CN110550919A - method for improving chloride ion permeation resistance of cement-based material - Google Patents
method for improving chloride ion permeation resistance of cement-based material Download PDFInfo
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- CN110550919A CN110550919A CN201910936621.3A CN201910936621A CN110550919A CN 110550919 A CN110550919 A CN 110550919A CN 201910936621 A CN201910936621 A CN 201910936621A CN 110550919 A CN110550919 A CN 110550919A
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- cement
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- nano tube
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- C04B28/06—Aluminous 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
a method for improving the chloride ion permeation resistance of a cement-based material relates to the field of chloride ion permeation resistant materials. The invention takes cement as a matrix material, wherein the matrix material mainly comprises high belite sulphoaluminate cement, and the composite material comprises the following components in percentage by mass: 0.1-0.5 part of modified carbon nano tube, 500 parts of high belite sulphoaluminate cement, 250 parts of water, 1200 parts of standard sand and 1400 parts of surfactant and 0.2-0.4 part of surfactant. The method for improving the chloride ion permeation resistance of the cement-based material improves the chloride ion permeation resistance compared with a high belite sulphoaluminate cement-based material without adding carbon nano tubes.
Description
Technical Field
The invention belongs to the field of chloride ion permeation resistant materials, and particularly relates to a method for improving chloride ion permeation resistant capability of a cement-based material.
Background
In recent decades, along with the continuous development of economy in China, more and more requirements are put on high-performance cement, and particularly in ocean engineering, the construction is damaged due to the fact that the construction is damaged by the erosion of severe weather and seawater for a long time, and the engineering structure is damaged. Therefore, the problems to be solved by ocean engineering are that the compactness of the building material is improved, the porosity is reduced, and the chloride ion penetration resistance is improved.
with the development of science and technology, the nano material is receiving more and more attention, wherein the carbon nano tube is a new nano material with excellent properties in thermal, electrical, chemical and mechanical aspects. However, since the specific surface area is too large, the particles are generally agglomerated and cannot exhibit their own excellent properties. Compared with the traditional cement-based material, the addition of the carbon nano tube into the cement can improve the porosity and the chloride ion permeation resistance, and is more favorable for the application in ocean engineering.
The invention provides a method for improving the chloride ion permeation resistance of a cement-based material, which has low preparation cost and good chloride ion permeation resistance.
Disclosure of Invention
The purpose of the invention is realized by the following technical scheme:
A method for improving the chloride ion penetration resistance of a cement-based material is characterized by mainly comprising the following steps:
The method for improving the chloride ion penetration resistance of the cement-based material comprises the following components in parts:
0.1-0.5 part of modified carbon nano tube, 500 parts of high belite sulphoaluminate cement, 250 parts of water, 1200 parts of standard sand and 1400 parts of surfactant and 0.2-0.4 part of surfactant.
the preparation method of the modified carbon nano tube comprises the following steps: placing the carbon nano tube in mixed acid, heating to 70-90 ℃ in water bath, refluxing for 3-4 hours, cooling to room temperature,
Standing, filtering and cleaning the mixed acid carbon nanotube solution for multiple times, and then filtering, filtering and drying to constant weight. Wherein the mixed acid is concentrated nitric acid: concentrated sulfuric acid is mixed according to the volume ratio of 1: 3, and the components are prepared according to the proportion.
adding a surfactant into the modified carbon nano tube, adding water, and performing ultrasonic treatment, wherein the ultrasonic treatment time is 20-30min, and the ultrasonic power is 600-700W.
Mixing the high belite sulphoaluminate cement with the prepared carbon nano tube suspension and standard sand, stirring by using a cement mortar stirrer in a stirring way of stirring for 60-90s, standing for 15s, then stirring for 60-90s, finally adding into a mould, and vibrating on a vibrating table to discharge air holes until the air holes are compacted to obtain the carbon nano tube modified chlorine ion permeation resistant high belite sulphoaluminate cement-based composite material.
the mass fraction of the concentrated nitric acid is 68 percent.
The mass fraction of the concentrated sulfuric acid is 98.3%.
The surfactant is a water reducing agent, and can be one of sodium lignosulfonate, a polycarboxylic acid water reducing agent or a naphthalene water reducing agent.
the strength grade of the high belite sulphoaluminate cement is more than 42.5. Wherein the mass percent of the belite is more than 36%.
The carbon nanotube has a length of 10-30 μm and a diameter of 20-30 nm.
The gain effect is as follows:
The cement used is high belite sulphoaluminate cement, and has the advantages of high early strength, small heat release and the like compared with portland cement. The carbon nano tube is subjected to acidification treatment, surface modification is carried out on the carbon nano tube, carboxyl and hydroxyl are grafted on the surface, and the agglomeration degree of the carbon nano tube is reduced. The water reducing agent is used for increasing the workability of cement and dispersing the carbon nano tubes, so that the performance of the carbon nano tubes can be exerted more easily.
the carbon nano tube is added into the high belite sulphoaluminate cement, so that the strength of the sulphoaluminate cement can be improved, the porosity of the sulphoaluminate cement is reduced, and the resistance to chloride ion corrosion of the sulphoaluminate cement is improved to a certain extent.
The method for improving the chloride ion permeability resistance of the cement-based material has the advantages of simple preparation, low cost and good impermeability, meets a plurality of engineering requirements, and can be popularized.
Detailed Description
the present invention will be described in further detail with reference to specific examples.
Example 1
A method for improving the chloride ion penetration resistance of a cement-based material is characterized by comprising the following steps:
The method for improving the chloride ion penetration resistance of the cement-based material comprises the following components in parts:
0.1 part by mass of modified carbon nano tubes, 400 parts by mass of high belite sulphoaluminate cement, 200 parts by mass of water, 1200 parts by mass of standard sand and 0.2 part by mass of sodium lignosulfonate.
The preparation method of the modified carbon nano tube comprises the following steps: placing the carbon nano tube in mixed acid, heating the carbon nano tube to 70 ℃ in water bath, refluxing for 3 hours, cooling to room temperature,
Standing, filtering and cleaning the mixed acid carbon nanotube solution for multiple times, and then filtering, filtering and drying to constant weight. Wherein the mixed acid is concentrated nitric acid: concentrated sulfuric acid is mixed according to the volume ratio of 1: 3, and the components are prepared according to the proportion.
Adding a surfactant into the modified carbon nano tube, adding water, and performing ultrasonic treatment, wherein the ultrasonic treatment time is 20min, and the ultrasonic power is 600W.
Mixing the high belite sulphoaluminate cement with the prepared carbon nano tube suspension and standard sand, stirring by using a cement mortar stirrer in a stirring way of stirring for 60s, standing for 15s, then stirring for 60s, finally adding into a mould, and vibrating on a vibrating table to discharge air holes until the air holes are compact to obtain the carbon nano tube modified chlorine ion permeation resistant high belite sulphoaluminate cement-based composite material.
According to the national standard, the RCM method is used for measuring the diffusion coefficient of chloride ions, the diffusion coefficient of the chloride ions of the high belite sulphoaluminate cement-based material without the carbon nano tubes is 5.35 multiplied by 10 -12 m 2/s, the diffusion coefficient of the chloride ions of the prepared modified cement-based material is 4.65 multiplied by 10 -12 m 2/s, and the chloride ion penetration resistance is improved by 13%.
Example 2
a method for improving the chloride ion penetration resistance of a cement-based material is characterized by mainly comprising the following steps:
The method for improving the chloride ion penetration resistance of the cement-based material comprises the following components in parts:
0.3 part by mass of modified carbon nano tubes, 450 parts by mass of high belite sulphoaluminate cement, 220 parts by mass of water, 1300 parts by mass of standard sand and 0.3 part by mass of polycarboxylic acid water reducing agent.
The preparation method of the modified carbon nano tube comprises the following steps: placing the carbon nano tube in mixed acid, heating the carbon nano tube to 80 ℃ in water bath, refluxing for 3.5 hours, cooling to room temperature,
Standing, filtering and cleaning the mixed acid carbon nanotube solution for multiple times, and then filtering, filtering and drying to constant weight. Wherein the mixed acid is concentrated nitric acid: concentrated sulfuric acid is mixed according to the volume ratio of 1: 3, and the components are prepared according to the proportion.
Adding a surfactant into the modified carbon nano tube, adding water, and performing ultrasonic treatment, wherein the ultrasonic treatment time is 25min, and the ultrasonic power is 650W.
Mixing the high belite sulphoaluminate cement with the prepared carbon nano tube suspension and standard sand, stirring by using a cement mortar stirrer in a way of stirring for 70s, standing for 15s, then stirring for 70s, finally adding into a mould, and vibrating on a vibrating table to discharge air holes until the air holes are compact to obtain the carbon nano tube modified chlorine ion permeation resistant high belite sulphoaluminate cement-based composite material.
According to the national standard, the RCM method is used for measuring the diffusion coefficient of chloride ions, the diffusion coefficient of the chloride ions of the high belite sulphoaluminate cement-based material without the carbon nano tubes is 5.35 multiplied by 10 -12 m 2/s, the diffusion coefficient of the chloride ions of the prepared modified cement-based material is 4.61 multiplied by 10 -12 m 2/s, and the chloride ion penetration resistance is improved by 14 percent.
Example 3
A method for improving the chloride ion penetration resistance of a cement-based material is characterized by mainly comprising the following steps:
The method for improving the chloride ion penetration resistance of the cement-based material comprises the following components in parts:
0.5 part by mass of modified carbon nano tubes, 500 parts by mass of high belite sulphoaluminate cement, 250 parts by mass of water, 1400 parts by mass of standard sand and 0.4 part by mass of a naphthalene water reducing agent.
The preparation method of the modified carbon nano tube comprises the following steps: placing the carbon nano tube in mixed acid, heating to 90 ℃ in water bath, refluxing for 4 hours, cooling to room temperature,
Standing, filtering and cleaning the mixed acid carbon nanotube solution for multiple times, and then filtering, filtering and drying to constant weight. Wherein the mixed acid is concentrated nitric acid: concentrated sulfuric acid is mixed according to the volume ratio of 1: 3, and the components are prepared according to the proportion.
Adding a surfactant into the modified carbon nano tube, adding water, and carrying out ultrasonic treatment, wherein the ultrasonic treatment time is 30min, and the ultrasonic power is 700W.
mixing the high belite sulphoaluminate cement with the prepared carbon nano tube suspension and standard sand, stirring by using a cement mortar stirrer in a way of stirring for 90s, standing for 15s, then stirring for 90s, finally adding into a mould, and vibrating on a vibrating table to discharge air holes until the air holes are compact to obtain the carbon nano tube modified chlorine ion permeation resistant high belite sulphoaluminate cement-based composite material.
According to the national standard, the RCM method is used for measuring the diffusion coefficient of chloride ions, the diffusion coefficient of the chloride ions of the high belite sulphoaluminate cement-based material without the carbon nano tubes is 5.35 multiplied by 10 -12 m 2/s, the diffusion coefficient of the chloride ions of the prepared modified cement-based material is 4.81 multiplied by 10 -12 m 2/s, and the chloride ion penetration resistance is improved by 10 percent.
Claims (4)
1. a method for improving the chloride ion penetration resistance of a cement-based material is characterized by comprising the following steps:
The parts of each component required are as follows:
0.1-0.5 part of modified carbon nano tube, 500 parts of high belite sulphoaluminate cement 400-;
the preparation method of the modified carbon nano tube comprises the following steps: placing the carbon nano tube in mixed acid, heating the carbon nano tube to 70-90 ℃ in a water bath, refluxing for 3-4 hours, and then cooling to room temperature; standing, filtering and cleaning the mixed acid carbon nanotube solution for multiple times, and then performing suction filtration and drying to constant weight; wherein the mixed acid is concentrated nitric acid: concentrated sulfuric acid is mixed according to the volume ratio of 1: 3, preparing the components in proportion; the mass fraction of the concentrated nitric acid is 68 percent; the mass fraction of the concentrated sulfuric acid is 98.3 percent;
adding a surfactant into the modified carbon nano tube, adding water, and performing ultrasonic treatment, wherein the ultrasonic treatment time is 20-30min, and the ultrasonic power is 600-700W;
Mixing the high belite sulphoaluminate cement with the prepared carbon nano tube suspension and standard sand, stirring by using a cement mortar stirrer in a stirring way of stirring for 60-90s, standing for 15s, then stirring for 60-90s, finally adding a mould, vibrating on a vibrating table to discharge air holes until the air holes are compact, and obtaining the carbon nano tube modified chlorine ion permeation resistant high belite sulphoaluminate cement-based composite material.
2. The method of claim 1, wherein: the surfactant is water reducing agent, and can be one of sodium lignosulfonate, polycarboxylic acid water reducing agent or naphthalene water reducing agent.
3. The method of claim 1, wherein: the strength grade of the high belite sulphoaluminate cement is more than 42.5; wherein the mass percent of the belite is more than 36%.
4. the method of claim 1, wherein: the carbon nanotube has a length of 10-30 μm and a diameter of 20-30 nm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111995309A (en) * | 2020-08-31 | 2020-11-27 | 武汉大学 | Geopolymer for marine concrete outer protective layer and preparation method thereof |
| CN112194435A (en) * | 2020-10-13 | 2021-01-08 | 盐城工学院 | High-temperature-resistant cement-based composite material and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112194435A (en) * | 2020-10-13 | 2021-01-08 | 盐城工学院 | High-temperature-resistant cement-based composite material and preparation method thereof |
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