Basalt fiber reinforced cement-based composite material and preparation method thereof

Abstract

The invention relates to the technical field of cement-based composite materials, in particular to a basalt fiber reinforced cement-based composite material and a preparation method thereof. The basalt fiber reinforced cement-based composite material is prepared from the following raw materials in parts by weight: 300 to 400 parts of fine aggregate, 200 to 300 parts of sulphoaluminate cement, 80 to 120 parts of water, 40 to 60 parts of filler, 30 to 40 parts of powder, 30 to 40 parts of silica fume and 1 to 3 parts of water reducing agent. According to the preparation method, nano-cellulose is prepared after corbicula fluminea is treated, the nano-cellulose can be filled in the material to play a role in enhancing toughness, and meanwhile, the porosity of a material interface transition area can be reduced by mixing and adding the phytic acid modified starch and utilizing the complexing effect of phosphate groups of the phytic acid modified starch; further, all the component materials are combined more uniformly, stress transfer among all the component materials is smoother, and the effect of improving the strength performance of the cement-based composite material is achieved.

Description

Technical Field

[0001] This invention relates to the field of cement-based composite materials technology, specifically to a basalt fiber reinforced cement-based composite material and its preparation method. Background Technology

[0002] Cement-based composite materials are multiphase composite materials made by using cement as a binder and adding aggregates and functional components. They are widely used in building structures, roads and bridges, water conservancy projects and other fields, and are one of the core materials of modern civil engineering.

[0003] In existing technologies, high-hardness aggregates are typically added during the preparation of cement-based composite materials to improve their strength. However, the addition of multiple components can hinder stress transmission between different materials, resulting in uneven stress distribution throughout the cement-based composite material and affecting its strength performance. Therefore, this invention provides a basalt fiber-reinforced cement-based composite material and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide a basalt fiber reinforced cement-based composite material and its preparation method. The cement-based composite material prepared by this invention not only has good compressive strength but also excellent flexural strength, effectively improving the performance of the cement-based composite material.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a basalt fiber reinforced cement-based composite material, comprising the following raw materials in parts by weight: 300-400 parts fine aggregate, 200-300 parts sulfoaluminate cement, 80-120 parts water, 40-60 parts filler, 30-40 parts powder, 30-40 parts silica fume, and 1-3 parts water-reducing agent.

[0007] The preparation of the filler includes the following steps:

[0008] S1: Base material preparation, wherein the raw material for the base material is basalt fiber, and the base material is obtained after the basalt fiber is processed;

[0009] S2: Preparation of additives, wherein the raw material for the additives is wood clam, and after the wood clam is pretreated, it is further processed to obtain the additives;

[0010] S3: Mixing treatment, the base material and additives are mixed to obtain a mixture;

[0011] S4: Preparation process, further processing of the mixture to obtain the filler.

[0012] Further, the method for preparing the base material is as follows: basalt fibers are added to a mixer, KH550, anhydrous ethanol, and deionized water are added to the mixer, the mixer is set to 200-300 r / min and stirred for 20-30 min, the resulting product is washed, and then sent to an oven, the oven is set to 60-80℃ and dried for 10-12 h to obtain the base material, wherein the mass ratio of KH550, anhydrous ethanol, and deionized water is 1:(20-30):(250-300), and the mass of deionized water is 60-80% of the basalt fibers.

[0013] Furthermore, the pretreatment method for the clam wood is as follows: the clam wood is selected from the scraps of the clam wood processing plant. After the clam wood is recycled, it is ground. The grinding particle size is 200-300μm. The ground product is cleaned and then sent to an oven. The oven is set to 50-60℃ and dried for 6-8 hours to complete the pretreatment of the clam wood.

[0014] Further, the method for preparing the additive is as follows: the pretreated wood chips are added to a mixer, sodium hydroxide, urea, and deionized water are added to the mixer, the mixer is set to 300-400 r / min and stirred for 30-40 min, the resulting product is subjected to freezing treatment at a temperature of (-15)-(-25)℃ for 4-6 h, after freezing treatment is completed, it is placed in a room temperature environment to thaw for 1-2 h, and the freezing and thawing treatment is repeated 3-5 times, the resulting product is sent to a high-pressure homogenizer, the high-pressure homogenizer is set to 100-200 MPa and the treatment time is 6-10 min to obtain a slurry, the slurry is further processed to obtain the additive, wherein the mass ratio of sodium hydroxide, urea, and deionized water is 1:(2-4):(40-60), and the mass of deionized water is 2-4 times the mass of the pretreated wood chips.

[0015] Further, the mixing process is as follows: the slurry is treated by adding the slurry and carboxymethyl chitosan to a reaction vessel, setting the temperature of the reaction vessel to 45-55°C, the rotation speed to 400-600 r / min, and stirring at a constant temperature for 20-30 min. Then, a polyethyleneimine solution is added to the reaction vessel, and the mixture is stirred at 200-300 r / min for 10-20 min at room temperature. The resulting product is added to a shear emulsifier and treated at 10000-12000 r / min for 30-40 min to obtain an additive. The mass of carboxymethyl chitosan is 6-8% of the slurry mass, the mass concentration of the polyethyleneimine solution is 2%, and the mass of the polyethyleneimine solution is 3-5% of the slurry mass.

[0016] Further, the mixing process is as follows: the base material, additives, phytic acid modified starch, and water are added to a mixer, the mixer is set to 400-600 r / min and stirred for 50-60 min, the resulting product is sent to an oven and dried at 60-70℃ for 10-20 min to complete the mixing process and obtain a mixture.

[0017] Furthermore, the mass ratio of the base material, additives, phytic acid modified starch, and water is 1:(0.5-0.6):(0.1-0.2):(0.2-0.4).

[0018] Further, the preparation method is as follows: the mixture, sucrose powder, maleic anhydride, and graphene dispersion are added to a reaction vessel, the reaction vessel is set to be heated to 40-50°C, the rotation speed is 400-600 r / min, and the mixture is stirred at a constant temperature for 20-30 min to obtain the filler. The mass ratio of the mixture, sucrose powder, maleic anhydride, and graphene dispersion is 1:(0.06-0.08):(0.05-0.07):(0.06-0.08).

[0019] Furthermore, the fine aggregate is selected from river sand, and the powder is selected from a mixture of quartz sand, mineral powder and silica fume, with a mass ratio of quartz sand, mineral powder and silica fume of 1:(0.2~0.4):(0.4~0.6).

[0020] Secondly, the present invention also provides a method for preparing basalt fiber reinforced cement-based composite material, comprising the following steps: weighing fine aggregate, cement, filler and powder as needed and adding them to a mixer, setting the mixer to 600-800 r / min and stirring for 40-50 min, after the stirring is completed, adding water and water-reducing agent, setting the mixer to 120-160 r / min and stirring for 10-20 min, to obtain cement-based composite material.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. In this invention, during the preparation of cement-based composite materials, fillers are added. Basalt fibers, after being mixed with KH550, can form chelate structures on their surface, improving the bonding strength between basalt fibers and other materials. Clam shells, after processing, are prepared into nanocellulose, which can be filled into the material to enhance toughness. Simultaneously, the addition of phytic acid-modified starch, utilizing the complexation effect of the phosphate groups in the phytic acid-modified starch, reduces the porosity of the material interface transition zone, resulting in a more uniform bonding of the components and smoother stress transmission between them, thus improving the strength performance of the cement-based composite materials.

[0023] 2. In this invention, efficient dissociation of wood fibers can be achieved by cyclic freezing and high-pressure homogenization of powdered wood. During the cyclic freezing process, the water in the intercellular spaces rapidly crystallizes and expands. The expansion stress generated during ice crystal growth can destroy the lignin structure, allowing the cellulose microfibrils to be fully exposed, effectively improving the bonding strength with other additives, thereby enhancing the strength performance of cement-based composite materials. Attached Figure Description

[0024] Figure 1 A schematic diagram of a formula for a basalt fiber reinforced cementitious composite material and its preparation method is provided for the invention. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that the raw materials used in the following embodiments are all commercially available.

[0027] Example 1:

[0028] Raw material selection: 300 parts fine aggregate, 200 parts sulfoaluminate cement, 80 parts water, 40 parts filler, 30 parts powder, 30 parts silica fume, 1 part water-reducing agent;

[0029] Packing material preparation:

[0030] S1: Base material preparation, wherein the raw material for the base material is basalt fiber, and the base material is obtained after the basalt fiber is processed;

[0031] S2: Preparation of additives, wherein the raw material for the additives is wood clam, and after the wood clam is pretreated, it is further processed to obtain the additives;

[0032] S3: Mixing treatment, the base material and additives are mixed to obtain a mixture;

[0033] S4: Preparation process, further processing of the mixture to obtain the filler.

[0034] The method for preparing the base material is as follows: basalt fiber is added to a mixer, KH550, anhydrous ethanol and deionized water are added to the mixer, the mixer is set to 200 r / min and stirred for 20 min, the resulting product is washed and then sent to an oven, the oven is set to 60℃ and dried for 10 h to obtain the base material, wherein the mass ratio of KH550, anhydrous ethanol and deionized water is 1: (20): (250), and the mass of deionized water is 60% of the basalt fiber.

[0035] The pretreatment method for the clam wood is as follows: the clam wood is selected from the scraps of the chopping board processing plant. After the clam wood is recycled, it is ground with a particle size of 200μm. The ground product is then cleaned and sent to an oven. The oven is set to 50℃ for drying for 6 hours to complete the pretreatment of the clam wood.

[0036] The method for preparing the additive is as follows: the pretreated wood chips are added to a mixer, sodium hydroxide, urea and deionized water are added to the mixer, the mixer is set to 300 r / min and stirred for 30 min, the resulting product is frozen, the freezing temperature is (-15) ~ ℃, the freezing time is 4 h, after the freezing treatment is completed, it is placed in a room temperature environment to thaw for 1 h, the freezing and thawing treatment is repeated 3 times, the resulting product is sent to a high pressure homogenizer, the high pressure homogenizer is set to 100 MPa and the treatment time is 6 min, a slurry is obtained, the slurry is further processed to obtain the additive, wherein the mass ratio of sodium hydroxide, urea and deionized water is 1: (2): (40), and the mass of deionized water is twice the mass of the pretreated wood chips.

[0037] The mixing process is as follows: The slurry is processed by adding the slurry and carboxymethyl chitosan into a reactor. The reactor is heated to 45°C and the rotation speed is 400 r / min. The mixture is stirred at a constant temperature for 20 min. Then, a polyethyleneimine solution is added to the reactor and stirred at 200 r / min for 10 min at room temperature. The resulting product is added to a shear emulsifier and processed at 10000 r / min for 30 min to obtain the additive. The mass of carboxymethyl chitosan is 6% of the slurry mass, the mass concentration of the polyethyleneimine solution is 2%, and the mass of the polyethyleneimine solution is 3% of the slurry mass.

[0038] The mixing process is as follows: the base material, additives, phytic acid modified starch, and water are added to a mixer, the mixer is set to 400 r / min and stirred for 50 min, the resulting product is sent to an oven and dried at 60℃ for 10 min to complete the mixing process and obtain the mixture.

[0039] The mass ratio of base material, additives, phytic acid modified starch, and water is 1:(0.5):(0.1):(0.2).

[0040] The preparation method is as follows: the mixture, sucrose powder, maleic anhydride and graphene dispersion are added to the reaction vessel, the reaction vessel is set to heat to 40°C, the rotation speed is 400 r / min, and the mixture is stirred at a constant temperature for 20 min to obtain the filler. The mass ratio of the mixture, sucrose powder, maleic anhydride and graphene dispersion is 1:(0.06):(0.05):(0.06).

[0041] The fine aggregate is river sand, and the powder is a mixture of quartz sand, mineral powder and silica fume, with a mass ratio of quartz sand, mineral powder and silica fume of 1:(0.2):(0.4).

[0042] Preparation of basalt fiber reinforced cement-based composite material: Weigh out fine aggregate, cement, filler and powder as needed and add them to the mixer. Set the mixer to 600 r / min and mix for 40 min. After the mixing is completed, add water and water-reducing agent. Set the mixer to 120 r / min and mix for 10 min to obtain cement-based composite material.

[0043] Example 2:

[0044] Raw material selection: 350 parts fine aggregate, 250 parts sulfoaluminate cement, 100 parts water, 50 parts filler, 35 parts powder, 35 parts silica fume, 2 parts water-reducing agent;

[0045] Packing material preparation:

[0046] S1: Base material preparation, wherein the raw material for the base material is basalt fiber, and the base material is obtained after the basalt fiber is processed;

[0047] S2: Preparation of additives, wherein the raw material for the additives is wood clam, and after the wood clam is pretreated, it is further processed to obtain the additives;

[0048] S3: Mixing treatment, the base material and additives are mixed to obtain a mixture;

[0049] S4: Preparation process, further processing of the mixture to obtain the filler.

[0050] The method for preparing the base material is as follows: basalt fiber is added to a mixer, KH550, anhydrous ethanol and deionized water are added to the mixer, the mixer is set to 250 r / min and stirred for 25 min, the resulting product is washed and then sent to an oven, the oven is set to 70℃ and dried for 11 h to obtain the base material, wherein the mass ratio of KH550, anhydrous ethanol and deionized water is 1: (25): (270), and the mass of deionized water is 70% of the basalt fiber.

[0051] The pretreatment method for the clam wood is as follows: the clam wood is selected from the chipboard processing plant. After the clam wood is recycled, it is ground with a particle size of 250μm. The ground product is then cleaned and sent to an oven. The oven is set to 55℃ for drying for 7 hours to complete the pretreatment of the clam wood.

[0052] The method for preparing the additive is as follows: the pretreated wood chips are added to a mixer, sodium hydroxide, urea and deionized water are added to the mixer, the mixer is set to 350 r / min and stirred for 35 min, the resulting product is frozen at a temperature of (-20) ℃ for 5 h, after freezing, it is thawed at room temperature for 1.5 h, the freezing and thawing process is repeated 4 times, the resulting product is sent to a high pressure homogenizer, the high pressure homogenizer is set to 150 MPa and the processing time is 8 min, a slurry is obtained, the slurry is further processed to obtain the additive, wherein the mass ratio of sodium hydroxide, urea and deionized water is 1: (3): (50), and the mass of deionized water is 3 times the mass of the pretreated wood chips.

[0053] The mixing process is as follows: The slurry is processed by adding the slurry and carboxymethyl chitosan into a reactor. The reactor is heated to 50°C and stirred at 500 r / min for 25 min. Then, a polyethyleneimine solution is added to the reactor and stirred at 250 r / min for 15 min at room temperature. The resulting product is added to a shear emulsifier and processed at 11000 r / min for 35 min to obtain the additive. The mass of carboxymethyl chitosan is 7% of the slurry mass, the mass concentration of the polyethyleneimine solution is 2%, and the mass of the polyethyleneimine solution is 4% of the slurry mass.

[0054] The mixing process is as follows: the base material, additives, phytic acid modified starch, and water are added to a mixer, the mixer is set to 500 r / min and stirred for 55 min, the resulting product is sent to an oven and dried at 65℃ for 15 min to complete the mixing process and obtain the mixture.

[0055] The mass ratio of base material, additives, phytic acid modified starch, and water is 1:(0.55):(0.15):(0.3).

[0056] The preparation method is as follows: the mixture, sucrose powder, maleic anhydride and graphene dispersion are added to the reaction vessel, the reaction vessel is set to heat to 45°C, the rotation speed is 500 r / min, and the mixture is stirred at a constant temperature for 25 min to obtain the filler. The mass ratio of the mixture, sucrose powder, maleic anhydride and graphene dispersion is 1:(0.07):(0.06):(0.07).

[0057] The fine aggregate is river sand, and the powder is a mixture of quartz sand, mineral powder and silica fume, with a mass ratio of quartz sand, mineral powder and silica fume of 1:(0.3):(0.5).

[0058] Preparation of basalt fiber reinforced cement-based composite material: Weigh out fine aggregate, cement, filler and powder as needed and add them to the mixer. Set the mixer to 700 r / min and mix for 45 min. After the mixing is completed, add water and water-reducing agent. Set the mixer to 140 r / min and mix for 15 min to obtain cement-based composite material.

[0059] Example 3:

[0060] Raw material selection: 400 parts fine aggregate, 300 parts sulfoaluminate cement, 120 parts water, 60 parts filler, 40 parts powder, 40 parts silica fume, and 3 parts water-reducing agent;

[0061] Packing material preparation:

[0062] S1: Base material preparation, wherein the raw material for the base material is basalt fiber, and the base material is obtained after the basalt fiber is processed;

[0063] S2: Preparation of additives, wherein the raw material for the additives is wood clam, and after the wood clam is pretreated, it is further processed to obtain the additives;

[0064] S3: Mixing treatment, the base material and additives are mixed to obtain a mixture;

[0065] S4: Preparation process, further processing of the mixture to obtain the filler.

[0066] The method for preparing the base material is as follows: basalt fiber is added to a mixer, KH550, anhydrous ethanol and deionized water are added to the mixer, the mixer is set to 300 r / min and stirred for 30 min, the resulting product is washed and then sent to an oven, the oven is set to 80℃ and dried for 12 h to obtain the base material, wherein the mass ratio of KH550, anhydrous ethanol and deionized water is 1: (30): (300), and the mass of deionized water is 80% of the basalt fiber.

[0067] The pretreatment method for the clam wood is as follows: the clam wood is selected from the chipboard processing plant. After the clam wood is recycled, it is ground with a particle size of 300μm. The ground product is then cleaned and sent to an oven. The oven is set to 60℃ for drying for 8 hours to complete the pretreatment of the clam wood.

[0068] The method for preparing the additive is as follows: the pretreated wood chips are added to a mixer, sodium hydroxide, urea and deionized water are added to the mixer, the mixer is set to 400 r / min and stirred for 40 min, the resulting product is frozen at a temperature of (-25) ℃ for 6 h, after freezing, it is thawed at room temperature for 2 h, the freezing and thawing process is repeated 5 times, the resulting product is sent to a high pressure homogenizer, the high pressure homogenizer is set to 200 MPa and the processing time is 10 min to obtain a slurry, the slurry is further processed to obtain the additive, wherein the mass ratio of sodium hydroxide, urea and deionized water is 1: (4): (60), and the mass of deionized water is 4 times the mass of the pretreated wood chips.

[0069] The mixing process is as follows: The slurry is processed by adding the slurry and carboxymethyl chitosan into a reactor. The reactor is heated to 55°C and the rotation speed is 600 r / min. The mixture is stirred at a constant temperature for 30 min. Then, a polyethyleneimine solution is added to the reactor and stirred at 300 r / min for 20 min at room temperature. The resulting product is added to a shear emulsifier and processed at 12000 r / min for 40 min to obtain an additive. The mass of carboxymethyl chitosan is 8% of the slurry mass, the mass concentration of the polyethyleneimine solution is 2%, and the mass of the polyethyleneimine solution is 5% of the slurry mass.

[0070] The mixing process is as follows: the base material, additives, phytic acid modified starch, and water are added to a mixer, the mixer is set to 600 r / min and stirred for 60 min, the resulting product is sent to an oven and dried at 70℃ for 20 min to complete the mixing process and obtain the mixture.

[0071] The mass ratio of base material, additives, phytic acid modified starch, and water is 1:(0.6):(0.2):(0.4).

[0072] The preparation method is as follows: the mixture, sucrose powder, maleic anhydride and graphene dispersion are added to the reaction vessel, the reaction vessel is set to heat to 50°C, the rotation speed is 600 r / min, and the mixture is stirred at a constant temperature for 30 min to obtain the filler. The mass ratio of the mixture, sucrose powder, maleic anhydride and graphene dispersion is 1:(0.08):(0.07):(0.08).

[0073] The fine aggregate is river sand, and the powder is a mixture of quartz sand, mineral powder and silica fume, with a mass ratio of quartz sand, mineral powder and silica fume of 1:(0.4):(0.6).

[0074] Preparation of basalt fiber reinforced cement-based composite material: Weigh out fine aggregate, cement, filler and powder as needed and add them to the mixer. Set the mixer to 800 r / min and mix for 50 min. After the mixing is completed, add water and water-reducing agent. Set the mixer to 160 r / min and mix for 20 min to obtain cement-based composite material.

[0075] Comparative Example 1: The difference between this comparative example and Example 1 is that the wood clam was not subjected to cyclic freezing treatment in this comparative example.

[0076] Comparative Example 2: The difference between this comparative example and Example 1 is that an equal amount of wood powder is used to replace the additives in this comparative example.

[0077] Comparative Example 3 differs from Example 1 in that an equal amount of basalt fiber is used to replace the filler in this comparative example.

[0078] Comparative Example 4 differs from Example 1 in that it does not contain filler.

[0079] Performance testing: The cement-based composite materials prepared in Examples 1, 2, 3, 1, 2, 3, and 4 (Comparative Examples) were subjected to performance testing. The test data are recorded in the table below:

[0080] Table 1 Compressive Strength Test Table:

[0081]

[0082] Table 2 Flexural Strength Test Table:

[0083]

[0084] In the performance test, the test methods in GB / T17671-1999 were used to test the compressive strength and flexural strength of the cement-based composite materials prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4.

[0085] It is evident that the compressive strength and flexural strength of the cement-based composite materials prepared in Comparative Examples 1, 2, 3, and 4 are all lower than those in Examples 1, 2, and 3. This indicates that during the preparation of cement-based composite materials, the addition of fillers, specifically the chelated structure formed on the surface of basalt fibers after KH550 mixing treatment, enhances the bonding strength between basalt fibers and other materials. The nanocellulose prepared from treated wood can be incorporated into the material to enhance toughness. Furthermore, the addition of phytic acid-modified starch, utilizing the complexation effect of the phosphate groups in the phytic acid-modified starch, reduces the porosity of the material interface transition zone, resulting in a more uniform bonding of the components and smoother stress transmission between them, thus improving the strength performance of the cement-based composite materials.

[0086] By cyclically freezing and high-pressure homogenizing powdered wood, efficient dissociation of wood fibers can be achieved. During the cyclic freezing process, the water in the intercellular spaces rapidly crystallizes and expands. The expansion stress generated during ice crystal growth can destroy the lignin structure, allowing the cellulose microfibrils to be fully exposed. This effectively enhances the bonding strength with other additives, thereby improving the strength performance of cement-based composite materials.

[0087] By comparing and analyzing the relevant data in the table, it can be seen that the cement-based composite material prepared by this invention not only has good compressive strength but also excellent flexural strength. This indicates that the basalt fiber reinforced cement-based composite material provided by this invention has a broader market prospect and is more suitable for widespread application.

[0088] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0089] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A basalt fiber reinforced cementitious composite material, characterized in that: The raw materials include the following parts by weight: 300-400 parts fine aggregate, 200-300 parts sulfoaluminate cement, 80-120 parts water, 40-60 parts filler, 30-40 parts powder, 30-40 parts silica fume, and 1-3 parts water-reducing agent; The preparation of the filler includes the following steps: S1: Base material preparation, wherein the raw material for the base material is basalt fiber, and the base material is obtained after the basalt fiber is processed; S2: Preparation of additives, wherein the raw material for the additives is wood clam, and after the wood clam is pretreated, it is further processed to obtain the additives; S3: Mixing treatment, the base material and additives are mixed to obtain a mixture; S4: Preparation process, further processing of the mixture to obtain the filler.

2. The basalt fiber reinforced cementitious composite material according to claim 1, characterized in that, The method for preparing the base material is as follows: basalt fibers are added to a mixer, and KH550, anhydrous ethanol, and deionized water are added to the mixer. The mixer is set to 200-300 r / min and stirred for 20-30 min. The resulting product is washed and then sent to an oven. The oven is set to 60-80℃ and dried for 10-12 h to obtain the base material. The mass ratio of KH550, anhydrous ethanol, and deionized water is 1:(20-30):(250-300), and the mass of deionized water is 60-80% of the basalt fibers.

3. The basalt fiber reinforced cementitious composite material according to claim 1, characterized in that, The pretreatment method for the clam wood is as follows: the clam wood is selected from the chipboard processing plant. After the clam wood is recycled, it is ground. The grinding particle size is 200-300μm. The ground product is cleaned and then sent to an oven. The oven is set to 50-60℃ and dried for 6-8 hours to complete the pretreatment of the clam wood.

4. The basalt fiber reinforced cementitious composite material according to claim 1, characterized in that, The method for preparing the additive is as follows: Pretreated wood chips are added to a mixer, which contains sodium hydroxide, urea, and deionized water. The mixer is set to 300-400 r / min and stirred for 30-40 min. The resulting product is then subjected to freezing treatment at a temperature of (-15)-(-25)℃ for 4-6 h. After freezing, the product is thawed at room temperature for 1-2 h. This freezing and thawing process is repeated 3-5 times. The resulting product is then fed into a high-pressure homogenizer, set to 100-200 MPa for 6-10 min to obtain a slurry. The slurry is further processed to obtain the additive. The mass ratio of sodium hydroxide, urea, and deionized water is 1:(2-4):(40-60), and the mass of deionized water is 2-4 times the mass of the pretreated wood chips.

5. The basalt fiber reinforced cementitious composite material according to claim 4, characterized in that, The mixing process is as follows: the slurry is treated by adding the slurry and carboxymethyl chitosan to a reaction vessel, setting the temperature of the reaction vessel to 45-55°C, the rotation speed to 400-600 r / min, and stirring at a constant temperature for 20-30 min. Then, a polyethyleneimine solution is added to the reaction vessel, and the mixture is stirred at 200-300 r / min for 10-20 min at room temperature. The resulting product is then added to a shear emulsifier and treated at 10000-12000 r / min for 30-40 min to obtain the additive. The mass of carboxymethyl chitosan is 6-8% of the slurry mass, the mass concentration of the polyethyleneimine solution is 2%, and the mass of the polyethyleneimine solution is 3-5% of the slurry mass.

6. The basalt fiber reinforced cementitious composite material according to claim 1, characterized in that, The mixing process is as follows: the base material, additives, phytic acid modified starch, and water are added to a mixer, the mixer is set to 400-600 r / min and stirred for 50-60 min, the resulting product is sent to an oven and dried at 60-70℃ for 10-20 min to complete the mixing process and obtain the mixture.

7. The basalt fiber reinforced cementitious composite material according to claim 6, characterized in that, The mass ratio of base material, additives, phytic acid modified starch, and water is 1:(0.5-0.6):(0.1-0.2):(0.2-0.4).

8. The basalt fiber reinforced cementitious composite material according to claim 1, characterized in that, The preparation method is as follows: the mixture, sucrose powder, maleic anhydride, and graphene dispersion are added to a reaction vessel. The reaction vessel is heated to 40-50°C and the rotation speed is 400-600 r / min. The mixture is stirred at a constant temperature for 20-30 min to obtain the filler. The mass ratio of the mixture, sucrose powder, maleic anhydride, and graphene dispersion is 1:(0.06-0.08):(0.05-0.07):(0.06-0.08).

9. The basalt fiber reinforced cementitious composite material according to claim 1, characterized in that, The fine aggregate is river sand, and the powder is a mixture of quartz sand, mineral powder and silica fume, with a mass ratio of quartz sand, mineral powder and silica fume of 1:(0.2~0.4):(0.4~0.6).

10. A method for preparing a basalt fiber reinforced cementitious composite material according to any one of claims 1 to 9, characterized in that, The process includes the following steps: Weigh out fine aggregate, cement, filler, and powder as needed and add them to a mixer. Set the mixer to 600-800 r / min and mix for 40-50 minutes. After mixing, add water and water-reducing agent. Set the mixer to 120-160 r / min and mix for 10-20 minutes to obtain a cement-based composite material.

Images