Preparation process of heat-resistant and crack-resistant concrete

Abstract

The present invention relates to the technical field of building materials, and more particularly to a process for preparing heat-resistant and crack-resistant concrete. The preparation process comprises the following steps: preparing a suspension; preparing and treating PVA fibers; modifying and treating the PVA fibers with a VAE emulsion; and preparing concrete. The present invention utilizes calcium carbonate whiskers and a water reducer to form a suspension, and treats the PVA fibers with anatase and fly ash. The water reducer can reduce the water requirement of the material and improve the fluidity of the slurry, thereby allowing the PVA fibers and powder to be evenly mixed. The anatase powder and fly ash can be evenly distributed in the slurry and then coated on the PVA fibers. The tiny fly ash particles attract each other, allowing the treated PVA fibers to be tightly bonded to each other, thereby improving the compressive and crack-resistant properties of the concrete material.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a preparation process of heat-resistant and crack-resistant concrete. Background Art

[0002] Crack-resistant concrete is a specially formulated concrete mix designed to reduce or prevent cracks that develop during the concrete hardening process. Concrete cracking is typically caused by factors such as shrinkage, temperature fluctuations, drying, uneven settlement, or internal stresses. To improve concrete's crack resistance, fibers are often added to increase its tensile strength, thereby preventing cracks from forming.

[0003] However, existing technologies generally directly add steel fibers or polypropylene fibers to concrete without processing the fibers, resulting in poor bonding between the fibers and concrete and limited improvement in crack resistance and compressive strength. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention aims to provide a preparation process of heat-resistant and crack-resistant concrete.

[0005] A preparation process of heat-resistant and crack-resistant concrete comprises the following steps:

[0006] S1: Preparation of suspension

[0007] dissolving a water reducer in deionized water to obtain a dispersion solvent, adding calcium carbonate whiskers to the dispersion solvent, and performing ultrasonic dispersion to obtain a suspension;

[0008] S2: Preparation and treatment of PVA fibers

[0009] Anatase ore and fly ash are mixed, mechanically stirred, and then ball-milled to obtain a mixed powder, the mixed powder is added to a suspension and stirred to obtain a modified solution, the modified solution, PVA, and distilled water are mixed and stirred uniformly to obtain a spinning solution, the spinning solution is added to a spinning machine, and PVA fibers are prepared by solution spinning technology through vacuum degassing, coagulation molding, hot stretching, and hot drawing molding;

[0010] S3: PVA fiber modified with VAE emulsion

[0011] A mixed solution of styrene-butadiene emulsion, boric anhydride and water is prepared, and the VAE emulsion is diluted to a VAE solution, and all of the solution is added to the mixed solution to obtain a dispersed solution. The treated PVA fiber is completely immersed in the dispersed solution, ultrasonically treated, and then placed in an oven for drying to obtain dry fiber for later use;

[0012] S4: Preparation of concrete

[0013] 5-30% by mass of aggregate, 20-60% by mass of concrete, 1-15% by mass of dry fiber and 1-5% by mass of admixture are mixed and stirred evenly to obtain heat-resistant and crack-resistant concrete.

[0014] Furthermore, step S1 of preparing the suspension comprises the following steps:

[0015] S1.1: Dissolve the water reducer in deionized water at a volume ratio of 1:(5-10) to obtain a dispersion solvent;

[0016] S1.2: Add calcium carbonate whiskers to a dispersing solvent and disperse them by ultrasonication for 15-20 minutes while mechanically stirring at 2200-2250 rpm for 15-20 minutes to obtain a suspension.

[0017] Furthermore, step S2 of preparing and treating PVA fibers comprises the following steps:

[0018] S2.1: Mix anatase ore and fly ash, mechanically stir for 2-5 minutes, and then ball mill for 25-30 minutes to obtain a mixed powder;

[0019] S2.2: Add the mixed powder to the suspension at a solid-to-liquid ratio of 1:(2-3) and mechanically stir for 5-15 minutes to obtain a modified solution;

[0020] S2.3: Mix the modified solution, PVA, and distilled water in a volume ratio of 1:1:(1-3) and stir evenly to obtain a spinning solution;

[0021] S2.4: Add the spinning solution into the spinning machine, adopt the solution spinning technology with a spinneret of 0.08mm diameter, vacuum degassing for 24h, coagulation molding with saturated Na2SO4 aqueous solution, hot stretching and hot drawing to prepare the processed PVA fiber.

[0022] Furthermore, step S3 VAE emulsion modification treatment of PVA fibers comprises the following steps:

[0023] S3.1: Prepare 350 parts by volume of a mixed solution of 50 parts by mass of styrene-butadiene emulsion, 5 parts by mass of boric anhydride, and water;

[0024] S3.2: Dilute 50 parts by mass of VAE emulsion to 400 parts by volume of VAE solution, add all of it to the mixed solution, stir evenly, and then ultrasonicate for 0.5-1 hour to obtain a dispersed solution;

[0025] S3.3: Immerse the treated PVA fibers completely in the dispersion solution and treat with ultrasound for 15-20 minutes.

[0026] S3.4: Then place it in a low-temperature oven at 25-28°C for 6-8 hours, take it out of the oven, stir it with a glass rod for 2-5 minutes, and then place it in a low-temperature oven for 40-48 hours until it is completely dried to obtain dry fiber for later use.

[0027] Furthermore, the water reducing agent in step S1.1 is a polycarboxylic acid-based high-efficiency water reducing agent.

[0028] Furthermore, in step S1.2, the solid-liquid ratio of the calcium carbonate whiskers to the dispersion solvent is 1:(2-3).

[0029] Furthermore, in step S2.1, the mass ratio of anatase ore to fly ash is 1:(2-5).

[0030] Furthermore, the frequency of the ultrasonic treatment in step S3.2 and step S3.3 is 40 kHz.

[0031] Furthermore, the aggregate in step S4 is prepared by mixing recycled construction aggregate, slag and crushed stone in a mass ratio of 1:2:3.

[0032] Furthermore, the admixture in step S4 is one or more of a water reducer, phenol, polyvinyl alcohol, acetate, glycerol and polyacrylate.

[0033] Compared with the prior art, the present invention has at least the following beneficial effects:

[0034] 1. The present invention uses calcium carbonate whiskers and a water reducer to make a suspension, and uses anatase and fly ash to treat PVA fibers. The water reducer can reduce the water demand of the material and improve the fluidity of the slurry, thereby allowing the PVA fibers and powder to be evenly mixed. The anatase powder and fly ash can be evenly distributed in the slurry and then coated on the PVA fibers. The tiny fly ash particles will attract each other, so that the treated PVA fibers can be tightly combined with each other, thereby improving the compressive and crack-resistant properties of the concrete material.

[0035] 2. The present invention modifies the treated PVA fiber by VAE emulsion. After the VAE emulsion is introduced, the emulsion will diffuse into the treated PVA fiber, smoothing the rough surface of the PVA and improving the bonding performance between the dephosphorized PVA fiber and the aggregate, thereby improving the toughness of the concrete and the heat resistance and crack prevention effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable one skilled in the relevant art to make and use the present disclosure.

[0037] Figure 1This is a flow chart of a process for preparing heat-resistant and crack-resistant concrete used in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] Example 1:

[0039] A preparation process of heat-resistant and crack-resistant concrete, such as Figure 1 As shown, the following steps are included:

[0040] S1: Preparation of suspension

[0041] S1.1: Dissolve a polycarboxylic acid-based high-efficiency water reducer in deionized water at a volume ratio of 1:5 to obtain a dispersion solvent;

[0042] S1.2: Add calcium carbonate whiskers to a dispersing solvent at a solid-to-liquid ratio of 1:2, and disperse by ultrasonication for 15 minutes while mechanically stirring at 2250 rpm for 15 minutes to obtain a suspension.

[0043] S2: Preparation and treatment of PVA fibers

[0044] S2.1: Anatase ore and fly ash were mixed in a mass ratio of 1:2, mechanically stirred for 2 minutes, and then ball milled for 30 minutes to obtain a mixed powder;

[0045] S2.2: Add the mixed powder to the suspension at a solid-liquid ratio of 1:3 and mechanically stir for 15 minutes to obtain a modified solution;

[0046] S2.3: Mix the modified solution, PVA, and distilled water in a volume ratio of 1:1:2 and stir evenly to obtain a spinning solution;

[0047] S2.4: PVA fibers were prepared by solution spinning using a spinneret with a diameter of 0.08 mm, vacuum degassing for 24 h, coagulation with a saturated Na2SO4 aqueous solution, thermal stretching, and heat drawing.

[0048] S3: PVA fiber modified with VAE emulsion

[0049] S3.1: Prepare 350 parts by volume of a mixed solution of 50 parts by mass of styrene-butadiene emulsion, 5 parts by mass of boric anhydride, and water;

[0050] S3.2: Dilute 50 parts by mass of VAE emulsion to 400 parts by volume of VAE solution, add all of it to the mixed solution, stir evenly, and then ultrasonicate at 40 kHz for 1 hour to obtain a dispersed solution;

[0051] S3.3: Immerse the treated PVA fibers completely in the dispersion solution and treat them with 40 kHz ultrasound for 20 min.

[0052] S3.4: Then place it in a low-temperature oven at 25°C for 6 hours, take it out of the oven, stir it with a glass rod for 5 minutes, and then place it in a low-temperature oven for 48 hours until it is completely dried to obtain dry fiber for later use.

[0053] S4: Preparation of concrete

[0054] 20% by mass of aggregate, 60% of concrete, 15% of dry fiber and 5% of admixture are mixed and stirred evenly. The aggregate is prepared by mixing recycled construction aggregate, slag and crushed stone in a mass ratio of 1:2:3. The admixtures are polyvinyl alcohol, glycerol and polyacrylate to obtain heat-resistant and crack-resistant concrete.

[0055] Example 2:

[0056] A preparation process of heat-resistant and crack-resistant concrete, such as Figure 1 As shown, the following steps are included:

[0057] S1: Preparation of suspension

[0058] S1.1: Dissolve the polycarboxylic acid high-efficiency water reducer in deionized water at a volume ratio of 1:5 to obtain a dispersion solvent.

[0059] S1.2: Add calcium carbonate whiskers to a dispersing solvent at a solid-to-liquid ratio of 1:2, and disperse by ultrasonication for 20 minutes while mechanically stirring at 2200 rpm for 20 minutes to obtain a suspension.

[0060] S2: Preparation and treatment of PVA fibers

[0061] S2.1: Anatase ore and fly ash were mixed in a mass ratio of 1:2, mechanically stirred for 5 minutes, and then ball milled for 25 minutes to obtain a mixed powder.

[0062] S2.2: Add the mixed powder to the suspension at a solid-liquid ratio of 1:3 and mechanically stir for 10 minutes to obtain a modified solution.

[0063] S2.3: Mix the modified solution, PVA, and distilled water in a volume ratio of 1:1:2 and stir evenly to obtain a spinning solution;

[0064] S2.4: PVA fibers were prepared by solution spinning using a spinneret with a diameter of 0.08 mm, vacuum degassing for 24 h, coagulation with a saturated Na2SO4 aqueous solution, thermal stretching, and heat drawing.

[0065] S3: PVA fiber modified with VAE emulsion

[0066] S3.1: Take 50 parts by mass of styrene-butadiene emulsion, 5 parts by mass of boric anhydride and water to prepare a mixed solution of 350 parts by volume.

[0067] S3.2: Dilute 50 parts by mass of VAE emulsion to 400 parts by volume of VAE solution, add all of it to the mixed solution, stir evenly, and then use 40kHz ultrasonic treatment for 1 hour to obtain a dispersed solution.

[0068] S3.3: The treated PVA fibers were completely immersed in the dispersion solution and treated with 40kHz ultrasound for 20min.

[0069] S3.4: Then place it in a low-temperature oven at 28°C for 8 hours, take it out of the oven, stir it with a glass rod for 5 minutes, and then place it in a low-temperature oven for 40 hours until it is completely dried to obtain dry fiber for later use.

[0070] S4: Preparation of concrete

[0071] 20% by mass of aggregate, 60% of concrete, 15% of dry fiber and 5% of admixture are mixed and stirred evenly. The aggregate is prepared by mixing recycled construction aggregate, slag and crushed stone in a mass ratio of 1:2:3. The admixtures are polyvinyl alcohol, glycerol and polyacrylate to obtain heat-resistant and crack-resistant concrete.

[0072] Example 3:

[0073] A preparation process of heat-resistant and crack-resistant concrete, such as Figure 1 As shown, the following steps are included:

[0074] S1: Preparation of suspension

[0075] S1.1: Dissolve the polycarboxylic acid high-efficiency water reducer in deionized water at a volume ratio of 1:10 to obtain a dispersion solvent.

[0076] S1.2: Add calcium carbonate whiskers to a dispersing solvent at a solid-to-liquid ratio of 1:3, and disperse by ultrasonication for 15 minutes while mechanically stirring at 2250 rpm for 15 minutes to obtain a suspension.

[0077] S2: Preparation and treatment of PVA fibers

[0078] S2.1: Anatase ore and fly ash were mixed in a mass ratio of 1:3, mechanically stirred for 2 minutes, and then ball milled for 30 minutes to obtain a mixed powder.

[0079] S2.2: Add the mixed powder to the suspension at a solid-liquid ratio of 1:1 and mechanically stir for 15 minutes to obtain a modified solution.

[0080] S2.3: Mix the modified solution, PVA, and distilled water in a volume ratio of 1:1:3 and stir evenly to obtain a spinning solution;

[0081] S2.4: PVA fibers were prepared by solution spinning using a spinneret with a diameter of 0.08 mm, vacuum degassing for 24 h, coagulation with a saturated Na2SO4 aqueous solution, thermal stretching, and heat drawing.

[0082] S3: PVA fiber modified with VAE emulsion

[0083] S3.1: Take 50 parts by mass of styrene-butadiene emulsion, 5 parts by mass of boric anhydride and water to prepare a mixed solution of 350 parts by volume.

[0084] S3.2: Dilute 50 parts by mass of VAE emulsion to 400 parts by volume of VAE solution, add all of it to the mixed solution, stir evenly, and then use 40kHz ultrasonic treatment for 1 hour to obtain a dispersed solution.

[0085] S3.3: The treated PVA fibers were completely immersed in the dispersion solution and treated with 40kHz ultrasound for 20min.

[0086] S3.4: Then place it in a low-temperature oven at 25°C for 6 hours, take it out of the oven, stir it with a glass rod for 5 minutes, and then place it in a low-temperature oven for 48 hours until it is completely dried to obtain dry fiber for later use.

[0087] S4: Preparation of concrete

[0088] 20% by mass of aggregate, 60% of concrete, 15% of dry fiber and 5% of admixture are mixed and stirred evenly. The aggregate is prepared by mixing recycled construction aggregate, slag and crushed stone in a mass ratio of 1:2:3. The admixtures are polyvinyl alcohol, glycerol and polyacrylate to obtain heat-resistant and crack-resistant concrete.

[0089] Comparative Example 1:

[0090] Compared with Example 1, Comparative Example 1 is commercially available concrete.

[0091] Comparative Example 2:

[0092] Compared with Example 1, the difference of Comparative Example 2 is that no water reducing agent is added in step S1, but a polycarboxylic acid dispersant is used, specifically: "S1.1: dissolving the polycarboxylic acid dispersant in deionized water at a volume ratio of 1:5 to obtain a dispersion solvent,

[0093] S1.2: Calcium carbonate whiskers were added to a dispersing solvent at a solid-to-liquid ratio of 1:2, and ultrasonic dispersion was performed for 15 minutes, supplemented by mechanical stirring at 2250 rpm for 15 minutes to obtain a suspension. The prepared heat-resistant and crack-resistant concrete was designated as Comparative Example 2.

[0094] Comparative Example 3

[0095] Compared with Example 1, Comparative Example 3 is different in that anatase ore is not added in step S2, but fly ash is added entirely, specifically: “S2.1: mechanically stirring the fly ash for 2 minutes, and then ball milling for 30 minutes to obtain a mixed powder;

[0096] S2.2: Add the mixed powder to the suspension at a solid-liquid ratio of 1:3 and mechanically stir for 15 minutes to obtain a modified solution;

[0097] S2.3: Mix the modified solution, PVA, and distilled water in a volume ratio of 1:1:2 and stir evenly to obtain a spinning solution;

[0098] S2.4: PVA fibers were prepared using solution spinning technology with a 0.08 mm diameter spinneret, followed by vacuum degassing for 24 h, coagulation with a saturated Na2SO4 aqueous solution, and hot stretching and heat drawing. The resulting heat-resistant and crack-resistant concrete was designated Comparative Example 3.

[0099] Comparative Example 4

[0100] Compared with Example 1, Comparative Example 4 is different in that, in step S2, fly ash is not added, but anatase ore is added entirely, specifically: “S2.1: mechanically stirring the anatase ore for 2 minutes, and then ball milling for 30 minutes to obtain a mixed powder;

[0101] S2.2: Add the mixed powder to the suspension at a solid-liquid ratio of 1:3 and mechanically stir for 15 minutes to obtain a modified solution;

[0102] S2.3: Mix the modified solution, PVA, and distilled water in a volume ratio of 1:1:2 and stir evenly to obtain a spinning solution;

[0103] S2.4: PVA fibers were prepared using solution spinning technology with a 0.08 mm diameter spinneret, followed by vacuum degassing for 24 h, coagulation with a saturated Na2SO4 aqueous solution, and hot stretching and heat drawing. The resulting heat-resistant and crack-resistant concrete was designated as Comparative Example 4.

[0104] The compressive strength of the examples and comparative examples was tested using the method in GB / T50081-2019 “Standard for Test Methods of Mechanical Properties of Concrete”, as shown in Table 1.

[0105] Table 1

[0106] Compressive strength (MPa) Example 1 49.6 Example 2 49.3 Example 3 48.7 Comparative Example 1 46.7 Comparative Example 2 41.3 Comparative Example 3 40.4 Comparative Example 4 39.1

[0107] It can be seen that Example 1 has the highest compressive strength, which is 49.6 MPa. The higher the compressive strength, the greater the pressure the concrete can withstand and the less likely it is to break.

[0108] The compressive strengths of Example 2 and Example 3 are 49.3 MPa and 48.7 MPa, respectively, while the compressive strength of the commercially available product Comparative Example 1 is 46.7 MPa, indicating that the heat-resistant and crack-resistant concrete prepared by the present invention has better compressive properties.

[0109] The compressive strength of Comparative Example 2 is 41.3 MPa, indicating that the water reducer can reduce the water demand of the material and improve the fluidity of the slurry, so that the PVA fiber and powder can be mixed evenly, and the anatase ore powder and fly ash can be evenly distributed in the slurry, thereby improving the compressive and crack-resistant properties of the concrete material.

[0110] The compressive strengths of Comparative Examples 3 and 4 are 40.4 MPa and 39.1 MPa, respectively, indicating that the treatment effect of anatase ore alone or fly ash alone on PVA fibers is not as good as the treatment effect of anatase ore and fly ash mixed on PVA fibers. This is because anatase ore powder and fly ash need to be coated on the surface of the PVA fibers, and single powders are prone to agglomeration, making it impossible to evenly coat the PVA fibers. However, the mixed powders are not easy to aggregate due to the different particle sizes, and are thus evenly coated on the surface of the PVA fibers for treatment, allowing the treated PVA fibers to be tightly bonded to each other, thereby improving the compressive and crack-resistant properties of the concrete material.

[0111] Table 2

[0112]

[0113] It can be seen that the flexural strengths of Example 1, Example 2 and Example 3 are 8.1 MPa, 7.8 MPa and 7.7 MPa respectively, while the comparative example 1 of the commercially available product is not bad, but not as high as that of the examples, at only 7.5 MPa. It can be seen that the flexural strength of the examples is higher than that of the commercially available products.

[0114] The service life of comparative example 2 is only 6.4 MPa because no water reducer is added and the slurry fluidity is poor, which makes it impossible to mix the PVA fiber and powder evenly and cannot bring benefits to the improvement of the compressive and crack resistance of the concrete material.

[0115] The service life of comparative examples 3 and 4 is 6.1 MPa and 5.8 MPa respectively, indicating that the strength of anatase or fly ash alone is not as good as the combination of the two. It can be seen that both anatase and fly ash have a certain ability to improve the anti-cracking effect of concrete.

[0116] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A process for preparing heat-resistant and crack-resistant concrete, characterized in that: The steps include: S1: Preparation of suspension dissolving a water reducer in deionized water to obtain a dispersion solvent, adding calcium carbonate whiskers to the dispersion solvent, and performing ultrasonic dispersion to obtain a suspension; S2: Preparation and treatment of PVA fibers Anatase ore and fly ash are mixed, mechanically stirred, and then ball-milled to obtain a mixed powder, the mixed powder is added to a suspension and stirred to obtain a modified solution, the modified solution, PVA, and distilled water are mixed and stirred uniformly to obtain a spinning solution, the spinning solution is added to a spinning machine, and PVA fibers are prepared by solution spinning technology through vacuum degassing, coagulation molding, hot stretching, and hot drawing molding; S3: PVA fiber modified with VAE emulsion A mixed solution of styrene-butadiene emulsion, boric anhydride and water is prepared, and the VAE emulsion is diluted to a VAE solution, and all of the solution is added to the mixed solution to obtain a dispersed solution. The treated PVA fiber is completely immersed in the dispersed solution, ultrasonically treated, and then placed in an oven for drying to obtain dry fiber for later use; S4: Preparation of concrete 5-30% by mass of aggregate, 20-60% by mass of concrete, 1-15% by mass of dry fiber and 1-5% by mass of admixture are mixed and stirred evenly to obtain heat-resistant and crack-resistant concrete.

2. The process for preparing heat-resistant and crack-resistant concrete according to claim 1, wherein: step S1 prepares a suspension, comprising the following steps: S1.1: Dissolve the water reducer in deionized water at a volume ratio of 1:(5-10) to obtain a dispersion solvent; S1.2: Add calcium carbonate whiskers to a dispersing solvent and disperse them by ultrasonication for 15-20 minutes while mechanically stirring at 2200-2250 rpm for 15-20 minutes to obtain a suspension.

3. The process for preparing heat-resistant and crack-resistant concrete according to claim 2, wherein: Step S2 prepares and processes PVA fibers, comprising the following steps: S2.1: Mix anatase ore and fly ash, mechanically stir for 2-5 minutes, and then ball mill for 25-30 minutes to obtain a mixed powder; S2.2: Add the mixed powder to the suspension at a solid-to-liquid ratio of 1:(2-3) and mechanically stir for 5-15 minutes to obtain a modified solution; S2.3: Mix the modified solution, PVA, and distilled water in a volume ratio of 1:1:(1-3) and stir evenly to obtain a spinning solution; S2.4: Add the spinning solution into the spinning machine, adopt the solution spinning technology with a spinneret of 0.08mm diameter, vacuum degassing for 24h, coagulation molding with saturated Na2SO4 aqueous solution, hot stretching and hot drawing to prepare the processed PVA fiber.

4. The process for preparing heat-resistant and crack-resistant concrete according to claim 3, characterized in that: Step S3: treating the PVA fibers with VAE emulsion modification, comprising the following steps: S3.1: Prepare 350 parts by volume of a mixed solution of 50 parts by mass of styrene-butadiene emulsion, 5 parts by mass of boric anhydride, and water; S3.2: Dilute 50 parts by mass of VAE emulsion to 400 parts by volume of VAE solution, add all of it to the mixed solution, stir evenly, and then ultrasonicate for 0.5-1 hour to obtain a dispersed solution; S3.3: Immerse the treated PVA fibers completely in the dispersion solution and treat with ultrasound for 15-20 minutes. S3.4: Then place it in a low-temperature oven at 25-28°C for 6-8 hours, take it out of the oven, stir it with a glass rod for 2-5 minutes, and then place it in a low-temperature oven for 40-48 hours until it is completely dried to obtain dry fiber for later use.

5. The process for preparing heat-resistant and crack-resistant concrete according to claim 4, characterized in that: The water reducing agent in step S1.1 is a polycarboxylic acid high-efficiency water reducing agent.

6. The process for preparing heat-resistant and crack-resistant concrete according to claim 5, characterized in that: In step S1.2, the solid-liquid ratio of the calcium carbonate whiskers to the dispersion solvent is 1:(2-3).

7. The process for preparing heat-resistant and crack-resistant concrete according to claim 6, characterized in that: The mass ratio of anatase ore to fly ash in step S2.1 is 1:(2-5).

8. The process for preparing heat-resistant and crack-resistant concrete according to claim 7, characterized in that: The frequency of the ultrasonic treatment in step S3.2 and step S3.3 was 40 kHz.

9. The process for preparing heat-resistant and crack-resistant concrete according to claim 8, characterized in that: The aggregate in step S4 is prepared by mixing recycled construction aggregate, slag and crushed stone in a mass ratio of 1:2:

3.

10. The process for preparing heat-resistant and crack-resistant concrete according to claim 9, characterized in that: The admixture in step S4 is one or more of a water reducer, phenol, polyvinyl alcohol, acetate, glycerol and polyacrylate.

Images