CN112645662A - Carbon oxide nanotube modified cement-based material and preparation method thereof - Google Patents
Carbon oxide nanotube modified cement-based material and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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Abstract
The invention provides a carbon oxide nanotube modified cement-based material and a preparation method thereof, wherein the cement-based material comprises the following components: cement, water, sand, fly ash, carbon oxide nanotubes, a polycarboxylic acid water reducing agent, polyvinyl alcohol, sodium lignosulfonate and ethylene glycol. The cement-based material comprises sodium lignosulfonate, polyvinyl alcohol, oxidized carbon nanotubes, ethylene glycol and the like, wherein the sodium lignosulfonate and the polyvinyl alcohol have good dispersing capacity and a large number of active groups, and can adsorb the carbon nanotubes in an aqueous solution and serve as a dispersing medium; the sodium lignosulfonate, the polyvinyl alcohol and the carbon oxide nano tube can form a more stable dispersion system, promote the hydration reaction of cement to form a tiny and regular crystal structure, reduce the micropore volume and increase the compactness of the cement-based material.
Description
Technical Field
The invention relates to the field of building materials, in particular to a carbon oxide nanotube modified cement-based material and a preparation method thereof.
Background
In modern building engineering, the advantages of low price, convenient use, easy construction and the like of cement-based materials become the most popular raw materials in the building fields such as roads, bridges, houses and the like. With the development of high performance of concrete, the development of cement concrete buildings is also moving from traditional materials with only bearing function to the direction of high strength, especially early strength, high durability, greening, sustainable use and intellectualization, and the research on high performance concrete has attracted extensive attention in various aspects. However, the high brittleness and easy cracking of common concrete often cause a large number of cracks in engineering, and the safety and durability of buildings are seriously affected. Particularly, in some severe environments, the construction difficulty and the construction period are often increased, the construction cost is greatly increased, and the quality of the building cannot be ensured. In addition, the continuous damage and repair of buildings can also cause huge pressure on resources, energy and environment, which is contrary to the national advocated green concrete construction policy.
Currently, the traditional method for improving the microstructure of concrete is to mix active mineral admixtures such as fly ash and mineral powder, which are attributed to the micro-aggregate characteristics and the activity effect of the fly ash and the mineral powder. In particular, fly ash has reduced CO2The potential for emissions and improved durability of concrete is of great concern and its ability to generate less heat during hydration can be used to inhibit cracking of large volumes of concrete due to heat. However, the filling effect of the admixture of active minerals such as fly ash and mineral powder is limited, the secondary hydration is lagged compared with the cement hydration and the efficiency is lower, the improvement of the mechanical property of concrete and the long-term maintenance of stable structure are difficult to realize, and particularly, the early mechanical property of the cement-based material can be greatly reduced by the incorporation of the fly ash.
Based on the technical defects existing in the prior art that the performance of concrete is improved by adding active mineral admixtures such as fly ash and mineral powder, the improvement is needed.
Disclosure of Invention
In view of the above, the invention provides a cement-based material modified by carbon oxide nanotubes and a preparation method thereof.
In a first aspect, the invention provides an oxidized carbon nanotube modified cement-based material, which comprises the following raw materials in parts by weight: 160-280 parts of cement, 80-140 parts of water, 480-760 parts of sand, 40-70 parts of fly ash, 9-25 parts of carbon oxide nanotubes, 1-2 parts of polycarboxylic acid water reducing agent, 6-8 parts of polyvinyl alcohol, 5-10 parts of sodium lignosulfonate and 0.5-1 part of ethylene glycol.
Optionally, the cement-based material modified by the oxidized carbon nanotubes is portland cement with a strength grade of 42.5.
Optionally, the carbon oxide nanotube modified cement-based material is sand with fine aggregate river sand, the fineness modulus of the sand is 2.9-3.15, and the apparent density is 2.6-2.7 kg/m3。
Optionally, the specific surface area of the oxidized carbon nanotube modified cement-based material is 260-420 m2(iii) per kg, density of 2200 to 2800kg/m3。
Optionally, the molecular weight of the sodium lignosulfonate in the oxidized carbon nanotube modified cement-based material is 1200-2500.
Optionally, the preparation method of the carbon oxide nanotube modified cement-based material comprises: mixing concentrated nitric acid and concentrated sulfuric acid, adding the carbon nano tube, refluxing for 2.5-3.5 h at the temperature of 105-125 ℃, filtering, washing and drying to obtain the oxidized carbon nano tube.
Optionally, the carbon nanotube oxide modified cement-based material has a mass-to-volume ratio of (0.2-0.3) mg to 1ml (1-3) ml of concentrated nitric acid.
In a second aspect, the invention also provides a preparation method of the carbon oxide nanotube modified cement-based material, which comprises the following steps:
placing the carbon oxide nano tube into water, ultrasonically stirring and dispersing to obtain a first suspension;
grinding the first suspension to obtain a second suspension;
respectively melting sodium lignosulfonate and polyvinyl alcohol into water, and then adding the mixture into the second suspension for ultrasonic dispersion to obtain a dispersion liquid;
adding cement, sand and fly ash into a stirrer for dry stirring, then adding the dispersion liquid for continuous stirring, and then adding ethylene glycol and a polycarboxylic acid water reducing agent for continuous stirring to obtain a mixture;
and molding and maintaining the mixture to obtain the oxidized carbon nanotube modified cement-based material.
Optionally, in the preparation method of the carbon oxide nanotube modified cement-based material, the carbon oxide nanotube is placed in water, and ultrasonically stirred and dispersed for 30-60 min to obtain a first suspension.
Optionally, in the preparation method of the oxidized carbon nanotube modified cement-based material, a sand mill is used for grinding the first suspension to obtain a second suspension; wherein the rotation speed of the sand mill is 1400-2000 r/min, and the grinding time is 2-3 h.
Compared with the prior art, the carbon oxide nanotube modified cement-based material has the following beneficial effects:
(1) the oxidized carbon nanotube modified cement-based material comprises sodium lignosulfonate, polyvinyl alcohol, an oxidized carbon nanotube, ethylene glycol and the like, wherein the sodium lignosulfonate and the polyvinyl alcohol have good dispersing capacity and a large number of active groups, and can adsorb the carbon nanotube in an aqueous solution and serve as a dispersing medium; meanwhile, sodium lignosulfonate can be dissolved in ethylene glycol and reacts to form a stable dispersion system, so that the carbon nano tube can have longer time and more stable uniform dispersion in the cement-based material, and a large amount of construction in actual engineering is facilitated; meanwhile, the sodium lignosulfonate and the polyvinyl alcohol have good improvement effects on the mechanical properties of the cement-based material, both can greatly improve the fluidity and plasticity of the cement-based material and reduce harmful pores, and particularly, the ethylene glycol can also reduce the hydration heat at the initial stage of cement hydration and has remarkable effect on the early strength. Therefore, the sodium lignosulfonate, the polyvinyl alcohol and the carbon nanotube oxide can form a more stable dispersion system, and the sodium lignosulfonate, the polyvinyl alcohol and the carbon nanotube oxide simultaneously have good water solubility and hydrophilicity, active hydrophilic groups existing in the sodium lignosulfonate and the polyvinyl alcohol and the carbon nanotube oxide functional groups can provide a reliable reaction platform for promoting hydration, promote cement hydration to form a tiny and regular crystal structure, reduce the micropore volume and increase the compactness of a cement-based material; the carbon nano tube is used as an excellent one-dimensional carbon matrix nano material, has excellent mechanical property, material property and extremely fine particle size, is subjected to reasonable oxidation treatment to obtain the oxidized carbon nano tube, is used for improving the dispersion property of the oxidized carbon nano tube in water and cement-based materials, and is added into the cement-based materials to be used as a reinforced cementing material so as to improve the early mechanical property of the cement-based materials;
(2) the preparation method of the carbon oxide nanotube modified cement-based material has good fluidity in the preparation process, can attract and promote the common hydration reaction of the main components of the cement and the fly ash by utilizing the oxygen-containing functional group during the early maintenance period of the fly ash cement-based material, solves the problem of slow coagulation caused by the fact that the fly ash contains granulated blast furnace slag and the content of corresponding clinker is less, and forms a more stable crystal structure through the synergistic reaction; and the excellent material performance and the extremely fine particle size of the material can effectively fill micro pores and cracks in the cement-based material, so that the microstructure of the cement-based composite material is optimized, the problems of insufficient early strength and insufficient long-term stability caused by the doping of the fly ash are effectively inhibited, and the safety and the durability of the cement-based material are improved.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The carbon oxide nanotube modified cement-based material comprises the following raw materials in parts by weight: 160-280 parts of cement, 80-140 parts of water, 480-760 parts of sand, 40-70 parts of fly ash, 9-25 parts of carbon oxide nanotubes, 1-2 parts of polycarboxylic acid water reducing agent, 6-8 parts of polyvinyl alcohol, 5-10 parts of sodium lignosulfonate and 0.5-1 part of ethylene glycol.
In some embodiments, the cement is ordinary portland cement with a strength grade of 42.5.
In some embodiments, the sand is fine aggregate river sand having a fineness modulus of 2.9 to 3.15 and an apparent density of 2.6 to 2.7kg/m3。
In some embodiments, the fly ash has a specific surface area of 260-420 m2(iii) per kg, density of 2200 to 2800kg/m3。
Specifically, the fly ash is classified according to the content of the main component silicon dioxide (52% -63%) of the fly ash, and the components of different types of fly ash are shown in the following table 1.
Table 1-mass fraction of main chemical substances of different types of fly ash (%)
Note: LOI represents the loss on ignition of the fly ash
In some embodiments, the sodium lignosulfonate has a molecular weight of 1200 to 2500. Sodium lignosulfonate is an industrial grade active water-soluble dispersant.
In some embodiments, the method for preparing the oxidized carbon nanotube comprises: mixing concentrated nitric acid and concentrated sulfuric acid, adding the carbon nano tube, refluxing for 2.5-3.5 h at the temperature of 105-125 ℃, filtering, washing and drying to obtain the oxidized carbon nano tube.
In some embodiments, the mass-to-volume ratio of the carbon nanotubes to the concentrated nitric acid to the concentrated sulfuric acid is (0.2-0.3) mg to 1ml to (1-3) ml.
Based on the same inventive concept, the application also provides a preparation method of the carbon oxide nanotube modified cement-based material, which comprises the following steps:
s1, placing the carbon oxide nanotubes into water, and ultrasonically stirring and dispersing to obtain a first suspension;
s2, grinding the first suspension to obtain a second suspension;
s3, respectively melting sodium lignosulfonate and polyvinyl alcohol into water, and then adding the mixture into the second suspension for ultrasonic dispersion to obtain a dispersion liquid;
s4, adding the cement, the sand and the fly ash into a stirrer for dry stirring, then adding the dispersion liquid for continuous stirring, and then adding the ethylene glycol and the polycarboxylic acid water reducing agent for continuous stirring to obtain a mixture;
and S5, molding and maintaining the mixture to obtain the carbon oxide nanotube modified cement-based material.
In some embodiments, the carbon oxide nanotubes are placed in water and ultrasonically stirred and dispersed for 30-60 min to obtain a first suspension.
In some embodiments, the first suspension is ground using a sand mill to obtain a second suspension; wherein the rotation speed of the sand mill is 1400-2000 r/min, and the grinding time is 2-3 h.
According to the preparation method of the carbon oxide nanotube modified cement-based material, sodium lignosulfonate and polyvinyl alcohol are respectively added into the carbon oxide nanotube suspension after being respectively dissolved into water, and then treated by ultrasonic bath with lower power, and stirred at room temperature to be completely dissolved, so that the obtained uniform carbon oxide nanotube suspension is favorable for dispersion in the cement-based material; then adding the cement, river sand and fly ash into a stirrer for dry stirring for a period of time, uniformly mixing the framework structure in the early-stage cement-based material, and ensuring good fluidity after adding the subsequent raw materials; then adding the carbon oxide nanotube suspension and the rest water, mixing and continuously stirring to ensure that the carbon oxide nanotube suspension and the rest water are more fully and uniformly mixed and reacted with the dry material frame obtained in the earlier stage, ensuring the compactness of the finally prepared cement-based material, and avoiding the defects of more obvious honeycombs, cavities and uneven flow; and finally, adding a small amount of ethylene glycol and a polycarboxylic acid water reducing agent, and ensuring the fluidity and uniformity of the slurry in the whole stirring process so as to improve the stability and strength of the carbon oxide nanotube modified cement-based material.
According to the preparation method of the oxidized carbon nanotube modified cement-based material, the adopted carbon nanotube is subjected to pre-oxidation treatment by using mixed acid of concentrated sulfuric acid and concentrated nitric acid, so that the carbon nanotube has a certain amount of hydrophilic oxygen-containing functional groups, and is supplemented with a certain amount of sodium lignosulfonate and polyvinyl alcohol, so that the carbon nanotube material is uniformly dispersed in the cement-based material; the sodium lignosulfonate and the polyvinyl alcohol have good dispersing capacity and a large number of active groups, can adsorb the carbon nano tube in an aqueous solution and serve as a dispersing medium of the carbon nano tube, particularly, the sodium lignosulfonate can be dissolved in ethylene glycol and react to form a stable dispersing system, so that the carbon nano tube can have longer-term and more stable uniform dispersion in a cement-based material, and a large number of constructions in actual engineering are facilitated; meanwhile, the sodium lignosulfonate and the polyvinyl alcohol have good improvement effects on the mechanical properties of the cement-based material, both can greatly improve the fluidity and plasticity of the cement-based material and reduce harmful pores, and particularly, the ethylene glycol can also reduce the hydration heat at the initial stage of cement hydration and has remarkable effect on the early strength. Therefore, the sodium lignosulfonate, the polyvinyl alcohol and the carbon nanotube oxide can form a more stable dispersion system, and the sodium lignosulfonate, the polyvinyl alcohol and the carbon nanotube oxide simultaneously have good water solubility and hydrophilicity, active hydrophilic groups existing in the sodium lignosulfonate and the polyvinyl alcohol and the carbon nanotube oxide functional groups can provide a reliable reaction platform for promoting hydration, promote cement hydration to form a tiny and regular crystal structure, reduce the micropore volume and increase the compactness of a cement-based material. The oxidized carbon nanotube modified cement-based material disclosed by the invention uses industrial sodium lignosulfonate and fly ash which are industrial wastes, is environment-friendly and energy-saving, can solve the problem that the industrial wastes cannot be effectively utilized, saves the preparation cost of the cement-based composite material, has good mechanical properties, adopts polyvinyl alcohol and ethylene glycol which are green and harmless substances, meets the concept of an environment-friendly society and the target of sustainable development, and has positive environmental significance and social significance.
The preparation method of the carbon oxide nanotube modified cement-based material has good fluidity in the preparation process, can attract and promote the common hydration reaction of the main components of the cement and the fly ash by utilizing the oxygen-containing functional group during the early maintenance period of the fly ash cement-based material, solves the problem of slow coagulation caused by the fact that the fly ash contains granulated blast furnace slag and the content of corresponding clinker is less, and forms a more stable crystal structure through the synergistic reaction; and the excellent material performance and the extremely fine particle size of the material can effectively fill micro pores and cracks in the cement-based material, so that the microstructure of the cement-based composite material is optimized, the problems of insufficient early strength and insufficient long-term stability caused by the doping of the fly ash are effectively inhibited, and the safety and the durability of the cement-based material are improved.
The following further describes the preparation method of the carbon nanotube oxide modified cement-based material according to the present application with specific examples.
Example 1
The embodiment of the application provides a preparation method of a carbon oxide nanotube modified cement-based material, which comprises the following steps:
s1, firstly weighing 200ml of concentrated nitric acid at room temperature, slowly adding 600ml of concentrated sulfuric acid, and stirring for 2 hours while adding; slowly adding 25g of weighed carbon nanotube powder, performing oil bath heating reflux for 3 hours at the temperature of 110 ℃, and stirring all the time in the heating process; after the reflux is finished, repeatedly filtering and washing until the pH value of the filtrate is close to 7; drying the filtered powder in a forced air drying oven at a constant temperature of 110 ℃ for 8h to obtain the carbon oxide nanotube;
s2, adding the carbon oxide nanotubes prepared in the S1 into 70 parts by weight of water, and performing ultrasonic dispersion for 40min under the power of 500W to obtain a first suspension;
s3, grinding the first suspension for 2 hours by using a sand mill at the rotation speed of 1700r/min, and ultrasonically dispersing for 1 hour under the ultrasonic condition with the power of 800w to obtain a second suspension;
s4, respectively dissolving 7 parts by weight of polyvinyl alcohol and 7 parts by weight of sodium lignosulfonate in 10 parts by weight of water to obtain a polyvinyl alcohol solution and a sodium lignosulfonate solution, respectively adding the polyvinyl alcohol solution and the sodium lignosulfonate solution into the second suspension, and dispersing for 1.5 hours under 300W ultrasound to obtain a dispersion liquid;
s5, adding 215 parts by weight of cement, 640 parts by weight of sand and 54 parts by weight of fly ash (number FA1) into a stirrer, stirring for 30 hours, then adding the dispersion liquid, stirring continuously, adding 0.8 part by weight of ethylene glycol and 1.5 parts by weight of polycarboxylic acid water reducing agent, and stirring continuously to obtain a mixture;
and S6, conveying the mixture into a mold, leveling after filling, covering with a preservative film, removing the mold after curing, and curing to obtain the carbon oxide nanotube modified cement-based material.
Example 2
The method for preparing the carbon oxide nanotube modified cement-based material provided in this embodiment is the same as that in embodiment 1, except that the fly ash used is FA 3.
Example 3
The method for preparing the carbon oxide nanotube modified cement-based material provided in this embodiment is the same as that in embodiment 1, except that the fly ash used is FA 5.
Comparative example 1
The preparation method of the ordinary fly ash cement-based composite material provided by the comparative example is the same as that of example 1, except that the carbon oxide nanotubes are not added.
Comparative example 2
The preparation method of the ordinary fly ash cement-based composite material provided by the comparative example is the same as that of example 2, except that the carbon oxide nanotubes are not added.
Comparative example 3
The preparation method of the ordinary fly ash cement-based composite material provided by the comparative example is the same as that of example 3, except that the carbon oxide nanotubes are not added.
Comparative example 4
The cement-based material modified with carbon nanotubes prepared by this comparative example was prepared in the same manner as example 1, except that 15g of carbon nanotubes were used and carbon nanotubes were not used.
Comparative example 5
The cement-based material modified with carbon nanotubes prepared by this comparative example was prepared in the same manner as example 1, except that 25g of carbon nanotubes were used and carbon nanotubes were not used.
Comparative example 6
The preparation method of the carbon oxide nanotube modified cement-based material provided by the comparative example is the same as that of example 1, except that sodium lignosulfonate is not used.
Comparative example 7
The preparation method of the carbon oxide nanotube modified cement-based material provided by the comparative example is the same as example 1, except that polyvinyl alcohol is not used.
The carbon oxide nanotube modified cement-based materials prepared in the above examples 1 to 3 and comparative examples 1 to 7 were tested for their respective properties according to the standard of GB/T50081-2002 Standard for testing mechanical Properties of ordinary concrete, and the results are shown in Table 2 below.
TABLE 2-Properties of the Cement-based Material modified by oxidized carbon nanotubes prepared in the different examples
As can be seen from Table 2, the compressive strengths of 7, 28 and 56 days and the flexural strengths of 7 and 28 days of the carbon oxide nanotube modified cement-based materials of different fly ash types prepared in examples 1 to 3 are significantly improved compared with the mechanical properties of the ordinary fly ash cement-based composite materials in comparative examples 1 to 3, and particularly, the early mechanical properties of the fly ash cement-based materials doped with carbon oxide nanotubes are greatly improved in the mechanical property value of the 7-day curing period; compared with the formulas of examples 1 to 3, the formula of the common fly ash cement-based composite material in the comparative examples 1 to 3 has the advantages that after a certain amount of carbon oxide nanotube suspension is added, the early strength and the mechanical property stability under long-term maintenance are obviously improved and optimized, so that the formula of the carbon oxide nanotube/fly ash composite material cement-based composite material can effectively promote the early strength and the long-term mechanical property stability of different types of fly ash cement composite materials when the carbon oxide nanotube suspension is added in a proper proportion; compared with the formula of example 1, the formula of the cement-based material prepared in comparative examples 4-5 uses the carbon nanotube material subjected to oxidation treatment, so that the early strength and the mechanical property under long-term maintenance of the fly ash cement-based composite material at the moment are slightly higher than those of the common fly ash cement-based composite material in comparative examples 1-3, but are far lower than the strength values of different ages measured by using the carbon nanotube oxide in examples 1-3, and the scientificity and authenticity of the carbon nanotube oxide-treated cement-based composite material for improving the early strength and the long-term mechanical property stability are further verified; compared with the formula of example 1, the cement-based material prepared in the comparative examples 6 to 7 respectively uses the singly doped sodium lignosulfonate and the polyvinyl alcohol material, the early strength and the mechanical property stability under long-term maintenance are slightly reduced, but are still better than the strength values of different ages measured in comparative examples 1-5, which shows that sodium lignosulfonate and polyvinyl alcohol can form a stable dispersion system with the carbon oxide nanotube independently, and when the sodium lignosulfonate, the polyvinyl alcohol and the carbon oxide nano tube coexist, a more stable dispersion system can be formed, and the active hydrophilic group and the oxygen-containing functional group of the carbon nano tube can promote hydration and provide a reliable reaction platform, and the reliable reaction platform can promote the hydration rate, thereby greatly improving various strength values and long-term stability of the cement-based composite material.
Mechanical property tests of the carbon oxide nanotube modified cement-based material prepared in the embodiments 1 to 3 meet various technical requirements of standard composite materials of GB/T50081-2002 Standard test method for mechanical properties of ordinary concrete, wherein the embodiments 1 to 3 realize the effects of greatly improving and optimizing the early strength and the long-term stability of mechanical properties of the fly ash cement-based composite materials.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The carbon oxide nanotube modified cement-based material is characterized by comprising the following raw materials in parts by weight: 160-280 parts of cement, 80-140 parts of water, 480-760 parts of sand, 40-70 parts of fly ash, 9-25 parts of carbon oxide nanotubes, 1-2 parts of polycarboxylic acid water reducing agent, 6-8 parts of polyvinyl alcohol, 5-10 parts of sodium lignosulfonate and 0.5-1 part of ethylene glycol.
2. The oxidized carbon nanotube modified cementitious material of claim 1, wherein the cement is a portland cement having a strength grade of 42.5.
3. The carbon oxide nanotube modified cement-based material of claim 1, wherein the sand is fine aggregate river sand, the fineness modulus of the sand is 2.9 to 3.15, and the apparent density is 2.6 to 2.7kg/m3。
4. The carbon oxide nanotube modified cement-based material of claim 1, wherein the fly ash has a specific surface area of 260 to 420m2(iii) per kg, density of 2200 to 2800kg/m3。
5. The carbon oxide nanotube modified cement-based material of claim 1, wherein the sodium lignosulfonate has a molecular weight of 1200 to 2500.
6. The carbon oxide nanotube modified cement-based material of claim 1, wherein the carbon oxide nanotubes are prepared by a method comprising: mixing concentrated nitric acid and concentrated sulfuric acid, adding the carbon nano tube, refluxing for 2.5-3.5 h at the temperature of 105-125 ℃, filtering, washing and drying to obtain the oxidized carbon nano tube.
7. The carbon nanotube oxide modified cement-based material of claim 6, wherein the mass-to-volume ratio of the carbon nanotubes, the concentrated nitric acid and the concentrated sulfuric acid is (0.2-0.3) mg:1ml (1-3) ml.
8. A preparation method of a carbon oxide nanotube modified cement-based material is characterized by comprising the following steps:
placing the carbon oxide nano tube into water, ultrasonically stirring and dispersing to obtain a first suspension;
grinding the first suspension to obtain a second suspension;
respectively melting sodium lignosulfonate and polyvinyl alcohol into water, and then adding the mixture into the second suspension for ultrasonic dispersion to obtain a dispersion liquid;
adding cement, sand and fly ash into a stirrer for dry stirring, then adding the dispersion liquid for continuous stirring, and then adding ethylene glycol and a polycarboxylic acid water reducing agent for continuous stirring to obtain a mixture;
and molding and maintaining the mixture to obtain the oxidized carbon nanotube modified cement-based material.
9. The method for preparing a carbon oxide nanotube-modified cement-based material according to claim 8, wherein the carbon oxide nanotubes are placed in water and ultrasonically stirred and dispersed for 30 to 60 minutes to obtain a first suspension.
10. The method of claim 8, wherein the grinding of the first suspension using a sand mill produces a second suspension; wherein the rotation speed of the sand mill is 1400-2000 r/min, and the grinding time is 2-3 h.
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| CN117735869A (en) * | 2024-02-21 | 2024-03-22 | 北京安科兴业科技股份有限公司 | Carbon nano tube reinforced magnesium silicate cementing material and preparation method thereof |
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