CN111116135A - Early strength concrete with super-retarding effect and preparation process thereof - Google Patents
Early strength concrete with super-retarding effect and preparation process thereof Download PDFInfo
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- CN111116135A CN111116135A CN201911385076.XA CN201911385076A CN111116135A CN 111116135 A CN111116135 A CN 111116135A CN 201911385076 A CN201911385076 A CN 201911385076A CN 111116135 A CN111116135 A CN 111116135A
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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
- 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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- 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
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/324—Alkali metal phosphate
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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
Abstract
The invention relates to early strength concrete with an ultra-retarding effect 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; 240 portions of active admixture; 6-10 parts of a polycarboxylic acid water reducing agent; 8-12 parts of an ultra retarder; 4-8 parts of an early strength agent; water 180 and 200 portions. By adding the super retarder and the early strength agent, the initial setting time of the concrete is prolonged, and the early strength of the concrete is improved.
Description
Technical Field
The invention relates to the technical field of concrete preparation, in particular to early strength concrete with an ultra-retarding effect and a preparation process thereof.
Background
The concrete is artificial stone which is prepared by taking cement as a main cementing material, adding water, sand, stones and chemical additives and mineral admixtures if necessary, mixing the materials according to a proper proportion, uniformly stirring, densely molding, curing and hardening.
The existing concrete is generally formed by pouring after mixing and stirring aggregate, a cementing material and various auxiliary agents. In some large-scale bridge projects, in order to improve the bearing capacity of a single pile, the length and the cross section of the pile are large, the volume of concrete needed to be poured into the single pile is large, the pouring time is long, and especially in hot summer, the initial setting time of the concrete needs to be greatly prolonged, so that the success of one-time pouring can be ensured. The initial setting time of the common concrete is about 6-8 hours, so the common concrete cannot adapt to the construction working condition.
Disclosure of Invention
The invention aims to provide early strength concrete with an ultra-retarding effect and a preparation process thereof.
The above object of the present invention is achieved by the following technical solutions:
the early strength concrete with the super retarding effect is prepared from the following raw materials in parts by weight:
by adopting the technical scheme, the super retarder is added to prolong the initial setting time of concrete, improve the fluidity of the concrete, facilitate the operation of workers and improve the working efficiency and quality. The early strength agent is added to improve the early strength of the concrete so as to meet the requirement that the concrete needs to bear external force in the early stage, thereby improving the performance of the concrete. By adding the active admixture, the cement can be saved, the cost can be reduced, the workability and pumpability of concrete mixtures can be improved, the alkali-aggregate reaction can be inhibited, and the strength and durability of concrete can be improved. 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 tap water.
The invention is further configured to: the retarding concrete is also added with 3-7 parts by weight of reinforcing agent, and the reinforcing agent comprises the following raw materials in percentage by weight:
by adopting the technical scheme, the reinforcing agent is added to improve the overall strength and durability of the concrete and endow the concrete with good performance.
The distribution of the polyacrylic acid fibers and the steel fibers in the concrete results in a uniform fiber network. Cracks in the hardened concrete slurry will continue to propagate when the concrete is subjected to impact or bending loads, and when the cracks grow to a certain extent, the concrete may crack and fail. Under the condition, the fiber network can prevent crack propagation on one hand, and on the other hand, the fiber can bear partial tensile stress, so that the stress intensity of the crack tip in the slurry is reduced, the cracking damage of the cement slurry is reduced or delayed, and the fracture toughness and the strength of the concrete are improved.
The PVP/graphene composite material is prepared by adopting the method that the PVP/graphene composite material can adsorb chloride ions at high level and the adsorption mechanism is adopted, and the stable PVP chemically modified graphene aqueous solution is obtained. The concrete can adsorb free chloride ions in the concrete and prevent the steel fiber and the steel bar in the concrete from being corroded, thereby improving the anti-corrosion capability of the concrete and slowing down the degradation and failure of the performance of the concrete structure. Meanwhile, the PVP/graphene composite material has good strength and wear resistance, and can improve the strength and wear resistance of concrete.
The dodecyl benzene sulfonic acid triethanolamine ester is a cationic surfactant and is used for modifying the PVP/graphene composite material, the polyacrylic acid fiber and the steel fiber, reducing the interfacial tension between the PVP/graphene composite material, the polyacrylic acid fiber and the steel fiber and the surface of a concrete hydration product, and improving the bonding strength between the PVP/graphene composite material, the polyacrylic acid fiber and the steel fiber and the surface of the hydration product, so that the strength of the concrete is improved.
After the cement is hydrated, cations such as free calcium ions, magnesium ions, sodium ions and the like in a pore solution are used for enabling the surface of a pore, the surface of a C-S-H gel and the like to be negatively charged, after the cationic surfactant is adsorbed to the surface of a hydration product, the zeta potential of the cationic surfactant can be changed from negative to positive, the surface of the hydration product has stronger positive electricity, and the cationic surfactant can adsorb more free chlorine ions through electrostatic action, so that the physical adsorption capacity is enhanced, the anti-rusting capacity of the concrete is improved, and the degradation and the failure of the performance of a concrete structure are slowed down. And the bonding strength of the polyacrylic acid fiber, the steel fiber and the PVP/graphene composite material with the surface of the hydration product is improved, so that the strength of the concrete is improved.
The gelatin is used as a thickening agent to improve the combination strength of the PVP/graphene composite material on the steel fiber and the polypropylene fiber and the combination strength of the steel fiber, the polypropylene fiber and the surface of a hydration product, so that the strength of the concrete is improved. And can be used as a water reducing agent to improve the fluidity and cohesiveness of concrete.
The invention is further configured to: the super retarder comprises the following raw materials in percentage by weight:
by adopting the technical scheme, the cane sugar belongs to molasses retarding water reducers, has strong solid-liquid surface activity, can be adsorbed on the surfaces of unhydrated cement particles to form a layer of shielding film, and blocks the hydration process of cement, thereby generating a retarding effect. Sodium tripolyphosphate is a phosphate retarder, and can be combined with calcium ions in cement to be solidified in the cement hydration process, and the solidified sediment can be accumulated on the surface of unhydrated cement particles, so that the effect of inhibiting cement hydration is achieved, and the effect of retarding coagulation is achieved.
The zinc oxide reacts with hydroxyl to generate zinc hydroxide, and the zinc hydroxide is precipitated on the surface of cement particles to form a film with low solubility and low permeability, so that the further hydration of the cement is inhibited, and the retarding effect is generated. When the colloidal zinc hydroxide is converted into crystalline zinc calcium hydroxide, the retardation effect is finished.
The sodium gluconate is a derivative of glucose, and can be adsorbed on calcium hydroxide crystal nuclei generated in the hydration process in the cement hydration process when added, so that the sodium gluconate is inhibited from continuously growing, and the retarding effect is achieved. The sodium lignosulfonate water reducing agent is a typical anionic surfactant, has higher molecular weight and certain air entraining effect, and can improve the fluidity of concrete and reduce the using amount of water. The super retarder is compounded by multiple retarders of different types, so that a certain synergistic effect can be achieved, and the application range is expanded.
The dispersing agent is mainly used for improving the dispersing effect of the retarder, so that the retarder is more uniformly dispersed in cement, and the retarding effect is better. The dispersant used was XLX-1361, a wetting dispersant manufactured by chenchen Taixin Lanxing science and technology Co.
The invention is further configured to: the early strength agent is prepared from the following raw materials in percentage by weight:
by adopting the technical scheme, the triethanolamine is a common early strength agent, has a retarding effect, and is commonly used to be compounded with a retarder so as to improve the early strength of concrete.
The roasted magnesium-aluminum carbonate hydrotalcite has a large specific surface area, can adsorb chloride ions, and has negative charges, so that the adhesion effect of the roasted magnesium-aluminum carbonate hydrotalcite on the fiber surface can be improved, the steel fibers are effectively prevented from being corroded, and the anti-corrosion effect of concrete is improved. And the roasted magnesium-aluminum carbonate hydrotalcite has good wear resistance and strength, and can be used in combination with triethanolamine to improve the strength and durability of concrete. Meanwhile, triethanolamine can be adsorbed in the concrete body, a slow-release effect is achieved, the problem that the initial setting time of the concrete is advanced due to the addition of an early strength agent, the construction of the concrete is influenced, the working efficiency and the quality are improved, and the initial setting time of the concrete is further prolonged.
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 binding strength of triethanolamine on the roasted magnesium-aluminum carbonate hydrotalcite are improved.
After the anionic surfactant is adsorbed to the surface of the hydration product, the zeta potential of the anionic surfactant is increased, so that the electrostatic repulsion between the anionic surfactant and chlorine ions is enhanced, and the adsorbed chlorine 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. The method mainly 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, slightly reduces the chloride ion adsorption capacity of cement paste, prevents steel fibers from being corroded, and improves the strength of concrete.
The invention is further configured to: the active admixture comprises the following raw materials in percentage by weight:
by adopting the technical scheme, the fly ash, the granulated blast furnace slag powder, the superfine silicon powder and the lithium slag can form alkali slag hardened slurry under the action of the alkali excitant, and the alkali slag hardened slurry is a compact homogeneous network body formed by hydrated C-S-H gel and unhydrated slag and belongs to a chemical bonding network. The fiber network can be mutually blended with a fiber network body in slurry, and the complementary advantages are achieved through interaction. As can be known from the interpenetrating network theory, the cross-linking nodes of the cement paste network and the fiber network have great influence on the performance of the material. When the network nodes of the cement paste are increased, namely the hydration products C-S-H gel are more, the macroscopic performance of the cement paste can be greatly improved; when the network nodes of the fibers are increased, namely the distance between the fibers is reduced, the crack resistance and toughening effect of the fibers on the cement-based material are more obvious. The stronger the interaction between the cement paste network and the fiber network, the more excellent the performance of the material.
The lithium slag can improve the early strength of the concrete, and the fly ash can prolong the initial setting time of the concrete. The sodium tripolyphosphate in the super retarder can be used as an alkali activator to promote the fly ash, the granulated blast furnace slag powder, the superfine silicon powder and the lithium slag to form alkali slag hardened slurry.
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. Meanwhile, the impact resistance and the strength of the concrete are 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 early strength concrete with super retarding effect comprises the following process steps:
1) uniformly mixing ordinary portland cement, coarse aggregates, fine aggregates, active admixtures, polycarboxylic acid water reducing agents, super retarders, reinforcing agents and water according to a proportion, adding the early strength agents, 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 early-strength concrete with the super-retarding effect.
By adopting the technical scheme, the reinforcing agent is added in the step 1) and is uniformly stirred, then the early strength agent is added, and the reinforcing agent has positive and negative charges, and the early strength agent has negative charges, so that when the reinforcing agent and the early strength agent are added into the concrete mixture and are mixed together, the reinforcing agent and the early strength agent react to agglomerate together, thereby influencing the dispersion effect and the combination strength of the reinforcing agent and the early strength agent in the concrete mixture and influencing the reinforcing effect of the concrete. And the reinforcing agent is added firstly and stirred uniformly, and then the early strength agent is added, so that the reinforcing agent can be attached to the surface of the hydration product firstly, and the surface of the hydration product is provided with positive charges, thereby improving the attachment strength of the early strength agent on the surface of the hydration product, improving the dispersion effect of the early strength agent in concrete and improving the strength of the concrete.
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 super retarder is added to prolong the initial setting time of concrete, improve the fluidity of the concrete, facilitate the operation of workers and improve the working efficiency and quality;
2. the early strength agent is added to improve the early strength of the concrete so as to meet the requirement that the concrete needs to bear external force in the early stage, thereby improving the performance of the concrete;
3. by adding the active admixture, the cement can be saved, the cost can be reduced, the workability and pumpability of concrete mixtures can be improved, the alkali-aggregate reaction can be inhibited, and the strength and durability of concrete can be improved;
4. the reinforcing agent is added to improve the overall strength and durability of the concrete and endow the concrete with good performance;
5. 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 invention discloses a preparation process of early strength concrete with an ultra-retarding effect, which comprises the following process steps:
1) according to the weight parts, 190 parts of ordinary portland cement, 1200 parts of coarse aggregate, 620 parts of fine aggregate, 250 parts of active admixture, 8 parts of polycarboxylic acid water reducing agent, 8 parts of super retarder, 3 parts of reinforcing agent and 190 parts of water are uniformly mixed, then 6 parts of early strength admixture is added and uniformly stirred, and a concrete mixture is prepared;
wherein the active admixture comprises the following raw materials in percentage by weight:
wherein the super retarder comprises the following raw materials in percentage by weight:
wherein, the reinforcing agent comprises the following preparation steps: according to the weight percentage, firstly, 10% of dodecylbenzene sulfonic acid triethanolamine ester, 8% of gelatin, 18% of PVP/graphene composite material and 20% of deionized water are uniformly mixed, then 22% of polyacrylic acid fiber and 22% of steel fiber are added, and the mixture is uniformly stirred to prepare the reinforcing agent;
the early strength agent comprises the following preparation steps: according to the weight percentage, firstly, uniformly mixing 25% of triethanolamine, 5% of dodecyl glucoside, 4% of sodium dodecyl benzene sulfonate and 31% of deionized water, then adding 35% of roasted magnesium aluminum carbonate hydrotalcite, and uniformly stirring to prepare the early strength agent;
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 2 mm;
and step 3: and after the concrete layer and the coating material are dried and cured, polishing and flattening the surface of the concrete layer to obtain the early-strength concrete with the super-retarding effect.
Examples 2 to 5 differ from example 1 in that the early strength concrete having an ultra-retarding effect was prepared from the following raw materials in parts by weight:
examples 6-9 differ from example 1 in that the reinforcing agent comprises the following raw materials in weight percent:
examples 10-13 differ from example 1 in that the super retarder comprises the following raw materials in weight percent:
examples 14-17 differ from example 1 in that the early strength agent is prepared from 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 the super retarder is not included in the early strength concrete having the super retarding effect;
comparative example 2 is different from example 1 in that the early strength concrete having an ultra-retarding effect does not include an early strength agent;
comparative example 3 is different from example 1 in that the reinforcing agent is not included in the early strength concrete having the super-retarding effect;
the comparative example 4 is different from the example 1 in that the step 3) is not included in the preparation process of the early strength concrete with the super retarding effect;
comparative example 5 differs from example 1 in step 1 of the process for the preparation of early strength concrete with ultra-retarding effect: uniformly mixing ordinary portland cement, coarse aggregates, fine aggregates, active admixtures, polycarboxylic acid water reducing agents, super retarders, reinforcing agents, early strength agents and water according to a proportion to prepare concrete mixtures;
comparative example 6 differs from example 1 in that the early strength agent does not include calcined magnesium aluminum carbonate hydrotalcite;
comparative example 7 differs from example 1 in that the PVP/graphene composite is not included in the enhancer.
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 7 was selected as control samples 1 to 7.
1) And (3) corrosion resistance detection: the test samples 1-5 and the reference samples 1-7 are made into standard test blocks according to GB/T50080-2002' common concrete mixture Performance test methodAnd then the test pieces prepared by the test samples 1-5 and the control samples 1-5 are put into a salt spray box for neutral salt spray test after being maintained for 28 days. 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 1-7 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. compared with the comparative example 1, the examples 1 to 5 show that the addition of the super retarder can prolong the initial setting time of concrete, prevent the steel bars and steel fibers from being corroded to a certain extent, and improve the strength of the concrete; the sodium tripolyphosphate in the super retarder can be used as an alkali activator to promote the fly ash, the granulated blast furnace slag powder, the superfine silicon powder and the lithium slag to form alkali slag hardened slurry, so that the alkali slag hardened slurry and the fiber network body are mutually blended in the slurry, and the effect of complementary advantages is achieved through interaction, and the strength of the concrete is improved;
2. compared with the comparative example 2, the examples 1 to 5 show that the early strength of the concrete can be improved by adding the early strength agent, the reinforcing steel bars and the steel fibers can be prevented from being corroded to a certain extent, and the early strength and the initial setting time of the concrete can be improved;
3. as can be seen from comparison of examples 1-5 with comparative example 3, the addition of the reinforcing agent can improve the overall strength and durability of the concrete and impart good performance to the concrete;
4. as can be seen from the comparison between examples 1 to 5 and comparative example 4, a protective film can be formed outside the concrete layer by coating a 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 strength of the concrete are improved;
5. compared with the comparative example 5, the examples 1-5 show that the reinforcing agent is added in the step 1) and uniformly stirred, and then the early strength agent is added, so that the reinforcing agent can be attached to the surface of the hydration product firstly, and the surface of the hydration product is provided with positive charges, thereby improving the attachment strength of the early strength agent on the surface of the hydration product, improving the dispersion effect of the early strength agent in concrete and improving the strength of the concrete;
6. as can be seen from comparison of examples 1-5 with comparative example 2 and comparative example 6, the addition of the roasted magnesium aluminum carbonate hydrotalcite can improve the strength and the corrosion prevention effect of the concrete and can prolong the initial setting time of the concrete to a certain extent;
7. as can be seen from comparison of examples 1-5 with comparative examples 3 and 7, the addition of the PVP/graphene composite material can improve the anticorrosion effect and the strength of the concrete.
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. The early strength concrete with the super retarding effect is characterized in that: the health-care food is prepared from the following raw materials in parts by weight:
2. the early strength concrete with super retarding effect as claimed in claim 1, wherein: the retarding concrete is also added with 3-7 parts by weight of reinforcing agent, and the reinforcing agent comprises the following raw materials in percentage by weight:
3. the early strength concrete with super retarding effect according to claim 2, wherein: the super retarder comprises the following raw materials in percentage by weight:
4. the early strength concrete with super retarding effect according to claim 2, wherein: the early strength agent is prepared from the following raw materials in percentage by weight:
5. the early strength concrete with super retarding effect according to claim 2, wherein: the active admixture comprises the following raw materials in percentage by weight:
6. the early strength concrete with super retarding effect as claimed in 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 early strength concrete with super retarding effect is characterized in that: the method comprises the following process steps:
1) uniformly mixing ordinary portland cement, coarse aggregates, fine aggregates, active admixtures, polycarboxylic acid water reducing agents, super retarders, reinforcing agents and water according to a proportion, adding the early strength agents, 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 early-strength concrete with the super-retarding effect.
8. The process for preparing early strength concrete with super retarding effect according to claim 7, wherein: 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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| CN112080263A (en) * | 2020-09-21 | 2020-12-15 | 西南石油大学 | Preparation method of slow-release retarder for well cementation |
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| CN115093157A (en) * | 2022-06-10 | 2022-09-23 | 山东冠晔新材料科技有限公司 | Concrete retarder and preparation method thereof |
| CN115159929A (en) * | 2022-07-29 | 2022-10-11 | 山东建筑大学 | Preparation method of ultra-high performance concrete |
| CN117567130A (en) * | 2024-01-15 | 2024-02-20 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Retarding and rapid hardening PVA fiber cement-based composite material and preparation method and application thereof |
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