Steel bar tailings ultra-high performance concrete electric pole and manufacturing method thereof

Abstract

The application relates to the technical field of concrete electric poles, in particular to a steel rod tailing super-high-performance concrete electric pole and a manufacturing method thereof, and the manufacturing method comprises the following steps of: S1. mixing slag, fly ash and silicon powder, stirring at a rotating speed of 200-300 r / min for 15-20 min to obtain required mixed materials; S2. mixing the mixed materials obtained in the step S1 and modified tailing sand according to a proportion of 1:1, adding steel fibers, polyvinyl alcohol fibers, borax and a modified alkali activator, uniformly mixing and stirring to obtain tailing concrete; S3. pouring the prepared concrete into an electric pole mold, placing the electric pole mold on a vibrating table to vibrate for 3-5 min, demolding after curing the electric pole mold at normal temperature for 20-24 h after the electric pole mold is filled, placing the test block after demolding into a curing box, curing the test block at a relative humidity of 85-90% and a room temperature of 15-25 DEG C for 7-8 days, and obtaining the steel rod tailing super-high-performance concrete electric pole. The application has high compressive strength under the condition of normal temperature curing, simple manufacturing process, small environmental pollution and excellent performances such as fire resistance and high-temperature resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete electric poles, in particular to a steel rod tailing ultra-high performance concrete electric pole and a manufacturing method thereof. BACKGROUND

[0002] The polymer raw material is conducive to the sustainable development of the construction industry. The polymer is a new type of cementing material with a zeolite-like structure, which is formed through a "dissolution-monomer reconstitution-polycondensation" reaction and hardening process at room temperature or under certain curing conditions, using silica-alumina raw materials and activators. The "activator" can be an alkali silicate solution, sodium hydroxide solution, potassium hydroxide solution, or phosphoric acid solution, etc. Its energy-saving and environmentally friendly characteristics in the preparation process make it have greater advantages compared with ordinary Portland cement, and it is widely used in building materials, fire retardant coatings, fiber reinforced composites, solidification of chemical pollution and radioactive waste, etc. Therefore, it is considered as the third generation of cement materials after lime and ordinary Portland cement.

[0003] Tailing generally has problems such as strong pH value (strong acid or strong base), high salinity, poor soil structure, lack of nutrients, and containing heavy metals. The raw materials of tailing concrete are widely available and low in price, and are mostly industrial waste residues containing silica-alumina minerals. The preparation process of tailing concrete is simple, and does not require the "two grinding and one burning" process of producing cement, produces less waste, and can reduce carbon emissions by 80-90% compared with Portland cement, thereby contributing to the green and sustainable development of energy saving and environmental protection. A new type of concrete material with environmental protection, low cost and good mechanical properties is prepared by replacing natural coarse and fine aggregates in UHPC with tailing materials of different particle sizes to prepare electric poles. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a steel rod tailing ultra-high performance concrete electric pole and a manufacturing method thereof.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] The steel rod tailing ultra-high performance concrete electric pole comprises the following components by mass fraction:

[0007] 551-641 parts of slag, 200-214 parts of fly ash, 45-50 parts of silica powder, 800-900 parts of modified tailing sand, 78-156 parts of steel fiber, 22-25 parts of borax (borax meets the GB / T 537-2009 standard, content ≥95%) and 359-425 parts of modified alkali activator, and 20-30 parts of polyvinyl alcohol fiber;

[0008] The preparation of the modified alkali activator comprises the following steps:

[0009] S21. 45-50 parts of nano lithium silicate was added into 140-145 parts of 30% sodium hydroxide by mass fraction, and ultrasonic dispersion was carried out at a frequency of 40 kHz for 20-25 min;

[0010] S22. 10-15 parts of excitation modifier, 3-5 parts of diethylene triamine pentaethylene phosphonic acid, and 0.3-0.5 parts of sodium gluconate were sequentially added into the solution obtained in step S21, and stirring was carried out at a rotation speed of 300-350 r / min for 10-20 min;

[0011] S23. The mixed solution obtained in step S22 was stirred at a rotation speed of 500 r / min for 1.5-2 h under the condition of a water bath at 90-95 °C, and then cooled to 40-45 °C to obtain a modified alkali excitation agent.

[0012] Preferably, the preparation of the excitation modifier comprises the following steps:

[0013] S221. 35-40 parts of triethanolamine and 15-20 parts of polyether amine were added into a reaction kettle, and stirring was carried out at a rotation speed of 300-350 r / min for 10-15 min at 40-45 °C to obtain a preliminary excitation agent;

[0014] S222. 12-15 parts of tetrabutyl titanate was slowly added into the preliminary excitation agent obtained in step S221 at a speed of 1 mL / min, and after the dropwise addition was completed, the temperature was increased to 75-80 °C and reacted for 50-60 min to obtain a secondary excitation agent;

[0015] S223. 3-5 parts of γ-aminopropyl triethoxysilane and 17-20 parts of anhydrous ethanol were added into the secondary excitation agent, and after continuous reaction at 55-60 °C for 25-30 min, an excitation modifier was obtained.

[0016] Preferably, the preparation of the modified tailings sand comprises the following steps:

[0017] S11. 0.5-1 parts of γ-(2,3-epoxypropoxy) propyl trimethoxysilane and 0.2-0.4 parts of mercaptopropyl methyl dimethoxysilane were added into 20-22 parts of anhydrous ethanol, and hydrolysis was carried out for 25-30 min by adjusting the pH to 4-5 with acetic acid to obtain a silane modifier;

[0018] S12. 800-900 parts of tailings sand and 30-45 parts of tailings powder were mixed, and drying was carried out at 100-105 °C for 1-2 h to obtain a tailings mixture;

[0019] S13. The silane modifier obtained in step S11 was sprayed into the tailings mixture, and stirring was carried out at a rotation speed of 600-700 r / min for 10-15 min;

[0020] S14. Adding 0.1-0.3 parts of nano cerium oxide to the mixture obtained in step S13, continuing to stir for 15-20 min, and hot air curing at 75-80°C for 50-60 min to obtain the modified tailings sand.

[0021] Preferably, the specific surface area of the slag is 430-450 m 2 / kg, wherein the content of silicon dioxide is 33-35%, the content of calcium oxide is 38-40%, and the remaining components are aluminum oxide.

[0022] Preferably, the specific surface area of the silicon powder is 19600-19640 m 2 / kg, wherein the content of silicon dioxide is 94-95%, and the remaining components are iron oxide.

[0023] Preferably, the steel fiber is flat, with a length of 11-15 mm, an equivalent diameter of 1-1.2 mm, and a tensile strength of ≥600 MPa.

[0024] Preferably, the tailings powder is a clinker obtained after high-temperature calcination of tailings sand, with a mesh size of 200 mesh.

[0025] Preferably, the tailings sand is tailings waste collected from a tailings field, and is continuously graded with a continuous particle size of 80-325 mesh, a content of silicon dioxide of 60-65%, a content of aluminum oxide of 10-20%, and the remaining components being iron oxide.

[0026] Preferably, the frequency of ultrasonic dispersion in step S21 is 40 kHz.

[0027] The method for manufacturing the steel bar tailings ultra-high performance concrete pole is used to manufacture the steel bar tailings ultra-high performance concrete pole described above, and comprises the following steps:

[0028] S1. Mixing 551-641 parts of slag, 200-214 parts of fly ash, and 45-50 parts of silicon powder by mass fraction, stirring at a speed of 200-300 r / min for 15-20 min to obtain the required mixture;

[0029] S2. Mixing the mixture obtained in step S1 and the modified tailings sand in a ratio of 1:1, adding 78-156 parts of steel fiber, 20-30 parts of polyvinyl alcohol fiber, 22-25 parts of borax, and 359-425 parts of modified alkali activator, and uniformly mixing and stirring to obtain tailings concrete;

[0030] S3. Pouring the prepared concrete into a pole mold and placing it in a vibrating table for 3-5 min, demolding after curing at room temperature for 20-24 h after molding, and placing the demolded test block in a curing box for curing at a relative humidity of 85-90% and a room temperature of 15-25°C for 7-8 days to obtain a steel bar tailings ultra-high performance concrete pole.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] 1. This invention can achieve high compressive strength under normal temperature curing conditions, has a simple manufacturing process, low environmental pollution, and excellent properties such as fire resistance and high temperature resistance. It significantly reduces energy consumption and equipment costs, makes the production process more energy-efficient, and significantly reduces pollution from natural sand and gravel mining and solid waste storage. The alkali-activated cementitious system replaces cement, and only the production of alkali-activated materials requires hot water mixing. Hot water energy consumption accounts for about 10-20% of the total energy consumption of traditional cement, reducing carbon emissions in the production process by 80-90% and reducing dust, SO2 and CO2 emissions from the source.

[0033] 2. This invention forms a dense aluminosilicate gel structure through the synergistic effect of modified alkali activator and activation modifier, which significantly improves early strength. At the same time, it forms a multi-scale reinforcing network with steel fiber and polyvinyl alcohol fiber to synergistically improve crack resistance, toughness and impact resistance. Attached Figure Description

[0034] Figure 1 This is a flowchart of the preparation process of the present invention;

[0035] Figure 2 This is a process flow diagram for preparing the modified tailings sand of the present invention;

[0036] Figure 3 This is a process flow diagram for preparing the modified alkali activator of the present invention;

[0037] Figure 4 This is a process flow diagram for preparing the activation modifier of the present invention;

[0038] Figure 5 Line graphs showing the effect of modified tailings sand content on compressive strength in Examples 1 and Comparative Examples 2-4 of the present invention. Detailed Implementation

[0039] The present invention will now be clearly and completely described in conjunction with embodiments thereof. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] Please see Figures 1-5 The present invention provides a technical solution:

[0041] Example 1

[0042] Method for fabricating ultra-high performance concrete poles using steel bar tailings:

[0043] Before fabricating ultra-high performance concrete poles using steel bar tailings, the following steps are taken: preparation of activating modifier, modified alkali activator, and modified tailings sand.

[0044] The preparation of the activating modifier includes the following steps:

[0045] S221. Add 35g of triethanolamine and 15g of polyetheramine to the reactor and stir at 300r / min for 10min at 40℃ to obtain a preliminary activator;

[0046] S222. Slowly add 12g of tetrabutyl titanate to the preliminary activator obtained in step S221 at a rate of 1mL / min. After the addition is completed, heat to 75℃ and react for 50min to obtain the secondary activator.

[0047] S223. Add 3g of γ-aminopropyltriethoxysilane and 17ml of anhydrous ethanol to the activator in the second step, and continue the reaction at 55℃ for 25min to obtain the activation modifier;

[0048] The preparation of the modified alkali activator includes the following steps:

[0049] S21. Add 45g of nano-lithium silicate to 140g of sodium hydroxide with a mass fraction of 25% and disperse ultrasonically at a frequency of 40kHz for 20min.

[0050] S22. Add 10g of activating modifier, 3g of diethylenetriaminepentimidephosphonic acid, and 0.3g of sodium gluconate to the solution obtained in step S21 in sequence, and stir at 300r / min for 10min.

[0051] S23. The mixture obtained in step S22 is stirred at 500 r / min for 1.5 h in a water bath at 90 °C, and then cooled to 40 °C to obtain the modified alkali activator.

[0052] The preparation of modified tailings sand includes the following steps:

[0053] S11. Add 0.5g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane and 0.2-mercaptopropylmethyldimethoxysilane to 20ml of anhydrous ethanol, adjust the pH to 4 with acetic acid, and hydrolyze for 25min to obtain silane modifier.

[0054] S12. Mix 800g of tailings sand (containing 60% silica, 10% alumina, and 30% iron oxide) with 30g of tailings powder and dry at 100℃ for 1 hour to obtain tailings mixture.

[0055] S13. Spray the silane modifier obtained in step S11 into the tailings mixture and stir at a speed of 600 r / min for 10 min;

[0056] S14. Adding 0.1 g nano cerium oxide to the mixture obtained in step S13, continuing to stir for 15 min, hot air curing at 75℃ for 50 min, to obtain modified tailings sand;

[0057] S1. Mixing 551 g of slag (specific surface area 430 m 2 / kg, in which the content of silicon dioxide is 33%, the content of calcium oxide is 38%, and the content of aluminum oxide is 29%), 200 g of fly ash, 45 g of silicon powder (specific surface area 19600 m 2 / kg, in which the content of silicon dioxide is 94%, the content of iron oxide is 6%), stirring at a speed of 200 r / min for 15 min to obtain the required mixture;

[0058] S2. Mixing the mixture obtained in step S1 and the modified tailings sand in a ratio of 1:1, adding 78 g of steel fiber, 20 g of polyvinyl alcohol fiber, 22 g of borax, and 359 g of modified alkali activator, and uniformly mixing and stirring to obtain tailings concrete;

[0059] S3. Pouring the prepared concrete into a pole mold and placing it in a vibrating table for 3 min, and after the mold is filled, the test mold is cured at room temperature for 20 h and then demolded, the test block after demolding is placed in a curing box, and cured at a relative humidity of 85% and a room temperature of 15℃ for 7 days, to obtain a steel rod tailings super high performance concrete pole.

[0060] Example 2

[0061] Method for manufacturing a steel rod tailings super high performance concrete pole:

[0062] Before manufacturing the steel rod tailings super high performance concrete pole, the preparation of the activation modifier, the modified alkali activator, and the modified tailings sand is performed:

[0063] The preparation of the activation modifier includes the following steps:

[0064] S221. Adding 40 g of triethanolamine and 20 g of polyether amine to a reaction kettle, stirring at a speed of 350 r / min at 45℃ for 15 min to obtain a preliminary activator;

[0065] S222. Slowly adding 15 g of tetrabutyl titanate to the preliminary activator obtained in step S221 at a speed of 1 mL / min, after the addition is completed, heating to 80℃ and reacting for 60 min to obtain a secondary activator;

[0066] S223. Adding 5 g of γ-aminopropyltriethoxysilane and 20 ml of anhydrous ethanol to the secondary activator, and continuing to react at 60℃ for 30 min to obtain an activation modifier;

[0067] The preparation of the modified alkali activator comprises the following steps:

[0068] S21. 50 g of nano lithium silicate is added into 145 g of sodium hydroxide with a mass fraction of 30% and ultrasonic dispersion is carried out at a frequency of 40 kHz for 25 min;

[0069] S22. 15 g of the activation modifier, 5 g of diethylene triamine pentaethylene phosphonic acid and 0.5 g of sodium gluconate are sequentially added into the solution obtained in step S21, and stirring is carried out at a rotating speed of 350 r / min for 20 min;

[0070] S23. The mixed solution obtained in step S22 is stirred at a rotating speed of 500 r / min for 2 h under the condition of a water bath at 95 ℃, and then cooled to 45 ℃, so as to obtain the modified alkali activator;

[0071] The preparation of the modified tailings sand comprises the following steps:

[0072] S11. 1 g of γ-(2, 3-epoxypropoxy) propyl trimethoxysilane and 0.4 g of mercaptopropyl methyl dimethoxysilane are added into 22 ml of anhydrous ethanol, hydrolysis is carried out for 30 min by using acetic acid to adjust the pH to 5, so as to obtain a silane modifier;

[0073] S12. 900 g of tailings sand (with a content of 65% of silicon dioxide, 20% of aluminum oxide and 15% of iron oxide) and 45 g of tailings powder are mixed, and drying is carried out at 105 ℃ for 2 h, so as to obtain a tailings mixture;

[0074] S13. The silane modifier obtained in step S11 is sprayed into the tailings mixture, and stirring is carried out at a rotating speed of 700 r / min for 15 min;

[0075] S14. 0.3 g of nano cerium oxide is added into the mixture obtained in step S13, and stirring is continuously carried out for 20 min, and hot air curing is carried out at 80 ℃ for 60 min, so as to obtain the modified tailings sand;

[0076] S1. 641 g of slag (with a specific surface area of 450 m 2 / kg, wherein the content of silicon dioxide is 35%, the content of calcium oxide is 40% and the content of aluminum oxide is 25%), 214 g of fly ash and 50 g of silicon powder (with a specific surface area of 19640 m 2 / kg, wherein the content of silicon dioxide is 95% and the content of iron oxide is 5%) are mixed, and stirring is carried out at a rotating speed of 300 r / min for 20 min, so as to obtain a required mixture;

[0077] S2. The mixture obtained in step S1 and the modified tailings sand are mixed according to a ratio of 1:1, 156 g of steel fiber, 30 g of polyvinyl alcohol fiber, 25 g of borax and 425 g of the modified alkali activator are added, and after uniform mixing and stirring, tailings concrete is prepared;

[0078] S3. Pour the prepared concrete into the pole mold, and put it into the vibrating table for 5 min. After the mold is filled, demold the test block after 24 h of normal temperature curing. Put the demolded test block into the curing box, and cure it at a relative humidity of 90% and a room temperature of 25℃ for 8 days to obtain the steel bar tailings ultra-high performance concrete pole.

[0079] Example 3

[0080] Method for manufacturing the steel bar tailings ultra-high performance concrete pole:

[0081] Before manufacturing the steel bar tailings ultra-high performance concrete pole, the preparation of the activation modifier, the modified alkali activator, and the modified tailings sand is performed.

[0082] The preparation of the activation modifier includes the following steps:

[0083] S221. Add 36 g of triethanolamine and 16 g of polyether amine into a reaction kettle, and stir at a speed of 320 r / min at 41℃ for 11 min to obtain a preliminary activator;

[0084] S222. Slowly add 13 g of tetrabutyl titanate into the preliminary activator obtained in step S221 at a speed of 1 mL / min, and after the dropwise addition is completed, increase the temperature to 76℃ and react for 52 min to obtain a secondary activator;

[0085] S223. Add 4 g of γ-aminopropyl triethoxysilane and 18 ml of anhydrous ethanol into the secondary activator, and continue to react at 57℃ for 26 min to obtain the activation modifier;

[0086] The preparation of the modified alkali activator includes the following steps:

[0087] S21. Add 46 g of nano lithium silicate into 141 g of sodium hydroxide with a mass fraction of 26%, and ultrasonically disperse at a frequency of 40 kHz for 21 min;

[0088] S22. Add 11 g of the activation modifier, 4 g of diethylenetriamine pentamethylene phosphonic acid, and 0.4 g of sodium gluconate into the solution obtained in step S21 in sequence, and stir at a speed of 320 r / min for 11 min;

[0089] S23. Stir the mixed solution obtained in step S22 in a water bath at 91℃ at a speed of 500 r / min for 1.6 h, and then cool it to 41℃ to obtain the modified alkali activator;

[0090] The preparation of the modified tailings sand includes the following steps:

[0091] S11. 0.6 g of γ-(2,3-epoxypropoxy) propyl trimethoxysilane and 0.3 g of mercaptopropyl methyl dimethoxysilane were added into 21 ml of anhydrous ethanol, and hydrolysis was carried out for 26 min by adjusting the pH to 4.5 with acetic acid to obtain a silane modifier;

[0092] S12. 810 g of tailings sand (with a content of 62% of SiO2, 13% of Al2O3 and 25% of Fe2O3) and 35 g of tailings powder were mixed and dried at 101 ℃ for 1.5 h to obtain a tailings mixture;

[0093] S13. The silane modifier obtained in step S11 was sprayed into the tailings mixture, and stirring was carried out at a rotation speed of 620 r / min for 11 min;

[0094] S14. 0.2 g of nano cerium oxide was added into the mixture obtained in step S13, and stirring was continued for 16 min, and hot air curing was carried out at 76 ℃ for 52 min to obtain a modified tailings sand;

[0095] S1. 601 g of slag (with a specific surface area of 440 m 2 / kg, wherein the content of SiO2 is 34%, the content of CaO is 39%, and the content of Al2O3 is 27%), 205 g of fly ash, and 46 g of silicon powder (with a specific surface area of 19610 m 2 / kg, wherein the content of SiO2 is 94.5%, and the content of Fe2O3 is 5.5%) were mixed and stirred at a rotation speed of 220 r / min for 16 min to obtain a mixture;

[0096] S2. The mixture obtained in step S1 and the modified tailings sand were mixed in a ratio of 1:1, 90 g of steel fiber, 22 g of polyvinyl alcohol fiber, 23 g of borax, and 380 g of modified alkali activator were added, and after uniform mixing and stirring, tailings concrete was prepared;

[0097] S3. The prepared concrete was poured into a pole mold, and was vibrated for 4 min on a vibrating table. After the completion of molding, the test mold was cured at room temperature for 21 h, and then was demolded. The test block after demolding was placed in a curing box, and was cured at a relative humidity of 86% and a room temperature of 17 ℃ for 7 days to obtain a steel rod tailings super high performance concrete pole.

[0098] Example 4

[0099] Method for manufacturing a steel rod tailings super high performance concrete pole:

[0100] Before manufacturing the steel rod tailings super high performance concrete pole, the preparation of the activation modifier, the modified alkali activator, and the modified tailings sand was carried out:

[0101] The preparation of the activation modifier comprises the following steps:

[0102] S221.38 g of triethanolamine, 18 g of polyether amine were added into a reaction kettle, stirred at 44 °C and 340 r / min for 14 min to obtain a preliminary activator;

[0103] S222.14 g of tetrabutyl titanate was slowly added into the preliminary activator obtained in step S221 at a speed of 1 mL / min, and after the dropwise addition was completed, the temperature was increased to 79 °C and reacted for 58 min to obtain a secondary activator;

[0104] S223.4.5 g of γ-aminopropyl triethoxysilane and 19 ml of anhydrous ethanol were added into the secondary activator, and after continuing to react at 59 °C for 29 min, a modified activator was obtained;

[0105] The preparation of the modified alkali activator comprises the following steps:

[0106] S21.49 g of nano lithium silicate was added into 144 g of 28% sodium hydroxide by mass, and ultrasonic dispersion was carried out at a frequency of 40 kHz for 24 min;

[0107] S22.14 g of the modified activator, 4.5 g of diethylenetriamine pentamethylene phosphonic acid, and 0.45 g of sodium gluconate were sequentially added into the solution obtained in step S21, and stirred at a speed of 340 r / min for 18 min;

[0108] S23.The mixture obtained in step S22 was stirred at a speed of 500 r / min for 1.8 h in a water bath at 94 °C, and then cooled to 44 °C to obtain a modified alkali activator;

[0109] The preparation of the modified tailings sand comprises the following steps:

[0110] S11.0.8 g of γ-(2,3-epoxypropoxy) propyl trimethoxysilane and 0.35 g of mercaptopropyl methyl dimethoxysilane were added into 21 ml of anhydrous ethanol, the pH was adjusted to 4.5 with acetic acid, and hydrolysis was carried out for 28 min to obtain a silane modifier;

[0111] S12.880 g of tailings sand (silicon dioxide content of 64%, aluminum oxide content of 18%, and iron oxide content of 18%) and 42 g of tailings powder were mixed, and dried at 104 °C for 1.5 h to obtain a tailings mixture;

[0112] S13.The silane modifier obtained in step S11 was sprayed onto the tailings mixture, and stirred at a speed of 680 r / min for 14 min;

[0113] S14.0.25 g of nano cerium oxide was added into the mixture obtained in step S13, and continued to be stirred for 18 min, and then hot air solidification was carried out at 79 °C for 58 min to obtain a modified tailings sand;

[0114] S1. 630 g of slag (specific surface area of 440 m 2 / kg, wherein the content of silicon dioxide is 34%, the content of calcium oxide is 39%, and the content of aluminum oxide is 27%), 211 g of fly ash, and 48 g of silicon powder (specific surface area of 19630 m 2 / kg, wherein the content of silicon dioxide is 94.5%, and the content of iron oxide is 5.5%) were mixed, stirred at a speed of 280 r / min for 18 min, and a mixture was prepared.

[0115] S2. The mixture obtained in step S1 and modified tailings were mixed according to a ratio of 1:1, 142 g of steel fiber, 28 g of polyvinyl alcohol fiber, 24 g of borax, and 413 g of modified alkali activator were added, and after uniform mixing and stirring, tailings concrete was prepared.

[0116] S3. The prepared concrete was poured into a pole mold and placed in a vibrating table for 4.5 min. After the mold was filled, the test block was demolded after curing at room temperature for 23 h. The demolded test block was placed in a curing box and cured at a relative humidity of 89% and a room temperature of 24℃ for 8 days, and a steel bar tailings ultra-high performance concrete pole was obtained.

[0117] Comparative Example 1

[0118] Comparative Example 1 and Example 1 have the following differences. The only difference is that no modified alkali activator is added in Comparative Example 1, and the remaining steps are completely the same in Comparative Example 1 and Example 1.

[0119] Comparative Example 2

[0120] Comparative Example 2 and Example 1 have the following differences. The only difference is that the modified tailings are replaced by ordinary tailings in Comparative Example 2, and the remaining steps are completely the same in Comparative Example 2 and Example 1.

[0121] Comparative Example 3

[0122] Comparative Example 3 and Example 1 have the following differences. The only difference is that the content of modified tailings is controlled to be 20% in Comparative Example 3, and the remaining steps are completely the same in Comparative Example 3 and Example 1.

[0123] Comparative Example 4

[0124] Comparative Example 4 and Example 1 have the following differences. The only difference is that the content of modified tailings is controlled to be 60% in Comparative Example 4, and the remaining steps are completely the same in Comparative Example 4 and Example 1.

[0125] Performance test:

[0126] The performance of the steel bar tailings ultra-high performance concrete pole test pieces prepared from the above examples 1-4 and comparative examples 1-2 after curing is tested according to the standard GB / T 50081-2002 Standard for testing the mechanical properties of ordinary concrete, and the results are shown in Table 1 below.

[0127] Table 1

[0128]

[0129] Comparative example 1 and comparative example 2 do not add modified alkali activator and modified tailings sand, respectively, and it can be seen from Table 1 that the compressive strength of examples 1-4 is much greater than that of comparative examples 1-2, and the modified alkali activator and modified tailings sand in the present application play an important role in improving the compressive strength of the present application.

[0130] Figure 1 Figure 5 Figure 1 is a broken line graph showing the effect of the amount of modified tailings sand in examples 1 and comparative examples 2-4 on the compressive strength, wherein the amount of modified tailings sand in example 1 is 40%, the amount of modified tailings sand in comparative example 2 is 0%, the amount of modified tailings sand in comparative example 3 is 20%, and the amount of modified tailings sand in comparative example 4 is 60%. It can be seen from the figure that the compressive strength is the greatest when the amount of modified tailings sand is 40%, and the compressive strength of the unmodified tailings sand is the smallest, proving that the modified tailings sand of the present application can effectively improve the compressive strength of the steel bar tailings ultra-high performance concrete pole.

[0131] Although embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. Steel bar tailings ultra high performance concrete electric pole, characterized in that, The following components are included by mass fraction: 551-641 parts of slag, 200-214 parts of fly ash, 45-50 parts of silica powder, 800-900 parts of modified tailings sand, 78-156 parts of steel fiber, 22-25 parts of borax, and 359-425 parts of modified alkali activator, 20-30 parts of polyvinyl alcohol fiber; The preparation of the modified alkali activator includes the following steps: S21. 45-50 parts of nanometer lithium silicate are added to 140-145 parts of sodium hydroxide with a mass fraction of 25-30% for ultrasonic dispersion at a frequency of 40 kHz for 20-25 min; S22. 10-15 parts of an excitation modifier, 3-5 parts of diethylene triamine pentaformyl phosphonic acid, and 0.3-0.5 parts of sodium gluconate are sequentially added to the solution obtained in step S21, and stirred at a speed of 300-350 r / min for 10-20 min; S23. The mixed solution obtained in step S22 is stirred at a speed of 500 r / min for 1.5-2 h under water bath conditions at 90-95 °C, and then cooled to 40-45 °C to obtain the modified alkali activator; The preparation of the excitation modifier includes the following steps: S221. 35-40 parts of triethanolamine and 15-20 parts of polyether amine are added to a reaction kettle, stirred at a speed of 300-350 r / min for 10-15 min at 40-45 °C to obtain a preliminary excitation agent; S222. 12-15 parts of tetrabutyl titanate are slowly added to the preliminary excitation agent obtained in step S221 at a speed of 1 mL / min, the temperature is raised to 75-80 °C after the addition is completed, and the reaction is carried out for 50-60 min to obtain a secondary excitation agent; S223. 3-5 parts of γ-aminopropyl triethoxysilane and 17-20 parts of anhydrous ethanol are added to the secondary excitation agent, and the reaction is continued at 55-60 °C for 25-30 min to obtain the excitation modifier; The preparation of the modified tailings sand includes the following steps: S11. 0.5-1 parts of γ-(2,3-epoxypropoxy) propyl trimethoxysilane and 0.2-0.4 parts of mercaptopropyl methyl dimethoxysilane are added to 20-22 parts of anhydrous ethanol, the pH is adjusted to 4-5 using acetic acid, and hydrolysis is carried out for 25-30 min to obtain a silane modifier; S12. 800-900 parts of tailings sand and 30-45 parts of tailings powder are mixed, and the mixture is dried at 100-105 °C for 1-2 h to obtain a tailings mixture; S13. The silane modifier obtained in step S11 is sprayed onto the tailings mixture, and stirred at a speed of 600-700 r / min for 10-15 min; S14. 0.1-0.3 parts of nanometer cerium oxide are added to the mixture obtained in step S13, and the stirring is continued for 15-20 min, and hot air curing is carried out at 75-80 °C for 50-60 min to obtain the modified tailings sand.

2. Steel-rod tailings ultra high performance concrete electric pole according to claim 1, characterized in that, The specific surface area of the slag is 430-450 m 2 / kg, wherein the silica content is 33-35%, the calcium oxide content is 38-40%, and the remaining component is aluminum oxide.

3. Steel slag tailing ultra high performance concrete electric pole according to claim 1, characterized in that, The specific surface area of the silicon powder is 19600-19640 m 2 / kg, wherein the silica content is 94-95%, the remaining components being iron oxides.

4. Steel-rod tailings ultra high performance concrete electric pole according to claim 1, characterized in that, The steel fiber is flat and straight, with a length of 11-15 mm, an equivalent diameter of 1-1.2 mm, and a tensile strength of ≥600 MPa.

5. Steel-rod tailings ultra high performance concrete electric pole according to claim 1, characterized in that, The tailings powder is a clinker obtained by calcining tailings sand, with a mesh size of 200 mesh.

6. Steel-rod tailings ultra high performance concrete electric pole according to claim 1, characterized in that, The tailings sand is tailings waste collected from a tailings field and is continuously graded with a continuous particle size of 80-325 mesh, and the silica content in the tailings sand is 60-65%, the alumina content is 10-20%, and the remaining components are iron oxides.

7. A method for manufacturing a steel bar tailings ultra high performance concrete pole according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: S1. mixing 551-641 parts of slag, 200-214 parts of fly ash, and 45-50 parts of silica powder by mass fraction, stirring at a speed of 200-300 r / min for 15-20 min to obtain the required mixture; S2. mixing the mixture obtained in step S1 and the modified tailings sand at a ratio of 1:1, adding 78-156 parts of steel fiber, 20-30 parts of polyvinyl alcohol fiber, 22-25 parts of borax, and 359-425 parts of modified alkali activator, and uniformly mixing and stirring to obtain tailings concrete; S3. pouring the prepared concrete into a pole mold and placing it in a vibrating table for 3-5 min, demolding after 20-24 h of curing at room temperature after molding, placing the demolded test block in a curing box, and curing at a relative humidity of 85-90% and a room temperature of 15-25°C for 7-8 days to obtain a steel rod tailings super high performance concrete pole.

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