Corrosion-resistant and compression-resistant concrete and preparation method thereof

Abstract

The invention discloses corrosion-resistant and compression-resistant concrete and a preparation method thereof, and relates to the technical field of concrete. The concrete is specifically prepared from the following raw materials in parts by mass: 40 to 42 parts of cement, 72 to 76 parts of coarse aggregate, 30 to 34 parts of fine aggregate, 15 to 20 parts of mineral admixture, 14 to 16 parts of pure water, 4 to 5 parts of mixed fiber, 0.001 to 0.002 part of activating agent, 1.5 to 1.8 parts of water reducing agent and 0.02 to 0.03 part of early strength agent, the specific preparation method comprises the following steps: S1, uniformly mixing a part of cement, mixed fibers and an activating agent to obtain premixed cement; s2, uniformly mixing the residual cement, the coarse aggregate, the fine aggregate, the mineral admixture and the water reducing agent, adding the premixed cement, continuously stirring, adding the water and the early strength agent, and uniformly stirring to obtain the corrosion-resistant and compression-resistant concrete; the concrete provided by the invention is good in corrosion resistance and high in compressive strength.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete, and particularly to a corrosion-resistant and compressive concrete and a preparation method thereof. Background Technique

[0002] With the continuous advancement of the urbanization process in China, modern industry and urban infrastructure construction have developed rapidly, and the application demand for building materials in urban construction has also increased sharply. Due to its high compressive strength, low price, good bonding property with steel bars and other advantages, concrete is widely used in various buildings. However, affected by the material characteristics of concrete itself, in some harsh environments (such as the ocean, chemical plants, saline soil areas), concrete is easily exposed to corrosion media such as chloride ions, sulfates, and acid rain for a long time, resulting in a decline in concrete performance and facing serious corrosion problems.

[0003] In the prior art, mineral admixtures are usually added to fill the pores of concrete, refine the microstructure, reduce permeability, and thus improve corrosion resistance. However, when the addition amount is too high, the early strength development is slow and the construction period is long; for another example, epoxy coatings, silane impregnants, etc. are coated on the concrete surface to form a physical barrier, but it is easy to cause the aging and peeling of the coating due to mechanical wear, resulting in a decline in corrosion resistance; for another example, polymers such as epoxy resin and acrylic emulsion are added to the concrete to form a hydrophobic film inside to block the penetration of grafting, but the compatibility with cement hydration products is poor, there are many pores, and the corrosion resistance is average.

[0004] In summary, to solve the above problems, it is of great significance to provide a concrete with good corrosion resistance and high compressive strength. Summary of the Invention

[0005] The purpose of the present invention is to provide a corrosion-resistant and compressive concrete and a preparation method thereof to solve the problems raised in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A corrosion-resistant and compressive concrete, comprising the following raw materials, by mass: 40 - 42 parts of cement, 72 - 76 parts of coarse aggregate, 30 - 34 parts of fine aggregate, 15 - 20 parts of mineral admixture, 14 - 16 parts of pure water, 4 - 5 parts of hybrid fiber, 0.001 - 0.002 parts of activator, 1.5 - 1.8 parts of water reducer, 0.02 - 0.03 parts of early strength agent.

[0008] More preferably, the cement includes P.O42.5 composite portland cement; the coarse aggregate includes 5 - 25 mm gravel; the fine aggregate includes sand and gravel, and the fineness modulus is 2.7 - 3; the mineral admixture includes one or more of fly ash, silica fume, limestone powder, and zeolite powder.

[0009] More preferably, the activator includes 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide with a mass ratio of 1:1 to 1.5; the water reducer includes SK-A type polycarboxylate superplasticizer; the early strength agent includes triethanolamine.

[0010] More preferably, the hybrid fiber includes modified basalt fiber and carboxyl nano cellulose.

[0011] More preferably, the mass ratio of the modified basalt fiber to the carboxyl nano cellulose is 2:1 to 1.5.

[0012] More preferably, the preparation method of the modified basalt fiber includes the following steps: (1) Add basalt fiber into 10-15wt% sodium hydroxide aqueous solution and stir at 35-40°C for 1-1.5h, wash, and dry to obtain pretreated basalt fiber;

[0013] (2) Add 3-(methacryloyloxy)propyltrimethoxysilane into 70-75wt% ethanol aqueous solution and disperse evenly by ultrasonic wave, add pretreated basalt fiber, stir at 50-60°C for 4-6h, filter, wash, and dry to obtain vinylated basalt fiber;

[0014] (3) Add vinylated basalt fiber into deionized water and disperse evenly by ultrasonic wave, add acrylamide, polyethylene glycol divinyl ether, dimethylaminoethyl methacrylate, and potassium persulfate, stir at 50-60°C for 3-4h, filter, wash, and dry to obtain modified basalt fiber.

[0015] More preferably, the vinylated basalt fiber includes the following raw materials in parts by mass: 0.5-0.7 part of 3-(methacryloyloxy)propyltrimethoxysilane, 90-100 parts of 70-75wt% ethanol aqueous solution, 1-1.5 parts of pretreated basalt fiber; the modified basalt fiber includes the following raw materials in parts by mass: 2-3 parts of vinylated basalt fiber, 90-100 parts of deionized water, 1-2 parts of acrylamide, 1.4-1.6 parts of polyethylene glycol divinyl ether, 0.05-0.1 part of potassium persulfate.

[0016] More preferably, the preparation method of the corrosion-resistant and compressive concrete includes the following steps:

[0017] S1: Mix a part of cement, hybrid fiber, and activator evenly to obtain premixed cement;

[0018] S2: After mixing the remaining cement, coarse aggregate, fine aggregate, mineral admixture, and water reducer evenly, add the premixed cement, continue to stir for 10-20min, add water and early strength agent, and stir evenly to obtain corrosion-resistant and compressive concrete.

[0019] The beneficial effects of this application are as follows:

[0020] (1) The present invention provides a preparation method of corrosion-resistant and compressive concrete by means of the material ratios and addition of mixed fibers. Cement is the main binder in concrete, which reacts with water to form hydration products, endowing the concrete with certain strength and stability. The present invention selects P.O42.5 composite Portland cement, which has good early strength and late strength, and certain corrosion resistance; the coarse aggregate is 5-25 mm gravel, and the fine aggregate is sand and gravel with a fineness modulus of 2.7-3. The coarse aggregate provides the skeleton for the concrete, increasing the structural stability, and the fine aggregate is used to fill the voids between the coarse aggregates, improving the density, so as to jointly improve the performance of the concrete; on the one hand, mineral admixtures can fill the pores in the concrete, improving the density, thereby reducing the intrusion of harmful substances. On the other hand, due to the relatively smooth and dense surface of the mineral admixtures, during the mixing process of the concrete, these particles can play a lubricating and dispersing effect on the cement particles, improving the dispersion uniformity of the cement in the system, reducing the cement dosage and cost. The water reducer selected is SK-A type polycarboxylate high-performance water reducer, which helps to reduce the water consumption and water-cement ratio without increasing the cement, improving the strength and durability of the concrete; the early strength agent selected is triethanolamine, which reacts with the cement hydration products to form insoluble double salts, increasing the density of the concrete and thus improving the early strength.

[0021] (2) The present invention also adds mixed fibers to the concrete, which can form a three-dimensional network structure in the concrete, increasing the compressive strength. At the same time, it fills the tiny voids and defects in the concrete, increasing the density of the concrete and reducing the infiltration of harmful substances, thereby increasing the corrosion resistance of the concrete. The present invention selects the compound of basalt fiber and carboxyl nano-cellulose as the mixed fiber: the basalt fiber itself has excellent tensile strength and elastic modulus, and can improve the compressive strength of the concrete by bridging and blocking the crack propagation. The nano-cellulose can fill the tiny voids through its nano-scale size and high specific surface area, significantly improving the density and corrosion resistance. Moreover, the nano-cellulose has excellent hydrophilicity and water absorption. During the cement hydration process, it reduces the actual water-cement ratio, slows down the early hydration process, improves the concrete strength, and in the middle and late stages, the nano-cellulose gradually releases the absorbed water, enhancing the total hydration degree, thereby further enhancing the concrete strength.

[0022] When the amount of basalt fiber added to concrete increases, due to its poor dispersibility, it is difficult to play a strengthening role and may even reduce the performance instead. Therefore, the basalt fiber in the present invention is modified to improve its interfacial property. However, the surface of basalt fiber is smooth and has a low surface energy, and the graft modification effect using only silane coupling agent is average. Therefore, it is roughened with sodium hydroxide solution to increase the surface active sites. But after alkali treatment, the fiber performance will decrease to a certain extent, reducing the strength of concrete to a certain degree. Therefore, in the present invention, after the basalt fiber is roughened, 3-(methacryloyloxy)propyltrimethoxysilane is used to introduce alkenyl, and copolymerize with acrylamide and polyethylene glycol divinyl ether to form a continuous film on the surface of basalt fiber. On the one hand, it makes up for the strength reduction of basalt fiber due to roughening, on the other hand, it greatly improves the interfacial property, improves the dispersibility of basalt fiber in the system, and dimethylaminoethyl methacrylate is introduced. The nano-cellulose selected is carboxylated nano-cellulose, which has better dispersibility in the system compared with ordinary nano-cellulose. After mixing, it can react with the amino group in the modified basalt fiber to further form a network structure, increasing the density and the early and late strength of concrete, thus increasing the corrosion resistance and compressive strength. Detailed Embodiments

[0023] Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0024] It should be noted that there are no special restrictions on the purchase manufacturers of all raw materials involved in the present invention. Exemplarily, they include: P.O42.5 composite portland cement provided by Lin Gong Building Materials Business Department in Nanhai District, Foshan City; SK-A type polycarboxylate superplasticizer provided by Ningbo Zhongshuike Chemical Technology Co., Ltd.; early strength agent triethanolamine provided by Hubei Xianlin Chemical Co., Ltd.; basalt fiber, untwisted, with a linear density of 400 tex and a diameter of 7 μm, provided by Shanxi Basserot Co., Ltd.; the CAS number of 3-(methacryloyloxy)propyltrimethoxysilane: 2530-85-0; the CAS number of acrylamide: 79-06-1; the CAS number of polyethylene glycol divinyl ether: 50856-26-3, provided by Hubei Wande Chemical Co., Ltd.

[0025] Among them, in the following embodiments, "parts" are parts by mass, and the raw materials mentioned above and used below but not mentioned are all commercially available.

[0026] Among them, in each of the following embodiments, the concrete includes the following raw materials, by mass: 41 parts of cement, 74 parts of coarse aggregate, 32 parts of fine aggregate, 17 parts of mineral admixture, 15 parts of pure water, 4.5 parts of hybrid fiber, 0.001 part of activator, 1.6 parts of superplasticizer, 0.02 part of early strength agent.

[0027] Among them, the cement includes P.O42.5 composite portland cement; the coarse aggregate includes 5-25 mm gravel; the fine aggregate includes sand and gravel with a fineness modulus of 2.7; the mineral admixture includes fly ash and silica fume with a mass ratio of 2:1; the activator includes 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide with a mass ratio of 1:1.5; the water reducer includes SK-A type polycarboxylate superplasticizer; the early strength agent includes triethanolamine.

[0028] Example 1: The preparation method of corrosion-resistant and compressive concrete includes the following steps:

[0029] Step 1: The preparation of modified basalt fiber includes the following steps:

[0030] (1) Add basalt fiber to 10 wt% sodium hydroxide aqueous solution and stir at 35°C for 1.5 h, wash, and dry to obtain pretreated basalt fiber;

[0031] (2) Add 0.6 part of 3-(methacryloyloxy)propyltrimethoxysilane to 100 parts of 75 wt% ethanol aqueous solution, ultrasonically disperse evenly, add 1.5 parts of pretreated basalt fiber, stir at 55°C for 5 h, filter, wash, and dry to obtain vinylated basalt fiber;

[0032] (3) Add 2.5 parts of vinylated basalt fiber to 100 parts of deionized water, ultrasonically disperse evenly, add 1.8 parts of acrylamide, 1.5 parts of polyethylene glycol divinyl ether, and 0.05 part of potassium persulfate, stir at 55°C for 4 h, filter, wash, and dry to obtain modified basalt fiber;

[0033] Step 2: The preparation of concrete includes the following steps:

[0034] S1: Mix 17 parts of cement, 4.5 parts of mixed fiber, and 0.001 part of activator evenly to obtain premixed cement.

[0035] S2: After mixing 24 parts of cement, 74 parts of coarse aggregate, 32 parts of fine aggregate, 17 parts of mineral admixture, and 1.6 parts of water reducer evenly, add the premixed cement, continue to stir for 15 min, add 15 parts of pure water and 0.02 part of early strength agent, and stir evenly to obtain corrosion-resistant and compressive concrete.

[0036] Among them, the mixed fiber includes modified basalt fiber and carboxyl nanocellulose with a mass ratio of 2:1.3.

[0037] Example 2: The preparation method of corrosion-resistant and compressive concrete includes the following steps:

[0038] Step 1: The preparation of modified basalt fiber includes the following steps:

[0039] (1) Add basalt fibers to an aqueous sodium hydroxide solution of 10 wt% and stir at 35 °C for 1.5 h, wash, and dry to obtain pretreated basalt fibers;

[0040] (2) Add 0.6 part of 3-(methacryloyloxy)propyltrimethoxysilane to 100 parts of an aqueous ethanol solution of 75 wt% and ultrasonically disperse evenly. Add 1.5 parts of pretreated basalt fibers, stir at 55 °C for 5 h, filter, wash, and dry to obtain vinylated basalt fibers;

[0041] (3) Add 2.5 parts of vinylated basalt fibers to 100 parts of deionized water and ultrasonically disperse evenly. Add 1.8 parts of acrylamide, 1.5 parts of polyethylene glycol divinyl ether, and 0.05 part of potassium persulfate, stir at 55 °C for 4 h, filter, wash, and dry to obtain modified basalt fibers;

[0042] Step Two: The preparation of concrete includes the following steps:

[0043] S1: Mix 17 parts of cement, 4.5 parts of mixed fibers, and 0.001 part of activator evenly to obtain premixed cement.

[0044] S2: After mixing 24 parts of cement, 74 parts of coarse aggregate, 32 parts of fine aggregate, 17 parts of mineral admixture, and 1.6 parts of water reducer evenly, add the premixed cement, continue to stir for 15 min, add 15 parts of pure water and 0.02 part of early strength agent, and stir evenly to obtain corrosion-resistant compressive concrete.

[0045] Among them, the mixed fibers include modified basalt fibers and carboxyl nanocellulose with a mass ratio of 2:1.5.

[0046] Example 3: The preparation method of corrosion-resistant compressive concrete includes the following steps:

[0047] Step One: The preparation of modified basalt fibers includes the following steps:

[0048] (1) Add basalt fibers to an aqueous sodium hydroxide solution of 10 wt% and stir at 35 °C for 1.5 h, wash, and dry to obtain pretreated basalt fibers;

[0049] (2) Add 0.6 part of 3-(methacryloyloxy)propyltrimethoxysilane to 100 parts of an aqueous ethanol solution of 75 wt% and ultrasonically disperse evenly. Add 1.5 parts of pretreated basalt fibers, stir at 55 °C for 5 h, filter, wash, and dry to obtain vinylated basalt fibers;

[0050] (3) Add 2.5 parts of vinyl-functionalized basalt fibers to 100 parts of deionized water and disperse them evenly by ultrasonic treatment. Then add 1.8 parts of acrylamide, 1.5 parts of polyethylene glycol divinyl ether, and 0.05 parts of potassium persulfate, and stir at 55 °C for 4 h. Filter, wash, and dry to obtain modified basalt fibers;

[0051] Step two: The preparation of the concrete includes the following steps:

[0052] S1: Mix 17 parts of cement, 4.5 parts of mixed fibers, and 0.001 part of activator evenly to obtain premixed cement.

[0053] S2: After mixing 24 parts of cement, 74 parts of coarse aggregate, 32 parts of fine aggregate, 17 parts of mineral admixture, and 1.6 parts of water reducer evenly, add the premixed cement, continue to stir for 15 min, then add 15 parts of pure water and 0.02 part of early strength agent, and stir evenly to obtain corrosion-resistant and compressive concrete.

[0054] Among them, the mixed fibers include modified basalt fibers and carboxyl nanocellulose with a mass ratio of 2:1.

[0055] Comparative example 1: Based on Example 1, no mixed fibers are added, and the rest of the process remains unchanged. Specifically as follows: The preparation method of corrosion-resistant and compressive concrete includes the following steps:

[0056] Step one: The preparation of the concrete includes the following steps:

[0057] S1: Mix 17 parts of cement and 0.001 part of activator evenly to obtain premixed cement.

[0058] S2: After mixing 24 parts of cement, 74 parts of coarse aggregate, 32 parts of fine aggregate, 17 parts of mineral admixture, and 1.6 parts of water reducer evenly, add the premixed cement, continue to stir for 15 min, then add 15 parts of pure water and 0.02 part of early strength agent, and stir evenly to obtain corrosion-resistant and compressive concrete.

[0059] Comparative example 2: Based on Example 1, only modified basalt fibers are added to the mixed fibers, and the rest of the process remains unchanged. Specifically as follows: The preparation method of corrosion-resistant and compressive concrete includes the following steps:

[0060] Step one: The preparation of modified basalt fibers includes the following steps:

[0061] (1) Add basalt fibers to a 10 wt% aqueous sodium hydroxide solution and stir at 35 °C for 1.5 h. Wash and dry to obtain pretreated basalt fibers;

[0062] (2) Add 0.6 parts of 3-(methacryloyloxy)propyltrimethoxysilane to 100 parts of 75 wt% ethanol aqueous solution, ultrasonically disperse evenly, add 1.5 parts of pretreated basalt fiber, stir at 55 °C for 5 h, filter, wash, and dry to obtain vinyl-functionalized basalt fiber;

[0063] (3) Add 2.5 parts of vinyl-functionalized basalt fiber to 100 parts of deionized water, ultrasonically disperse evenly, add 1.8 parts of acrylamide, 1.5 parts of polyethylene glycol divinyl ether, and 0.05 parts of potassium persulfate, stir at 55 °C for 4 h, filter, wash, and dry to obtain modified basalt fiber;

[0064] Step two: The preparation of concrete includes the following steps:

[0065] S1: Mix 17 parts of cement, 4.5 parts of mixed fiber, and 0.001 parts of activator evenly to obtain premixed cement.

[0066] S2: After mixing 24 parts of cement, 74 parts of coarse aggregate, 32 parts of fine aggregate, 17 parts of mineral admixture, and 1.6 parts of water reducer evenly, add the premixed cement, continue to stir for 15 min, add 15 parts of pure water and 0.02 parts of early strength agent, and stir evenly to obtain corrosion-resistant compressive concrete.

[0067] Among them, the mixed fiber includes modified basalt fiber.

[0068] Comparative example 3: Based on Example 1, only carboxyl nano-cellulose is added to the mixed fiber, and the rest of the process remains unchanged. Specifically as follows: The preparation method of corrosion-resistant compressive concrete includes the following steps:

[0069] Step one: The preparation of concrete includes the following steps:

[0070] S1: Mix 17 parts of cement, 4.5 parts of mixed fiber, and 0.001 parts of activator evenly to obtain premixed cement.

[0071] S2: After mixing 24 parts of cement, 74 parts of coarse aggregate, 32 parts of fine aggregate, 17 parts of mineral admixture, and 1.6 parts of water reducer evenly, add the premixed cement, continue to stir for 15 min, add 15 parts of pure water and 0.02 parts of early strength agent, and stir evenly to obtain corrosion-resistant compressive concrete.

[0072] Among them, the mixed fiber includes carboxyl nano-cellulose.

[0073] Comparative example 4: Based on Example 1, the basalt fiber is not pretreated and directly undergoes subsequent modification, and the rest of the process remains unchanged. Specifically as follows: The preparation method of corrosion-resistant compressive concrete includes the following steps:

[0074] Step one: The preparation of modified basalt fiber includes the following steps:

[0075] (1) Add 0.6 parts of 3-(methacryloyloxy)propyltrimethoxysilane to 100 parts of 75 wt% ethanol aqueous solution, ultrasonically disperse evenly, add 1.5 parts of basalt fiber, stir at 55 °C for 5 h, filter, wash, and dry to obtain vinyl-functionalized basalt fiber;

[0076] (2) Add 2.5 parts of vinyl-functionalized basalt fiber to 100 parts of deionized water, ultrasonically disperse evenly, add 1.8 parts of acrylamide, 1.5 parts of polyethylene glycol divinyl ether, and 0.05 parts of potassium persulfate, stir at 55 °C for 4 h, filter, wash, and dry to obtain modified basalt fiber;

[0077] Step 2: The preparation of concrete includes the following steps:

[0078] S1: Mix 17 parts of cement, 4.5 parts of mixed fiber, and 0.001 parts of activator evenly to obtain premixed cement.

[0079] S2: After mixing 24 parts of cement, 74 parts of coarse aggregate, 32 parts of fine aggregate, 17 parts of mineral admixture, and 1.6 parts of water reducer evenly, add the premixed cement, continue to stir for 15 min, add 15 parts of pure water and 0.02 parts of early strength agent, and stir evenly to obtain corrosion-resistant and compressive concrete.

[0080] Among them, the mixed fiber includes modified basalt fiber and carboxyl nano-cellulose with a mass ratio of 2:1.3.

[0081] Comparative Example 5: Based on Example 1, after the basalt fiber is pretreated, no subsequent grafting is carried out, and the rest of the process remains unchanged. Specifically as follows: The preparation method of corrosion-resistant and compressive concrete includes the following steps:

[0082] Step 1: The preparation of modified basalt fiber includes the following steps:

[0083] (1) Add basalt fiber to 10 wt% sodium hydroxide aqueous solution, stir at 35 °C for 1.5 h, wash, and dry to obtain pretreated basalt fiber;

[0084] Step 2: The preparation of concrete includes the following steps:

[0085] S1: Mix 17 parts of cement, 4.5 parts of mixed fiber, and 0.001 parts of activator evenly to obtain premixed cement.

[0086] S2: After mixing 24 parts of cement, 74 parts of coarse aggregate, 32 parts of fine aggregate, 17 parts of mineral admixture, and 1.6 parts of water reducer evenly, add the premixed cement, continue to stir for 15 min, add 15 parts of pure water and 0.02 parts of early strength agent, and stir evenly to obtain corrosion-resistant and compressive concrete.

[0087] Among them, the hybrid fiber includes modified basalt fiber and carboxyl nano-cellulose with a mass ratio of 2:1.3.

[0088] Performance test: Cure the concrete of each example and comparative example for 28 days under standard curing conditions according to GB / T50080; (1) Conduct a compressive strength test on the prepared concrete according to GB / T50081, and the specimen size is 150mm×150mm×150mm; (2) Measure the chloride ion permeability of the concrete by the RCM method according to GB / T50082, and the sample size is 100mm×100mm×100mm; The experimental data are shown in Table 1.

[0089] Table 1

[0090]

[0091] Conclusion: In Comparative Example 1, no hybrid fiber is added, lacking a network structure, and both the compressive strength and chloride ion diffusion coefficient decrease significantly; in Comparative Example 2, only modified basalt fiber is added to the former hybrid fiber. Since no carboxyl nano-cellulose is added to absorb part of the water, the early hydration rate is slightly faster, the degree of cement hydration decreases, and there is a lack of microscopic structure to fill the voids, so the compressive strength is inferior to that of Example 1, and the chloride ion diffusion coefficient decreases; in Comparative Example 3, only carboxyl nano-cellulose is added to the hybrid fiber, the compressive strength decreases, lacking the support of macroscopic fiber strength, and the compressive strength decreases; in Comparative Example 4, the basalt fiber is not pretreated, the surface grafting amount is low, the subsequent modification film-forming property is low, and the compatibility becomes poor, resulting in a decrease in compressive strength; in Comparative Example 5, the basalt fiber is not subjected to subsequent grafting after pretreatment, the fiber strength decreases to a certain extent, and the subsequent non-modification leads to a decrease in interfacial property and a reduction in compressive strength.

[0092] In summary, the present invention successfully provides a concrete with good corrosion resistance and high compressive strength by adding a hybrid fiber composed of modified basalt fiber and carboxyl nano-cellulose in a specific proportion to the concrete.

[0093] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A corrosion-resistant and compression-resistant concrete, characterized in that: It includes the following raw materials, by mass parts: 40 - 42 parts of cement, 72 - 76 parts of coarse aggregate, 30 - 34 parts of fine aggregate, 15 - 20 parts of mineral admixture, 14 - 16 parts of pure water, 4 - 5 parts of hybrid fiber, 0.001 - 0.002 parts of activator, 1.5 - 1.8 parts of water reducer, 0.02 - 0.03 parts of early strength agent.

2. The corrosion-resistant and compression-resistant concrete according to claim 1, characterized in that: The cement includes P.O42.5 composite Portland cement; the coarse aggregate includes 5 - 25 mm gravel; the fine aggregate includes sand and gravel with a fineness modulus of 2.7 - 3; the mineral admixture includes one or more of fly ash, silica fume, limestone powder, and zeolite powder.

3. A corrosion-resistant and compressive concrete according to claim 1, characterized in that: The activator includes 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide with a mass ratio of 1:1 - 1.5; the water reducer includes SK-A type polycarboxylate superplasticizer; the early strength agent includes triethanolamine.

4. A corrosion-resistant and compressive concrete according to claim 1, characterized in that: The hybrid fiber includes modified basalt fiber and carboxyl nano cellulose.

5. A corrosion-resistant and compression-resistant concrete according to claim 4, wherein: The mass ratio of the modified basalt fiber to the carboxyl nano cellulose is 2:1 - 1.

5.

6. The corrosion-resistant and compressive concrete according to claim 4, wherein: The preparation method of the modified basalt fiber includes the following steps: (1) Add basalt fiber to 10 - 15 wt% sodium hydroxide aqueous solution and stir at 35 - 40 °C for 1 - 1.5 h, wash, and dry to obtain pretreated basalt fiber; (2) Add 3-(methacryloyloxy)propyltrimethoxysilane to 70 - 75 wt% ethanol aqueous solution and ultrasonically disperse evenly, add pretreated basalt fiber, stir at 50 - 60 °C for 4 - 6 h, filter, wash, and dry to obtain vinylated basalt fiber; (3) Add vinylated basalt fiber to deionized water and ultrasonically disperse evenly, add acrylamide, polyethylene glycol divinyl ether, dimethylaminoethyl methacrylate, and potassium persulfate, stir at 50 - 60 °C for 3 - 4 h, filter, wash, and dry to obtain modified basalt fiber.

7. The corrosion-resistant and compressive concrete according to claim 6, characterized in that: The vinylated basalt fiber includes the following raw materials by mass parts: 0.5 - 0.7 parts of 3-(methacryloyloxy)propyltrimethoxysilane, 90 - 100 parts of 70 - 75 wt% ethanol aqueous solution, 1 - 1.5 parts of pretreated basalt fiber; the modified basalt fiber includes the following raw materials by mass parts: 2 - 3 parts of vinylated basalt fiber, 90 - 100 parts of deionized water, 1 - 2 parts of acrylamide, 1.4 - 1.6 parts of polyethylene glycol divinyl ether, 0.05 - 0.1 parts of potassium persulfate.

8. The preparation method of a corrosion-resistant and compressive concrete according to any one of claims 1 to 7, characterized in that: It includes the following steps: S1: Mix a part of cement, hybrid fiber, and activator evenly to obtain premixed cement; S2: After mixing the remaining cement, coarse aggregate, fine aggregate, mineral admixture, and water reducer evenly, add the premixed cement, continue to stir for 10 - 20 min, add water and early strength agent, and stir evenly to obtain corrosion-resistant compressive concrete.

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