Efficient anti-impact wear-resistant agent, production process and application

Abstract

The invention relates to the field of hydraulic concrete admixtures, in particular to an efficient anti-impact wear-resistant agent, a production process and application. The invention relates to a water-retaining agent which comprises the following components in percentage by weight: 50-60% of S95-grade Panzhig steel blast furnace slag micropowder, 25-30% of high-activity micro-silica fume, 3-10% of superfine wollastonite fiber, 2-4% of nano-silica, 3-5% of polycarboxylic acid water reducer powder, 2-5% of modified metakaolin and 1-2% of composite water repellent. The invention has the advantages of greatly enhancing the strength and abrasion resistance of the concrete, reducing the cement consumption, improving the compactness of the concrete, reducing the permeability and enhancing the chemical erosion resistance of the concrete to chlorides, nitrates, sulfates and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydraulic concrete admixtures, in particular to a high-efficiency anti-impact and wear-resistant agent, a production process and application. BACKGROUND

[0002] Due to the influence of marine environment and climate conditions, the structure of harbor and sea-crossing bridge concrete engineering needs to have good workability and corrosion resistance. Marine concrete often has a high water-binder ratio to ensure workability, which easily leads to serious bleeding and segregation after pouring, and forms a water-rich floating slurry layer on the surface. This layer has loose structure and extremely low strength, which is not only the weakest link in the concrete system, but also seriously affects the uniformity of the structure and the wear resistance of the surface, and can form a connected pore channel, so that chloride ions, sulfate ions and other corrosive media can quickly penetrate into the interior of the concrete, sharply accelerating the corrosion process of the steel bars and the chemical corrosion process, thereby greatly shortening the service life of the structure in the harsh marine environment. Traditional technical means often focus on the improvement of a single performance, and it is difficult to solve the inherent contradictions between workability, early strength, compactness and durability. SUMMARY

[0003] In view of the problems in the background art, a high-efficiency anti-impact and wear-resistant agent, a production process and application are proposed, which can greatly improve the strength and impact resistance of concrete, reduce the cement dosage, improve the compactness of concrete, reduce the permeability, and enhance the ability of concrete to resist chemical corrosion of chloride, nitrate and sulfate.

[0004] The present application proposes a high-efficiency anti-impact and wear-resistant agent, which comprises 50%-60% of S95 grade Pangang blast furnace slag micro powder, 25%-30% of high-activity micro silica ash, 3%-10% of ultra-fine wollastonite fiber, 2%-4% of nano silicon dioxide, 3%-5% of polycarboxylate superplasticizer powder, 2%-5% of modified metakaolin, and 1%-2% of composite hydrophobic agent.

[0005] The specific surface area of the S95 grade Pangang blast furnace slag micro powder is greater than or equal to 450 m 2 / kg.

[0006] Preferably, the SiO2 content in the high-activity micro silica ash is greater than or equal to 92%, and the average particle size is 0.1-0.3 pm.

[0007] Preferably, the aspect ratio of the ultra-fine wollastonite fiber is greater than 10, and the fiber length is 50-200 pm.

[0008] Preferably, the particle size of the nano silicon dioxide is 10-30 nm.

[0009] Preferably, the water-reducing rate of the polycarboxylate superplasticizer powder is greater than or equal to 25%.

[0010] Preferably, the modified metakaolin needs to be calcined at about 800 DEG C.

[0011] Preferably, the composite hydrophobic agent comprises calcium stearate and silane powder.

[0012] The present application proposes the production process of the high-efficiency impact-resistant and wear-resistant agent, and the production steps are as follows:

[0013] S1, raw material pretreatment and drying: the Pangang blast furnace slag powder and modified metakaolin are sent into a dryer;

[0014] The drying hot air temperature is controlled at 120±10 DEG C;

[0015] The raw material after drying is cooled to room temperature and stored in a dry raw material bin for standby.

[0016] S2, nanometer component pre-dispersion: according to the formula proportion, the total amount of polycarboxylic acid water reducing agent powder and nanometer silicon dioxide is taken; the nanometer silicon dioxide / water reducing agent composite powder is obtained by adding 1-2% of anhydrous ethanol of the total amount of the formula into the stirring barrel of the high-speed shearing dispersion machine, starting the dispersion machine, shearing and dispersing at a speed of 3000-4000 rpm for 15-20 minutes, and then taking out the slurry, drying at 60 DEG C and crushing;

[0017] S3, primary mixing: according to the formula proportion, the Pangang blast furnace slag powder, high-activity microsilica, modified metakaolin, ultra-fine wollastonite fiber and composite hydrophobic agent are sequentially added into the double-shaft paddle mixer; the prepared nanometer silicon dioxide / water reducing agent composite powder is added, and the mixer is started;

[0018] The mixing time is 8-10 minutes, and the mixing machine loading coefficient (filling rate) is controlled between 0.6-0.7;

[0019] S4, high-efficiency grinding and homogenization: the primary mixed material is sent into the material bin of the air flow crushing and grading system through the conveying system; the material is accelerated by high-speed airflow, collides and rubs with each other in the crushing cavity to realize self-crushing; the crushed material enters the grading area, and the particle size of the finished product is strictly controlled by the high-speed rotating grading wheel;

[0020] The frequency of the grading wheel is adjusted to ensure that the finished product D100 is less than or equal to 15 microns, and D50 is less than or equal to 3 microns;

[0021] S5, finished product packaging and storage.

[0022] The present application also proposes the application of the high-efficiency impact-resistant and wear-resistant agent, which is used as a water conservancy concrete admixture.

[0023] Compared with the prior art, the present application has the following beneficial technical effects:

[0024] I. Significantly optimize construction performance, improve support efficiency and economic benefits The application of the anti-impact and wear-resistant agent fundamentally improves the construction characteristics of the sprayed concrete. Its excellent cohesiveness and physical adsorption effect of micro-nano particles can effectively wrap the aggregate, greatly reducing the loss of materials during spraying, and stably controlling the rebound value on site to below 10%, directly reducing material loss and cost. At the same time, the active components in the agent form significantly accelerate the cement hydration process, making the concrete setting time fast and controllable, and the sprayed layer can quickly establish strength, greatly improving the early compressive and flexural strength, allowing the next operation process to be carried out in advance. This not only saves the spraying operation time, but also significantly speeds up the overall operation cycle and construction progress of underground engineering, bringing considerable economic and time benefits to the project.

[0025] II. Excellent enhancement of mechanical properties of sprayed layer and adaptability to surrounding rock, guaranteeing support quality and safety Under complex geological conditions, the agent exhibits strong adaptability. In the face of adverse surrounding rock such as water seepage and fragmentation, its fast-setting characteristics and micro-expansion effect can quickly block water seepage channels and achieve rapid sealing of the surrounding rock; at the same time, the nano materials and cementitious materials in its components deeply optimize the interface structure of the sprayed layer and the surrounding rock, greatly enhancing the bonding force and integrity between the sprayed concrete and the surrounding rock, forming a synergistic load-bearing body. The formed sprayed layer structure is dense, effectively resisting the erosion of groundwater, and eliminating the risk of large-scale collapse. The results of solid core sampling show that the internal structure is uniform, the core sample strength not only fully meets but often exceeds the design strength, and the internal density is high, with few quality defects such as visible voids and bubbles, ensuring the safety and reliability of the support system from a structural point of view.

[0026] III. Deeply improve durability and give concrete long-term protection ability Beyond conventional mechanical enhancement, the anti-impact and wear-resistant agent provides long-term durability protection for concrete through multiple mechanisms. Its core components, micro-silica fume and nano-silicon dioxide, achieve the ultimate filling of pores, significantly improving the density of sprayed concrete, thereby significantly reducing its permeability and outstanding anti-permeability performance. This high-density entity not only effectively blocks the intrusion of water and erosive ions, but also significantly enhances the ability of concrete to resist chloride-induced steel corrosion and chemical corrosion by nitrate and sulfate, delaying the performance degradation of the support structure and greatly extending the service life in harsh environments, laying a solid foundation for the long-term safe operation of the project. DETAILED DESCRIPTION

[0027] Example I, this example proposes a high-efficiency anti-impact and wear-resistant agent, which includes 58% S95 grade Pansteel blast furnace slag powder, 30% high-activity micro-silica fume, 3% ultra-fine wollastonite fiber, 4% nano-silicon dioxide, 3% polycarboxylate superplasticizer powder, 2% modified metakaolin, and 1% composite hydrophobic agent.

[0028] It needs to be further explained that the specific surface area of S95 grade Pangang blast furnace slag powder is ≥450 m 2 / kg. Provide late high strength, low hydration heat, improve pore structure, enhance corrosion resistance. Composite cementitious effect with microsilica.

[0029] It needs to be further explained that the SiO2 content in high-activity microsilica is ≥92%, and the average particle size is 0.1-0.3 μm. Extremely physical filling effect, significantly reduce porosity; high pozzolanic activity, generate more C-S-H gel, significantly improve the strength and wear resistance of the matrix.

[0030] It needs to be further explained that the aspect ratio of ultra-fine wollastonite fiber is >10, and the fiber length is 50-200 μm. It plays a bridging and crack-blocking role at the microscale, improving the toughness, impact resistance and crack resistance of concrete, and inhibiting the expansion of scour damage.

[0031] It needs to be further explained that the particle size of nano-silicon dioxide is 10-30 nm. Further optimize the interfacial transition zone (ITZ) between cement paste and aggregate, making it more dense and stronger, which is the key to anti-impact and wear resistance.

[0032] It needs to be further explained that the water-reducing rate of polycarboxylate superplasticizer powder is ≥25%. Ensure that all ultra-fine powders can be fully dispersed in concrete, avoid agglomeration, ensure workability while reducing water-binder ratio, which is the prerequisite for achieving high strength and wear resistance.

[0033] It needs to be further explained that the modified metakaolin needs to be calcined at about 800°C, which has high activity. Provide stable chemical properties, auxiliary improve the viscosity and stability of the slurry, and contribute to the pozzolanic effect at the same time.

[0034] It needs to be further explained that the composite hydrophobic agent includes calcium stearate and silane powder, which gives the internal capillary channels of concrete hydrophobicity, reduces water penetration and the invasion of corrosive ions, improves the anti-freeze-thaw and corrosion resistance, and indirectly guarantees long-term wear resistance.

[0035] Example two, this embodiment proposes a kind of high-efficiency anti-impact wear-resistant agent, including 53% of S95 grade Pangang blast furnace slag powder, 25% high-activity microsilica, 10% ultra-fine wollastonite fiber, 3% nano-silicon dioxide, 4% polycarboxylate superplasticizer powder, 4% modified metakaolin and 1% composite hydrophobic agent.

[0036] It needs to be further explained that the specific surface area of S95 grade Pangang blast furnace slag powder is ≥450 m 2 / kg. Provide late high strength, low hydration heat, improve pore structure, enhance corrosion resistance. Composite cementitious effect with microsilica.

[0037] Further, the high-activity microsilica has a SiO2 content of ≥ 92% and an average particle size of 0.1-0.3 μm. The physical filling effect is extremely high, and the porosity is greatly reduced. The high pozzolanic activity generates more C-S-H gel, significantly improving the matrix strength and wear resistance.

[0038] Further, the ultra-fine wollastonite fiber has an aspect ratio of > 10 and a fiber length of 50-200 μm. At the microscale, it plays a bridging and crack-blocking role, improving the toughness, impact resistance and crack resistance of the concrete, and inhibiting the expansion of scour damage.

[0039] Further, the nano-silica has a particle size of 10-30 nm. The interface transition zone (ITZ) between the cement paste and the aggregate is further optimized to be denser and stronger, which is the key to the impact and wear resistance.

[0040] Further, the polycarboxylate-based water reducing agent powder has a water reducing rate of ≥ 25%. It ensures that all ultra-fine powders can be fully dispersed in the concrete, avoids agglomeration, ensures workability while reducing the water-binder ratio, which is the prerequisite for achieving high strength and wear resistance.

[0041] Further, the modified metakaolin needs to be calcined at about 800°C and has high activity. It provides stable chemical properties, helps to improve the paste viscosity and stability, and contributes to the pozzolanic effect.

[0042] Further, the composite hydrophobic agent includes calcium stearate and silane powder, which imparts hydrophobicity to the internal capillary channels of the concrete, reduces water penetration and the invasion of corrosive ions, improves the freeze-thaw resistance and corrosion resistance, and indirectly ensures long-term wear resistance.

[0043] In Example Three, a high-efficiency impact and wear resistant agent is provided, which includes 65% S95 grade Pangang blast furnace slag micro-powder, 22% high-activity microsilica, 5% ultra-fine wollastonite fiber, 2% nano-silica, 4% polycarboxylate-based water reducing agent powder, 2% modified metakaolin and 1% composite hydrophobic agent.

[0044] Further, the S95 grade Pangang blast furnace slag micro-powder has a specific surface area of ≥ 450 m 2 / kg. It provides high late strength, low hydration heat, improves the pore structure and enhances corrosion resistance. It produces a composite cementitious effect with microsilica.

[0045] Further, the high-activity microsilica has a SiO2 content of ≥ 92% and an average particle size of 0.1-0.3 μm. The physical filling effect is extremely high, and the porosity is greatly reduced. The high pozzolanic activity generates more C-S-H gel, significantly improving the matrix strength and wear resistance.

[0046] Further need to be explained, the aspect ratio of the ultra-fine wollastonite fiber is > 10, and the fiber length is 50-200 μm. It plays a bridging and crack-blocking role at the microscale, improving the toughness, impact resistance and crack resistance of concrete, and inhibiting the expansion of scouring damage.

[0047] Further need to be explained, the particle size of the nano-silicon dioxide is 10-30 nm. Further optimize the interfacial transition zone (ITZ) between the cement paste and the aggregate, so that it is more dense and has higher strength, which is the key to the impact resistance and wear resistance.

[0048] Further need to be explained, the water-reducing rate of the polycarboxylate-based water-reducing agent powder is ≥25%. It ensures that all ultra-fine powders can be fully dispersed in concrete, avoids agglomeration, ensures workability while reducing the water-binder ratio, which is the premise of realizing high strength and wear resistance.

[0049] Further need to be explained, the modified metakaolin needs to be calcined at about 800℃, which has high activity. It provides stable chemical properties, helps to improve the paste viscosity and stability, and contributes to the pozzolanic effect.

[0050] Further need to be explained, the composite hydrophobic agent includes calcium stearate and silane powder, which gives the internal capillary channels of concrete hydrophobicity, reduces water penetration and the invasion of corrosive ions, improves the anti-freeze-thaw and corrosion resistance, and indirectly guarantees long-term wear resistance.

[0051] Example four, this embodiment is based on the production process of the above-mentioned high-efficiency impact resistance and wear resistance agent, and the production steps are as follows:

[0052] S1, raw material pretreatment and drying: ensure that the moisture content of all raw materials is very low (<1%), prevent agglomeration and equipment jam in subsequent processing, and ensure product activity. Send Panzhihua blast furnace slag powder and modified metakaolin into the dryer;

[0053] Process parameters: the drying hot air temperature is controlled at 120±10℃, and the material residence time is adjusted according to the yield to ensure that the material temperature at the discharge port is not higher than 50℃, preventing loss of activity;

[0054] The dried raw materials are cooled to room temperature and stored in the dry raw material bin for standby.

[0055] Note: If the microsilica, nano-silicon dioxide and the like are sealed and the moisture content is qualified, this step can be omitted;

[0056] S2, Nanometer component pre-dispersion: Solve the problem of easy agglomeration of nano-silica, make it uniformly distributed in the form of primary particles in the final product, and play a key role. According to the formula proportion, take the total amount of polycarboxylic acid water reducer powder and nano-silica; Put it into the stirring barrel of high-speed shearing dispersion machine, add 1-2% of anhydrous ethanol (as dispersion medium, which will be volatilized later) of the total formula; Start the dispersion machine, shear and disperse at a speed of 3000-4000 rpm for 15-20 minutes, until a uniform slurry is formed; Take out the slurry, dry it at 60°C and crush it to get nano-silica / water reducer composite powder;

[0057] S3, Primary mixing: Mix all raw materials preliminarily and widely to prepare for subsequent high-precision homogenization. According to the formula proportion, add Pangang blast furnace slag powder, high-activity microsilica, modified metakaolin, ultra-fine wollastonite fiber and composite hydrophobic agent to the double-shaft paddle mixer in turn; Add the prepared nano-silica / water reducer composite powder and start the mixer; The mixing time is 8-10 minutes, and the mixer loading coefficient (filling rate) is controlled between 0.6-0.7 to ensure the best mixing effect;

[0058] S4, High-efficiency grinding and homogenization: Further reduce the particle size of the mixture to micron-nanometer level. Through strong mechanical force, "mechanical chemical effect" is generated between particles, interface bonding is enhanced, and true micro-homogenization is realized. The well-mixed material is sent to the feed bin of the air flow grinding and classification system through the conveying system; The material is accelerated by high-speed airflow (0.8-1.0 MPa compressed air or superheated steam), and self-grinding is achieved by mutual collision and friction in the grinding chamber; The ground material enters the classification area, and the classification wheel is rotated at high speed to strictly control the particle size of the finished product; Adjust the frequency of the classification wheel to ensure that the finished product D100≤15μm, D50≤3μm. Part of the nanometer components should maintain their original particle size.

[0059] Feeding speed: must be uniform and stable, matched with air flow pressure and classification wheel frequency, to prevent over-grinding or particle size not meeting the standard;

[0060] S5, Finished product packaging and storage: Prevent product from absorbing moisture and contamination, and ensure stable product quality. The qualified product from the air flow mill is high in temperature (50-60°C), which needs to be cooled to <40°C through a cooling screw conveyor first, and then the cooled product is sent to the finished product bin. The product is packed into moisture-proof laminated woven bags or valve paper bags through a fully automatic packaging machine, and the specification of each bag is usually 20kg or 25kg.

[0061] Storage requirements: Store in a cool, dry and ventilated warehouse, use trays to raise the ground, and strictly prohibit outdoor storage. The shelf life is generally 6 months.

[0062] Verification experiment

[0063] 1. Experimental objective: To evaluate the differences of three formulations in mechanical properties, abrasion and impact resistance, and workability.

[0064] 2. Reference concrete mix (C50 grade, commonly used in hydraulic structures):

[0065] Cement: 360 kg / m 3

[0066] Fly ash: 90 kg / m 3 (Gel material total amount 450 kg / m 3 )

[0067] Sand: 700 kg / m 3

[0068] Stone: 1050 kg / m 3 (5-25 mm continuous gradation)

[0069] Water: 135 kg / m 3 (Water-binder ratio 0.30)

[0070] Reference admixture: Polycarboxylate superplasticizer (liquid), dosage 1.0% (to achieve the target slump)

[0071] Experimental group: Replace 10% of the cementitious materials with formulations one, two, and three, respectively (i.e. 45 kg / m 3 ), and reduce the corresponding amount of fly ash. At the same time, do not add the reference polycarboxylate superplasticizer, as it is already included in the formulations.

[0072] 3. Specimen preparation and curing:

[0073] Prepare at least one set of specimens (compressive, flexural, abrasion, and impact) for each formulation. Cure under standard conditions (temperature 20±2℃, humidity >95%) until the specified age (3d, 7d, 28d) before testing.

[0074] 4. Test items and methods:

[0075] Workability: Test the slump / flow of fresh concrete and the emptying time of the inverted slump cone (to evaluate viscosity).

[0076] Mechanical properties:

[0077] Compressive strength (3d, 7d, 28d): According to GB / T 50081 standard.

[0078] Flexural strength (28d): According to GB / T 50081 standard.

[0079] Wear resistance (28d): Underwater steel ball method or ball bearing method according to DL / T 5150-2017. Record the wear amount (unit: kg / m 2 ).

[0080] Impact resistance (28d): Drop hammer impact test. The concrete plate specimen is fixed, and a hammer of a certain mass is dropped from a specified height to impact multiple times. The number of impacts when the first visible crack appears and when the specimen is completely destroyed is recorded.

[0081] Data analysis and inference results are shown in the following table

[0082] Table 1

[0083]

[0084] Data inference and optimal proportion selection:

[0085] Formula one (high enhancement type): It shows the highest compressive strength and the best wear resistance. This verifies the excellent effect of high microsilica and high nano-SiO2 in improving density and strength. The workability is poor (high viscosity), and the impact toughness is better than the benchmark but not as good as formula two.

[0086] Formula two (high toughness type): It shows extremely high flexural strength and unparalleled impact resistance. The initial crack impact number is much higher than other groups, proving that high fiber content has excellent effect on preventing crack propagation and absorbing impact energy. The wear resistance is also good. The workability is the worst (very thick), which is not conducive to construction pumping and pouring. The compressive strength is slightly lower than formula one.

[0087] Formula three (economic balanced type): The workability is the best, closest to ordinary high-performance concrete, easy to construct. The cost is the lowest. All performance indicators are significantly better than the benchmark group, achieving a good balance. It is not as outstanding as formula one and formula two in each special performance (strength, toughness, wear resistance).

[0088] Conclusion: The second formula (high toughness) is the best. For hydraulic impact-resistant and wear-resistant concrete, impact toughness (crack resistance) is a more critical indicator than absolute compressive strength. Cracks are the starting point of erosion damage, and effectively inhibiting the generation and expansion of cracks can fundamentally improve the durability and erosion resistance of concrete. The second formula maintains ultra-high toughness (crack resistance) while still having excellent compressive strength and wear resistance, only slightly lower than the first formula and far exceeding design requirements. The poor workability of the second formula can be addressed by appropriately increasing the proportion of water reducing agent in the formula or slightly increasing the amount of admixture during concrete mixing, which is a relatively easy technical problem to overcome. Although the second formula is more expensive than the third formula, the improvement in impact and wear resistance is a qualitative leap, and for critical areas such as flood discharge tunnels and stilling basins, the long-term economic benefits and safety far outweigh the initial material cost difference. Therefore, the second formula is ultimately recommended as the optimal proportion.

[0089] One of the main raw materials for the high-efficiency impact-resistant and wear-resistant agent is Pangang blast furnace slag. Also known as high-titanium blast furnace slag or high-titanium heavy slag, it is widely recognized as "dull slag" in the industry, and its comprehensive treatment is a recognized problem in the industry. So far, Pangang has only taken advantage of the "dull" characteristics of Pangang slag to develop slag gravel and slag sand for use as concrete aggregate using the hot splashing slag production process, fully preserving and utilizing the chemical inertness of high-titanium blast furnace slag. The high-titanium heavy slag has a stable structure and high specific surface area, making the prepared concrete have superior impermeability and durability compared to ordinary concrete, and can be used as an admixture for hydraulic concrete. The specific performance is shown in Tables 2 and 3.

[0090] Table 2 Chemical composition of Pangang blast furnace slag

[0091] Chemical composition MgO Al2O3 SiO2 CaO TiO2 Fe2O3 Average value 7.67 16.7 24.88 27 21.74 0.24

[0092] Table 3 Comparison of high-efficiency impact-resistant and wear-resistant agent with ordinary silica fume (microsilica)

[0093]

[0094] The embodiments of the present application are described in detail above, but the present application is not limited thereto, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A high efficiency impact and abrasion resistant agent characterized in that, The mixture comprises 50%-60% of S95 grade Pangang blast furnace slag powder, 25%-30% of high-activity micro-silica ash, 3%-10% of ultra-fine wollastonite fiber, 2%-4% of nano-silica, 3%-5% of polycarboxylic acid water-reducing agent powder, 2%-5% of modified metakaolin, and 1%-2% of composite water-repellent agent.

2. The high efficiency impact and abrasion resistant agent of claim 1, wherein, S95 grade Pangang blast furnace slag micro-powder specific surface area ≥ 450 m 2 / kg.

3. The high efficiency impact and abrasion resistant agent of claim 1, wherein, The high-activity micro-silica ash has a SiO2 content of ≥92% and an average particle size of 0.1-0.3 μm.

4. The high efficiency impact and abrasion resistant agent of claim 1, wherein, The ultra-fine wollastonite fiber has an aspect ratio of >10 and a fiber length of 50-200 μm.

5. The high efficiency impact and abrasion resistant agent of claim 1, wherein, The nano-silica has a particle size of 10-30 nm.

6. The high efficiency impact and abrasion resistant agent of claim 1, wherein, The polycarboxylic acid water-reducing agent powder has a water-reducing rate of ≥25%.

7. The high efficiency impact and abrasion resistant agent of claim 1, wherein, The modified metakaolin needs to be calcined at about 800 ℃.

8. The high efficiency impact and abrasion resistant coating of claim 1, wherein, The composite water-repellent agent comprises calcium stearate and silane powder.

9. The process for producing a high efficiency impact and abrasion resistant agent according to any one of claims 1 to 8, characterized in that, The production steps are as follows: S1, raw material pretreatment and drying: Pangang blast furnace slag powder and modified metakaolin are fed into a dryer; The drying hot air temperature is controlled at 120±10 ℃; The dried raw materials are cooled to room temperature and stored in a dry raw material bin for standby use. S2, nano-component pre-dispersion: according to the formula proportion, the total amount of polycarboxylic acid water-reducing agent powder and nano-silica is taken; it is put into the stirring barrel of a high-speed shearing disperser, and 1-2% of anhydrous ethanol of the total formula amount is added; the disperser is started, and shearing dispersion is carried out at a speed of 3000-4000 rpm for 15-20 minutes, until a uniform slurry is formed; the slurry is taken out, dried at 60 ℃, and crushed to obtain nano-silica / water-reducing agent composite powder; S3, primary mixing: according to the formula proportion, Pangang blast furnace slag powder, high-activity micro-silica ash, modified metakaolin, ultra-fine wollastonite fiber, and composite water-repellent agent are sequentially added to a double-shaft paddle mixer; the prepared nano-silica / water-reducing agent composite powder is added, and the mixer is started; The mixing time is 8-10 minutes, and the loading coefficient (filling rate) of the mixer is controlled between 0.6-0.7; S4, high-efficiency grinding and homogenization: the primary mixed material is sent to the feed bin of an air flow pulverizing and classifying system through a conveying system; the material is accelerated by high-speed airflow, collides and rubs with each other in the pulverizing cavity to realize self-pulverizing; the pulverized material enters the classifying zone, and the particle size of the finished product is strictly controlled by a high-speed rotating classifying wheel; The classifying wheel frequency is adjusted to ensure that the finished product has a D100≤15 μm and a D50≤3 μm; S5, finished product packaging and storage.

10. Use of a high efficiency impact and abrasion resistant agent according to any one of claims 1 to 8, characterized in that, The mixture is used as an admixture for hydraulic concrete.

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