Alkali-resistant glass fiber tailings sand concrete and preparation method thereof

Abstract

The present invention provides an alkali-resistant glass fiber tailings sand concrete and a preparation method thereof, belonging to the technical field of cement-based building materials. The alkali-resistant glass fiber tailings sand concrete is composed of the following raw materials in parts by weight: 1000-1100g of coarse aggregate, 100-150g of fly ash, 500-540g of river sand, 300-350g of cement, 190-210g of water, 400-430g of modified phosphorus tailings sand, 90-110g of iron tailings sand, 5-15g of modified alkali-resistant glass fiber, 3g of water reducer, and 1g of cellulose ether. The present invention utilizes the above-mentioned alkali-resistant glass fiber tailings sand concrete and its preparation method to prepare a new building material with improved mechanical properties, greenness, and environmental protection, which can achieve secondary utilization of solid waste and improve comprehensive economic and ecological benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of cement-based building materials, in particular to an alkali-resistant glass fiber tailings sand concrete and a preparation method thereof. Background Art

[0002] Glass fiber, thanks to its low energy consumption in production, renewable raw materials, and recyclable properties, has played a key role in building material innovation. Alkali-resistant glass fiber, in particular, is a lightweight material with a lower density than traditional metal materials such as steel fiber, helping to reduce structural weight and, in turn, transportation energy consumption. In concrete preparation, alkali-resistant glass fiber acts as a reinforcement, strengthening the concrete's internal structure and making it a green and sustainable building material.

[0003] At the same time, the comprehensive utilization of bulk solid waste, especially the reuse of iron tailings and phosphate tailings, has become an important way to reduce carbon emissions in the construction industry. Iron tailings, a waste product from iron ore processing, can replace river sand as concrete aggregate or stimulate its activity to act as a cementitious material, which not only reduces raw material costs but also solves the environmental problems caused by the accumulation of iron tailings. Phosphate tailings, a by-product of phosphate rock mining, not only occupies land and poses safety hazards, but also increases the cost of tailings pond construction and maintenance. However, phosphate tailings contain a large amount of SiO2 and a certain amount of CaO, making them potential active materials. Studies have shown that the addition of an appropriate amount of phosphate tailings can improve the mechanical properties of concrete, enhance its durability and bearing capacity, thereby achieving the comprehensive utilization of waste resources and promoting resource recycling.

[0004] In the prior art, patent publication number CN115611594.A discloses a heat-resistant and impermeable concrete material and preparation method using a synergistic combination of phosphate tailings powder and steel fibers (Patent 1). This method incorporates phosphate tailings powder and steel fibers in a reasonable ratio to improve the material's impermeability and heat resistance. Furthermore, the addition of phosphate tailings powder and steel fibers imparts good flexural toughness and compressive strength to the material.

[0005] Patent publication number CN112694302.A discloses a glass fiber concrete and its preparation process (Patent 2). This invention adds alkali-resistant glass fiber to the concrete making material, solving the problems of poor compressive strength and toughness in the prior art.

[0006] The above-mentioned technologies have the following shortcomings: (1) The steel fibers in Patent 1 tend to clump during the mixing process. During the production process, due to the weight of the steel fibers, the steel fibers will accumulate at the bottom of the concrete, resulting in uneven fiber distribution. Moreover, the adhesion between the steel fibers and the concrete is insufficient, and they are prone to pull-out damage, which in turn affects the splitting tensile strength of the concrete. (2) The glass fibers in Patent 2 are generally rigid, while the polypropylene fibers are relatively soft. This may result in the plasticity of the concrete being limited to a certain extent, especially in applications that require a high degree of plasticity. In addition, polypropylene fibers have a low melting point, which means that they may melt in a high-temperature environment, thereby reducing the durability of the concrete.

[0007] Therefore, a new type of concrete and its preparation method are urgently needed to solve the above problems. Summary of the Invention

[0008] The purpose of the present invention is to provide an alkali-resistant glass fiber tailings sand concrete and a preparation method thereof, so as to prepare a new building material with better mechanical properties, greenness and environmental protection, which can realize the secondary utilization of solid waste and improve the comprehensive economic and ecological benefits.

[0009] To achieve the above object, the present invention provides an alkali-resistant glass fiber tailings sand concrete, which is composed of the following raw materials in parts by weight: 1000-1100g of coarse aggregate, 100-150g of fly ash, 500-540g of river sand, 300-350g of cement, 190-210g of water, 400-430g of modified phosphorus tailings sand, 90-110g of iron tailings sand, 5-15g of modified alkali-resistant glass fiber, 3g of water reducer, and 1g of cellulose ether;

[0010] The modified alkali-resistant glass fiber is obtained by the following preparation method:

[0011] At 25° C., 1 kg of vinyltrimethoxysilane was mixed with 1 kg of distilled water to obtain a mixed solution, and the alkali-resistant glass fiber was immersed in the mixed solution for 30 minutes to treat the surface of the alkali-resistant glass fiber;

[0012] After draining the mixed solution, the alkali-resistant glass fiber was rinsed with distilled water for 4 times to obtain rinsed alkali-resistant glass fiber;

[0013] The washed alkali-resistant glass fiber is placed in a drying oven at 90°C and dried for 23 hours to obtain the modified alkali-resistant glass fiber;

[0014] The modified phosphate tailings sand is obtained by the following preparation method:

[0015] At 25°C, half of the total amount of unmodified phosphorus tailings sand was washed with anhydrous ethanol to remove impurities;

[0016] Place the cleaned unmodified phosphate tailings in a drying oven at 90°C and dry for 12 hours;

[0017] The dried unmodified phosphorus tailings sand was placed in a small muffle furnace and subjected to high temperature treatment at 850°C for 6 hours;

[0018] The treated unmodified phosphate tailings sand was allowed to stand at 25°C for 12 hours, and finally mixed with the unmodified phosphate tailings sand to obtain modified phosphate tailings sand;

[0019] The particle size of the modified phosphate tailings sand is 0.25-0.50 mm, the internal radiation coefficient is 0.8, and the external radiation coefficient is 0.7;

[0020] Among them, the fluorine content in unmodified phosphate tailings sand accounts for 2.5-3%, and the acid-insoluble matter accounts for 22-23%.

[0021] Preferably, the coarse aggregate is natural rock, pebble or mine waste rock processed by machinery, and the particle size is between 5 and 20 mm.

[0022] Preferably, the fly ash is Class F fly ash with a particle size range of 50 to 400 μm and a specific surface area of not less than 400 m 2 / kg.

[0023] Preferably, the cement is ordinary Portland cement with a specific surface area of 370m 2 / kg, density 3.25g / cm 3 ; Chemical composition: SiO2 accounts for 22.85%, Al2O3 accounts for 4.74%, Fe2O3 accounts for 3.26%, CaO accounts for 61.80%, MgO accounts for 0.85%, and SO3 accounts for 7.3%; Mineral components include: 3CaO·SiO2, 2CaO·SiO2, 3CaO·Al2O3 and 4CaO·Al2O3·Fe2O3; The 28-day compressive strength of the cement is not less than 42.5MPa.

[0024] Preferably, the particle size of river sand is 0.30-4.75 mm, which meets the requirements of the national standard GB / T14684-2022 "Sand for Construction".

[0025] Preferably, the iron tailings have a particle size of 0.1 to 0.5 mm, and a magnet is used to magnetically attract the iron tailings until the magnetic particles are completely sucked out; and the iron tailings after magnetic separation are rinsed with anhydrous ethanol to remove impurities.

[0026] Preferably, the modified alkali-resistant glass fiber includes two types with a length of 9 mm and 15 mm, with a single fiber diameter of 20 μm, a linear density of 8.12 tex, a melting point of 169.0°C, a tensile strength of not less than 346.0 MPa, and a breaking elongation rate of 30%. The content of the 15 mm length accounts for 80% of the total fiber amount, and the content of the 9 mm length accounts for 20% of the total fiber amount.

[0027] Preferably, the water reducer is a polycarboxylate water reducer.

[0028] The present invention also provides a method for preparing alkali-resistant glass fiber tailings sand concrete, comprising the following steps:

[0029] Step S1: First, coarse aggregate and river sand weighed by weight are placed in a mixer and dry-mixed at a slow speed to make them uniform;

[0030] Step S2: adding all the cement, fly ash, iron tailings and modified phosphorus tailings into a mixer and stirring slowly;

[0031] Step S3: After stirring is completed, add water reducer and water and continue stirring at a slow speed;

[0032] Step S4: After stirring evenly, add cellulose ether and continue stirring slowly;

[0033] Step S5: adding the modified alkali-resistant glass fiber into a blender and rapidly stirring to obtain a stirred slurry;

[0034] Step S6: pouring the stirred slurry into a mold, vibrating it into shape, and sealing it with a plastic film. After demoulding, the mold is removed and the slurry is cured at room temperature for 28 days to obtain alkali-resistant glass fiber tailings sand concrete.

[0035] Preferably, in step S1, the slow dry mixing time is 1 to 2 minutes; in step S2, the slow stirring time is 1 to 3 minutes; in step S3, the slow stirring time is 2 to 3 minutes; in step S4, the slow stirring time is 1 to 2 minutes; in step S5, the rapid stirring time is 3 to 5 minutes; and in step S6, the vibration time is 5 to 7 minutes.

[0036] In the present invention, alkali-resistant glass fiber is a reinforcing fiber processed by a unique production process. It can effectively control the micro cracks caused by plastic shrinkage, drying shrinkage, temperature and humidity changes in concrete or cement mortar, prevent the generation of cracks and effectively inhibit their expansion, thereby significantly improving the concrete's impermeability, impact load resistance, chemical corrosion resistance, and comprehensive performance against high-speed water flow and bed load abrasion, extending the service life of the structure. However, since the surface of alkali-resistant glass fiber is relatively smooth, the bonding performance between it and concrete is poor. By modifying its surface, its surface chemical properties and roughness can be improved, thereby improving the interface bonding with cement-based slurry and improving the crack resistance of concrete.

[0037] Therefore, the present invention adopts the above-mentioned alkali-resistant glass fiber tailings sand concrete and its preparation method, and the beneficial technical effects are as follows:

[0038] (1) The present invention successfully overcomes the problem of uneven dispersion of alkali-resistant glass fibers in concrete by precisely controlling the incorporation ratio of alkali-resistant glass fibers of different lengths, and significantly improves the elastic modulus and tensile properties of concrete, effectively making up for the shortcomings of traditional concrete in this regard.

[0039] (2) The present invention innovatively uses modified phosphorus tailings sand and iron tailings sand to replace 40% to 50% of the river sand usage, which not only provides a new way for the comprehensive recycling of tailings resources, but also greatly reduces the demand for traditional natural sand and gravel aggregates, effectively promoting the dual goals of environmental protection and resource conservation.

[0040] The concrete prepared by the present invention significantly reduces river sand consumption and alleviates environmental pollution caused by phosphate tailings by efficiently utilizing alkali-resistant glass fiber and tailings sand, while reducing carbon emissions and demonstrating excellent green and environmentally friendly characteristics. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is further illustrated by the following examples.

[0042] Unless otherwise defined, technical or scientific terms used in the present invention shall have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

[0043] In the present invention, phosphorus tailings sand and alkali-resistant glass fiber are modified, and the modification methods are as follows:

[0044] The modified alkali-resistant glass fiber is obtained by the following preparation method:

[0045] At 25° C., 1 kg of vinyltrimethoxysilane was mixed with 1 kg of distilled water to obtain a silane mixed solution, and the alkali-resistant glass fiber was immersed in the mixed solution for 30 minutes to treat the surface of the alkali-resistant glass fiber;

[0046] After draining the silane mixed solution, the alkali-resistant glass fiber is rinsed with distilled water for 4 times to obtain rinsed alkali-resistant glass fiber;

[0047] The washed alkali-resistant glass fiber is placed in a drying oven at 90° C. and dried for 23 hours to obtain the modified alkali-resistant glass fiber.

[0048] The modified phosphate tailings sand is obtained by the following preparation method:

[0049] At 25°C, half of the total amount of unmodified phosphorus tailings sand was washed with anhydrous ethanol to remove impurities;

[0050] Place the cleaned unmodified phosphate tailings in a drying oven at 90°C and dry for 12 hours;

[0051] The dried unmodified phosphorus tailings sand was placed in a small muffle furnace and subjected to high temperature treatment at 850°C for 6 hours;

[0052] The treated unmodified phosphate tailings sand was allowed to stand at 25° C. for 12 hours, and finally mixed with the unmodified phosphate tailings sand to obtain modified phosphate tailings sand.

[0053] The particle size of the modified phosphate tailings sand is 0.25-0.50 mm, the internal radiation coefficient is 0.8, and the external radiation coefficient is 0.7.

[0054] Among them, the fluorine content in unmodified phosphate tailings sand accounts for 2.7% and the acid insoluble matter accounts for 22%.

[0055] The modified alkali-resistant glass fibers and modified phosphorus tailings sand in Example 1, Example 2, and Example 3 are all prepared by the above method.

[0056] Example 1

[0057] Alkali-resistant glass fiber tailings sand concrete is composed of the following raw materials in parts by weight: 1000g coarse aggregate, 100g fly ash, 500g river sand, 300g cement, 190g water, 400g modified phosphorus tailings sand, 90g iron tailings sand, 5g modified alkali-resistant glass fiber, 3g water reducer, and 1g cellulose ether.

[0058] Among them, the coarse aggregate is natural rock, pebble or mine waste rock processed by machinery, with a particle size between 5 and 20 mm; the fly ash is Class F fly ash, with a particle size range of 50 to 400 μm and a specific surface area of not less than 400 m 2 / kg; ordinary Portland cement is used, with a specific surface area of 370m 2 / kg, density 3.25g / cm 3Chemical composition: SiO2 accounts for 22.85%, Al2O3 accounts for 4.74%, Fe2O3 accounts for 3.26%, CaO accounts for 61.80%, MgO accounts for 0.85%, and SO3 accounts for 7.3%; Mineral components include: 3CaO·SiO2, 2CaO·SiO2, 3CaO·Al2O3, and 4CaO·Al2O3·Fe2O3; The 28-day compressive strength of the cement is not less than 42.5MPa; The particle size of the river sand is 0.30-4. 75mm; the iron tailings have a particle size of 0.1-0.5mm and have been magnetically separated and washed to remove impurities; the modified alkali-resistant glass fiber includes two types with a length of 9mm and 15mm, both with a single filament diameter of 20μm, a linear density of 8.12tex, a melting point of 169.0℃, a tensile strength of not less than 346.0MPa, and a breaking elongation of 30%, of which the content of 15mm length accounts for 80% of the total fiber content, and the content of 9mm length accounts for 20% of the total fiber content; the water reducer is a polycarboxylic acid water reducer.

[0059] Example 2

[0060] Alkali-resistant glass fiber tailings sand concrete is composed of the following raw materials in parts by weight: 1050g coarse aggregate, 125g fly ash, 520g river sand, 325g cement, 202g water, 420g modified phosphorus tailings sand, 100g iron tailings sand, 10g modified alkali-resistant glass fiber, 3g water reducer, and 1g cellulose ether.

[0061] Among them, the coarse aggregate is natural rock, pebble or mine waste rock processed by machinery, with a particle size between 5 and 20 mm; the fly ash is Class F fly ash, with a particle size range of 50 to 400 μm and a specific surface area of not less than 400 m 2 / kg; ordinary Portland cement is used, with a specific surface area of 370m 2 / kg, density 3.25g / cm 3Chemical composition: SiO2 accounts for 22.85%, Al2O3 accounts for 4.74%, Fe2O3 accounts for 3.26%, CaO accounts for 61.80%, MgO accounts for 0.85%, and SO3 accounts for 7.3%; Mineral components include: 3CaO·SiO2, 2CaO·SiO2, 3CaO·Al2O3, and 4CaO·Al2O3·Fe2O3; The 28-day compressive strength of the cement is not less than 42.5MPa; The particle size of the river sand is 0.30-4. 75mm; the iron tailings have a particle size of 0.1-0.5mm and have been magnetically separated and washed to remove impurities; the modified alkali-resistant glass fiber includes two types with a length of 9mm and 15mm, both with a single filament diameter of 20μm, a linear density of 8.12tex, a melting point of 169.0℃, a tensile strength of not less than 346.0MPa, and a breaking elongation of 30%, of which the content of 15mm length accounts for 80% of the total fiber content, and the content of 9mm length accounts for 20% of the total fiber content; the water reducer is a polycarboxylic acid water reducer.

[0062] Example 3

[0063] Alkali-resistant glass fiber tailings sand concrete is composed of the following raw materials in parts by weight: 1100g coarse aggregate, 150g fly ash, 540g river sand, 350g cement, 210g water, 430g modified phosphorus tailings sand, 110g iron tailings sand, 15g modified alkali-resistant glass fiber, 3g water reducer, and 1g cellulose ether.

[0064] Among them, the coarse aggregate is natural rock, pebble or mine waste rock processed by machinery, with a particle size between 5 and 20 mm; the fly ash is Class F fly ash, with a particle size range of 50 to 400 μm and a specific surface area of not less than 400 m 2 / kg; ordinary Portland cement is used, with a specific surface area of 370m 2 / kg, density 3.25g / cm 3Chemical composition: SiO2 accounts for 22.85%, Al2O3 accounts for 4.74%, Fe2O3 accounts for 3.26%, CaO accounts for 61.80%, MgO accounts for 0.85%, and SO3 accounts for 7.3%; Mineral components include: 3CaO·SiO2, 2CaO·SiO2, 3CaO·Al2O3, and 4CaO·Al2O3·Fe2O3; The 28-day compressive strength of the cement is not less than 42.5MPa; The particle size of the river sand is 0.30-4. 75mm; the iron tailings have a particle size of 0.1-0.5mm and have been magnetically separated and washed to remove impurities; the modified alkali-resistant glass fiber includes two types with a length of 9mm and 15mm, both with a single filament diameter of 20μm, a linear density of 8.12tex, a melting point of 169.0℃, a tensile strength of not less than 346.0MPa, and a breaking elongation of 30%, of which the content of 15mm length accounts for 80% of the total fiber content, and the content of 9mm length accounts for 20% of the total fiber content; the water reducer is a polycarboxylic acid water reducer.

[0065] Comparative Example 1

[0066] The only difference between this comparative example and Example 2 is that the phosphorus tailings sand is not modified, that is, there is no step of modifying the phosphorus tailings sand. Other raw materials and steps are the same as those in Example 2.

[0067] Comparative Example 2

[0068] The only difference between this comparative example and Example 2 is that the alkali-resistant glass fiber is not modified, that is, there is no step of modifying the alkali-resistant glass fiber. Other raw materials and steps are the same as those in Example 2.

[0069] Comparative Example 3

[0070] Compared with Example 2, the only difference between this comparative example is that all the iron tailings sand is replaced with modified phosphorus tailings sand, and the other raw materials and steps are the same as those in Example 2.

[0071] Billy 4

[0072] Compared with Example 2, the only difference between this comparative example is that the modified phosphorus tailings sand is completely replaced with iron tailings sand, and the other raw materials and steps are the same as those in Example 2.

[0073] Comparative Example 5

[0074] Compared with Example 2, the only difference between this comparative example is that the modified phosphorus tailings sand and iron tailings sand are all replaced with river sand, and the other raw materials and steps are the same as those in Example 2.

[0075] Comparative Example 6

[0076] The only difference between this comparative example and Example 2 is that the modified alkali-resistant glass fiber used is 15 mm, and the other raw materials and steps are the same as those in Example 2.

[0077] Comparative Example 7

[0078] The only difference between this comparative example and Example 2 is that the modified alkali-resistant glass fiber used is 9 mm, and the other raw materials and steps are the same as those in Example 2.

[0079] The various mechanical properties are tested in accordance with GB / T 50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete" and CECS13-2009 "Standard for Test Methods of Fiber Concrete".

[0080] Table 1 Properties of concrete prepared in each embodiment and each comparative example

[0081]

[0082]

[0083] It is worth noting that the contents not elaborated in detail in the present invention are all prior art and are well known to those skilled in the art.

[0084] Therefore, the present invention adopts the above-mentioned alkali-resistant glass fiber tailings sand concrete and its preparation method to prepare a new building material with better mechanical properties, green and environmentally friendly, which can realize the secondary utilization of solid waste and improve the comprehensive economic and ecological benefits.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An alkali-resistant glass fiber tailings sand concrete, characterized in that: The invention is composed of the following raw materials in parts by weight: 1000-1100g of coarse aggregate, 100-150g of fly ash, 500-540g of river sand, 300-350g of cement, 190-210g of water, 400-430g of modified phosphorus tailings, 90-110g of iron tailings, 5-15g of modified alkali-resistant glass fiber, 3g of water reducer, and 1g of cellulose ether; The modified alkali-resistant glass fiber includes two types of lengths: 9 mm and 15 mm. The monofilament diameter is 20 μm, the linear density is 8.12 tex, the melting point is 169.0°C, the tensile strength is not less than 346.0 MPa, and the breaking elongation is 30%. The content of the 15 mm length accounts for 80% of the total fiber content, and the content of the 9 mm length accounts for 20% of the total fiber content. The modified alkali-resistant glass fiber is obtained by the following preparation method: At 25° C., 1 kg of vinyltrimethoxysilane was mixed with 1 kg of distilled water to obtain a mixed solution, and the alkali-resistant glass fiber was immersed in the mixed solution for 30 minutes to treat the surface of the alkali-resistant glass fiber; After draining the mixed solution, the alkali-resistant glass fiber was rinsed with distilled water for 4 times to obtain rinsed alkali-resistant glass fiber; The washed alkali-resistant glass fiber is placed in a drying oven at 90°C and dried for 23 hours to obtain the modified alkali-resistant glass fiber; The modified phosphate tailings sand is obtained by the following preparation method: At 25°C, half of the total amount of unmodified phosphorus tailings sand was washed with anhydrous ethanol to remove impurities; Place the cleaned unmodified phosphate tailings in a drying oven at 90°C and dry for 12 hours; The dried unmodified phosphorus tailings sand was placed in a small muffle furnace and subjected to high temperature treatment at 850°C for 6 hours; The treated unmodified phosphate tailings sand was allowed to stand at 25°C for 12 hours, and finally mixed with the unmodified phosphate tailings sand to obtain modified phosphate tailings sand; The particle size of the modified phosphate tailings sand is 0.25-0.50 mm, the internal radiation coefficient is 0.8, and the external radiation coefficient is 0.7; Among them, the fluorine content in unmodified phosphate tailings sand accounts for 2.5-3%, and the acid-insoluble matter accounts for 22-23%.

2. The alkali-resistant glass fiber tailings sand concrete according to claim 1, characterized in that: Coarse aggregate is made from natural rocks, pebbles or mine waste rocks through mechanical processing, with a particle size between 5 and 20 mm.

3. The alkali-resistant glass fiber tailings sand concrete according to claim 1, characterized in that: The fly ash is Class F fly ash with a particle size range of 50 to 400 μm and a specific surface area of not less than 400 m 2 / kg.

4. The alkali-resistant glass fiber tailings sand concrete according to claim 1, characterized in that: The cement used is ordinary Portland cement with a specific surface area of 370m 2 / kg, density 3.25g / cm 3 ; Chemical composition: SiO2 accounts for 22.85%, Al2O3 accounts for 4.74%, Fe2O3 accounts for 3.26%, CaO accounts for 61.80%, MgO accounts for 0.85%, and SO3 accounts for 7.3%; Mineral components include: 3CaO·SiO2, 2CaO·SiO2, 3CaO·Al2O3 and 4CaO·Al2O3·Fe2O3; The 28-day compressive strength of the cement is not less than 42.5MPa.

5. The alkali-resistant glass fiber tailings sand concrete according to claim 1, characterized in that: The particle size of river sand is 0.30~4.75mm.

6. The alkali-resistant glass fiber tailings sand concrete according to claim 1, characterized in that: The iron tailings have a particle size of 0.1 to 0.5 mm and are magnetically separated and washed to remove impurities.

7. The alkali-resistant glass fiber tailings sand concrete according to claim 1, characterized in that: The water reducer is a polycarboxylic acid water reducer.

8. A method for preparing alkali-resistant glass fiber tailings sand concrete according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1: First, coarse aggregate and river sand weighed by weight are placed in a mixer and dry-mixed at a slow speed to make them uniform; Step S2: adding all the cement, fly ash, iron tailings and modified phosphorus tailings into a mixer and stirring slowly; Step S3: After stirring is completed, add water reducer and water and continue stirring at a slow speed; Step S4: After stirring evenly, add cellulose ether and continue stirring slowly; Step S5: adding the modified alkali-resistant glass fiber into a blender and rapidly stirring to obtain a stirred slurry; Step S6: pouring the stirred slurry into a mold, vibrating it into shape, and sealing it with a plastic film. After demoulding, the mold is removed and the slurry is cured at room temperature for 28 days to obtain alkali-resistant glass fiber tailings sand concrete.

9. The method for preparing alkali-resistant glass fiber tailings sand concrete according to claim 8, characterized in that: In step S1, the slow dry mixing time is 1 to 2 minutes; in step S2, the slow stirring time is 1 to 3 minutes; in step S3, the slow stirring time is 2 to 3 minutes; in step S4, the slow stirring time is 1 to 2 minutes; in step S5, the rapid stirring time is 3 to 5 minutes; in step S6, the vibration time is 5 to 7 minutes.

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