CN111233411A - High-toughness and ultra-high-performance concrete doped with metakaolin and magnesium oxide and preparation method thereof - Google Patents
High-toughness and ultra-high-performance concrete doped with metakaolin and magnesium oxide and preparation method thereof Download PDFInfo
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- CN111233411A CN111233411A CN202010230386.0A CN202010230386A CN111233411A CN 111233411 A CN111233411 A CN 111233411A CN 202010230386 A CN202010230386 A CN 202010230386A CN 111233411 A CN111233411 A CN 111233411A
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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
- C04B28/10—Lime cements or magnesium oxide cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide, which is prepared by mixing the following components in percentage by mass: metakaolin: magnesium oxide: silica fume: quartz powder: water reducing agent: water: quartz sand = 1: 0.05-0.2: 0.05-0.2: 0.25-0.45: 0.3-0.5: 0.02-0.04: 0.3-0.4: 1.2-1.5, and the volume mixing amount of the steel fiber is 0.5-3%. The flexural strength of the concrete is greatly improved compared with the ultra-high performance concrete with the same water-cement ratio, cement-sand ratio and steel fiber mixing amount. In the practical application of the ultra-high performance concrete, the use amount of reinforcing steel bars can be reduced due to higher flexural strength, and even the reinforcing steel bars are not added, so that the material cost and the labor cost are favorably reduced. The ordinary portland cement produces pollution in the production process, and the metakaolin and the magnesium oxide are used for replacing part of the ordinary portland cement, so that the environment is protected.
Description
Technical Field
The invention relates to the technical field of building materials in civil engineering, in particular to high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide and a preparation method thereof.
Background
The concrete has the advantages of wide raw material source, low cost, simple and convenient production process, convenient use and the like, and becomes a building material with the largest dosage and the widest application in civil engineering. Because the concrete has great weight, great brittleness and low breaking strength, and is not suitable for super high-rise structures and large-span bridges, the super high-performance concrete with high breaking strength, high compressive strength and high durability is produced.
The ultra-high performance concrete has the compression strength, the breaking strength and the durability which are far higher than those of common concrete, and can generally meet the requirements of the compression strength and the durability in the actual engineering application. The ultra-high performance concrete has the advantages that the ultra-high performance concrete has outstanding advantages, for example, the compressive strength of the ultra-high performance concrete reaches more than 150MPa, the ultra-high performance concrete has excellent toughness, fracture energy, durability, wear resistance and corrosion resistance, and strong carbonization resistance, chloride ion permeation resistance and sulfate corrosion resistance, and a large amount of unhydrated cement particles exist, so that the concrete has a self-repairing function, the self weight is light, and the cost can be saved. There has been no research on high-toughness ultra-high performance concrete doped with metakaolin and magnesium oxide.
At present, CN 105272027 Jiangsu Subo new materials GmbH invented an ultra-high performance concrete with compressive strength above 300MPa and its preparation method. Ordinary portland cement, an admixture, a nano material, a viscosity reducer, sand, fiber, a high-efficiency water reducing agent, a powder dispersing agent and water are mixed according to a certain mixing ratio to prepare the ultra-high performance concrete. Although the ultra-high performance concrete has ultra-high mechanical property, the ultra-high performance concrete has 85 percent of mechanical property under the environment of standard atmospheric pressure°C~90°The compressive strength of the C after thermal curing reaches more than 300MPa, the flexural strength is more than 55MPa, but the used materials are superfine admixture and nano material, so that the production cost is greatly increased, and the economic benefit is not good.
Although the flexural strength of the ultra-high performance concrete is greatly improved compared with that of the common concrete, a certain amount of tensile steel bars still need to be configured in the practical engineering application to improve the flexural bearing capacity of the structure. Therefore, the construction process of the ultra-high performance concrete is more complicated, the construction period is longer and the labor cost is more in the engineering application. The anti-breaking strength of the ultra-high performance concrete is improved, the using amount of reinforcing steel bars can be effectively reduced, and even the reinforcing steel bars are not used, so that the construction process is simplified, the labor cost is reduced, and the economic benefit is improved.
Disclosure of Invention
The invention relates to a high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide, which is prepared by mixing the following components in percentage by mass: metakaolin: magnesium oxide: silica fume: quartz powder: water reducing agent: water: quartz sand = 1: 0.05-0.2: 0.05-0.2: 0.25-0.45: 0.3-0.5: 0.02-0.04: 0.3-0.4: 1.2-1.5, and the volume mixing amount of the steel fiber is 0.5-3%.
The strength grade of the ordinary portland cement is 42.5 grade or 52.5 grade; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent with the water reducing rate of more than 20 percent. The particle size of the metakaolin is less than 8 mu m; the particle size of the magnesium oxide is less than 10 mu m; the particle size of the silica fume is 0.1-0.2 mu m; the particle size of the quartz powder is less than 40 mu m; the fineness modulus of the quartz sand is 1.0-2.0, and the particle size is 100-125 mu m; the length of the steel fiber is 5-20 mm, the diameter is 0.1-0.3 mm, and the tensile strength is greater than 2000 MPa.
The preparation method of the high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide comprises the following steps: placing ordinary portland cement, silica fume, metakaolin, magnesium oxide, quartz sand and quartz powder in a mortar mixer to be mixed for 3 minutes, aiming at uniformly distributing various materials; mixing the water reducing agent and water and uniformly stirring; adding a mixture of half of the water reducing agent and water by mass into ordinary portland cement during stirring, stirring for 3 minutes, adding the remaining mixture of the water reducing agent and water, and continuing stirring for 3 minutes to form cement paste; finally, adding the steel fibers and stirring for 4 minutes to ensure that the steel fibers are uniformly distributed in the cement paste.
The curing system of the high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide is characterized by comprising the following steps of: and (3) removing the mold after standard curing is carried out for 24 hours, then carrying out autoclaved curing, wherein the autoclaved curing system is vacuumizing for half an hour, heating and boosting for 1 hour, keeping the temperature and pressure constant for 6 hours and the pressure constant for 2 hours, keeping the temperature constant at 190-200 ℃, keeping the pressure constant at 1.2MPa, after the autoclaved curing is finished, carrying out standard curing to the curing age, and forming the high-toughness ultrahigh-performance concrete finished product after the curing is finished.
In the actual engineering application of the ultra-high performance concrete, a certain amount of tensile steel bars still need to be configured to improve the bending resistance bearing capacity, because the chain length of the main hydration product C-S-H of the ordinary portland cement can be lengthened by the aluminum in the metakaolin and the magnesium in the magnesium oxide, the metakaolin and the magnesium oxide can generate hydrotalcite-like crystals in an alkaline environment, the crystals can fill the interface of aggregates and cement stones and the pores in the cement stones, and the breaking strength and the breaking ratio of the concrete are improved, so that the use amount of the steel bars can be reduced by adopting the high-toughness ultra-high performance concrete doped with the metakaolin and the magnesium oxide, and even the steel bars are not used. A certain amount of magnesium oxide and metakaolin are used for replacing common portland cement, so that the cement has a better self-repairing function. Due to the compact pore structure and the self-repairing function to microcracks, the high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide provided by the invention has better durability. Because metakaolin and magnesium oxide can replace part of ordinary portland cement, the carbon emission generated by the production of ordinary portland cement is reduced, and the environment is protected.
The invention has the following remarkable advantages:
(1) by adding metakaolin and magnesium oxide, the flexural strength and the flexural strength ratio (the flexural strength can reach 60MPa, and the flexural strength ratio reaches 0.4) of the ultra-high performance concrete are greatly improved, the using amount of reinforcing steel bars in the ultra-high performance concrete structure is reduced, even the reinforcing steel bars are not used, so that the construction process of the ultra-high performance concrete in practical application is simplified, the labor cost is reduced, and the economic benefit is improved.
(2) Compared with the ultra-high performance concrete with the same water-cement ratio, rubber-sand ratio and steel fiber mixing amount, the ultra-high performance concrete provided by the patent has better interface structure, pore structure and microcrack self-repairing function due to the addition of metakaolin and magnesium oxide, and therefore has better durability.
(3) The high-toughness ultrahigh-performance concrete doped with the metakaolin and the magnesium oxide uses the metakaolin and the magnesium oxide to replace part of ordinary portland cement, so that the consumption of the ordinary portland cement is reduced, the carbon emission generated by the ordinary portland cement is reduced, and the environment protection benefit is good.
Detailed Description
The high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide has the following mixing ratio (mass ratio): ordinary portland cement: metakaolin: magnesium oxide: silica fume: quartz powder: water reducing agent: water: quartz sand = 1: 0.05-0.2: 0.05-0.2: 0.25-0.45: 0.3-0.5: 0.02-0.04: 0.3-0.4: 1.2-1.5, and the volume mixing amount of the steel fiber is 0.5-3%.
The strength grade of the ordinary portland cement is 42.5 grade or 52.5 grade; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent with the water reducing rate of more than 20 percent. The particle size of the metakaolin is less than 8 mu m; the particle size of the magnesium oxide is less than 10 mu m; the particle size of the silica fume is 0.1-0.2 mu m; the particle size of the quartz powder is less than 40 mu m; the fineness modulus of the quartz sand is 1.0-2.0, and the particle size is 100-125 mu m; the length of the steel fiber is 5-20 mm, the diameter is 0.1-0.3 mm, and the tensile strength is greater than 2000 MPa.
The preparation method of the high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide comprises the following steps: placing ordinary portland cement, silica fume, metakaolin, magnesium oxide, quartz sand and quartz powder in a mortar mixer to be mixed for 3 minutes, aiming at uniformly distributing various materials; mixing the water reducing agent and water and uniformly stirring; adding a mixture of half of the water reducing agent and water by mass into ordinary portland cement during stirring, stirring for 3 minutes, adding the remaining mixture of the water reducing agent and water, and continuing stirring for 3 minutes to form cement paste; finally, adding the steel fibers and stirring for 4 minutes to ensure that the steel fibers are uniformly distributed in the cement paste.
The curing system of the high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide is characterized by comprising the following steps of: and (3) removing the mold after standard curing is carried out for 24 hours, then carrying out autoclaved curing, wherein the autoclaved curing system is vacuumizing for half an hour, heating and boosting for 1 hour, keeping the temperature and pressure constant for 6 hours and the pressure constant for 2 hours, keeping the temperature constant at 190-200 ℃, keeping the pressure constant at 1.2MPa, after the autoclaved curing is finished, carrying out standard curing to the curing age, and forming the high-toughness ultrahigh-performance concrete finished product after the curing is finished.
Example 1
The high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide has the following mixing ratio (mass ratio): ordinary portland cement: metakaolin: magnesium oxide: silica fume: quartz powder: water reducing agent: water: quartz sand = 1: 0.05: 0.05: 0.25: 0.3: 0.02: 0.3: 1.2, the volume mixing amount of the steel fiber is 0.5 percent. In order to ensure the strength of concrete, ordinary Portland cement with the strength grade of 42.5 is used as the cement, and a polycarboxylic acid high-efficiency water reducing agent with the water reducing rate of 25% is used. The particle size of the metakaolin is less than 8 μm, and the particle size of the magnesium oxide is less than 10 μm. The particle size of the silica fume is 0.1-0.2 mu m; the particle size of the quartz powder is less than 40 μm. The particle size of the quartz sand is 100-125 μm. The length of the steel fiber is 5mm, the diameter is 0.1mm, and the tensile strength is 2050 MPa.
Ordinary portland cement, silica fume, metakaolin, magnesium oxide, quartz sand and quartz powder are placed in a mortar mixer to be stirred for 3 minutes, aiming at uniformly distributing various materials. And mixing the water reducing agent and water and uniformly stirring. During the stirring process of the ordinary portland cement, a mixture of half of the water reducing agent and water is added and stirred for 3 minutes, and then the remaining mixture of the water reducing agent and water is added and stirred for 3 minutes continuously to form cement paste. Finally, adding the steel fibers and stirring for 4 minutes to ensure that the steel fibers are uniformly distributed in the cement paste.
Removing a mold after standard curing for 24 hours, and then performing autoclaved curing, wherein the autoclaved curing system comprises vacuumizing for half an hour, heating and boosting for 1 hour, keeping the temperature and the pressure constant for 6 hours, reducing the pressure for 2 hours, and keeping the temperature constant at 190-200 DEG C°And C, keeping the constant pressure at 1.2MPa, after the autoclaved curing is finished, performing standard curing to the curing age, and finishing the curing to form a concrete finished product.
The high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide has the average compressive strength of 143.29MPa, the average breaking strength of 58.21MPa and the breaking ratio of 0.41 in 7 days.
Example 2
The high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide has the following mixing ratio (mass ratio): ordinary portland cement: metakaolin: magnesium oxide: silica fume: quartz powder: water reducing agent: water: quartz sand = 1: 0.2: 0.2: 0.45: 0.5: 0.04: 0.4: 1.5, the volume mixing amount of the steel fiber is 3 percent. In order to ensure the strength of the concrete, ordinary Portland cement with the strength grade of 42.5 is used as the cement; and the slag amount in the ordinary portland cement should be as small as possible. The polycarboxylic acid high-efficiency water reducing agent with the water reducing rate of more than 20 percent is used. The particle size of the metakaolin is less than 8 μm, and the particle size of the magnesium oxide is less than 10 μm. The particle size of the silica fume is 0.1-0.2 mu m; the particle size of the quartz powder is less than 40 μm. The particle size of the quartz sand is 100-125 μm. The steel fiber has a length of 20mm, a diameter of 0.3mm and a tensile strength of 2100 MPa.
Ordinary portland cement, silica fume, metakaolin, magnesium oxide, quartz sand and quartz powder are placed in a mortar mixer to be stirred for 3 minutes, aiming at uniformly distributing various materials. And mixing the water reducing agent and water and uniformly stirring. During the stirring process of the ordinary portland cement, a mixture of half of the water reducing agent and water is added and stirred for 3 minutes, and then the remaining mixture of the water reducing agent and water is added and stirred for 3 minutes continuously to form cement paste. Finally, adding the steel fibers and stirring for 4 minutes to ensure that the steel fibers are uniformly distributed in the cement paste.
Removing a mold after standard curing for 24 hours, and then performing autoclaved curing, wherein the autoclaved curing system comprises vacuumizing for half an hour, heating and boosting for 1 hour, keeping the temperature and the pressure constant for 6 hours, reducing the pressure for 2 hours, and keeping the temperature constant at 190-200 DEG C°And C, keeping the constant pressure at 1.2MPa, after the autoclaved curing is finished, performing standard curing to the curing age, and finishing the curing to form a concrete finished product.
The high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide has the average compressive strength of 160.23MPa, the average flexural strength of 66.34MPa and the flexural-compression ratio of 0.41 in 7 days.
Example 3
The high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide has the following mixing ratio (mass ratio): ordinary portland cement: metakaolin: magnesium oxide: silica fume: quartz powder: water reducing agent: water: quartz sand = 1: 0.106: 0.070: 0.353: 0.435: 0.029: 0.321: 1.376, the volume mixing amount of the steel fiber is 2 percent. In order to ensure the strength of the concrete, ordinary Portland cement with the strength grade of 42.5 is used as the cement; and the slag amount in the ordinary portland cement should be as small as possible. The polycarboxylic acid high-efficiency water reducing agent with the water reducing rate of more than 20 percent is used. The particle size of the metakaolin is less than 8 μm, and the particle size of the magnesium oxide is less than 10 μm. The particle size of the silica fume is 0.1-0.2 mu m; the particle size of the quartz powder is less than 40 μm. The particle size of the quartz sand is 100-125 μm. The steel fiber has a length of 13mm, a diameter of 0.2mm and a tensile strength of 2000 MPa.
Ordinary portland cement, silica fume, metakaolin, magnesium oxide, quartz sand and quartz powder are placed in a mortar mixer to be stirred for 3 minutes, aiming at uniformly distributing various materials. And mixing the water reducing agent and water and uniformly stirring. During the stirring process of the ordinary portland cement, a mixture of half of the water reducing agent and water is added and stirred for 3 minutes, and then the remaining mixture of the water reducing agent and water is added and stirred for 3 minutes continuously to form cement paste. Finally, adding the steel fibers and stirring for 4 minutes to ensure that the steel fibers are uniformly distributed in the cement paste.
Removing a mold after standard curing for 24 hours, and then performing autoclaved curing, wherein the autoclaved curing system comprises vacuumizing for half an hour, heating and boosting for 1 hour, keeping the temperature and the pressure constant for 6 hours, reducing the pressure for 2 hours, and keeping the temperature constant at 190-200 DEG C°And C, keeping the constant pressure at 1.2MPa, after the autoclaved curing is finished, performing standard curing to the curing age, and finishing the curing to form a concrete finished product.
The high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide has the average compressive strength of 150.15MPa, the average flexural strength of 60.32MPa and the flexural-compression ratio of 0.40 in 7 days.
The present invention is further illustrated by the following examples, but is not limited thereto.
Claims (5)
1. The high-toughness ultrahigh-performance concrete doped with metakaolin and magnesium oxide is characterized in that the components are mixed according to the following mass ratio: metakaolin: magnesium oxide: silica fume: quartz powder: water reducing agent: water: quartz sand = 1: 0.05-0.2: 0.05-0.2: 0.25-0.45: 0.3-0.5: 0.02-0.04: 0.3-0.4: 1.2-1.5, and the volume mixing amount of the steel fiber is 0.5-3%.
2. The metakaolin and magnesium oxide doped, high toughness, ultra high performance concrete of claim 1, wherein the portland cement has a strength grade of 42.5 or 52.5; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent with the water reducing rate of more than 20 percent.
3. The high toughness ultra high performance concrete doped with metakaolin and magnesium oxide of claim 1, wherein: the particle size of the metakaolin is less than 8 mu m; the particle size of the magnesium oxide is less than 10 mu m; the particle size of the silica fume is 0.1-0.2 mu m; the particle size of the quartz powder is less than 40 mu m; the fineness modulus of the quartz sand is 1.0-2.0, and the particle size is 100-125 mu m; the length of the steel fiber is 5-20 mm, the diameter is 0.1-0.3 mm, and the tensile strength is greater than 2000 MPa.
4. A method of making a high toughness ultra high performance concrete incorporating metakaolin and magnesium oxide as claimed in claim 1, comprising the steps of: placing ordinary portland cement, silica fume, metakaolin, magnesium oxide, quartz sand and quartz powder in a mortar mixer to be mixed for 3 minutes, aiming at uniformly distributing various materials; mixing the water reducing agent and water and uniformly stirring; adding a mixture of half of the water reducing agent and water by mass into ordinary portland cement during stirring, stirring for 3 minutes, adding the remaining mixture of the water reducing agent and water, and continuing stirring for 3 minutes to form cement paste; finally, adding the steel fibers and stirring for 4 minutes to ensure that the steel fibers are uniformly distributed in the cement paste.
5. A curing system for high toughness ultra high performance concrete incorporating metakaolin and magnesium oxide as claimed in claim 1, comprising the steps of: and (3) removing the mold after standard curing is carried out for 24 hours, then carrying out autoclaved curing, wherein the autoclaved curing system is vacuumizing for half an hour, heating and boosting for 1 hour, keeping the temperature and pressure constant for 6 hours and the pressure constant for 2 hours, keeping the temperature constant at 190-200 ℃, keeping the pressure constant at 1.2MPa, after the autoclaved curing is finished, carrying out standard curing to the curing age, and forming the high-toughness ultrahigh-performance concrete finished product after the curing is finished.
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| CN113185217A (en) * | 2021-04-22 | 2021-07-30 | 同济大学 | Ultra-high performance concrete containing metakaolin and preparation method thereof |
| CN113321457A (en) * | 2021-06-29 | 2021-08-31 | 福州大学 | Method for preparing ultra-high performance concrete by doping oyster shell powder and metakaolin |
| CN113982593A (en) * | 2021-11-08 | 2022-01-28 | 安徽理工大学 | Ultrahigh-strength well drilling well wall and method for manufacturing ultrahigh-strength well drilling well wall |
| CN114605117A (en) * | 2022-03-10 | 2022-06-10 | 东南大学 | High-alkalinity high-temperature-resistant ultrahigh-performance concrete material and preparation method thereof |
| CN116161930A (en) * | 2023-03-10 | 2023-05-26 | 汇通建设集团股份有限公司 | High-performance node grouting material and preparation method thereof |
| CN117105561A (en) * | 2023-08-25 | 2023-11-24 | 河南省科学院 | Chloride ion response rust-resistant steel bar surface low-carbon protective material and preparation method thereof |
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| CN117105561A (en) * | 2023-08-25 | 2023-11-24 | 河南省科学院 | Chloride ion response rust-resistant steel bar surface low-carbon protective material and preparation method thereof |
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