CN115321895A

CN115321895A - Anti-corrosion concrete and preparation method thereof

Info

Publication number: CN115321895A
Application number: CN202210982490.4A
Authority: CN
Inventors: 陈卫忠; 程海培; 瞿永明; 沈毅; 李杭春
Original assignee: Hangzhou Yuhang Hengli Concrete Co ltd
Current assignee: Hangzhou Yuhang Hengli Concrete Co ltd
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2022-11-11
Anticipated expiration: 2042-08-16
Also published as: CN115321895B

Abstract

The application discloses an anti-corrosion concrete and a preparation method thereof, wherein the anti-corrosion concrete comprises the following components in parts by weight: 60-80 parts of cement, 800-960 parts of recycled aggregate, 50-60 parts of sugarcane waste residue, 100-245 parts of fly ash, 20-25 parts of anticorrosive agent and 80-110 parts of water; the corrosion inhibitor comprises the following components in parts by weight: 8-12 parts of modified graphene oxide, 6-10 parts of silicon carbide and 2-4 parts of butyl methacrylate; and introducing the waste gas of the thermal power generation into the corrosion-resistant concrete for mineralization maintenance. The anti-corrosion concrete prepared by the method is high in strength and good in anti-corrosion effect, and CO can be sealed and stored in the preparation process ₂ Reduces the carbon emission and the waste recovery, and is an environment-friendly product.

Description

Anti-corrosion concrete and preparation method thereof

Technical Field

The application relates to the field of concrete, in particular to corrosion-resistant concrete and a preparation method thereof.

Background

Concrete is one of the leading civil engineering materials of the present generation. It is an artificial stone material made up by using cementing material, granular aggregate (also called aggregate), water and additive and admixture which are added according to a certain proportion through the processes of uniformly stirring, compacting, curing and hardening. The concrete has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased more and more. Meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like. Due to the characteristics, the method is widely applied to large hydraulic engineering such as bank protection engineering, dam construction and the like.

In the construction of coastal projects, concrete faces serious problems of chloride ion corrosion due to its annual contact with seawater. Concrete can lead to reinforcing bar corrosion inflation under the chloride ion erosion action, not only influences the cohesiveness ability between concrete and the reinforcing bar, and the rust inflation of reinforcing bar can lead to the effective bearing area of reinforced concrete to reduce, accelerates concrete degradation process under the loading effect, causes the crack to appear in advance, finally leads to the concrete to peel off, causes structural function to become invalid.

The nitrite type rust inhibitor is added to reduce corrosion of chloride ions to concrete in the market, but the nitrite type rust inhibitor belongs to an oxidative corrosion inhibitor, and has an anti-corrosion effect only when the content of the nitrite type rust inhibitor in the concrete is enough, but the content of the nitrite type rust inhibitor in the concrete is reduced due to reaction with other substances, and once the content of the nitrite type rust inhibitor is insufficient, corrosion of reinforcing steel bars is aggravated, so that the mechanical strength of the concrete is reduced, the nitrite type rust inhibitor still cannot resist corrosion of seawater for a long time, and the service life of the concrete in coastal engineering is shortened.

Disclosure of Invention

In order to improve the corrosion problem of concrete, which can resist seawater for a long time, the first object of the present application is to provide a corrosion-resistant concrete.

The second purpose of the invention is to provide a preparation method of the corrosion-resistant concrete, which has the advantages of simple preparation method and easy operation.

In order to achieve the first object, the invention provides the following technical scheme:

the corrosion-resistant concrete comprises the following components in parts by weight: 60-80 parts of cement, 800-960 parts of recycled aggregate, 50-60 parts of sugarcane waste residue, 100-245 parts of fly ash, 20-25 parts of anticorrosive agent and 80-110 parts of water; the corrosion inhibitor comprises the following components in parts by weight: 8-12 parts of modified graphene oxide, 6-10 parts of silicon carbide and 2-4 parts of butyl methacrylate;

and introducing the corrosion-resistant concrete into waste gas of thermal power generation for mineralization and maintenance.

By adopting the technical scheme, as the anti-corrosion concrete adopts cement, recycled aggregate, fly ash and water, and sea sand with higher chloride ion content is not added, the chloride ion content in the concrete is not high, and the corrosion of chloride ions in the concrete to the concrete can be reduced. As the fly ash is added, the chemical components in the fly ash contain active SiO ₂ And Al ₂ O ₃ The concrete corrosion inhibitor has the advantages that the concrete corrosion inhibitor can perform chemical reaction with alkaline substances such as potassium hydroxide and the like in a humid environment to generate gelled substances such as hydrated potassium silicate, hydrated potassium aluminate and the like, plays a role in enhancing concrete, blocks capillary tissues in the concrete, and improves the corrosion resistance of the concrete. The recycled aggregate is the aggregate recovered and reprocessed from the waste concrete, thereby not only reducing the environmental problem caused by excessive excavation of natural sandstone, but also recycling the waste building waste and reducing the consumption of limited natural resources; and a large amount of mortar is adhered to the surface of the recycled aggregate, and the calcium hydroxide and calcium silicate hydrate gel in the mortar can absorb CO in the environment ₂ Inorganic carbonate with good stability is formed, gaps of the slurry are filled, the microstructure of the concrete is more compact, and CO in the environment is reduced ₂ The carbon fixation is achieved.

Besides basic materials such as cement, recycled aggregate and the like, sugarcane waste residue and an anticorrosive agent consisting of modified graphene oxide, silicon carbide and butyl methacrylate are added. Because the sugarcane waste residues are left by industrial cane sugar production, the waste residues occupy a large amount of land, and the waste residues are usually subjected to incineration treatment, so that a large amount of harmful gas is generated to pollute the environment. The application of the cellulose and hemicellulose in the sugarcane waste residue can solve the problem of treatment of the sugarcane waste residue, fill the pores of the recycled aggregate, hinder the expansion of cracks in the concrete, improve the crack resistance and toughness of the concrete, improve the water permeability of the concrete and reduce the corrosion of seawater to the concreteAnd (4) corrosion. Sugar such as sucrose and glucose and its derivatives are also present in the waste residue of sugarcane, and such sugar can promote C ₃ Hydrolysis of S but inhibition of C ₃ Initial hydration of S, and C ₃ S has the function of solubilizing the cement, so that the growth of the initial hydration product of the concrete is more uniform, rod-shaped Aft is generated to fill up gaps generated when the recycled aggregate and the cement are stirred, the structure of the hydration product is more compact, and the compressive strength and the corrosion resistance of the concrete can be improved.

The modified graphene oxide in the added corrosion inhibitor has a small size effect and a two-bit lamellar structure, can be filled in the pores of concrete, reduces the phenomenon that an ionic corrosion medium is immersed into a metal matrix, enhances the physical isolation effect of a concrete layer, and enhances the corrosion resistance of the concrete; meanwhile, the surface effect of the modified graphene oxide causes the graphene oxide to have good waterproof effect, so that the penetration of seawater into the concrete can be reduced, and the corrosion of the seawater is further reduced; the modified graphene oxide has strong polarity, and can adsorb silicon carbide and simultaneously adsorb in concrete, so that the silicon carbide and the graphene oxide can stably exist in the concrete when sea waves impact, and more stable mechanical strength is provided. The silicon carbide in the corrosion inhibitor has higher strength and better stability, can enhance the strength and the stability of concrete, reduces the permeation of seawater into the concrete, and further reduces the corrosion of seawater; and the silicon carbide is adsorbed on the surface of the modified graphene oxide, so that the water contact angle of the graphene oxide is increased, and the hydrophobic property of the modified graphene oxide is improved. Butyl methacrylate in the corrosion inhibitor has good viscosity and toughness, can improve the filling efficiency of the corrosion inhibitor to concrete pores, and reduces the reduction of the mechanical strength of the concrete caused by larger pores of the recycled aggregate, and the butyl methacrylate can generate a self-polymerization reaction to form a high polymer, and is connected with silicon carbide and modified graphene oxide to form a three-dimensional network structure, so that the water retention of the concrete is improved while the water resistance of the concrete is reduced, the bleeding of the concrete is further reduced, the collapse of the concrete is reduced, and the corrosion of seawater to the concrete is reduced; and the anticorrosive agent can be filled with the sugarcane waste residues, and a net structure formed by connecting the cellulose and the cellulose is mutually wound with a three-dimensional net structure of the anticorrosive agent, so that the formed concrete structure is more compact, and the mechanical strength of the concrete is improved.

Because the manufacturing process of the portland cement can generate higher CO ₂ Emission, the application adopts the fly ash to replace most of cement, and reduces CO ₂ And curing the concrete by mineralizing the waste gas of the thermal power generation to remove CO in the waste gas ₂ 、SO ₂ When the waste gas is sealed in the concrete, the carbon emission is reduced, and meanwhile, the mechanical strength of the concrete after the waste gas mineralization curing is adopted is improved, the porosity is reduced, and the corrosion of seawater to the concrete can be further reduced.

Preferably, the preparation method of the corrosion inhibitor comprises the following steps:

(1) Mixing the modified graphene oxide with silicon carbide, grinding, and sieving with a 100-200-mesh sieve to obtain a first mixture;

(2) Adding the mixture I obtained in the step (1) into butyl methacrylate, stirring at the speed of 30-120r/min while adding, and uniformly stirring to obtain a mixture II;

(3) And curing the mixture by using UV, and crushing after curing to prepare the anticorrosive agent.

By adopting the technical scheme, the modified graphene oxide and the silicon carbide are simultaneously ground and then sieved, more silicon carbide is adsorbed on the surface of the modified graphene oxide in the grinding process, and the particle sizes of the silicon carbide and the modified graphene oxide are ground and refined, so that the agglomeration effect of the modified graphene oxide is reduced, the dispersibility of the anticorrosive agent in concrete is improved, and the compression resistance of the concrete is further improved. Butyl methacrylate can be cured under UV irradiation, modified graphene oxide and silicon carbide are mixed before the butyl methacrylate is cured, butyl methacrylate can flow on the surfaces of the modified graphene oxide and the silicon carbide, pores on the surfaces of the modified graphene oxide and the silicon carbide are filled, the cured butyl methacrylate is hardened, and the formed three-dimensional network structure can provide good support for resisting sea wave impact to concrete, reduce cracks in the concrete, further improve the strength and the water resistance of the concrete, and further improve the corrosion resistance of the concrete.

Preferably, the preparation method of the modified graphene oxide comprises the following steps:

(1) Dispersing graphene oxide in water, and performing ultrasonic dispersion to obtain a graphene oxide dispersion liquid;

(2) Dissolving potassium ascorbate in water, and stirring until the potassium ascorbate is completely dissolved to obtain a potassium ascorbate solution;

(3) Dissolving 2-aminoanthraquinone in dimethyl sulfoxide, and gradually dripping hydrochloric acid to obtain AAQH ⁺ Cl ^- A solution;

(4) Mixing the graphene oxide dispersion liquid obtained in the step (1) and the potassium ascorbate solution obtained in the step (2), stirring at the temperature of 1-10 ℃ for 4-6h, and adding the AAQH obtained in the step (3) ⁺ Cl ^- Mixing the solution, continuously stirring for 45-55min, filtering, alternately washing with absolute ethyl alcohol and deionized water to obtain a solid A, and freeze-drying the solid A for 24-36h to obtain modified graphene oxide; wherein the mass ratio of the graphene oxide to the potassium ascorbate to the 2-aminoanthraquinone is 1.6-3.0.

According to the technical scheme, a plurality of carboxyl, hydroxyl, epoxy group and other active groups exist on the surface of the graphene oxide, and the potassium ascorbate is used as a reducing agent to induce the graphene oxide to self-assemble at low temperature and normal pressure to form the high-performance graphene oxide hydrogel. Hydrophobic effect and covalent acting force between the high-performance graphene oxide hydrogel two-dimensional lamellar structures are increased, and mechanical strength and chemical stability of the modified graphene oxide are improved. 2-aminoanthraquinone dissolves (AAQ) covalently grafts the amino group of the AAQ onto the graphene oxide sheet through the ring-opening reaction of the epoxy functional group of the graphene oxide, the grafting rate of the graphene oxide in a hydrogel state with the AAQ can be improved due to a special laminated structure, the graphene oxide sheet modified by the AAQ can be assembled with the graphene oxide hydrogel through covalent acting force to form a porous hydrogel compound with stronger mechanical strength and chemical stability, and the mechanical strength and the corrosion resistance of concrete are improved. The formed hydrogel can absorb water in the concrete, so that the breakage of cellulose in the sugarcane waste residues caused by water immersion is reduced, the maintenance of the mechanical strength of the concrete is prolonged, and the corrosion caused by the circulation of chloride ions in the concrete is also reduced. The porous hydrogel composite can also carry other concrete components such as silicon carbide, fly ash and the like, so that the concrete has good internal elasticity trend and compressive strength when being compressed.

Preferably, the fly ash is class C and class II fly ash, and the fly ash further comprises silicon powder and superfine slag according to the mass ratio of 1.

By the technical scheme, the content of lime in the class C fly ash is more than 20%, the lime can improve the crack resistance of concrete after being mixed with cement and aggregate, the lime can react with the cement without an activating agent, and the energy consumption is reduced. The silica powder can improve the early strength of the concrete, the superfine slag has a filling effect and can increase the cohesiveness of a stirred material, the silica powder and the superfine slag can both fill slurry gaps existing in the stirring process of the recycled aggregate and the cement, and the later strength of the concrete is improved, and when the proportion of the silica powder to the superfine slag is 1.8-2.4, the concrete doped with the fly ash has better mechanical strength; the silica powder and the superfine slag can form compact black rust at the initial stage of chloride ion corrosion to cover the surface layer of the steel bar, so that the subsequent corrosion of the chloride ions to the steel bar is reduced; the combination of the siliceous material and the cementing material formed by the concrete corrosion inhibitor can not only reduce the porosity of the concrete, but also reduce the mobility of fine particles in the concrete, increase the resistance of the whole particle framework to water flow channels, enhance the water resistance of the concrete and simultaneously reduce the corrosion of the internal chloride ion enrichment on reinforcing steel bars.

The silicon powder and the slag in the fly ash can react with the calcium hydroxide in the recycled aggregate and the lime to obtain the gamma-C ₂ S，γ-C ₂ S can be adsorbed on the surface of each component of the concrete, the area of mineralization reaction is enlarged, and CO capture of the concrete is enhanced ₂ The carbon emission is reduced, the compressive strength of the concrete is enhanced, and the concrete is further enhancedCorrosion resistance of the soil.

Preferably, the fly ash is pretreated by: putting the fly ash into a high-pressure kettle, autoclaving at 800-900 ℃ and 2-2.5 atmospheres for 4-6h, and then dehydrating and cooling.

Through the technical scheme, the fly ash is calcined at high temperature, which is beneficial to destroying firm SiO ₂ · Al ₂ O ₃ Forming active Al ₂ O ₃ Obviously changes the phase composition and microstructure of the mineral and improves the activity of the fly ash. Calcium oxide and SiO in fly ash under high temperature and high pressure ₂ · Al ₂ O ₃ Anorthite can be generated by combination, so that the mechanical strength and corrosion resistance of the fly ash are enhanced; the anorthite can also improve the gap existing when the cement and the recycled aggregate are stirred, so that the slurry of the concrete is more compact. In addition, limestone left by high-temperature calcination of fly ash has good CO ₂ The sealing property can capture more CO in the later stage of concrete mineralization ₂ The carbon emission is reduced, and the mineralization effect is improved.

Preferably, the sugarcane waste residue is pretreated by the following steps:

soaking the waste residue of sugarcane in hydrogen peroxide at 5-15 deg.C for 2-4 hr, filtering, drying, grinding into powder, and sieving with 300-600 mesh sieve.

By adopting the technical scheme, the hydrogen peroxide can kill harmful flora in the sugarcane waste residue, reduce biological corrosion caused by metabolism of sulfur bacteria or nitrobacteria in concrete, and promote C by cane sugar and glucose ₃ S is hydrolyzed, but hydration of the ettringite (AFt) is inhibited by destroying the crystal structure of the AFt, so that the hydration of concrete is slowed down; glucose is oxidized into sodium gluconate by hydrogen peroxide, the sodium gluconate also has a retarding effect at the initial stage of concrete hydration, but as the hydration progresses, an unstable complex formed by carboxyl contained in the sodium gluconate and calcium ions in a solution is automatically decomposed along with the hydration, so that the hydration is continued, the later-stage solidification of the concrete is not influenced, and the initial-stage anticorrosive agent and the sugarcane waste residues can be better dispersed in the concrete; and slow down the hydration speed of the concrete in the initial stageThe method can reduce cracks and pores generated in the concrete, so that the filling effect of the anticorrosive agent is better, and the corrosion resistance of the concrete is improved.

Preferably, the cement is 42.5-grade ordinary portland cement.

By adopting the technical scheme, more Friedel salt is generated by adopting the cement with higher aluminate content, the binding capacity to chloride ions is enhanced, and the corrosion to concrete is accelerated. Therefore, the application adopts 42.5-grade ordinary portland cement with lower aluminosilicate content.

In order to achieve the second object, the invention provides the following technical scheme:

a preparation method of corrosion-resistant concrete comprises the following steps:

s1, adding an anticorrosive agent into 20-30 parts of water, and stirring at 50-60 ℃ for 40-50min to obtain a component A;

s2, mixing cement, aggregate, sugarcane waste residue and fly ash, and uniformly stirring to obtain a component B;

s3, uniformly mixing the component A obtained in the step S1 with the component B obtained in the step S2, adding the rest water, and continuously and uniformly stirring to obtain the corrosion-resistant concrete;

and (4) when the step (S3) is carried out, introducing the waste gas of the thermal power generation while stirring for mineralizing and curing.

By adopting the technical scheme, the corrosion inhibitor is independently dissolved, and homopolymerization or reaction with other components in the concrete before hydration is avoided, so that the mechanical strength or the corrosion resistance of the concrete is influenced. The cement, the aggregate and the sugarcane waste residue are mixed and stirred, and then the component A and the component B are mixed, so that the initial hydration of the concrete is slowed down, the mobility of the anticorrosive agent in the concrete is enhanced, and the mechanical strength and the corrosion resistance of the concrete are improved. CO in exhaust gas ₂ Can be mixed with C in cement ₃ S and/or beta-C ₂ S formation of amorphous silica gel SiO ₂ ·nH ₂ O can fill the gap generated by recycled aggregate or cement, improve the early mechanical strength of concrete, and can also convert CH into stable inorganic carbonate, because CH is the source of crack and can erode chloride ions quickly when the concrete is stressedThe channel indirectly improves the early strength and the chlorine ion corrosion resistance of the concrete. CO in exhaust gas ₂ CaCO formed by mineralization reaction of calcium hydroxide and calcium silicate hydrate gel attached to the surface of aggregate ₃ And amorphous SiO ₂ ·H ₂ The O silica gel is filled in the pores of the slurry, so that the carbon emission of a factory is reduced, the porosity of the concrete is reduced, and the mechanical strength and the corrosion resistance of the concrete are improved.

In summary, the present application has the following beneficial effects:

1. in the application, cement, aggregate, fly ash and water are adopted, sea sand with higher chloride ion content is not added, and the chloride ion content in the concrete is not high. As the fly ash is added, the chemical components in the fly ash contain active SiO ₂ And Al ₂ O ₃ The concrete corrosion inhibitor has the advantages that the concrete corrosion inhibitor can perform chemical reaction with alkaline substances such as potassium hydroxide and the like in a humid environment to generate gelled substances such as hydrated potassium silicate, hydrated potassium aluminate and the like, plays a role in enhancing concrete, blocks capillary tissues in the concrete, and improves the corrosion resistance of the concrete.

2. Butyl methacrylate in the corrosion inhibitor has good viscosity and toughness, the filling efficiency of the corrosion inhibitor to concrete pores can be improved, the butyl methacrylate can generate self-polymerization to form a high polymer, and the high polymer, silicon carbide and modified graphene oxide form a three-dimensional network structure, so that the water retention of concrete is improved while the water resistance of the concrete is reduced, the bleeding of the concrete is further reduced, the collapse of the concrete is reduced, and the corrosion of seawater to the concrete is reduced.

3. The application prepares a corrosion resistant concrete, and it is common knowledge in the concrete field that chloride ions accelerate concrete carbonization and thus the corrosion of steel bars in concrete. But this application replaces most cement through the ratio of control aggregate and fly ash, then uses the waste gas that thermal power produced to carry out the mineralize mineralization maintenance to the concrete, has reduced the porosity of concrete on the contrary, has improved the mechanical strength of concrete, has further improved the protection to reinforcing bar in the concrete when having reduced carbon emission.

Detailed Description

The present application will be described in further detail with reference to examples.

The starting materials used in the examples and preparation examples are commercially available.

Preparation of modified graphene oxide

Preparation example 1-1, a method for preparing modified graphene oxide, comprising the steps of:

(1) Dispersing 1kg of graphene oxide in 1L of water, and performing ultrasonic dispersion for 45min to obtain a graphene oxide dispersion liquid;

(2) Dissolving 3kg of potassium ascorbate in 1L of water, and stirring at the rotation speed of 80r/min for 30min to obtain a potassium ascorbate solution;

(3) 0.8kg of 2-aminoanthraquinone (AAQ) was dissolved in 500mL of dimethyl sulfoxide solution, and 100mL of 1mol/L HCl solution was gradually added dropwise to obtain AAQH ⁺ Cl ^- A solution;

(4) Stirring the graphene oxide dispersion liquid prepared in the step (1) and the potassium ascorbate solution prepared in the step (2) at 1 ℃ for 6h, and then adding AAQH ⁺ Cl ^- And mixing the solution, continuously stirring for 50min, filtering, alternately washing with absolute ethyl alcohol and deionized water for three times to obtain a solid, and freeze-drying the solid A for 36h to obtain the modified graphene oxide.

Preparation example 1-2, a method for preparing modified graphene oxide, comprising the steps of:

(2) Dissolving 2.8kg of potassium ascorbate in 1L of water, and stirring at 80r/min for 30min to obtain a potassium ascorbate solution;

(3) Dissolving 0.5kg 2-aminoanthraquinone (AAQ) in 500ml dimethyl sulfoxide solution, gradually dropping 100ml 1mol/L HCL solution to obtain AAQH ⁺ Cl ^- And (3) solution.

(4) Stirring the graphene oxide dispersion liquid prepared in the step (1) and the ascorbic acid prepared in the step (2) at 10 ℃ for 5h, and then adding AAQH ⁺ Cl ^- Mixing the solutions, stirring for 55min, filtering, and collecting filtrateAnd alternately washing the graphene oxide by using absolute ethyl alcohol and deionized water for three times to obtain a solid, and freeze-drying the solid A for 30 hours to obtain the modified graphene oxide.

Preparation examples 1 to 3, a modified graphene oxide was prepared by the following method:

(2) Dissolving 2.6kg of potassium ascorbate in 1L of water, and stirring at 80r/min for 30min to obtain a potassium ascorbate solution;

(3) Dissolving 0.2kg 2-aminoanthraquinone (AAQ) in 500ml dimethyl sulfoxide solution, and gradually dropping 100ml 1mol/L HCL solution to obtain AAQH ⁺ Cl ^- And (3) solution.

(4) Stirring the graphene oxide dispersion liquid prepared in the step (1) and the ascorbic acid prepared in the step (2) at 6 ℃ for 4h, and then adding AAQH ⁺ Cl ^- And mixing the solution, continuously stirring for 50min, filtering, alternately washing with absolute ethyl alcohol and deionized water for three times to obtain a solid, and freeze-drying the solid A for 24h to obtain the modified graphene oxide.

Preparation examples 1 to 4, a method for preparing modified graphene oxide, were different from the preparation examples 1 to 1 in that the stirring temperature in the step (4) was 25 ℃.

Preparation examples 1 to 5, a method for preparing modified graphene oxide, were different from the preparation examples 1 to 1 in that the step (2) was not performed.

Preparation examples 1 to 6, a method for preparing modified graphene oxide, were different from the preparation examples 1 to 1 in that the step (3) was not performed.

Preparation of fly ash

In the preparation example 2-1, the fly ash is class C and class II fly ash, and the fly ash further comprises silicon powder and superfine slag with the mass ratio of 1; the fly ash is pretreated by the following steps: putting the fly ash into a high-pressure kettle, autoclaving at 800 ℃ and 2.5 atmospheres for 6h, and then dehydrating and cooling.

Preparation example 2-2 was different from preparation example 2-1 in that fly ash was subjected to the following pretreatment: putting the fly ash into a high-pressure kettle, autoclaving at 900 ℃ and 2 atmospheres for 4h, and then dehydrating and cooling.

Preparation example 2-3, which is different from preparation example 2-1, was that fly ash was pretreated as follows: putting the fly ash into an autoclave, autoclaving at 850 ℃ and 2 atmospheres for 5h, and then dehydrating and cooling.

Preparation examples 2 to 4 were different from preparation example 2 to 1 in that the autoclaving temperature in the pretreatment of fly ash was 700 ℃.

Preparation examples 2-5 were different from preparation example 2-1 in that the autoclaving temperature in the pretreatment of fly ash was 1000 ℃.

Preparation examples 2-6 were different from preparation example 2-1 in that fly ash was replaced with an equal amount of untreated fly ash.

Preparation example 2-7 was different from preparation example 2-1 in that the fly ash contained no silica powder and no ultrafine slag.

Preparation of waste sugarcane residue

Preparation example 3-1, sugarcane waste residue was pretreated as follows: soaking the waste residue of caulis Sacchari sinensis in 10L 30% hydrogen peroxide solution at 5 deg.C for 4 hr, filtering, drying, grinding into powder, and sieving with 300 mesh sieve.

Preparation example 3-2, sugarcane waste residue was pretreated as follows: soaking the waste residue of caulis Sacchari sinensis in 10L 30% hydrogen peroxide solution at 15 deg.C for 6 hr, filtering, drying, grinding into powder, and sieving with 600 mesh sieve.

Preparation examples 3 to 3, the sugarcane waste residue was pretreated as follows: soaking the waste residue of caulis Sacchari sinensis in 10 deg.C 10L 30% hydrogen peroxide for 5 hr, filtering, drying, grinding into powder, and sieving with 450 mesh sieve.

Preparation example 3-4 was different from preparation example 3-1 in that the mesh number of the screen was 750 mesh in the pretreatment of the waste sugarcane residue.

Preparation examples 3 to 5 were different from preparation example 3 to 1 in that the mesh number of the screen was 150 mesh in the pretreatment of the waste sugarcane residue.

Preparation examples 3 to 6 were different from preparation example 3 to 1 in that the sugarcane trash was replaced with an equal amount of sugarcane trash without pretreatment.

Examples

Example 1

The corrosion-resistant concrete comprises the following components in parts by weight: 70kg of cement, 900kg of recycled aggregate, 55kg of sugarcane waste residue, 170kg of fly ash, 25kg of anticorrosive agent and 95kg of water; the corrosion inhibitor comprises the following components in parts by weight: 8kg of modified graphene oxide, 10kg of silicon carbide and 3kg of butyl methacrylate; and introducing the corrosion-resistant concrete into the waste gas of the thermal power generation for mineralization maintenance.

The preparation method of the corrosion-resistant concrete comprises the following steps:

s1, adding 25kg of corrosion inhibitor into 25kg of water, and stirring for 40min at 50 ℃ to obtain a component A;

s2, mixing 70kg of cement, 900kg of recycled aggregate, 55kg of sugarcane waste residue and 170kg of fly ash, and uniformly stirring to obtain a component B;

and S3, uniformly mixing the component A and the component B, adding 70kg of water, continuously stirring, and introducing waste gas generated by thermal power generation while stirring for mineralization maintenance to prepare the corrosion-resistant concrete.

Wherein the modified graphene oxide is obtained from preparation example 1-1, and the sugarcane waste residue is obtained from preparation example 3-1; the fly ash is from preparation example 2-1; the cement is 42.5-grade ordinary portland cement.

The corrosion inhibitor is prepared by the following steps:

(1) Grinding 16kg of modified graphene oxide and 20kg of silicon carbide for 1 hour and sieving to obtain a mixture A;

(2) The mixture A was added to 6kg of butyl methacrylate and stirred at 80r/min for 2h to give a mixture B.

(3) And doping a photoinitiator, irradiating the mixture B for 4 hours by using UV (ultraviolet), and crushing the mixture into particles with the particle size of 10mm to prepare the anticorrosive agent.

Example 2

The corrosion-resistant concrete is different from the concrete in example 1 in that the corrosion-resistant concrete comprises the following components in parts by weight: 80kg of cement, 960kg of recycled aggregate, 60kg of sugarcane waste residue, 100kg of fly ash, 20kg of anticorrosive agent and 110kg of water; the corrosion inhibitor comprises the following components in parts by weight: 10kg of modified graphene oxide, 8kg of silicon carbide and 4kg of butyl methacrylate.

Wherein the modified graphene oxide is prepared by the preparation example 1-2; the fly ash is from preparation example 2-2, and the sugarcane waste residue is from preparation example 3-2.

Example 3, a corrosion resistant concrete, different from example 1, comprising the following components in parts by weight: 60kg of cement, 800kg of recycled aggregate, 50kg of sugarcane waste residue, 245kg of fly ash, 23kg of anticorrosive agent and 80kg of water; the corrosion inhibitor comprises the following components in parts by weight: 12kg of modified graphene oxide, 6kg of silicon carbide and 2kg of butyl methacrylate.

Wherein the modified graphene oxide is prepared by the preparation examples 1-3; the fly ash is from preparation examples 2-3, and the sugarcane waste residue is from preparation examples 3-3.

Example 4 is different from example 1 in that modified graphene oxide was prepared using preparation examples 1 to 4.

Example 5 is different from example 1 in that modified graphene oxide was prepared using preparation examples 1 to 5.

Example 6 is different from example 1 in that modified graphene oxide was prepared using preparation examples 1 to 6.

Example 7 differs from example 1 in that the fly ash originates from preparations 2 to 4.

Example 8 differs from example 1 in that the fly ash was derived from preparation examples 2-5.

Example 9 differs from example 1 in that the fly ash was derived from preparation examples 2-6.

Example 10 differs from example 1 in that the fly ash was derived from preparations 2-7.

Example 11 differs from example 1 in that the waste sugar cane dregs originate from preparation examples 3 to 4.

Example 12 differs from example 1 in that the sugar cane trash originates from preparation examples 3 to 5.

Example 13 differs from example 1 in that the sugar cane trash originates from preparation examples 3-6.

Comparative example

Comparative example 1, a corrosion resistant concrete, differs from example 1 in that the corrosion inhibitor is a seawater corrosion preventing rebar corrosion inhibitor incorporating a type compacting agent chlorine salt resistance.

Comparative example 2, a corrosion resistant concrete, differs from example 1 in that the sugar cane trash was replaced by equal amounts of straw.

Comparative example 3, a corrosion resistant concrete, differs from example 1 in that 30% of the aggregate was replaced by an equal amount of sea sand.

Comparative example 4, a corrosion resistant concrete, differs from example 1 in that butyl methacrylate is replaced with an equal amount of methyl methacrylate.

Comparative example 5, a corrosion resistant concrete, differs from example 1 in that the recycled aggregate is replaced with an equal amount of conventional aggregate.

Comparative example 6 is different from example 1 in that the modified graphene oxide is replaced with the same amount of silicon carbide.

Comparative example 7 differs from example 1 in that the silicon carbide is replaced with an equal amount of modified graphene oxide.

Comparative example 8, which is different from example 1 in that modified graphene oxide was replaced with the same amount of the above-mentioned unmodified graphene oxide

Comparative example 9 is different from example 1 in that the corrosion-resistant concrete is not mineralized and cured by introducing exhaust gas from thermal power generation.

Comparative example 10, a method for preparing corrosion-resistant pervious concrete, comprising the steps of:

(1) Adding 1500kg of basalt broken stones, adding 60kg of water, and stirring at the rotating speed of 23 revolutions per minute for 40 seconds to obtain a mixture I;

(2) Adding 320kg of cement and 30kg of slag micro powder into the mixture I, adding 60kg of water, and continuously stirring for 30 seconds at the rotating speed of 23 revolutions per minute to obtain a mixture II;

(3) 5kg of lignin fiber and 5kg of sulfamate water reducing agent are added into the mixture II, and the mixture is continuously stirred for 80 seconds at the rotating speed of 23 revolutions per minute, so that the corrosion-resistant pervious concrete is obtained.

Comparative example 11, a corrosion resistant concrete, differs from example 1 in comprising the following components in parts by weight: 220kg of cement, 1000kg of recycled aggregate, 30kg of sugarcane waste residue, 75kg of fly ash, 25kg of anticorrosive agent and 118kg of water; the corrosion inhibitor comprises the following components in parts by weight: 8kg of modified graphene oxide, 10kg of silicon carbide and 3kg of butyl methacrylate.

Performance test

Test 1:

the concrete was prepared according to the method of each example and each comparative example, the concrete was placed in a mold of 150mm × 150mm × 150mm, the mold was placed in a standard curing box and cured for 31 days, three samples were taken for each example or comparative example, the test results were averaged and recorded in table 1, and the test method was as follows:

1. permeability coefficient of chloride ion: detection is carried out according to B/T749-2008 & lttest method for sulfate corrosion resistance of cement'.

2. Compressive strength: the detection is carried out according to GB/T50081-2002 standard of test methods for mechanical properties of common concrete.

3. Soaking the test block in water for 24h, testing the mass m1 of the test block in the water, then air-drying the test block for 24h, testing the mass m2 of the test block, and calculating the porosity P of the concrete according to the following formula: p = [1- (m 2-m 1)/V ρ water ] × 100%.

TABLE 1 Performance test results for anti-corrosive concretes

Detecting items	Diffusion coefficient of chloride ion of 7 d/. Times.10 ^-12 m ² /s	Diffusion coefficient of chloride ion 28 d/. Times.10 ^-12 m ² /s	7d compressive Strength (MPa)	28d compressive Strength (MPa)	Porosity (%)
						Example 1	0.8	1.21	41.6	48.7	15.3
Example 2	0.82	1.24	40.9	47.6	15.5
						Example 3	0.9	1.27	40.5	47.3	15.8
Example 4	1.1	2.1	38.7	45.5	17.8
						Example 5	1.15	2.14	38	45.1	18
Example 6	1.66	2.67	38.2	45.3	16.9
						Example 7	1.4	1.66	37.3	44.1	18.9
Example 8	1.34	1.63	37.7	44.6	18.6
						Example 9	1.72	1.98	35.6	42.7	19.6
Example 10	1.56	2.14	34.8	41.2	18.5
						Example 11	0.92	1.32	38.7	46.9	15.4
Example 12	0.95	1.34	38.2	46.3	15.7
						Example 13	0.97	2.41	38.5	46.4	15.5
Comparative example 1	1.4	3.26	30.7	33.7	20.4
						Comparative example 2	1.32	3.77	36.3	43.2	18.6
Comparative example 3	3.3	6.26	34.2	33.1	19.3
						Comparative example 4	1.7	3.16	40.3	46.1	18.4
Comparative example 5	1.06	1.45	41.3	47.9	17.2
						Comparative example 6	2.4	4.03	37.6	44.3	18.4
Comparative example 7	2.1	4.57	41.3	49.2	18.9
						Comparative example 8	1.24	1.89	36.1	42.6	16.1
Comparative example 9	0.92	1.44	38.9	47	17.6
						Comparative example 10	6.312	/	/	/	/
Comparative example 11	1.3	2.32	35.3	37.6	19.4

By combining the examples 1-3 and the table 1, it can be seen that the corrosion inhibitor prepared by adding the modified graphene oxide, the silicon carbide and the butyl methacrylate has good chloride ion corrosion resistance of the finished concrete, and has relatively low porosity and relatively high compressive strength; the chlorine ion corrosion resistance is basically unchanged along with the time lapse, and the compressive strength of the concrete is enhanced because the modified graphene oxide has a small size effect and a two-position lamellar structure, can be filled into the pores of the concrete, reduces the phenomenon that an ion corrosion medium is immersed into a metal matrix, enhances the physical isolation effect of a concrete layer, and enhances the corrosion resistance of the concrete; meanwhile, the surface effect of the modified graphene oxide causes the graphene oxide to have a good waterproof effect, so that the permeation of seawater into concrete can be reduced, and the corrosion of seawater is further reduced. The silicon carbide in the corrosion inhibitor has higher strength and better stability, can enhance the mechanical strength and stability of concrete, can reduce the permeation of seawater into the concrete, and further reduces the corrosion of seawater. Butyl methacrylate in the corrosion inhibitor has good viscosity and toughness, the filling efficiency of the corrosion inhibitor to concrete pores can be improved, the butyl methacrylate can generate self-polymerization to form a high polymer, and the high polymer, silicon carbide and modified graphene oxide form a three-dimensional network structure, so that the water retention of concrete is improved while the water resistance of the concrete is reduced, the bleeding of the concrete is further reduced, the collapse of the concrete is reduced, and the corrosion of seawater to the concrete is reduced.

As can be seen from examples 1 and 4 and table 1, the effect of modifying graphene oxide at normal temperature is not as good as that of modifying graphene oxide at low temperature because graphene oxide has high reactivity and can inhibit the generation of other side reactions at low temperature, thereby improving the modification degree of graphene oxide by potassium ascorbate.

According to the examples 1 and 5, the example 6, the comparative example 9 and the table 1, the corrosion inhibitor prepared by modifying the graphene oxide with the potassium ascorbate and the AAQ has a great improvement on the corrosion resistance and the compressive strength of the concrete, and the modification of the graphene oxide with the potassium ascorbate and the AAQ has a synergistic effect on the improvement of the corrosion resistance and the compressive strength of the concrete, because the graphene oxide sheets modified by the AAQ can be assembled with the graphene oxide hydrogel through covalent force to form the porous hydrogel composite with stronger mechanical strength and chemical stability.

According to the example 1, the example 7, the example 8 and the table 1, the pretreatment temperature of the fly ash is 800-900 ℃, the mechanical strength and the corrosion resistance of the concrete are better, because when the calcination temperature is less than 800 ℃, the calcination can not remove some harmful carbon substances, and some substances can not be completely activated, thereby influencing the improvement of the activity of the fly ash; when the calcination temperature is higher than 900 ℃, the coal ash is agglomerated, part of substances in the coal ash are changed into liquid, and the activity of the coal ash is reduced.

It can be seen from examples 1, 9 and table 1 that the addition of untreated fly ash to coagulationThe mechanical strength and corrosion resistance of the soil are not greatly improved because the unactivated fly ash is not strong in activity and the calcium oxide and SiO in the fly ash are not high-temperature and high-pressure ₂ · Al ₂ O ₃ The anorthite can be generated by combination, so that gaps generated by concrete cracks are further filled, and the mechanical strength and corrosion resistance of the fly ash are enhanced.

According to examples 1 and 10 and Table 1, it can be seen that the corrosion resistance and mechanical strength of the concrete prepared by adding the fly ash containing no silica powder and ultrafine slag are reduced because the silica powder and ultrafine slag can fill the slurry gap existing when the recycled aggregate and cement are stirred, and the mechanical strength of the concrete is improved; the silica powder and the superfine slag can form compact black rust at the initial stage of chloride ion corrosion to cover the surface layer of the steel bar, so that the subsequent corrosion of the chloride ion to the steel bar is reduced.

According to the embodiment 1, the embodiment 11, the embodiment 12 and the table 1, the sugarcane waste residue is ground into powder, and after the powder is screened by a screen with the mesh number of 300-600 meshes, the concrete added with the sugarcane waste residue is good in performance. The reason is that the sugarcane waste residue obtained by selecting the screen with the mesh number smaller than 300 is too large in particle size and not uniform enough in dispersion in the concrete, so that the effect of hindering the expansion of cracks in the concrete is influenced; the grain size of the sugarcane waste residue obtained by selecting the screen with the mesh number larger than 600 meshes is too small, the cellulose and hemicellulose of the sugarcane waste residue reduce the effect of improving the mechanical strength of concrete, the filling of pores in the concrete is influenced, and the improvement of the crack resistance and the toughness of the concrete is influenced.

As can be seen from examples 1 and 13 and Table 1, the waste sugarcane dregs are directly used in concrete without pretreatment, and the chloride ion corrosion resistance and compressive strength of 28d are reduced because the hydrogen peroxide can kill harmful flora in the waste sugarcane dregs, reduce biological corrosion caused by metabolism of sulfur bacteria or nitrobacteria in the concrete, and promote C by cane sugar and glucose ₃ S is hydrolyzed, but the hydration of the AFt is inhibited by destroying the crystal structure of the AFt, so that the hydration of the concrete is slowed down; the glucose is oxidized into the sodium gluconate by the hydrogen peroxide, and the sodium gluconate also has the effect of retarding the coagulation at the initial stage of the concrete hydration, but along with the hydrationThe unstable complex formed by carboxyl contained in the sodium gluconate and calcium ions in the solution is automatically decomposed along with the hydration, so that the hydration is continued, the later solidification of the concrete is not influenced, and the initial anti-corrosion agent and the sugarcane waste residue can be better dispersed in the concrete; and the hydration speed of the concrete in the initial stage is slowed down, cracks and pores generated in the concrete can be reduced, so that the filling effect of the anticorrosive agent is better, the mechanical strength and the waterproof effect of the concrete are improved, and the corrosion resistance of the concrete is improved.

According to the embodiment 1, the comparative example 1 and the table 1, the corrosion inhibitor prepared by the method has better corrosion resistance and better compressive strength compared with a chlorine salt corrosion inhibitor for preventing seawater corrosion of the steel bar corrosion inhibitor, particularly in the later stage of concrete forming, the corrosion resistance of the corrosion inhibitor is mainly to reduce the corrosion of chlorine ions to concrete by reducing the intrusion of an ionic corrosion medium into a metal matrix, enhancing the physical isolation effect of a concrete layer and preventing the penetration of external seawater, and the corrosion inhibitor in the concrete basically does not decline along with the use time.

As can be seen from example 1, comparative example 2 and Table 1, the compressive strength of the concrete obtained by blending the same amount of straw in place of the sugarcane trash residue was not greatly changed, but the concrete was inferior in the post-compressive strength and corrosion resistance because sugars such as sucrose and glucose and derivatives thereof, which promote C, were also present in the sugarcane trash residue ₃ Hydrolysis of S but inhibition of C ₃ Initial hydration of S, and C ₃ S has the function of solubilizing the cement, so that the growth of a hydration product is more uniform, and the needle-rod-shaped AFt is filled into gaps of the cement slurry, so that the structure of the hydration product is more compact, and the compression strength and the corrosion resistance of the concrete can be improved.

According to the example 1, the comparative example 3 and the table 1, the corrosion resistance and the mechanical strength of the concrete doped with the sea sand are not the same as those of the concrete, because the sea sand contains certain chloride ions, the chlorine content of the concrete is increased, and the existence of the chloride ions can strengthen ion paths, reduce the resistance between the cathode and the anode of the reinforcing steel bar and improve the corrosion efficiency, thereby accelerating the electrochemical corrosion process, destroying the mechanical strength of the concrete and increasing the corrosion of the concrete by seawater.

According to the embodiment 1, the comparative example 4 and the table 1, the butyl methacrylate in the corrosion inhibitor is replaced by the same amount of methyl methacrylate, the mechanical strength of the prepared concrete is not changed greatly, but the chloride ion corrosion resistance is reduced, because the butyl methacrylate is palmitic acid, the butyl methacrylate has better viscosity and toughness, the filling efficiency of the corrosion inhibitor on concrete pores can be improved, self-polymerization can be carried out to form high polymers, the butyl methacrylate, silicon carbide and modified graphene oxide form a three-dimensional network structure, the water retention of the concrete is improved while the water resistance of the concrete is reduced, the concrete bleeding is further reduced, the concrete collapse is reduced, and the corrosion of seawater on the concrete is reduced; methyl methacrylate is stearic acid, and cannot form a three-dimensional network structure with silicon carbide and modified graphene oxide, so that the improvement of the waterproofness of concrete is limited, and the penetration of chloride ions in seawater to the concrete cannot be reduced although the mechanical strength of the concrete is improved.

According to example 1, comparative example 5 and table 1, it can be seen that the corrosion resistance of the concrete was inferior to that of the concrete prepared in the present application after the recycled aggregate was replaced with an equivalent amount of conventional aggregate because a large amount of mortar was attached to the surface of the recycled aggregate and the recycled aggregate was cured by passing through the exhaust gas of a thermal power plant. Calcium hydroxide and calcium silicate hydrate gel in the mortar can absorb CO in the environment ₂ Inorganic carbonate with good stability is formed, gaps of the slurry are filled, the microstructure of the concrete is more compact, and the corrosion of seawater is further reduced.

According to the example 1, the comparative example 6 and the table 1, it can be seen that when the modified graphene oxide in the corrosion inhibitor is equivalently replaced by silicon carbide, the compressive strength of the concrete is basically unchanged, but the effect of resisting the chloride ion corrosion is reduced, because the modified graphene oxide has a small size effect and a two-bit lamellar structure, can be filled into the pores of the concrete, reduces the intrusion of the ion corrosion medium into the metal matrix, enhances the physical isolation effect of the concrete layer, and enhances the corrosion resistance of the concrete; meanwhile, the surface effect of the modified graphene oxide causes the graphene oxide to have good waterproof effect, so that the permeation of seawater into concrete can be reduced, and the corrosion of seawater is further reduced.

According to the example 1, the comparative example 7 and the table 1, it can be seen that after the silicon carbide is replaced by the same amount of graphene oxide, the mechanical strength and the chloride ion corrosion resistance of the concrete are both reduced, because the silicon carbide has higher strength and better stability, the mechanical strength and the stability of the concrete can be enhanced, the penetration of seawater into the concrete is reduced, and the corrosion of seawater is further reduced.

According to example 1, comparative example 8 and table 1, it can be seen that the mechanical strength of concrete is reduced by using the same amount of unmodified graphene oxide instead of modified graphene oxide, because many active groups such as carboxyl, hydroxyl and epoxy groups exist on the surface of graphene oxide, and potassium ascorbate is used as a reducing agent to induce the self-assembly of graphene oxide to form a high-performance graphene oxide hydrogel under the conditions of low temperature and normal pressure. Hydrophobic effect and covalent force between the high-performance graphene oxide hydrogel two-dimensional lamellar structures are increased, mechanical strength and chemical stability of the modified graphene oxide are improved, and corrosion of seawater to concrete is reduced.

As can be seen from example 1, comparative example 9 and Table 1, the concrete cured without the exhaust gas from thermal power generation was reduced in mechanical strength and corrosion resistance due to CO in the exhaust gas ₂ Can be mixed with C in cement ₃ S and/or beta-C ₂ S formation of amorphous silica gel SiO ₂ ·nH ₂ And O, the cement gap is filled, the early mechanical strength of the concrete is improved, CH of a crack origin place and a fast channel for eroding chloride ions in the concrete stress process can be converted into stable inorganic carbonate, and the early strength and the chloride ion corrosion resistance of the concrete are improved.

According to example 1, comparative example 10 and table 1, it can be seen that the corrosion-resistant concrete prepared by the prior art method for preparing corrosion-resistant concrete has lower corrosion resistance than the one prepared by the present application because of the synergistic effect among the components of the present application, and thus a corrosion-resistant concrete with better corrosion resistance can be prepared.

As can be seen from example 1, comparative example 11 and Table 1, the corrosion-resistant concrete prepared in example 1 has better performance in terms of mechanical strength and resistance to chloride ion corrosion because the proportion of each component is optimized to meet the requirement of coastal engineering concrete.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. The corrosion-resistant concrete is characterized by comprising the following components in parts by weight: 60-80 parts of cement, 800-960 parts of recycled aggregate, 50-60 parts of sugarcane waste residue, 100-245 parts of fly ash, 20-25 parts of anticorrosive agent and 80-110 parts of water; the corrosion inhibitor comprises the following components in parts by weight: 8-12 parts of modified graphene oxide, 6-10 parts of silicon carbide and 2-4 parts of butyl methacrylate;

and introducing the waste gas of the thermal power generation into the corrosion-resistant concrete for mineralization maintenance.

2. The corrosion-resistant concrete according to claim 1, wherein the preparation method of the corrosion-resistant agent comprises the following steps:

3. The anti-corrosion concrete according to claim 1, wherein the preparation method of the modified graphene oxide comprises the following steps:

(4) Mixing the graphene oxide dispersion liquid obtained in the step (1) and the potassium ascorbate solution obtained in the step (2), stirring at the temperature of 1-10 ℃ for 4-6h, and adding the AAQH obtained in the step (3) ⁺ Cl ^- Mixing the solution, continuously stirring for 45-55min, filtering, alternately washing with absolute ethyl alcohol and deionized water to obtain a solid A, and freeze-drying the solid A for 24-36h to obtain modified graphene oxide; wherein the mass ratio of the graphene oxide to the potassium ascorbate to the 2-aminoanthraquinone is 1.

4. The corrosion-resistant concrete according to claim 1, wherein the fly ash is class C class II fly ash, and the fly ash further comprises silica powder and superfine slag in a mass ratio of 1.

5. The corrosion-resistant concrete according to claim 4, wherein the fly ash is pretreated by: putting the fly ash into a high-pressure kettle, autoclaving at 800-900 ℃ and 2-2.5 atmospheres for 4-6h, and then dehydrating and cooling.

6. The corrosion-resistant concrete according to claim 1, wherein the sugarcane waste residue is pretreated by:

7. A corrosion resistant concrete according to claim 1, wherein said cement is a grade 42.5 portland cement.

8. A method of making a corrosion resistant concrete according to any one of claims 1 to 7 comprising the steps of: