CN113480261B - GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete and preparation method thereof - Google Patents
GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete and preparation method thereof Download PDFInfo
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- CN113480261B CN113480261B CN202110838324.2A CN202110838324A CN113480261B CN 113480261 B CN113480261 B CN 113480261B CN 202110838324 A CN202110838324 A CN 202110838324A CN 113480261 B CN113480261 B CN 113480261B
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
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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
- 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
- C04B2111/24—Sea water resistance
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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
- 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
- C04B2111/26—Corrosion of reinforcement resistance
Abstract
The invention belongs to the field of concrete preparation, and particularly relates to GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete and a preparation method thereof. According to the invention, GO-Ag nanofluid is adopted, so that the surface roughness of GO is increased, the agglomeration of composite nanoparticles is reduced, graphene oxide is well bonded with a material for forming concrete, the mechanical property of the concrete is improved, the penetration of chloride ions can be effectively prevented in a seawater environment through silver ions, the corrosion of reinforcing steel bars is prevented, and the durability and the chloride ion corrosion resistance of the concrete are improved.
Description
Technical Field
The invention belongs to the field of concrete preparation, and particularly relates to GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete and a preparation method thereof.
Background
Due to the porous structure of the concrete, microcracks are easily generated in the concrete, and the microcracks can be continuously expanded under the long-term action of external force or external environment, so that a concrete member or a building is broken and damaged, and the service life of the concrete building is shortened. In recent years, carbon nanomaterials are developed rapidly and widely applied, wherein Graphene Oxide (GO) has good hydrophilic performance, can control the generation and the expansion of concrete cracks in a nanoscale, improve the compactness of concrete and can be used as a nucleation site of a hydration product to accelerate hydration. However, graphene oxide is a smooth film structure, has low surface roughness, has poor adhesion with a concrete material, and is easily debonded and peeled from a concrete matrix in a stress process, so that the surface roughness of the composite material is improved by compounding the graphene oxide with other nano materials, and the key for improving the concrete performance by the graphene oxide is to increase the bonding strength of the graphene oxide and the concrete matrix.
In addition, the use of marine concrete in ocean engineering is increasing at present, but some ions in the seawater can influence the service life of marine concrete, for example, chloride ions can permeate to the surface of reinforcing steel bars to corrode the reinforcing steel bars, and the problem is also urgently needed to be solved.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete and a preparation method thereof.
On one hand, the invention provides GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete which comprises the following components in parts by weight:
portland cement: 450 portion and 650 portions, water: 280-360 parts of aggregate: 1400-1600 parts of mineral admixture: 20-30 parts of a water reducing agent: 4-8 parts of GO-Ag nanofluid, and 120 parts of GO-Ag nanofluid.
The invention further improves the following steps: the aggregate gradation of the water aggregate is as follows according to the parts by weight: 15-25 parts of 0.075-0.15mm aggregate, 65-85 parts of 1.18-2.36mm aggregate and 150-170 parts of 9.5-16mm aggregate. The concentration of coagulation is adjusted by aggregate gradation. And the aggregate is used as a filling material, so that the cement paste has higher volume stability and better durability.
The invention further improves the method, and the mineral admixture comprises the following components in parts by weight: 50 parts of fly ash and 50 parts of slag. Ordinary portland cement is a common building material, has wide application and low cost, and is a preferred material for producing plates. The mineral admixture replaces part of cement, can reduce hydration heat, has certain activity and improves the performance of concrete.
The invention is further improved in that the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 16-18%. The water reducing agent can destroy the flocculation structure of cement particles, play a role in dispersing the cement particles and improve the fluidity of concrete mixtures.
In a further refinement of the present invention, the nanofluid is 0.5 wt.% GO-Ag nanofluid.
The invention further improves that the load capacity of Ag in GO-Ag is 20-30%, namely, 20-30 mol of Ag is loaded per 100mol of graphene oxide.
The invention further improves that the preparation of GO-Ag nanofluid comprises the following steps: (1) mixing KMnO 4 Slowly adding into graphite powder and NaNO 3 And concentrated H 2 SO 4 Stirring the reaction solution for a period of time, adding deionized water, stirring the reaction solution, and adding deionized water and H 2 O 2 Washing with acid and water, and then carrying out ultrasonic treatment and drying to obtain flaky GO; grinding the flaky GO prepared in the step (1) into powder, and adding the powder into water to prepare GO/water nanofluid with different mass fractions; (3) and (3) mixing the GO/water nanofluid prepared in the step (2) with a silver nitrate solution according to a certain volume ratio, reacting the mixed solution in a reaction kettle, washing with acid and water after a period of time, drying to obtain composite nanoparticles, adding the composite nanoparticles into water, and performing ultrasonic vibration to obtain the GO-Ag nanofluid.
Preferably, the preparation of GO-Ag nanofluid comprises the following steps: mixing 9g KMnO 4 Adding 3g of graphite powder and 1.5g of NaNO at low temperature 3 And 69mL of concentrated H 2 SO 4 Stirring the mixed solution for 30min, adding 138mL of deionized water after the reaction solution is stirred for 1H at 35 ℃, stirring the reaction solution for 20min at 85 ℃, and adding 420mL of deionized water and 3mL of H 2 O 2 The method comprises the steps of carrying out ultrasonic treatment and drying after pickling and washing to obtain flaky GO, grinding the flaky GO into powder, adding the powder into water to prepare GO/water nanofluid with the mass fraction of 0.25 wt.%, mixing the GO/water nanofluid with a silver nitrate solution according to the volume ratio of 1:4, reacting the mixed solution in a reaction kettle at 160 ℃ for 12 hours, carrying out pickling and washing and drying to obtain composite nanoparticles, adding the composite nanoparticles into water, and carrying out ultrasonic vibration to obtain 0.5 wt.% GO-Ag nanofluid.
On the other hand, the invention provides a preparation method of GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete, which comprises the following steps:
(1) weighing the following raw materials according to a formula: cement, water, aggregate, mineral admixture and water reducing agent are stirred uniformly.
(2) And (3) pouring 0.5 wt.% of GO-Ag nanofluid into the mixture obtained in the step (1), and continuously stirring until the mixture is uniform.
(3) And (3) putting the mixture obtained in the step (2) into a mold, curing and molding.
The invention further improves the following steps: and 2, stirring for 3-5 min.
The invention has the beneficial effects that:
(1) according to the invention, two-dimensional graphene oxide and nano-silver particles are compounded, so that the surface roughness of the graphene oxide and the adhesion of the graphene oxide and a marine concrete matrix are improved.
(2) According to the invention, the prepared graphene oxide is compounded with the nano silver particles, so that the penetration of chloride ions can be effectively prevented, the corrosion of reinforcing steel bars can be prevented, and the durability and the chloride ion corrosion resistance of concrete can be improved.
(3) According to the invention, the prepared graphene oxide and nano-silver composite nano-particles are prepared into the nano-fluid, so that the nano-particles can be uniformly dispersed without agglomeration, and the advantage of high surface activity of the nano-material is fully exerted.
(4) The prepared concrete has good curing effect on chloride ions, and the diffusion coefficient of the chloride ions after being soaked in the prepared simulated seawater solution for 90 days is about 0.52 x 10 -12 m 2 /s。
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: preparation of GO-Ag nanofluid
The preparation method comprises adjusting different parameters, and mixing 9g KMnO 4 Adding 3g of graphite powder and 1.5g of NaNO at low temperature 3 And 69mL of concentrated H 2 SO 4 Stirring the mixed solution for 30min, adding 138mL of deionized water after the reaction solution is stirred for 1H at 35 ℃, stirring the reaction solution for 20min at 85 ℃, and adding 420mL of deionized water and 3mL of H 2 O 2 Ultrasonic wave and baking after acid washingDrying to obtain flaky GO, grinding the flaky GO into powder, adding the powder into water to prepare GO/water nanofluid with the mass fraction of 0.25 wt.%, mixing the GO/water nanofluid with a silver nitrate solution according to the volume ratio of 1:4, reacting the mixed solution in a reaction kettle at 160 ℃ for 12 hours, pickling, washing with water, drying to obtain composite nanoparticles, adding the composite nanoparticles into water, and performing ultrasonic vibration to obtain GO-Ag nanofluid with different mass fractions.
Example 2: preparation of GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete
The raw materials are portland cement: 450 parts, water: 280 parts, aggregate: 1400 parts of mineral admixture: 25 parts of water reducing agent: 5 parts of GO-Ag nanofluid 100 parts.
The aggregate gradation of the water aggregate is as follows according to the parts by weight: 20 parts of 0.075-0.15mm aggregate, 70 parts of 1.18-2.36mm aggregate and 150 parts of 9.5-16mm aggregate.
The mineral admixture comprises the following components in parts by weight: 50 parts of fly ash and 50 parts of slag.
The water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 16%.
The mass fractions of the prepared GO-Ag nanofluid are 0.1 wt.%, 0.3 wt.%, 0.5 wt.% and 0.7 wt.%, respectively.
The loading amount of Ag in GO-Ag is 30%, namely 30mol of Ag is loaded in every 100mol of graphene oxide.
The preparation method comprises the following steps:
(1) weighing the following raw materials according to a formula: cement, water, aggregate, mineral admixture and water reducing agent are poured into a planetary mortar mixer to be mixed uniformly.
(2) And (3) pouring GO-Ag nanofluids with different mass fractions into the mixture obtained in the step (1), and continuously stirring the mixture until the mixture is uniform, wherein the stirring time is 3-5 min.
(3) And (3) putting the mixture obtained in the step (2) into a mold for curing and molding.
Example 3: performance testing
All concrete samples were poured at one time. All test pieces were of the same size, and had a cross-sectional size of 240mm × 300mm and a total length of 2400 mm. Two-point symmetrical loading is adopted, and two pressure loading points are positioned at the position of the three-point position of the upper surface. And a tension area at the bottom of the test piece is provided with a main reinforcing steel bar.
The test piece deformation measurement is to arrange vibrating string type displacement sensors at the supports at the two ends of the test piece, the two loading points and the midspan respectively and measure the vertical deformation of the test piece under the action of load.
In the test, an electrochemical corrosion method is adopted to quickly corrode the steel bars of the test piece. Soaking a test piece in a corrosion tank filled with 5% NaCl solution for a certain time, connecting a constant direct-current power supply, connecting a longitudinal steel bar of the test piece with an anode of the direct-current power supply, connecting a cathode of the direct-current power supply with stainless steel in the solution, and sealing the joint of the steel bar and a lead by using epoxy resin to ensure that current only passes through the steel bar; the current intensity and the power-on time are adjusted in the corrosion process to control the corrosion rate of the steel bars of the test piece, and all the test pieces are subjected to electrochemical corrosion for 12 hours.
The time for each test piece to crack (hold at 50KN at the load point) for greater than 1.5mm and the pressure at which the test piece completely cracked were counted and the experimental results are as follows.
According to the data, after the GO-Ag nanofluid is added, the bearing pressure capacity of the concrete sample is increased, the surface roughness of the graphene oxide is increased through the silver particles, and the adhesion between the graphene oxide and the concrete material is enhanced; it can be seen from the observation of the surface of the steel bar after cracking that the corrosion degree of the surface of the steel bar is in negative correlation with the maximum pressure of the sample when the steel bar is completely cracked, so that the corrosion resistance degree of the steel bar can be increased after GO-Ag nanofluid is added, and silver ions can be combined with chloride ions in a seawater environment to generate silver chloride precipitates to resist the corrosion of the chloride ions, thereby achieving the effects of solidifying the chloride ions and preventing the corrosion of the steel bar.
Meanwhile, with the increase of the mass fraction of the GO-Ag nanofluid, the time for cracking of more than 1.5mm is increased, and the pressure for completely cracking the sample is increased, but after the mass fraction of the GO-Ag nanofluid exceeds 0.5 wt.%, the change amplitude is small, so that the mass fraction of the GO-Ag nanofluid is selected to be 0.5 wt.% as the optimal proportion.
In addition, the concrete without adding GO-Ag but with 0.25 wt.% of GO has better performance than the concrete without adding any nano-particles and is inferior to the concrete with GO-Ag nano-particles, and the synergistic effect of the silver nano-particles and the graphene oxide on the concrete matrix is further verified.
Example 4:
the preparation of the GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete comprises the following raw materials in percentage by weight: 500 parts, water: 300 parts of aggregate: 1500 parts, mineral admixture: 25 parts of water reducing agent: 6 parts of GO-Ag nanofluid 110 parts.
The aggregate comprises the following components in parts by weight: 20 parts of 0.075-0.15mm aggregate, 70 parts of 1.18-2.36mm aggregate and 150 parts of 9.5-16mm aggregate.
The mineral admixture comprises the following components in parts by weight: 50 parts of fly ash and 50 parts of slag.
The water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 16%.
The mass fractions of the nano fluids of GO and Ag are respectively 0.5 wt.%.
The loading amount of Ag in GO-Ag is 30%, namely 30mol of Ag is loaded in every 100mol of graphene oxide.
The GO-Ag preparation method is shown in example 1, and the GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete is prepared in example 2.
Example 5:
the preparation of the GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete comprises the following raw materials in percentage by weight: 650 parts, water: 360 parts, aggregate: 1600 parts, mineral admixture: 30 parts of water reducing agent: 8 parts of GO-Ag nanofluid and 120 parts of GO-Ag nanofluid.
The aggregate gradation of the water aggregate is as follows according to the parts by weight: 20 parts of 0.075-0.15mm aggregate, 70 parts of 1.18-2.36mm aggregate and 150 parts of 9.5-16mm aggregate.
The mineral admixture comprises the following components in parts by weight: 50 parts of fly ash and 50 parts of slag.
The water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 16%.
The mass fractions of the nano fluids of GO and Ag are respectively 0.5 wt.%.
The loading amount of Ag in GO-Ag is 30%, namely 30mol of Ag is loaded in every 100mol of graphene oxide.
The GO-Ag preparation method is shown in example 1, and the GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete is prepared in example 2.
Example 6:
the preparation of the GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete comprises the following raw materials in percentage by weight: 450 parts, water: 280 parts, aggregate: 1400 parts of mineral admixture: 20 parts of water reducing agent: 4 parts of GO-Ag nanofluid and 100 parts of GO-Ag nanofluid.
The aggregate gradation of the water aggregate is as follows according to the parts by weight: 20 parts of 0.075-0.15mm aggregate, 70 parts of 1.18-2.36mm aggregate and 150 parts of 9.5-16mm aggregate.
The mineral admixture comprises the following components in parts by weight: 50 parts of fly ash and 50 parts of slag.
The water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 16%.
The mass fractions of the nano fluids of GO and Ag are respectively 0.5 wt.%.
The loading amount of Ag in GO-Ag is 30%, namely 30mol of Ag is loaded in every 100mol of graphene oxide.
The GO-Ag preparation method is shown in example 1, and the GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete is prepared in example 2.
Example 7:
preparing the chlorine ion permeation resistant marine concrete modified by the GO-Ag nanofluid according to the raw material proportion that silicate cement: 450 parts, water: 280 parts, aggregate: 1400 parts of mineral admixture: 25 parts of water reducing agent: 5 parts of GO-Ag nanofluid and 100 parts of GO-Ag nanofluid.
The aggregate gradation of the water aggregate is as follows according to the parts by weight: 15 parts of 0.075-0.15mm aggregate, 65 parts of 1.18-2.36mm aggregate and 150 parts of 9.5-16mm aggregate.
The mineral admixture comprises the following components in parts by weight: 50 parts of fly ash and 50 parts of slag.
The water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 16%.
The nano fluid is GO-Ag nano fluid with mass fraction of 0.5 wt.%.
The loading amount of Ag in GO-Ag is 30%, namely 30mol of Ag is loaded in every 100mol of graphene oxide.
The GO-Ag preparation method is shown in example 1, and the GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete is prepared in example 2.
Example 8:
preparing the chlorine ion permeation resistant marine concrete modified by the GO-Ag nanofluid according to the raw material proportion that silicate cement: 450 parts, water: 280 parts, aggregate: 1400 parts of mineral admixture: 25 parts of water reducing agent: 5 parts of GO-Ag nanofluid and 100 parts of GO-Ag nanofluid.
The aggregate gradation of the water aggregate is as follows according to the parts by weight: 25 parts of 0.075-0.15mm aggregate, 85 parts of 1.18-2.36mm aggregate and 170 parts of 9.5-16mm aggregate.
The mineral admixture comprises the following components in parts by weight: 50 parts of fly ash and 50 parts of slag.
The water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 18%.
The nano fluid is GO-Ag nano fluid with mass fraction of 0.5 wt.%.
The loading amount of Ag in GO-Ag is 30%, namely 30mol of Ag is loaded in every 100mol of graphene oxide.
The GO-Ag preparation method is shown in example 1, and the GO-Ag nanofluid modified chlorine ion permeation-resistant marine concrete is shown in example 2.
Example 9: performance testing
The specific experimental method was the same as in example 3, and the experimental results were as follows.
As can be seen from the above table, the overall performance is relatively stable for different proportions, but the performance is different for different proportions. GO-Ag is to load nano silver particles on the surface of Graphene Oxide (GO), the nano silver particles can effectively increase the surface area and the surface roughness of GO, so that the bonding strength of graphene oxide and a concrete matrix is enhanced, meanwhile, the nano silver particles can also be combined with chloride ions in a seawater environment to generate silver chloride precipitates, the permeation of chloride ions can be effectively prevented, the corrosion of reinforcing steel bars is prevented, and the durability of concrete and the capability of resisting the corrosion of the chloride ions are improved. The graphene oxide and nano-silver composite nano-particles are prepared into the nano-fluid, so that the nano-particles can be uniformly dispersed without agglomeration in the use process, and the advantage of high surface activity of the nano-material is fully exerted.
Example 10: diffusion coefficient of chloride ion
And curing and molding the concrete raw material mixture, and then putting the concrete raw material mixture into a prepared simulated seawater solution for curing for 28 days and 90 days. The chloride diffusion coefficient after 90 days soaking in the formulated simulated seawater solution was approximately 0.52 x 10 -12 m 2 And/s, the performance of the graphene oxide/silver nano-fluid composite material is obviously better than that of concrete without GO-Ag nano-fluid, and the preparation method shows that the prepared graphene oxide/silver nano-fluid composite material can effectively prevent chloride ions from permeating, prevent reinforcing steel bars from being rusted, and improve the durability and the chloride ion corrosion resistance of the concrete.
Claims (8)
1. A GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete is characterized in that: comprises the following components by weight:
portland cement: 450 portion and 650 portions, water: 280-360 parts of aggregate: 1400-1600 parts of mineral admixture: 20-30 parts of a water reducing agent: 4-8 parts of GO-Ag nanofluid, and 120 parts of GO-Ag nanofluid;
the GO-Ag nanofluid was prepared as follows: mixing 9g KMnO 4 Adding 3g of graphite powder and 1.5g of NaNO at low temperature 3 And 69mL of concentrated H 2 SO 4 Stirring the mixed solution for 30min, adding 138mL of deionized water after the reaction solution is stirred for 1H at 35 ℃, stirring the reaction solution for 20min at 85 ℃, and adding 420mL of deionized water and 3mL of H 2 O 2 Ultrasonic washing after acid washing and drying to obtain flaky productAnd GO is ground into powder, the powder is added into water, GO/water nanofluid with the mass fraction of 0.25 wt.% is prepared, then the GO/water nanofluid and a silver nitrate solution are mixed according to the volume ratio of 1:4, the mixed solution reacts in a reaction kettle at 160 ℃ for 12 hours, composite nanoparticles are obtained after pickling and washing and drying, then the composite nanoparticles are added into water, and ultrasonic vibration is carried out, so that 0.5 wt.% GO-Ag nanofluid is obtained.
2. The GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete according to claim 1, wherein: the aggregate comprises the following components in parts by weight: 15-25 parts of 0.075-0.15mm aggregate, 65-85 parts of 1.18-2.36mm aggregate and 150-170 parts of 9.5-16mm aggregate.
3. The GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete according to claim 1, wherein: the mineral admixture comprises the following components in parts by weight: 50 parts of fly ash and 50 parts of slag.
4. The GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete according to claim 1, wherein: the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 16-18%.
5. The GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete according to claim 1, wherein: the nanofluid was 0.5 wt.% GO-Ag nanofluid.
6. The GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete according to claim 1, wherein: the loading capacity of Ag in the GO-Ag is 20-30%.
7. A preparation method of the GO-Ag nanofluid modified chlorine ion permeation-resistant marine concrete according to any one of claims 1-6, is characterized by comprising the following steps of:
(1) weighing the following raw materials according to a formula: cement, water, aggregate, mineral admixture and water reducing agent, and then stirring to be uniform;
(2) 0.5 wt.% of GO-Ag nanofluid is poured into the mixture obtained in the step 1, and the mixture is continuously stirred until the mixture is uniform;
(3) and (3) putting the mixture obtained in the step (2) into a mold, curing and molding.
8. The method for preparing the GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete according to claim 7, wherein in the step 2, the stirring process is carried out for 3-5 min.
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