CN114149211B - Cement-based composite material based on multi-wall carbon nano tube and preparation method thereof - Google Patents

Cement-based composite material based on multi-wall carbon nano tube and preparation method thereof Download PDF

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CN114149211B
CN114149211B CN202111460663.8A CN202111460663A CN114149211B CN 114149211 B CN114149211 B CN 114149211B CN 202111460663 A CN202111460663 A CN 202111460663A CN 114149211 B CN114149211 B CN 114149211B
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cement
carbon nano
styrene
walled carbon
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CN114149211A (en
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邓辰星
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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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
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/022—Carbon
    • C04B14/024—Graphite
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/022—Carbon
    • C04B14/026—Carbon of particular shape, e.g. nanotubes
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38—Fibrous materials; Whiskers
    • C04B14/386—Carbon
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/90—Electrical properties
    • C04B2111/94—Electrically conducting materials
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Nanotechnology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention provides a cement-based composite material based on multi-walled carbon nanotubes and a preparation method thereof, which relate to the technical field of cement materials and comprise the following components: 850-950 parts of cement; 750-800 parts of fine sand; 350-400 parts of silicon powder; 220-250 parts of styrene-butadiene rubber emulsion; 5-10 parts of multi-wall carbon nano tubes; 40-50 parts of carbon fiber; 10-15 parts of a water reducing agent; 5-8 parts of a defoaming agent; 20-30 parts of graphite. The invention has the beneficial effects that the graphite and the carbon fiber can provide good electric conductivity, the styrene-butadiene rubber emulsion and the multi-walled carbon nano tube are used as a composite matrix to improve the hydration process of cement, and after the styrene-butadiene rubber emulsion reacts with the cement, the cement hydration product can wrap the multi-walled carbon nano tube, and the multi-walled carbon nano tube has larger length-diameter ratio, thus being beneficial to enhancing the bonding strength of an interface and the mechanical strength of the cement, so that the material has better electric conductivity and compressive strength.

Description

Cement-based composite material based on multi-wall carbon nano tube and preparation method thereof
Technical Field
The invention relates to the technical field of cement materials, in particular to a cement-based composite material based on multi-wall carbon nano tubes and a preparation method thereof.
Background
Cement concrete structures are currently the most widely used form of construction in the world. With the large-scale, high-rise and multifunctional modern engineering structures, as a structural material used to the maximum, cement concrete gradually develops from a traditional structural material only with bearing capacity to the directions of green, sustainability, high strength, high performance, ultra-composite, ultra-durability, intellectualization and the like.
The conductive cement material has wide development field and application space due to the conductive performance and the advantages of the concrete in technology and performance. The conductive cement is a composite material formed by mixing gel materials (usually cement), conductive materials, dielectric aggregates, water, other additives and the like according to a certain mixing ratio.
Although the conductivity of the conductive cement material in the prior art is improved, the compressive strength of the material is poor, and the development and application of the conductive cement material are limited.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art and provides a cement-based composite material based on multi-wall carbon nano tubes and a preparation method thereof.
The technical solution of the invention is as follows:
a cement-based composite material based on multi-wall carbon nano tubes comprises the following components in parts by weight:
850-950 parts of cement;
750-800 parts of fine sand;
350-400 parts of silicon powder;
220-250 parts of styrene-butadiene rubber emulsion;
5-10 parts of multi-wall carbon nano tubes;
40-50 parts of carbon fiber;
10-15 parts of a water reducing agent;
5-8 parts of a defoaming agent;
20-30 parts of graphite.
The invention relates to a specific implementation mode, which comprises the following components in parts by weight:
880-920 parts of cement;
760-790 parts of fine sand;
360-390 parts of silicon powder;
230-240 parts of styrene-butadiene rubber emulsion;
6-9 parts of a multi-walled carbon nanotube;
42-48 parts of carbon fiber;
11-14 parts of a water reducing agent;
6-7 parts of a defoaming agent;
22-28 parts of graphite.
The invention relates to a specific implementation mode, which comprises the following components in parts by weight:
900 parts of cement;
780 parts of fine sand;
370 parts of silicon powder;
235 parts of styrene-butadiene rubber emulsion;
7 parts of multi-wall carbon nano tubes;
45 parts of carbon fibers;
12 parts of a water reducing agent;
6.5 parts of a defoaming agent;
and 25 parts of graphite.
One embodiment of the present invention further includes at least one of the following additional features:
the outer diameter of the multi-walled carbon nano-tube is 10-20 nm;
the ratio of carboxyl in the multi-wall carbon nano tube is 2.5 to 3 weight percent.
According to a specific embodiment of the invention, the silicon powder comprises the following components in percentage by weight: 95.3 to 96.5% of SiO 2 、0.5～0.8％Fe 2 O 3 、1.7～2.2％MgO、1.1～1.8％SO 3 。
One embodiment of the present invention further includes at least one of the following additional features:
the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent;
the defoaming agent is a polycarboxylic acid defoaming agent.
In one embodiment of the present invention, the pH of the antifoaming agent is 7 to 8.
In a specific embodiment of the invention, the styrene-butadiene rubber emulsion has a solid content of 54-58%.
In a specific embodiment of the present invention, the fine sand has a particle size of 1.15mm or less.
A preparation method of a cement-based composite material based on multi-wall carbon nano tubes comprises the following steps:
adding the multi-walled carbon nano-tube into styrene butadiene rubber emulsion, adding water and stirring;
carrying out ultrasonic treatment in a water bath at 65-70 ℃ for 1-1.5 hours, and stirring once every 20min in the ultrasonic process, wherein the stirring lasts for 2min each time, so as to prepare a styrene butadiene rubber emulsion/multi-walled carbon nanotube suspension;
pouring cement, fine sand, silicon powder, graphite and carbon fiber into a mortar stirrer to be dry-stirred for 2-5 min,
adding a water reducing agent and water into the stirrer, and continuously stirring for 5-10 min;
adding the styrene butadiene rubber emulsion/multi-walled carbon nanotube suspension and the defoamer into the stirrer, and continuing stirring for 5-10 min;
pouring the mixture into a steel mould, filling the mould, and then placing the mould on a vibration table to vibrate for 1-3 min;
pressurizing the mixture in the mold to remove bubbles, then scraping the surface, and curing in a curing chamber for 24-36 h;
demolding, and curing for 28-30 d to finish the preparation of the cement-based composite material based on the multi-wall carbon nano tube.
The invention has at least one of the following beneficial effects:
the cement-based composite material based on the multi-walled carbon nano-tubes has good conductivity and compressive strength, wherein the graphite and the carbon fibers can provide good conductivity, the styrene-butadiene rubber emulsion and the multi-walled carbon nano-tubes have good dispersibility in cement, the styrene-butadiene rubber emulsion and the multi-walled carbon nano-tubes serve as a composite matrix to improve the hydration process of the cement, meanwhile, after the styrene-butadiene rubber emulsion reacts with the cement, the cement hydration product can wrap the multi-walled carbon nano-tubes, and meanwhile, the multi-walled carbon nano-tubes have a large length-diameter ratio, so that a large bonding area can be obtained, the interface bonding strength can be enhanced, the mechanical strength of the cement can be enhanced, and finally the material has good conductivity and compressive strength.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples.
Example one
A cement-based composite material based on multi-wall carbon nano tubes comprises the following components in parts by weight:
880 parts of cement;
780 parts of fine sand;
350 parts of silicon powder;
230 parts of styrene-butadiene rubber emulsion;
6 parts of multi-wall carbon nano tubes;
40 parts of carbon fiber;
12 parts of a water reducing agent;
5 parts of a defoaming agent;
and 20 parts of graphite.
Wherein the outer diameter of the multi-walled carbon nano-tube is 15-20 nm.
Wherein the ratio of carboxyl in the multi-wall carbon nano tube is 2.5 to 3wt percent.
The silicon powder comprises the following components in percentage by weight: 95.3% of SiO 2 、0.8％Fe 2 O 3 、2.2％MgO、1.7％SO 3 。
Wherein the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
Wherein the defoaming agent is a polycarboxylic acid defoaming agent.
Wherein the pH of the defoamer is 7.5.
Wherein the solid content of the styrene-butadiene rubber emulsion is 56%.
Wherein the grain diameter of the fine sand is less than or equal to 1.15mm.
The preparation method of the cement-based composite material based on the multi-walled carbon nanotube of the embodiment comprises the following steps:
adding the weighed multi-walled carbon nano-tubes into the weighed styrene-butadiene rubber emulsion, adding 20 parts of water and stirring;
carrying out ultrasonic treatment for 1 hour in a water bath at 65 ℃, stirring once every 20min in the ultrasonic process, and keeping stirring for 2min each time to prepare styrene butadiene rubber emulsion/multi-walled carbon nanotube suspension;
pouring the weighed cement, fine sand, silicon powder, graphite and carbon fiber into a mortar stirrer for dry stirring for 2min,
adding a water reducing agent and 380 parts of water into the stirrer, and continuously stirring for 5min;
adding the styrene-butadiene rubber emulsion/multi-walled carbon nanotube suspension and the defoaming agent into the stirrer, and continuing stirring for 5min;
pouring the mixture into a steel mould, filling the mould, and then placing the mould on a vibration table to vibrate for 1min;
pressurizing the mixture in the mold to remove bubbles, then scraping the surface, and curing in a curing chamber for 24 hours;
and demolding, and curing for 28d to finish the preparation of the cement-based composite material based on the multi-wall carbon nano tube.
Example two
A cement-based composite material based on multi-wall carbon nano tubes comprises the following components in parts by weight:
850 parts of cement;
800 parts of fine sand;
390 parts of silicon powder;
20 parts of styrene-butadiene rubber emulsion;
5 parts of multi-wall carbon nano tubes;
45 parts of carbon fiber;
15 parts of a water reducing agent;
8 parts of a defoaming agent;
and 25 parts of graphite.
Wherein the outer diameter of the multi-walled carbon nano-tube is 10-18 nm.
Wherein the ratio of carboxyl in the multi-wall carbon nano tube is 2.5 to 3wt percent.
The silicon powder comprises the following components in percentage by weight: 95.8% of SiO 2 、0.7％Fe 2 O 3 、2.1％MgO、1.4％SO 3 。
Wherein the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
Wherein the defoaming agent is a polycarboxylic acid defoaming agent.
Wherein the defoamer has a pH of 7.
Wherein the solid content of the styrene-butadiene rubber emulsion is 54 percent.
Wherein the grain diameter of the fine sand is less than or equal to 1.15mm.
The preparation method of the cement-based composite material based on the multi-walled carbon nanotube of the embodiment comprises the following steps:
adding the weighed multi-walled carbon nano-tubes into the weighed butadiene styrene rubber emulsion, adding 20 parts of water and stirring;
carrying out ultrasonic treatment for 1 hour in a water bath at the temperature of 66 ℃, and stirring once every 20min in the ultrasonic process, wherein the stirring lasts for 2min each time, so as to prepare styrene butadiene rubber emulsion/multi-walled carbon nanotube suspension;
pouring the weighed cement, fine sand, silica powder, graphite and carbon fiber into a mortar stirrer to be dry-stirred for 3min,
adding a water reducing agent and 380 parts of water into the stirrer, and continuously stirring for 6min;
adding the styrene-butadiene rubber emulsion/multi-walled carbon nanotube suspension and the defoaming agent into the stirrer, and continuously stirring for 6min;
pouring the mixture into a steel mould, filling the mould, and then placing the mould on a vibration table to vibrate for 2min;
pressurizing the mixture in the mold to remove bubbles, then scraping the surface, and curing in a curing chamber for 28h;
and demolding, and curing for 28d to finish the preparation of the cement-based composite material based on the multi-wall carbon nano tube.
EXAMPLE III
A cement-based composite material based on multi-wall carbon nano tubes comprises the following components in parts by weight:
950 parts of cement;
750 parts of fine sand;
400 parts of silicon powder;
250 parts of styrene-butadiene rubber emulsion;
10 parts of multi-wall carbon nano tubes;
47 parts of carbon fiber;
10 parts of a water reducing agent;
7 parts of a defoaming agent;
28 parts of graphite.
Wherein the outer diameter of the multi-walled carbon nano-tube is 16-19 nm.
Wherein the ratio of carboxyl in the multi-wall carbon nano tube is 2.5 to 3wt percent.
The silicon powder comprises the following components in percentage by weight: 96.2% of SiO 2 、0.6％Fe 2 O 3 、1.9％MgO、1.3％SO 3 。
Wherein the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
Wherein the defoaming agent is a polycarboxylic acid defoaming agent.
Wherein the defoamer has a pH of 8.
Wherein the solid content of the styrene-butadiene rubber emulsion is 54 percent.
Wherein the grain diameter of the fine sand is less than or equal to 1.15mm.
The preparation method of the cement-based composite material based on the multi-walled carbon nanotube of the embodiment comprises the following steps:
adding the weighed multi-walled carbon nano-tubes into the weighed styrene-butadiene rubber emulsion, adding 20 parts of water and stirring;
carrying out ultrasonic treatment for 1.4 hours in a water bath at 68 ℃, stirring once every 20min in the ultrasonic process, and stirring for 2min each time to prepare styrene-butadiene rubber emulsion/multi-walled carbon nanotube suspension;
pouring the weighed cement, fine sand, silica powder, graphite and carbon fiber into a mortar stirrer to be dry-stirred for 4min,
adding a water reducing agent and 380 parts of water into the stirrer, and continuously stirring for 9min;
adding the styrene butadiene rubber emulsion/multi-walled carbon nanotube suspension and the defoamer into the stirrer, and continuing stirring for 10min;
pouring the mixture into a steel mould, filling the mould, and then placing the mould on a vibration table to vibrate for 3min;
pressurizing the mixture in the mold to remove bubbles, then scraping the surface, and curing for 36h in a curing chamber;
and demolding, and curing for 30d to finish the preparation of the cement-based composite material based on the multi-wall carbon nano tube.
Example four
A cement-based composite material based on multi-walled carbon nanotubes comprises the following components in parts by weight:
900 parts of cement;
770 parts of fine sand;
360 parts of silicon powder;
245 parts of styrene-butadiene rubber emulsion;
9 parts of multi-wall carbon nano tubes;
50 parts of carbon fiber;
11 parts of a water reducing agent;
6 parts of a defoaming agent;
30 parts of graphite.
Wherein the outer diameter of the multi-walled carbon nano-tube is 10-17 nm.
Wherein the ratio of carboxyl in the multi-wall carbon nano tube is 2.5 to 3wt percent.
The silicon powder comprises the following components in percentage by weight: 96.5% of SiO 2 、0.5％Fe 2 O 3 、1.7％MgO、1.3％SO 3 。
Wherein the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
Wherein the defoaming agent is a polycarboxylic acid defoaming agent.
Wherein the defoamer has a pH of 7.
Wherein the solid content of the styrene-butadiene rubber emulsion is 58%.
Wherein the grain diameter of the fine sand is less than or equal to 1.15mm.
The preparation method of the cement-based composite material based on the multi-walled carbon nanotube of the embodiment comprises the following steps:
adding the weighed multi-walled carbon nano-tubes into the weighed butadiene styrene rubber emulsion, adding 20 parts of water and stirring;
carrying out ultrasonic treatment in a water bath at 70 ℃ for 1.5 hours, and stirring once every 20min in the ultrasonic process, wherein the stirring lasts for 2min each time, so as to prepare a styrene butadiene rubber emulsion/multi-walled carbon nanotube suspension;
pouring the weighed cement, fine sand, silicon powder, graphite and carbon fiber into a mortar stirrer for dry stirring for 4min,
adding a water reducing agent and 380 parts of water into the stirrer, and continuously stirring for 9min;
adding the styrene butadiene rubber emulsion/multi-walled carbon nanotube suspension and the defoamer into the stirrer, and continuing stirring for 9min;
pouring the mixture into a steel mould, filling the mould, and then placing on a vibration table to vibrate for 2min;
pressurizing the mixture in the mold to remove bubbles, then scraping the surface, and curing in a curing chamber for 32 hours;
and demolding, and maintaining for 29d to finish the preparation of the cement-based composite material based on the multi-wall carbon nano tube.
Comparative example 1
The difference from example 1 is that: the components of styrene-butadiene rubber emulsion and multi-walled carbon nano-tubes are not added, and the rest is the same as that of the embodiment 1.
Comparative example 2
The difference from example 1 is that: the components graphite and carbon fiber were not added, and the rest was the same as in example 1.
Testing of
The electric resistance of the cement-based composite materials prepared in examples 1 to 4 and comparative examples 1 to 2 in the 30d age period was measured, and the electric resistivity thereof was calculated; and the cement-based composite materials prepared in examples 1 to 4 and comparative examples 1 to 2 were tested for 30 d-age compressive strength by a compression tester, and the area under pressure was 50mm x 50m, with the results shown in Table 1:
TABLE 1
Figure BDA0003388455620000081
The resistivity and compressive strength of the cement-based composite material in the 30d age are compared in the above four embodiments and the prior art under the same test conditions, and it is obvious from table 1 that the resistivity of the cement-based composite material based on the multi-walled carbon nanotubes in the four embodiments of the present invention is obviously lower than that of the prior art, the compressive strength is obviously better than that of the prior art, and the performance is excellent, so that the cement-based composite material prepared by the present invention has better conductivity and compressive strength compared with the prior art.
Comparing example 1 with comparative examples 1-2, it can be seen that the resistivity of comparative example 1 (without adding styrene-butadiene rubber emulsion, multi-walled carbon nanotubes) is equivalent to that of example 1, but the compressive strength is significantly lower than that of example 1, thereby indicating that whether adding styrene-butadiene rubber emulsion, multi-walled carbon nanotubes affects the mechanical strength of cement; the resistivity of a comparative example 2 (without adding graphite and carbon fiber) is obviously greater than that of the example 1, but the compressive strength is equivalent to that of the example 1, so that whether the addition of the graphite and the carbon fiber influences the conductivity of the cement is shown.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (6)

1. The cement-based composite material based on the multi-wall carbon nano tubes is characterized by comprising the following components in parts by weight:
850-950 parts of cement;
750-800 parts of fine sand;
350-400 parts of silicon powder;
220-250 parts of styrene butadiene rubber emulsion;
5-10 parts of multi-wall carbon nano tubes;
40-50 parts of carbon fiber;
10-15 parts of a water reducing agent;
5-8 parts of a defoaming agent;
20-30 parts of graphite;
the outer diameter of the multi-walled carbon nano-tube is 10-20 nm; the ratio of carboxyl in the multi-wall carbon nano tube is 2.5 to 3 weight percent;
the silicon powder comprises the following components in percentage by weight: 95.3 to 96.5% of SiO 2 、0.5～0.8％Fe 2 O 3 、1.7～2.2％MgO、1.1～1.8％SO 3 ；
The solid content of the styrene-butadiene rubber emulsion is 54-58%;
the grain size of the fine sand is less than or equal to 1.15mm.
2. The multi-walled carbon nanotube based cement-based composite material as claimed in claim 1, comprising the following components in parts by weight:
880-920 parts of cement;
760-790 parts of fine sand;
360-390 parts of silicon powder;
230-240 parts of styrene-butadiene rubber emulsion;
6-9 parts of multi-walled carbon nanotubes;
42-48 parts of carbon fiber;
11-14 parts of a water reducing agent;
6-7 parts of a defoaming agent;
22-28 parts of graphite.
3. The multi-walled carbon nanotube based cement-based composite material as claimed in claim 1, comprising the following components in parts by weight:
900 parts of cement;
780 parts of fine sand;
370 parts of silicon powder;
235 parts of styrene-butadiene rubber emulsion;
7 parts of multi-wall carbon nano tubes;
45 parts of carbon fiber;
12 parts of a water reducing agent;
6.5 parts of a defoaming agent;
and 25 parts of graphite.
4. The multi-walled carbon nanotube-based cement-based composite material as claimed in claim 1, further comprising at least one of the following additional technical features:
the water reducing agent is a polycarboxylic acid water reducing agent;
the defoaming agent is a polycarboxylic acid defoaming agent.
5. The multi-walled carbon nanotube-based cement-based composite material as claimed in claim 1, wherein said antifoaming agent has a pH of 7 to 8.
6. A preparation method of a cement-based composite material based on multi-wall carbon nano tubes is characterized by comprising the following steps:
adding the multi-walled carbon nano-tube into styrene butadiene rubber emulsion, adding water and stirring;
carrying out ultrasonic treatment in a water bath at 65-70 ℃ for 1-1.5 hours, and stirring once every 20min in the ultrasonic process, wherein the stirring lasts for 2min each time, so as to prepare styrene-butadiene rubber emulsion/multi-walled carbon nanotube suspension;
pouring cement, fine sand, silicon powder, graphite and carbon fiber into a mortar stirrer to be dry-stirred for 2-5 min,
adding a water reducing agent and water into the stirrer, and continuously stirring for 5-10 min;
adding the styrene-butadiene rubber emulsion/multi-walled carbon nanotube suspension and the defoaming agent into the stirrer, and continuously stirring for 5-10 min;
pouring the mixture into a steel mould, filling the mould, and then placing the mould on a vibration table to vibrate for 1-3 min;
pressurizing the mixture in the mold to eliminate bubbles, then scraping the surface, and curing in a curing chamber for 24-36 h;
demolding, and curing for 28-30 d to finish the preparation of the cement-based composite material based on the multi-wall carbon nano tube.
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