High-ductility anticorrosive concrete

Abstract

The invention relates to the technical field of concrete, in particular to high-ductility anticorrosive concrete. The concrete is prepared from the following raw materials in parts by weight: 100-150 parts of fine aggregate, 100-150 parts of quartz sand, 100-150 parts of 525 cement, 100-150 parts of fly ash, 30-50 parts of water, 20-30 parts of silica fume, 5-10 parts of an additive, 3-8 parts of a flame retardant, 3-5 parts of ultra-high molecular weight polyethylene fibers, 3-5 parts of modified betel nut peel fibers, 1-3 parts of a water reducing agent, 1-3 parts of betel nut pulp polysaccharide colloid and 1-3 parts of a nano reinforcing agent. The problems that traditional concrete is high in brittleness and prone to cracking are solved, the anti-cracking performance and toughness of the material under the deformation load are remarkably improved, meanwhile, the problem that the surface of the concrete is prone to corrosion damage is effectively solved, the durability of the material in the complex environment is improved, and the service life of the material in the complex environment is prolonged.

Description

Technical Field

[0001] This invention relates to the field of concrete technology, specifically to a high-ductility anti-corrosion concrete. Background Technology

[0002] Concrete is a general term for engineering composite materials in which aggregates are bound together by cementing materials. The term concrete usually refers to cement concrete, which is made by mixing cement as cementing material, sand and stone as aggregates, and water in a certain proportion. It is widely used in civil engineering.

[0003] In existing technologies, cement paste in concrete forms a rigid skeleton after hardening. There are micropores and weak transition zones at the interface between aggregate and paste. When under tension, stress concentration easily leads to microcracks. There is a lack of effective energy dissipation mechanisms. Once cracks are formed, they propagate rapidly, resulting in poor crack resistance and insufficient toughness of concrete under deformation loads.

[0004] Based on this, the present invention provides a high-ductility anti-corrosion concrete. Summary of the Invention

[0005] The purpose of this invention is to provide a high-ductility anti-corrosion concrete. The high-ductility anti-corrosion concrete prepared by this invention not only has good crack resistance and toughness under deformation load, but also has high durability and service life in complex environments, effectively improving the performance of high-ductility anti-corrosion concrete.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-ductility anti-corrosion concrete, composed of the following raw materials in parts by weight: 100-150 parts fine aggregate, 100-150 parts quartz sand, 100-150 parts 525 cement, 100-150 parts fly ash, 30-50 parts water, 20-30 parts silica fume, 5-10 parts additives, 3-8 parts flame retardant, 3-5 parts ultra-high molecular weight polyethylene fiber, 3-5 parts modified areca nut peel fiber, 1-3 parts water-reducing agent, 1-3 parts areca nut pulp polysaccharide colloid, and 1-3 parts nano-reinforcing agent.

[0007] The preparation method of the modified areca peel fiber, areca pulp polysaccharide colloid, and nano-reinforcing agent is as follows: waste areca fruit is used as raw material for the modified areca peel fiber, areca pulp polysaccharide colloid, and nano-reinforcing agent. The waste areca fruit is pretreated to obtain peel raw material, pulp raw material and hard kernel raw material. The peel raw material, pulp raw material and hard kernel raw material are processed separately to obtain modified areca peel fiber, areca pulp polysaccharide colloid, and nano-reinforcing agent.

[0008] Preferably, the fine aggregate can be any one or an equal mixture of manufactured sand or river sand with a particle size of 0.15-4.75 mm and a mud content of ≤1%, the quartz sand has a particle size of 40-100 mesh, the water-reducing agent is a polycarboxylate water-reducing agent, and the silica fume has a silica content of ≥95%.

[0009] Preferably, the nano-reinforcing agent is nano-silica, and the ultra-high molecular weight polyethylene fiber is 3-6 mm in length.

[0010] Preferably, the pretreatment method for the waste areca nuts is as follows: moldy waste areca nuts are collected from an areca nut processing plant as raw materials. After removing impurities, the peel, pulp, and pit are separated. The peel, pulp, and pit are put into a drum-type washing machine, deionized water is injected, and the solid-liquid ratio is set to 1:5 and the stirring speed is 30-50 rpm. The machine is washed continuously for 3-5 times, each time for 8-10 minutes. After washing, the machine is transferred to a steam sterilizer and sterilized at 50-70℃ for 30-50 minutes. Then, it is transferred to an oven and dried at 50-60℃ for 1-2 hours to obtain the peel raw material, pulp raw material, and pit raw material for later use.

[0011] Preferably, the processing method of the fruit peel raw material is as follows: the fruit peel raw material is crushed to a particle size ≤5mm and then added to a water bath. A 5% sodium hydroxide solution with a mass concentration is added at a solid-liquid ratio of 1:(8-10). The mixture is stirred at 75-85℃ and 20-30rpm for 2-3 hours. The resulting product is filtered and the first filter residue is taken. The first filter residue is washed with water until neutral to obtain lignin-free fruit peel fiber. The lignin-free fiber is then mixed with a coupling agent solution at a solid-liquid ratio of 1:10 and stirred for 30-50 minutes at a stirring speed of 30-50rpm. After centrifugation, the second filter residue is taken and dried at 50-60℃ until the moisture content is ≤10% to obtain modified areca nut fruit peel fiber. The coupling agent solution is prepared by KH-550, deionized water and ethanol at a mass ratio of 1:5:45.

[0012] Preferably, the processing method of the fruit pulp raw material is as follows: the fruit pulp raw material and deionized water are mixed at a mass ratio of 1:(8-10), and after reflux extraction at 70-80℃ for 3-4 hours, the residue is filtered off to obtain a polysaccharide extract. The polysaccharide extract is concentrated under vacuum of -0.08MPa and temperature of 45-55℃ until the solid content is ≤20%, which is the areca nut pulp polysaccharide colloid.

[0013] Preferably, the flame retardant is prepared by mixing zinc borate and magnesium hydroxide at a mass ratio of 1:(2-3) and adding deionized water to form a suspension with a solid content of 20-30%. The suspension is then processed by a centrifugal spray drying tower with an inlet air temperature of 180-220℃ and an outlet air temperature of 80-100℃ to obtain porous microspheres. The porous microspheres are then mixed with silica sol at a mass ratio of 1:(1-2), dried, and calcined at 300-400℃ for 1-2 hours to form a nano-silica coating layer on the surface of the porous microspheres, which is the flame retardant.

[0014] Preferably, the additive is prepared by: selecting styrene-acrylic emulsion and nano-silica at a mass ratio of 1:(2-4) and performing high-speed shearing at 9000-10000 rpm for 5-7 min to obtain the additive, wherein the nano-silica particle size is 25-35 nm.

[0015] Preferably, the processing method of the hard core raw material is as follows: the hard core raw material is crushed to a particle size of 3-5 mm, calcined at 600-650℃ for 1-2 h, and then ball-milled to D50=5 μm to obtain areca nut shell biochar powder. The areca nut shell biochar powder is mixed with 5% nano titanium dioxide hydrosol at a mass ratio of 1:1, and then 0.5% sodium dodecyl sulfate by mass of the areca nut shell biochar powder is added. The mixture is stirred at 50-80 rpm for 30-40 min to obtain a surface enhancement liquid.

[0016] Preferably, a method for preparing high-ductility anti-corrosion concrete includes the following steps:

[0017] S1: Aggregate pretreatment: Weigh out fine aggregate and quartz sand as needed, dry them in a forced-air drying oven at 100-110℃ to constant weight, and then cool them to 50-60℃ and keep them warm to obtain mixed aggregate.

[0018] S2: Dry mix. Weigh out 525 cement, fly ash, silica fume, mixed aggregates, and nano-reinforcing agent as needed and add them to the mixer. Mix at a speed of 30-40 rpm for 3-5 minutes to obtain a dry mix.

[0019] S3: Wet mixing. Weigh out water, water-reducing agent, and areca nut pulp polysaccharide colloid as needed and add them to the mixer in S2. Adjust the mixing speed to 50-60 rpm and continue mixing for 5-8 minutes to obtain a uniform slurry.

[0020] S4: Fiber dispersion. Weigh out ultra-high molecular weight polyethylene fiber, modified areca nut peel fiber, additives, and flame retardant as needed and add them to the mixer in S2. Adjust the stirring speed to 80-90 rpm and continue stirring for 3-5 minutes to obtain the mixture.

[0021] S5: Molding and curing. The mixture is poured into the mold and vibrated on a vibrating table with an amplitude of 0.3-0.5 mm and a vibration time of 20-30 seconds to complete the vibration molding. After standard curing for 7 days at a temperature of 18-22℃ and a humidity of ≥95%, it is demolded and then naturally cured for 21 days to obtain high ductility anti-corrosion concrete.

[0022] S6: Surface treatment. After the concrete has been cured for 28 days, a surface strengthening liquid is sprayed onto the concrete surface using an airless spraying device at a pressure of 0.3-0.5MPa, with a dosage of 200-300g / ㎡. After standing for 24 hours, a film layer is formed on the concrete surface.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. In this invention, after alkali treatment and modification with a silane coupling agent, the modified areca nut peel fiber exposes active groups such as hydroxyl and aldehyde groups on its surface. These groups form a strong interfacial bond with cement hydration products through hydrogen bonds and chemical bonds, bridging cracks and transferring loads in a three-dimensional network structure, thus inhibiting the propagation of macroscopic cracks. The polysaccharide colloid is adsorbed onto the aggregate surface through polar groups on the linear polymer chain, forming a flexible buffer film. This film improves fiber dispersibility through steric hindrance and absorbs energy from interfacial microcracks through molecular chain segment deformation, reducing stress concentration. The two work together to form a rigid skeleton that physically blocks cracks and a flexible film that chemically dissipates energy, creating a rigid-flexible coupling effect. This constructs a cross-scale ductility enhancement system, solving the problem of high brittleness and easy cracking in traditional concrete, and significantly improving the crack resistance and toughness of the material under deformation loads.

[0025] 2. In this invention, the surface-enhancing liquid prepared from areca nut raw materials forms a coating material with a special structure through high-temperature calcination and composite dispersion of the hard core. The calcined hard core product has a porous structure that can adsorb other functional components. After being mixed with a specific sol, it is sprayed onto the concrete surface and can quickly penetrate to form a continuous composite film. This film can reduce the penetration of external salt and acid corrosive media into the concrete through physical barrier, and can also fill pores and enhance surface density, effectively solving the problem of easy corrosion damage to the concrete surface and improving the durability and service life of the material in complex environments.

[0026] 3. In this invention, modified areca peel fiber, areca pulp polysaccharide colloid, and surface reinforcing liquid are prepared from waste moldy areca nuts to create a multi-scale synergistic raw material that can be processed through fibers, colloids, and coatings. This solves the problem of areca nuts being prone to mold and difficult to handle after mold growth. It not only transforms waste areca nuts from an environmental burden into building material components with both physical reinforcement and chemical protection functions, but also systematically improves the high ductility and corrosion resistance of concrete, providing an innovative path for the recycling of waste biomass and the development of green building materials. Attached Figure Description

[0027] Figure 1 A flowchart for the preparation of high-ductility anti-corrosion concrete is proposed for the invention.

[0028] Figure 2 A flowchart for preparing modified areca nut peel fiber for high-ductility anti-corrosion concrete is proposed for the invention. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1: A high-ductility anti-corrosion concrete, composed of the following raw materials in parts by weight: 100 parts fine aggregate, 100 parts quartz sand, 100 parts 525 cement, 100 parts fly ash, 30 parts water, 20 parts silica fume, 5 parts additives, 3 parts flame retardant, 3 parts ultra-high molecular weight polyethylene fiber, 3 parts modified areca nut peel fiber, 1 part water-reducing agent, 1 part areca nut pulp polysaccharide colloid, and 1 part nano-reinforcing agent.

[0031] The preparation method of modified areca peel fiber, areca pulp polysaccharide colloid, and nano-reinforcing agent is as follows: waste areca fruit is used as raw material. The waste areca fruit is pretreated to obtain peel raw material, pulp raw material and hard kernel raw material. The peel raw material, pulp raw material and hard kernel raw material are processed separately to obtain modified areca peel fiber, areca pulp polysaccharide colloid and nano-reinforcing agent.

[0032] Fine aggregates are selected from manufactured sand with a particle size of 0.15mm and a mud content of ≤1%, quartz sand with a particle size of 40 mesh, water-reducing agent is polycarboxylate water-reducing agent, and silica content in silica fume is ≥95%.

[0033] The nano-reinforcing agent is nano-silica, and the ultra-high molecular weight polyethylene fiber is 3mm in length.

[0034] The pretreatment method for waste areca nuts is as follows: Moldy waste areca nuts are collected from areca nut processing plants as raw materials. After removing impurities, the peel, pulp, and pit are separated. The peel, pulp, and pit are put into a drum washing machine, deionized water is injected, and the solid-liquid ratio is set to 1:5 and the stirring speed is 30 rpm. The washing is carried out 3 times for 8 minutes each time. After washing, the shells are transferred to a steam sterilizer and sterilized at 50℃ for 30 minutes. Then, they are transferred to an oven and dried at 50℃ for 1 hour to obtain the peel raw material, pulp raw material, and pit raw material for later use.

[0035] The processing method of the fruit peel raw material is as follows: the fruit peel raw material is crushed to a particle size ≤5mm and then added to a water bath. A 5% sodium hydroxide solution with a mass concentration of 1% is added at a solid-liquid ratio of 1:8. The mixture is stirred at 75℃ and 20rpm for 2 hours. The resulting product is filtered and the first filter residue is taken. The first filter residue is washed with water until neutral to obtain lignin-free fruit peel fiber. The lignin-free fiber is then mixed with a coupling agent solution at a solid-liquid ratio of 1:10 and stirred for 30 minutes at a stirring speed of 30rpm. After centrifugation, the second filter residue is taken and dried at 50℃ until the moisture content is ≤10% to obtain modified areca peel fiber. The coupling agent solution is prepared by KH-550, deionized water and ethanol at a mass ratio of 1:5:45.

[0036] The processing method of the fruit pulp raw material is as follows: mix the fruit pulp raw material and deionized water at a mass ratio of 1:8, extract by reflux at 70℃ for 3 hours, filter and discard the residue to obtain polysaccharide extract, concentrate the polysaccharide extract under vacuum of -0.08MPa and temperature of 45℃ until the solid content is ≤20%, which is the areca pulp polysaccharide colloid.

[0037] The flame retardant is prepared by mixing zinc borate and magnesium hydroxide at a mass ratio of 1:2 and adding deionized water to form a suspension with a solid content of 20%. The suspension is then processed in a centrifugal spray drying tower with an inlet air temperature of 180°C and an outlet air temperature of 80°C to obtain porous microspheres. The porous microspheres are then mixed with silica sol at a mass ratio of 1:1, dried, and calcined at 300°C for 1 hour to form a nano-silica coating layer on the surface of the porous microspheres, which is the flame retardant.

[0038] The additive is prepared by mixing styrene-acrylic emulsion and nano-silica at a mass ratio of 1:2 and then shearing them at 9000 rpm for 5 min. The nano-silica has a particle size of 25 nm.

[0039] The processing method of the hard core raw material is as follows: the hard core raw material is crushed to a particle size of 3mm, calcined at 600℃ for 12h, and then ball-milled to D50=5μm to obtain areca nut shell biochar powder. The areca nut shell biochar powder is mixed with 5% nano titanium dioxide hydrosol at a mass ratio of 1:1, and then 0.5% sodium dodecyl sulfate by mass of areca nut shell biochar powder is added. The mixture is stirred at 50rpm for 30min to obtain the surface enhancement liquid.

[0040] A method for preparing high-ductility anti-corrosion concrete includes the following steps:

[0041] S1: Aggregate pretreatment: Weigh out fine aggregate and quartz sand as needed, dry them in a forced-air drying oven at 100℃ to constant weight, and then cool them to 50℃ and keep them warm to obtain mixed aggregate;

[0042] S2: Dry mix. Weigh out 525 cement, fly ash, silica fume, mixed aggregate, and nano-reinforcing agent as needed and add them to the mixer. Mix at 30 rpm for 3 minutes to obtain dry mix.

[0043] S3: Wet mixing. Weigh out water, water-reducing agent, and areca nut pulp polysaccharide colloid as needed and add them to the mixer in S2. Adjust the mixing speed to 50 rpm and continue mixing for 5 minutes to obtain a uniform slurry.

[0044] S4: Fiber dispersion. Weigh out ultra-high molecular weight polyethylene fiber, modified areca nut peel fiber, additives, and flame retardant as needed and add them to the mixer in S2. Adjust the stirring speed to 80 rpm and continue stirring for 3 minutes to obtain the mixture.

[0045] S5: Molding and curing. The mixture is poured into the mold and vibrated on a vibrating table with an amplitude of 0.3 mm and a vibration time of 20 seconds to complete the vibration molding. After standard curing for 7 days at a temperature of 18℃ and a humidity of ≥95%, it is demolded and then naturally cured for 21 days to obtain high ductility anti-corrosion concrete.

[0046] S6: Surface treatment. After the concrete has been cured for 28 days, a surface strengthening liquid is sprayed onto the concrete surface at a pressure of 0.3 MPa using an airless spraying device. The dosage is 200 g / ㎡. After standing for 24 hours, a film layer is formed on the concrete surface.

[0047] Example 2: A high-ductility anti-corrosion concrete, composed of the following raw materials in parts by weight: 125 parts fine aggregate, 125 parts quartz sand, 125 parts 525 cement, 125 parts fly ash, 40 parts water, 25 parts silica fume, 8 parts additives, 5 parts flame retardant, 4 parts ultra-high molecular weight polyethylene fiber, 4 parts modified areca nut peel fiber, 2 parts water-reducing agent, 2 parts areca nut pulp polysaccharide colloid, and 2 parts nano-reinforcing agent.

[0048] The preparation method of modified areca peel fiber, areca pulp polysaccharide colloid, and nano-reinforcing agent is as follows: waste areca fruit is used as raw material. The waste areca fruit is pretreated to obtain peel raw material, pulp raw material and hard kernel raw material. The peel raw material, pulp raw material and hard kernel raw material are processed separately to obtain modified areca peel fiber, areca pulp polysaccharide colloid and nano-reinforcing agent.

[0049] Fine aggregates can be manufactured sand with a particle size of 2mm and a mud content of ≤1%, quartz sand with a particle size of 70 mesh, water-reducing agent is polycarboxylate water-reducing agent, and silica content in silica fume is ≥95%.

[0050] The nano-reinforcing agent is nano-silica, and the ultra-high molecular weight polyethylene fiber is 4.5 mm in length.

[0051] The pretreatment method for waste areca nuts is as follows: Moldy waste areca nuts are collected from areca nut processing plants as raw materials. After removing impurities, the peel, pulp, and pit are separated. The peel, pulp, and pit are put into a drum washing machine, deionized water is injected, and the solid-liquid ratio is set to 1:5 and the stirring speed is 40 rpm. The washing is carried out 4 times, 9 minutes each time. After washing, the shells are transferred to a steam sterilizer and sterilized at 60℃ for 40 minutes. Then, they are transferred to an oven and dried at 55℃ for 1.5 hours to obtain the peel raw material, pulp raw material, and pit raw material for later use.

[0052] The processing method of the fruit peel raw material is as follows: the fruit peel raw material is crushed to a particle size ≤5mm and then added to a water bath. A 5% sodium hydroxide solution with a mass concentration of 1% is added at a solid-liquid ratio of 1:9. The mixture is stirred at 80℃ and 25rpm for 2.5h. The resulting product is filtered and the first filter residue is taken. The first filter residue is washed with water until neutral to obtain lignin-free fruit peel fiber. The lignin-free fiber is then mixed with a coupling agent solution at a solid-liquid ratio of 1:10 and stirred for 40min at a stirring speed of 40rpm. After centrifugation, the second filter residue is taken and dried at 55℃ until the moisture content is ≤10% to obtain modified areca nut fruit peel fiber. The coupling agent solution is prepared by KH-550, deionized water and ethanol at a mass ratio of 1:5:45.

[0053] The processing method of the fruit pulp raw material is as follows: mix the fruit pulp raw material and deionized water at a mass ratio of 1:9, reflux extract at 75℃ for 3.5h, filter and discard the residue to obtain polysaccharide extract, concentrate the polysaccharide extract under vacuum of -0.08MPa and temperature of 50℃ until the solid content is ≤20%, which is the areca pulp polysaccharide colloid.

[0054] The flame retardant is prepared by mixing zinc borate and magnesium hydroxide at a mass ratio of 1:2.5 and adding deionized water to form a suspension with a solid content of 25%. The suspension is then processed in a centrifugal spray drying tower with an inlet air temperature of 200℃ and an outlet air temperature of 90℃ to obtain porous microspheres. The porous microspheres are then mixed with silica sol at a mass ratio of 1:1.5, dried, and calcined at 350℃ for 1.5 hours to form a nano-silica coating layer on the surface of the porous microspheres, which is the flame retardant.

[0055] The additive is prepared by mixing styrene-acrylic emulsion and nano-silica at a mass ratio of 1:3 and then shearing them at 9500 rpm for 6 minutes to obtain the additive, wherein the nano-silica has a particle size of 30 nm.

[0056] The processing method of the hard core raw material is as follows: the hard core raw material is crushed to a particle size of 4mm, calcined at 625℃ for 1.5h, and then ball-milled to D50=5μm to obtain areca nut shell biochar powder. The areca nut shell biochar powder is mixed with 5% nano titanium dioxide hydrosol at a mass ratio of 1:1, and then 0.5% sodium dodecyl sulfate by mass of areca nut shell biochar powder is added. The mixture is stirred at 65rpm for 35min to obtain the surface enhancement liquid.

[0057] A method for preparing high-ductility anti-corrosion concrete includes the following steps:

[0058] S1: Aggregate pretreatment: Weigh out fine aggregate and quartz sand as needed, dry them in a forced-air drying oven at 105℃ to constant weight, and then cool them to 55℃ and keep them warm to obtain mixed aggregate.

[0059] S2: Dry mix. Weigh out 525 cement, fly ash, silica fume, mixed aggregates, and nano-reinforcing agent as needed and add them to the mixer. Mix at 35 rpm for 4 minutes to obtain the dry mix.

[0060] S3: Wet mixing. Weigh out water, water-reducing agent, and areca nut pulp polysaccharide colloid as needed and add them to the mixer in S2. Adjust the mixing speed to 55 rpm and continue mixing for 6.5 minutes to obtain a uniform slurry.

[0061] S4: Fiber dispersion. Weigh out ultra-high molecular weight polyethylene fiber, modified areca nut peel fiber, additives, and flame retardant as needed and add them to the mixer of S2. Adjust the stirring speed to 85 rpm and continue stirring for 4 minutes to obtain the mixture.

[0062] S5: Molding and curing. The mixture is poured into the mold and vibrated on a vibrating table with an amplitude of 0.4 mm and a vibration time of 25 s to complete the vibration molding. After standard curing for 7 days under the conditions of temperature 20℃ and humidity ≥95%, it is demolded and then naturally cured for 21 days to obtain high ductility anti-corrosion concrete.

[0063] S6: Surface treatment. After the concrete has been cured for 28 days, a surface strengthening liquid is sprayed onto the concrete surface at a pressure of 0.4 MPa using an airless spraying device. The dosage is 250 g / ㎡. After standing for 24 hours, a film layer is formed on the concrete surface.

[0064] Example 3: A high-ductility anti-corrosion concrete, composed of the following raw materials in parts by weight: 150 parts fine aggregate, 150 parts quartz sand, 150 parts 525 cement, 150 parts fly ash, 50 parts water, 30 parts silica fume, 10 parts additives, 8 parts flame retardant, 5 parts ultra-high molecular weight polyethylene fiber, 5 parts modified areca nut peel fiber, 3 parts water-reducing agent, 3 parts areca nut pulp polysaccharide colloid, and 3 parts nano-reinforcing agent.

[0065] The preparation method of modified areca peel fiber, areca pulp polysaccharide colloid, and nano-reinforcing agent is as follows: waste areca fruit is used as raw material. The waste areca fruit is pretreated to obtain peel raw material, pulp raw material and hard kernel raw material. The peel raw material, pulp raw material and hard kernel raw material are processed separately to obtain modified areca peel fiber, areca pulp polysaccharide colloid and nano-reinforcing agent.

[0066] Fine aggregates can be selected from river sand with a particle size of 4.75mm and a mud content of ≤1%, quartz sand with a particle size of 100 mesh, water-reducing agent is polycarboxylate water-reducing agent, and silica content in silica fume is ≥95%.

[0067] The nano-reinforcing agent is nano-silica, and the ultra-high molecular weight polyethylene fiber is 6mm in length.

[0068] The pretreatment method for waste areca nuts is as follows: Moldy waste areca nuts are collected from areca nut processing plants as raw materials. After removing impurities, the peel, pulp, and pit are separated. The peel, pulp, and pit are put into a drum washing machine, deionized water is injected, and the solid-liquid ratio is set to 1:5 and the stirring speed is 50 rpm. The washing is carried out 5 times for 10 minutes each time. After washing, the shells are transferred to a steam sterilizer and sterilized at 70℃ for 50 minutes. Then, they are transferred to an oven and dried at 60℃ for 2 hours to obtain peel raw materials, pulp raw materials, and pit raw materials for later use.

[0069] The processing method of the fruit peel raw material is as follows: the fruit peel raw material is crushed to a particle size ≤5mm and then added to a water bath. A 5% sodium hydroxide solution with a mass concentration of 1:10 is added at a solid-liquid ratio of 1:10. The mixture is stirred at 85℃ and 30rpm for 3 hours. The resulting product is filtered and the first filter residue is taken. The first filter residue is washed with water until neutral to obtain lignin-free fruit peel fiber. The lignin-free fiber is then mixed with a coupling agent solution at a solid-liquid ratio of 1:10 and stirred for 50 minutes at a stirring speed of 50rpm. After centrifugation, the second filter residue is taken and dried at 60℃ until the moisture content is ≤10% to obtain modified areca peel fiber. The coupling agent solution is prepared by KH-550, deionized water and ethanol at a mass ratio of 1:5:45.

[0070] The processing method of the fruit pulp raw material is as follows: mix the fruit pulp raw material and deionized water at a mass ratio of 1:10, extract by reflux at 80℃ for 4 hours, filter and discard the residue to obtain polysaccharide extract, concentrate the polysaccharide extract under vacuum of -0.08MPa and temperature of 55℃ until the solid content is ≤20%, which is the areca pulp polysaccharide colloid.

[0071] The flame retardant is prepared by mixing zinc borate and magnesium hydroxide at a mass ratio of 1:3 and adding deionized water to form a suspension with a solid content of 30%. The suspension is then processed in a centrifugal spray drying tower with an inlet air temperature of 220°C and an outlet air temperature of 100°C to obtain porous microspheres. The porous microspheres are then mixed with silica sol at a mass ratio of 1:2, dried, and calcined at 400°C for 2 hours to form a nano-silica coating layer on the surface of the porous microspheres, which is the flame retardant.

[0072] The additive is prepared by mixing styrene-acrylic emulsion and nano-silica at a mass ratio of 1:4 and then shearing them at 10,000 rpm for 7 minutes to obtain the additive, wherein the nano-silica has a particle size of 35 nm.

[0073] The processing method of the hard core raw material is as follows: the hard core raw material is crushed to a particle size of 5mm, calcined at 650℃ for 2h, and then ball-milled to D50=5μm to obtain areca nut shell biochar powder. The areca nut shell biochar powder is mixed with 5% nano titanium dioxide hydrosol at a mass ratio of 1:1, and then 0.5% sodium dodecyl sulfate by mass of areca nut shell biochar powder is added. The mixture is stirred at 80rpm for 40min to obtain the surface enhancement liquid.

[0074] A method for preparing high-ductility anti-corrosion concrete includes the following steps:

[0075] S1: Aggregate pretreatment: Weigh out fine aggregate and quartz sand as needed, dry them in a forced-air drying oven at 110℃ to constant weight, and then cool them to 60℃ and keep them warm to obtain mixed aggregate;

[0076] S2: Dry mix. Weigh out 525 cement, fly ash, silica fume, mixed aggregate, and nano-reinforcing agent as needed and add them to the mixer. Mix at 40 rpm for 5 minutes to obtain dry mix.

[0077] S3: Wet mixing. Weigh out water, water-reducing agent, and areca nut pulp polysaccharide colloid as needed and add them to the mixer in S2. Adjust the mixing speed to 60 rpm and continue mixing for 8 minutes to obtain a uniform slurry.

[0078] S4: Fiber dispersion. Weigh out ultra-high molecular weight polyethylene fiber, modified areca nut peel fiber, additives, and flame retardant as needed and add them to the mixer of S2. Adjust the stirring speed to 90 rpm and continue stirring for 5 minutes to obtain the mixture.

[0079] S5: Molding and curing. The mixture is poured into the mold and vibrated on a vibrating table with an amplitude of 0.5 mm and a vibration time of 30 seconds to complete the vibration molding. After standard curing for 7 days at a temperature of 22℃ and a humidity of ≥95%, it is demolded and then naturally cured for 21 days to obtain high ductility anti-corrosion concrete.

[0080] S6: Surface treatment. After the concrete has been cured for 28 days, a surface strengthening liquid is sprayed onto the concrete surface at a pressure of 0.5 MPa using an airless spraying device. The dosage is 300 g / ㎡. After standing for 24 hours, a film layer is formed on the concrete surface.

[0081] Comparative Example 1: The difference between this comparative example and Experiment 1 is as follows:

[0082] This comparative example does not contain modified areca nut peel fiber.

[0083] Comparative Example 2: The difference between this comparative example and Experiment 1 is as follows:

[0084] This comparative example does not contain areca nut pulp polysaccharide colloid.

[0085] Comparative Example 3: The difference between this comparative example and Experiment 1 is that:

[0086] This comparative example does not contain modified areca nut peel fiber or areca nut pulp polysaccharide colloid.

[0087] Comparative Example 4: The difference between this comparative example and Experiment 1 is as follows:

[0088] In this comparative example, the concrete is not surface-treated.

[0089] Performance testing: Performance tests were conducted on the high-ductility anti-corrosion concrete of Examples 1-3 and Comparative Examples 1-4.

[0090] Elongation performance test: The concrete was tested according to the test methods in GB / T 50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete";

[0091] Corrosion resistance test: The test shall be conducted in accordance with the test methods in GB / T 50476-2008 "Standard for Durability Design of Concrete Structures".

[0092] The obtained test data is recorded in the table below:

[0093]

[0094] Analysis of the data in the comparison table shows that the elongation of the concrete prepared in Comparative Examples 1-4 is lower than that in Examples 1-3, indicating that the concrete has poor crack resistance and toughness under deformation load. At the same time, the corrosion rate of the concrete prepared in Comparative Examples 1-4 is higher than that in Examples 1-3, indicating that the concrete has poor durability and service life in complex environments. In particular, the elongation of the concrete prepared in Comparative Examples 1-3 without modified areca peel fiber and areca pulp polysaccharide colloid decreases significantly, while the corrosion rate of the concrete in Comparative Example 4 is significantly increased because the concrete was not treated with a surface-reinforcing liquid prepared from areca hard kernel raw material.

[0095] This indicates that after alkali treatment and modification with silane coupling agents, the modified areca nut peel fiber exposes active groups such as hydroxyl and aldehyde groups on its surface. These groups form a strong interfacial bond with cement hydration products through hydrogen bonds and chemical bonds, bridging cracks and transferring loads in a three-dimensional network structure, thus inhibiting the propagation of macroscopic cracks. The polysaccharide colloid is adsorbed onto the aggregate surface through polar groups on the linear polymer chain, forming a flexible buffer film. This film improves fiber dispersibility through steric hindrance and absorbs energy from interfacial microcracks through molecular chain segment deformation, reducing stress concentration. The two work together to form a rigid skeleton that physically blocks cracks and a flexible film that chemically dissipates energy, creating a rigid-flexible coupling effect. This constructs a cross-scale ductility enhancement system. Combined with ultra-high molecular weight polyethylene fibers that hold the crack area like an invisible wire mesh, this solves the problem of high brittleness and easy cracking in traditional concrete, significantly improving the crack resistance and toughness of the material under deformation loads.

[0096] The surface-enhancing liquid prepared from areca nut raw materials forms a coating material with a special structure through high-temperature calcination and composite dispersion of the hard core. The calcined hard core product has a porous structure that can adsorb other functional components. When mixed with a specific sol and sprayed onto the concrete surface, it can quickly penetrate and form a continuous composite film. This film can reduce the penetration of external salt and acid corrosive media into the concrete through physical barrier, and can also fill pores and enhance surface density, effectively solving the problem of easy corrosion of concrete surfaces and improving the durability and service life of the material in complex environments.

[0097] By comparing and analyzing the relevant data in the table, it can be seen that the high-ductility anti-corrosion concrete prepared by this invention not only exhibits good crack resistance and toughness under deformation loads, but also high durability and service life in complex environments. This indicates that the high-ductility anti-corrosion concrete provided by this invention has a broader market prospect and is more suitable for widespread application.

[0098] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0099] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-ductility corrosion-resistant concrete, characterized by: The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent. The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent.

2. The high-ductility corrosion-resistant concrete according to claim 1, wherein The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent.

3. The high-ductility corrosion-resistant concrete according to claim 1, wherein The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent.

4. The high-ductility corrosion-resistant concrete according to claim 1, wherein The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent.

5. The high-ductility corrosion-resistant concrete according to claim 4, wherein The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent.

6. The high-ductility corrosion-resistant concrete according to claim 4, wherein The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent. The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent. The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent. The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent. The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent. The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent. The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent. The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent. The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent. The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent. The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent. The application discloses a preparation method of the modified areca peel fiber, the areca pulp polysaccharide colloid and the nano reinforcing agent. 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The high-ductility corrosion-resistant concrete according to claim 1, wherein The flame retardant is prepared by mixing zinc borate and magnesium hydroxide at a mass ratio of 1:(2-3) and adding deionized water to form a suspension with a solid content of 20-30%. The suspension is then processed by a centrifugal spray drying tower with an inlet air temperature of 180-220℃ and an outlet air temperature of 80-100℃ to obtain porous microspheres. The porous microspheres are then mixed with silica sol at a mass ratio of 1:(1-2), dried, and calcined at 300-400℃ for 1-2 hours to form a nano-silica coating layer on the surface of the porous microspheres, which is the flame retardant.

8. The high-ductility corrosion-resistant concrete according to claim 1, wherein The additive is prepared by selecting styrene-acrylic emulsion and nano-silica at a mass ratio of 1:(2-4) and then performing high-speed shearing at 9000-10000 rpm for 5-7 min to obtain the additive, wherein the nano-silica has a particle size of 25-35 nm.

9. The high-ductility corrosion-resistant concrete according to claim 4, wherein The processing method of the hard core raw material is as follows: the hard core raw material is crushed to a particle size of 3-5 mm, calcined at 600-650℃ for 1-2 h, and then ball-milled to D50=5 μm to obtain areca nut shell biochar powder. The areca nut shell biochar powder is mixed with 5% nano titanium dioxide hydrosol at a mass ratio of 1:1, and then 0.5% sodium dodecyl sulfate by mass of areca nut shell biochar powder is added. The mixture is stirred at 50-80 rpm for 30-40 min to obtain a surface enhancement liquid.

10. A method of producing a high-ductility corrosion-resistant concrete, characterized by, The high-ductility anti-corrosion concrete used according to any one of claims 1-9 includes the following steps: S1: Aggregate pretreatment: Weigh out fine aggregate and quartz sand as needed, dry them in a forced-air drying oven at 100-110℃ to constant weight, and then cool them to 50-60℃ and keep them warm to obtain mixed aggregate. S2: Dry mix. Weigh out 525 cement, fly ash, silica fume, mixed aggregates, and nano-reinforcing agent as needed and add them to the mixer. Mix at a speed of 30-40 rpm for 3-5 minutes to obtain a dry mix. S3: Wet mixing. Weigh out water, water-reducing agent, and areca nut pulp polysaccharide colloid as needed and add them to the mixer in S2. Adjust the mixing speed to 50-60 rpm and continue mixing for 5-8 minutes to obtain a uniform slurry. S4: Fiber dispersion. Weigh out ultra-high molecular weight polyethylene fiber, modified areca nut peel fiber, additives, and flame retardant as needed and add them to the mixer in S2. Adjust the stirring speed to 80-90 rpm and continue stirring for 3-5 minutes to obtain the mixture. S5: Molding and curing. The mixture is poured into the mold and vibrated on a vibrating table with an amplitude of 0.3-0.5 mm and a vibration time of 20-30 seconds to complete the vibration molding. After standard curing for 7 days at a temperature of 18-22℃ and a humidity of ≥95%, it is demolded and then naturally cured for 21 days to obtain high ductility anti-corrosion concrete. S6: Surface treatment. After the concrete has been cured for 28 days, a surface strengthening liquid is sprayed onto the concrete surface using an airless spraying device at a pressure of 0.3-0.5MPa, with a dosage of 200-300g / ㎡. After standing for 24 hours, a film layer is formed on the concrete surface.

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