CN113461389A - Ultrahigh-performance concrete suitable for underwater pouring and preparation process thereof - Google Patents
Ultrahigh-performance concrete suitable for underwater pouring and preparation process thereof Download PDFInfo
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- CN113461389A CN113461389A CN202110853854.4A CN202110853854A CN113461389A CN 113461389 A CN113461389 A CN 113461389A CN 202110853854 A CN202110853854 A CN 202110853854A CN 113461389 A CN113461389 A CN 113461389A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000000843 powder Substances 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000011324 bead Substances 0.000 claims abstract description 27
- 239000004568 cement Substances 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 27
- 239000010881 fly ash Substances 0.000 claims abstract description 27
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 27
- 239000011707 mineral Substances 0.000 claims abstract description 27
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 239000006004 Quartz sand Substances 0.000 claims abstract description 22
- 239000010453 quartz Substances 0.000 claims abstract description 21
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 20
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 18
- 239000008394 flocculating agent Substances 0.000 claims abstract description 16
- 239000004567 concrete Substances 0.000 claims abstract description 14
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 12
- 239000008030 superplasticizer Substances 0.000 claims abstract description 12
- 229920002472 Starch Polymers 0.000 claims abstract description 7
- 239000003921 oil Substances 0.000 claims abstract description 7
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims abstract description 7
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 7
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 7
- 229940100445 wheat starch Drugs 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 35
- 235000012239 silicon dioxide Nutrition 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 16
- 239000004576 sand Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 239000003638 chemical reducing agent Substances 0.000 claims description 11
- 235000013339 cereals Nutrition 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 239000002956 ash Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 239000006185 dispersion Substances 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 239000013530 defoamer Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 abstract description 2
- NPNUFJAVOOONJE-ZIAGYGMSSA-N β-(E)-Caryophyllene Chemical compound C1CC(C)=CCCC(=C)[C@H]2CC(C)(C)[C@@H]21 NPNUFJAVOOONJE-ZIAGYGMSSA-N 0.000 description 6
- NVEQFIOZRFFVFW-UHFFFAOYSA-N 9-epi-beta-caryophyllene oxide Natural products C=C1CCC2OC2(C)CCC2C(C)(C)CC21 NVEQFIOZRFFVFW-UHFFFAOYSA-N 0.000 description 3
- FAMPSKZZVDUYOS-UHFFFAOYSA-N alpha-Caryophyllene Natural products CC1=CCC(C)(C)C=CCC(C)=CCC1 FAMPSKZZVDUYOS-UHFFFAOYSA-N 0.000 description 3
- NPNUFJAVOOONJE-UHFFFAOYSA-N beta-cariophyllene Natural products C1CC(C)=CCCC(=C)C2CC(C)(C)C21 NPNUFJAVOOONJE-UHFFFAOYSA-N 0.000 description 3
- 229940117948 caryophyllene Drugs 0.000 description 3
- NPNUFJAVOOONJE-UONOGXRCSA-N caryophyllene Natural products C1CC(C)=CCCC(=C)[C@@H]2CC(C)(C)[C@@H]21 NPNUFJAVOOONJE-UONOGXRCSA-N 0.000 description 3
- 239000011362 coarse particle Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/44—Thickening, gelling or viscosity increasing agents
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/50—Defoamers, air detrainers
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an ultra-high performance concrete suitable for underwater pouring and a preparation process thereof, wherein the concrete consists of cement, fly ash, mineral powder, silica fume, fine precipitated beads, quartz sand, quartz powder, a high-performance polycarboxylate superplasticizer, a retarder, a defoaming agent, a tackifier, a flocculating agent, water and steel fibers, and comprises the following components in parts by weight: 60-75 parts of cement; 10-15 parts of fly ash; 10-20 parts of mineral powder; 10-20 parts of silica fume; 5-10 parts of fine sinking beads; 90-110 parts of quartz sand. The invention adopts wheat starch as the tackifier, overcomes the defects of easy pollution and high manufacturing cost of other tackifiers, adopts ferric trichloride as the flocculant, overcomes the defect of easy dispersion of slurry cast by the ultra-high performance concrete in water, adopts sodium hexametaphosphate as the retarder, ensures the workability of the concrete, adopts the hop oil as the defoamer, saves the construction cost, meets the environmental protection requirement, and ensures that the prepared ultra-high performance concrete has the advantages of high strength, good durability and difficult dispersion.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to ultra-high performance concrete suitable for underwater pouring and a preparation process thereof.
Background
Concrete in underwater engineering is one of the most main building materials with the largest using amount, and the performance of the underwater concrete directly influences the quality and progress of the underwater engineering, so that the quality of the underwater concrete is very important for the underwater building.
In order to solve the problems, the traditional methods are mainly improved from construction methods, such as a conduit method, a bottom-opened container method and the like, the direct contact between a concrete mixture and water is reduced, and the influence of water on the concrete mixture is avoided.
Disclosure of Invention
The invention aims to provide an ultra-high performance concrete suitable for underwater pouring and a preparation process thereof, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the concrete consists of cement, fly ash, mineral powder, silica fume, fine settled beads, quartz sand, quartz powder, a high-performance polycarboxylate superplasticizer, a retarder, a defoaming agent, a tackifier, a flocculating agent, water and steel fibers, wherein the components in parts by weight are as follows: 60-75 parts of cement; 10-15 parts of fly ash; 10-20 parts of mineral powder; 10-20 parts of silica fume; 5-10 parts of fine sinking beads; 90-110 parts of quartz sand; 0-40 parts of quartz powder; 1-1.5 parts of a high-performance polycarboxylic acid water reducing agent; 0.3-0.6 part of retarder; 0.5-1 part of defoaming agent; 1-2 parts of a tackifier; 0.4-0.5 part of flocculant; 16-20 parts of water; 10-15 parts of steel fiber.
Preferably, the cement is 525-grade ordinary portland cement, the fly ash is F-class II-grade ash with the particle size of 0-300 mu m, the type of the mineral powder is S95-grade, and the specific surface area is 420m2Per kg, the average particle size of the silica fume is 0.15-0.25 mu m, the content of the silicon dioxide is more than 90 percent, the shape of the fine sinking bead is completely spherical, and the density of the sphere is 2.5g/cm3The average particle size is 2.0 mu m, and the sum of the cement, the fly ash, the fine sinking beads, the mineral powder and the silica fume is 100 parts.
Preferably, the tackifier is wheat starch, the fineness of the tackifier is more than 99%, the flocculating agent is ferric trichloride powder, the content of the ferric trichloride is more than 95%, the quartz sand comprises three grain grades of coarse grain size sand (1.18-0.6 mm), medium grain size sand (0.6-0.3 mm) and fine grain size sand (0.3-0.15 mm), and the weight is 3: 5: blending at a ratio of 2, wherein the quartz powder is 325 meshes and the average particle size is 55 mu m.
Preferably, the high-performance polycarboxylate water reducer is white powdery solid with the solid content of 24 percent and the water reducing rate of 36 percent, the defoaming agent is hop oil, the retarder is sodium hexametaphosphate which is white powdery in appearance and has the density of 2.5g/cm3The steel fiber is plated with copperMicrofilaments with a length of 13mm and a diameter of 0.21 mm.
A preparation process suitable for underwater pouring of ultrahigh-performance concrete comprises the following steps:
(1) selecting raw materials meeting the requirements and accurately weighing the corresponding raw materials according to the requirements of the mixing proportion and the dosage;
(2) adding powder materials (cement, fly ash, fine precipitated beads, mineral powder, silica fume, a high-performance polycarboxylate water reducer, a retarder, a tackifier and a flocculating agent) and quartz sand into a high-speed stirrer;
(3) adding quartz powder, and stirring for 2min at a stirring speed of 200 r/min;
(4) mixing the defoaming agent and water, adding the mixture into the mixture, and stirring for 1min at the stirring speed of 300 r/min;
(5) adding steel fibers, continuously stirring for 2min at the stirring speed of 300r/min, and taking out after stirring to obtain the underwater poured ultrahigh-performance concrete.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts wheat starch as the tackifier, overcomes the defects of easy pollution and high manufacturing cost of other tackifiers, adopts ferric trichloride as the flocculant, overcomes the defect of easy dispersion of slurry cast by the ultra-high performance concrete in water, adopts sodium hexametaphosphate as the retarder, ensures the workability of the concrete, adopts the hop oil as the defoamer, saves the construction cost, meets the environmental protection requirement, and ensures that the prepared ultra-high performance concrete has the advantages of high strength, good durability and difficult dispersion.
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, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
is suitable forThe method comprises the following steps of pouring ultrahigh-performance concrete under water, wherein the concrete consists of cement, fly ash, mineral powder, silica fume, fine settled beads, quartz sand, quartz powder, a high-performance polycarboxylate superplasticizer, a retarder, a defoaming agent, a tackifier, a flocculating agent, water and steel fibers, and comprises the following components in parts by weight: 60 parts of cement; 12 parts of fly ash; 10 parts of mineral powder; 10 parts of silica fume; 8 parts of fine sinking beads; 110 parts of quartz sand; 30 parts of quartz powder; 1 part of a high-performance polycarboxylic acid water reducing agent; 0.4 part of retarder; 0.5 part of defoaming agent; 1.5 parts of a tackifier; 0.5 part of flocculant; 18 parts of water; 12 parts of steel fiber, wherein the cement is 525-grade ordinary portland cement, the fly ash is F-class II-grade ash, the particle size is 0-300 mu m, the type of the mineral powder is S95-grade, and the specific surface area is 420m2Per kg, the average particle size of the silica fume is 0.15-0.25 mu m, the content of the silicon dioxide is more than 90 percent, the shape of the fine sinking bead is completely spherical, and the density of the sphere is 2.5g/cm3The average particle size is 2.0 mu m, the sum of cement, fly ash, fine settled beads, mineral powder and silica fume is 100 parts, the tackifier is wheat starch, the fineness is more than 99%, the flocculating agent is ferric trichloride powder, the content of ferric trichloride is more than 95%, the quartz sand comprises three particle sizes of coarse particle size sand (1.18-0.6 mm), medium particle size sand (0.6-0.3 mm) and fine particle size sand (0.3-0.15 mm), and the weight is 3: 5: 2 proportion, wherein the quartz powder is 325 mesh grade, the average grain size is 55 mu m, the high-performance polycarboxylate superplasticizer is white powdery solid, the solid content is 24 percent, the water reducing rate is 36 percent, the defoaming agent is hop oil, the contained caryophyllene and other components can effectively eliminate bubbles generated in the mixing process, the retarder is sodium hexametaphosphate which is white powdery in appearance and has the density of 2.5g/cm3The steel fiber is copper-plated micro-wires, the length of the steel fiber is 13mm, and the diameter of the steel fiber is 0.21 mm.
The initial expansion degree is 670mm, the 28d compressive strength in air is 138MPa, the 28d tensile strength in air is 9.6MPa, the 28d compressive strength in water is 111.8MPa, the 28d tensile strength in water is 7.9MPa, and the pouring effect in water is good according to the method provided by the specification TCES 10107-2020.
A preparation process suitable for underwater pouring of ultrahigh-performance concrete comprises the following steps:
(1) selecting raw materials meeting the requirements and accurately weighing the corresponding raw materials according to the requirements of the mixing proportion and the dosage;
(2) adding powder materials (cement, fly ash, fine precipitated beads, mineral powder, silica fume, a high-performance polycarboxylate water reducer, a retarder, a tackifier and a flocculating agent) and quartz sand into a high-speed stirrer;
(3) adding quartz powder, and stirring for 2min at a stirring speed of 200 r/min;
(4) mixing the defoaming agent and water, adding the mixture into the mixture, and stirring for 1min at the stirring speed of 300 r/min;
(5) adding steel fibers, continuously stirring for 2min at the stirring speed of 300r/min, and taking out after stirring to obtain the underwater poured ultrahigh-performance concrete.
Example two:
the concrete consists of cement, fly ash, mineral powder, silica fume, fine settled beads, quartz sand, quartz powder, a high-performance polycarboxylate superplasticizer, a retarder, a defoaming agent, a tackifier, a flocculating agent, water and steel fibers, wherein the components in parts by weight are as follows: 61 parts of cement; 12 parts of fly ash; 10 parts of mineral powder; 12 parts of silica fume; 5 parts of fine sinking beads; 108 parts of quartz sand; 35 parts of quartz powder; 1 part of a high-performance polycarboxylic acid water reducing agent; 0.5 part of retarder; 0.6 part of defoaming agent; 1.6 parts of a tackifier; 0.5 part of flocculant; 18 parts of water; 13 parts of steel fiber, wherein the cement is 525-grade ordinary portland cement, the fly ash is F-class II-grade ash, the particle size is 0-300 mu m, the type of the mineral powder is S95-grade, and the specific surface area is 420m2Per kg, the average particle size of the silica fume is 0.15-0.25 mu m, the content of the silicon dioxide is more than 90 percent, the shape of the fine sinking bead is completely spherical, and the density of the sphere is 2.5g/cm3The average particle size is 2.0 mu m, the sum of cement, fly ash, fine settled beads, mineral powder and silica fume is 100 parts, the tackifier is wheat starch, the fineness is more than 99%, the flocculating agent is ferric trichloride powder, the content of ferric trichloride is more than 95%, the quartz sand comprises three particle sizes of coarse particle size sand (1.18-0.6 mm), medium particle size sand (0.6-0.3 mm) and fine particle size sand (0.3-0.15 mm), and the weight is 3: 5: blending at a ratio of 2, wherein the quartz powder is 325 meshes, the average particle size is 55 mu m, and the high-performance polycarboxylate superplasticizer is white powderSolid with a solid content of 24% and a water reducing rate of 36%, the defoamer is hop oil, the contained caryophyllene and other components can effectively eliminate bubbles generated in the mixing process, the retarder is sodium hexametaphosphate which is white powder in appearance and has a density of 2.5g/cm3The steel fiber is copper-plated micro-wires, the length of the steel fiber is 13mm, and the diameter of the steel fiber is 0.21 mm.
The initial expansion degree is 690mm, the 28d compressive strength in air is 124MPa, the 28d tensile strength in air is 8.8MPa, the 28d compressive strength in water is 94.2MPa, the 28d tensile strength in water is 7.0MPa, and the pouring effect in water is good according to the method provided by the TCES 10107-2020 standard.
A preparation process suitable for underwater pouring of ultrahigh-performance concrete comprises the following steps:
(1) selecting raw materials meeting the requirements and accurately weighing the corresponding raw materials according to the requirements of the mixing proportion and the dosage;
(2) adding powder materials (cement, fly ash, fine precipitated beads, mineral powder, silica fume, a high-performance polycarboxylate water reducer, a retarder, a tackifier and a flocculating agent) and quartz sand into a high-speed stirrer;
(3) adding quartz powder, and stirring for 2min at a stirring speed of 200 r/min;
(4) mixing the defoaming agent and water, adding the mixture into the mixture, and stirring for 1min at the stirring speed of 300 r/min;
(5) adding steel fibers, continuously stirring for 2min at the stirring speed of 300r/min, and taking out after stirring to obtain the underwater poured ultrahigh-performance concrete.
Example three:
the concrete consists of cement, fly ash, mineral powder, silica fume, fine settled beads, quartz sand, quartz powder, a high-performance polycarboxylate superplasticizer, a retarder, a defoaming agent, a tackifier, a flocculating agent, water and steel fibers, wherein the components in parts by weight are as follows: 65 parts of cement; 10 parts of fly ash; 7 parts of mineral powder; 15 parts of silica fume; 3 parts of fine sinking beads; 115 parts of quartz sand; 40 parts of quartz powder; 1 part of a high-performance polycarboxylic acid water reducing agent; 0.5 part of retarder; 0.5 part of defoaming agent; 2.0 parts of a tackifier; wadding0.6 part of coagulant; 18 parts of water; 14 parts of steel fiber, wherein the cement is 525-grade ordinary portland cement, the fly ash is F-class II-grade ash, the particle size is 0-300 mu m, the type of the mineral powder is S95-grade, and the specific surface area is 420m2Per kg, the average particle size of the silica fume is 0.15-0.25 mu m, the content of the silicon dioxide is more than 90 percent, the shape of the fine sinking bead is completely spherical, and the density of the sphere is 2.5g/cm3The average particle size is 2.0 mu m, the sum of cement, fly ash, fine settled beads, mineral powder and silica fume is 100 parts, the tackifier is wheat starch, the fineness is more than 99%, the flocculating agent is ferric trichloride powder, the content of ferric trichloride is more than 95%, the quartz sand comprises three particle sizes of coarse particle size sand (1.18-0.6 mm), medium particle size sand (0.6-0.3 mm) and fine particle size sand (0.3-0.15 mm), and the weight is 3: 5: 2 proportion, wherein the quartz powder is 325 mesh grade, the average grain size is 55 mu m, the high-performance polycarboxylate superplasticizer is white powdery solid, the solid content is 24 percent, the water reducing rate is 36 percent, the defoaming agent is hop oil, the contained caryophyllene and other components can effectively eliminate bubbles generated in the mixing process, the retarder is sodium hexametaphosphate which is white powdery in appearance and has the density of 2.5g/cm3The steel fiber is copper-plated micro-wires, the length of the steel fiber is 13mm, and the diameter of the steel fiber is 0.21 mm.
The initial expansion degree is 685mm, the 28d compressive strength in air is 140MPa, the 28d tensile strength in air is 12.4MPa, the 28d compressive strength in water is 112.5MPa, the 28d tensile strength in water is 9.3MPa, and the pouring effect in water is good.
A preparation process suitable for underwater pouring of ultrahigh-performance concrete comprises the following steps:
(1) selecting raw materials meeting the requirements and accurately weighing the corresponding raw materials according to the requirements of the mixing proportion and the dosage;
(2) adding powder materials (cement, fly ash, fine precipitated beads, mineral powder, silica fume, a high-performance polycarboxylate water reducer, a retarder, a tackifier and a flocculating agent) and quartz sand into a high-speed stirrer;
(3) adding quartz powder, and stirring for 2min at a stirring speed of 200 r/min;
(4) mixing the defoaming agent and water, adding the mixture into the mixture, and stirring for 1min at the stirring speed of 300 r/min;
(5) adding steel fibers, continuously stirring for 2min at the stirring speed of 300r/min, and taking out after stirring to obtain the underwater poured ultrahigh-performance concrete.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a be applicable to pour ultra high performance concrete under water which characterized in that: the concrete consists of cement, fly ash, mineral powder, silica fume, fine settled beads, quartz sand, quartz powder, a high-performance polycarboxylate superplasticizer, a retarder, a defoaming agent, a tackifier, a flocculating agent, water and steel fibers, and comprises the following components in parts by weight: 60-75 parts of cement; 10-15 parts of fly ash; 10-20 parts of mineral powder; 10-20 parts of silica fume; 5-10 parts of fine sinking beads; 90-110 parts of quartz sand; 0-40 parts of quartz powder; 1-1.5 parts of a high-performance polycarboxylic acid water reducing agent; 0.3-0.6 part of retarder; 0.5-1 part of defoaming agent; 1-2 parts of a tackifier; 0.4-0.5 part of flocculant; 16-20 parts of water; 10-15 parts of steel fiber.
2. The method for underwater placement of ultra-high performance concrete of claim 1, wherein: the cement is 525-grade ordinary portland cement, the fly ash is F-class II-grade ash, the particle size is 0-300 mu m, the mineral powder type is S95 grade, and the specific surface area is 420m2Per kg, the average particle size of the silica fume is 0.15-0.25 mu m, the content of the silicon dioxide is more than 90 percent, the shape of the fine sinking bead is completely spherical, and the density of the sphere is 2.5g/cm3The average particle size is 2.0 mu m, and the sum of the cement, the fly ash, the fine sinking beads, the mineral powder and the silica fume is 100 parts.
3. The method for underwater placement of ultra-high performance concrete of claim 1, wherein: the tackifier is wheat starch, the fineness of the tackifier is more than 99%, the flocculating agent is ferric trichloride powder, the content of the ferric trichloride is more than 95%, the quartz sand comprises three grain fractions of coarse grain size sand (1.18-0.6 mm), medium grain size sand (0.6-0.3 mm) and fine grain size sand (0.3-0.15 mm), and the weight is 3: 5: blending at a ratio of 2, wherein the quartz powder is 325 meshes and the average particle size is 55 mu m.
4. The method for underwater placement of ultra-high performance concrete of claim 1, wherein: the high-performance polycarboxylate superplasticizer is a white powdery solid, the solid content is 24%, the water reducing rate is 36%, the defoaming agent is hop oil, the retarder is sodium hexametaphosphate, the appearance of the high-performance polycarboxylate superplasticizer is white powdery, and the density of the high-performance polycarboxylate superplasticizer is 2.5g/cm3The steel fiber is copper-plated micro-wire with the length of 13mm and the diameter of 0.21 mm.
5. A preparation process suitable for underwater pouring of ultrahigh-performance concrete is characterized by comprising the following steps of: the preparation process comprises the following steps:
(1) selecting raw materials meeting the requirements and accurately weighing the corresponding raw materials according to the requirements of the mixing proportion and the dosage;
(2) adding powder materials (cement, fly ash, fine precipitated beads, mineral powder, silica fume, a high-performance polycarboxylate water reducer, a retarder, a tackifier and a flocculating agent) and quartz sand into a high-speed stirrer;
(3) adding quartz powder, and stirring for 2min at a stirring speed of 200 r/min;
(4) mixing the defoaming agent and water, adding the mixture into the mixture, and stirring for 1min at the stirring speed of 300 r/min;
(5) adding steel fibers, continuously stirring for 2min at the stirring speed of 300r/min, and taking out after stirring to obtain the underwater poured ultrahigh-performance concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110853854.4A CN113461389A (en) | 2021-07-28 | 2021-07-28 | Ultrahigh-performance concrete suitable for underwater pouring and preparation process thereof |
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Cited By (5)
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| CN113501695A (en) * | 2021-07-29 | 2021-10-15 | 武汉磊固实业有限公司 | Non-shrinkage ultrahigh-strength regenerated grouting material and preparation method thereof |
| CN114436582A (en) * | 2021-12-21 | 2022-05-06 | 中交武汉港湾工程设计研究院有限公司 | Underwater non-dispersible ultrahigh-performance concrete and preparation method thereof |
| CN115304311A (en) * | 2022-07-14 | 2022-11-08 | 福建三凯建筑材料有限公司 | Ultrahigh-performance concrete and preparation method thereof |
| CN115536297A (en) * | 2022-10-18 | 2022-12-30 | 贵阳中建西部建设有限公司 | Additive for ultralong slow-setting type underwater undispersed concrete and preparation method thereof |
| CN115677260A (en) * | 2022-10-18 | 2023-02-03 | 中建西部建设(广东)有限公司 | Additive for slow-setting type underwater undispersed concrete and preparation method thereof |
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| CN113501695A (en) * | 2021-07-29 | 2021-10-15 | 武汉磊固实业有限公司 | Non-shrinkage ultrahigh-strength regenerated grouting material and preparation method thereof |
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| CN115304311A (en) * | 2022-07-14 | 2022-11-08 | 福建三凯建筑材料有限公司 | Ultrahigh-performance concrete and preparation method thereof |
| CN115536297A (en) * | 2022-10-18 | 2022-12-30 | 贵阳中建西部建设有限公司 | Additive for ultralong slow-setting type underwater undispersed concrete and preparation method thereof |
| CN115677260A (en) * | 2022-10-18 | 2023-02-03 | 中建西部建设(广东)有限公司 | Additive for slow-setting type underwater undispersed concrete and preparation method thereof |
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Application publication date: 20211001 |