CN110395951A - A kind of graphene concrete composite material of chloride-penetration resistance and preparation method thereof - Google Patents
A kind of graphene concrete composite material of chloride-penetration resistance and preparation method thereof Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 102
- 239000004567 concrete Substances 0.000 title claims abstract description 53
- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 138
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 91
- 239000000243 solution Substances 0.000 claims abstract description 72
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000004568 cement Substances 0.000 claims abstract description 37
- 239000004576 sand Substances 0.000 claims abstract description 28
- 239000010881 fly ash Substances 0.000 claims abstract description 23
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 20
- 239000010439 graphite Substances 0.000 claims abstract description 20
- 239000011259 mixed solution Substances 0.000 claims abstract description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 31
- 239000012615 aggregate Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 17
- 239000002253 acid Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000010410 layer Substances 0.000 claims description 4
- 238000010907 mechanical stirring Methods 0.000 claims description 4
- 238000009210 therapy by ultrasound Methods 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000002356 single layer Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 7
- 230000035515 penetration Effects 0.000 abstract description 3
- 235000019441 ethanol Nutrition 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 15
- 125000004432 carbon atom Chemical group C* 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 150000001721 carbon Chemical group 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/184—Preparation
- C01B32/19—Preparation by exfoliation
-
- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2204/00—Structure or properties of graphene
- C01B2204/20—Graphene characterized by its properties
- C01B2204/32—Size or surface area
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- Nanotechnology (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to graphene concrete composite materials of a kind of chloride-penetration resistance and preparation method thereof.The graphene concrete composite material of the chloride-penetration resistance is made of the component of following mass parts: cement, and 6-20 parts；Flyash, 1-10 parts；Sand, 12-33 parts；Aggregate, 25-50 parts；Solution containing graphene and water-reducing agent, 3-8 parts, the summation of said components is 100 parts.Solution wherein containing graphene and water-reducing agent is obtained by sonicated in the mixed solution of graphite water of the addition containing water-reducing agent and ethyl alcohol, and wherein mass percent shared by graphene is 0.5%-10%.Studies have shown that the mechanical property of the graphene concrete composite material of chloride-penetration resistance prepared by the present invention, Anti-Chloride Ion Penetration are obviously improved, the cement concrete material for developing high-performance and multifunction is of great significance.
Description
Technical Field
The invention relates to a concrete composite material, in particular to a graphene concrete composite material resistant to chloride ion permeation and a preparation method thereof.
Background
The cement concrete is the cheapest and most widely applied building material in the current building construction. However, as high-rise and super high-rise buildings are built and projects such as cross-sea, cross-river bridges and submarine tunnels are built, more and more problems such as low tensile strength, poor toughness, poor permeability and the like are exposed to the traditional concrete materials. If the defects of the concrete cannot be comprehensively known and properly solved, the application of the concrete in various fields is restricted.
Among the environmental factors affecting the durability of concrete structures, the most common and serious cause is corrosion caused by chloride attack. In the east coastal and west saline-alkali areas of China, the maintenance cost is increased year by year due to the concrete damage caused by chloride ion corrosion, and huge economic loss is caused. In northern areas of China, the chloride ion deicing salt industry frequently used in winter to ensure smooth traffic causes serious damage to pavements and bridge decks. The research shows that the compactness of concrete can be improved by adding some nano materials, so that the permeability of chloride ions is reduced, and the durability is improved.
The graphene is a two-dimensional honeycomb hexagonal structure formed by tightly packing carbon atoms, each carbon atom is hybridized by SP2, the connection flexibility between the carbon atoms is good, when an external force is applied, the carbon atom plane is deformed and bent, but the positions of the carbon atoms cannot be rearranged, so that the structural stability of the graphene is maintained. Due to the crystal lattice of the graphene, the graphene has good properties of flexibility, adhesion and the like. Each carbon atom in graphene forms a covalent bond with 3 other adjacent carbon atoms, the remaining 1 p orbital electron forms a pi bond, and pi electrons can move freely, so that the graphene is a typical two-dimensional material. The graphene has excellent mechanical, electrical and thermal properties, so that the graphene becomes an important material for enhancing the performance of cement concrete. By virtue of the volume effect, the surface effect and the filling effect of the graphene in a cement matrix, the graphene shows good application prospects in the aspects of improving the tensile strength, toughness, permeability, durability and the like of the cement-based material.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a graphene concrete composite material with chlorine ion permeation resistance and a preparation method thereof. Due to the existence of the graphene, the cement concrete can form a more regular and compact structure after hydration, so that the permeability of chloride ions, water and the like is reduced, and the mechanical properties such as tensile strength, toughness, hardness and the like are improved.
In order to achieve the above object, the technical solution of the present invention is:
the graphene concrete composite material resisting chloride ion permeation is composed of the following components in parts by mass: 6-20 parts of cement; 1-10 parts of fly ash; 12-33 parts of sand; 25-50 parts of aggregate; 3-8 parts of a solution containing graphene and a water reducing agent.
Wherein,
the graphene is a mixture of single-layer graphene, few-layer graphene and multi-layer graphene, the mass of the graphene is 0.5% -10% of the total mass of a solution containing the graphene and a water reducing agent, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the relative solid content is 30-40%, the water reducing rate is not less than 15%, the mass ratio of the water reducing agent to the graphene is 10:1-3:1, a solvent used in the solution is a mixed solution of water and 95% ethanol, and the volume ratio of the water to the 95% ethanol is 2:1-1: 1. The cement is ordinary portland cement, the sand is medium sand, the aggregate is continuous graded broken stone, and the grain size is not more than 20 mm. The preparation method of the solution containing graphene and the water reducing agent comprises the following steps:
1) measuring a certain volume of water and 95% ethanol, and weighing a certain mass of water reducing agent and expanded graphite;
2) mixing the raw materials in the step 1), and uniformly mixing by adopting a mechanical stirring method;
3) placing the mixture obtained in the step 2) in a water bath for ultrasonic treatment for 0.5-4 h to obtain the solution containing graphene and the water reducing agent.
The preparation method of the graphene concrete composite material capable of resisting chloride ion permeation comprises the following steps:
1) weighing cement, fly ash, sand, aggregate and a solution containing graphene and a water reducing agent according to the mass fraction of the formula;
2) adding the solution containing graphene and a water reducing agent into cement, and stirring for 1-5 minutes;
3) adding fly ash, sand and aggregate into the mixture obtained in the step 2), and stirring for 2 minutes to obtain the graphene concrete composite material resistant to chloride ion permeation.
The technical scheme of the invention has the advantages that:
(1) the mixed solution of water and ethanol has strong dissolving power and larger polarity, and meanwhile, the materials are easy to obtain and are environment-friendly. In the process of preparing the graphene by using a liquid phase stripping method, the graphene is dispersed in a mixed solution of water and ethanol in situ, the graphene is dispersed more uniformly, a subsequent dispersing process is omitted, the uniformity of the graphene dispersed in cement concrete is ensured, and the utilization rate of the graphene is improved.
(2) The graphene serving as a nano material can fill the pore diameter in cement, optimize the pore structure of the cement, influence the hydration process of the cement, and form the cement with a more regular compact structure under the joint influence of the two actions, so that the chloride ion permeability resistance of the cement-based concrete is improved.
(3) The graphene has the microcosmic appearance characteristics of concave-convex folds and saw-toothed shapes, the specific surface area reaches 1200m2/g after the graphene is compounded, the contact and effective adhesion between the graphene and concrete materials such as sand, aggregate and the like are enhanced, and therefore the tensile strength and the toughness of the concrete are improved.
(4) The preparation method has the advantages of simple preparation process, mild conditions, environmental protection and low cost.
Detailed Description
The present invention will be further understood with reference to the following specific examples, which are not intended to limit the invention.
Example 1
The graphene concrete composite material resistant to chloride ion permeation in the embodiment is composed of the following components in parts by mass: 13 parts of cement; 2.1 parts of fly ash; 19.5 parts of sand; 36.2 parts of aggregate; 4.2 parts of a solution containing graphene and a water reducing agent.
The solution containing graphene and a water reducing agent comprises the following raw materials: the water-based high-efficiency water reducing agent comprises water, 95% ethanol, expanded graphite and a polycarboxylic acid high-efficiency water reducing agent, wherein the volume ratio of the water to the ethanol is 1:1, the expanded graphite accounts for 2% of the total mass of the solution, the water reducing agent accounts for 10% of the total mass of the solution, and the preparation process comprises the following steps:
1) weighing water and 95% ethanol according to the formula volume, and weighing the water reducing agent and the expanded graphite according to the formula mass;
2) mixing the raw materials in the step 1), and uniformly mixing by adopting a mechanical stirring method;
3) and (3) placing the mixture obtained in the step 2) in a water bath for ultrasonic treatment for 2h to obtain the solution containing the graphene and the water reducing agent.
The preparation process of the graphene concrete composite material resisting chloride ion permeation comprises the following steps:
1) weighing cement, fly ash, sand, aggregate and a solution containing graphene and a water reducing agent according to the mass fraction of the formula;
2) adding the solution containing graphene and a water reducing agent into cement, and stirring for 4 minutes;
3) adding fly ash, sand and aggregate into the mixture obtained in the step 2), and stirring for 2 minutes to obtain the graphene concrete composite material resistant to chloride ion permeation.
Example 2
The graphene concrete composite material resistant to chloride ion permeation in the embodiment is composed of the following components in parts by mass: 13 parts of cement; 2.1 parts of fly ash; 19.5 parts of sand; 36.2 parts of aggregate; 4.2 parts of a solution containing graphene and a water reducing agent.
The solution containing graphene and a water reducing agent comprises the following raw materials: the water-based high-efficiency water reducing agent comprises water, 95% of ethanol, expanded graphite and a polycarboxylic acid high-efficiency water reducing agent, wherein the volume ratio of the water to the ethanol is 1.5:1, the expanded graphite accounts for 2% of the total mass of the solution, and the water reducing agent accounts for 10% of the total mass of the solution.
The procedure was as in example 1.
Example 3
The graphene concrete composite material resistant to chloride ion permeation in the embodiment is composed of the following components in parts by mass: 13 parts of cement; 2.1 parts of fly ash; 19.5 parts of sand; 36.2 parts of aggregate; 4.2 parts of a solution containing graphene and a water reducing agent.
The solution containing graphene and a water reducing agent comprises the following raw materials: the water-based high-efficiency water reducing agent comprises water, 95% of ethanol, expanded graphite and a polycarboxylic acid high-efficiency water reducing agent, wherein the volume ratio of the water to the ethanol is 2:1, the expanded graphite accounts for 2% of the total mass of the solution, and the water reducing agent accounts for 10% of the total mass of the solution.
The procedure was as in example 1.
Example 4
The graphene concrete composite material resistant to chloride ion permeation in the embodiment is composed of the following components in parts by mass: 13 parts of cement; 2.1 parts of fly ash; 19.5 parts of sand; 36.2 parts of aggregate; 4.2 parts of a solution containing graphene and a water reducing agent.
The solution containing graphene and a water reducing agent comprises the following raw materials: the water-based high-efficiency water reducing agent comprises water, 95% of ethanol, expanded graphite and a polycarboxylic acid high-efficiency water reducing agent, wherein the volume ratio of the water to the ethanol is 2:1, the expanded graphite accounts for 1% of the total mass of the solution, and the water reducing agent accounts for 10% of the total mass of the solution.
The procedure was as in example 1.
Example 5
The graphene concrete composite material resistant to chloride ion permeation in the embodiment is composed of the following components in parts by mass: 13 parts of cement; 2.1 parts of fly ash; 19.5 parts of sand; 36.2 parts of aggregate; 4.2 parts of a solution containing graphene and a water reducing agent.
The solution containing graphene and a water reducing agent comprises the following raw materials: the water-based high-efficiency water reducing agent comprises water, 95% of ethanol, expanded graphite and a polycarboxylic acid high-efficiency water reducing agent, wherein the volume ratio of the water to the ethanol is 2:1, the expanded graphite accounts for 0.75% of the total mass of the solution, and the water reducing agent accounts for 7.5% of the total mass of the solution.
The procedure was as in example 1.
Example 6
The graphene concrete composite material resistant to chloride ion permeation in the embodiment is composed of the following components in parts by mass: 13 parts of cement; 2.1 parts of fly ash; 19.5 parts of sand; 36.2 parts of aggregate; 4.2 parts of a solution containing graphene and a water reducing agent.
The solution containing graphene and a water reducing agent comprises the following raw materials: the water-based high-efficiency water reducing agent comprises water, 95% of ethanol, expanded graphite and a polycarboxylic acid high-efficiency water reducing agent, wherein the volume ratio of the water to the ethanol is 2:1, the expanded graphite accounts for 0.5% of the total mass of the solution, and the water reducing agent accounts for 5% of the total mass of the solution.
The procedure was as in example 1.
Example 7
The graphene concrete composite material resistant to chloride ion permeation in the embodiment is composed of the following components in parts by mass: 13 parts of cement; 2.1 parts of fly ash; 19.5 parts of sand; 36.2 parts of aggregate; 5.2 parts of solution containing graphene and a water reducing agent.
The solution containing graphene and a water reducing agent comprises the following raw materials: the water-based high-efficiency water reducing agent comprises water, 95% of ethanol, expanded graphite and a polycarboxylic acid high-efficiency water reducing agent, wherein the volume ratio of the water to the ethanol is 2:1, the expanded graphite accounts for 0.5% of the total mass of the solution, and the water reducing agent accounts for 5% of the total mass of the solution.
The procedure was as in example 1.
Example 8
The graphene concrete composite material resistant to chloride ion permeation in the embodiment is composed of the following components in parts by mass: 13 parts of cement; 2.1 parts of fly ash; 19.5 parts of sand; 36.2 parts of aggregate; 6.2 parts of a solution containing graphene and a water reducing agent.
The solution containing graphene and a water reducing agent comprises the following raw materials: the water-based high-efficiency water reducing agent comprises water, 95% of ethanol, expanded graphite and a polycarboxylic acid high-efficiency water reducing agent, wherein the volume ratio of the water to the ethanol is 2:1, the expanded graphite accounts for 0.5% of the total mass of the solution, and the water reducing agent accounts for 5% of the total mass of the solution.
The procedure was as in example 1.
Comparative example 1
The concrete composite material of the comparative example is composed of the following components in parts by mass: 13 parts of cement; 2.1 parts of fly ash; 19.5 parts of sand; 36.2 parts of aggregate; 4.2 parts of a solution containing a water reducing agent.
The solution containing the water reducing agent comprises the following raw materials: water, 95% ethanol and a polycarboxylic acid high-efficiency water reducing agent, wherein the volume ratio of the water to the ethanol is 1:1, the water reducing agent accounts for 10% of the total mass of the solution, and the preparation process comprises the following steps:
1) weighing water and 95% ethanol according to the formula volume, and weighing the water reducing agent according to the formula mass;
2) mixing the raw materials in the step 1), and uniformly mixing by adopting a mechanical stirring method;
3) and (3) placing the mixture obtained in the step 2) in a water bath for ultrasonic treatment for 2h to obtain a solution containing the water reducing agent.
The preparation process of the concrete composite material comprises the following steps:
1) weighing cement, fly ash, sand, aggregate and a solution containing a water reducing agent according to the mass fraction of the formula;
2) adding the solution containing the water reducing agent into cement, and stirring for 4 minutes;
3) adding the fly ash, the sand and the aggregate into the mixture obtained in the step 2), and stirring for 2 minutes to obtain the concrete composite material.
Comparative example 2
The concrete composite material of the comparative example is composed of the following components in parts by mass: 13 parts of cement; 2.1 parts of fly ash; 19.5 parts of sand; 36.2 parts of aggregate; 4.2 parts of a solution containing a water reducing agent.
The solution containing the water reducing agent comprises the following raw materials: water, 95% ethanol and a polycarboxylic acid high-efficiency water reducing agent, wherein the volume ratio of the water to the ethanol is 1:1, and the water reducing agent accounts for 7.5% of the total mass of the solution.
The procedure was the same as in comparative example 1.
Comparative example 3
The concrete composite material of the comparative example is composed of the following components in parts by mass: 13 parts of cement; 2.1 parts of fly ash; 19.5 parts of sand; 36.2 parts of aggregate; 4.2 parts of a solution containing a water reducing agent.
The solution containing the water reducing agent comprises the following raw materials: water, 95% ethanol and a polycarboxylic acid high-efficiency water reducing agent, wherein the volume ratio of the water to the ethanol is 1:1, and the water reducing agent accounts for 5% of the total mass of the solution.
The procedure was the same as in comparative example 1.
Comparative example 4
The concrete composite material of the comparative example is composed of the following components in parts by mass: 13 parts of cement; 2.1 parts of fly ash; 19.5 parts of sand; 36.2 parts of aggregate; 6.2 parts of a solution containing a water reducing agent.
The solution containing the water reducing agent comprises the following raw materials: water, 95% ethanol and a polycarboxylic acid high-efficiency water reducing agent, wherein the volume ratio of the water to the ethanol is 1:1, and the water reducing agent accounts for 5% of the total mass of the solution.
The procedure was the same as in comparative example 1.
The concrete composite materials of the examples and the comparative examples are respectively cured to a specified age and then tested for mechanical property and chloride ion penetration resistance, the mechanical property of the concrete is tested according to GB/T50081-2002 test method standard for mechanical property of common concrete, the chloride ion penetration resistance of the concrete is tested by an RCM method according to GB/T50082-2009 test method standard for long-term property and durability of common concrete, and the test results are shown in the following table.
Detecting items
As can be seen from the performance test results, the concrete composite performance of the example sample containing graphene was overall superior to that of the comparative example not containing graphene. In the test investigation range of the examples and the comparative examples, compared with the comparative examples, the chloride ion diffusion coefficient of the example containing graphene can be improved by 15-34% in 28 days, the compressive strength of the example containing graphene is improved by 9-25% in 3 days, the compressive strength of the example containing graphene is improved by 12-15% in 28 days, the flexural strength of the example containing graphene is improved by 20-51% in 3 days, and the flexural strength of the example containing graphene is improved by 3-28% in 28 days.
The applicant declares that any modifications to the invention, equivalent replacements of raw materials and additions of auxiliary components to the product of the invention, the selection of specific modes, etc., fall within the protection scope and disclosure scope of the invention.
Claims (10)
1. The graphene concrete composite material resistant to chloride ion permeation is characterized by comprising the following components in parts by mass: 6-20 parts of cement; 1-10 parts of fly ash; 12-33 parts of sand; 25-50 parts of aggregate; 3-8 parts of a solution containing graphene and a water reducing agent.
2. The solution containing graphene and a water reducing agent according to claim 1, characterized in that: the graphene is a mixture of single-layer graphene, few-layer graphene and multi-layer graphene.
3. The solution containing graphene and a water reducing agent according to claim 1, characterized in that: the graphene accounts for 0.5-10% of the total mass of the solution.
4. The solution containing graphene and a water reducing agent according to claim 1, characterized in that: the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the relative solid content is 30-40%, the water reducing rate is not less than 15%, and the mass ratio of the water reducing agent to the graphene is 10:1-3: 1.
5. The solution containing graphene and a water reducing agent according to claim 1, characterized in that: the solvent used in the solution is a mixed solution of water and 95% ethanol, and the volume ratio of the water to the 95% ethanol is 2:1-1: 1.
6. The solution containing graphene and a water reducing agent according to claim 1, characterized in that: the preparation method of the solution containing graphene and the water reducing agent comprises the following steps:
1) measuring a certain volume of water and 95% ethanol, and weighing a certain mass of water reducing agent and expanded graphite;
2) mixing the raw materials in the step 1), and uniformly mixing by adopting a mechanical stirring method;
3) placing the mixture obtained in the step 2) in a water bath for ultrasonic treatment for 0.5-4 h to obtain the solution containing graphene and the water reducing agent.
7. The graphene concrete composite material resisting chloride ion permeation and the preparation method thereof according to claim 1 are characterized in that: the cement is ordinary portland cement.
8. The graphene concrete composite material resisting chloride ion permeation and the preparation method thereof according to claim 1 are characterized in that: the sand is medium sand.
9. The graphene concrete composite material resisting chloride ion permeation and the preparation method thereof according to claim 1 are characterized in that: the aggregate is continuous graded broken stone with the grain diameter not larger than 20 mm.
10. The graphene concrete composite material resisting chloride ion permeation and the preparation method thereof according to claim 1 are characterized in that: the preparation method comprises the following steps:
1) weighing cement, fly ash, sand, aggregate and a solution containing graphene and a water reducing agent according to the mass fraction of the formula;
2) adding the solution containing graphene and a water reducing agent into cement, and stirring for 1-5 minutes;
3) adding fly ash, sand and aggregate into the mixture obtained in the step 2), and stirring for 2 minutes to obtain the graphene concrete composite material resistant to chloride ion permeation.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN115353334B (en) * | 2022-08-20 | 2023-10-03 | 温州华邦混凝土有限公司 | Environment-friendly concrete resistant to chloride ion permeation and preparation method thereof |
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