CN110642579A - Marine sulphoaluminate cement for rapid construction and preparation method thereof - Google Patents
Marine sulphoaluminate cement for rapid construction and preparation method thereof Download PDFInfo
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- CN110642579A CN110642579A CN201911112561.XA CN201911112561A CN110642579A CN 110642579 A CN110642579 A CN 110642579A CN 201911112561 A CN201911112561 A CN 201911112561A CN 110642579 A CN110642579 A CN 110642579A
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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
- C04B28/06—Aluminous 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/24—Sea water resistance
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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 marine sulphoaluminate cement for rapid construction and a preparation method thereof, wherein the marine sulphoaluminate cement is prepared from the following raw materials in parts by weight: 40-60 parts of sulphoaluminate cement clinker, 5-10 parts of modified nano calcium carbonate, 0.05-0.2 part of high-efficiency water reducing agent, 0-4 parts of accelerator, 6-8 parts of anti-cracking waterproof expanding agent, 3-5 parts of redispersible latex powder, 10-15 parts of clinker sea sand, 2-5 parts of silica fume, 6-10 parts of granulated blast furnace slag powder and 0.01-0.1 part of modified graphene. The concrete prepared by the marine sulphoaluminate cement can be quickly cured, has higher early strength, can reach the demolding strength earlier, can be widely applied to marine engineering buildings, and meets the requirement of quick construction in marine environment.
Description
Technical Field
The invention relates to the technical field of ocean engineering building materials, in particular to marine sulphoaluminate cement for rapid construction and a preparation method thereof.
Background
Sulphoaluminate Cement (CSA) was successfully developed by the national institute of building materials science in 1975 and won the second-class prize of the invention in 1982. It is prepared from alumina, limestone and gypsum through calcining at 1300-1350 deg.C to obtain calcium sulphoaluminate (C)4A3S ̅) and dicalcium silicate (C)2S) is clinker of main mineral phase, and is ground together with a proper amount of gypsum to prepare the hydraulic cementing material with the characteristics of short setting time, high early strength, low alkalinity and the like. When grinding the sulfoaluminate cement, a part of the mixed materials (limestone, fly ash and the like) are usually added according to the requirement. The sulphoaluminate cement has the following advantages: 1. the structure is compact, and the anti-permeability performance is high; 2. corrosion resistance: for seawater and chlorine salt (NaCl, MgCl)2) Sulfate (Na)2SO4、MgSO4、(NH4) 2SO4) In particular their complex salts (MgSO)4+ NaCl), etc., all having excellent corrosion resistance; 3. high freezing resistance; 4. the early strength is high, the later strength is increased continuously, the setting time required by use is met, and the compressive strength can reach 35-50 MPa within 12 h-1 d; the breaking strength can reach 6.5-7.5 MPa. The 3d compressive strength can reach 50-70 MPa; the breaking strength can reach 7.5-8.5 MPa.
China has 1.8 kilometers of coastline, there are a large number of tidal zones, and many islands are far from continents. Due to the influence of marine climate, tide and the like, the concrete construction conditions and the construction time of engineering structures such as ports, wharfs, bridges and the like in the marine environment can not be ensured, the early strength of the concrete is slowly developed, the concrete demoulding time is long, and the requirement of rapid construction of engineering in the marine environment can not be met. Although cement or concrete for rapid construction is available in many cases, most of the cement or concrete is used for land construction, has no corrosion resistance and is not suitable for ocean engineering. At present, the special cement and concrete suitable for rapid construction under the marine condition are few, the concrete can be prepared only by adopting common cement in the marine engineering construction, measures such as concrete early strength agents and the like are adopted for construction, and the technical problems of slow development of compressive strength, poor corrosion resistance, short service life and the like still exist, so that the normal construction of the concrete under the marine environment is influenced. Therefore, it is necessary to provide some cement or concrete for rapid construction in marine environment to meet the construction requirements of marine environment.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the marine sulphoaluminate cement for rapid construction and the preparation method thereof.
The technical scheme of the invention is realized in the following mode:
the marine sulphoaluminate cement for rapid construction is prepared from the following raw materials in parts by weight: 40-60 parts of sulphoaluminate cement clinker, 5-10 parts of modified nano calcium carbonate, 0.05-0.2 part of high-efficiency water reducing agent, 0-4 parts of accelerator, 6-8 parts of anti-cracking waterproof expanding agent, 3-5 parts of redispersible latex powder, 10-15 parts of clinker sea sand, 2-5 parts of silica fume, 6-10 parts of granulated blast furnace slag powder and 0.01-0.1 part of modified graphene.
The modified nano calcium carbonate is prepared by mixing dry nano calcium carbonate and SP-1800 polyester hyper-dispersant in a weight ratio of 10:1 and stirring for 30min at a constant temperature of 110 ℃.
The high-efficiency water reducing agent comprises modified melamine and a polycarboxylate water reducing agent, wherein the weight ratio of the modified melamine to the polycarboxylate water reducing agent is 1:2, and the fineness of the modified melamine is below 100 meshes.
The accelerating agent is prepared from potassium metaaluminate, lithium metaaluminate and polyvinyl alcohol according to a mass ratio of 9-10: 1: 0.3-0.0.4, and the polyvinyl alcohol is sieved by a 200-mesh sieve.
The anti-cracking waterproof expanding agent is a GNA efficient anti-cracking waterproof expanding agent.
The redispersible latex powder is one of ethylene-vinyl acetate copolymer, vinyl acetate-vinyl versatate copolymer or acrylate-styrene copolymer.
The clinker sea sand is prepared by cleaning sea sand, drying, mixing the sea sand with rubber powder, ball-milling, treating at 160-180 ℃ for 2-5h, and standing; then crushing and grinding to obtain particles with the average particle size of less than 100 micrometers; mixing the obtained granules with EPS granules; and ball-milling the obtained mixture for 4-8h to obtain the product.
The granulated blast furnace slag micro powder is prepared by granulating slag, fly ash and calcium carbonate by water quenching of a blast furnaceIs obtained by mixing and grinding according to the weight ratio of 25:6:6:0.5, and the specific surface area is 800-4000m2/kg。
The preparation method of the marine sulphoaluminate cement comprises the following steps:
(1) grinding the sulphoaluminate cement clinker, clinker sea sand, silica fume and granulated blast furnace slag powder by using a cement mill, so that the passing rate of the sulphoaluminate cement clinker passing through a 100-mesh sieve reaches more than 95 percent;
(2) adding modified nano calcium carbonate, a high-efficiency water reducing agent, an accelerating agent, an anti-cracking waterproof expanding agent, redispersible latex powder and modified graphene into the raw materials obtained in the step (1), and fully and uniformly mixing to obtain a semi-finished marine sulphoaluminate cement;
(3) conveying the semi-finished marine sulphoaluminate cement into a finished product homogenizing silo by using a lifter, and homogenizing air generated at the bottom of the homogenizing silo to obtain a finished marine sulphoaluminate cement.
The invention has the beneficial effects that:
the sulphoaluminate cement has the basic characteristics of early strength, high impermeability, high frost resistance, corrosion resistance, low alkali, low production energy consumption and the like. The marine sulphoaluminate cement for rapid construction is prepared by taking sulphoaluminate cement clinker as a master batch and adding modified nano calcium carbonate, a high-efficiency water reducing agent, an accelerating agent, an anti-cracking waterproof expanding agent, redispersible latex powder, clinker sea sand, silica fume, granulated blast furnace slag powder and modified graphene. The slurry structure prepared by the marine sulphoaluminate cement has good compactness and volume stability; the concrete has excellent impermeability and frost resistance, has high chloride ion diffusion resistance and sulfate erosion resistance, meets the requirements of ocean engineering construction, and solves the problem that the concrete is subjected to k in seawater in ocean engineering+、Cl- The problems of strong destructiveness such as building damage, short service life and the like after salt erosion and seawater scouring are solved, and the problems of low early hydration speed, low strength and Ca (OH) after hydration of the portland cement are overcome2 The high content thereof causes the disadvantages in the aspects of anti-permeability and anti-corrosion.
The sea sand clinker obtained by cleaning and drying the sea sand, and then mixing and grinding the sea sand with the rubber powder and the EPS particles in sequence overcomes the problem of high chloride ion concentration of the sea sand, improves the chloride ion permeation resistance of concrete, enables the marine building engineering to use local materials and saves cost. The composite use of the granulated blast furnace slag micro powder can increase the hydration efficiency and the secondary hydration degree in the middle and later stages of the hydration hardening of the cementing material, greatly improve the compactness of a transition zone of a hydration product and an aggregate interface, and improve the micropore structure of a cementing material system, thereby enhancing the corrosion resistance of the hardened grouting material.
The modified nano calcium carbonate, the sea sand clinker and the granulated blast furnace slag micro powder are combined and applied to concrete, so that the filling effect of the nano calcium carbonate can be fully exerted, the porosity is reduced, the compactness of a concrete structure is increased, meanwhile, the modified nano calcium carbonate has good dispersibility, the self agglomeration of the nano calcium carbonate is eliminated, the particle size is reduced, the distribution is uniform, and the uniform dispersion of the nano calcium carbonate in the cement is facilitated. High-activity nano calcium carbonate and C in concrete3The reaction of A generates hydrated calcium aluminate carbonate, which promotes the hydration of cement to improve the strength of hardened body. In addition, the modified nano calcium carbonate particles are used as crystal nuclei to form C-S-H gel on the surfaces of the particles to form a three-dimensional network structure with the modified nano calcium carbonate particles as the crystal nuclei, so that the sub-microstructure structure of the concrete is improved, and the durability of the concrete structure is improved. The modified graphene can effectively improve the compatibility among the raw materials and improve the stability of the finished concrete.
Potassium metaaluminate and lithium metaaluminate in the accelerator are dissolved in water to obtain tetrahydroxy potassium metaaluminate and tetrahydroxy lithium metaaluminate, and the tetrahydroxy potassium metaaluminate and the tetrahydroxy lithium metaaluminate have very high chemical activity and can instantaneously react with calcium ions in cement to form a composite complex, so that concrete is quickly condensed and hardened, the initial setting time and the final setting time of the cement are greatly shortened, the construction efficiency is improved, and the requirement of quick construction is met; the lithium tetrahydroxy meta-aluminate is an excellent inhibitor for preventing the alkali aggregate reaction of the concrete, and simultaneously, the strength of the concrete is increased.
The GNA high-efficiency anti-cracking waterproof expanding agent has the performances of low heat, high strength, compactness, micro-expansion, self-stress, compensation shrinkage and the like.The GNA efficient anti-cracking waterproof expanding agent has the advantages of multiple expansion sources, large expansion efficiency, low use amount, strong adaptability with other additives, low total alkali range (0.15-0.25 percent), which is far lower than the standard requirement of the building material industry by 0.78 percent, and the aluminosilicate mineral in the expanding agent has K pair+、Na+Has the function of adsorption and fixation, and can further reduce the total alkali content in the concrete. Cl in GNA high-efficiency anti-cracking waterproof expanding agent-The active ions have very low content, do not contain toxin and heavy metal, and are a new generation of green environment-friendly building material product. The GNA efficient anti-cracking waterproof expanding agent is matched with functional materials such as an air entraining agent, aluminosilicate minerals and the like, so that the construction performance of fresh concrete can be improved, and the physical performance of hardened concrete can be improved. The GNA high-efficiency anti-cracking waterproof expanding agent changes the original harmful component MgO in the expanding agent into a controllable expansion source Mg (OH) through a special calcining technology and a grinding process2The harm is changed into the benefit; and by using a dispersion technology, the GNA has good dispersibility in the concrete, the GNA can be uniformly dispersed in the concrete under the condition of full stirring, and the phenomenon of local over-expansion caused by uneven dispersion is avoided. Ettringite, Mg (OH) in GNA high-efficiency anti-cracking waterproof expanding agent2Under the combined action of various expansion hydrates, the shrinkage generated in different ages in the early stage, the middle stage and the later stage of the hydration hardening of the concrete can be properly compensated, the shrinkage compensation effect is timely and sufficient, and the compensation effect is ideal.
The redispersible latex powder emulsion is dispersed in cement to form a film and used as a second adhesive to play a role in enhancing, so that the colloid is protected from being absorbed by a concrete system (the colloid cannot be damaged by water after being formed into the film, or is dispersed for the second time), and the film-formed polymer resin is used as an enhancing material to be distributed in the whole concrete system. The redispersible latex powder used in the invention has outstanding waterproof performance and good bonding strength, can increase the elasticity of concrete, endow the concrete with excellent alkali resistance, improve the adhesiveness/adhesiveness, the breaking strength, the plasticity, the wear resistance and the constructability of the concrete, and has stronger flexibility in flexible anti-crack concrete.
Detailed Description
In order to describe the present invention in more detail, the present invention will be further described with reference to the following examples.
Example 1
The marine sulphoaluminate cement for rapid construction is prepared from the following raw materials in parts by weight: 40 parts of sulphoaluminate cement clinker, 5 parts of modified nano calcium carbonate, 0.05 part of high-efficiency water reducing agent, 4 parts of accelerating agent, 6 parts of anti-cracking waterproof expanding agent, 3 parts of redispersible latex powder, 10 parts of clinker sea sand, 2 parts of silica fume, 6 parts of granulated blast furnace slag powder and 0.01 part of modified graphene.
The modified nano calcium carbonate is prepared by mixing dry nano calcium carbonate and SP-1800 polyester hyper-dispersant in a weight ratio of 10:1 and stirring for 30min at a constant temperature of 110 ℃.
The high-efficiency water reducing agent comprises modified melamine and a polycarboxylate water reducing agent, wherein the weight ratio of the modified melamine to the polycarboxylate water reducing agent is 1:2, and the fineness of the modified melamine is below 100 meshes.
The accelerating agent is prepared from potassium metaaluminate, lithium metaaluminate and polyvinyl alcohol in a mass ratio of 9: 1: 0.3, and the polyvinyl alcohol is sieved by a 200-mesh sieve.
The anti-cracking waterproof expanding agent is a GNA efficient anti-cracking waterproof expanding agent.
The redispersible latex powder is one of ethylene-vinyl acetate copolymer, vinyl acetate-vinyl versatate copolymer or acrylate-styrene copolymer.
The clinker sea sand is prepared by cleaning sea sand, drying, mixing the sea sand with rubber powder, ball-milling, treating at 160 ℃ for 5 hours, and standing; then crushing and grinding to obtain particles with the average particle size of less than 100 micrometers; mixing the obtained granules with EPS granules; and performing ball milling on the obtained mixture for 4 hours to obtain the composite material.
The granulated blast furnace slag micro powder is obtained by mixing and grinding blast furnace water-quenched granulated slag, fly ash and calcium carbonate in a weight ratio of 25:6:6:0.5, and the specific surface area is 800-4000m2/kg。
The preparation method of the marine sulphoaluminate cement comprises the following steps:
(1) grinding the sulphoaluminate cement clinker, clinker sea sand, silica fume and granulated blast furnace slag powder by using a cement mill, so that the passing rate of the sulphoaluminate cement clinker passing through a 100-mesh sieve reaches more than 95 percent;
(2) adding modified nano calcium carbonate, a high-efficiency water reducing agent, an accelerating agent, an anti-cracking waterproof expanding agent, redispersible latex powder and modified graphene into the raw materials obtained in the step (1), and fully and uniformly mixing to obtain a semi-finished marine sulphoaluminate cement;
(3) conveying the semi-finished marine sulphoaluminate cement into a finished product homogenizing silo by using a lifter, and homogenizing air generated at the bottom of the homogenizing silo to obtain a finished marine sulphoaluminate cement. The screen allowance of the finished product, namely a 1.18mm screen, is 0.1 percent.
Example 2
The marine sulphoaluminate cement for rapid construction is prepared from the following raw materials in parts by weight: 50 parts of sulphoaluminate cement clinker, 8 parts of modified nano calcium carbonate, 0.1 part of high-efficiency water reducing agent, 2 parts of accelerating agent, 7 parts of anti-cracking waterproof expanding agent, 4 parts of redispersible latex powder, 12 parts of clinker sea sand, 4 parts of silica fume, 8 parts of granulated blast furnace slag powder and 0.05 part of modified graphene.
The modified nano calcium carbonate is prepared by mixing dry nano calcium carbonate and SP-1800 polyester hyper-dispersant in a weight ratio of 10:1 and stirring for 30min at a constant temperature of 110 ℃.
The high-efficiency water reducing agent comprises modified melamine and a polycarboxylate water reducing agent, wherein the weight ratio of the modified melamine to the polycarboxylate water reducing agent is 1:2, and the fineness of the modified melamine is below 100 meshes.
The accelerating agent is prepared from potassium metaaluminate, lithium metaaluminate and polyvinyl alcohol in a mass ratio of 9: 1: 0.3, and the polyvinyl alcohol is sieved by a 200-mesh sieve.
The anti-cracking waterproof expanding agent is a GNA efficient anti-cracking waterproof expanding agent.
The redispersible latex powder is one of ethylene-vinyl acetate copolymer, vinyl acetate-vinyl versatate copolymer or acrylate-styrene copolymer.
The clinker sea sand is prepared by cleaning sea sand, drying, mixing the sea sand with rubber powder, ball-milling, treating at 170 ℃ for 4 hours, and standing; then crushing and grinding to obtain particles with the average particle size of less than 100 micrometers; mixing the obtained granules with EPS granules; and performing ball milling on the obtained mixture for 6 hours to obtain the composite material.
The granulated blast furnace slag micro powder is obtained by mixing and grinding blast furnace water-quenched granulated slag, fly ash and calcium carbonate in a weight ratio of 25:6:6:0.5, and the specific surface area is 800-4000m2/kg。
The preparation method of the marine sulphoaluminate cement comprises the following steps:
(1) grinding the sulphoaluminate cement clinker, clinker sea sand, silica fume and granulated blast furnace slag powder by using a cement mill, so that the passing rate of the sulphoaluminate cement clinker passing through a 100-mesh sieve reaches more than 95 percent;
(2) adding modified nano calcium carbonate, a high-efficiency water reducing agent, an accelerating agent, an anti-cracking waterproof expanding agent, redispersible latex powder and modified graphene into the raw materials obtained in the step (1), and fully and uniformly mixing to obtain a semi-finished marine sulphoaluminate cement;
(3) conveying the semi-finished marine sulphoaluminate cement into a finished product homogenizing silo by using a lifter, and homogenizing air generated at the bottom of the homogenizing silo to obtain a finished marine sulphoaluminate cement. The screen allowance of the finished product, namely a 1.18mm screen, is 0.1 percent.
Example 3
The marine sulphoaluminate cement for rapid construction is prepared from the following raw materials in parts by weight: 60 parts of sulphoaluminate cement clinker, 10 parts of modified nano calcium carbonate, 0.2 part of high-efficiency water reducing agent, 8 parts of anti-cracking waterproof expanding agent, 5 parts of redispersible latex powder, 15 parts of clinker sea sand, 5 parts of silica fume, 10 parts of granulated blast furnace slag powder and 0.1 part of modified graphene.
The modified nano calcium carbonate is prepared by mixing dry nano calcium carbonate and SP-1800 polyester hyper-dispersant in a weight ratio of 10:1 and stirring for 30min at a constant temperature of 110 ℃.
The high-efficiency water reducing agent comprises modified melamine and a polycarboxylate water reducing agent, wherein the weight ratio of the modified melamine to the polycarboxylate water reducing agent is 1:2, and the fineness of the modified melamine is below 100 meshes.
The anti-cracking waterproof expanding agent is a GNA efficient anti-cracking waterproof expanding agent.
The redispersible latex powder is one of ethylene-vinyl acetate copolymer, vinyl acetate-vinyl versatate copolymer or acrylate-styrene copolymer.
The clinker sea sand is prepared by cleaning sea sand, drying, mixing the sea sand with rubber powder, ball-milling, treating at 180 ℃ for 2 hours, and standing; then crushing and grinding to obtain particles with the average particle size of less than 100 micrometers; mixing the obtained granules with EPS granules; and performing ball milling on the obtained mixture for 8 hours to obtain the composite material.
The granulated blast furnace slag micro powder is obtained by mixing and grinding blast furnace water-quenched granulated slag, fly ash and calcium carbonate in a weight ratio of 25:6:6:0.5, and the specific surface area is 800-4000m2/kg。
The preparation method of the marine sulphoaluminate cement comprises the following steps:
(1) grinding the sulphoaluminate cement clinker, clinker sea sand, silica fume and granulated blast furnace slag powder by using a cement mill, so that the passing rate of the sulphoaluminate cement clinker passing through a 100-mesh sieve reaches more than 95 percent;
(2) adding modified nano calcium carbonate, a high-efficiency water reducing agent, an anti-cracking waterproof expanding agent, redispersible latex powder and modified graphene into the raw materials obtained in the step (1), and fully and uniformly mixing to obtain a semi-finished marine sulphoaluminate cement;
(3) conveying the semi-finished marine sulphoaluminate cement into a finished product homogenizing silo by using a lifter, and homogenizing air generated at the bottom of the homogenizing silo to obtain a finished marine sulphoaluminate cement. The screen allowance of the finished product, namely a 1.18mm screen, is 0.2 percent.
Concrete was prepared and tested for properties using the finished marine sulphoaluminate cement from examples 1-3, with the following results:
the test results show that the marine sulphoaluminate cement has short setting time, high early strength and continuously increased later strength, and can meet the requirement of rapid construction in marine environment. The electric flux of the concrete prepared by the method is less than 800 ℃ in 3 days, the early durability is high, the quality requirement of the concrete with high durability is met, and the early chlorine salt erosion damage of the concrete can be effectively avoided; the electric flux is less than 600 ℃ in 28 days, the later durability is continuously increased, and the durability of resisting the corrosion of the chlorine salt is higher; namely, the marine anti-chlorine corrosion-resistant coating has excellent impermeability, durability and corrosion resistance, and is suitable for marine anti-chlorine corrosion environments.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (8)
1. The marine sulphoaluminate cement for rapid construction is characterized by being prepared from the following raw materials in parts by weight: 40-60 parts of sulphoaluminate cement clinker, 5-10 parts of modified nano calcium carbonate, 0.05-0.2 part of high-efficiency water reducing agent, 0-4 parts of accelerator, 6-8 parts of anti-cracking waterproof expanding agent, 3-5 parts of redispersible latex powder, 10-15 parts of clinker sea sand, 2-5 parts of silica fume, 6-10 parts of granulated blast furnace slag powder and 0.01-0.1 part of modified graphene;
the modified nano calcium carbonate is prepared by mixing dry nano calcium carbonate and SP-1800 polyester hyper-dispersant in a weight ratio of 10:1 and stirring for 30min at a constant temperature of 110 ℃.
2. The marine sulphoaluminate cement for rapid construction according to claim 1, wherein the high efficiency water reducing agent comprises modified melamine and polycarboxylic acid water reducing agent, the weight ratio of the modified melamine to the polycarboxylic acid water reducing agent is 1:2, and the fineness of the modified melamine is below 100 meshes.
3. The marine sulfoaluminate cement for rapid construction according to claim 1, wherein the setting accelerator is prepared from potassium metaaluminate, lithium metaaluminate and polyvinyl alcohol according to a mass ratio of 9-10: 1: 0.3-0.0.4, and the polyvinyl alcohol is sieved by a 200-mesh sieve.
4. The marine sulfoaluminate cement for rapid construction according to claim 1, wherein the anti-cracking waterproof expanding agent is GNA high-efficiency anti-cracking waterproof expanding agent.
5. The marine sulfoaluminate cement for rapid construction according to claim 1, wherein the redispersible latex powder is one of ethylene-vinyl acetate copolymer, vinyl acetate-vinyl versatate copolymer or acrylate-styrene copolymer.
6. The marine sulfoaluminate cement for rapid construction as claimed in claim 1, wherein the clinker sea sand is prepared by cleaning sea sand, drying, mixing sea sand with rubber powder, ball milling, treating at 160-; then crushing and grinding to obtain particles with the average particle size of less than 100 micrometers; mixing the obtained granules with EPS granules; and ball-milling the obtained mixture for 4-8h to obtain the product.
7. The marine sulfoaluminate cement for rapid construction as claimed in claim 1, wherein the granulated blast furnace slag micropowder is obtained by mixing and grinding blast furnace water-granulated slag, fly ash and calcium carbonate in a weight ratio of 25:6:6:0.5, and has a specific surface area of 800-4000m2/kg。
8. The marine sulfoaluminate cement for rapid construction according to claim 1, wherein the preparation method of the marine sulfoaluminate cement comprises the following steps:
(1) grinding the sulphoaluminate cement clinker, clinker sea sand, silica fume and granulated blast furnace slag powder by using a cement mill, so that the passing rate of the sulphoaluminate cement clinker passing through a 100-mesh sieve reaches more than 95 percent;
(2) adding modified nano calcium carbonate, a high-efficiency water reducing agent, an accelerating agent, an anti-cracking waterproof expanding agent, redispersible latex powder and modified graphene into the raw materials obtained in the step (1), and fully and uniformly mixing to obtain a semi-finished marine sulphoaluminate cement;
(3) conveying the semi-finished marine sulphoaluminate cement into a finished product homogenizing silo by using a lifter, and homogenizing air generated at the bottom of the homogenizing silo to obtain a finished marine sulphoaluminate cement.
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| CN112341127A (en) * | 2020-11-24 | 2021-02-09 | 广西云燕特种水泥建材有限公司 | Sludge curing agent and production method thereof |
| CN112341123A (en) * | 2020-11-24 | 2021-02-09 | 广西云燕特种水泥建材有限公司 | Seawater corrosion resistant ceramic tile binder and production method thereof |
| CN113443885A (en) * | 2020-07-10 | 2021-09-28 | 青岛理工大学 | Grouting material and preparation and application thereof |
| CN115490479A (en) * | 2022-09-27 | 2022-12-20 | 中德新亚建筑材料有限公司 | Ocean engineering concrete premix and preparation method thereof |
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| CN111875321B (en) * | 2020-07-02 | 2021-10-22 | 中铁桥研科技有限公司 | Underwater repair material based on seawater and coral sand and preparation method thereof |
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| CN112341127A (en) * | 2020-11-24 | 2021-02-09 | 广西云燕特种水泥建材有限公司 | Sludge curing agent and production method thereof |
| CN112341123A (en) * | 2020-11-24 | 2021-02-09 | 广西云燕特种水泥建材有限公司 | Seawater corrosion resistant ceramic tile binder and production method thereof |
| CN115490479A (en) * | 2022-09-27 | 2022-12-20 | 中德新亚建筑材料有限公司 | Ocean engineering concrete premix and preparation method thereof |
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