A rapid-setting concrete material and a method for producing the same

Abstract

The application relates to the field of concrete, and discloses a rapid-setting concrete material and a preparation method thereof. In the application, a rapid-setting concrete material is prepared by taking epoxy resin, cement, coarse aggregate, fine aggregate, a rapid-setting agent, a water reducing agent and a toughening curing agent as raw materials; the fine aggregate is modified metakaolin; through the self-oxidation performance of hydrochloric acid dopamine, melanin-like nanoparticles are prepared and deposited on the metakaolin material to obtain modified metakaolin with excellent ultraviolet resistance; the modified metakaolin is mixed into the concrete material as the fine aggregate, and the ultraviolet aging resistance of the concrete material is improved; the modified calcium lignosulfonate nano powder is added in the application, and plays the role of ultraviolet aging resistance, and can also be used as a water reducing agent with good compatibility with the concrete material.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of concrete, and discloses a rapid-setting concrete material and a preparation method thereof. BACKGROUND

[0002] The epoxy resin concrete is a kind of polymer concrete formed by mixing epoxy resin as cementing material, adding appropriate amount of curing agent, toughening agent and other additives, and then mixing with sand and stone aggregate. However, the defects of the epoxy resin material itself will also affect the epoxy resin concrete material, such as brittleness of the epoxy resin itself, and the ultraviolet aging resistance still needs to be strengthened. Research shows that ultraviolet aging will increase the brittleness of the epoxy resin concrete, which is not conducive to the long-term use of the concrete material. Therefore, it is of great significance to prepare a rapid-setting concrete material with strong ultraviolet aging resistance and good toughness. SUMMARY

[0003] The present application aims to provide a preparation method of a rapid-setting concrete material to solve the problems in the background.

[0004] To solve the above technical problems, the present application provides the following technical scheme:

[0005] A preparation method of a rapid-setting concrete material, the preparation method of the concrete material comprising the following steps: taking cement, fine aggregate, coarse aggregate, water reducing agent and rapid-setting agent, mixing them uniformly, adding epoxy resin and toughening curing agent, stirring them uniformly, placing them for 6-10 minutes, spraying curing agent diluent, and obtaining the rapid-setting concrete material after 10-20 days.

[0006] More preferably, the concrete material comprises the following raw materials in terms of weight parts: 10-30 parts of epoxy resin, 3-7 parts of toughening curing agent, 18-36 parts of fine aggregate, 15-20 parts of cement, 90-110 parts of coarse aggregate, 2-4 parts of water reducing agent, 0.5-1.5 parts of rapid-setting agent, and the spraying amount of the curing agent diluent is 0.5-2 kg / 20 m 2 The mass ratio of the fine aggregate to the water reducing agent is 3:1.

[0007] More preferably, the formula of the curing agent diluent is that the ratio of water to curing agent is 1:2-1:4 in terms of volume ratio.

[0008] More preferably, the fine aggregate is modified metakaolin, and the rapid-setting agent is glycerol.

[0009] More preferably, the preparation method of the modified metakaolin comprises the following steps: adding dopamine hydrochloride into water, adding metakaolin and a dispersing agent, adjusting pH to 8-10, stirring at a speed of 400-600 r / min for 20-28 h at a temperature of 30-40 DEG C, freezing at a temperature of -15 to -20 DEG C for 10-15 h, and placing into a freeze dryer to freeze dry at a temperature of -15 to -20 DEG C for 45-55 h, so as to obtain the modified metakaolin.

[0010] More preferably, the modified metakaolin comprises the following raw materials in parts by weight: 20-30 parts of dopamine hydrochloride, 9000-16500 parts of water, 20-40 parts of metakaolin and 0.3-0.5 parts of a dispersing agent.

[0011] More preferably, the water reducing agent is modified calcium lignosulfonate nano powder.

[0012] More preferably, the preparation method of the modified calcium lignosulfonate nano powder comprises the following steps: dissolving calcium lignosulfonate in water, stirring at a speed of 700-1000 r / min for 1-2 h, dropping ethanol at a speed of 1-3 mL / min, continuing to stir at a speed of 700-1000 r / min for 0.5-2 h, obtaining a suspension, placing the suspension into a dialysis bag, soaking in ethanol for 40-50 h, obtaining a calcium lignosulfonate nanoparticle dispersion in the dialysis bag, adding a silane coupling agent thereto, heating to 60-70 DEG C, stirring for 2-4 h, and filtering and drying to obtain the modified calcium lignosulfonate nano powder.

[0013] More preferably, the modified calcium lignosulfonate nano powder comprises the following raw materials in parts by weight: 3-7 parts of calcium lignosulfonate, 120-420 parts of water, 1650-4410 parts of ethanol and 3-6 parts of a silane coupling agent.

[0014] More preferably, the silane coupling agent is KH560.

[0015] More preferably, the preparation method of the toughening curing agent comprises the following steps: dissolving 15-25 parts of m-xylylenediamine in 40-60 parts of a solvent, dropping 3-8 parts of a polyurethane prepolymer under nitrogen protection conditions while cooling to 10-20 DEG C, reacting for 1.5-2.5 h, and evaporating the solvent, so as to obtain the toughening curing agent.

[0016] More preferably, the solvent is ethyl acetate.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] (1) In the concrete material, two kinds of anti-ultraviolet substances are added: calcium lignin sulfonate is used as an ultraviolet shielding agent, and the mechanical barrier is formed by the hydroxyl group and the phenolic group in the lignin molecule, so as to prevent the penetration of ultraviolet rays; the melanin-like substance is used as an ultraviolet absorber, and its high refractive index and wide band absorption capacity enable it to have the ability of preventing ultraviolet radiation; the mass ratio of modified calcium lignin sulfonate nano powder to modified metakaolin is 1:3, which effectively improves the anti-ultraviolet aging performance of the concrete material.

[0019] (2) The modified metakaolin is selected as the fine aggregate, a melanin-like nano particle is prepared by using the self-oxidation performance of dopamine hydrochloride, and is deposited on the surface of the metakaolin, so that the metakaolin is modified to have the ability of absorbing ultraviolet rays; the modified metakaolin is mixed into the concrete material as the fine aggregate, so as to give the concrete material good anti-ultraviolet aging ability; at the same time, the amino group in the melanin-like nano particle can be added to the epoxy group of the epoxy resin and the modified calcium lignin sulfonate nano powder water reducing agent in the subsequent step, so as to help improve the mechanical properties of the concrete material.

[0020] (3) The modified calcium lignin sulfonate nano powder is selected as the concrete water reducing agent, and the nano particle of calcium lignin sulfonate can be more uniformly dispersed in the pores of the concrete material, and the epoxy group silane coupling agent gives it an epoxy group, so that it has good compatibility with the epoxy resin, and can be added to the amino group in the modified metakaolin, so as to improve the mechanical properties of the product. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0022] A preparation process of a rapid-setting concrete material, comprising the following raw materials: ethanol (CAS: 64-17-5); glycerol (CAS: 56-81-5, Nanjing Changjiang Jiangyu Energy Technology Co., Ltd.); polyurethane prepolymer (model number: HC-5185, NCO content: 3.0-3.5%, Wuhan Pengle Biological Technology Co., Ltd.); KH560 (CAS: 2530-83-8, Tesco Chemical Co., Ltd.); dopamine hydrochloride (CAS: 62-31-7, Sigma Aldrich Trading Co., Ltd.); calcium lignosulfonate (Mw: ~18,000, Sigma Aldrich Trading Co., Ltd.); metakaolin (model number: SP33, Guangzhou Zaichen Chemical Co., Ltd.); dispersant (model number: 9402G, Weifang Lu Yi Chemical Co., Ltd.); m-xylylenediamine (CAS: 1477-55-0, Sigma Aldrich Trading Co., Ltd.); ethyl acetate (CAS: 141-76-8, Sigma Aldrich Trading Co., Ltd.); epoxy resin (model number E44, epoxy equivalent weight: 210-230 g / eq, Jinan Chuangshi Chemical Co., Ltd.); curing agent (model number: YLD-700, Shandong Yonglida New Material Technology Co., Ltd.); concrete water reducer SPN (CAS: 8061-51-6, Hubei Jusheng Technology Co., Ltd.); cement (ordinary portland cement, CAS: 1327-39-5, Zhengzhou Aikemu Chemical Co., Ltd.); coarse aggregate (limestone, brand: Y-1, bulk density: 1280 g / cm 3 , Tianjin Yandong Mining Products Co., Ltd.).

[0023] The following parts are mass parts;

[0024] Example 1: S1: Take 25 parts of dopamine hydrochloride, add 12500 parts of water, 30 parts of metakaolin, 0.4 parts of dispersant, adjust the pH to 8.5, stir at a speed of 500 r / min for 24 h at a temperature of 35℃, freeze at -18℃ for 12 h, put into a freeze dryer, freeze dry at -18℃ for 48 h, and obtain modified metakaolin;

[0025] S2: Take 5 parts of calcium lignosulfonate, dissolve in 250 parts of water, stir at a speed of 800 r / min for 1 h, add 1500 parts of ethanol at a speed of 2 mL / min, continue to stir at a speed of 800 r / min for 1 h, obtain a suspension, put the suspension into a dialysis bag, soak in 1500 parts of ethanol for 48 h, and the dialysis bag is a calcium lignosulfonate nanoparticle dispersion;

[0026] S3: Take 5 parts of KH560 and add to the above calcium lignosulfonate nanoparticle dispersion, heat to 65℃, stir for 3 h, filter and dry to obtain modified calcium lignosulfonate nanopowder;

[0027] S4: Take 20 parts of m-xylylenediamine and 50 parts of ethyl acetate, under the condition of nitrogen protection, cooling to 15℃, drop 5 parts of polyurethane prepolymer, reaction 2h, evaporate ethyl acetate, get toughening curing agent;

[0028] S5: Take 27 parts of modified metakaolin, 16 parts of cement, 95 parts of coarse aggregate, 1 part of accelerator, 3 parts of modified calcium lignosulfonate nano powder, stir evenly, add 20 parts of epoxy resin and 5 parts of toughening curing agent, stand for 8min, spray concrete curing agent diluent, spraying amount is 1kg / 20m 2 , 15 days later, get the rapid setting concrete material.

[0029] Example 2: S1: Take 30 parts of dopamine hydrochloride, add 15000 parts of water, 40 parts of metakaolin, 0.5 parts of dispersant, adjust pH to 8.5, stir at 500r / min for 24h at 35℃, freeze at-18℃ for 12h, put into freeze dryer, freeze dry at-18℃ for 48h, get modified metakaolin;

[0030] S2: Take 7 parts of calcium lignosulfonate, dissolve in 350 parts of water, stir at 800r / min for 1h, drop 2100 parts of ethanol at the speed of 2mL / min, continue to stir at 800r / min for 1h, get the suspension, put the suspension into dialysis bag, soak in 2100 parts of ethanol for 48h, the dialysis bag is calcium lignosulfonate nanoparticle dispersion;

[0031] S3: Take 6 parts of KH560 and add to the above calcium lignosulfonate nanoparticle dispersion, heat to 65℃, stir for 3h, filter and dry to get modified calcium lignosulfonate nano powder;

[0032] S4: Take 25 parts of m-xylylenediamine and 50 parts of ethyl acetate, under the condition of nitrogen protection, cooling to 15℃, drop 8 parts of polyurethane prepolymer, reaction 2h, evaporate ethyl acetate, get toughening curing agent;

[0033] S5: Take 36 parts of modified metakaolin, 20 parts of cement, 110 parts of coarse aggregate, 1.5 parts of accelerator, 4 parts of modified calcium lignosulfonate nano powder, stir evenly, add 30 parts of epoxy resin and 7 parts of toughening curing agent, stand for 8min, spray concrete curing agent diluent, spraying amount is 1kg / 20m 2 , 15 days later, get the rapid setting concrete material.

[0034] Example 3: S1: Take 20 parts of dopamine hydrochloride, add 10000 parts of water, 20 parts of metakaolin, 0.3 parts of dispersing agent, adjust the pH to 8.5, stir at a speed of 500 r / min for 24 h at a temperature of 35℃, freeze at -18℃ for 12 h, put into a freeze dryer, freeze dry at -18℃ for 48 h, and obtain modified metakaolin;

[0035] S2: Take 3 parts of calcium lignosulfonate, dissolve in 150 parts of water, stir at a speed of 800 r / min for 1 h, add 900 parts of ethanol at a speed of 2 mL / min, continue to stir at a speed of 800 r / min for 1 h, and obtain a suspension, put the suspension into a dialysis bag, soak in 900 parts of ethanol for 48 h, and the dialysis bag is a calcium lignosulfonate nanoparticle dispersion;

[0036] S3: Take 3 parts of KH560 and add to the above calcium lignosulfonate nanoparticle dispersion, heat to 65℃, stir for 3 h, filter and dry to obtain modified calcium lignosulfonate nanopowder;

[0037] S4: Take 15 parts of m-xylylenediamine and 40 parts of ethyl acetate, cool to 15℃ under nitrogen protection, add 3 parts of polyurethane prepolymer dropwise, react for 2 h, and evaporate the ethyl acetate to obtain a toughening curing agent;

[0038] S5: Take 18 parts of modified metakaolin, 15 parts of cement, 90 parts of coarse aggregate, 1 part of accelerator, 2 parts of modified calcium lignosulfonate nanopowder, stir uniformly, add 10 parts of epoxy resin and 3 parts of toughening curing agent, stand for 8 min, spray concrete curing agent diluent, and the spraying amount is 1 kg / 20 m 2 , and after 15 days, obtain a quick-setting concrete material.

[0039] Comparative Example 1 (without modifying metakaolin, and the remaining method steps are consistent with Example 1): S1: Take 5 parts of calcium lignosulfonate, dissolve in 250 parts of water, stir at a speed of 800 r / min for 1 h, add 1500 parts of ethanol at a speed of 2 mL / min, continue to stir at a speed of 800 r / min for 1 h, and obtain a suspension, put the suspension into a dialysis bag, soak in 1500 parts of ethanol for 48 h, and the dialysis bag is a calcium lignosulfonate nanoparticle dispersion;

[0040] S2: Take 5 parts of KH560 and add to the above calcium lignosulfonate nanoparticle dispersion, heat to 65℃, stir for 3 h, filter and dry to obtain modified calcium lignosulfonate nanopowder;

[0041] S3: Take 20 parts of m-xylylenediamine and 50 parts of ethyl acetate, cool to 15℃ under nitrogen protection, add 5 parts of polyurethane prepolymer dropwise, react for 2 h, and evaporate the ethyl acetate to obtain a toughening curing agent;

[0042] S4: take 27 parts of metakaolin, 16 parts of cement, 95 parts of coarse aggregate, 1 part of accelerator, 3 parts of modified calcium lignosulfonate nano powder, stir evenly, take 20 parts of epoxy resin and 5 parts of toughening curing agent, stand for 8 min, spray concrete curing agent diluent, spraying amount is 1 kg / 20 m 2 , 15 days later, the rapid setting concrete material was obtained.

[0043] Comparative Example 2 (without using silane coupling agent, the rest of the method steps are consistent with Example 1): S1: take 25 parts of dopamine hydrochloride, add 12500 parts of water, 30 parts of metakaolin, 0.4 parts of dispersant, adjust pH to 8.5, stir at 35℃ temperature for 24h, freeze at-18℃ for 12h, put into freeze dryer, freeze dry at-18℃ for 48h, get modified metakaolin;

[0044] S2: take 5 parts of calcium lignosulfonate, dissolve in 250 parts of water, stir at 800r / min for 1h, add 1500 parts of ethanol at a speed of 2mL / min, continue to stir at 800r / min for 1h, get the suspension, put the suspension into dialysis bag, soak in 1500 parts of ethanol for 48h, the dialysis bag is calcium lignosulfonate nanoparticle dispersion, dry to get calcium lignosulfonate nano powder;

[0045] S3: take 20 parts of m-xylylenediamine and 50 parts of ethyl acetate, under the condition of nitrogen protection, cool to 15℃, add 5 parts of polyurethane prepolymer, react for 2h, evaporate ethyl acetate, get toughening curing agent;

[0046] S4: take 27 parts of modified metakaolin, 16 parts of cement, 95 parts of coarse aggregate, 1 part of accelerator, 3 parts of calcium lignosulfonate nano powder, stir evenly, take 20 parts of epoxy resin and 5 parts of toughening curing agent, stand for 8 min, spray concrete curing agent diluent, spraying amount is 1 kg / 20 m 2 , 15 days later, the rapid setting concrete material was obtained.

[0047] Comparative Example 3 (replace modified calcium lignosulfonate nano powder with modified calcium lignosulfonate powder, the rest of the method steps are consistent with Example 1): S1: take 25 parts of dopamine hydrochloride, add 12500 parts of water, 30 parts of metakaolin, 0.4 parts of dispersant, adjust pH to 8.5, stir at 35℃ temperature for 24h, freeze at-18℃ for 12h, put into freeze dryer, freeze dry at-18℃ for 48h, get modified metakaolin;

[0048] S2: take 5 parts of calcium lignosulfonate, dissolve in 250 parts of water, add 5 parts of KH560, heat to 65℃, stir for 3h, filter and dry to get modified calcium lignosulfonate;

[0049] S3: Take 20 parts of m-xylylenediamine and 50 parts of ethyl acetate, under the condition of nitrogen protection, cool to 15℃, add 5 parts of polyurethane prepolymer dropwise, react for 2h, evaporate ethyl acetate to obtain a toughening curing agent;

[0050] S4: Take 27 parts of modified metakaolin, 16 parts of cement, 95 parts of coarse aggregate, 1 part of accelerator, 3 parts of modified calcium lignosulfonate, stir uniformly, add 20 parts of epoxy resin and 5 parts of toughening curing agent, stand for 8min, spray concrete curing agent diluent, the spraying amount is 1kg / 20m 2 , 15 days later, get the rapid setting concrete material.

[0051] Comparative example 4 (change the mass ratio of modified metakaolin and modified calcium lignosulfonate nano powder to 1:1, the rest of the method steps are consistent with example 1): S1: Take 25 parts of dopamine hydrochloride, add 12500 parts of water, 30 parts of metakaolin, 0.4 parts of dispersing agent, adjust the pH to 8.5, stir at 500r / min for 24h at 35℃, freeze at-18℃ for 12h, put into the freeze dryer, freeze dry at-18℃ for 48h, get modified metakaolin;

[0052] S2: Take 25 parts of calcium lignosulfonate, dissolve in 1250 parts of water, stir at 800r / min for 1h, add 7500 parts of ethanol at a speed of 2mL / min, continue to stir at 800r / min for 1h, get the suspension, put the suspension into the dialysis bag, soak in 7500 parts of ethanol for 48h, the dialysis bag is the calcium lignosulfonate nanoparticle dispersion;

[0053] S3: Take 25 parts of KH560 and add it to the above calcium lignosulfonate nanoparticle dispersion, heat to 65℃, stir for 3h, filter and dry to get modified calcium lignosulfonate nano powder;

[0054] S4: Take 20 parts of m-xylylenediamine and 50 parts of ethyl acetate, under the condition of nitrogen protection, cool to 15℃, add 5 parts of polyurethane prepolymer dropwise, react for 2h, evaporate ethyl acetate to obtain a toughening curing agent;

[0055] S5: Take 15 parts of modified metakaolin, 16 parts of cement, 95 parts of coarse aggregate, 1 part of accelerator, 15 parts of modified calcium lignosulfonate nano powder, stir uniformly, add 20 parts of epoxy resin and 5 parts of toughening curing agent, stand for 8min, spray concrete curing agent diluent, the spraying amount is 1kg / 20m 2 , 15 days later, get the rapid setting concrete material.

[0056] Comparative Example 5 (using a concrete water reducer SPN instead of modified calcium lignin sulfonate nano powder, and the rest of the method steps are the same as Example 1) S1: Take 25 parts of dopamine hydrochloride, add 12500 parts of water, ultrasonic dispersion, add 30 parts of metakaolin, 0.4 parts of dispersing agent, adjust the pH to 8.5, stir at a speed of 500 r / min at a temperature of 35℃ for 24h, freeze at-18℃ for 12h, put into a freeze dryer, freeze dry at-18℃ for 48h, and get modified metakaolin;

[0057] S2: Take 20 parts of m-xylylenediamine and 50 parts of ethyl acetate, cool to 15℃ under nitrogen protection, add 5 parts of polyurethane prepolymer dropwise, react for 2h, and evaporate ethyl acetate to get a toughening curing agent;

[0058] S3: Take 27 parts of modified metakaolin, 16 parts of cement, 95 parts of coarse aggregate, 1 part of accelerator, 3 parts of polyglycerol concrete water reducer, stir uniformly, add 20 parts of epoxy resin and 5 parts of toughening curing agent, stand for 8min, spray concrete curing agent diluent, and the spraying amount is 1kg / 20m 2 , 15 days later, get a quick-setting concrete material.

[0059] Experiment: use ZW-015 type ultraviolet aging box to age the quick-setting concrete material, use a high-pressure mercury lamp in the test box, emit ultraviolet light with a spectral range of 320-390nm, main wave 365nm, lamp rated power 1000W, aging time 600h, and measure the mechanical properties of the quick-setting concrete material before and after aging: compressive strength f cu and elastic modulus E c ;

[0060] Note: compare the mechanical properties of the quick-setting concrete with similar test age and aging time. The mechanical properties of the specimen with aging time of 600h should be compared with the mechanical properties of the specimen with age of 28d without aging, and the obtained data are shown in the following table:

[0061]

[0062] Conclusion: from the above table, the performance of the rapid-setting concrete prepared in Example 1 is the best; from the comparative example, it can be seen that the addition of modified metakaolin and modified calcium lignosulfonate nano powder can improve the ultraviolet aging resistance of the concrete material, and the effect is the best when the mass ratio is 3:1, if the calcium lignosulfonate is too much, it will cause the mechanical properties of the concrete material to decrease, thus the importance of adding the two substances according to the provided formula is known; the lignosulfonate calcium is treated to obtain a nano material, which can be better dispersed in the pores of the concrete material, the silane coupling agent endows the lignosulfonate calcium nano material with an epoxy group, so that it has strong compatibility with the concrete material, and at the same time, it has an addition reaction with the amino group in the modified metakaolin material, thereby improving the mechanical properties of the concrete material;

[0063] In summary, using the preparation method provided by the present application, a rapid-setting concrete material with good ultraviolet aging resistance and mechanical properties can be prepared.

[0064] It should be noted that in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0065] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and does not limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a quick-setting concrete material, characterized in that, The concrete material is prepared by taking cement, fine aggregate, coarse aggregate, water-reducing agent, and quick-setting agent, mixing them evenly, adding epoxy resin and toughening curing agent, stirring evenly, letting it stand for 6-10 minutes, spraying the diluted curing agent, and obtaining quick-setting concrete material after 10-20 days. The fine aggregate is modified metakaolin. The preparation method of modified metakaolin is as follows: add dopamine hydrochloride to water, add metakaolin and dispersant, adjust the pH to 8~10, stir at 400~600 r / min for 20~28 h at 30~40℃, freeze at -15~-20℃ for 10~15 h, put it into a freeze dryer, freeze dry at -15~-20℃ for 45~55 h to obtain modified metakaolin; The water-reducing agent is modified calcium lignosulfonate nanoparticles. The preparation method of modified calcium lignosulfonate nanoparticles is as follows: calcium lignosulfonate is dissolved in water and stirred at 700~1000 r / min for 1~2 h. Ethanol is added dropwise at 1~3 mL / min, and stirring is continued at 700~1000 r / min for 0.5~2 h to obtain a suspension. The suspension is placed in a dialysis bag and soaked in ethanol for 40~50 h to obtain a dispersion of calcium lignosulfonate nanoparticles in the dialysis bag. A silane coupling agent is added to it, the temperature is raised to 60~70℃, and the mixture is stirred for 2~4 h. The mixture is then filtered and dried to obtain modified calcium lignosulfonate nanoparticles.

2. The method for preparing a quick-setting concrete material according to claim 1, characterized in that: The concrete material comprises the following raw materials, by weight: 10-30 parts epoxy resin, 3-7 parts toughening and curing agent, 18-36 parts fine aggregate, 15-20 parts cement, 90-110 parts coarse aggregate, 2-4 parts water-reducing agent, 0.5-1.5 parts quick-setting agent, and the spraying amount of the curing agent dilution is 0.5-2 kg / 20m². 2 The mass ratio of fine aggregate to water-reducing agent is 3:

1.

3. The method for preparing a quick-setting concrete material according to claim 1, characterized in that: The modified metakaolin comprises the following raw materials, by weight: 20-30 parts dopamine hydrochloride, 9000-16500 parts water, 20-40 parts metakaolin, and 0.3-0.5 parts dispersant.

4. The method for preparing a quick-setting concrete material according to claim 1, characterized in that: The modified calcium lignosulfonate nanopowder comprises the following raw materials, by weight: 3-7 parts calcium lignosulfonate, 120-420 parts water, 1650-4410 parts ethanol, and 3-6 parts silane coupling agent.

5. The method for preparing a quick-setting concrete material according to claim 1, characterized in that: The toughening curing agent is prepared by dissolving 15-25 parts of m-phenylenediamine in 40-60 parts of solvent, cooling to 10-20°C under nitrogen protection, adding 3-8 parts of polyurethane prepolymer dropwise, reacting for 1.5-2.5 hours, evaporating the solvent, and obtaining the toughening curing agent.

6. The quick-setting concrete material obtained by the preparation method of a quick-setting concrete material according to any one of claims 1 to 5.

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