CN115872681B - Modified polypropylene fiber concrete and preparation method thereof - Google Patents
Modified polypropylene fiber concrete and preparation method thereof Download PDFInfo
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- CN115872681B CN115872681B CN202211675751.4A CN202211675751A CN115872681B CN 115872681 B CN115872681 B CN 115872681B CN 202211675751 A CN202211675751 A CN 202211675751A CN 115872681 B CN115872681 B CN 115872681B
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Abstract
The invention relates to the technical field of composite materials, in particular to modified polypropylene fiber concrete and a preparation method thereof. The preparation method comprises the following steps: (1) preparation of a composite modifier; (2) preparation of modified polypropylene fibers; (3) mixing materials; and (4) preparing a finished product. The calcium carbonate powder and the carbon nano tube used in the invention lead the prepared polypropylene fiber to have better mechanical property; the organic phosphate nucleating agent has synergistic effect and can promote heterogeneous nucleation of polypropylene; the polyvinylpyrrolidone used in the invention has good dispersing effect on calcium carbonate, carbon nano tubes and organic phosphate nucleating agent, thereby improving the compatibility of modified polypropylene fibers in concrete; the invention enhances the meshing force of the concrete, improves the crack resistance and improves the safety performance of the polypropylene fiber concrete in the practical application process.
Description
Technical Field
The invention belongs to the technical field of composite materials, and particularly relates to modified polypropylene fiber concrete and a preparation method thereof.
Background
The concrete is the engineering material with the maximum consumption and the widest application range because of the advantages of abundant raw materials, low price, simple production process, high compressive strength, good durability and the like. However, the inherent disadvantages of concrete, such as low tensile strength, high brittleness, poor impact resistance and wear resistance, and easy occurrence of plastic cracking, make the application thereof in some projects difficult to meet the requirements. When the concrete crack exceeds the limit, aging of the material and deterioration of the structure are accelerated, resulting in a reduction in structural load-bearing capacity and durability. For example, in hydraulic engineering, dam concrete is cracked to cause water seepage and water leakage, so that the capacity of resisting various aggressive substances is weakened, and the normal operation of the dam is endangered. It is therefore necessary to provide more effective measures for preventing cracking of concrete and controlling the propagation of existing cracks.
Fiber concrete is the latest scientific research direction and important field of concrete modification, wherein polypropylene fiber concrete can effectively improve the mechanical properties of cement concrete, and compared with other traditional materials, polypropylene has the defects of low dispersibility, poor adhesion with a matrix and the like, and the application is limited.
In order to meet the requirements of various concrete projects, common concrete gradually develops towards the development directions of high strength, high performance, high ductility and high toughness, wherein fiber concrete is the latest scientific research direction and important field of concrete modification. At present, there is a need for polypropylene fiber concrete, which can improve the bonding performance of polypropylene fibers while ensuring that the polypropylene fibers have good compatibility with cement, and ensure that the polypropylene fiber concrete has good crack resistance.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the modified polypropylene fiber concrete and the preparation method thereof, and the calcium carbonate powder and the carbon nano tube used in the invention enable the prepared polypropylene fiber to have better mechanical properties; the organic phosphate nucleating agent has synergistic effect and can promote heterogeneous nucleation of polypropylene; the polyvinylpyrrolidone used in the invention has good dispersing effect on calcium carbonate, carbon nano tubes and organic phosphate nucleating agent, thereby improving the compatibility of modified polypropylene fibers in concrete; the invention enhances the meshing force of the concrete, improves the crack resistance and improves the safety performance of the polypropylene fiber concrete in the practical application process.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a preparation method of modified polypropylene fiber concrete comprises the following steps:
(1) Preparation of the composite modifier: uniformly mixing calcium carbonate powder, carbon nano tubes and an organic phosphate nucleating agent to obtain a composite modifier;
(2) Preparation of modified polypropylene fibers: adding polypropylene particles into the composite modifier obtained in the step (1) and uniformly mixing, then continuously adding polyvinylpyrrolidone and melt blending, extruding, granulating and spinning after the melt blending is finished to obtain modified polypropylene fibers;
(3) Mixing materials: mixing coarse aggregate, fine aggregate, fly ash, silicon dioxide powder and cement, primarily stirring, adding water and a water reducing agent after stirring, and secondarily stirring to obtain an intermediate product;
(4) Preparing a finished product: and (3) mixing and stirring the modified polypropylene fiber obtained in the step (2) and the intermediate product obtained in the step (3) to obtain the modified polypropylene fiber concrete.
Preferably, the components in the step (1) and the step (2) are added in the following amounts by weight percent:
preferably, the particle size of the calcium carbonate powder in the step (1) is 50-120nm; the length of the carbon nano tube is 5-15 mu m, and the diameter is 20-40nm.
Preferably, the melt blending in the step (2) is performed in a high-speed mixer, the temperature of the melt blending is 190-210 ℃, and the time of the melt blending is 1-3min; the spinning temperature is 220-280 ℃; the length of the modified polypropylene fiber obtained after spinning is 15-25mm, and the diameter is 25-35 mu m.
Preferably, in the step (3), the coarse aggregate is gravel, the grain size is 5-8mm, the fine aggregate is sand, the grain size is 2-5mm, and the water reducer is naphthalene water reducer.
Preferably, the materials in the step (3) are added in the following amounts in parts by weight: 100-110 parts of coarse aggregate, 80-85 parts of fine aggregate, 8-10 parts of fly ash, 5-10 parts of silicon dioxide powder, 120-150 parts of cement, 25-30 parts of water and 1-2 parts of water reducer.
Preferably, the stirring in the step (3) is performed in a stirrer, the primary stirring time is 3-5min, and the secondary stirring time is 1-2min.
Preferably, the mixing mass ratio of the modified polypropylene fiber and the intermediate product in the step (4) is (1-2): (2500-3000), wherein the stirring time is 3-5min.
The invention also discloses the modified polypropylene fiber concrete prepared by the method.
Compared with the prior art, the invention has the following beneficial effects:
(1) The composite modifier used in the invention is composed of calcium carbonate powder, carbon nano tubes and an organic phosphate nucleating agent, wherein the calcium carbonate powder and the carbon nano tubes are used as nano material particles, have high specific surface area and high surface free energy, the nano-grade calcium carbonate and the carbon nano tubes are filled into polypropylene to modify the polypropylene, have obvious heterogeneous nucleation on polypropylene crystallization, and have fine crystals and large crystallinity, so that the manufactured polypropylene fiber has better mechanical property; the organic phosphate nucleating agent can improve the crystallization temperature and crystallization rate of polypropylene, has a synergistic effect with nano calcium carbonate powder and carbon nano tubes, so that the polypropylene can be quickly nucleated, the heterogeneous nucleation capability of the polypropylene is promoted together, the modified polypropylene fiber and concrete have higher interface bonding strength, and the crack resistance and mechanical property of the modified polypropylene fiber are improved; the polyvinylpyrrolidone used in the invention is used as a nonionic amphiphilic polymer, so that the dispersion effect of the composite modifier is good, the compatibility of the modified polypropylene fibers in the concrete is improved, and the performance of the modified polypropylene concrete can be further improved;
(2) According to the invention, the modified polypropylene fiber and cement are mixed to prepare the modified polypropylene fiber concrete, so that the engaging force of the concrete is enhanced, the crack resistance is improved, the structure of the concrete is improved by the modified polypropylene fiber, the mechanical property of the concrete is improved, the generation of new cracks and the extension and expansion of original cracks in the concrete can be inhibited, and the safety performance of the polypropylene fiber concrete in the actual application process is improved.
Drawings
FIG. 1 is a schematic diagram of the preparation flow of the modified polypropylene fiber concrete of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following examples. Of course, the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Although the steps of the present invention are arranged by reference numerals, the order of the steps is not limited, and the relative order of the steps may be adjusted unless the order of the steps is explicitly stated or the execution of a step requires other steps as a basis. It is to be understood that the term "and/or" as used herein relates to and encompasses any and all possible combinations of one or more of the associated listed items.
Unless otherwise specified, both chemical reagents and materials in the present invention are purchased through a market route or synthesized from raw materials purchased through a market route.
The brand of the polypropylene particles is Y2600T;
the calcium carbonate powder is purchased from Ruicheng Huana nano materials limited company;
the carbon nanotubes are purchased from Jiangsu Xianfeng nano materials science and technology Co., ltd;
the model of the organic phosphate nucleating agent is NA-11;
the polyvinylpyrrolidone is purchased from Hangzhou Ying Yu chemical industry Co., ltd;
the naphthalene water reducer is purchased from Jinan Haobang chemical industry Co., ltd;
the model number of the high-speed mixer is 5-2000L;
the model of the stirrer is JS750.
Example 1
A preparation method of modified polypropylene fiber concrete comprises the following steps:
(1) Preparation of the composite modifier: uniformly mixing 80g of calcium carbonate powder with the particle size of 70nm, 80g of carbon nano tubes with the length of 10 mu m and the diameter of 30nm and 120g of organic phosphate nucleating agent to obtain a composite modifier;
(2) Preparation of modified polypropylene fibers: adding 750g of polypropylene particles into the composite modifier obtained in the step (1) and uniformly mixing, then continuously adding 120g of polyvinylpyrrolidone, carrying out melt blending for 2min at 200 ℃ in a high-speed mixer, extruding, granulating and spinning at 250 ℃ after the melt blending is finished, and obtaining the modified polypropylene fiber with the length of 20mm and the diameter of 30 mu m;
(3) Mixing materials: 10.5kg of gravel with the particle size of 6mm, 8.2kg of sand with the particle size of 3mm, 900g of fly ash, 800g of silicon dioxide powder and 14kg of cement are mixed, stirred in a stirrer for 4min, 2.8kg of water and 150g of naphthalene water reducer are added after stirring is finished, and stirring is continued for 1min to obtain an intermediate product;
(4) Preparing a finished product: and (3) mixing 15g of the modified polypropylene fiber obtained in the step (2) with 27kg of the intermediate product obtained in the step (3), and stirring for 4min to obtain the modified polypropylene fiber concrete.
Example 2
A preparation method of modified polypropylene fiber concrete comprises the following steps:
(1) Preparation of the composite modifier: uniformly mixing 50g of calcium carbonate powder with the particle size of 70nm, 50g of carbon nano tube with the length of 10 mu m and the diameter of 30nm and 100g of organic phosphate nucleating agent to obtain a composite modifier;
(2) Preparation of modified polypropylene fibers: adding 700g of polypropylene particles into the composite modifier obtained in the step (1), uniformly mixing, adding 100g of polyvinylpyrrolidone, carrying out melt blending for 2min at 190 ℃ in a high-speed mixer, extruding, granulating and spinning at 190 ℃ after the melt blending is finished, and obtaining the modified polypropylene fiber with the length of 20mm and the diameter of 30 mu m;
(3) Mixing materials: 10kg of gravel with the grain size of 6mm, 8kg of sand with the grain size of 3mm, 800g of fly ash, 500g of silicon dioxide powder and 12kg of cement are mixed, stirred in a stirrer for 3min, 2.5kg of water and 100g of naphthalene water reducer are added after stirring is finished, and stirring is continued for 1min to obtain an intermediate product;
(4) Preparing a finished product: and (3) mixing 10g of the modified polypropylene fiber obtained in the step (2) with 25kg of the intermediate product obtained in the step (3), and stirring for 3min to obtain the modified polypropylene fiber concrete.
Example 3
A preparation method of modified polypropylene fiber concrete comprises the following steps:
(1) Preparation of the composite modifier: uniformly mixing 100g of calcium carbonate powder with the particle size of 70nm, 100g of carbon nano tube with the length of 10 mu m and the diameter of 30nm and 150g of organic phosphate nucleating agent to obtain a composite modifier;
(2) Preparation of modified polypropylene fibers: adding 800g of polypropylene particles into the composite modifier obtained in the step (1), uniformly mixing, then continuously adding 150g of polyvinylpyrrolidone, carrying out melt blending for 3min at 210 ℃ in a high-speed mixer, extruding, granulating and spinning at 280 ℃ after the melt blending is finished, and obtaining the modified polypropylene fiber with the length of 20mm and the diameter of 30 mu m;
(3) Mixing materials: 11kg of gravel with the particle size of 6mm, 8.5kg of sand with the particle size of 3mm, 1kg of fly ash, 1kg of silicon dioxide powder and 15kg of cement are mixed and stirred in a stirrer for 5min to obtain a material A; adding 3kg of water and 200g of naphthalene water reducer after stirring is completed, and continuously stirring uniformly for 2min to obtain an intermediate product;
(4) Preparing a finished product: and (3) mixing 20g of the modified polypropylene fiber obtained in the step (2) with 30kg of the intermediate product obtained in the step (3), and stirring for 5min to obtain the modified polypropylene fiber concrete.
Comparative example 1
A preparation method of modified polypropylene fiber concrete comprises the following steps:
(1) Preparation of the composite modifier: uniformly mixing 80g of calcium carbonate powder with the particle size of 70nm and 80g of carbon nano tubes with the length of 10 mu m and the diameter of 30nm to obtain a composite modifier;
(2) Preparation of modified polypropylene fibers: adding 750g of polypropylene particles into the composite modifier obtained in the step (1) and uniformly mixing, then continuously adding 120g of polyvinylpyrrolidone, carrying out melt blending for 2min at 200 ℃ in a high-speed mixer, extruding, granulating and spinning at 250 ℃ after the melt blending is finished, and obtaining the modified polypropylene fiber with the length of 20mm and the diameter of 30 mu m;
(3) Mixing materials: 10.5kg of gravel with the particle size of 6mm, 8.2kg of sand with the particle size of 3mm, 900g of fly ash, 800g of silicon dioxide powder and 14kg of cement are mixed, stirred in a stirrer for 4min, 2.8kg of water and 150g of naphthalene water reducer are added after stirring is finished, and stirring is continued for 1min to obtain an intermediate product;
(4) Preparing a finished product: and (3) mixing 15g of the modified polypropylene fiber obtained in the step (2) with 27kg of the intermediate product obtained in the step (3), and stirring for 4min to obtain the modified polypropylene fiber concrete.
The difference between this comparative example and example 1 is that this comparative example does not use an organophosphate nucleating agent.
Comparative example 2
A preparation method of modified polypropylene fiber concrete comprises the following steps:
(1) Preparation of the composite modifier: uniformly mixing 80g of calcium carbonate powder with the particle size of 70nm and 120g of organic phosphate nucleating agent to obtain a composite modifier;
(2) Preparation of modified polypropylene fibers: adding 750g of polypropylene particles into the composite modifier obtained in the step (1) and uniformly mixing, then continuously adding 120g of polyvinylpyrrolidone, carrying out melt blending for 2min at 200 ℃ in a high-speed mixer, extruding, granulating and spinning at 250 ℃ after the melt blending is finished, and obtaining the modified polypropylene fiber with the length of 20mm and the diameter of 30 mu m;
(3) Mixing materials: 10.5kg of gravel with the particle size of 6mm, 8.2kg of sand with the particle size of 3mm, 900g of fly ash, 800g of silicon dioxide powder and 14kg of cement are mixed, stirred in a stirrer for 4min, 2.8kg of water and 150g of naphthalene water reducer are added after stirring is finished, and stirring is continued for 1min to obtain an intermediate product;
(4) Preparing a finished product: and (3) mixing 15g of the modified polypropylene fiber obtained in the step (2) with 27kg of the intermediate product obtained in the step (3), and stirring for 4min to obtain the modified polypropylene fiber concrete. The difference between this comparative example and example 1 is that the carbon nanotubes are not used in this comparative example.
Comparative example 3
A preparation method of modified polypropylene fiber concrete comprises the following steps:
(1) Preparation of the composite modifier: uniformly mixing 80g of carbon nano tube with the length of 10 mu m and the diameter of 30nm and 120g of organic phosphate nucleating agent to obtain a composite modifier;
(2) Preparation of modified polypropylene fibers: adding 750g of polypropylene particles into the composite modifier obtained in the step (1) and uniformly mixing, then continuously adding 120g of polyvinylpyrrolidone, carrying out melt blending for 2min at 200 ℃ in a high-speed mixer, extruding, granulating and spinning at 250 ℃ after the melt blending is finished, and obtaining the modified polypropylene fiber with the length of 20mm and the diameter of 30 mu m;
(3) Mixing materials: 10.5kg of gravel with the particle size of 6mm, 8.2kg of sand with the particle size of 3mm, 900g of fly ash, 800g of silicon dioxide powder and 14kg of cement are mixed, stirred in a stirrer for 4min, 2.8kg of water and 150g of naphthalene water reducer are added after stirring is finished, and stirring is continued for 1min to obtain an intermediate product;
(4) Preparing a finished product: and (3) mixing 15g of the modified polypropylene fiber obtained in the step (2) with 27kg of the intermediate product obtained in the step (3), and stirring for 4min to obtain the modified polypropylene fiber concrete. The difference between this comparative example and example 1 is that no calcium carbonate powder was used in this comparative example.
Comparative example 4
A preparation method of modified polypropylene fiber concrete comprises the following steps:
(1) Preparation of the composite modifier: uniformly mixing 80g of calcium carbonate powder with the particle size of 70nm, 80g of carbon nano tubes with the length of 10 mu m and the diameter of 30nm and 120g of organic phosphate nucleating agent to obtain a composite modifier;
(2) Preparation of modified polypropylene fibers: adding 750g of polypropylene particles into the composite modifier obtained in the step (1), carrying out melt blending for 2min at 200 ℃ in a high-speed mixer, extruding, granulating and spinning at 250 ℃ after the melt blending is finished, and obtaining modified polypropylene fibers with the length of 20mm and the diameter of 30 mu m;
(3) Mixing materials: 10.5kg of gravel with the particle size of 6mm, 8.2kg of sand with the particle size of 3mm, 900g of fly ash, 800g of silicon dioxide powder and 14kg of cement are mixed, stirred in a stirrer for 4min, 2.8kg of water and 150g of naphthalene water reducer are added after stirring is finished, and stirring is continued for 1min to obtain an intermediate product;
(4) Preparing a finished product: and (3) mixing 15g of the modified polypropylene fiber obtained in the step (2) with 27kg of the intermediate product obtained in the step (3), and stirring for 4min to obtain the modified polypropylene fiber concrete. The difference between this comparative example and example 1 is that no polyvinylpyrrolidone was added.
Comparative example 5
A preparation method of polypropylene fiber concrete comprises the following steps:
(1) Preparation of polypropylene fibers: putting 750g of polypropylene particles into a high-speed mixer to be melt-blended for 2min at 200 ℃, extruding, granulating and spinning at 250 ℃ after the melt-blending is finished to prepare modified polypropylene fibers with the length of 20mm and the diameter of 30 mu m;
(2) Mixing materials: 10.5kg of gravel with the particle size of 6mm, 8.2kg of sand with the particle size of 3mm, 900g of fly ash, 800g of silicon dioxide powder and 14kg of cement are mixed, stirred in a stirrer for 4min, 2.8kg of water and 150g of naphthalene water reducer are added after stirring is finished, and stirring is continued for 1min to obtain an intermediate product;
(3) Preparing a finished product: and (3) mixing 15g of the polypropylene fiber obtained in the step (1) with 27kg of the intermediate product obtained in the step (2), and stirring for 4min to obtain the polypropylene fiber concrete. The difference between this comparative example and example 1 is that no complex modifier and no polyvinylpyrrolidone were added.
The modified polypropylene fiber concretes prepared in examples 1-3 and comparative examples 1-5 were subjected to die filling by a manual tamping method, uniformly inserted and tamped by a tamping rod, then inserted and tamped by a spatula for several times, and gently tapped around the die by a rubber hammer after the insertion and tamping until the cavity disappeared. The test piece mold was cured under standard curing conditions for 28 days and left in the natural environment to an age of 60 days, and then the test piece was removed from the mold.
The crack resistance of the concrete was measured by a flat plate method, the dimensions of the flat plate test mold were 600 mm. Times.400 mm. Times.100 mm, constraint was provided by a bent wavy iron plate, and the test pieces prepared and maintained in examples 1 to 3 and comparative examples 1 to 5 were put into the flat plate test mold, vibrated on a vibrating table for about 1min, smoothed, and moved into an observation chamber. The temperature of the observation chamber is 24-26 ℃, the relative humidity is 60-70%, the surface of the test piece is directly blown by an electric fan after the test piece is placed, the wind speed is 8m/s, and the test piece is continuously blown for 24 hours. The observation is based on the visual crack, and the length of the crack is measured by a steel ruler; when the crack is obviously bent, the sum of the lengths of the folding lines can be used for representing the length of the crack.The crack width was measured with a reading microscope with an index value of 0.01mm, 3 crack widths were measured along the crack length, and the maximum value was taken as the nominal maximum crack width. The method for evaluating the cracking resistance of the fiber concrete is comprehensively evaluated according to the maximum crack width of less than or equal to 0.2mm and the average crack area of less than or equal to 10mm by referring to the evaluation method in the national institute of engineering, civil engineering, water conservancy and architecture, concrete structure durability design and construction guide 2 The number of cracking cracks per unit area is less than or equal to 25 pieces/m 2 The total cracking area in unit area is less than or equal to 100mm 2 /m 2 The cracking resistance of the concrete was evaluated by classifying the cracking resistance into 5 grades for the evaluation criteria, and the results are shown in table 1:
TABLE 1 data results of cracking test of Polypropylene fiber concrete
As can be seen from the data, the cracking resistance grade of examples 1-3 is grade I, and the modified polypropylene fiber concrete prepared by the invention has better cracking resistance.
The cured test pieces prepared in examples 1 to 3 and comparative examples 1 to 5 were subjected to mechanical property test, and the results were shown in Table 2:
TABLE 2 results of data on mechanical properties of Polypropylene fiber concrete
| Project | Tensile strength (MPa) | Compressive strength (MPa) |
| Example 1 | 6.58 | 71.8 |
| Example 2 | 6.45 | 70.9 |
| Example 3 | 6.42 | 70.2 |
| Comparative example 1 | 5.34 | 63.4 |
| Comparative example 2 | 5.38 | 62.8 |
| Comparative example 3 | 5.42 | 63.9 |
| Comparative example 4 | 5.34 | 62.4 |
| Comparative example 5 | 5.18 | 60.5 |
As can be seen from the data, the modified polypropylene fiber concrete prepared in the examples 1-3 has higher tensile strength and compressive strength and better mechanical property.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and changes can be made by those skilled in the art without departing from the inventive concept and remain within the scope of the invention.
Claims (7)
1. The preparation method of the modified polypropylene fiber concrete is characterized by comprising the following steps of:
(1) Preparation of the composite modifier: uniformly mixing calcium carbonate powder, carbon nano tubes and an organic phosphate nucleating agent to obtain a composite modifier;
(2) Preparation of modified polypropylene fibers: adding polypropylene particles into the composite modifier obtained in the step (1) and uniformly mixing, then continuously adding polyvinylpyrrolidone and melt blending, extruding, granulating and spinning after the melt blending is finished to obtain modified polypropylene fibers;
(3) Mixing materials: mixing coarse aggregate, fine aggregate, fly ash, silicon dioxide powder and cement, primarily stirring, adding water and a water reducing agent after stirring, and secondarily stirring to obtain an intermediate product; the material adding amount in the step (3) is as follows in parts by weight: 100-110 parts of coarse aggregate, 80-85 parts of fine aggregate, 8-10 parts of fly ash, 5-10 parts of silicon dioxide powder, 120-150 parts of cement, 25-30 parts of water and 1-2 parts of water reducer;
(4) Preparing a finished product: mixing and stirring the modified polypropylene fiber obtained in the step (2) and the intermediate product obtained in the step (3) to obtain modified polypropylene fiber concrete;
the components in the step (1) and the step (2) are added in the following amounts by weight: 5-10 parts of calcium carbonate powder; 5-10 parts of carbon nano tube; 10-15 parts of organic phosphate nucleating agent; 10-15 parts of polyvinylpyrrolidone; 70-80 parts of polypropylene particles;
the mixing mass ratio of the modified polypropylene fiber to the intermediate product in the step (4) is (1-2): (2500-3000).
2. The method for producing a modified polypropylene fiber concrete according to claim 1, wherein the particle size of said calcium carbonate powder in step (1) is 50 to 120nm; the length of the carbon nano tube is 5-15 mu m, and the diameter is 20-40nm.
3. The method for preparing modified polypropylene fiber concrete according to claim 1, wherein the melt blending in the step (2) is performed in a high-speed mixer, the melt blending temperature is 190-210 ℃, and the melt blending time is 1-3min; the spinning temperature is 220-280 ℃; the length of the modified polypropylene fiber obtained after spinning is 15-25mm, and the diameter is 25-35 mu m.
4. The preparation method of the modified polypropylene fiber concrete according to claim 1, wherein the coarse aggregate in the step (3) is gravel, the grain size is 5-8mm, the fine aggregate is sand, the grain size is 2-5mm, and the water reducer is naphthalene water reducer.
5. The method for producing a modified polypropylene fiber concrete according to claim 1, wherein said stirring in step (3) is performed in a stirrer, said primary stirring time is 3 to 5 minutes, and said secondary stirring time is 1 to 2 minutes.
6. The method for producing a modified polypropylene fiber concrete according to claim 1, wherein said stirring time in said step (4) is 3 to 5 minutes.
7. A modified polypropylene fiber concrete prepared by the method of any one of claims 1-6.
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