CN116715464B - Composite ultrafine powder and underwater non-dispersed concrete containing same - Google Patents
Composite ultrafine powder and underwater non-dispersed concrete containing same Download PDFInfo
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- CN116715464B CN116715464B CN202310697935.9A CN202310697935A CN116715464B CN 116715464 B CN116715464 B CN 116715464B CN 202310697935 A CN202310697935 A CN 202310697935A CN 116715464 B CN116715464 B CN 116715464B
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- 239000000843 powder Substances 0.000 title claims abstract description 65
- 239000004567 concrete Substances 0.000 title claims abstract description 53
- 239000002131 composite material Substances 0.000 title claims abstract description 51
- 239000002893 slag Substances 0.000 claims abstract description 55
- 238000000227 grinding Methods 0.000 claims abstract description 38
- 239000002994 raw material Substances 0.000 claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- 239000010881 fly ash Substances 0.000 claims abstract description 19
- 239000010902 straw Substances 0.000 claims abstract description 15
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 14
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 12
- 235000019738 Limestone Nutrition 0.000 claims abstract description 11
- 239000006028 limestone Substances 0.000 claims abstract description 11
- 240000008042 Zea mays Species 0.000 claims abstract description 7
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims abstract description 7
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims abstract description 7
- 235000005822 corn Nutrition 0.000 claims abstract description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 238000002156 mixing Methods 0.000 claims description 40
- 239000000203 mixture Substances 0.000 claims description 38
- 239000003638 chemical reducing agent Substances 0.000 claims description 16
- 239000004568 cement Substances 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 9
- 229920002401 polyacrylamide Polymers 0.000 claims description 9
- 239000002202 Polyethylene glycol Substances 0.000 claims description 8
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 8
- SLINHMUFWFWBMU-UHFFFAOYSA-N Triisopropanolamine Chemical compound CC(O)CN(CC(C)O)CC(C)O SLINHMUFWFWBMU-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 229920001223 polyethylene glycol Polymers 0.000 claims description 8
- 229910021487 silica fume Inorganic materials 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000008394 flocculating agent Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000004566 building material Substances 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 6
- 239000002270 dispersing agent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- 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
- 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
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0042—Powdery mixtures
-
- 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
-
- 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
-
- 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
-
- 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
- C04B2111/74—Underwater applications
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of building materials, in particular to composite ultrafine powder and underwater non-dispersed concrete containing the same, wherein the composite ultrafine powder comprises the following component raw materials in parts by mass: 30-50 parts of steel slag, 20-30 parts of slag, 5-9 parts of fly ash, 1-5 parts of lithium slag, 2-4 parts of limestone, 5-10 parts of modified straw and 1-10 parts of grinding aid, wherein the modified straw is obtained by modifying corn straw through sodium carbonate.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to composite ultrafine powder and underwater non-dispersed concrete containing the same.
Background
Along with the development and construction of resources such as offshore and deepwater in China, the underwater engineering is increasingly increased, and the common concrete has the defects of large loss of cementing materials, poor dispersion resistance, low land-water strength ratio and the like in water environment, so that the requirements of the underwater engineering cannot be met. The underwater non-dispersive concrete is a new generation of underwater engineering material with relatively high water-to-land strength ratio and high dispersion resistance by adding dispersant (flocculant) based on common concrete "
The steel slag is industrial waste produced in the production process of the steelmaking industry, is a mineral admixture with lower activity, and has the comprehensive utilization rate of only about 30 percent. The steel slag yield in China is large, the utilization rate is low, a large amount of steel slag is continuously generated, a large amount of steel slag tailings cannot be effectively utilized and piled up, and the steel slag activity is low, so that the consumption of the steel slag is always small in the aspects of cement raw material, cement mixture or concrete admixture and the like, and the recycling utilization rate is always low.
Chinese patent No. CN114605120B discloses an underwater non-dispersed concrete and a method for preparing the same, the underwater non-dispersed concrete comprising: cement, sand, stone, pulverized coal, a water reducing agent, a composite anti-dispersant and water; the composite anti-dispersant consists of polyacrylamide, humic acid, kaolin and polysaccharide. The invention improves the consumption of each component of the concrete raw material and the anti-dispersant, improves the anti-scouring capability of the concrete, ensures that the underwater loss rate is not higher than 1.0 percent when the water flow rate is 0.8m/s, has good fluidity, and ensures the requirements of conduit construction, but the pulverized coal powder is greatly used for improving the fluidity of the concrete due to the unique morphological characteristics, so that the supply of high-quality pulverized coal ash on the market is not required, the use of steel slag to replace the pulverized coal ash is a good choice, but the early hydration activity of the steel slag is not high, the grindability is lower, and the problems of poor anti-dispersing performance and low water-land strength ratio can be caused when the invention is applied to the underwater non-dispersible concrete.
Disclosure of Invention
In view of the above, the invention aims to provide composite ultrafine powder and underwater non-dispersive concrete containing the same, so as to solve the problems of poor dispersion resistance and low water-to-land strength ratio caused by the application of steel slag to underwater non-dispersive concrete.
Based on the purposes, the invention provides composite ultrafine powder, which comprises the following raw materials in parts by weight: 30-50 parts of steel slag, 20-30 parts of slag, 5-9 parts of fly ash, 1-5 parts of lithium slag, 2-4 parts of limestone, 5-10 parts of modified straw and 1-10 parts of grinding aid.
The grinding aid comprises the following raw materials in parts by weight: 5-7 parts of triethanolamine, 2-4 parts of triisopropanolamine, 30-50 parts of silica fume, 10-15 parts of polyethylene glycol and 50-70 parts of water.
The preparation method of the modified straw comprises the following steps: mixing the crushed and ground corn stalks with a 50-100-mesh sieve and a 20wt% sodium carbonate solution in a solid-liquid mass ratio of 5-10:10-25, stirring at 95-100 ℃ for reaction for 60-80 hours, filtering after the reaction is finished, and drying the filtered solid at 50-60 ℃ for 5-7 hours to obtain the modified stalks.
Wherein the specific surface area of the composite ultrafine powder is not less than 1000cm 2 /g。
Wherein the density of the steel slag is 3-5kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The density of the slag is 2-4kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The density of the lithium slag is 2-4kg/m 3 。
Wherein the fly ash is one or a mixture of more of primary fly ash, secondary fly ash and tertiary fly ash.
The preparation method of the composite ultrafine powder comprises the following steps:
s1: placing steel slag, fly ash, lithium slag, limestone and modified straw in a drying oven at 95-105 ℃ according to the mass ratio of the raw materials, drying to constant weight, and grinding for 1h by using a ball mill to prepare raw material powder;
s2: adding raw material powder and grinding aid into a ball mill, uniformly mixing, and grinding until the specific surface area is not less than 1000cm 2 And/g, obtaining the composite ultrafine powder.
Furthermore, the invention also provides underwater non-dispersed concrete containing the composite ultrafine powder, which comprises the following raw materials in parts by mass: 45-65 parts of cement, 60-80 parts of river sand, 100-120 parts of cobble, 10-25 parts of composite ultrafine powder, 0.5-1 part of water reducer, 1.2-2 parts of flocculant and 18-22 parts of water.
Wherein the water reducer is a polycarboxylic acid high-efficiency water reducer.
Wherein the flocculant is polyacrylamide.
The preparation method of the underwater non-dispersed concrete comprises the following steps:
s3: mixing cement, a water reducing agent and a flocculating agent according to the mass ratio of raw materials to obtain a mixture;
s4: adding river sand, cobble and composite superfine powder into the mixture for mixing to obtain a mixture;
s5: adding water into the mixture, and mixing to obtain the underwater non-dispersed concrete.
Furthermore, the invention also provides application of the underwater undispersed concrete in underwater construction engineering.
The composite ultrafine powder and the underwater non-dispersed concrete containing the same provided by the invention have the following technical effects:
(1) Improving the mechanical properties of the underwater undispersed concrete: the addition of the composite ultrafine powder can improve the strength and durability of the concrete, thereby improving the mechanical property and durability of the underwater undispersed concrete.
(2) Improving the anti-dispersion performance of the underwater non-dispersion concrete: the dispersion performance of the steel slag can be improved and the precipitation and uneven dispersion of the steel slag in an underwater environment can be reduced by adding the grinding aid and the modified straw into the composite ultrafine powder.
(3) The strength ratio of water to land is reduced: the application of the steel slag can cause the problem of low water-to-land strength ratio, and the addition of the composite ultrafine powder can effectively relieve the problem and improve the water-to-land strength ratio, thereby improving the water erosion resistance of the underwater concrete.
In summary, the composite ultrafine powder and the underwater non-dispersed concrete containing the composite ultrafine powder can effectively improve the mechanical property and durability of the underwater concrete, reduce the influence of steel slag, improve the strength ratio of water and land, and have wide application prospect and economic benefit.
Detailed Description
The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.
The properties of the raw materials used in the specific embodiments of the present invention are as follows:
the steelThe density of the slag is 3.35kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The density of the slag is 2.69kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The density of the lithium slag is 2.98kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The model of the polycarboxylic acid high-efficiency water reducer is CP-1801X; the cement is conch P.O 42.5 ordinary Portland cement, the fineness modulus of river sand is 2.6, the grading of II areas is medium sand, the mud content is 5.5%, the stone is continuous grading of 10-20mm, and the mud content is less than or equal to 1%.
Example 1
(1) Mixing 5g of crushed and ground corn stalks with a 50-mesh sieve and 10g of sodium carbonate solution with the concentration of 20wt%, stirring and reacting for 60 hours at 95 ℃, filtering after the reaction is finished, and drying the filtered solid at 50 ℃ for 5 hours to obtain modified stalks;
(2) Placing 30g of steel slag, 20g of slag, 5g of tertiary fly ash, 1g of lithium slag, 2g of limestone and 5g of modified straw in a drying oven at 95 ℃ to be dried to constant weight, and grinding for 1h by using a ball mill to prepare raw material powder;
(3) Mixing 5g of triethanolamine, 2g of triisopropanolamine, 30g of silica fume, 10g of polyethylene glycol and 50g of water to obtain a grinding aid;
(4) Adding the raw material powder and 1g of grinding aid into a ball mill, uniformly mixing, and grinding until the specific surface area reaches 1069cm 2 And/g, obtaining composite ultrafine powder;
(5) 45g of cement, 0.5g of polycarboxylic acid high-efficiency water reducer and 1.2g of polyacrylamide are mixed to obtain a mixture;
(6) Adding 60g of river sand, 100g of cobble and 10g of composite ultrafine powder into the mixture for mixing to obtain a mixture;
(7) And adding 18g of water into the mixture, and mixing to obtain the underwater non-dispersed concrete.
Example 2
(1) Mixing 7g of corn stalks which are crushed and ground and pass through a 80-mesh sieve with 18g of sodium carbonate solution with the concentration of 20wt%, stirring and reacting for 70 hours at the temperature of 100 ℃, filtering after the reaction is finished, and drying the filtered solid at the temperature of 55 ℃ for 6 hours to obtain modified stalks;
(2) Placing 40g of steel slag, 25g of slag, 7g of tertiary fly ash, 3g of lithium slag, 3g of limestone and 7.5g of modified straw in a drying oven at 100 ℃ to be dried to constant weight, and grinding for 1h by using a ball mill to prepare raw material powder;
(3) Mixing 6g of triethanolamine, 3g of triisopropanolamine, 40g of silica fume, 12.5g of polyethylene glycol and 60g of water to obtain a grinding aid;
(4) Adding the raw material powder and 5g of grinding aid into a ball mill, uniformly mixing, and grinding until the specific surface area reaches 1024cm 2 And/g, obtaining composite ultrafine powder;
(5) Mixing 55g of cement, 0.7g of polycarboxylic acid high-efficiency water reducer and 1.6 parts of polyacrylamide to obtain a mixture;
(6) Adding 70g of river sand, 110g of cobble and 17g of composite ultrafine powder into the mixture for mixing to obtain a mixture;
(7) And adding 20g of water into the mixture, and mixing to obtain the underwater non-dispersed concrete.
Example 3
(1) 10g of corn stalks which are crushed and ground and pass through a 100-mesh sieve are mixed with 25g of sodium carbonate solution with the concentration of 20wt%, the mixture is stirred and reacted for 80 hours at the temperature of 100 ℃, after the reaction is finished, the mixture is filtered, and the filtered solid is dried for 7 hours at the temperature of 60 ℃ to obtain modified stalks;
(2) Placing 50g of steel slag, 30g of slag, 9g of tertiary fly ash, 5g of lithium slag, 4g of limestone and 10g of modified straw in a drying oven at 105 ℃ to be dried to constant weight, and grinding for 1h by using a ball mill to prepare raw material powder;
(3) 7g of triethanolamine, 4g of triisopropanolamine, 50g of silica fume, 15g of polyethylene glycol and 70g of water are mixed to obtain a grinding aid;
(4) Adding the raw material powder and 10g of grinding aid into a ball mill, uniformly mixing, and grinding until the specific surface area reaches 1076cm 2 And/g, obtaining composite ultrafine powder;
(5) Mixing 65g of cement, 1g of polycarboxylic acid high-efficiency water reducer and 2 parts of polyacrylamide to obtain a mixture;
(6) Adding 80g of river sand, 120g of cobble and 25g of composite ultrafine powder into the mixture for mixing to obtain a mixture;
(7) And adding 22g of water into the mixture, and mixing to obtain the underwater non-dispersed concrete.
Comparative example 1
(1) Placing 40g of steel slag, 25g of slag, 7g of tertiary fly ash, 3g of lithium slag, 3g of limestone and 7.5g of corn stalks which are crushed, ground and sieved by a 80-mesh sieve in a drying oven at 100 ℃ to be dried to constant weight, and grinding for 1h by using a ball mill to prepare raw material powder;
(2) Mixing 6g of triethanolamine, 3g of triisopropanolamine, 40g of silica fume, 12.5g of polyethylene glycol and 60g of water to obtain a grinding aid;
(3) Adding the raw material powder and 5g of grinding aid into a ball mill, uniformly mixing, and grinding until the specific surface area reaches 1024cm 2 And/g, obtaining composite ultrafine powder;
(4) Mixing 55g of cement, 0.7g of polycarboxylic acid high-efficiency water reducer and 1.6 parts of polyacrylamide to obtain a mixture;
(5) Adding 70g of river sand, 110g of cobble and 17g of composite ultrafine powder into the mixture for mixing to obtain a mixture;
(6) And adding 20g of water into the mixture, and mixing to obtain the underwater non-dispersed concrete.
Comparative example 2
(1) Placing 40g of steel slag, 25g of slag, 7g of tertiary fly ash, 3g of lithium slag and 3g of limestone in a drying oven at 100 ℃ to be dried to constant weight, and grinding for 1h by using a ball mill to prepare raw material powder;
(2) Mixing 6g of triethanolamine, 3g of triisopropanolamine, 40g of silica fume, 12.5g of polyethylene glycol and 60g of water to obtain a grinding aid;
(3) Adding the raw material powder and 5g of grinding aid into a ball mill, uniformly mixing, and grinding until the specific surface area reaches 1024cm 2 And/g, obtaining composite ultrafine powder;
(7) Mixing 55g of cement, 0.7g of polycarboxylic acid high-efficiency water reducer and 1.6 parts of polyacrylamide to obtain a mixture;
(5) Adding 70g of river sand, 110g of cobble and 17g of composite ultrafine powder into the mixture for mixing to obtain a mixture;
(6) And adding 20g of water into the mixture, and mixing to obtain the underwater non-dispersed concrete.
Comparative example 3
(1) Same as in example 2; (2) the same as in example 2; (3) the same as in example 2;
(4) Adding raw material powder and 5g of grinding aid into a ball millAfter the mixture is uniformly mixed, grinding until the specific surface area reaches 750cm 2 And/g, obtaining composite ultrafine powder; (5) the same as in example 2; (6) the same as in example 2; (7) the same as in example 2.
Comparative example 4
(1) Placing 40g of steel slag, 25g of slag, 7g of tertiary fly ash, 3g of lithium slag and 3g of limestone in a drying oven at 100 ℃ to be dried to constant weight, and grinding for 1h by using a ball mill to prepare raw material powder;
(2) Mixing 6g of triethanolamine, 3g of triisopropanolamine, 40g of silica fume, 12.5g of polyethylene glycol and 60g of water to obtain a grinding aid;
(3) Adding the raw material powder and 5g of grinding aid into a ball mill, uniformly mixing, and grinding until the specific surface area reaches 743cm 2 And/g, obtaining composite ultrafine powder;
(4) Mixing 55g of cement, 0.7g of polycarboxylic acid high-efficiency water reducer and 1.6 parts of polyacrylamide to obtain a mixture;
(5) Adding 70g of river sand, 110g of cobble and 17g of composite ultrafine powder into the mixture for mixing to obtain a mixture;
(6) And adding 20g of water into the mixture, and mixing to obtain the underwater non-dispersed concrete.
Performance testing
The flowability, the anti-dispersion performance and the mechanical performance of the underwater non-dispersion concrete are all carried out according to the related requirements of DL/T5117-2021, wherein slump and expansion degree show the flowability of the underwater non-dispersion concrete, the test results are shown in table 1, the loss amount of cementing materials and the content of suspended matters show the anti-dispersion performance of the underwater non-dispersion concrete, the test results are shown in table 1, and the compressive strength of 7d and 28 on the water and land show the mechanical performance of the underwater non-dispersion concrete, and the test combination is shown in table 2.
TABLE 1 flowability and anti-dispersion Properties of underwater non-dispersed concrete
Note that: the control group was different from example 2 in that no composite micropowder was added.
Data analysis: as can be seen from examples 1-3, after the composite ultrafine powder prepared by the invention is applied to underwater non-dispersive concrete, the coordination of the flow property and the anti-dispersion property of the underwater non-dispersive concrete can be realized, so that the composite ultrafine powder has excellent flow property and anti-dispersion property, and as can be seen from examples 2 and comparative examples 1-4, the coordination of the larger specific surface area and the modified straw of the composite ultrafine powder promotes excellent flow property and anti-dispersion property.
TABLE 2 mechanical Properties of underwater non-dispersed concrete
Note that: the control group was different from example 2 in that no composite micropowder was added.
Data analysis: it can be seen from examples 1-3 that after the composite ultrafine powder prepared by the invention is applied to underwater non-dispersed concrete, the compressive strength and the amphibious strength ratio of the underwater non-dispersed concrete can be improved, and from examples 2 and comparative examples 1-4, the mechanical properties of the underwater non-dispersed concrete can be reduced by the addition of steel slag, but after the steel slag is prepared into the composite ultrafine powder by adopting the scheme of the invention, the mechanical properties of the non-dispersed concrete are improved, which is positively correlated with the higher specific surface area of the composite ultrafine powder and modified straws.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the invention (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The present invention is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the present invention should be included in the scope of the present invention.
Claims (8)
1. The composite superfine powder is characterized by comprising the following raw materials in parts by weight: 30-50 parts of steel slag, 20-30 parts of slag, 5-9 parts of fly ash, 1-5 parts of lithium slag, 2-4 parts of limestone, 5-10 parts of modified straw and 1-10 parts of grinding aid;
the grinding aid comprises the following raw materials in parts by weight: 5-7 parts of triethanolamine, 2-4 parts of triisopropanolamine, 30-50 parts of silica fume, 10-15 parts of polyethylene glycol and 50-70 parts of water;
the preparation method of the modified straw comprises the following steps: mixing crushed and ground corn stalks with a 50-100-mesh sieve and a 20wt% sodium carbonate solution in a solid-liquid mass ratio of 5-10:10-25, stirring at 95-100 ℃ for reaction for 60-80 hours, filtering after the reaction is finished, and drying the filtered solid at 50-60 ℃ for 5-7 hours to obtain modified stalks;
the specific surface area of the composite superfine powder is not less than 1000cm 2 /g；
The preparation method of the composite ultrafine powder comprises the following steps:
s1: placing steel slag, fly ash, lithium slag, limestone and modified straw in a drying oven at 95-105 ℃ according to the mass ratio of the raw materials, drying to constant weight, and grinding for 1h by using a ball mill to prepare raw material powder;
s2: adding raw material powder and grinding aid into a ball mill, uniformly mixing, and grinding until the specific surface area is not less than 1000cm 2 And/g, obtaining the composite ultrafine powder.
2. The composite ultra-fine powder according to claim 1, wherein the density of the steel slag is 3-5kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The density of the slag is 2-4kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The density of the lithium slag is 2-4kg/m 3 。
3. The composite ultra-fine powder according to claim 1, wherein the fly ash is one or a mixture of several of primary fly ash, secondary fly ash and tertiary fly ash.
4. An underwater non-dispersive concrete comprising the composite ultra-fine powder according to any one of claims 1 to 3, characterized by comprising the following component raw materials in parts by mass: 45-65 parts of cement, 60-80 parts of river sand, 100-120 parts of cobble, 10-25 parts of composite ultrafine powder, 0.5-1 part of water reducer, 1.2-2 parts of flocculant and 18-22 parts of water.
5. The underwater non-dispersive concrete according to claim 4, wherein the water reducing agent is a polycarboxylic acid high efficiency water reducing agent.
6. The underwater non-dispersive concrete of claim 4, wherein the flocculant is polyacrylamide.
7. The underwater non-dispersive concrete according to claim 4, wherein the preparation method of the underwater non-dispersive concrete is as follows:
s3: mixing cement, a water reducing agent and a flocculating agent according to the mass ratio of raw materials to obtain a mixture;
s4: adding river sand, cobble and composite superfine powder into the mixture for mixing to obtain a mixture;
s5: adding water into the mixture, and mixing to obtain the underwater non-dispersed concrete.
8. The use of the underwater non-dispersive concrete according to claim 4 in underwater construction engineering.
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| CN105399349A (en) * | 2014-09-05 | 2016-03-16 | 昂国企业有限公司 | High-activity iron and steel slag powder and preparation method thereof |
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| CN115286278A (en) * | 2022-07-08 | 2022-11-04 | 山东高速集团有限公司创新研究院 | Composite additive for fly ash-based concrete and preparation method and application thereof |
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| CN105399349A (en) * | 2014-09-05 | 2016-03-16 | 昂国企业有限公司 | High-activity iron and steel slag powder and preparation method thereof |
| CN106977160A (en) * | 2017-05-08 | 2017-07-25 | 天津市滨涛混凝土有限公司 | A kind of non-dispersible underwater concrete and preparation method thereof |
| CN112723807A (en) * | 2021-02-08 | 2021-04-30 | 大连理工大学 | Seawater-mixed underwater undispersed concrete and preparation method thereof |
| CN115159918A (en) * | 2022-07-04 | 2022-10-11 | 中国水利水电第七工程局有限公司 | Anti-dispersion self-compacting concrete for underwater repair and preparation method thereof |
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