A kind of concrete doped with solid waste fibers and its preparation method

Abstract

The invention discloses a kind of concrete doped with solid waste fiber and preparation method thereof, by mass fraction, preparation raw materials include:320 520 parts of cement, 480 1000 parts of fly ash, 100 400 parts of quartz sand, 2200 2400 parts of water, 10 30 parts of PVA fibers, 5 15 parts of water reducers, 5 15 parts of thickeners, 100 400 parts of carbonized solid waste materials;The carbonized solid waste materials are obtained by carbonizing 50 150 parts of recycled concrete micropowder, 50 100 parts of nickel-iron slag, and 1 5 parts of ether compounds. The present invention carries out carbonization treatment on recycled concrete micropowder, by regulating the ratio of recycled aggregate and nickel-iron slag, and the ratio of calcite and aragonite whisker controlled by the concentration of methyl ether or ether, replaces quartz sand and PVA fibers, improves recycled concrete micropowder surface performance, and the fine aggregate used is to protect environment, reduce resource waste and have more important significance.

Description

Technical Field

[0001] The present invention belongs to the field of concrete materials, and particularly relates to a concrete doped with solid waste fibers and a preparation method thereof. Background Art

[0002] Engineered Cementitious Composites (ECC) is a fiber-reinforced composite material based on the design principle of meso-mechanics, with cement, quartz sand, etc. as the matrix. Compared with ordinary concrete, it has high strength, high toughness, high crack resistance and high damage resistance. The cost of PVA fibers and quartz sand in ECC concrete is relatively high. If solid waste can be used to prepare fibers to replace PVA and quartz sand, the cost can be reduced, and it is low-carbon and environmentally friendly.

[0003] Recycled concrete aggregate is processed from concrete, mortar, stones, bricks and tiles in construction (structure) waste, and is a particle used to prepare concrete, abbreviated as recycled aggregate. Among them, the part with a particle size less than 600μm is recycled concrete powder, which mainly contains cement hydration products. The use of recycled concrete powder fully meets the three meanings of "green": (1) saving resources and energy; (2) environmental friendliness; (3) sustainable development, which can not only meet the needs of contemporary people, but also not harm the ability of future generations to meet their needs. Among them, the content of old cement paste in recycled concrete powder is higher, and its water absorption is relatively stronger than that of recycled coarse aggregate. Therefore, directly applying it to concrete will have an adverse impact on the performance, so the utilization rate of recycled concrete powder is relatively low.

[0004] CN117819893A discloses a green hybrid fiber toughened iron tailing sand concrete material and a preparation method thereof. The mixing ratio design of each component is by mass fraction: water: 170 parts, cement: 358 parts, fly ash: 89 parts, iron tailing sand: 624 parts, crushed stone: 1159 parts, water reducing agent: 3.6 parts, recycled tire steel fiber: 39 parts, coconut shell fiber: 2.3 parts; Firstly, the equipment investment is large. Special treatment equipment is required for recycling steel fibers and coconut shell fibers, which increases the difficulty of the preparation process and the production cost; Secondly, the preparation process is complex. For example, the steel fibers in waste tires are tightly combined with materials such as rubber and nylon, and need to go through multiple processes such as cutting, crushing, and magnetic separation to be completely separated; In addition, the raw material supply is limited. For example, coconut shells contain more impurities such as lignin and hemicellulose, and need to be pretreated with alkali, which may cause certain pollution to the environment and increase the production cost.

[0005] With the rapid development of my country's industry, nickel production has remained high, exceeding 200,000 tons annually. However, every ton of nickel produced generates approximately 6-16 tons of ferronickel slag. Because ferronickel slag is an industrial waste, direct landfilling places significant pressure on the environment. The main components of ferronickel slag are silicon oxide, magnesium oxide, calcium oxide, iron oxide, and aluminum oxide. Its composition is similar to that of cement, so if it can be used in concrete, it can achieve solid waste recycling. Summary of the invention

[0006] The present invention provides a concrete doped with solid waste fibers. Recycled concrete powder and nickel-iron slag are carbonized to synthesize fibers, which are applied to ECC to partially replace quartz sand and PVA fibers, achieving the goals of low carbon, environmental protection, and cost reduction, while producing concrete with high ductility.

[0007] This invention provides a concrete doped with solid waste fibers. This concrete primarily utilizes carbonization to treat recycled concrete powder and nickel-iron slag to produce calcite and fibrous aragonite, which replace quartz sand and PVA fibers, respectively. This reduces material production costs, recycles solid waste, and absorbs carbon dioxide. The addition of methyl ether or ethyl ether allows the ratio of calcite to aragonite to be controlled, thereby regulating the concrete's mechanical properties.

[0008] The technical solution adopted in the present invention is as follows:

[0009] A concrete doped with solid waste fibers, wherein the raw materials for preparation include, by weight:

[0010] 320-520 parts of cement, 480-1000 parts of fly ash, 100-400 parts of quartz sand, 2200-2400 parts of water, 10-30 parts of PVA fiber, 5-15 parts of water reducer, 5-15 parts of thickener, and 100-400 parts of carbonized solid waste material; the carbonized solid waste material is obtained by carbonizing 50-150 parts of recycled concrete powder, 50-100 parts of nickel-iron slag, and 1-5 parts of an ether compound.

[0011] The carbonized solid waste material is composed of calcite and aragonite whiskers, and the mass ratio of the two is (5-10):1. The concrete prepared with a ratio of 6.2~7:1 has the highest toughness. The more preferred ratio of calcite and aragonite whiskers is 6.2:1.

[0012] The total amount of carbonized solid waste material and quartz sand in the concrete is 100-400 parts, the mass ratio of carbonized solid waste material to quartz sand is 1-3:1-3, and preferably the mass ratio of carbonized solid waste material to quartz sand is 1:1.

[0013] The ether compound is at least one of methyl ether, ethyl ether, dimethyl ether or ethylene oxide.

[0014] Preferably methyl ether or ethyl ether.

[0015] The cement is ordinary Portland cement P.O42.5;

[0016] The fly ash is class I fly ash with a calcium oxide content of less than 10%;

[0017] The particle size range of the quartz sand is 10 - 600 μm, and the average particle size is 100 - 140 μm;

[0018] The PVA fiber has a length of 9 - 15 mm, a diameter of 30 - 40 μm, and a density of 1.2 - 1.4 g / cm 3 ;

[0019] The water - reducing agent is a polycarboxylate - based water - reducing agent with a water - reducing efficiency of more than 20%;

[0020] The thickening agent is hydroxypropyl methylcellulose;

[0021] The diameter of the recycled concrete fine powder is less than 600 μm, and the particle size of the nickel - iron slag is 0.5 - 200 μm.

[0022] The present invention also provides a method for preparing concrete doped with solid waste fibers, comprising the following steps:

[0023] 1), Carbonization treatment of solid waste materials: Place the solid waste materials in water, introduce carbon dioxide, add an ether compound, stir the mixture, heat and maintain it at 60 - 90 °C, after the reaction lasts for 1 - 4 h, centrifuge the solution, take out the solid product, and dry it for standby; the solid waste materials are recycled concrete fine powder and nickel - iron slag;

[0024] 2) Preparation of fiber - reinforced concrete:

[0025] Put the fly ash and cement into a mixer, stir at low speed until evenly mixed, then add water and the water - reducing agent, stir at high speed until evenly mixed, then add the quartz sand and carbonized solid waste materials, stir at low speed until evenly mixed, then add the PVA fiber, stir at high speed, finally add the thickening agent, stir at high speed, finally pour into a mold, cure and demold at room temperature, and then place it in a curing room with a humidity of 95% ± 2% and a temperature of 20 °C ± 2 °C for curing for 28 d.

[0026] In step 1), the solid - liquid ratio of the solid waste materials to water is 50 - 100 g / L, and the mass ratio of the recycled concrete fine powder to the nickel - iron slag in the solid waste materials is (1 - 3):1.

[0027] In step 1), the concentration of the ether compound is 10 - 30 mmol / L.

[0028] In step 1), the carbon dioxide ventilation volume is 0.1 - 0.3 L / min / 100 mL.

[0029] In step 2), the low-speed stirring speed is 100 - 150 revolutions per minute, and the high-speed stirring speed is 200 - 300 revolutions per minute.

[0030] More specifically,

[0031] Carbonization treatment of solid waste materials: Place recycled concrete powder and nickel iron slag in water, introduce carbon dioxide, and add methyl ether or ethyl ether (concentration 10 - 30 mmol / L); stir the mixture (stirring speed 400 - 600 r / min), heat and maintain at 80 °C. After the reaction continues for 1 - 4 h, centrifuge the solution, take out the solid product, and dry it for standby.

[0032] In the present invention, cubic calcite and aragonite whiskers are generated after the carbonization treatment of solid waste materials. Calcite replaces quartz sand, and aragonite replaces PVA fibers. By adjusting the ratio of recycled concrete powder to nickel iron slag and the concentration of methyl ether or ethyl ether, the ratio of the two can be controlled;

[0033] The mass ratio of recycled concrete powder to nickel iron slag is (1 - 3):1; preferably, the mass ratio of recycled concrete powder to nickel iron slag is 1:1.

[0034] When the ratio of recycled concrete fine powder to nickel iron slag increases, the ratio of calcite to aragonite generated increases, and the aragonite content decreases. Therefore, the axial tensile strength and axial tensile strain decrease. Therefore, the ratio of recycled concrete fine powder to nickel iron slag is selected as 1.

[0035] During the carbonization process, when methyl ether is added, methyl ether will affect the morphology of the generated calcium carbonate and promote the formation of aragonite. However, it is not that the higher the content of methyl ether, the more aragonite is generated. When the methyl ether content is 10 mmol / L, the most aragonite is generated, and the axial tensile strength and strain of the prepared concrete are the highest. Therefore, the methyl ether content of 10 mmol / L is selected.

[0036] Preparation of fiber-reinforced concrete:

[0037] Put fly ash and cement into a mixer, stir at low speed (100 - 150 revolutions per minute) for 2 minutes, then add water and water reducer, stir at high speed (200 - 300 revolutions per minute) for about two minutes, then add quartz sand and carbonized solid waste materials, stir at low speed (100 - 150 revolutions per minute) for 2 minutes, then add PVA fibers, stir at high speed for five minutes, finally add a thickening agent, stir at high speed (200 - 300 revolutions per minute) for five minutes, finally pour into a mold, cure at room temperature for 24 hours and then demold, and then cure in a curing room at a humidity of 95% ± 2% and a temperature of 20 °C ± 2 °C for 28 d.

[0038] Using recycled concrete powder and solid waste materials such as nickel iron slag, cubic calcite and aragonite whiskers are formed after carbonization treatment. When added to ECC concrete, calcite replaces quartz sand and aragonite replaces PVA fiber, thereby reducing the production cost of ECC and recycling solid waste at the same time. At the same time, carbon dioxide is applied in the process of carbonizing solid waste materials, which can achieve the purpose of carbon reduction.

[0039] The carbonization process of recycled concrete powder and nickel iron slag is carried out in water at 80 degrees, and aragonite whiskers can be stably and continuously generated. The aragonite whiskers can replace PVA fiber. In addition, granular calcite is formed, which can replace quartz sand.

[0040] The hydration products (calcium hydroxide and C-S-H gel) in the recycled concrete powder react with carbon dioxide to form calcite calcium carbonate.

[0041]

[0042] After adding nickel iron slag, nickel iron slag dissolves in water to generate magnesium ions. Under the influence of magnesium ions, the generated calcium carbonate is in the fibrous aragonite form. Because there are two kinds of calcium carbonate in the solution, calcite replaces quartz sand and aragonite whiskers replace PVA fiber. By controlling the ratio of nickel iron slag to recycled concrete powder, as well as adding methyl ether and ethyl ether, the ratio of aragonite and calcite is adjusted to control the performance of concrete.

[0043] Changing the ratio of carbonized solid products replacing quartz sand and fibers will affect the axial tensile strength and axial tensile ultimate strain of concrete. Too much or too little content of carbonized solid products has an adverse effect on the toughness of concrete. The axial tensile strength and axial tensile ultimate strain reach the highest when the content is 50%.

[0044] Preferably, a kind of concrete doped with solid waste fiber, calculated by mass parts, the preparation raw materials include:

[0045] 420 parts of cement, 630 parts of fly ash, 190 parts of quartz sand, 2200 - 2400 parts of water, 10 parts of PVA fiber, 10 parts of water reducing agent, 10 parts of thickening agent, 190 parts of carbonized solid waste material; the carbonized solid waste material is obtained by carbonizing 50 parts of recycled concrete powder, 50 parts of nickel iron slag and methyl ether, and the mass ratio of calcite and aragonite whiskers in the carbonized solid waste material is 6.2:1.

[0046] Beneficial effects

[0047] (1)The present invention carbonizes recycled concrete powder, controls the ratio of calcite and aragonite whiskers by adjusting the ratio of recycled aggregate to nickel iron slag and the concentration of methyl ether or ethyl ether, replaces quartz sand and PVA fiber, improves the surface performance of recycled concrete powder, and does not reduce the strength of concrete when added to concrete. Therefore, the fine aggregate used in the present invention is of great significance for environmental protection and reduction of resource waste.

[0048] (2)Low cost. Recycled concrete powder and nickel iron slag are solid wastes, and the products generated after carbonization can replace quartz sand and PVA fiber, greatly reducing the cost while ensuring the original high toughness characteristics of ECC.

[0049] (3)During the carbonization process of solid waste in the present invention, carbon dioxide gas is absorbed to form solid products. The content of carbon dioxide in the atmosphere is reduced, carbon is stabilized in solid materials, and the carbon emission of concrete is reduced. Specific embodiments

[0050] The present invention provides a concrete doped with solid waste fiber, mainly using carbonized recycled concrete powder and nickel iron slag to generate fibrous aragonite to replace PVA fiber and generate calcite to replace quartz sand, thereby reducing the production cost of materials, recycling solid waste, and absorbing carbon dioxide at the same time.

[0051] The sources of raw materials used in the following examples are as follows:

[0052] The cement is ordinary Portland cement P.O42.5 from Hunan Pingtang Southern Cement Co., Ltd.;

[0053] The fly ash is first-class fly ash with a calcium oxide content of less than 10% from Shandong Jining Thermal Power Plant;

[0054] The particle size range of quartz sand is 10 - 600 μm, and the average particle size is 100 - 140 μm;

[0055] The PVA fiber is REC15 type PVA fiber produced by Kuraray Co., Ltd. of Japan, with a length of 9 - 15 mm, a diameter of 30 - 40 μm, and a density of 1.2 - 1.4 g / cm 3 ;

[0056] The water reducer is Nanjing Supote SBTJM series polycarboxylate water reducer with a water reduction efficiency of more than 20%;

[0057] The thickener is hydroxypropyl methyl cellulose;

[0058] The recycled concrete powder is prepared by crushing and screening laboratory waste concrete; the nickel iron slag comes from a nickel iron smelting enterprise in Fujian Province.

[0059] Example 1 (control group)

[0060] Put 630 parts of fly ash and 420 parts of cement into a mixer and stir at a low speed (120 revolutions per minute) for 2 minutes. Then add 315 parts of water and 10 parts of water reducer, and stir at a high speed (250 revolutions per minute) for about two minutes. Then add 380 parts of quartz sand, stir at a low speed (120 revolutions per minute) for 2 minutes, add 20 parts of PVA fiber, stir at a high speed for five minutes, finally add 10 parts of thickener, stir at a high speed (250 revolutions per minute) for five minutes, finally pour into a mold, cure at room temperature for 24 hours and then remove the mold, and then cure in a curing room with a humidity of 95% ± 2% and a temperature of 20°C ± 2°C for 28 days.

[0061] Example 2

[0062] (1) Carbonization process: Put 50 parts of recycled concrete powder and 50 parts of nickel-iron slag into 2000 g of water, and introduce carbon dioxide (ventilation volume 0.2 L / min / 100 mL). Stir the mixture (stirring speed 600 r / min), heat and maintain at 80°C. After the reaction lasts for 2 h, centrifuge the solution, take out the solid product, and dry it for standby.

[0063] The concrete preparation process includes the following steps:

[0064] (2) Put 630 parts of fly ash and 420 parts of cement into a mixer and stir at a low speed (120 revolutions per minute) for 2 minutes. Then add 315 parts of water and 10 parts of water reducer, and stir at a high speed (250 revolutions per minute) for about two minutes. Then add 190 parts of quartz sand and 190 parts of the carbonized solid product prepared in (1), stir at a low speed (120 revolutions per minute) for 2 minutes, add 10 parts of PVA fiber, stir at a high speed for five minutes, finally add 10 parts of thickener, stir at a high speed (250 revolutions per minute) for five minutes, finally pour into a mold, cure at room temperature for 24 hours and then remove the mold, and then cure in a curing room with a humidity of 95% ± 2% and a temperature of 20°C ± 2°C for 28 days.

[0065] Example 3

[0066] The carbonization process and concrete preparation process of this example are similar to those of Example 2, except that the dosages of recycled concrete powder and nickel-iron slag are 66.7 parts and 33.3 parts respectively.

[0067] Example 4

[0068] The carbonization process and concrete preparation process of this example are similar to those of Example 2, except that the dosages of recycled concrete powder and nickel-iron slag are 75 parts and 25 parts respectively.

[0069] Example 5

[0070] The carbonization process and the concrete preparation process in this example are similar to those in Example 2, except that 10 mmol / L of methyl ether is added during the carbonization process.

[0071] Carbonization process: Place 50 parts of recycled concrete powder and 50 parts of nickel iron slag in 2000 g of water, introduce carbon dioxide (ventilation rate 0.2 L / min / 100 mL), and add methyl ether (concentration 10 mmol / L, and the methyl ether is added until the concentration of methyl ether in the solution is 10 mmol / L). Stir the mixture (stirring speed 600 r / min), heat and maintain at 80 °C. After the reaction lasts for 2 h, centrifuge the solution, take out the solid product, and dry it for standby.

[0072] Example 6

[0073] The carbonization process and the concrete preparation process in this example are similar to those in Example 5, except that 20 mmol / L of methyl ether is added during the carbonization process.

[0074] Example 7

[0075] The carbonization process and the concrete preparation process in this example are similar to those in Example 5, except that 30 mmol / L of methyl ether is added during the carbonization process.

[0076] Example 8

[0077] The carbonization process and the concrete preparation process in this example are similar to those in Example 5, except that 10 mmol / L of ethyl ether is added during the carbonization process.

[0078] Example 9

[0079] The carbonization process and the concrete preparation process in this example are similar to those in Example 5, except that 20 mmol / L of ethyl ether is added during the carbonization process.

[0080] Example 10

[0081] The carbonization process and the concrete preparation process in this example are similar to those in Example 5, except that 30 mmol / L of ethyl ether is added during the carbonization process.

[0082] Example 11

[0083] The carbonization process and the concrete preparation process in this example are similar to those in Example 5, except that 285 parts of quartz sand, 15 parts of PVA fiber, and 95 parts of carbonized solid product are added during the concrete preparation process.

[0084] The concrete preparation process includes the following steps:

[0085] Put 630 parts of fly ash and 420 parts of cement into a mixer and stir at a low speed (120 revolutions per minute) for 2 minutes. Then add 315 parts of water and 10 parts of water reducer and stir at a high speed (250 revolutions per minute) for about two minutes. Then add 285 parts of quartz sand and 95 parts of carbonized solid product, and stir at a low speed (120 revolutions per minute) for 2 minutes. Then add 15 parts of PVA fiber and stir at a high speed for five minutes. Finally, add 10 parts of thickener and stir at a high speed (250 revolutions per minute) for five minutes. Finally, pour into a mold, cure at room temperature for 24 hours and then demold, and then cure in a curing room at a humidity of 95% ± 2% and a temperature of 20°C ± 2°C for 28 days.

[0086] Example 12

[0087] The carbonization process and the concrete preparation process in this example are similar to those in Example 5, except that 95 parts of quartz sand, 5 parts of PVA fiber, and 285 parts of carbonized solid product are added during the concrete preparation process.

[0088] Use an X-ray diffractometer to test the content and ratio of calcite and aragonite in the carbonized solid waste product, and conduct performance tests on the concrete materials prepared in the above examples according to the standard "Standard for Test Methods of Physical and Mechanical Properties of Concrete" GB / T 50081-2019, including indexes such as axial tensile strength and axial tensile ultimate strain. The results are shown in Table 1.

[0089] Table 1

[0090]

[0091] It can be seen from Examples 1, 2, 3, 4, and 5 that when carbonized solid waste materials are used to replace quartz sand and PVA fiber, the cost is greatly reduced. When the ratio of recycled concrete fine powder to nickel iron slag increases, the ratio of calcite to aragonite generated increases, and the aragonite content decreases. Therefore, the axial tensile strength and axial tensile strain decrease. Therefore, the ratio of recycled concrete fine powder to nickel iron slag is selected as 1.

[0092] It can be seen from Examples 2, 5, 6, and 7 that when dimethyl ether is added during the carbonization process, dimethyl ether will affect the morphology of the generated calcium carbonate and promote the formation of aragonite. However, the higher the content of dimethyl ether, the more aragonite is not generated. When the dimethyl ether content is 10 mmol / L, the most aragonite is generated, and the axial tensile strength and strain of the prepared concrete are the highest. Therefore, the dimethyl ether content of 10 mmol / L is selected.

[0093] It can be seen from Examples 5, 11, and 12 that changing the ratio of carbonized solid product to replace quartz sand and fiber will affect the axial tensile strength and axial tensile ultimate strain of the concrete. Too much or too little content of carbonized solid product has an adverse effect on the toughness of the concrete. When the content is 50%, the axial tensile strength and axial tensile ultimate strain reach the highest. Therefore, Example 5 is recommended as the optimal mix ratio.

[0094] As can be seen from Examples 5-10, dimethyl ether and diethyl ether have different effects on the formation ratio and aspect ratio of calcite and aragonite. Comparatively speaking, dimethyl ether is more conducive to the formation of calcite, while diethyl ether is more conducive to the formation of aragonite. However, at the same time, the content of dimethyl ether and diethyl ether has a great influence on the aspect ratio of aragonite. If too much or too little is incorporated, the aspect ratio of the generated aragonite is relatively small. This is why the ratio of calcite to aragonite in Examples 7 and 9 is the same, but the toughness of the concrete is different.

Claims

1. A concrete doped with solid waste fibers, characterized in that, Comprising by mass parts: 320 - 520 parts of cement, 480 - 1000 parts of fly ash, 100 - 400 parts of quartz sand, 2200 - 2400 parts of water, 10 - 30 parts of PVA fiber, 5 - 15 parts of water reducing agent, 5 - 15 parts of thickening agent, 100 - 400 parts of carbonized solid waste material; the carbonized solid waste material is a mixture of calcite and aragonite whiskers obtained by carbonizing 50 - 150 parts of recycled concrete powder, 50 - 100 parts of nickel iron slag, and 1 - 5 parts of ether compound; the mass ratio of calcite to aragonite whiskers in the carbonized solid waste material is (5 - 10):1; The preparation method of the carbonized solid waste material is: placing the solid waste material in water, introducing carbon dioxide, adding an ether compound, stirring the mixture, heating and maintaining it at 60 - 90 °C, after reacting for 1 - 4 h, centrifuging the solution, taking out the solid product, and drying to obtain the carbonized solid waste material; The ether compound is methyl ether or ethyl ether; The diameter of the recycled concrete powder is less than 600 μm, and the particle size of the nickel iron slag is 0.5 - 200 μm.

2. The concrete doped with solid waste fibers according to claim 1, wherein The water reducing agent is a polycarboxylate water reducing agent, and the thickening agent is hydroxypropyl methyl cellulose.

3. The preparation method of the doped solid waste fiber concrete according to claim 1 or 2, characterized in that, Including the following steps: 1), Carbonization treatment of solid waste material: placing the solid waste material in water, introducing carbon dioxide, adding an ether compound, stirring the mixture, heating and maintaining it at 60 - 90 °C, after reacting for 1 - 4 h, centrifuging the solution, taking out the solid product, and drying to obtain the carbonized solid waste material; the solid waste material is recycled concrete powder and nickel iron slag; 2) Preparation of fiber - reinforced concrete: Putting fly ash and cement into a mixer, stirring and mixing them at a low speed, then adding water and a water reducing agent, stirring and mixing them at a high speed, then adding quartz sand and the carbonized solid waste material, stirring and mixing them at a low speed, then adding PVA fiber, stirring at a high speed, adding a thickening agent, stirring at a high speed, and finally pouring into a mold, and curing, demolding, and maintaining at room temperature.

4. The preparation method of the doped solid waste fiber concrete according to claim 3, characterized in that, In step 1), the solid - liquid ratio of the solid waste material to water is 50 - 100 g / L, and the mass ratio of recycled concrete powder to nickel iron slag in the solid waste material is (1 - 3):

1.

5. The preparation method of the doped solid waste fiber concrete according to claim 3, characterized in that, In step 1), the concentration of the ether compound is 10 - 30 mmol / L.

6. The preparation method of the doped solid waste fiber concrete according to claim 3, characterized in that, In step 1), the carbon dioxide ventilation volume is 0.1 - 0.3 L / min / 100 mL.

7. The preparation method of the doped solid waste fiber concrete according to claim 3, characterized in that, In step 2), the low - speed stirring speed is 100 - 150 revolutions per minute, and the high - speed stirring speed is 200 - 300 revolutions per minute.

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