CN111087214A - High-strength anti-corrosion concrete and preparation process thereof - Google Patents
High-strength anti-corrosion concrete and preparation process thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5007—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with salts or salty compositions, e.g. for salt glazing
- C04B41/5015—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with salts or salty compositions, e.g. for salt glazing containing phosphorus in the anion, e.g. phosphates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
- C04B41/67—Phosphates
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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Abstract
The invention relates to high-strength anti-corrosion concrete and a preparation process thereof, relating to the technical field of concrete preparation and comprising the following raw materials in parts by weight: 180 portions of ordinary Portland cement; coarse aggregate 1180 plus 1220 parts; 600 portions and 640 portions of fine aggregate; 200 portions and 240 portions of active admixture; 6-10 parts of a polycarboxylic acid water reducing agent; 8-12 parts of a preservative; 4-8 parts of a slow-release alkaline agent; water 180 and 200 portions. By adding the preservative, the steel bar is prevented from being corroded, so that the degradation and the failure of the performance of the concrete structure are slowed down, and the strength of the concrete is improved.
Description
Technical Field
The invention relates to the technical field of concrete preparation, in particular to high-strength anticorrosive concrete and a preparation process thereof.
Background
With the progress of society and the improvement of living standard of people, various types of high-rise buildings rush to people's lives like bamboo shoots in the spring after rain, and the use of reinforced concrete is not reduced in the construction process of the high-rise buildings, the reinforced concrete is the most used building material at present, and is a combined material which is formed by adding reinforcing meshes, steel plates or fibers into concrete and works together with the reinforced mesh, the steel plates or the fibers to improve the mechanical property of the concrete. The reinforcing mesh, the steel plate or the fiber is used for bearing tensile stress and shearing stress, and the quality of the performance of the reinforcing mesh, the steel plate or the fiber directly influences the quality of the construction engineering.
In recent years, the concrete structure performance degradation and premature failure caused by the steel bar corrosion bring huge economic loss and harm to the modern society, and the problems of personal safety, effective utilization of resources, environmental protection and the like are related, even negative impact is brought to the society, and the concrete structure performance degradation and premature failure are serious problems which are urgently needed to be solved by countries in the world at present.
Disclosure of Invention
The invention aims to provide high-strength antirust concrete and a preparation process thereof.
The above object of the present invention is achieved by the following technical solutions:
the high-strength anticorrosive concrete comprises the following raw materials in parts by weight:
by adopting the technical scheme, the preservative is added to prevent the reinforcing steel bar from being corroded, so that the degradation and failure of the performance of the concrete structure are slowed down, and the strength of the concrete is improved. By adding the active admixture, the curing effect of the concrete on chloride ions is improved, so that the anti-corrosion capability of the steel bar is improved, the degradation and failure of the concrete structure performance are slowed down, and the strength of the concrete is improved. The slow-release alkaline agent is added, so that hydroxide radicals in the concrete can be slowly released to stabilize the pH value in a concrete layer and improve the anti-carbonization effect of the concrete, thereby improving the anti-corrosion capability of the reinforcing steel bar, slowing down the degradation and failure of the performance of the concrete structure and improving the strength of the concrete. Ordinary portland cement, coarse aggregate, fine aggregate and polycarboxylic acid water reducing agent are all common raw materials in concrete preparation. The water is from a source common in the local, such as river or tap water.
The invention is further configured to: the preservative is prepared from the following raw materials in percentage by weight:
by adopting the technical scheme, the PVP/graphene composite material is prepared by adopting the method of high adsorption of chloride ions by the PVP/graphene composite material and the adsorption mechanism, and the stable PVP chemically modified graphene aqueous solution is obtained. The concrete can adsorb free chloride ions in the concrete, so that the anti-corrosion capability of the steel bar is improved, the degradation and failure of the performance of the concrete structure are slowed down, and the strength of the concrete is improved.
The dodecyl benzene sulfonic acid triethanolamine ester is a cationic surfactant, and after cement is hydrated, free cations such as calcium ions, magnesium ions, sodium ions and the like in a pore solution enable the surfaces of pores and the surfaces of C-S-H gels to be negatively charged, after the cationic surfactant is adsorbed to the surfaces of hydration products, the zeta potential of the cationic surfactant can be changed from negative to positive, the surfaces of the hydration products are stronger in positive electricity, and more free chloride ions can be adsorbed through electrostatic action, so that the physical adsorption capacity is enhanced.
The zinc oxide can consume OH in the cathode region-Causing Fe produced in the anode region2+Can not be converted into Fe (OH) rapidly and sufficiently2And Fe (OH)3Precipitated and Zn (OH)2With free Ca in the concrete2+Ca (Zn (OH)) produced3)2·2H2O can passivate the reinforcing steel bars again, reduce the porosity of the concrete, prevent harmful ions from entering the concrete and delay the corrosion of the reinforcing steel bars.
Sodium monofluorophosphate contains PO3F2 -Can react with Ca (OH)2The reaction is carried out to generate apatite, a compact barrier layer is formed on the surface of the steel bar in a physical precipitation way to prevent the steel bar from being corroded,the anti-corrosion effect of the concrete is improved.
Because the PVP/graphene composite material has a surface area and a porous structure which are larger than the external surface area, the triethanolamine dodecylbenzene sulfonate, the zinc oxide, the sodium monofluorophosphate and the sodium carbonate can be adsorbed inside, so that the PVP/graphene composite material is electropositive, the adsorption effect of the PVP/graphene composite material, the zinc oxide, the sodium monofluorophosphate and the sodium carbonate on the surface of a hydration product is improved, and the corrosion prevention effect of concrete is improved. The PVP/graphene composite material can be used as a dispersing agent, so that the dispersing effect of each raw material in concrete is improved, each raw material can be uniformly dispersed in a concrete mixture, the local corrosion phenomenon caused by nonuniform dispersion of the raw materials is prevented, and the strength and the corrosion prevention effect of the concrete are improved.
The invention is further configured to: the slow-release alkaline agent is prepared from the following raw materials in percentage by weight:
by adopting the technical scheme, the roasted magnesium-aluminum carbonate hydrotalcite is a layered double hydroxide, the pH value is alkaline, and chloride ions can be adsorbed due to the special layered structure, so that the anti-corrosion effect is achieved. And because the roasted magnesium-aluminum carbonate hydrotalcite has negative charges, and the preservative is adsorbed on the surface of the hydration product, the surface of the hydration product has positive charges, so that the adsorption force of the roasted magnesium-aluminum carbonate hydrotalcite on the surface of the hydration product is improved, the bonding strength of the slow-release alkaline agent and concrete is improved, the dispersion effect of the slow-release alkaline agent in the concrete is improved, and the effect of stabilizing the pH value in the concrete layer by the slow-release alkaline agent is improved.
The alkaline regulator is used for providing hydroxide ions, stabilizing the pH value in the concrete layer and improving the anti-carbonization effect of the concrete, thereby improving the anti-corrosion capability of the reinforcing steel bar, slowing down the degradation and failure of the concrete structure performance and improving the strength of the concrete.
The dodecyl glucoside is a nonionic surfactant, and the sodium dodecyl benzene sulfonate is an anionic surfactant and is used for modifying the roasted magnesium-aluminum carbonate hydrotalcite, so that the surface tension of the roasted magnesium-aluminum carbonate hydrotalcite is reduced, and the attachment effect and the bonding strength of an alkaline regulator on the roasted magnesium-aluminum carbonate hydrotalcite are improved. And after the anionic surfactant is adsorbed to the surface of the hydration product, the negative value of the zeta potential of the anionic surfactant can be increased, so that the electrostatic repulsion with chloride ions is enhanced, and the adsorbed chloride ions are reduced. And the anionic surfactant and the chloride ions generate competitive adsorption, so that the chloride ion binding capacity is further weakened. The nonionic surfactant does not adsorb on the surface of the hydration product and therefore has the least influence on the chloride ion adsorption capacity. Mainly, the method reduces the chance that chloride ions are close to and contact the surface of a hydration product, weakens the electrostatic attraction between the chloride ions and the hydration product, and slightly reduces the chloride ion adsorption capacity of the cement slurry.
Gelatin is used as a thickening agent to improve the adhesion effect and the bonding strength of the alkaline regulator on the roasted magnesium-aluminum carbonate hydrotalcite. Meanwhile, the slump of the concrete is improved, and the concrete mixture is endowed with good fluidity, so that the strength of the concrete is improved.
The invention is further configured to: the alkaline regulator comprises the following raw materials in percentage by weight:
by adopting the technical scheme, the calcium hydroxide is used for providing sufficient hydroxide ions and calcium ions. The sodium benzoate and the 2-aminobenzoic acid form a durable passivation layer on the surface of the steel bar, and the rust resistance efficiency is increased along with the prolonging of time. The two agents can protect the reinforcing steel bars, and the compressive strength of the concrete cannot be reduced. The sodium benzoate and the 2-aminobenzoic acid have an antibacterial effect, prevent the concrete from being subjected to microbial corrosion, and improve the anticorrosion effect of the concrete.
The invention is further configured to: the active admixture comprises the following raw materials in percentage by weight:
50-60% of fly ash;
20-30% of granulated blast furnace slag powder;
10-30% of superfine silicon powder.
By adopting the technical scheme, the fly ash, the granulated blast furnace slag powder and the superfine silicon powder can be subjected to secondary hydration, so that Ca (OH) in a system can be absorbed2And more low-alkalinity C-S-H gel is generated, and the C-S-H gel generates stronger adsorption and solidification effects on chloride ions through the adsorption effect of a diffusion double electric layer generated by charges carried on the surfaces of colloidal particles on positive and negative ions in chloride salts due to the huge specific surface area of the C-S-H gel, so that the mixed cement doped with the active admixture has stronger chloride ion solidification capability, and the rust resistance capability of the reinforcing steel bar is improved.
The invention is further configured to: the concrete is coated with a layer of coating material, and the coating material is prepared from the following raw materials in percentage by weight:
by adopting the technical scheme, the waterborne epoxy resin is a commonly used film forming agent and adhesive, and can form a layer of protective film on the surface of a concrete layer through crosslinking and curing under the action of the waterborne epoxy curing agent, so that chloride ions are prevented from invading the interior of the concrete, and the anti-corrosion effect of the concrete is improved.
Vinyl tri (2-methoxyethoxy) silane is a silane coupling agent and is used for modifying water-based epoxy resin and improving the bonding strength between the water-based epoxy resin and a concrete layer, so that the adhesive force of the water-based epoxy resin on the surface of the concrete layer is improved, the surface of a coating is not easy to fall off after being impacted, the protection effect of the coating material on the concrete layer is improved, and the service life of the coating material is prolonged.
Phosphate radicals in the sodium dihydrogen phosphate and the disodium hydrogen phosphate can react with calcium ions liberated from the concrete to generate precipitate and pores of the concrete, so that the pores on the surface of the concrete are blocked and reduced, and external chloride ions are reduced to permeate into the concrete, thereby improving the anticorrosion effect of the concrete. Meanwhile, the pH value in the coating material is stabilized, and the service life of the coating material is prolonged.
Tween-80 is a non-surfactant, and is used for reducing the surface tension among the raw materials, forming uniform and stable emulsion, and improving the film strength and density of the film formed by the coating material, so that the anti-corrosion effect of the film formed by the coating material is improved.
A preparation process of high-strength anti-corrosion concrete comprises the following process steps:
1) uniformly mixing ordinary portland cement, coarse aggregate, fine aggregate, an active admixture, a polycarboxylic acid water reducing agent, a preservative and water according to a proportion, adding a slow-release alkaline agent, and uniformly stirring to obtain a concrete mixture;
2) pouring the concrete mixture prepared in the step 1) on the ground paved with the steel bars, and forming a concrete layer after the concrete mixture is cured;
3): after the concrete layer in the step 2) is initially set, coating the coating material on the surface of the concrete, and drying the concrete layer to obtain the high-strength anti-corrosion concrete.
By adopting the technical scheme, the preservative is added in the step 1) and is uniformly stirred, then the slow-release alkaline agent is added, and the preservative has positive and negative charges, and the slow-release alkaline agent has negative charges, so that when the preservative and the slow-release alkaline agent are added into the concrete mixture together for mixing, the preservative and the slow-release alkaline agent react to agglomerate together, so that the dispersion effect and the combination force of the preservative and the slow-release alkaline agent in the concrete mixture are influenced, and the corrosion prevention effect of the concrete is influenced.
The invention is further configured to: the coating material in the step 3) comprises the following steps when coated on the surface of a concrete layer:
step 1: uniformly stirring all components in the coating material according to a proportion to prepare the coating material;
step 2: firstly, cleaning impurities on the surface of a concrete layer, polishing the surface of the concrete layer after initial setting by using a shot blasting machine to roughen the surface of the concrete layer, and then uniformly coating a coating material on the surface of the concrete layer, wherein the thickness of a coating layer of the coating material is 2-3 mm;
and step 3: and after the concrete layer and the coating material are dried and cured, polishing the surface of the concrete layer to be flat.
By adopting the technical scheme, the surface of the concrete layer after initial setting is polished by the shot blasting machine, so that the surface of the concrete layer becomes rough, the contact area between the concrete layer and the waterborne epoxy resin is increased, the adhesive force of the waterborne epoxy resin on the surface of the concrete layer is improved, the surface of the coating is not easy to fall off after being impacted, and the protection effect and the service life of the coating material on the concrete layer are improved.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the corrosion inhibitor is added to prevent the steel bars from being corroded, so that the degradation and the failure of the performance of the concrete structure are slowed down, and the strength of the concrete is improved;
2. by adding the active admixture, the curing effect of the concrete on chloride ions is improved, so that the anti-corrosion capability of the steel bar is improved, the degradation and failure of the concrete structure performance are slowed down, and the strength of the concrete is improved;
3. the slow-release alkaline agent is added, so that hydroxide radicals in the concrete can be slowly released to stabilize the pH value in a concrete layer and improve the anti-carbonization effect of the concrete, thereby improving the anti-corrosion capability of the steel bar, slowing down the degradation and failure of the performance of the concrete structure and improving the strength of the concrete;
4. through having the one deck coating material at concrete layer surface coating for form the one deck protection film outside concrete layer, inside being used for blockking external chloride ion and invading the concrete, thereby improve the anticorrosive effect of concrete, simultaneously, improve the impact resistance and the intensity of concrete.
Detailed Description
The first embodiment is as follows:
the invention discloses a preparation process of high-strength anticorrosive concrete, which comprises the following process steps:
1) uniformly mixing 190 parts by weight of ordinary portland cement, 1200 parts by weight of coarse aggregate, 620 parts by weight of fine aggregate, 220 parts by weight of active admixture, 8 parts by weight of polycarboxylic acid water reducing agent, 10 parts by weight of preservative and 190 parts by weight of water, adding 6 parts by weight of slow-release alkaline agent, and uniformly stirring to obtain a concrete mixture;
wherein the active admixture comprises the following raw materials in percentage by weight:
55% of fly ash;
25% of granulated blast furnace slag powder;
20% of superfine silicon powder;
the preservative comprises the following preparation steps: uniformly mixing 25% of dodecylbenzene sulfonic acid triethanolamine ester, 15% of zinc oxide, 15% of sodium monofluorophosphate, 25% of PVP/graphene composite material and 20% of deionized water according to weight percentage to prepare the preservative;
the slow-release alkaline agent comprises the following preparation steps: according to the weight percentage, firstly, uniformly mixing 15% of alkaline regulator, 6% of gelatin, 5% of dodecyl glucoside, 4% of sodium dodecyl benzene sulfonate and 35% of deionized water, then adding 35% of roasted magnesium aluminum carbonate hydrotalcite, and uniformly stirring to prepare the slow-release alkaline agent;
the alkaline regulator comprises the following preparation steps: uniformly mixing 35% of calcium hydroxide, 8% of sodium benzoate, 10% of 2-aminobenzoic acid and 47% of deionized water according to weight percentage to prepare an alkaline regulator;
2) pouring the concrete mixture prepared in the step 1) on the ground paved with the steel bars, and forming a concrete layer after the concrete mixture is cured;
3): after the concrete layer in the step 2) is initially set, the following steps are carried out:
step 1: uniformly stirring all components in the coating material according to a proportion to prepare the coating material;
the coating material is prepared from the following raw materials in percentage by weight:
step 2: firstly, cleaning impurities on the surface of a concrete layer, polishing the surface of the concrete layer after initial setting by using a shot blasting machine to roughen the surface of the concrete layer, and then uniformly coating a coating material on the surface of the concrete layer, wherein the thickness of a coating layer of the coating material is 3 mm;
and step 3: and after the concrete layer and the coating material are dried and cured, polishing the surface of the concrete layer to be flat, thus obtaining the high-strength anti-corrosion concrete.
Examples 2 to 5 are different from example 1 in that the high-strength anticorrosive concrete comprises the following raw materials in parts by weight:
examples 6-9 differ from example 1 in that the preservative is prepared from the following raw materials in weight percent:
examples 10 to 13 differ from example 1 in that the slow-release alkaline agent is prepared from the following raw materials in percentage by weight:
examples 14-17 differ from example 1 in that the alkaline modifier comprises the following raw materials in weight percent:
examples 18-21 differ from example 1 in that the active admixture comprises the following raw materials in weight percent:
examples 22-25 differ from example 1 in that the coating material was prepared from the following raw materials in weight percent:
comparative example:
comparative example 1 differs from example 1 in that no preservative is included in the high strength preserved concrete;
comparative example 2 is different from example 1 in that the slow-release alkaline agent is not included in the high-strength anticorrosive concrete;
comparative example 3 differs from example 1 in that the high strength, anti-corrosive concrete does not include an active admixture;
comparative example 4 is different from example 1 in that step 3) is not included in the preparation process of the high-strength anti-corrosive concrete;
comparative example 5 differs from example 1 in step 1) of the process for preparing high strength, corrosion resistant concrete: uniformly mixing ordinary portland cement, coarse aggregate, fine aggregate, active admixture, polycarboxylic acid water reducing agent, preservative, slow-release alkaline agent and water according to a proportion to obtain the concrete mixture.
Test samples: the concrete produced in examples 1 to 5 was selected as test samples 1 to 5, and the concrete produced in comparative examples 1 to 5 was selected as control samples 1 to 5.
1) And (3) corrosion resistance detection: the test samples 1-5 and the comparison samples 1-5 are manufactured into standard test blocks according to GB/T50080-2002 'common concrete mixture performance test method', the standard test blocks are maintained for 28 days, and then the standard test blocks manufactured by the test samples 1-5 and the comparison samples 1-5 are placed into a salt spray box for neutral salt spray test. The test temperature was selected to be 35 ℃. The pH value is adjusted to be in a neutral range (6.5-7.2), and the sedimentation rate of the salt spray is 1-3ml/80cm2H, the sedimentation amount is between 1 and 2ml/80cm2H. The salt spray test time is 72 h. And testing the corrosion degree of the steel bars in the concrete after the salt spray test is finished.
The test results are given in the table below. (wherein the degree of corrosion is 1-10 grades from light to heavy)
2) And (3) testing the strength: and (3) making the test samples 1-5 and the reference samples 1-5 into standard test blocks according to GB/T50080-2002 'common concrete mixture performance test method', adopting a TYE-3000 computer full-automatic concrete press, measuring the standard test blocks for curing for 7d, 14d and 28d at a loading speed of 0.5MPa/s, measuring the compressive strength of the standard test blocks after the corrosion test is carried out after 28 days, and recording the compressive strength.
From the above table, it can be seen that:
1. as can be seen by comparing examples 1-5 with comparative example 1, the corrosion of the steel bars can be slowed down by adding the preservative, so that the degradation and failure of the performance of the concrete structure are slowed down, and the strength of the concrete is improved;
2. as can be seen from comparison between examples 1-5 and comparative example 2, the slow-release alkaline agent is added, so that hydroxide radicals in the concrete can be slowly released to stabilize the pH value in the concrete layer and improve the anti-carbonization effect of the concrete, thereby improving the anti-corrosion capability of the steel bar, slowing down the degradation and failure of the concrete structure performance and improving the strength of the concrete;
3. compared with the comparative example 3, the active admixture is added in the examples 1 to 5, so that the strength of the concrete is mainly improved, but the anti-corrosion capability of the reinforcing steel bar is improved to a certain extent, and the degradation and the failure of the performance of the concrete structure are slowed down;
4. as can be seen from the comparison between examples 1 to 5 and comparative example 4, a layer of protective film can be formed outside the concrete layer by coating a layer of coating material on the surface of the concrete layer, so that external chloride ions are prevented from entering the concrete, the anti-corrosion effect of the concrete is improved, and the impact resistance and the strength of the concrete are improved;
5. as can be seen from comparison between examples 1-5 and comparative example 5, the dispersing effect and the bonding strength of the preservative and the slow-release alkaline agent in the concrete mixture can be improved by adding the preservative in step 1) and stirring uniformly, and then adding the slow-release alkaline agent, so that the preservative effect and the strength of the concrete are slightly improved.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. A high-strength anti-corrosion concrete is characterized in that: the material comprises the following raw materials in parts by weight:
2. the high-strength anti-corrosion concrete according to claim 1, wherein: the preservative is prepared from the following raw materials in percentage by weight:
3. the high-strength anti-corrosion concrete according to claim 1, wherein: the slow-release alkaline agent is prepared from the following raw materials in percentage by weight:
4. the high-strength anti-corrosion concrete according to claim 1, wherein: the alkaline regulator comprises the following raw materials in percentage by weight:
5. the high-strength anti-corrosion concrete according to claim 1, wherein: the active admixture comprises the following raw materials in percentage by weight:
50-60% of fly ash;
20-30% of granulated blast furnace slag powder;
10-30% of superfine silicon powder.
6. The high-strength anti-corrosion concrete according to claim 1, wherein: the concrete is coated with a layer of coating material, and the coating material is prepared from the following raw materials in percentage by weight:
7. a preparation process of high-strength anti-corrosion concrete is characterized by comprising the following steps: the method comprises the following process steps:
1) uniformly mixing ordinary portland cement, coarse aggregate, fine aggregate, an active admixture, a polycarboxylic acid water reducing agent, a preservative and water according to a proportion, adding a slow-release alkaline agent, and uniformly stirring to obtain a concrete mixture;
2) pouring the concrete mixture prepared in the step 1) on the ground paved with the steel bars, and forming a concrete layer after the concrete mixture is cured;
3): after the concrete layer in the step 2) is initially set, coating the coating material on the surface of the concrete, and drying the concrete layer to obtain the high-strength anti-corrosion concrete.
8. The preparation process of the high-strength anti-corrosion concrete according to claim 7, characterized in that: the coating material in the step 3) comprises the following steps when coated on the surface of a concrete layer:
step 1: uniformly stirring all components in the coating material according to a proportion to prepare the coating material;
step 2: firstly, cleaning impurities on the surface of a concrete layer, polishing the surface of the concrete layer after initial setting by using a shot blasting machine to roughen the surface of the concrete layer, and then uniformly coating a coating material on the surface of the concrete layer, wherein the thickness of a coating layer of the coating material is 2-3 mm;
and step 3: and after the concrete layer and the coating material are dried and cured, polishing the surface of the concrete layer to be flat.
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