CN111943595B - High-strength white concrete and preparation method thereof - Google Patents
High-strength white concrete and preparation method 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0081—Uses not provided for elsewhere in C04B2111/00 as catalysts or catalyst carriers
- C04B2111/00827—Photocatalysts
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/80—Optical properties, e.g. transparency or reflexibility
- C04B2111/82—Coloured materials
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention belongs to the technical field of building materials, relates to concrete, and particularly relates to high-strength white concrete and a preparation method thereof. The technical points are as follows: the composition comprises the following components in parts by weight: 70-100 parts of white portland cement, 10-30 parts of white mineral powder, 10-30 parts of white limestone powder, 5-15 parts of metakaolin, 5-10 parts of titanium dioxide, 100-200 parts of river sand, 120-150 parts of light-color aggregate, 35-50 parts of water, 1-3 parts of a water reducing agent, 0.2-0.5 part of a retarder, 5-10 parts of carbon quantum dots and 5-8 parts of sodium chloropalladate. According to the high-strength white concrete and the preparation method thereof, the carbon quantum dots and the sodium chloropalladate are added, so that the early heat release rate of the concrete is reduced, and the strength and the anti-cracking performance of the concrete are improved; inhibit the formation of ice nucleuses and prevent the white concrete from corroding and discoloring after being covered by ice and snow in severe cold areas.
Description
Technical Field
The invention belongs to the technical field of building materials, relates to concrete, and particularly relates to high-strength white concrete and a preparation method thereof.
Background
With the development of social economy, the requirements of people on buildings are not limited to basic use functions, the requirements on the aspects of attractiveness, decoration and the like are higher and higher, white fair-faced concrete is favored by people with unique appearance effects, and at present, the white fair-faced concrete is more and more built, and the consumption of the white fair-faced concrete is obviously increased, such as a Dow Square, a Shanghai Jinshan modern agricultural park, an Atha and Liya east commercial plaza project, a Muslim temple in the Gulshan community, a Boer culture theater, a Kotedisan Su Mukoro and a Dairy church and the like.
The white concrete is attractive in appearance and good in decorative effect, however, most areas of China are in the northern temperate zone, the white concrete is long in winter, the temperature in most areas is low, the phenomenon that the snow of a building is frozen generally exists, harmful substances in the snow and ice not only corrode the white concrete to cause the concrete to crack, but also cause the white concrete to be carbonized, yellow and discolored, and the attractiveness is lost.
In view of the above-mentioned drawbacks of the conventional white concrete, the present inventors have conducted extensive research and innovation based on practical experience and professional knowledge of many years of design and manufacture of such products in combination with the application of theories, in order to create a high-strength white concrete and a method for preparing the same, which can prevent ice and snow from accumulating on the surface of the white concrete by suppressing the formation of ice nuclei, and can improve the low-temperature resistance of the concrete to prevent cracking and yellowing due to carbonization. After continuous research and design and repeated trial production and improvement, the invention with practical value is finally created.
Disclosure of Invention
The invention aims to provide high-strength white concrete which has the advantages of cracking resistance and carbonization resistance and has industrial value.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides a composition which comprises the following components in parts by weight: 70-100 parts of white portland cement, 10-30 parts of white mineral powder, 10-30 parts of white limestone powder, 5-15 parts of metakaolin, 5-10 parts of titanium dioxide, 100-200 parts of river sand, 120-150 parts of light-color aggregate, 35-50 parts of water, 1-3 parts of a water reducing agent, 0.2-0.5 part of a retarder, 5-10 parts of carbon quantum dots and 5-8 parts of sodium chloropalladate. Compared with common cement, the white Portland cement has the advantages of early hydration reaction, high hydration speed and high hydration heat release rate, so that a large temperature gradient is generated inside and outside the concrete, a large temperature stress is generated, and accordingly, a temperature crack is generated, sodium chloropalladate is dissolved in water and hydrolyzed, a large amount of heat is absorbed, the heat release rate of the white Portland cement is delayed, the temperature gradient inside and outside the concrete is reduced, and the early cracking of the white Portland cement is prevented; meanwhile, the metal cation is grafted on the carbon quantum dots to form a synergistic effect with the carbon quantum dots, so that the freezing point is lowered, the surface tension of white concrete is adjusted, the generation of ice nuclei is inhibited, and ice and snow are prevented from being accumulated on the surface.
Further, the carbon quantum dot is a carbon quantum dot surface-modified with an amino group. The carbon quantum dots with the surface modified by the amino groups have high activity and are easy to react with metal cations to form carbon quantum dot double salts, so that the synergistic effect is improved, and the ice inhibition capability is further improved.
Further, the precursor of the carbon quantum dot is citric acid. Citric acid is used as a precursor to generate carbon quantum dots, so that the surfaces of the carbon quantum dots are provided with carboxylic acid groups, and the carboxylic acid groups can further adjust the surface tension of concrete, thereby improving the ice inhibition performance; and meanwhile, carboxylic acid groups react with limestone powder to form a network skeleton structure, so that the strength and the cracking resistance of the concrete are effectively improved.
Furthermore, the paint also comprises 10-20 parts of polysilazane containing hydrophilic groups according to the parts by weight. Although polysilazane has hydrophilic groups, the polysilazane is insoluble in water, and the hydrophilic groups of the polysilazane can generate hydrogen bonds with water molecules to lock the water molecules, so that water drops can be rapidly gathered on the protrusions macroscopically, and then automatically leave the surface of concrete under the action of gravity, and the purposes of snow melting and deicing are achieved.
Further, the polysilazane is perhydropolysilazane or inorganic polysilazane. The perhydropolysilazane and the inorganic polysilazane can prevent the hydrogen and oxygen in the white portland cement from being abstracted, so that the white portland cement is prevented from being carbonized, and the white portland cement is kept white; and simultaneously, the freezing point is lowered to prevent freezing.
Further, the air-entraining agent comprises 1-5 parts by weight.
Further, the air entraining agent is a mixture of rosin resin air entraining agent and sodium borohydride. The weight ratio of the rosin resin air entraining agent to the sodium borohydride is 10 (1-2), the sodium borohydride is added to react with a hydrolysate of sodium chloropalladate to generate hydrogen, bubbles formed by gas are more uniform in size due to the addition of the air entraining agent, the bubbles can be guaranteed to form bubbles with the diameter of about 200nm, and the bubbles shrink into bulges with the diameter of about 100nm after being cured, so that a more effective waterproof self-cleaning effect is achieved.
Further, the photocatalyst comprises 10-20 parts by weight of photocatalyst. The photocatalyst is added into the white concrete, so that pollutants remained on the surface of the concrete are subjected to photocatalytic degradation to be micromolecules, and the micromolecules are washed away from the surface of the white concrete along with rainwater, and the self-cleaning effect is further improved.
Further, the photocatalyst comprises sodium zincate, butterfly scale powder and boron nitride modified titanium dioxide particles. After the magnesium zincate is dissolved in water, hydrolysis reaction is carried out, heat is absorbed, the heat release rate of concrete is reduced, early cracking is prevented, and meanwhile magnesium hydroxide and magnesium series crystals are generated to expand, so that the shrinkage of the concrete is inhibited, and the cracking is further prevented; the butterfly scale powder contains chitin, and can degrade organic molecules under the condition of illumination; simultaneously, the cement additive contains hydrocarbons with different carbon atoms, high fatty alcohol and high fatty acid, effectively inhibits the carbonization of white silicate cement under the action of magnesium hydroxide, can inhibit the activity of harmful gas, and reduces the corrosion of the harmful gas to the surface of the white silicate concrete; in the boron nitride modified titanium dioxide particles, the boron element can capture the nitrogen element in the organic matter, so that the organic matter molecules are rapidly decomposed, and the self-cleaning efficiency is improved.
Further, the weight ratio of the magnesium zincate, the butterfly scale powder and the boron nitride modified titanium dioxide particles in the photocatalyst is 1: (1-2): (1-3).
The second purpose of the invention is to provide a preparation method of high-strength white concrete, which has the same effect.
The technical effects of the invention are realized by the following technical scheme:
the invention provides a preparation method of high-strength white concrete, which comprises the following operation steps:
s1, mixing 70-100 parts of white portland cement, 10-30 parts of white mineral powder, 10-30 parts of white limestone powder, 5-15 parts of metakaolin, 5-10 parts of titanium dioxide and 35-50 parts of water, and stirring for 5-7 hours to obtain a mixture A;
s2, adding 5-10 parts of carbon quantum dots and 5-8 parts of sodium chloropalladate into the mixture A, and stirring for 1-3 hours to obtain a mixture B;
and S3, adding 100-200 parts of river sand, 120-150 parts of light-color aggregate, 1-3 parts of water reducing agent and 0.2-0.5 part of retarder into the mixture B, and continuously stirring to obtain the high-strength white concrete.
Preferably, the method comprises the following steps:
s1, mixing 70-100 parts of white portland cement, 10-30 parts of white mineral powder, 10-30 parts of white limestone powder, 5-15 parts of metakaolin, 5-10 parts of titanium dioxide and 35-50 parts of water together, and stirring for 5-7 hours to obtain a mixture A;
s2, adding 5-10 parts of carbon quantum dots and 5-8 parts of sodium chloropalladate into the mixture A, and stirring for 1-3 hours to obtain a mixture B;
and S3, adding 100-200 parts of river sand, 120-150 parts of light-color aggregate, 1-3 parts of water reducing agent, 0.2-0.5 part of retarder and 1-5 parts of polysilazane into the mixture B, and continuously stirring to obtain the high-strength white concrete.
Preferably, the method comprises the following specific steps:
s1, mixing 70-100 parts of white portland cement, 10-30 parts of white mineral powder, 10-30 parts of white limestone powder, 5-15 parts of metakaolin, 5-10 parts of titanium dioxide and 35-50 parts of water together, and stirring for 5-7 hours to obtain a mixture A;
s2, adding 5-10 parts of carbon quantum dots and 5-8 parts of sodium chloropalladate into the mixture A, and stirring for 1-3 hours to obtain a mixture B;
and S3, adding 100-200 parts of river sand, 120-150 parts of light-color aggregate, 1-3 parts of water reducing agent, 1-5 parts of air entraining agent, 0.2-0.5 part of retarder and 1-5 parts of polysilazane into the mixture B, and continuously stirring to obtain the high-strength white concrete.
Preferably, in the step S3, 10 to 20 parts of photocatalyst is added after continuously stirring for 3 to 4 hours. The white self-cleaning concrete is in a semi-cured state, the photocatalyst is added at the moment, the photocatalyst, particularly butterfly scale powder, can be fixed in a framework of portland cement to prevent loss, and meanwhile, magnesium hydroxide can inhibit the later-stage shrinkage of the concrete through expansion to prevent cracking.
In conclusion, the invention has the following beneficial effects:
according to the high-strength white concrete and the preparation method thereof, the carbon quantum dots and the sodium chloropalladate are added, so that the early heat release rate of the concrete is reduced, and the strength and the anti-cracking performance of the concrete are improved; meanwhile, the purpose of inhibiting ice nucleation is achieved by adjusting the surface tension of the concrete, and the white concrete is prevented from corroding and discoloring after being covered by ice and snow in severe cold areas; meanwhile, the addition of the photocatalyst reduces the concrete carbonization, degrades pollutants and realizes self-cleaning under the rain wash.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the embodiments, features and effects of the high-strength concrete and the preparation method thereof according to the present invention are described in detail below.
Example 1: the high-strength white concrete comprises the following components in parts by weight: 70-100 parts of white portland cement, 10-30 parts of white mineral powder, 10-30 parts of white limestone powder, 5-15 parts of metakaolin, 5-10 parts of titanium dioxide, 100-200 parts of river sand, 120-150 parts of light-color aggregate, 35-50 parts of water, 1-3 parts of a water reducing agent, 0.2-0.5 part of a retarder, 5-10 parts of carbon quantum dots and 5-8 parts of sodium chloropalladate.
A preparation method of high-strength white concrete comprises the following operation steps:
s1, mixing 70-100 parts of white portland cement, 10-30 parts of white mineral powder, 10-30 parts of white limestone powder, 5-15 parts of metakaolin, 5-10 parts of titanium dioxide and 35-50 parts of water together, and stirring for 5-7 hours to obtain a mixture A;
s2, adding 5-10 parts of carbon quantum dots and 5-8 parts of sodium chloropalladate into the mixture A, and stirring for 1-3 hours to obtain a mixture B;
and S3, adding 100-200 parts of river sand, 120-150 parts of light-color aggregate, 1-3 parts of water reducing agent and 0.2-0.5 part of retarder into the mixture B, and continuously stirring to obtain the high-strength concrete.
Example 2: the high-strength white concrete comprises the following components in parts by weight: 100 parts of white portland cement, 30 parts of white mineral powder, 30 parts of white limestone powder, 5 parts of metakaolin, 5 parts of titanium dioxide, 200 parts of river sand, 150 parts of light-color aggregate, 50 parts of water, 1 part of water reducing agent, 0.2 part of retarder, 5 parts of carbon quantum dots, 8 parts of sodium chloropalladate and 5 parts of polysilazane.
The preparation method comprises the following steps:
s1, mixing 100 parts of white portland cement, 30 parts of white mineral powder, 30 parts of white limestone powder, 5 parts of metakaolin, 5 parts of titanium dioxide and 50 parts of water together, and stirring for 5-7 hours to obtain a mixture A;
s2, adding 5 parts of carbon quantum dots and 8 parts of sodium chloropalladate into the mixture A, and stirring for 1-3 hours to obtain a mixture B;
and S3, adding 200 parts of river sand, 150 parts of light-color aggregate, 1 part of water reducing agent, 0.2 part of retarder and 5 parts of polysilazane into the mixture B, and continuously stirring to obtain the high-strength white concrete.
Example 3: the high-strength white concrete comprises the following components in parts by weight: 100 parts of white portland cement, 30 parts of white mineral powder, 30 parts of white limestone powder, 5 parts of metakaolin, 5 parts of titanium dioxide, 200 parts of river sand, 150 parts of light-color aggregate, 50 parts of water, 1 part of water reducing agent, 0.2 part of retarder, 5 parts of carbon quantum dots, 8 parts of sodium chloropalladate and 5 parts of polysilazane.
The preparation method comprises the following steps:
s1, mixing 100 parts of white portland cement, 30 parts of white mineral powder, 30 parts of white limestone powder, 5 parts of metakaolin, 5 parts of titanium dioxide and 50 parts of water, and stirring for 5-7 hours to obtain a mixture A;
s2, adding 5 parts of carbon quantum dots and 8 parts of sodium chloropalladate into the mixture A, and stirring for 1-3 hours to obtain a mixture B;
and S3, adding 200 parts of river sand, 150 parts of light-color aggregate, 1 part of water reducing agent, 0.2 part of retarder and 5 parts of polysilazane into the mixture B, and continuously stirring to obtain the high-strength white concrete.
The carbon quantum dot is a water-soluble carbon quantum dot synthesized by using citric acid as a carbonization precursor and 11-aminoundecanoic acid as an organic coating agent under a high-temperature pyrolysis condition.
Example 4: the high-strength white concrete comprises the following components in parts by weight: 80 parts of white portland cement, 15 parts of white mineral powder, 20 parts of white limestone powder, 15 parts of metakaolin, 10 parts of titanium dioxide, 200 parts of river sand, 150 parts of light-color aggregate, 50 parts of water, 1 part of water reducing agent, 0.2 part of retarder, 5 parts of carbon quantum dots and 5 parts of sodium chloropalladate.
A preparation method of high-strength white concrete comprises the following operation steps:
s1, mixing 80 parts of white portland cement, 15 parts of white mineral powder, 20 parts of white limestone powder, 15 parts of metakaolin, 10 parts of titanium dioxide and 50 parts of water together, and stirring for 5-7 hours to obtain a mixture A;
s2, adding 5 parts of carbon quantum dots and 5 parts of sodium chloropalladate into the mixture A, and stirring for 1-3 hours to obtain a mixture B;
and S3, adding 200 parts of river sand, 150 parts of light-color aggregate, 1 part of water reducing agent and 0.2 part of retarder into the mixture B, and continuously stirring to obtain the high-strength concrete.
The carbon quantum dots are water-soluble carbon quantum dots synthesized by using citric acid as a carbonization precursor and 11-aminoundecanoic acid as an organic coating agent under a high-temperature pyrolysis condition, and are subjected to surface modification through amino.
Example 5: the high-strength white concrete comprises the following components in parts by weight: 75 parts of white portland cement, 12 parts of white mineral powder, 13 parts of white limestone powder, 8 parts of metakaolin, 8 parts of titanium dioxide, 125 parts of river sand, 130 parts of light-color aggregate, 50 parts of water, 1 part of water reducing agent, 0.2 part of retarder, 5 parts of carbon quantum dots, 5 parts of sodium chloropalladate, 4.5 parts of rosin resin air entraining agent and 0.5 part of sodium borohydride.
A preparation method of high-strength white concrete comprises the following operation steps:
s1, mixing 75 parts of white portland cement, 12 parts of white mineral powder, 13 parts of white limestone powder, 8 parts of metakaolin, 8 parts of titanium dioxide and 50 parts of water together, and stirring for 5-7 hours to obtain a mixture A;
s2, adding 5 parts of carbon quantum dots and 5 parts of sodium chloropalladate into the mixture A, and stirring for 1-3 hours to obtain a mixture B;
s3, adding 125 parts of river sand, 130 parts of light-color aggregate, 1 part of water reducing agent, 4.5 parts of rosin resin air entraining agent, 0.5 part of sodium borohydride, 0.2 part of retarder and 5 parts of polysilazane into the mixture B, and continuously stirring to obtain the high-strength white concrete.
The carbon quantum dots are water-soluble carbon quantum dots synthesized by using citric acid as a carbonization precursor and 11-aminoundecanoic acid as an organic coating agent under a high-temperature pyrolysis condition, and the surface of the carbon quantum dots is modified by using amino.
Example 6: the high-strength white concrete comprises the following components in parts by weight: 75 parts of white portland cement, 12 parts of white mineral powder, 13 parts of white limestone powder, 8 parts of metakaolin, 8 parts of titanium dioxide, 125 parts of river sand, 130 parts of light-color aggregate, 50 parts of water, 1 part of water reducing agent, 0.2 part of retarder, 5 parts of carbon quantum dots, 5 parts of sodium chloropalladate rosin resin air entraining agent, 4.5 parts of sodium borohydride, 1 part of magnesium zincate, 2 parts of butterfly scale powder and 3 parts of boron nitride modified titanium dioxide particles.
A preparation method of high-strength white concrete comprises the following operation steps:
s1, mixing 75 parts of white portland cement, 12 parts of white mineral powder, 13 parts of white limestone powder, 8 parts of metakaolin, 8 parts of titanium dioxide and 50 parts of water together, and stirring for 5-7 hours to obtain a mixture A;
s2, adding 5 parts of carbon quantum dots and 5 parts of sodium chloropalladate into the mixture A, and stirring for 1-3 hours to obtain a mixture B;
s3, adding 125 parts of river sand, 130 parts of light-color aggregate, 1 part of water reducing agent, 4.5 parts of rosin resin air entraining agent, 0.5 part of sodium borohydride, 0.2 part of retarder and 5 parts of polysilazane into the mixture B, continuously stirring for 3 hours, adding 1 part of magnesium zincate, 2 parts of butterfly scale powder and 3 parts of boron nitride modified titanium dioxide particles, and uniformly stirring to obtain the high-strength white concrete.
The carbon quantum dots are water-soluble carbon quantum dots synthesized by using citric acid as a carbonization precursor and 11-aminoundecanoic acid as an organic coating agent under a high-temperature pyrolysis condition, and are subjected to surface modification through amino.
Comparative example: the white concrete comprises the following components in parts by weight: 100 parts of white portland cement, 30 parts of white mineral powder, 30 parts of white limestone powder, 15 parts of metakaolin, 10 parts of titanium dioxide, 200 parts of river sand, 150 parts of light-color aggregate, 50 parts of water, 3 parts of a water reducing agent and 0.5 part of a retarder.
The preparation method comprises the following steps:
s1, mixing 100 parts of white portland cement, 30 parts of white mineral powder, 30 parts of white limestone powder, 15 parts of metakaolin and 10 parts of titanium dioxide with water, and stirring for 5-7 hours to obtain a mixture A;
s2, adding 200 parts of river sand, 150 parts of light-color aggregate, 50 parts of water, 3 parts of water reducing agent and 0.5 part of retarder into the mixture A, and continuously stirring to obtain the white self-cleaning concrete.
Examples 1 to 6 and comparative examples were tested according to the following specific test procedures:
the concrete compressive strength is tested according to the standard of concrete physical and mechanical property test method GB/T50081-2019, the test block size is 150mm multiplied by 150mm, and the test age is 28 d.
The anti-freezing performance of the concrete is tested according to the GB/T50082-2009 quick freezing method of the standard test method for the long-term performance and durability of common concrete, the size of a test block is 100mm multiplied by 400mm, and the test age is 28 d.
The early-stage crack resistance of the concrete is tested according to the early-stage crack resistance large slab method of GB/T50082-2009 Standard test method for the long-term performance and durability of common concrete.
The long-term crack resistance of the concrete is tested according to the long-term shrinkage test of GB/T50082-2009 Standard test methods for the long-term performance and durability of common concrete.
The self-cleaning performance of the concrete is evaluated by testing the contact angle of the surface of the concrete, and the test method is carried out according to the technical specification for application of antifreeze waterproof alloy powder T/CECS 521-2018.
The frost resistance of the concrete is evaluated according to the evaluation standard of concrete durability test JGJ/T193-2009.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. The high-strength white concrete is characterized by comprising the following components in parts by weight: 70-100 parts of white portland cement, 10-30 parts of white mineral powder, 10-30 parts of white limestone powder, 5-15 parts of metakaolin, 5-10 parts of titanium dioxide, 100-200 parts of river sand, 120-150 parts of light-color aggregate, 35-50 parts of water, 1-3 parts of a water reducing agent, 0.2-0.5 part of a retarder, 5-10 parts of carbon quantum dots, 5-8 parts of sodium chloropalladate, 1-5 parts of polysilazane, 1-5 parts of an air entraining agent and 10-20 parts of a photocatalyst; the photocatalyst comprises magnesium zincate, butterfly scale powder and boron nitride modified titanium dioxide particles; the precursor of the carbon quantum dot is citric acid.
2. The high-strength white concrete according to claim 1, wherein the carbon quantum dots are carbon quantum dots surface-modified by amino groups.
3. A method for preparing high-strength white concrete according to claim 1 or 2, characterized by comprising the following operating steps:
s1, mixing 70-100 parts of white portland cement, 10-30 parts of white mineral powder, 10-30 parts of white limestone powder, 5-15 parts of metakaolin, 5-10 parts of titanium dioxide and 35-50 parts of water together, and stirring for 5-7 min to obtain a mixture A;
s2, adding 5-10 parts of carbon quantum dots and 5-8 parts of sodium chloropalladate into the mixture A, and stirring for 1-3 min to obtain a mixture B;
and S3, adding 100-200 parts of river sand, 120-150 parts of light-color aggregate, 1-3 parts of water reducing agent, 0.2-0.5 part of retarder, 1-5 parts of polysilazane and 1-5 parts of air entraining agent into the mixture B, continuously stirring for 3-4 min, and then adding 10-20 parts of photocatalyst to obtain the high-strength white concrete.
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| CN114455882B (en) * | 2022-01-05 | 2022-12-16 | 江苏奥莱特新材料股份有限公司 | Preparation method and application of multifunctional nano composite material for concrete |
| CN116835942A (en) * | 2023-07-04 | 2023-10-03 | 贵阳中建西部建设有限公司 | White bare concrete and preparation method thereof |
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