LC3 cement concrete and preparation method thereof

Abstract

The invention discloses LC3 cement concrete and a preparation method thereof, and relates to the field of cement concrete materials, the LC3 cement concrete comprises the following raw materials by weight: 70-75 parts of a cementing material, 60-65 parts of river sand, 105-115 parts of gravel, 14-16 parts of water, 5.5-6.5 parts of a polycarboxylate superplasticizer, and 6-7 parts of reinforced fibers; the cementing material comprises the following raw materials: LC3 cement, mineral powder and fly ash; the LC3 cement is prepared from the following raw materials: cement clinker, limestone, gypsum and kaolin calcined clay. According to the invention, the polycarboxylic acid water reducer with strong mud resistance is used, the mechanical strength and freezing resistance of the concrete can be improved, and the reinforced fibers with strong compatibility with other raw materials in the concrete are used, so that the LC3 cement concrete material with better comprehensive performance is obtained.

Description

Technical Field

[0001] The present invention relates to the field of cement concrete materials, and in particular to LC3 cement concrete and a preparation method thereof. Background Art

[0002] LC3 cement, also known as limestone calcined clay cement, is a new type of low-carbon cement. Composed of limestone, calcined clay, gypsum, and clinker (common cement), LC3 cement produces a carbon aluminate and calcium aluminosilicate gel (CASH gel) through a synergistic reaction between calcined clay and limestone. This optimizes pore structure and chemical stability, achieving a balance between low carbon emissions and high performance.

[0003] LC3 cement concrete is a composite material made by partially replacing ordinary cement with LC3 cement. It consists of a mixture of cementitious materials, aggregates, water, and admixtures in specific proportions. It is widely used in construction, road, and bridge engineering. The soil entrained in the sand and stone used in the aggregates contains layered montmorillonite. The polyoxyethylene side chains in the polycarboxylate superplasticizer used as an admixture easily intercalate between the montmorillonite layers, resulting in depletion of the polycarboxylate superplasticizer through chemical adsorption. This results in poor mud resistance and reduced dispersion effectiveness, necessitating increased dosage for effective dispersion.

[0004] Polypropylene fiber is commonly used to improve the mechanical properties, fatigue resistance, and durability of cement concrete. However, the low polarity of polypropylene fiber molecules leads to poor compatibility with other raw materials in LC3 cement concrete, poor adhesion to the cement matrix, and incomplete dispersion, limiting its ability to enhance the strength of LC3 cement concrete. Although polypropylene fiber is inexpensive, certain applications require high dosages to meet requirements, making its poor dispersion more pronounced.

[0005] In summary, a suitable modification method is needed to improve the mud resistance of polycarboxylate water-reducing agent, enhance the compatibility of polypropylene fiber with other raw materials in LC3 cement concrete, and enhance its adhesion to the cement matrix, so as to obtain LC3 cement concrete materials with better mechanical strength and other properties. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides an LC3 cement concrete and a preparation method thereof.

[0007] The purpose of the present invention can be achieved through the following technical solutions: An LC3 cement concrete comprises the following raw materials in parts by weight: 70-75 parts of cementitious material, 60-65 parts of river sand, 105-115 parts of crushed stone, 14-16 parts of water, 5.5-6.5 parts of polycarboxylate water reducer, and 6-7 parts of reinforcing fiber; Furthermore, the cementitious material comprises 30-40 parts of LC3 cement, 6-8 parts of mineral powder, and 6.5-7.5 parts of fly ash; Furthermore, the LC3 cement comprises 13-15 parts of cement clinker, 3.5-4.5 parts of limestone, 1.5-2 parts of gypsum, and 7-8 parts of kaolin calcined clay; Furthermore, the cement clinker is ordinary Portland cement; The preparation of the LC3 cement concrete comprises the following steps: Step S1: Mixing cement clinker, limestone, gypsum, and kaolin calcined clay to prepare LC3 cement; Step S2: mixing the cementitious material, river sand, crushed stone, and part of the reinforcing fiber to obtain a mixture; Step S3: mixing water and polycarboxylate water-reducing agent, adding the mixture, and then adding the remaining reinforcing fibers, and continuing to stir to obtain LC3 cement concrete; The preparation of the LC3 cement concrete comprises the following specific steps: Step S1: Cement clinker, limestone, gypsum, and kaolin calcined clay are mixed and stirred for 30-40 minutes to obtain LC3 cement; Step S2: LC3 cement, mineral powder, and fly ash are mixed and stirred for 35-45 minutes, river sand, gravel, and half of the reinforcing fiber are added, and stirred at a speed of 100-150 rpm for 5-10 minutes to obtain a mixture; Step S3: Mix water and polycarboxylate water reducer and stir for 20-30 minutes, add the mixture, stir at 200-300 rpm for 10-15 minutes, then add the remaining reinforcing fiber and continue stirring for 10-15 minutes to obtain LC3 cement concrete; The preparation of the polycarboxylate water-reducing agent comprises the following steps: Step M1: Mix an alcohol-containing compound, ethyl acetate, and toluene, add boron trifluoride etherate and epichlorohydrin, heat and reflux with stirring, then add potassium hydroxide solution and continue stirring to obtain product a1; Sodium sulfate, toluene, and ethanol are mixed, a protective gas is introduced, and after heating, N,N-dimethylbenzylamine is added, followed by product a1, stirring, then heating and continuing stirring to obtain product a2; Step M2, heating polyethylene glycol in a protective gas atmosphere with stirring, adding maleic anhydride, a polymerization inhibitor, and triethylamine, and heating with stirring to obtain product a3; heating product a3 in a protective gas atmosphere with stirring, adding epichlorohydrin and tetrabutylammonium chloride, and stirring to obtain product a4; Step M3: Mix product a4, methanol, and isopropanol, add product a2, sodium hydroxide, and triethylamine, and heat with stirring to obtain product a5; mix polyethylene glycol divinyl ether, polyethylene glycol diallyl ether, and deionized water to obtain mixture 1; mix acrylic acid, product a5, and deionized water to obtain mixture 2; mix mixture 1 and initiator solution, stir, add mixture 2 dropwise, and then add an auxiliary agent dropwise. After addition, stir, cool, and adjust the pH to obtain a polycarboxylate water reducer; The preparation of the polycarboxylate water-reducing agent comprises the following specific steps: Step M1: Mix and stir the alcohol-containing compound, ethyl acetate, and toluene for 15-20 minutes, add boron trifluoride etherate complex and epichlorohydrin, heat to 50-60°C, reflux and stir for 4-5 hours, then add potassium hydroxide solution and continue stirring for 3-3.5 hours to obtain product a1; mix and stir sodium sulfate, toluene, and ethanol for 10-15 minutes, introduce protective gas, heat to 45-50°C, add N,N-dimethylbenzylamine, then add product a1, stir and react for 8.5-9.5 hours, then heat to 105-115°C and stir for 1.5-2.5 hours to obtain product a2; Furthermore, the amount ratio of the alcohol-containing compound, ethyl acetate, toluene, boron trifluoride etherate complex, epichlorohydrin, and potassium hydroxide solution is 24-26 g: 25-35 mL: 35-45 mL: 3.5-4 g: 14-16 g: 40-50 mL; the alcohol-containing compound is 1-O-methylcapsidin D (also known as [2R-(2ALPHA, 4ALPHA, 4ABETA, 5ALPHA, 7BETA, 7ABETA TA)]-hexahydro-4-methoxy-7A-methyl-8-methylene-2,5-methoxycyclopenta-1,3-dioxin-7-ol); the mass fraction of the potassium hydroxide solution is 40-50%; the amount ratio of sodium sulfate salt, toluene, ethanol, N,N-dimethylbenzylamine, and product a1 is 53-55g:85-95mL:95-105mL:3-4g:34-36g; the sodium sulfate salt is deoxycholic acid-3-sulfate sodium salt; During the reaction of step M1, the hydroxyl group of the alcohol-containing compound reacts with epichlorohydrin to form a ring-opening and then ring-closing reaction to generate product a1; the carboxyl group of the sodium sulfate salt reacts with the epoxy group of product a1 to form an alcohol product containing an ester group, namely product a2; Step M2: Stirring polyethylene glycol at 75-85°C for 35-45 minutes in a protective gas atmosphere, adding maleic anhydride, a polymerization inhibitor, and triethylamine, and stirring at 85-95°C for 4.5-5 hours to obtain product a3; stirring product a3 at 40-50°C for 15-20 minutes in a protective gas atmosphere, adding epichlorohydrin and tetrabutylammonium chloride, and stirring for 5.5-6 hours to obtain product a4; Furthermore, the usage ratio of polyethylene glycol, maleic anhydride, polymerization inhibitor, and triethylamine is 50-55 g: 20-25 g: 0.06-0.08 g: 2.6-2.8 g; the polyethylene glycol is selected from one of polyethylene glycol 400, polyethylene glycol 600, and polyethylene glycol 800; the polymerization inhibitor is pyrogallol; the usage ratio of product a3, epichlorohydrin, and tetrabutylammonium chloride is 73-75 g: 15-17 g: 0.4-0.6 g; During the reaction of step M2, polyethylene glycol and maleic anhydride undergo a monoesterification reaction to obtain product a3; product a3 is ring-opened with epichlorohydrin to generate product a4 containing an alkyl chloride and an alcohol; Step M3, product a4, methanol, and isopropanol are mixed and stirred for 40-50 minutes, product a2, sodium hydroxide, and triethylamine are added, and the mixture is stirred at 45-55° C. for 4.5-5 hours to obtain product a5; polyethylene glycol divinyl ether, polyethylene glycol diallyl ether, and deionized water are mixed and stirred for 25-30 minutes to obtain mixture 1; acrylic acid, product a5, and deionized water are mixed and stirred for 30-35 minutes to obtain mixture 2; mixture 1 and initiator solution are mixed and stirred for 4-6 minutes, and mixed solution 2 is added dropwise. Mixture 2 is added dropwise within 1-1.2 hours, and then an auxiliary agent is added dropwise. The auxiliary agent is added dropwise within 1-1.2 hours. After addition, stirring is completed for 1.5-2 hours, cooling, and adjusting the pH to 6.5-7 to obtain a polycarboxylate water reducer; Furthermore, the dosage ratio of product a4, methanol, isopropanol, product a2, sodium hydroxide, and triethylamine is 84-86g: 200-210mL: 180-190mL: 90-92g: 5-7g: 2-4g; the dosage ratio of polyethylene glycol divinyl ether, polyethylene glycol diallyl ether, and deionized water in mixture 1 is 18-20g: 6-8g: 125-135mL; the dosage ratio of acrylic acid, product a5, and deionized water in mixture 2 is The dosage ratio of the mixture 1, the initiator solution, the mixed solution 2, and the auxiliary agent is 33-35g:83-85g:240-250mL; the dosage ratio of the mixture 1, the initiator solution, the mixed solution 2, and the auxiliary agent is 150-160mL:31-33mL:358-362mL:52-54mL; the initiator solution is a hydrogen peroxide solution with a mass fraction of 31-33%; the auxiliary agent is a mixture of vitamin C, thioglycolic acid, and deionized water in a dosage ratio of 5.4-6g:1.6-2g:44-50mL; During the reaction of step M3, the alkyl chloride of product a4 reacts with the hydroxyl group of product a2 to obtain product a5; polyethylene glycol divinyl ether, polyethylene glycol diallyl ether, acrylic acid, and product a5 are polymerized to obtain a polycarboxylic acid water reducer; The preparation of the reinforcing fiber comprises the following steps: Step N1, stirring and heating cyanoacrylate, acetonitrile, and ethyl acetate in a protective gas atmosphere, adding polyhydroxylamine and ferric chloride, and stirring at a constant temperature to obtain product b1; Step N2: Graphene oxide and tetrahydrofuran are mixed, oxalyl chloride and DMF are added, and the temperature is raised to reflux with stirring to obtain product b2; Product b1, 4-dimethylaminopyridine, potassium carbonate, and DMSO are mixed, a solution of product b2 is added in an ice-water bath, and the temperature is raised again, and the mixture is stirred at a constant temperature to obtain product b3; Step N3: Mix the product b3, toluene, and divinylbenzene in a protective gas atmosphere, add polypropylene fiber, continue stirring, seal, and then irradiate to obtain a reinforced fiber; The preparation of the reinforcing fiber comprises the following specific steps: Step N1: Stir cyanoacrylate, acetonitrile, and ethyl acetate in a protective gas atmosphere and heat to 60-65° C., add polyhydroxylamine and ferric chloride, and react with stirring at constant temperature for 8-8.5 hours to obtain product b1; Furthermore, the usage ratio of cyanoacrylate, acetonitrile, ethyl acetate, polyhydroxylamine, and ferric chloride is 23-25 ​​g: 25-35 mL: 75-85 mL: 22-24 g: 3.5-4 g; the cyanoacrylate is diethylene glycol monomethyl ether cyanoacrylate; the polyhydroxylamine is meglumine; During the reaction of step N1, the ester group of the cyanoacrylate reacts with the secondary amino group containing the polyhydroxylamine to obtain product b1; Step N2, graphene oxide and tetrahydrofuran were mixed and stirred for 30-40 minutes, oxalyl chloride and DMF were added, the temperature was raised to 50-60°C, and the mixture was refluxed and stirred for 12-13 hours to obtain product b2; the product b1, Mix 4-dimethylaminopyridine, potassium carbonate, and DMSO and stir for 25-35 minutes. Add the solution of product b2 in an ice-water bath, then heat to 45-50°C and stir at this temperature for 8-8.5 hours to obtain product b3. Furthermore, the amount ratio of graphene oxide, tetrahydrofuran, oxalyl chloride, and DMF is 1.5-2.5 g: 185-195 mL: 40-45 g: 1-1.5 g; the amount ratio of the solution of product b1, 4-dimethylaminopyridine, potassium carbonate, DMSO, and product b2 is 48-52 g: 2.5-3.5 g: 14-15 g: 130-140 mL: 320-360 mL; the solution of product b2 is obtained by mixing product b2 and DMSO in a ratio of 2.5-3.5 g: 300-350 mL; During the reaction of step N2, graphene oxide reacts with oxalyl chloride to obtain graphene oxide containing acyl chloride, i.e., product b2; the acyl chloride of product b2 reacts with some hydroxyl groups of product b1 to obtain product b3 containing cyano groups, hydroxyl groups, terminal carbon-carbon double bonds, graphene oxide, etc.; Step N3, mixing product b3, toluene, and divinylbenzene in a protective gas atmosphere with stirring for 20-25 minutes, adding polypropylene fiber, continuing stirring for 15-20 minutes, sealing, and irradiating under 60Co γ-rays for 10-11 hours, taking out, washing with anhydrous ethanol, extracting with acetone, and drying to obtain reinforcing fibers; Furthermore, the usage ratio of product b3, toluene, divinylbenzene, and polypropylene fiber is 11-14 g: 450-500 mL: 8-10 g: 100-104 g; During the reaction process of step N3, under the irradiation of 60Coγ-rays and the assistance of divinylbenzene, the product b3 is grafted onto the polypropylene fiber to obtain a reinforced fiber; Beneficial effects of the present invention: The present invention discloses an LC3 cement concrete and a preparation method thereof. The LC3 cement concrete is prepared from raw materials such as LC3 cement, Portland cement, polycarboxylate water reducer, and reinforcing fiber.

[0008] The polycarboxylate water reducer is obtained by reacting a product of deoxycholic acid-3-sulfate sodium salt, 1-O-methyl capsidin D, epichlorohydrin, etc. with the terminal of maleic anhydride monool ester, and then polymerizing with acrylic acid, polyethylene glycol divinyl ether, and polyethylene glycol diallyl ether. The combination of deoxycholic acid-3-sulfate sodium salt and 1-O-methylcapsidin D provides high rigidity due to the rigid skeleton, bridged ring, and dioxin structure formed by the fusion of cyclopentane and pyran rings in 1-O-methylcapsidin D, compensating for the lack of rigidity of deoxycholic acid-3-sulfate sodium salt. Furthermore, the high steric hindrance of the deoxycholic acid-3-sulfate sodium salt structure increases the insertion resistance of the polycarboxylate superplasticizer side chain into the interlayers of montmorillonite. Furthermore, the sodium sulfate in deoxycholic acid-3-sulfate sodium salt exhibits a negative charge in the LC3 cement concrete paste, creating a repulsive force with the negative charge between the montmorillonite interlayers, thereby weakening the insertion ability of the polycarboxylate superplasticizer side chain into the interlayers of montmorillonite. Consequently, the prepared polycarboxylate superplasticizer exhibits strong mud resistance, thereby enhancing the polycarboxylate superplasticizer's ability to disperse cement particles encapsulated by mud in the LC3 cement concrete paste, reducing water bleeding and enhancing the paste's cohesiveness.

[0009] The reinforcing fiber is obtained by grafting product b3, a reaction product of diethylene glycol monomethyl ether cyanoacrylate, meglumine, and graphene oxide, onto polypropylene fibers. The combined use of diethylene glycol monomethyl ether cyanoacrylate and meglumine forms polyhydroxyl and cyano groups in the reinforcing fiber, which not only increases the polarity and hydrophilicity of the reinforcing fiber, enhancing its compatibility with other raw materials in LC3 cement concrete and its adhesion to the cement matrix, but also promotes the formation of a hydrogen-bonded crosslinked network, disrupting the ordered arrangement of water and hindering the formation and expansion of ice nuclei. This also improves the density of the LC3 cement concrete, reduces porosity, and inhibits the physical space required for ice crystal growth, thereby enhancing the frost resistance of the LC3 cement concrete. Within the reinforcing fiber, graphene oxide nanosheets fill the pores of the LC3 cement concrete, further densifying the structure. These nanosheets synergistically enhance the mechanical properties of the LC3 cement concrete, compensating for the drawback that polypropylene fiber requires a high dosage to meet mechanical performance requirements. Furthermore, the dispersibility of graphene oxide and polypropylene fibers in the LC3 cement concrete slurry is significantly improved. DETAILED DESCRIPTION

[0010] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0011] Example 1 A polycarboxylate water-reducing agent, the preparation of which comprises the following steps: Step M1, 1-O-methyl capsid D, ethyl acetate, and toluene were mixed and stirred for 15 minutes, boron trifluoride ether complex and epichlorohydrin were added, the temperature was raised to 50 ° C, refluxed and stirred for 4 hours, potassium hydroxide solution was added, and stirring was continued for 3 hours to obtain product a1; deoxycholic acid-3-sulfate sodium salt, toluene, and ethanol were mixed and stirred for 10 minutes, nitrogen was introduced, the temperature was raised to 45 ° C, N, N-dimethylbenzylamine was added, and the product a1 was added, stirred and reacted for 8.5 hours, and then the temperature was raised to 105°C, stirred for 1.5 hours to obtain product a2; the dosage ratio of 1-O-methylcapsidin D, ethyl acetate, toluene, boron trifluoride etherate complex, epichlorohydrin, and potassium hydroxide solution is 24 g: 25 mL: 35 mL: 3.5 g: 14 g: 40 mL; the mass fraction of potassium hydroxide solution is 40%; the dosage ratio of deoxycholic acid-3-sulfate sodium salt, toluene, ethanol, N,N-dimethylbenzylamine, and product a1 is 53 g: 85 mL: 95 mL: 3 g: 34 g; Step M2: Polyethylene glycol 400 was stirred at 75° C. for 35 minutes under a nitrogen atmosphere, and maleic anhydride, pyrogallol, and triethylamine were added, followed by stirring at 85° C. for 4.5 hours to obtain product a3; product a3 was stirred at 40° C. for 15 minutes under a nitrogen atmosphere, and then epichlorohydrin and tetrabutylammonium chloride were added, and the mixture was stirred for 5.5 hours to obtain product a4; the amount ratio of polyethylene glycol 400, maleic anhydride, pyrogallol, and triethylamine was 50 g:20 g:0.06 g:2.6 g; the amount ratio of product a3, epichlorohydrin, and tetrabutylammonium chloride was 73 g:15 g:0.4 g; Step M3, product a4, methanol, and isopropanol were mixed and stirred for 40 minutes, product a2, sodium hydroxide, and triethylamine were added, and the mixture was stirred at 45°C for 4.5 hours to obtain product a5; polyethylene glycol divinyl ether, polyethylene glycol diallyl ether, and deionized water were mixed and stirred for 25 minutes to obtain mixture 1; acrylic acid, product a5, and deionized water were mixed and stirred for 30 minutes to obtain mixture 2; mixture 1 and initiator solution were mixed and stirred for 4 minutes, and mixed solution 2 was added dropwise, and mixed solution 2 was added dropwise within 1 hour, and then an auxiliary agent was added dropwise, and the auxiliary agent was added dropwise within 1 hour. After addition, the mixture was stirred for 1.5 hours, cooled, and the pH was adjusted to 6.6 to obtain a polycarboxylic acid water reducer; product a4, methanol, isopropanol, The dosage ratio of product a2, sodium hydroxide, and triethylamine is 84g:200mL:180mL:90g:5g:2g; the dosage ratio of polyethylene glycol divinyl ether, polyethylene glycol diallyl ether, and deionized water in mixture 1 is 18g:6g:125mL; the dosage ratio of acrylic acid, product a5, and deionized water in mixture 2 is 33g:83g:240mL; the dosage ratio of mixture 1, initiator solution, mixture 2, and auxiliary agent is 150mL:31mL:358mL:52mL; the initiator solution is a hydrogen peroxide solution with a mass fraction of 31%; the auxiliary agent is a mixture of vitamin C, thioglycolic acid, and deionized water in a dosage ratio of 5.4g:1.6g:44mL.

[0012] Example 2 A polycarboxylate water-reducing agent, the preparation of which comprises the following steps: Step M1, 1-O-methyl capsid D, ethyl acetate, and toluene were mixed and stirred for 18 minutes, boron trifluoride ether complex and epichlorohydrin were added, the temperature was raised to 55 ° C, refluxed and stirred for 4.5 hours, potassium hydroxide solution was added, and stirring was continued for 3.3 hours to obtain product a1; deoxycholic acid-3-sulfate sodium salt, toluene, and ethanol were mixed and stirred for 13 minutes, nitrogen was introduced, the temperature was raised to 48 ° C, N, N-dimethylbenzylamine was added, and the product a1 was added, stirred and reacted for 9.0 hours, and then the temperature was raised to 110°C, stirred for 2.0 h to obtain product a2; the dosage ratio of 1-O-methylcapsidin D, ethyl acetate, toluene, boron trifluoride etherate complex, epichlorohydrin, and potassium hydroxide solution is 25 g: 30 mL: 40 mL: 3.8 g: 15 g: 45 mL; the mass fraction of potassium hydroxide solution is 45%; the dosage ratio of deoxycholic acid-3-sulfate sodium salt, toluene, ethanol, N,N-dimethylbenzylamine, and product a1 is 54 g: 90 mL: 100 mL: 3.5 g: 35 g; Step M2: Polyethylene glycol 600 was stirred at 80° C. for 40 min in a nitrogen atmosphere, and maleic anhydride, pyrogallol, and triethylamine were added, followed by stirring at 90° C. for 4.8 h to obtain product a3; product a3 was stirred at 45° C. for 18 min in a nitrogen atmosphere, and epichlorohydrin and tetrabutylammonium chloride were added, and the mixture was stirred for 5.8 h to obtain product a4; the amount ratio of polyethylene glycol 600, maleic anhydride, pyrogallol, and triethylamine was 53 g:23 g:0.07 g:2.7 g; the amount ratio of product a3, epichlorohydrin, and tetrabutylammonium chloride was 74 g:16 g:0.5 g; Step M3: Product a4, methanol, and isopropanol were mixed and stirred for 45 minutes, followed by the addition of product a2, sodium hydroxide, and triethylamine, and the reaction was stirred at 50°C for 4.8 hours to obtain product a5; polyethylene glycol divinyl ether, polyethylene glycol diallyl ether, and deionized water were mixed and stirred for 28 minutes to obtain mixture 1; acrylic acid, product a5, and deionized water were mixed and stirred for 33 minutes to obtain mixture 2; mixture 1 and the initiator solution were mixed and stirred for 5 minutes, and mixture 2 was added dropwise. The addition of mixture 2 was completed within 1.1 hours, and then the auxiliary agent was added dropwise. The auxiliary agent was added dropwise within 1.1 hours. After the addition was completed, the mixture was stirred for 1.8 hours, cooled, and the pH was adjusted to 6. 7. A polycarboxylic acid water reducer is obtained; the amount ratio of product a4, methanol, isopropanol, product a2, sodium hydroxide, and triethylamine is 85 g:205 mL:185 mL:91 g:6 g:3 g; the amount ratio of polyethylene glycol divinyl ether, polyethylene glycol diallyl ether, and deionized water in mixture 1 is 19 g:7 g:130 mL; the amount ratio of acrylic acid, product a5, and deionized water in mixture 2 is 34 g:84 g:245 mL; the amount ratio of mixture 1, initiator solution, mixture 2, and auxiliary agent is 155 mL:32 mL:360 mL:53 mL; the initiator solution is a hydrogen peroxide solution with a mass fraction of 32%; The auxiliary agent is prepared by mixing vitamin C, thioglycolic acid, and deionized water in a dosage ratio of 5.7 g:1.8 g:47 mL.

[0013] Example 3 A polycarboxylate water-reducing agent, the preparation of which comprises the following steps: Step M1, 1-O-methyl capsid D, ethyl acetate, and toluene were mixed and stirred for 20 minutes, boron trifluoride ether complex and epichlorohydrin were added, the temperature was raised to 60 ° C, refluxed and stirred for 5 hours, potassium hydroxide solution was added, and stirring was continued for 3.5 hours to obtain product a1; deoxycholic acid-3-sulfate sodium salt, toluene, and ethanol were mixed and stirred for 15 minutes, nitrogen was introduced, the temperature was raised to 50 ° C, N, N-dimethylbenzylamine was added, and then product a1 was added, stirred and reacted for 9.5 hours, and then heated The mixture was heated to 115°C and stirred for 2.5 hours to obtain product a2. The dosage ratio of 1-O-methylcapsidin D, ethyl acetate, toluene, boron trifluoride etherate complex, epichlorohydrin, and potassium hydroxide solution was 26 g: 35 mL: 45 mL: 4 g: 16 g: 50 mL; the mass fraction of the potassium hydroxide solution was 50%; the dosage ratio of deoxycholic acid-3-sulfate sodium salt, toluene, ethanol, N,N-dimethylbenzylamine, and product a1 was 55 g: 95 mL: 105 mL: 4 g: 36 g. Step M2: Polyethylene glycol 800 was stirred at 85° C. for 45 minutes under a nitrogen atmosphere, and maleic anhydride, pyrogallol, and triethylamine were added, followed by stirring at 95° C. for 5 hours to obtain product a3; epichlorohydrin and tetrabutylammonium chloride were added to product a3 under a nitrogen atmosphere at 50° C. for 20 minutes, and the mixture was stirred for 6 hours to obtain product a4; the amount ratio of polyethylene glycol 800, maleic anhydride, pyrogallol, and triethylamine was 55 g:25 g:0.08 g:2.8 g; the amount ratio of product a3, epichlorohydrin, and tetrabutylammonium chloride was 75 g:17 g:0.6 g; Step M3: Mix product a4, methanol, and isopropanol and stir for 50 minutes, add product a2, sodium hydroxide, and triethylamine, and stir and react at 55° C. for 5 hours to obtain product a5; mix polyethylene glycol divinyl ether, polyethylene glycol diallyl ether, and deionized water and stir for 30 minutes to obtain mixture 1; Acrylic acid, product a5 and deionized water were mixed and stirred for 35 minutes to obtain mixture 2; mixture 1 and initiator solution were mixed and stirred for 6 minutes, and mixture 2 was added dropwise, and the addition of mixture 2 was completed within 1.2 hours, and then an auxiliary agent was added dropwise, and the addition of the auxiliary agent was completed within 1.2 hours. After the addition was completed, the mixture was stirred for 2 hours, cooled and the pH was adjusted to 6.9 to obtain a polycarboxylic acid water reducer; the amount ratio of product a4, methanol, isopropanol, product a2, sodium hydroxide and triethylamine was 86g:210mL:190mL:92g:7g:4g; the polycarboxylic acid in mixture 1 was 0.1g: ... The dosage ratio of ethylene glycol divinyl ether, polyethylene glycol diallyl ether, and deionized water is 20 g:8 g:135 mL; the dosage ratio of acrylic acid, product a5, and deionized water in mixture 2 is 35 g:85 g:250 mL; the dosage ratio of mixture 1, initiator solution, mixed solution 2, and auxiliary agent is 160 mL:33 mL:362 mL:54 mL; the initiator solution is a hydrogen peroxide solution with a mass fraction of 33%; the auxiliary agent is a mixture of vitamin C, thioglycolic acid, and deionized water in a dosage ratio of 6 g:2 g:50 mL.

[0014] Example 4 A reinforcing fiber, the preparation of which comprises the following steps: Step N1: diethylene glycol monomethyl ether cyanoacrylate, acetonitrile, and ethyl acetate were stirred and heated to 60° C. in a nitrogen atmosphere. Meglumine and ferric chloride were added, and the mixture was stirred at this constant temperature for 8 hours to obtain product b1. The ratio of diethylene glycol monomethyl ether cyanoacrylate, acetonitrile, ethyl acetate, polyhydroxyamine, and ferric chloride was 23 g:25 mL:75 mL:22 g:3.5 g. Step N2, graphene oxide and tetrahydrofuran were mixed and stirred for 30 minutes, oxalyl chloride and DMF were added, the temperature was raised to 50°C, and the mixture was refluxed and stirred for 12 hours to obtain product b2; product b1, 4-dimethylaminopyridine, potassium carbonate, and DMSO were mixed and stirred for 25 minutes, a solution of product b2 was added in an ice-water bath, the temperature was raised to 45°C, and the mixture was stirred at a constant temperature for 8 hours to obtain product b3; the amount ratio of graphene oxide, tetrahydrofuran, oxalyl chloride, and DMF was 1.5g:185mL:40g:1g; the amount ratio of product b1, 4-dimethylaminopyridine, potassium carbonate, DMSO, and the solution of product b2 was 48g:2.5g:14g:130mL:320mL; the solution of product b2 was obtained by mixing product b2 and DMSO in an amount ratio of 2.5g:300mL; Step N3: Mix product b3, toluene, and divinylbenzene in a nitrogen atmosphere and stir for 20 minutes, add polypropylene fiber, continue stirring for 15 minutes, seal and irradiate under 60Coγ rays for 10 hours, take out and wash with anhydrous ethanol, extract with acetone, and dry to obtain reinforced fiber; the dosage ratio of product b3, toluene, divinylbenzene, and polypropylene fiber is 11g:450mL:8g:100g.

[0015] Example 5 A reinforcing fiber, the preparation of which comprises the following steps: Step N1: diethylene glycol monomethyl ether cyanoacrylate, acetonitrile, and ethyl acetate were stirred and heated to 63° C. in a nitrogen atmosphere. Meglumine and ferric chloride were added, and the mixture was stirred at this constant temperature for 8.3 hours to obtain product b1. The ratio of diethylene glycol monomethyl ether cyanoacrylate, acetonitrile, ethyl acetate, polyhydroxyamine, and ferric chloride was 24 g:30 mL:80 mL:23 g:3.7 g. Step N2, graphene oxide and tetrahydrofuran were mixed and stirred for 35 minutes, oxalyl chloride and DMF were added, the temperature was raised to 55°C, and the mixture was refluxed and stirred for 12.5 hours to obtain product b2; product b1, 4-dimethylaminopyridine, potassium carbonate, and DMSO were mixed and stirred for 30 minutes, a solution of product b2 was added in an ice-water bath, the temperature was raised to 48°C, and the mixture was stirred at a constant temperature for 8.3 hours to obtain product b3; the amount ratio of graphene oxide, tetrahydrofuran, oxalyl chloride, and DMF was 2.0 g:190 mL:43 g:1.3 g; the amount ratio of product b1, 4-dimethylaminopyridine, potassium carbonate, DMSO, and the solution of product b2 was 50 g:3.0 g:14.5 g:135 mL:340 mL; the solution of product b2 was obtained by mixing product b2 and DMSO in an amount ratio of 3.0 g:325 mL; Step N3: Mix product b3, toluene, and divinylbenzene in a nitrogen atmosphere and stir for 23 minutes, add polypropylene fiber, continue stirring for 18 minutes, seal and irradiate under 60Coγ rays for 10.5 hours, take out and wash with anhydrous ethanol, extract with acetone, and dry to obtain reinforced fiber; the dosage ratio of product b3, toluene, divinylbenzene, and polypropylene fiber is 12.5g:475mL:9g:102g.

[0016] Example 6 A reinforcing fiber, the preparation of which comprises the following steps: Step N1: diethylene glycol monomethyl ether cyanoacrylate, acetonitrile, and ethyl acetate were stirred and heated to 65°C under a nitrogen atmosphere. Meglumine and ferric chloride were added, and the mixture was stirred at this constant temperature for 8.5 hours to obtain product b1. The ratio of diethylene glycol monomethyl ether cyanoacrylate, acetonitrile, ethyl acetate, polyhydroxyamine, and ferric chloride was 25 g:35 mL:85 mL:24 g:4 g. Step N2, graphene oxide and tetrahydrofuran were mixed and stirred for 40 minutes, oxalyl chloride and DMF were added, the temperature was raised to 60°C, and the mixture was refluxed and stirred for 13 hours to obtain product b2; product b1, 4-dimethylaminopyridine, potassium carbonate, and DMSO were mixed and stirred for 35 minutes, a solution of product b2 was added in an ice-water bath, the temperature was raised to 50°C, and the mixture was stirred at a constant temperature for 8.5 hours to obtain product b3; the amount ratio of graphene oxide, tetrahydrofuran, oxalyl chloride, and DMF was 2.5g:195mL:45g:1.5g; the amount ratio of product b1, 4-dimethylaminopyridine, potassium carbonate, DMSO, and the solution of product b2 was 52g:3.5g:15g:140mL:360mL; the solution of product b2 was obtained by mixing product b2 and DMSO in an amount ratio of 3.5g:350mL; Step N3: Mix product b3, toluene, and divinylbenzene in a nitrogen atmosphere and stir for 25 minutes, add polypropylene fiber, continue stirring for 20 minutes, seal and irradiate under 60Coγ rays for 11 hours, take out and wash with anhydrous ethanol, extract with acetone, and dry to obtain reinforced fiber; the dosage ratio of product b3, toluene, divinylbenzene, and polypropylene fiber is 14g:500mL:10g:104g.

[0017] Example 7 An LC3 cement concrete comprises the following raw materials in parts by weight: 70 parts cementitious material, 60 parts river sand, 105 parts crushed stone, 14 parts water, 5.5 parts polycarboxylate water reducer, and 6 parts reinforcing fiber; the cementitious material comprises 30 parts LC3 cement, 6 parts mineral powder, and 6.5 parts fly ash; the LC3 cement comprises 13 parts cement clinker, 3.5 parts limestone, 1.5 parts gypsum, and 7 parts calcined kaolin clay; the cement clinker is ordinary Portland cement (supplier: Tangshan Aocheng Cement Co., Ltd. Shengxin Branch); The preparation of the LC3 cement concrete comprises the following steps: Step S1: Cement clinker, limestone (supplier: Lingshou County Defa Mineral Products Processing Plant), gypsum (supplier: Chongqing Danyou Materials Co., Ltd.), and kaolin calcined clay (supplier: Hebei Huishun Mining Co., Ltd., 325 mesh) were mixed and stirred for 30 minutes to obtain LC3 cement; Step S2: LC3 cement, mineral powder (supplier: Shijiazhuang Mayue Building Materials Co., Ltd., grade S95), and fly ash (supplier: Hebei McMahon Mineral Products Co., Ltd.) were mixed and stirred for 35 minutes, and river sand (supplier: Lingshou County Haibin Mineral Products Trading Co., Ltd., fine-mesh sand), crushed stone (supplier: Lingshou County Zhongyan Building Materials Factory), and half of the reinforcing fiber obtained in Example 4 were added and stirred at a speed of 100 rpm for 5 minutes to obtain a mixture; Step S3: water and the polycarboxylate water-reducing agent obtained in Example 1 were mixed and stirred for 20 minutes, and then added to the mixture. The mixture was stirred at a speed of 200 rpm for 10 minutes, and the remaining reinforcing fibers obtained in Example 4 were added. The mixture was stirred for another 10 minutes to obtain LC3 cement concrete.

[0018] Example 8 An LC3 cement concrete comprises the following raw materials, in parts by weight: 73 parts cementitious material, 63 parts river sand, 110 parts crushed stone, 15 parts water, 6.0 parts polycarboxylate water-reducing agent, and 6.5 parts reinforcing fiber; the cementitious material comprises 35 parts LC3 cement, 7 parts mineral powder, and 7.0 parts fly ash; the LC3 cement comprises 14 parts cement clinker, 4.0 parts limestone, 1.8 parts gypsum, and 7.5 parts calcined kaolin clay; the cement clinker is ordinary Portland cement (supplier: Tangshan Aocheng Cement Co., Ltd. Shengxin Branch); The preparation of the LC3 cement concrete comprises the following steps: Step S1: Cement clinker, limestone (supplier: Lingshou County Defa Mineral Products Processing Plant), gypsum (supplier: Chongqing Danyou Materials Co., Ltd.), and kaolin calcined clay (supplier: Hebei Huishun Mining Co., Ltd., 325 mesh) were mixed and stirred for 35 minutes to obtain LC3 cement; Step S2: LC3 cement, mineral powder (supplier: Shijiazhuang Mayue Building Materials Co., Ltd., grade S95), and fly ash (supplier: Hebei McMeni Mineral Products Co., Ltd.) were mixed and stirred for 40 minutes, and river sand (supplier: Lingshou County Haibin Mineral Products Trading Co., Ltd., fine-mesh sand), crushed stone (supplier: Lingshou County Zhongyan Building Materials Factory), and half of the reinforcing fiber obtained in Example 5 were added and stirred at a speed of 100 rpm for 8 minutes to obtain a mixture; Step S3: water and the polycarboxylate water-reducing agent obtained in Example 2 were mixed and stirred for 25 minutes, added to the mixture, and stirred at a speed of 200 rpm for 13 minutes. The remaining reinforcing fibers obtained in Example 5 were then added and stirred for another 13 minutes to obtain LC3 cement concrete.

[0019] Example 9 An LC3 cement concrete comprises the following raw materials in parts by weight: 75 parts of cementitious material, 65 parts of river sand, 115 parts of crushed stone, 16 parts of water, 6.5 parts of polycarboxylate water-reducing agent, and 7 parts of reinforcing fiber; the cementitious material comprises 40 parts of LC3 cement, 8 parts of mineral powder, and 7.5 parts of fly ash; the LC3 cement comprises 15 parts of cement clinker, 4.5 parts of limestone, 2 parts of gypsum, and 8 parts of calcined kaolin clay; the cement clinker is ordinary Portland cement (supplier: Tangshan Aocheng Cement Co., Ltd. Shengxin Branch); The preparation of the LC3 cement concrete comprises the following steps: Step S1: Cement clinker, limestone (supplier: Lingshou County Defa Mineral Products Processing Plant), gypsum (supplier: Chongqing Danyou Materials Co., Ltd.), and kaolin calcined clay (supplier: Hebei Huishun Mining Co., Ltd., 325 mesh) were mixed and stirred for 40 minutes to obtain LC3 cement; Step S2: LC3 cement, mineral powder (supplier: Shijiazhuang Mayue Building Materials Co., Ltd., grade S95), and fly ash (supplier: Hebei McMahon Mineral Products Co., Ltd.) were mixed and stirred for 45 minutes, and river sand (supplier: Lingshou County Haibin Mineral Products Trading Co., Ltd., fine-mesh sand), crushed stone (supplier: Lingshou County Zhongyan Building Materials Factory), and half of the reinforcing fiber obtained in Example 6 were added and stirred at a speed of 100 rpm for 10 minutes to obtain a mixture; Step S3: water and the polycarboxylate water-reducing agent obtained in Example 3 were mixed and stirred for 30 minutes, added to the mixture, and stirred at a speed of 300 rpm for 15 minutes. The remaining reinforcing fibers obtained in Example 6 were then added and stirred for another 15 minutes to obtain LC3 cement concrete.

[0020] Comparative Example 1 Compared with Example 9, the deoxycholic acid-3-sulfate sodium salt used in the preparation of the polycarboxylate water-reducing agent was replaced with flavonol-2-sulfonic acid sodium salt, and the product a2-1 obtained by the reaction of flavonol-2-sulfonic acid sodium salt with product a1 participated in the subsequent reaction. The rest of the reaction was exactly the same as in Example 9 to produce LC3 cement concrete; Reaction process of flavonol-2-sulfonic acid sodium salt and product a1: Product a1, flavonol-2-sulfonic acid sodium salt, toluene, and methanol were mixed and stirred for 20 minutes, triethylamine was added, and refluxed at 90°C with stirring for 7 hours to obtain product a2-1; the usage ratio of product a1, flavonol-2-sulfonic acid sodium salt, toluene, methanol, and triethylamine was 36g:35g:90mL:70mL:2.0g.

[0021] Comparative Example 2 Compared with Example 9, LC3 cement concrete was prepared by replacing 1-O-methylcapsidin D in the preparation process of the polycarboxylate water-reducing agent with 5-methoxy-2,3-dihydrobenzo[B][1,4]dioxin-6-ol. The rest of the steps were the same as in Example 9.

[0022] Comparative Example 3 Compared with Example 9, LC3 cement concrete was prepared by replacing meglumine in the process of preparing the reinforcing fiber with 2-piperidineethanol and remaining the same as in Example 9.

[0023] Comparative Example 4 Compared with Example 9, LC3 cement concrete was prepared by replacing diethylene glycol monomethyl ether cyanoacrylate in the preparation process of the reinforcing fiber with isobutyl methacrylate, and the rest of the process was the same as Example 9.

[0024] Comparative Example 5 Compared with Example 9, the graphene oxide in the preparation process of the reinforcing fiber was replaced with butyric acid to prepare reinforcing fiber-1, and the reinforcing fiber-1 and graphene oxide were added in a mass ratio of 7.5:1 to prepare LC3 cement concrete.

[0025] The LC3 cement concrete prepared by the present invention was further tested for its effectiveness, and the test results are as follows.

[0026] Bleeding rate: The LC3 cement concrete was tested for bleeding rate according to GB / T50080-2016 "Standard for Test Methods of Performance of Ordinary Concrete Mixtures" to evaluate the effect of the anti-mud property of the polycarboxylate superplasticizer on the performance of the concrete. Strength: The 28-day compressive strength of the obtained LC3 cement concrete was tested with reference to GB / T17671-2021 "Test method for strength of cement mortar (ISO method)" to evaluate the mechanical properties of the obtained LC3 cement concrete; Frost resistance: With reference to GB / T50082-2024 "Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete", the obtained concrete was subjected to a frost resistance test. The freeze-thaw compressive strength of the concrete specimens after 28 days of standard curing and 60 freeze-thaw cycles was measured to characterize the frost resistance; The results are recorded in Table 1; Table 1: Test results

[0027] According to the data in Table 1, the LC3 cement concrete of the present invention has a low water bleeding rate, strong mechanical strength, and frost resistance. Comparing Example 9 with Comparative Example 1 shows that replacing deoxycholic acid-3-sulfate sodium salt in the preparation of the polycarboxylate water-reducer with flavonol-2-sulfonic acid sodium salt, and participating in the subsequent reaction of product a2-1 obtained by the reaction of flavonol-2-sulfonic acid sodium salt with product a1, the resulting polycarboxylate water-reducer has a reduced anti-mud performance, an increased water bleeding rate, and a slightly decreased mechanical strength of the resulting LC3 cement concrete. Comparing Example 9 with Comparative Example 2 shows that replacing 1-O-methylcapsidin D in the preparation of the polycarboxylate water-reducer with 5-methoxy-2,3-dihydrobenzo[B][1,4]dioxin-6-ol, the resulting polycarboxylate water-reducer has a reduced anti-mud performance, an increased water bleeding rate, and a slightly decreased mechanical strength of the resulting LC3 cement concrete. Comparing Example 9 with Comparative Example 3, it can be seen that replacing meglumine in the preparation of the reinforcing fiber with 2-piperidineethanol reduces its ability to promote the formation of a hydrogen-bonded cross-linked network, disrupt the ordered water structure, and hinder the formation and expansion of ice nuclei, resulting in reduced frost resistance in the resulting LC3 cement concrete. Comparing Example 9 with Comparative Example 4, it can be seen that replacing diethylene glycol monomethyl ether cyanoacrylate with isobutyl methacrylate in the preparation of the reinforcing fiber reduces the frost resistance of the resulting LC3 cement concrete. Comparing Example 9 with Comparative Example 5, it can be seen that replacing graphene oxide in the preparation of the reinforcing fiber with butyric acid to produce Reinforcing Fiber-1, and simultaneously adding Reinforcing Fiber-1 and graphene oxide in a proportional manner, results in reduced mechanical strength and somewhat reduced frost resistance in the resulting LC3 cement concrete.

[0028] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. An LC3 cement concrete, characterized by: The raw materials include the following parts by weight: 70-75 parts of cementitious material, 60-65 parts of river sand, 105-115 parts of crushed stone, 14-16 parts of water, 5.5-6.5 parts of polycarboxylate water reducer, and 6-7 parts of reinforcing fiber; The preparation of the polycarboxylate water-reducing agent comprises the following steps: Step M1: Mix an alcohol-containing compound, ethyl acetate, and toluene, add boron trifluoride etherate and epichlorohydrin, heat and reflux with stirring, then add potassium hydroxide solution and continue stirring to obtain product a1; Sodium sulfate, toluene, and ethanol are mixed, a protective gas is introduced, and after heating, N,N-dimethylbenzylamine is added, followed by product a1, stirring, then heating and continuing stirring to obtain product a2; Step M2, heating polyethylene glycol in a protective gas atmosphere with stirring, adding maleic anhydride, a polymerization inhibitor, and triethylamine, and heating with stirring to obtain product a3; heating product a3 in a protective gas atmosphere with stirring, adding epichlorohydrin and tetrabutylammonium chloride, and stirring to obtain product a4; Step M3: Mix product a4, methanol, and isopropanol, add product a2, sodium hydroxide, and triethylamine, and heat with stirring to obtain product a5; mix polyethylene glycol divinyl ether, polyethylene glycol diallyl ether, and deionized water to obtain mixture 1; mix acrylic acid, product a5, and deionized water to obtain mixture 2; mix mixture 1 and initiator solution, stir, add mixture 2 dropwise, and then add an auxiliary agent dropwise. After addition, stir, cool, and adjust the pH to obtain a polycarboxylate water reducer.

2. The LC3 cement concrete according to claim 1, wherein: The cementitious material includes 30-40 parts of LC3 cement, 6-8 parts of mineral powder, and 6.5-7.5 parts of fly ash.

3. The LC3 cement concrete according to claim 2, wherein: The LC3 cement comprises 13-15 parts of cement clinker, 3.5-4.5 parts of limestone, 1.5-2 parts of gypsum, and 7-8 parts of kaolin calcined clay.

4. The LC3 cement concrete according to claim 1, wherein: In step M1, the alcohol-containing compound is 1-O-methylcapsidin D; and the sodium sulfate salt is deoxycholic acid-3-sulfate sodium salt.

5. The LC3 cement concrete according to claim 1, characterized in that: In step M3, the auxiliary agent is obtained by mixing vitamin C, thioglycolic acid, and deionized water in a dosage ratio of 5.4-6 g: 1.6-2 g: 44-50 mL.

6. The LC3 cement concrete according to claim 1, characterized in that: The preparation of the reinforcing fiber comprises the following steps: Step N1, stirring and heating cyanoacrylate, acetonitrile, and ethyl acetate in a protective gas atmosphere, adding polyhydroxylamine and ferric chloride, and stirring at a constant temperature to obtain product b1; Step N2: Graphene oxide and tetrahydrofuran are mixed, oxalyl chloride and DMF are added, and the temperature is raised to reflux with stirring to obtain product b2; Product b1, 4-dimethylaminopyridine, potassium carbonate, and DMSO are mixed, a solution of product b2 is added in an ice-water bath, the temperature is raised again, and the temperature is stirred at a constant temperature to obtain product b3; Step N3: Product b3, toluene, and divinylbenzene are mixed in a protective gas atmosphere, polypropylene fiber is added, stirring is continued, and the mixture is sealed and irradiated to obtain reinforced fiber.

7. The LC3 cement concrete according to claim 6, characterized in that: In step N1, the cyanoacrylate is diethylene glycol monomethyl ether cyanoacrylate; and the polyhydroxyamine is meglumine.

8. The LC3 cement concrete according to claim 6, characterized in that: In step N2, the solution of product b2 is obtained by mixing product b2 and DMSO in a ratio of 2.5-3.5 g: 300-350 mL.

9. A method for preparing the LC3 cement concrete according to any one of claims 1 to 8, characterized in that: The steps include: The cementitious material, river sand, crushed stone and part of the reinforcing fiber are mixed and stirred to obtain a mixture; water and a polycarboxylate water reducer are mixed and added to the mixture, and the remaining reinforcing fiber is added and stirred continuously to obtain LC3 cement concrete.

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