CN115745528A - High-performance concrete for thin-wall hollow pier of bridge in plateau area and preparation method thereof - Google Patents
High-performance concrete for thin-wall hollow pier of bridge in plateau area and preparation method thereof Download PDFInfo
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Abstract
The high-performance concrete for the thin-wall hollow pier of the bridge in the plateau area comprises the following raw materials in parts by mass: 396-432 parts of sulphoaluminate cement, 16-20 parts of boron carbide powder, 358-509 parts of natural sand, 218-358 parts of boron carbide micro-beads, 1036-1072 parts of broken stone, 8-12 parts of modified polypropylene fiber, and nano SiO 2 4 to 6 portions of stainless steel acid-washing sludge, 16 to 20 portions of stainless steel acid-washing sludge, 20 to 24 portions of n-nonadecane, 158 to 185 portions of water and 4.6 to 5.6 portions of water reducing agent. And provides a preparation method of the high-performance concrete for the thin-wall hollow pier of the bridge in the plateau area. The invention can effectively prepare the nano-grade silicon dioxide by adding the boron carbide material, the stainless steel acid-washing sludge, the n-nonadecane, the nano-SiO 2 and the modified polypropylene fiberThis part of the performance of reinforced concrete and performs well in plateau environments.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to high-performance concrete for a thin-wall hollow pier of a bridge in a plateau area and a preparation method of the high-performance concrete.
Background
The bridge thin-wall hollow pier is a main pier body form of a bridge spanning complex terrain, the pier is of a hollow structure, the wall thickness of the pier body is usually 0.5-0.6 m, and the pier body is often found in modern bridge structures due to high strength/mass ratio and rigidity/mass ratio. The service life of a common bridge is long, the durability of concrete is a key index for ensuring the service life of the bridge, and the thickness of the bridge thin-wall hollow pier body is small, so that the pier body has a cracking risk in the early stage under the action of temperature stress or concrete shrinkage, and the mechanical property and the durability of the bridge thin-wall hollow pier can be influenced.
With the progress of construction technology, china has accumulated quite abundant extreme environment construction experience, and particularly has continuous new technical breakthroughs in plateau environment. The environment of plateau area is severe, because the air is thin and clean, the annual sunshine duration of most areas reaches more than 2600 hours, and the annual solar radiation total amount is 5000mJ/m 2 This, above, makes annual evaporations greater in plateau areas. The using amount of concrete is huge in the construction process of the bridge thin-wall hollow pier, the concrete is used as a hydraulic material, and the shrinkage caused by internal water loss is one of the main reasons for generating cracks. In addition, the annual average temperature in areas such as Qinghai-Tibet plateau is-6-8 ℃, the annual temperature difference is 16-28 ℃, and the frequency of large-amplitude alternation of day and night temperature is obviously higher than that in plain areas at the same latitude. The large temperature difference environment is unfavorable for the development of concrete performance, such as cracks caused by temperature stress, frost heaving stress generated by free water in the concrete, slow hydration process under low temperature condition, influence on the development of mechanical property and the like. Therefore, the bridge thin-wall hollow pier concrete available in the plateau area needs to have reliable shrinkage resistance, freeze-thaw resistance and early strength development capability.
In order to solve the problems, the traditional method adopts an additive to regulate and control the performance of the concrete, the freeze-thaw resistance and the early strength development capability of the concrete can be improved by adding a chloride additive, but the risk of corrosion of steel bars in the bridge thin-wall hollow pier can be greatly increased by adding the chloride. In addition, in the related patents, paraffin is used as a phase change material to improve the freeze-thaw resistance of concrete, but paraffin is easy to leak after phase change, so that the heat storage capacity of concrete is reduced, and therefore, a packaging measure is required to be adopted, and the process flow is complicated. The crack resistance of concrete can be improved by adding the fibers, but because the surface of the fibers and the cement basically have no reactivity, an obvious interface transition area exists between the fibers and the concrete matrix.
In 2018, the yield of the stainless steel in China exceeds 2600 million tons, and the yield of the stainless steel acid pickling sludge is a byproduct of stainless steel production, and is usually about 3 percent of the yield of the stainless steel. The stainless steel pickling sludge is difficult to treat due to the large content of heavy metals, but contains considerable CaSO 4 The components can be applied to cement-based materials, and the setting and hardening of cement can effectively seal heavy metals. The boron carbide material has high elastic modulus and high wear resistance, is often used as a grinding medium, has stable property and is inert in concrete, and the boron carbide materials with different scales can play a role in inert filling or optimizing gradation. The n-nonadecane is used as a phase change material, is often applied to the field of chemical industry, and can be well reserved in concrete capillary pores under the action of surface tension compared with paraffin wax, and has a good phase change energy storage effect. Nano SiO2 2 Is considered to be used as a nucleating agent to accelerate the hydration rate of cement by coating the surface of polypropylene fiber with nano SiO 2 Also, the adhesive strength between the fibers and the concrete matrix can be improved, thereby further suppressing the occurrence of cracks.
Severe environmental conditions such as low-temperature drying in plateau areas, strong solar radiation, large day and night temperature difference and the like mean that the bridge thin-wall hollow pier cracks more frequently and seriously. Therefore, the concrete, which is a main component material of the pier body, needs to overcome the influence of the severe environment in the highland and has excellent shrinkage resistance, freeze-thaw resistance, early strength development ability and the like on the premise of satisfying basic performances such as strength and the like.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the high-performance concrete for the thin-wall hollow pier of the bridge in the plateau area and the preparation method thereof. Compared with the traditional sulphoaluminate cement concrete and portland cement concrete, the concrete prepared by the method has better early strength and crack resistance, the freeze-thaw resistance of the concrete is obviously improved, the plateau environment can be better adapted, and the service life of the thin-wall hollow pier structure of the bridge is prolonged.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the high-performance concrete for the thin-wall hollow pier of the bridge in the plateau area comprises the following raw materials in parts by mass: 396-432 parts of sulphoaluminate cement, 16-20 parts of boron carbide powder, 358-509 parts of natural sand, 218-358 parts of boron carbide micro-beads, 1036-1072 parts of broken stone, 8-12 parts of modified polypropylene fiber and nano SiO 2 4 to 6 portions of stainless steel acid-washing sludge, 16 to 20 portions of stainless steel acid-washing sludge, 20 to 24 portions of n-nonadecane, 158 to 185 portions of water and 4.6 to 5.6 portions of water reducing agent.
Further, the sulphoaluminate cement is 42.5-grade sulphoaluminate cement, and the specific surface area of the sulphoaluminate cement is more than or equal to 350m 2 (iv) kg; the natural sand is II-zone graded natural river sand, and the fineness modulus of the natural sand is 2.4-3.0; the gravels are continuous graded gravels limestone with the particle size of 5-20 mm; the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent, and the water reducing efficiency is 25%.
Furthermore, the specific surface area of the boron carbide powder is more than or equal to 600m 2 The fineness modulus of the boron carbide microbeads is 2.3-3.0, and the elastic modulus is more than or equal to 300GPa; the specific surface area of the stainless steel acid-washing sludge powder is more than or equal to 450m 2 Kg, its main component is CaSO 4 50～60wt％，Fe 2 O 3 15～26wt％，CaO5～14wt％，SiO 2 2～4wt％(ii) a The purity of the n-nonadecane is more than 99 percent.
Preferably, the nano SiO 2 The raw materials for preparation are tetraethoxysilane, concentrated ammonia water and absolute ethyl alcohol.
Preferably, the tensile strength of the modified polypropylene fiber is more than or equal to 350MPa.
A preparation method of high-performance concrete for a thin-wall hollow pier of a bridge in a plateau area comprises the following steps:
(1) Preparing the following raw materials in parts by mass: 396-432 parts of sulphoaluminate cement, 16-20 parts of boron carbide powder, 358-509 parts of natural sand, 218-358 parts of boron carbide micro-beads, 1036-1072 parts of broken stone, 8-12 parts of modified polypropylene fiber and nano SiO 2 4 to 6 parts of stainless steel acid-washing sludge, 16 to 20 parts of nonadecane, 20 to 24 parts of n-nonadecane, 158 to 185 parts of water and 4.6 to 5.6 parts of water reducing agent;
(2) Mixing nano SiO 2 Adding a water reducing agent and water into water, and stirring the mixture in an ultrasonic stirrer to form uniformly dispersed mixed solution;
(3) Mixing sulphoaluminate cement, boron carbide powder, natural sand, macadam, boron carbide micro-beads, stainless steel acid-washing sludge powder and n-nonadecane in a mixer at a low speed for 200-300 s, then adding 60-80% of mixed solution, then mixing at a low speed for 150-200 s, then adding the rest mixed solution and modified polypropylene fiber, and mixing at a high speed for 180-240 s to obtain the fresh concrete.
Further, in the step (1), the preparation method of the stainless steel pickling sludge powder comprises the following steps: drying the stainless steel pickling sludge at 105 ℃ for 24 hours, then placing the dried stainless steel pickling sludge in a ball mill for grinding for 2 hours, and then sieving the ground stainless steel pickling sludge through a 200-mesh sieve to obtain the stainless steel pickling sludge powder.
Further, in the step (1), the nano SiO 2 The preparation process comprises the following steps: mixing concentrated ammonia water and absolute ethyl alcohol, adjusting the pH value of the mixed solution to be within the range of 10-12, then adding 8-10% by volume of tetraethoxysilane, heating the solution to 60-70 ℃, slowly stirring the solution at constant temperature, and reacting for 6-8 hours; then filtering to obtain a reaction product, washing with deionized water, vacuum-drying the reaction product for 10-14 h, then placing the reaction product in a crucible, heating to 600 E.CCooling at 650 deg.C to obtain nanometer SiO 2 And (3) granules.
Still further, the preparation process of the modified polypropylene fiber comprises the following steps: adding 10-20% of nano SiO in the absolute ethyl alcohol 2 And (2) carrying out ultrasonic stirring on the particles for 30-45 min to obtain a uniform mixture, then immersing the undisturbed polypropylene fiber into the solution, taking out the fiber after 1-2 h, pressing residual liquid in the fiber by using a roller press, and finally carrying out vacuum drying at 50-70 ℃ to constant weight to obtain the modified polypropylene fiber.
The technical conception of the invention is as follows: according to the invention, the boron carbide powder is used for replacing cement, and the boron carbide microspheres are used for replacing fine aggregates, so that the early strength of the concrete is effectively improved. By reasonably using the stainless steel acid-washing sludge powder and the n-nonadecane, the freeze-thaw resistance of the concrete is effectively improved. The surface of the modified polypropylene fiber is pretreated and covered with nano SiO 2 The transition area of the interface between the fiber and the concrete matrix can be improved. The nano SiO 2 And the water-soluble polymer is also used as a nucleating agent for accelerating early hydration reaction. The invention is helpful to solve the problems of slow strength development, durability reduction and the like which are easily caused in the severe environment of plateau areas.
The invention has the following beneficial effects:
1. the stainless steel pickling sludge as a solid waste contains a plurality of heavy metal components harmful to the environment, but contains a large amount of CaSO 4 The processed concrete can be used for reducing the freezing point of free water in the concrete and relieving the frost heaving stress generated in the concrete in a low-temperature environment. And heavy metal components in the stainless steel acid-washing sludge can be effectively fixed in concrete, so that the influence of the heavy metal components on the environment is reduced.
2. The invention prepares the nano SiO by hydrolyzing tetraethoxysilane in an alkaline environment 2 And the nucleating agent is used as a nucleating agent, can play a role of crystal nucleus in concrete and is beneficial to accelerating C 3 S and the like of the clinker phase. In addition, by mixing nano SiO 2 Covering the surface of the polypropylene fiber, and being beneficial to the generation of hydrated gel on the surface of the fiber, thereby strengthening the interface transition area between the fiber and the concrete matrix, and improving the performanceMechanical property and crack resistance of concrete.
3. According to the invention, the boron carbide powder is used for replacing cement, and the boron carbide microspheres are used for replacing fine aggregates, so that the effect of inert filler or optimized gradation can be achieved, and the mechanical property of the concrete is improved.
4. In the invention, n-nonadecane is added in the concrete mixing process as a phase change material, and can be remained in concrete pores. Because the temperature difference in plateau areas is large, the n-nonadecane can absorb heat in sunshine time and convert into liquid, the liquid is gathered in concrete pores, and when the temperature at night is lowered, the n-nonadecane is solidified and releases heat, so that the concrete cracks caused by temperature stress can be reduced.
Detailed Description
The invention is further described below.
The high-performance concrete for the thin-wall hollow pier of the bridge in the plateau area comprises the following raw materials in parts by mass: 396-432 parts of sulphoaluminate cement, 16-20 parts of boron carbide powder, 358-509 parts of natural sand, 218-358 parts of boron carbide micro-beads, 1036-1072 parts of broken stone, 8-12 parts of modified polypropylene fiber, and nano SiO 2 4 to 6 portions of stainless steel acid-washing sludge, 16 to 20 portions of stainless steel acid-washing sludge, 20 to 24 portions of n-nonadecane, 158 to 185 portions of water and 4.6 to 5.6 portions of water reducing agent.
The formulation of this example is:
432 parts of sulphoaluminate cement, 20 parts of boron carbide powder, 358 parts of natural sand, 358 parts of boron carbide micro-beads, 1036 parts of broken stone, 12 parts of modified polypropylene fiber and nano SiO 2 6 parts of stainless steel pickling sludge 20 parts, 24 parts of nonadecane, 158 parts of water, 5.6 parts of water reducing agent and 0.35 of water-to-glue ratio.
Or the following steps: 414 parts of sulphoaluminate cement, 18 parts of boron carbide powder, 434 parts of natural sand, 288 parts of boron carbide microspheres, 1055 parts of broken stone, 10 parts of modified polypropylene fiber and nano SiO 2 5 parts of stainless steel pickling sludge, 18 parts of nonadecane, 22 parts of water, 173 parts of water reducing agent and 0.4 of water-to-glue ratio.
Or the following steps: 396 parts of sulphoaluminate cement, 16 parts of boron carbide powder, 509 parts of natural sand, 218 parts of boron carbide micro-beads, 1072 parts of broken stone and modification8 parts of polypropylene fiber and nano SiO 2 4 parts of stainless steel pickling sludge 16 parts, 20 parts of nonadecane, 185 parts of water, 4.6 parts of a water reducing agent, and the water-to-glue ratio is 0.45.
Furthermore, the sulphoaluminate cement is 42.5-grade sulphoaluminate cement, and the specific surface area of the sulphoaluminate cement is more than or equal to 350m 2 Per kg; the natural sand is II-zone graded natural river sand, and the fineness modulus of the natural sand is 2.4-3.0; the gravels are continuous graded gravels limestone with the particle size of 5-20 mm; the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent, and the water reducing efficiency is 25%.
Furthermore, the specific surface area of the boron carbide powder is more than or equal to 600m 2 The fineness modulus of the boron carbide micro-beads is 2.3-3.0, and the elastic modulus is more than or equal to 300GPa; the specific surface area of the stainless steel acid-washing sludge powder is more than or equal to 450m 2 Kg, its main component is CaSO 4 50～60wt％，Fe 2 O 3 15～26wt％，CaO5～14wt％，SiO 2 2 to 4 weight percent; the purity of the n-nonadecane is more than 99 percent.
Preferably, the nano SiO 2 The preparation raw materials of the compound are tetraethoxysilane, concentrated ammonia water and absolute ethyl alcohol.
Preferably, the tensile strength of the modified polypropylene fiber is more than or equal to 350MPa.
A preparation method of high-performance concrete for a thin-wall hollow pier of a bridge in a plateau area comprises the following steps:
(1) Preparing the following raw materials in parts by mass: 396-432 parts of sulphoaluminate cement, 16-20 parts of boron carbide powder, 358-509 parts of natural sand, 218-358 parts of boron carbide micro-beads, 1036-1072 parts of broken stone, 8-12 parts of modified polypropylene fiber, and nano SiO 2 4 to 6 portions of stainless steel acid-washing sludge, 16 to 20 portions of nonadecane, 20 to 24 portions of n-nonadecane, 158 to 185 portions of water and 4.6 to 5.6 portions of water reducing agent;
(2) Mixing nano SiO 2 Adding a water reducing agent and water into water, and stirring the mixture in an ultrasonic stirrer to form uniformly dispersed mixed solution;
(3) Mixing sulphoaluminate cement, boron carbide powder, natural sand, macadam, boron carbide micro-beads, stainless steel acid-washing sludge powder and n-nonadecane in a mixer at a low speed for 200-300 s, then adding 60-80% of mixed solution, then mixing at a low speed for 150-200 s, then adding the rest mixed solution and modified polypropylene fiber, and mixing at a high speed for 180-240 s to obtain the fresh concrete.
Further, in the step (1), the preparation method of the stainless steel pickling sludge powder comprises the following steps: drying the stainless steel pickling sludge at 105 ℃ for 24h, then placing the stainless steel pickling sludge in a ball mill for grinding for 2h, and then sieving the stainless steel pickling sludge through a 200-mesh sieve to obtain the stainless steel pickling sludge powder.
Further, in the step (1), the nano SiO 2 The preparation process comprises the following steps: mixing concentrated ammonia water and absolute ethyl alcohol, adjusting the pH value of the mixed solution to be within the range of 10-12, then adding 8-10% by volume of tetraethoxysilane, heating the solution to 60-70 ℃, slowly stirring the solution at constant temperature, and reacting for 6-8 hours; then filtering to obtain a reaction product, washing with deionized water, drying the reaction product in vacuum for 10-14 h, then placing the reaction product in a crucible, heating to 600-650 ℃, and cooling to obtain nano SiO 2 And (3) granules.
Still further, the preparation process of the modified polypropylene fiber comprises the following steps: adding 10-20% of nano SiO in absolute ethyl alcohol 2 And (2) carrying out ultrasonic stirring on the particles for 30-45 min to obtain a uniform mixture, then immersing the undisturbed polypropylene fiber into the solution, taking out the fiber after 1-2 h, pressing residual liquid in the fiber by using a roller press, and finally carrying out vacuum drying at 50-70 ℃ to constant weight to obtain the modified polypropylene fiber.
Based on the above formulation, the amounts of the different components were adjusted to give examples 1-3,
example 1
432 parts of sulphoaluminate cement, 20 parts of boron carbide powder, 358 parts of natural sand, 358 parts of boron carbide micro-beads, 1036 parts of broken stone, 12 parts of modified polypropylene fiber and nano SiO 2 6 parts of stainless steel pickling sludge, 20 parts of nonadecane 24 parts, 158 parts of water, 5.6 parts of a water reducing agent, and the water-to-glue ratio is 0.35.
Example 2
414 parts of sulphoaluminate cement, 18 parts of boron carbide powder, 434 parts of natural sand, 288 parts of boron carbide micro-beads, 1055 parts of macadam, 10 parts of modified polypropylene fiber and nano SiO 2 5 parts of stainless steel18 parts of steel pickling sludge, 22 parts of n-nonadecane, 173 parts of water, 5.1 parts of a water reducing agent and 0.4 of water-to-gel ratio.
Example 3
396 parts of sulphoaluminate cement, 16 parts of boron carbide powder, 509 parts of natural sand, 218 parts of boron carbide microspheres, 1072 parts of broken stone, 8 parts of modified polypropylene fiber and nano SiO 2 4 parts of stainless steel pickling sludge 16 parts, 20 parts of nonadecane, 185 parts of water, 4.6 parts of a water reducing agent, and the water-to-glue ratio is 0.45.
Two sets of comparative experiments are set, and a comparative example 1 and a comparative example 2 are used for comparing the differences of the concrete of the invention and the traditional sulphoaluminate cement concrete and portland cement concrete in the aspects of freeze-thaw resistance, mechanical property and crack resistance, and the specific mixing ratio is as follows:
comparative example 1
432 parts of 42.5-grade sulphoaluminate cement, 722 parts of natural sand, 1055 parts of broken stone, 173 parts of water, 5.1 parts of water reducing agent and 0.4 of water-cement ratio.
Comparative example 2
432 parts of 42.5-grade portland cement, 722 parts of natural sand, 1055 parts of crushed stone, 173 parts of water, 5.1 parts of a water reducing agent and 0.4 of water-cement ratio.
The concrete freeze-thaw experimental method is carried out according to GB/T50082-2009 Standard test method for long-term performance and durability of common concrete. The compressive strength test method is carried out according to GBT 50081-2019 standard of concrete physical and mechanical property test method. In order to research the crack resistance of concrete, refer to a method recommended by T/CECS 10001-2019 crack-resistant and anti-permeability composite material used in concrete. The results of the experiments are shown in tables 1, 2 and 3.
Table 1 shows the results of the concrete freeze-thaw resistance tests.
TABLE 1
Table 2 shows the results of the concrete compressive strength test (MPa).
| Age of age | Comparative example 1 | Comparative example 2 | Example 1 | Example 2 | Example 3 |
| 1d | 31.3 | 17.8 | 45.2 | 41.6 | 37.7 |
| 3d | 42.6 | 28.7 | 54.1 | 48.8 | 44.4 |
| 7d | 44.9 | 36.8 | 58.5 | 52.1 | 47.2 |
| 28d | 47.1 | 44.6 | 62.6 | 56.8 | 50.6 |
TABLE 2
Table 3 shows the concrete crack resistance test results.
TABLE 3
As shown in table 1, comparative example 2 had a mass loss rate of over 5% after 163 freeze-thaw cycles, indicating that the maximum number of freeze-thaw cycles had been reached. It can be seen by combining comparative example 1 and comparative example 2 that the concrete prepared using the sulphoaluminate cement possesses better freeze-thaw resistance than the portland cement. The concrete prepared by the method has further improved freeze-thaw resistance by combining the comparative example 1 and the examples 1 to 3.
As shown in table 2, it can be concluded that the concrete prepared using the sulphoaluminate cement has better early strength compared to the portland cement by combining comparative example 1 and comparative example 2. Combining comparative example 1 and examples 1-3, it can be seen that the early strength of the sulphoaluminate cement concrete prepared by the method develops more rapidly.
As shown in Table 3, it can be understood by combining comparative example 1 and comparative example 2 that the concrete prepared by using the sulfoaluminate cement is effective in reducing crack generation and the sulfoaluminate cement concrete has less drying shrinkage deformation, compared to the portland cement. By combining comparative example 1 and examples 1 to 3, it can be seen that the drying shrinkage of the sulphoaluminate cement concrete prepared by the method is obviously reduced, and the cracks of the concrete are further reduced.
The above results show that boron carbide powder, boron carbide microbeads, modified polypropylene fibers and nano SiO 2 Stainless steel pickling sludge, with addition of n-nonadecane to sulfurThe freeze-thaw resistance, the early strength, the shrinkage resistance and the crack resistance of the aluminate cement concrete are obviously improved, and the result obtained in the embodiment is still superior to that obtained in the comparative example along with the improvement of the water-cement ratio, thereby fully illustrating the reliability of the invention.
The embodiments described in this specification are merely exemplary of implementations of the inventive concepts and are provided for illustrative purposes only. The scope of the present invention should not be construed as being limited to the particular forms set forth in the embodiments, but is to be accorded the widest scope consistent with the principles and equivalents thereof as contemplated by those skilled in the art.
Claims (9)
1. The high-performance concrete for the thin-wall hollow pier of the bridge in the plateau area is characterized by comprising the following raw materials in parts by mass: 396-432 parts of sulphoaluminate cement, 16-20 parts of boron carbide powder, 358-509 parts of natural sand, 218-358 parts of boron carbide micro-beads, 1036-1072 parts of broken stone, 8-12 parts of modified polypropylene fiber, and nano SiO 2 4 to 6 portions of stainless steel acid-washing sludge, 16 to 20 portions of stainless steel acid-washing sludge, 20 to 24 portions of nonadecane, 158 to 185 portions of water and 4.6 to 5.6 portions of water reducing agent.
2. The high-performance concrete for the thin-walled hollow pier of the bridge in the plateau area as claimed in claim 1, wherein the sulphoaluminate cement is 42.5-grade sulphoaluminate cement, and the specific surface area is more than or equal to 350m 2 Per kg; the natural sand is II-zone graded natural river sand, and the fineness modulus of the natural sand is 2.4-3.0; the gravels are continuous graded gravels limestone with the particle size of 5-20 mm; the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent, and the water reducing efficiency is 25%.
3. The high-performance concrete for the thin-walled hollow pier of the bridge in the plateau area as claimed in claim 1 or 2, wherein the specific surface area of the boron carbide powder is more than or equal to 600m 2 The fineness modulus of the boron carbide micro-beads is 2.3-3.0, and the elastic modulus is more than or equal to 300GPa; the specific surface area of the stainless steel acid-washing sludge powder is more than or equal to 450m 2 /kg, its main component is CaSO 4 50～60wt％，Fe 2 O 3 15～26wt％，CaO5～14wt％，SiO 2 2 to 4 weight percent; the purity of the n-nonadecane is more than 99 percent.
4. The high-performance concrete for the thin-wall hollow pier of the bridge in the plateau area as claimed in claim 1 or 2, wherein the nano SiO is 2 The preparation raw materials of the compound are tetraethoxysilane, concentrated ammonia water and absolute ethyl alcohol.
5. The high-performance concrete for the thin-walled hollow pier of the bridge in the plateau area as claimed in claim 1 or 2, wherein the tensile strength of the modified polypropylene fiber is equal to or more than 350MPa.
6. The preparation method of the high-performance concrete for the thin-walled hollow pier of the bridge in the plateau area according to the claim 1, which is characterized by comprising the following steps:
(1) Preparing the following raw materials in parts by mass: 396-432 parts of sulphoaluminate cement, 16-20 parts of boron carbide powder, 358-509 parts of natural sand, 218-358 parts of boron carbide micro-beads, 1036-1072 parts of broken stone, 8-12 parts of modified polypropylene fiber, and nano SiO 2 4 to 6 portions of stainless steel acid-washing sludge, 16 to 20 portions of nonadecane, 20 to 24 portions of n-nonadecane, 158 to 185 portions of water and 4.6 to 5.6 portions of water reducing agent;
(2) Mixing nano SiO 2 Adding a water reducing agent and water into water, and stirring the mixture in an ultrasonic stirrer to form uniformly dispersed mixed solution;
(3) Mixing sulphoaluminate cement, boron carbide powder, natural sand, macadam, boron carbide micro-beads, stainless steel acid-washing sludge powder and n-nonadecane in a mixer at a low speed for 200-300 s, then adding 60-80% of mixed solution, then mixing at a low speed for 150-200 s, then adding the rest mixed solution and modified polypropylene fiber, and mixing at a high speed for 180-240 s to obtain the fresh concrete.
7. The method according to claim 6, wherein in the step (1), the method for preparing the stainless steel pickling sludge powder comprises: drying the stainless steel pickling sludge at 105 ℃ for 24h, then placing the stainless steel pickling sludge in a ball mill for grinding for 2h, and then sieving the stainless steel pickling sludge through a 200-mesh sieve to obtain the stainless steel pickling sludge powder.
8. The method according to claim 6 or 7, wherein in the step (1), the nano SiO is 2 The preparation process comprises the following steps: mixing concentrated ammonia water and absolute ethyl alcohol, adjusting the pH value of the mixed solution to be within the range of 10-12, then adding 8-10% by volume of tetraethoxysilane, heating the solution to 60-70 ℃, slowly stirring the solution at constant temperature, and reacting for 6-8 hours; then filtering to obtain a reaction product, washing with deionized water, drying the reaction product in vacuum for 10-14 h, then placing the reaction product in a crucible, heating to 600-650 ℃, and cooling to obtain the nano SiO 2 And (3) particles.
9. The method of claim 6 or 7, wherein the modified polypropylene fiber is prepared by: adding 10-20% of nano SiO in absolute ethyl alcohol 2 And (2) carrying out ultrasonic stirring on the particles for 30-45 min to obtain a uniform mixture, then immersing the undisturbed polypropylene fiber into the solution, taking out the fiber after 1-2 h, pressing residual liquid in the fiber by using a roller press, and finally carrying out vacuum drying at 50-70 ℃ to constant weight to obtain the modified polypropylene fiber.
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| CN116477897A (en) * | 2023-03-25 | 2023-07-25 | 苏州南方混凝土有限公司 | Cracking-resistant recycled concrete and preparation method thereof |
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