pollution to the environment and groundwater, and realizes green repair.

Detailed ways

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It should be noted that the terms used herein are for the purpose of describing specific embodiments only, and are not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular forms are also intended to include the plural forms unless the context clearly indicates otherwise. Furthermore, it will be understood that when the terms "comprises" and/or "includes" are used in this specification, they indicate There are features, steps, operations, means, components and/or combinations thereof.

As introduced in the background art, the existing materials for asphalt pavement maintenance still have the disadvantage of long construction time. In order to solve the above technical problems, the present invention proposes a quick-hardening early-stage sealant for emulsified asphalt slurry seal. Strong materials, the specific plans are as follows:

A first aspect of the present invention provides a fast-hardening early-strength material used in emulsified asphalt slurry sealing layers. The raw materials are the following components by weight: 21 to 50 parts of magnesium phosphate cement matrix powder, 10 to 50 parts of emulsified asphalt. 25 parts, mixing water 5-15 parts, machine-made sand 5-20 parts, coarse aggregate 40-60 parts, anti-dispersion agent 0.5-1 part;

The magnesium phosphate cement powder consists of 10 to 20 parts of dead burnt magnesium oxide, 1 to 4 parts of borax, 5 to 10 parts of ammonium dihydrogen phosphate, 0 to 3 parts of mineral powder, 0 to 3 parts of silica fume, and 5 parts of fly ash. ~Made for 10 servings.

For the first aspect, the present invention also provides the following preferred technical solutions:

Emulsified asphalt: The emulsified asphalt in the present invention is a cationic polymer-modified emulsified asphalt with a solid content of 55% to 60%, which complies with the "Technical Guidelines for Microsurfacing and Slurry Sealing" (JTG/T F40-02-2005) Medium BCR type regulations.

Mixing water: Mixing water is the mixing water used to mix the above components. According to the water source, it can be divided into drinking water, surface water, groundwater, sea water, and industrial wastewater after appropriate treatment or disposal; usually, mixing water The source of water has almost no impact on the strength of concrete materials, and technicians can make routine selections according to the requirements of building regulations. In the embodiment provided by the present invention, tap water can be used as the mixing water.

Machine-made sand: Machine-made sand is sand processed through a sand making machine and other ancillary equipment. Compared with river sand, machine-made sand has little impact on the performance of the MPC material mixture. At the same time, machine-made sand also has a series of advantages such as energy saving and emission reduction, low pollution, and low manufacturing cost. Therefore, it is better to use machine-made sand as aggregate in this system. The particle size of machine-made sand is 40-80 mesh.

Coarse aggregate: This invention preferably uses basalt that is better compatible with cationic emulsified asphalt. The gradation uses SMA-13 with a dense skeleton structure. The aggregate is screened in accordance with JTG E42-2005 "Highway Engineering Aggregate Test Regulations".

Anti-dispersion agent: The anti-dispersion agent includes the following components by weight: 0.05 to 0.15 parts of cellulose ether, 1 to 3 parts of nano-SiO ₂ , and 0 to 5 parts of ultrafine fly ash. Among them, ultrafine fly ash plays a role in maintaining the stability of the slurry and has little impact on the fluidity. It plays an auxiliary role after the addition of cellulose ether and nano- _SiO2 . If the construction site has certain requirements on fluidity, it can be Increase the amount of ultrafine fly ash and reduce the amount of cellulose ether and nano- _SiO2 .

Relating to magnesium phosphate cement powder, the present invention also provides the following preferred solutions:

Dead-burned magnesium oxide: The dead-burned magnesium oxide used in the present invention is obtained by calcining magnesite at high temperature and then crushing and grinding. It has a light yellow appearance, a purity of 90% and above, and a fineness of no more than 200 mesh; specifically In the example, the purity of magnesium oxide is approximately 91%.

Borax: In the present invention, borax functions as a retarder in the material. Borax decahydrate is often used, which is a crystalline white powder with a density of 1.72g/cm ³ and a purity greater than 95%.

Ammonium dihydrogen phosphate: industrial grade, white powder particles, NH ₄ H ₂ PO ₄ content is 99%.

Ore powder: more than 80% of the mineral powder has a fineness less than 1 μm, and the average particle size is 0.1-0.3 μm.

Silica fume: The average particle size of silica fume is 0.1-0.15μm.

Fly ash: its average particle size distribution is about 8 to 20 μm, and its specific surface area is 300 to 600 m ² /kg; further, coarse aggregate is added according to 1.25 to 4 times the total mass of magnesium phosphate cement matrix powder, and the coarse aggregate is selected For gravel with smaller particle size and less variability (refer to the gravel particle size requirements in road maintenance standards), too small an amount of coarse aggregate will lead to an excessive difference in uniformity between the original asphalt pavement and the repair area. , and the pavement has poor skid resistance; and the excessive proportion of coarse aggregate causes the material to fail to wrap the coarse aggregate, and the coagulation performance between the aggregates is affected. According to the test, the coarse aggregate is 1.25 to 4 times the mass of the MPC In between, the performance is excellent.

A second aspect of the present invention provides a method for preparing the fast hardening and early strength material described in the first aspect, which includes the following steps:

Mix ammonium dihydrogen phosphate, borax, dead-burned magnesium oxide, mineral powder, silica fume, and fly ash according to a certain ratio to prepare MPC dry material; mix emulsified asphalt and mixing water for low-speed stirring, and slowly add MPC dry material Material and anti-dispersion agent, mix thoroughly to form MPC-EA cementing material;

Then, machine-made sand is added and stirred at high speed to form MPC-EA mortar; finally, coarse aggregate is added and stirred at high speed to prepare the MPC-EA mixture, which is spread on the road surface to form the slurry seal layer.

Preferably, the low-speed stirring speed is 140 ± 5 r/min, and the stirring time is 0.1 to 1 min.

Preferably, the above-mentioned MPC dry material and anti-dispersion agent should be added at a slow and uniform speed. In the preferred solution, the addition is completed within 0.8 to 1.2 minutes. After the addition, the MPC-EA cementing material is continuously stirred for 2 to 4 minutes.

Preferably, the speed of the high-speed stirring is 285 ± 3 r/min, and the stirring time is 3 to 5 minutes.

The above-mentioned MPC-EA mixture is paved on the road. If necessary, local construction defects can be repaired manually and maintained naturally for 1.5 to 2 hours before it can be opened to traffic.

Preferably, the paving and compaction speed of the MPC-EA mixture should be consistent with the mixing amount, and the thickness should not exceed 3cm.

In order to enable those skilled in the art to understand the technical solution of the present invention more clearly, the technical solution of the present invention will be described in detail below with reference to specific embodiments.

Example 1

A fast-hardening early-strength material used in emulsified asphalt slurry seals is mixed evenly with dead-burned magnesium oxide, ammonium dihydrogen phosphate and borax, configured to obtain a cementitious material, and then mixed with emulsified asphalt and water to obtain MPC-emulsified asphalt composite system. The mass fraction of magnesium phosphate cement-based materials: 15 parts of dead-burned magnesium oxide and 5 parts of ammonium dihydrogen phosphate, 1 part of borax, 5 parts of fly ash, 1 part of mineral powder, and 1 part of silica fume.

In the anti-dispersion agent, cellulose ether: nano-SiO ₂ : ultrafine fly ash = 0.05:1:3.

The dosage of emulsified asphalt is 12 parts; machine-made sand, 13 parts; SMA-13 coarse aggregate, 50 parts; and mixing water, 8 parts.

Mix ammonium dihydrogen phosphate, borax, dead-burned magnesium oxide, mineral powder, silica fume, and fly ash according to the proportions to prepare MPC dry material; mix emulsified asphalt and mixing water and stir at low speed for 1 minute, then slowly add MPC dry material and The anti-dispersion agent should be added within 0.8 to 1.2 minutes. After the addition, continue to stir for 2 to 4 minutes and mix thoroughly to form MPC-EA cement;

Then add machine-made sand and stir at high speed to form MPC-EA mortar; Finally, add coarse aggregate and stir at high speed for 4 minutes to prepare the MPC-EA mixture, which is spread on the road surface to form the slurry seal; the above mixing process is carried out in a planetary type It is carried out in a mortar mixer, using the instrument rotation mode. The high-speed mixing speed is 285±3r/min, and the low-speed mixing speed is 140±5r/min.

After mixing evenly according to the above mixing method, the working time is tested to be about 40 minutes. Pave the road section to be maintained evenly and compact it. Place warning signs and allow for natural curing for 2 hours before opening to traffic.

Example 2

The specific mode of this implementation is different from Example 1 only in the proportions of the following materials. The operating steps and material composition are basically the same. Dead-burned magnesium oxide, ammonium dihydrogen phosphate and borax are mixed evenly to prepare a gelling material, which is then mixed with Emulsified asphalt and water are mixed to obtain an MPC-emulsified asphalt composite system. The mass fraction of magnesium phosphate cement-based materials: 20 parts of dead-burned magnesium oxide and 7 parts of ammonium dihydrogen phosphate, 1.2 parts of borax, 10 parts of fly ash, 0 parts of mineral powder, and 2 parts of silica fume.

In the anti-dispersion agent, cellulose ether: nano-SiO ₂ : ultrafine fly ash = 0.1:1:5.

The dosage of emulsified asphalt is 20 parts; machine-made sand, 10 parts; SMA-13 aggregate, 60 parts; and mixing water, 8 parts.

After mixing evenly according to the mixing method in Example 1, the working time is tested to be about 23 minutes, and the road section to be maintained is paved evenly and compacted. Place warning signs and it will be open to traffic after 1.5 hours of natural curing.

Example 3

The specific mode of this implementation is different from Example 1 only in the proportions of the following materials. The operating steps and material composition are basically the same. Dead-burned magnesium oxide, ammonium dihydrogen phosphate and borax are mixed evenly to prepare a gelling material, which is then mixed with Emulsified asphalt and water are mixed to obtain an MPC-emulsified asphalt composite system: magnesium phosphate cement-based material mass fraction: 20 parts of burned magnesium oxide and 5 parts of ammonium dihydrogen phosphate, borax content is 1.6 parts, fly ash 15 parts, mineral powder 2 parts, 2 parts silica fume.

In the anti-dispersion agent, cellulose ether: nano-SiO ₂ : ultrafine fly ash = 0.1:2:0.

The dosage of emulsified asphalt is 25 parts; machine-made sand, 15 parts; SMA-13 aggregate, 40 parts; and mixing water, 10 parts.

After mixing evenly according to the mixing method in Example 1, the working time is tested to be about 20 minutes, and the road section to be maintained is paved evenly and compacted. Place warning signs and it will be open to traffic after 1.5 hours of natural curing.

Example 4

The specific mode of this implementation is different from Example 1 only in the proportions of the following materials. The operating steps and material composition are basically the same. Dead-burned magnesium oxide, ammonium dihydrogen phosphate and borax are mixed evenly to prepare a gelling material, which is then mixed with Emulsified asphalt with a solid content of 60% is mixed with water to obtain MPC-emulsified asphalt composite system magnesium phosphate cement-based material mass fraction: 15 parts of burned magnesium oxide and 5 parts of ammonium dihydrogen phosphate, 2 parts of borax, and 20 parts of fly ash parts, 5 parts of mineral powder, 5 parts of silica fume.

In the anti-dispersion agent, cellulose ether: nano-SiO ₂ : ultrafine fly ash = 0.15:3:10.

The dosage of emulsified asphalt is 30 parts; machine-made sand, 15 parts; SMA-13 aggregate, 45 parts; and mixing water, 10 parts.

After mixing evenly according to the mixing method in Example 1, the working time is tested to be about 50 minutes, and the road section to be maintained is paved evenly and compacted. Place warning signs and allow for natural curing for 2 hours before opening to traffic.

Example 5

The specific mode of this implementation is different from Example 1 only in the proportions of the following materials. The operating steps and material composition are basically the same. Dead-burned magnesium oxide, ammonium dihydrogen phosphate and borax are mixed evenly to prepare the cementing material magnesium phosphate cement. Base material mass fraction: 10 parts of dead burnt magnesium oxide and 5 parts of ammonium dihydrogen phosphate, 1 part of borax, 20 parts of fly ash, 7 parts of mineral powder, and 5 parts of silica fume.

In the anti-dispersion agent, cellulose ether: nano-SiO ₂ : ultrafine fly ash = 0.15:2:5.

The dosage of emulsified asphalt is 25 parts; machine-made sand, 15 parts; SMA-13 aggregate, 50 parts; and mixing water, 15 parts.

After mixing evenly according to the mixing method in Example 1, the working time is tested to be about 60 minutes, and the road section to be maintained is paved evenly and compacted. Place warning signs and allow for natural curing for 2 hours before opening to traffic.

There is no clear standard test method for the relevant performance of the MPC-emulsified asphalt composite system. Due to the rapid hardening characteristics of the material, the present invention mainly focuses on its working time (that is, the time when the slurry loses fluidity), hardening time, and unconfined resistance. Preliminary performance tests were conducted on compressive strength, flexural strength and bonding strength with the old matrix.

The specific performance parameter test values of Examples 1 to 5 are shown in Table 1:

Table 1 Material performance test results

It can be seen from the above test data that the setting time of the material of the present invention can be achieved by adjusting the mix ratio. The setting time can be adjusted within 30 to 70 minutes. The strength of the mixture is significantly higher than that of mortar under the same proportion. The composite material can adapt to different environments. Different construction requirements on different roads, simple maintenance conditions, little impact on traffic, greatly reducing economic losses and safety hazards; and the rapid hardening and early strength properties of MPC materials enable its strength to develop rapidly within 1 hour, which can be used to thin emulsified asphalt. Slurry sealant materials provide a new choice.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. The quick hardening early strength material applied to the emulsified asphalt slurry seal layer is characterized by comprising the following raw materials in parts by weight: 21-50 parts of magnesium phosphate cement matrix powder, 10-25 parts of emulsified asphalt, 5-15 parts of mixing water, 5-20 parts of machine-made sand, 40-60 parts of coarse aggregate and 0.5-1 part of anti-dispersant;

the magnesium phosphate cement powder is prepared from 10-20 parts of re-burned magnesium oxide, 1-4 parts of borax, 5-10 parts of monoammonium phosphate, 0-3 parts of mineral powder, 0-3 parts of silica fume and 5-10 parts of fly ash.

2. A rapid hardening early strength material for an emulsified asphalt slurry seal according to claim 1,

the emulsified asphalt is cationic polymer modified emulsified asphalt with the solid content of 55-60 percent, and accords with the BCR type regulation in micro-surfacing and slurry seal technical guidelines (JTG/T F40-02-2005);

the mixing water is tap water;

the grain diameter of the machine-made sand is 40-80 meshes;

the coarse aggregate is basalt, SMA-13 is selected for grading, and aggregate is screened according to JTG E42-2005 Highway engineering aggregate test procedure.

3. The rapid hardening early strength material applied to an emulsified asphalt slurry seal layer according to claim 1, wherein the anti-dispersant comprises the following components in parts by weight: cellulose ether 0.05-0.15 parts, nano SiO ₂ 1-3 parts of superfine fly ash and 0-5 parts of superfine fly ash.

4. The rapid hardening early strength material for an emulsified asphalt slurry seal layer according to claim 1, wherein the re-burned magnesia is obtained by calcining magnesite at high temperature, crushing and grinding, and has a light yellow appearance, purity of 90% or above, fineness of not more than 200 meshes and purity of 91%;

the borax adopts borax decahydrate as crystalline white powder with density of 1.72g/cm ³ The purity is more than 95 percent.

5. The rapid hardening early strength material for an emulsified asphalt slurry seal according to claim 1, wherein said monoammonium phosphate is technical grade, white powder particles, NH ₄ H ₂ PO ₄ The content is 99%;

the fineness of the mineral powder is less than 1 mu m and accounts for more than 80%, and the average grain diameter is 0.1-0.3 mu m.

6. The rapid hardening early strength material for an emulsified asphalt slurry seal layer according to claim 1, wherein the silica fume has an average particle diameter of 0.1 to 0.15 μm;

the average particle size distribution of the fly ash is 8-20 mu m, and the specific surface area is 300-600 m ² /kg。

7. The rapid hardening early-strength material applied to an emulsified asphalt slurry seal layer according to claim 1, wherein the coarse aggregate is added according to 1.25-4 times of the total mass of magnesium phosphate cement matrix powder, and the coarse aggregate selects broken stone with smaller particle size and smaller difference, and refers to the broken stone particle size requirement in a road maintenance standard.

8. The method for preparing the rapid hardening early strength material according to any one of claims 1 to 7, comprising the steps of: mixing monoammonium phosphate, borax, re-burned magnesia, mineral powder, silica fume and fly ash according to a certain proportion to prepare an MPC dry material; mixing emulsified asphalt and mixing water, stirring at a low speed, slowly adding MPC dry material and anti-dispersant, and fully and uniformly mixing to form MPC-EA cementing material;

then adding machine-made sand and stirring at high speed to form MPC-EA mortar; and finally adding coarse aggregate, stirring at a high speed to prepare an MPC-EA mixture, and paving the MPC-EA mixture on a pavement to form the slurry seal.

9. The method for preparing a rapid hardening early-strength material according to claim 8, wherein the rotation speed of the low-speed stirring is 140+ -5 r/min, the stirring time is 0.1-1 min, the rotation speed of the high-speed stirring is 285+ -3 r/min, and the stirring time is 3-5 min;

or, the MPC dry material and the anti-dispersant are added within 0.8-1.2 min, and stirring is continued for 2-4 min after the addition is finished, so as to obtain the MPC-EA cementing material.

10. The method for preparing the rapid hardening early-strength material according to claim 8, wherein the MPC-EA mixture is paved on a road surface, and natural curing is carried out for 1.5-2 hours, so that the traffic can be opened;

or, the paving compaction speed of the MPC-EA mixture is consistent with the mixing amount, and the thickness of the MPC-EA mixture is not more than 3cm.