CN111362617B - Marine concrete admixture and preparation method thereof - Google Patents
Marine concrete admixture and preparation method thereof Download PDFInfo
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- CN111362617B CN111362617B CN201911408378.4A CN201911408378A CN111362617B CN 111362617 B CN111362617 B CN 111362617B CN 201911408378 A CN201911408378 A CN 201911408378A CN 111362617 B CN111362617 B CN 111362617B
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
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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
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Abstract
The invention relates to a marine concrete admixture and a preparation method thereof, wherein the admixture is composed of the following raw materials in parts by weight: 30-50 parts of sulphoaluminate cement clinker, 600 parts of manganese slag powder, 300 parts of smelting slag powder, 150 parts of ceramic powder, 20-30 parts of alpha microcrystalline gypsum powder, 3-4 parts of sodium methyl silicate, 2-5 parts of nano aluminum hydroxide, 8-10 parts of regulator, 0.3-0.8 part of water reducer and 1-2 parts of carbon nano tube; the marine concrete admixture has low water demand and high activity, and the chlorine ion permeability, frost resistance and erosion resistance of the concrete prepared by the admixture can be greatly improved, so that the seawater and sulfate erosion resistance of the concrete is obviously improved, and the marine concrete admixture is particularly suitable for marine environment concrete engineering.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a marine concrete admixture and a preparation method thereof.
Background
With the rapid development of national economy and the proposal of the strategy of ocean forcing, a plurality of infrastructure construction projects go from offshore to open sea or even deep sea, and the requirements of the projects on the erosion resistance and the durability of concrete materials and structures are higher and higher. The concrete in the marine environment is influenced by various factors such as salt fog, erosion media, sea wave scouring, atmosphere, water, temperature and the like for a long time, and the service life of the concrete can be greatly shortened. According to research, the marine effects on the destruction of concrete structures are mainly: freeze-thaw cycling action, reinforcing steel bar corrosion action, carbonization action, alkali-aggregate reaction, acid-base corrosion action, mechanical damage action of impact wear and the like, wherein the main damage reasons are reinforcing steel bar corrosion and salt corrosion. The concrete prepared by adopting the ordinary cement and the conventional admixture can not completely meet the requirement of high durability of ocean engineering, but the concrete prepared by adopting the special high-iron phase corrosion-resistant special cement has the problems of high cost and difficult control of construction time. In order to improve the durability of the marine engineering concrete structure and prolong the service life of the infrastructure, if the marine engineering concrete admixture with low cost can be prepared by adopting industrial solid wastes as main raw materials through an ultrafine grinding technology and a chemical excitation technology and the marine engineering concrete is prepared by compounding the marine engineering concrete admixture with ordinary portland cement, the shrinkage and hydration heat of the marine engineering concrete can be reduced, and the corrosion resistance, the chloride ion permeability resistance and other functions can be improved. The preparation cost of the marine concrete can be obviously reduced, the maintenance and repair cost of marine structures can be reduced, and the marine concrete has obvious economic and social benefits.
Disclosure of Invention
The invention aims to provide a marine concrete admixture and a preparation method thereof, and aims to solve the problem that the seawater corrosion resistance of concrete prepared from the common admixture and cement in the background art can not meet the high durability requirement of marine engineering.
In order to achieve the purpose, the invention provides the following technical scheme:
the marine concrete admixture is composed of the following raw materials in parts by weight: 30-50 parts of sulphoaluminate cement clinker, 600 parts of manganese slag powder, 300 parts of smelting slag powder, 150 parts of ceramic powder, 20-30 parts of alpha microcrystalline gypsum powder, 3-4 parts of sodium methyl silicate, 2-5 parts of nano aluminum hydroxide, 8-10 parts of regulator, 0.3-0.8 part of water reducer and 1-2 parts of carbon nano tube.
Further, the specific surface area of the sulphoaluminate cement clinker is 600-800m2Per kg; chemical components: aluminum oxide (Al)2O3)25-40 wt%, silicon dioxide (SiO)2)3-12 wt%, 35-45 wt% of calcium oxide (CaO), and ferric oxide (Fe)2O3)1-4 wt%, sulfur trioxide (SO)3)8-16 wt%, magnesium oxide (MgO)0.5-1.5 wt%, titanium dioxide (TiO)2)0.01-0.6 wt%, potassium oxide (K)2O)0.01-0.09 wt%, sodium oxide (Na)2O)0.01-0.1wt％。
Further, the specific surface area of the manganese slag powder is 800-1000m2The superfine powder per kg comprises the following chemical components: silicon dioxide (SiO)2)40-42 wt% of aluminum oxide (Al)2O3)10-12 wt% of ferric oxide (Fe)2O3)8-10 wt%, calcium oxide (CaO)25-28 wt%, manganese oxide (MnO)6-7 wt%, sulfur trioxide (SO)3)0 to 0.05 wt%, potassium oxide (K)2O)0-0.05 wt%, sodium oxide (Na)2O)0 to 0.06 wt%, the remainder being other impurities.
Further, the specific surface area of the smelting slag powder is 805-850m2The superfine powder per kg comprises the following chemical components: silicon dioxide (SiO)2)25-27 wt% of aluminum oxide (Al)2O3)9-10 wt%, iron (Fe) oxide2O3)18-19 wt%, calcium oxide (CaO)36-37 wt%, magnesium oxide (MgO)4-5 wt%, potassium oxide (K)2O)0.06-0.07 wt%, sodium oxide (Na)2O)0.07-0.08 wt%, the remainder being other impurities.
Further, the specific surface area of the ceramic powder is 1000-1200m2The superfine powder per kg comprises the following chemical components: silicon dioxide (SiO)2)40-45 wt% of aluminum oxide (Al)2O3)30-35 wt% of ferric oxide (Fe)2O3)2-3 wt%, calcium oxide (CaO)8-10 wt%, magnesium oxide (MgO)1-3 wt%, potassium oxide (K)2O)0-0.02 wt%, sodium oxide (Na)2O)0.01-0.03 wt%, the remainder being other impurities.
Further, the specific surface area of the alpha microcrystalline gypsum powder is 800-850m2Per kg, the content of alpha type calcium sulfate hemihydrate is not less than 95%.
Furthermore, the solid content of the sodium methylsilicate is more than or equal to 30 percent, and the pH value is 12-13.
Further, the purity of the nano aluminum hydroxide reaches 99.99 percent, the average particle size is 20nm, and the specific surface area is 180000-240000m2/kg。
Further, the regulator consists of the following raw materials in parts by weight: 8-9 parts of sulfonated melamine formaldehyde resin, 16-18 parts of acrylic glycidyl ether, 25-28 parts of polymeric aluminum ferric silicate and 18-19 parts of phosphite ester.
Further, the water reducing agent is a powder water reducing agent and is composed of the following raw materials in parts by weight: 1-2 parts of polydimethylsiloxane, 1-2 parts of ethylene glycol siloxane, 2-3 parts of sodium dodecyl benzene sulfonate and 18-20 parts of melamine formaldehyde polycondensate.
Further, the diameter of the carbon nano tube is 2-100nm, and the length is 500-800 nm.
The invention also provides a preparation method of the marine concrete admixture, which comprises the following steps:
(1) adding 20-30 parts of alpha microcrystalline gypsum powder, 2-5 parts of nano aluminum hydroxide, 8-10 parts of regulator, 0.3-0.8 part of water reducing agent and 1-2 parts of carbon nano tube into a homogenizer A for homogenizing and stirring, and adding 3-4 parts of sodium methyl silicate in an internal spraying manner during homogenizing and stirring to obtain a mixture A; the rotation speed of the homogenizer is 1700 plus 1800r/min, and the uniform stirring is carried out for 6-8 min;
(2) adding 30-50 parts of sulphoaluminate cement clinker, 600 parts of manganese slag powder 500-; the rotation speed of the homogenizer is 200 and 250r/min, and the uniform stirring is carried out for 6-7 min;
(3) adding the mixture A obtained from P1 into a homogenizer B and a mixture B obtained from P2, homogenizing and stirring at the rotation speed of the homogenizer of 200 and 250r/min, and uniformly stirring for 4-5 min; thus obtaining the marine concrete admixture.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can utilize industrial solid wastes such as manganese slag, smelting slag, ceramic powder and the like on a large scale, greatly reduces the manufacturing cost of the marine concrete admixture, reduces the environmental pollution, and is economic and environment-friendly.
2. In the preparation process, superfine sulphoaluminate cement clinker, manganese slag powder, smelting slag powder, ceramic powder, alpha microcrystalline gypsum powder and the like with specific mineral compositions or chemical compositions are added, so that the reaction activity and the excitation effect of each component can be greatly improved, and the filling effect on cement particles is more obvious; in addition, the added nano aluminum hydroxide, the carbon nano tube and the sodium methyl silicate can promote depolymerization and repolymerization of the silicon-aluminum-oxygen tetrahedron of the industrial waste residue, so that the secondary reaction structure is more compact, the hydration product is more uniform, and the chloride ion permeability resistance, seawater corrosion resistance and sulfate corrosion resistance of the matrix are greatly improved.
3. By adding the regulator and the water reducing agent, the obtained marine concrete admixture has low water demand and good adaptability with other materials.
4. The marine concrete admixture has simple preparation process, and only needs to homogenize the sulphoaluminate cement clinker with certain fineness, the solid waste material and the additive, and the raw materials are cheap and easy to obtain, thereby having higher application value.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
Example 1
The marine concrete admixture is composed of the following raw materials in parts by weight: 30 parts of sulphoaluminate cement clinker, 500 parts of manganese slag powder, 200 parts of smelting slag powder, 100 parts of ceramic powder, 20 parts of alpha microcrystalline gypsum powder, 3 parts of sodium methyl silicate, 2 parts of nano aluminum hydroxide, 8 parts of regulator, 0.3 part of water reducer and 1 part of carbon nano tube.
The specific surface area of the sulphoaluminate cement clinker is 600-800m2Kg, mineral composition: 355-75 wt% of C4A, 15-30 wt% of C2S, 3-6 wt% of C4 AF; chemical components: aluminum oxide (Al)2O3)25-40 wt%, silicon dioxide (SiO)2)3-12 wt%, 35-45 wt% of calcium oxide (CaO), and ferric oxide (Fe)2O3)1-4 wt%, sulfur trioxide (SO)3)8-16 wt%, magnesium oxide (MgO)0.5-1.5 wt%, titanium dioxide (TiO)2)0.01-0.6 wt%, potassium oxide (K)2O)0.01-0.09 wt%, sodium oxide (Na)2O)0.01-0.1wt％。
The specific surface area of the manganese slag powder is 800-1000m2Ultra-fine/kgMicro powder, chemical components: silicon dioxide (SiO)2)40-42 wt% of aluminum oxide (Al)2O3)10-12 wt% of ferric oxide (Fe)2O3)8-10 wt%, calcium oxide (CaO)25-28 wt%, manganese oxide (MnO)6-7 wt%, sulfur trioxide (SO)3)0 to 0.05 wt%, potassium oxide (K)2O)0-0.05 wt%, sodium oxide (Na)2O)0 to 0.06 wt%, the remainder being other impurities.
The specific surface area of the smelting slag powder is 805-850m2The superfine powder per kg comprises the following chemical components: silicon dioxide (SiO)2)25-27 wt% of aluminum oxide (Al)2O3)9-10 wt%, iron (Fe) oxide2O3)18-19 wt%, calcium oxide (CaO)36-37 wt%, magnesium oxide (MgO)4-5 wt%, potassium oxide (K)2O)0.06-0.07 wt%, sodium oxide (Na)2O)0.07-0.08 wt%, the remainder being other impurities.
The specific surface area of the ceramic powder is 1000-1200m2The superfine powder per kg comprises the following chemical components: silicon dioxide (SiO)2)40-45 wt% of aluminum oxide (Al)2O3)30-35 wt% of ferric oxide (Fe)2O3)2-3 wt%, calcium oxide (CaO)8-10 wt%, magnesium oxide (MgO)1-3 wt%, potassium oxide (K)2O)0-0.02 wt%, sodium oxide (Na)2O)0.01-0.03 wt%, the remainder being other impurities.
The specific surface area of the alpha microcrystalline gypsum powder is 800-850m2Per kg, the content of alpha type calcium sulfate hemihydrate is not less than 95%.
The solid content of the sodium methylsilicate is more than or equal to 30 percent, and the PH value is 12-13.
The purity of the nano aluminum hydroxide reaches 99.99 percent, the average particle size is 20nm, and the specific surface area is 180000-240000m2/kg。
The regulator consists of the following raw materials in parts by weight: 8 parts of sulfonated melamine formaldehyde resin, 16 parts of acrylic glycidyl ether, 25 parts of polymeric aluminum ferric silicate and 18 parts of phosphite ester.
The water reducing agent is a powder water reducing agent and is composed of the following raw materials in parts by weight: 1 part of polydimethylsiloxane, 1 part of ethylene glycol siloxane, 2 parts of sodium dodecyl benzene sulfonate and 18 parts of melamine formaldehyde polycondensate.
The diameter of the carbon nano tube is 2-100nm, and the length is 500-800 nm.
Example 1 a method of making a marine concrete admixture, comprising the steps of:
(1) adding 20 parts of alpha microcrystalline gypsum powder, 2 parts of nano aluminum hydroxide, 8 parts of regulator, 0.3 part of water reducer and 1 part of carbon nano tube into a homogenizer A for homogenizing and stirring, and adding 3 parts of sodium methyl silicate in an internal spraying manner during homogenizing and stirring to obtain a mixture A; the rotation speed of the homogenizer is 1700 plus 1800r/min, and the uniform stirring is carried out for 6-8 min;
(2) adding 30 parts of sulphoaluminate cement clinker, 500 parts of manganese slag powder, 200 parts of smelting slag powder and 100 parts of ceramic powder into a homogenizer B for homogenizing and stirring to obtain a mixture B; the rotation speed of the homogenizer is 200 and 250r/min, and the uniform stirring is carried out for 6-7 min;
(3) adding the mixture A obtained from P1 into a homogenizer B and a mixture B obtained from P2, homogenizing and stirring at the rotation speed of the homogenizer of 200 and 250r/min, and uniformly stirring for 4-5 min; thus obtaining the marine concrete admixture.
Example 2
The marine concrete admixture is composed of the following raw materials in parts by weight: 50 parts of sulphoaluminate cement clinker, 600 parts of manganese slag powder, 300 parts of smelting slag powder, 150 parts of ceramic powder, 30 parts of alpha microcrystalline gypsum powder, 4 parts of sodium methyl silicate, 5 parts of nano aluminum hydroxide, 10 parts of regulator, 0.8 part of water reducer and 2 parts of carbon nano tube.
The specific surface area of the sulphoaluminate cement clinker is 600-800m2Kg, mineral composition: 355-75 wt% of C4A, 15-30 wt% of C2S, 3-6 wt% of C4 AF; chemical components: aluminum oxide (Al)2O3)25-40 wt%, silicon dioxide (SiO)2)3-12 wt%, 35-45 wt% of calcium oxide (CaO), and ferric oxide (Fe)2O3)1-4 wt%, sulfur trioxide (SO)3)8-16 wt%, magnesium oxide (MgO)0.5-1.5 wt%, titanium dioxide (TiO)2)0.01-0.6 wt%, potassium oxide (K)2O)0.01-0.09 wt%, sodium oxide (Na)2O)0.01-0.1wt％。
The specific surface area of the manganese slag powder is 800-1000m2/kg of superfine powder, andchemical components: silicon dioxide (SiO)2)40-42 wt% of aluminum oxide (Al)2O3)10-12 wt% of ferric oxide (Fe)2O3)8-10 wt%, calcium oxide (CaO)25-28 wt%, manganese oxide (MnO)6-7 wt%, sulfur trioxide (SO)3)0 to 0.05 wt%, potassium oxide (K)2O)0-0.05 wt%, sodium oxide (Na)2O)0 to 0.06 wt%, the remainder being other impurities.
The specific surface area of the smelting slag powder is 805-850m2The superfine powder per kg comprises the following chemical components: silicon dioxide (SiO)2)25-27 wt% of aluminum oxide (Al)2O3)9-10 wt%, iron (Fe) oxide2O3)18-19 wt%, calcium oxide (CaO)36-37 wt%, magnesium oxide (MgO)4-5 wt%, potassium oxide (K)2O)0.06-0.07 wt%, sodium oxide (Na)2O)0.07-0.08 wt%, the remainder being other impurities.
The specific surface area of the ceramic powder is 1000-1200m2The superfine powder per kg comprises the following chemical components: silicon dioxide (SiO)2)40-45 wt% of aluminum oxide (Al)2O3)30-35 wt% of ferric oxide (Fe)2O3)2-3 wt%, calcium oxide (CaO)8-10 wt%, magnesium oxide (MgO)1-3 wt%, potassium oxide (K)2O)0-0.02 wt%, sodium oxide (Na)2O)0.01-0.03 wt%, the remainder being other impurities.
The specific surface area of the alpha microcrystalline gypsum powder is 800-850m2Per kg, the content of alpha type calcium sulfate hemihydrate is not less than 95%.
The solid content of the sodium methylsilicate is more than or equal to 30 percent, and the PH value is 12-13.
The purity of the nano aluminum hydroxide reaches 99.99 percent, the average particle size is 20nm, and the specific surface area is 180000-240000m2/kg。
The regulator consists of the following raw materials in parts by weight: 9 parts of sulfonated melamine formaldehyde resin, 18 parts of acrylic glycidyl ether, 28 parts of polymeric aluminum ferric silicate and 19 parts of phosphite ester.
The water reducing agent is a powder water reducing agent and is composed of the following raw materials in parts by weight: 2 parts of polydimethylsiloxane, 2 parts of ethylene glycol siloxane, 3 parts of sodium dodecyl benzene sulfonate and 20 parts of melamine formaldehyde polycondensate.
The diameter of the carbon nano tube is 2-100nm, and the length is 500-800 nm.
Example 2 a method of making a marine concrete admixture, comprising the steps of:
(1) adding 30 parts of alpha microcrystalline gypsum powder, 5 parts of nano aluminum hydroxide, 10 parts of regulator, 0.8 part of water reducer and 2 parts of carbon nano tube into a homogenizer A for homogenizing and stirring, and adding 4 parts of sodium methyl silicate in an internal spraying manner during homogenizing and stirring to obtain a mixture A; the rotation speed of the homogenizer is 1700 plus 1800r/min, and the uniform stirring is carried out for 6-8 min;
(2) adding 50 parts of sulphoaluminate cement clinker, 600 parts of manganese slag powder, 300 parts of smelting slag powder and 150 parts of ceramic powder into a homogenizer B for homogenizing and stirring to obtain a mixture B; the rotation speed of the homogenizer is 200 and 250r/min, and the uniform stirring is carried out for 6-7 min;
(3) adding the mixture A obtained from P1 into a homogenizer B and a mixture B obtained from P2, homogenizing and stirring at the rotation speed of the homogenizer of 200 and 250r/min, and uniformly stirring for 4-5 min; thus obtaining the marine concrete admixture.
Example 3
The marine concrete admixture is composed of the following raw materials in parts by weight: 40 parts of sulphoaluminate cement clinker, 560 parts of manganese slag powder, 270 parts of smelting slag powder, 130 parts of ceramic powder, 25 parts of alpha microcrystalline gypsum powder, 3.5 parts of sodium methylsilicate, 3 parts of nano aluminum hydroxide, 8.8 parts of regulator, 0.5 part of water reducing agent and 1.5 parts of carbon nano tube.
The specific surface area of the sulphoaluminate cement clinker is 600-800m2Kg, mineral composition: 355-75 wt% of C4A, 15-30 wt% of C2S, 3-6 wt% of C4 AF; chemical components: aluminum oxide (Al)2O3)25-40 wt%, silicon dioxide (SiO)2)3-12 wt%, 35-45 wt% of calcium oxide (CaO), and ferric oxide (Fe)2O3)1-4 wt%, sulfur trioxide (SO)3)8-16 wt%, magnesium oxide (MgO)0.5-1.5 wt%, titanium dioxide (TiO)2)0.01-0.6 wt%, potassium oxide (K)2O)0.01-0.09 wt%, sodium oxide (Na)2O)0.01-0.1wt％。
The specific surface area of the manganese slag powder is 800-1000m2/kg of ultrafine powder, chemical compositionDividing into: silicon dioxide (SiO)2)40-42 wt% of aluminum oxide (Al)2O3)10-12 wt% of ferric oxide (Fe)2O3)8-10 wt%, calcium oxide (CaO)25-28 wt%, manganese oxide (MnO)6-7 wt%, sulfur trioxide (SO)3)0 to 0.05 wt%, potassium oxide (K)2O)0-0.05 wt%, sodium oxide (Na)2O)0 to 0.06 wt%, the remainder being other impurities.
The specific surface area of the smelting slag powder is 805-850m2The superfine powder per kg comprises the following chemical components: silicon dioxide (SiO)2)25-27 wt% of aluminum oxide (Al)2O3)9-10 wt%, iron (Fe) oxide2O3)18-19 wt%, calcium oxide (CaO)36-37 wt%, magnesium oxide (MgO)4-5 wt%, potassium oxide (K)2O)0.06-0.07 wt%, sodium oxide (Na)2O)0.07-0.08 wt%, the remainder being other impurities.
The specific surface area of the ceramic powder is 1000-1200m2The superfine powder per kg comprises the following chemical components: silicon dioxide (SiO)2)40-45 wt% of aluminum oxide (Al)2O3)30-35 wt% of ferric oxide (Fe)2O3)2-3 wt%, calcium oxide (CaO)8-10 wt%, magnesium oxide (MgO)1-3 wt%, potassium oxide (K)2O)0-0.02 wt%, sodium oxide (Na)2O)0.01-0.03 wt%, the remainder being other impurities.
The specific surface area of the alpha microcrystalline gypsum powder is 800-850m2Per kg, the content of alpha type calcium sulfate hemihydrate is not less than 95%.
The solid content of the sodium methylsilicate is more than or equal to 30 percent, and the PH value is 12-13.
The purity of the nano aluminum hydroxide reaches 99.99 percent, the average particle size is 20nm, and the specific surface area is 180000-240000m2/kg。
The regulator consists of the following raw materials in parts by weight: 8.5 parts of sulfonated melamine formaldehyde resin, 17 parts of acrylic glycidyl ether, 27 parts of polymeric aluminum ferric silicate and 18.5 parts of phosphite ester.
The water reducing agent is a powder water reducing agent and is composed of the following raw materials in parts by weight: 1.5 parts of polydimethylsiloxane, 1.5 parts of ethylene glycol siloxane, 2.5 parts of sodium dodecyl benzene sulfonate and 19 parts of melamine formaldehyde polycondensate.
The diameter of the carbon nano tube is 2-100nm, and the length is 500-800 nm.
Example 3 a method of making a marine concrete admixture, comprising the steps of:
(1) adding 25 parts of alpha microcrystalline gypsum powder, 3 parts of nano aluminum hydroxide, 8.8 parts of regulator, 0.5 part of water reducer and 1.5 parts of carbon nano tube into a homogenizer A for homogenizing and stirring, and adding 3.5 parts of sodium methyl silicate in an internal spraying manner during homogenizing and stirring to obtain a mixture A; the rotation speed of the homogenizer is 1700 plus 1800r/min, and the uniform stirring is carried out for 6-8 min;
(2) adding 40 parts of sulphoaluminate cement clinker, 560 parts of manganese slag powder, 270 parts of smelting slag powder and 130 parts of ceramic powder into a homogenizer B for homogenizing and stirring to obtain a mixture B; the rotation speed of the homogenizer is 200 and 250r/min, and the uniform stirring is carried out for 6-7 min;
(3) adding the mixture A obtained from P1 into a homogenizer B and a mixture B obtained from P2, homogenizing and stirring at the rotation speed of the homogenizer of 200 and 250r/min, and uniformly stirring for 4-5 min; thus obtaining the marine concrete admixture.
Comparative example 1
The difference from the example 3 is that the manganese slag powder, the smelting slag powder and the ceramic powder used in the comparative example 1 are all commercial common powder which is not subjected to superfine grinding, and the specific surface area is 400-500m2/kg。
Comparative example 2
The difference from example 3 is that the aluminum hydroxide used in comparative example 2 is non-nanoscale aluminum hydroxide.
Comparative example 3
Unlike example 3, comparative example 3 does not use sodium methyl silicate.
Comparative example 4
The difference from example 3 is that comparative example 4 does not use carbon nanotubes.
Comparative example 5
Comparative example 5 is a blank control without marine concrete admixture.
And (3) performance testing:
the concrete with the same mixing ratio of C40 was used as the test object, wherein the addition amount of the marine concrete admixture in the inventive examples 1-3 and the comparative examples 1-4 in the concrete was 40% of the total amount of the cementitious material in the concrete, and the comparative example 5 was a blank control group.
1. Testing of influence of working performance, mechanical property and corrosion resistance
Working performance, mechanical property and corrosion resistance are tested according to GB/T50080-2016 standard on test method for common concrete mixture performance, GB/T50081-2016 standard on test method for common concrete mechanical property, GB/T50082-2009 standard on test method for long-term performance and durability of common concrete and GB/T749-2008 method for test method for sulfate corrosion resistance of cement.
Table 1:
as can be seen from Table 1, the concrete added with the marine concrete admixture of the embodiments 1-3 of the present invention has good working performance and high strength retention rate; the electric flux and the chloride ion diffusion coefficient are obviously lower than those of a blank control group, and the sulfate erosion resistance coefficient is greatly improved; the effect is better than that of the concrete in the comparative examples 1-5, and therefore, the corrosion resistance of the marine concrete can be effectively improved by adding the nano aluminum hydroxide, the sodium methyl silicate and the carbon nano tube into the industrial solid waste raw materials in the marine concrete admixture through the ultrafine grinding.
2. Test of freeze-thaw cycle and soaking-drying cycle
The freeze-thaw cycle and the soaking and drying cycle experiments are tested according to GB/T50082-2009 Standard test method for long-term performance and durability of common concrete.
Table 2:
as can be seen from table 2, the admixture for marine concrete in examples 1 to 3 of the present invention can effectively increase the times of freeze thawing resistance and soaking and drying cycle of marine concrete, and are better than those in comparative examples 1 to 5, it can be seen that the performance of the admixture for marine concrete can be effectively improved by adding nano aluminum hydroxide, sodium methyl silicate and carbon nanotubes to the industrial solid waste raw materials in the admixture for marine concrete through ultra-fine grinding, and the prepared admixture for marine concrete has better environmental adaptability.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. The marine concrete admixture is characterized by comprising the following raw materials in parts by weight: 30-50 parts of sulphoaluminate cement clinker, 600 parts of manganese slag powder, 300 parts of smelting slag powder, 150 parts of ceramic powder, 20-30 parts of alpha microcrystalline gypsum powder, 3-4 parts of sodium methyl silicate, 2-5 parts of nano aluminum hydroxide, 8-10 parts of regulator, 0.3-0.8 part of water reducer and 1-2 parts of carbon nano tube;
the specific surface area of the sulphoaluminate cement clinker is 600-800m2Per kg; chemical components: aluminum oxide (Al)2O3)25-40 wt%, silicon dioxide (SiO)2)3-12 wt%, 35-45 wt% of calcium oxide (CaO), and ferric oxide (Fe)2O3)1-4 wt%, sulfur trioxide (SO)3)8-16 wt%, magnesium oxide (MgO)0.5-1.5 wt%, titanium dioxide (TiO)2)0.01-0.6 wt%, potassium oxide (K)2O)0.01-0.09 wt%, sodium oxide (Na)2O)0.01 to 0.1 wt%; the specific surface area of the manganese slag powder is 800-1000m2The superfine powder per kg comprises the following chemical components: silicon dioxide (SiO)2)40-42 wt% of aluminum oxide (Al)2O3)10-12 wt% of ferric oxide (Fe)2O3)8-10 wt%, calcium oxide (CaO)25-28 wt%, manganese oxide (MnO)6-7 wt%, sulfur trioxide (SO)3)0 to 0.05 wt%, potassium oxide (K)2O)0-0.05 wt%, sodium oxide (Na)2O)0 to 0.06 wt%, the remainder being other impurities;
the specific surface area of the smelting slag powder is 805-850m2The superfine powder per kg comprises the following chemical components: silicon dioxide(SiO2)25-27 wt% of aluminum oxide (Al)2O3)9-10 wt%, iron (Fe) oxide2O3)18-19 wt%, calcium oxide (CaO)36-37 wt%, magnesium oxide (MgO)4-5 wt%, potassium oxide (K)2O)0.06-0.07 wt%, sodium oxide (Na)2O)0.07-0.08 wt%, the remainder being other impurities;
the specific surface area of the ceramic powder is 1000-1200m2The superfine powder per kg comprises the following chemical components: silicon dioxide (SiO)2)40-45 wt% of aluminum oxide (Al)2O3)30-35 wt% of ferric oxide (Fe)2O3)2-3 wt%, calcium oxide (CaO)8-10 wt%, magnesium oxide (MgO)1-3 wt%, potassium oxide (K)2O)0-0.02 wt%, sodium oxide (Na)2O)0.01-0.03 wt%, the rest is other impurities;
the regulator consists of the following raw materials in parts by weight: 8-9 parts of sulfonated melamine formaldehyde resin, 16-18 parts of acrylic glycidyl ether, 25-28 parts of polymeric aluminum ferric silicate and 18-19 parts of phosphite ester;
the water reducing agent is a powder water reducing agent and is composed of the following raw materials in parts by weight: 1-2 parts of polydimethylsiloxane, 1-2 parts of ethylene glycol siloxane, 2-3 parts of sodium dodecyl benzene sulfonate and 18-20 parts of melamine formaldehyde polycondensate.
2. The admixture for marine concrete as claimed in claim 1, wherein said alpha microcrystalline gypsum powder has a specific surface area of 800-2Per kg, the content of alpha type calcium sulfate hemihydrate is not less than 95%.
3. The admixture for marine concrete as claimed in claim 1, wherein said sodium methylsilicate has a solid content of 30% or more and a pH of 12-13.
4. The admixture for marine concrete as claimed in claim 1, wherein said nano aluminum hydroxide has a purity of 99.99%, an average particle size of 20nm, a specific surface area of 180000-240000m2/kg。
5. The admixture for marine concrete as defined in claim 1, wherein said carbon nanotubes have a diameter of 2-100nm and a length of 500-800 nm.
6. The method for preparing a marine concrete admixture according to any one of claims 1 to 5, comprising the steps of:
(1) adding 20-30 parts of alpha microcrystalline gypsum powder, 2-5 parts of nano aluminum hydroxide, 8-10 parts of regulator, 0.3-0.8 part of water reducing agent and 1-2 parts of carbon nano tube into a homogenizer A for homogenizing and stirring, and adding 3-4 parts of sodium methyl silicate in an internal spraying manner during homogenizing and stirring to obtain a mixture A; the rotation speed of the homogenizer is 1700 plus 1800r/min, and the uniform stirring is carried out for 6-8 min;
(2) adding 30-50 parts of sulphoaluminate cement clinker, 600 parts of manganese slag powder 500-; the rotation speed of the homogenizer is 200 and 250r/min, and the uniform stirring is carried out for 6-7 min;
(3) adding the mixture A obtained in the step (1) into a homogenizer B and the mixture B obtained in the step (2) for homogenizing and stirring, wherein the rotating speed of the homogenizer is 200-; thus obtaining the marine concrete admixture.
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| KR20130061449A (en) * | 2011-12-01 | 2013-06-11 | 대림산업 주식회사 | Mineral admixture for concrete strength promotion, and high early strength type marine concrete containing the same |
| CN104591623A (en) * | 2015-01-06 | 2015-05-06 | 安徽省无为县泉塘预制厂 | Concrete special for marine environment |
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| CN101508557A (en) * | 2009-04-09 | 2009-08-19 | 中国铁道科学研究院铁道建筑研究所 | Blending material for high-early-strength concrete |
| KR20130061449A (en) * | 2011-12-01 | 2013-06-11 | 대림산업 주식회사 | Mineral admixture for concrete strength promotion, and high early strength type marine concrete containing the same |
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Application publication date: 20200703 Assignee: Guangxi Yuanming New Material Technology Co.,Ltd. Assignor: GUILIN University OF TECHNOLOGY Contract record no.: X2022450000146 Denomination of invention: A marine concrete admixture and its preparation method Granted publication date: 20220104 License type: Common License Record date: 20221123 Application publication date: 20200703 Assignee: Guilin Yuanming Technology Co.,Ltd. Assignor: GUILIN University OF TECHNOLOGY Contract record no.: X2022450000148 Denomination of invention: A marine concrete admixture and its preparation method Granted publication date: 20220104 License type: Common License Record date: 20221123 |