CN112456920A - High flow state ultra-high performance concrete - Google Patents
High flow state ultra-high performance concrete Download PDFInfo
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- CN112456920A CN112456920A CN202011509510.3A CN202011509510A CN112456920A CN 112456920 A CN112456920 A CN 112456920A CN 202011509510 A CN202011509510 A CN 202011509510A CN 112456920 A CN112456920 A CN 112456920A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The invention discloses high-flow-state ultrahigh-performance concrete which comprises the following raw materials in parts by weight: 680 parts of cement 620-containing material, 156 parts of silica fume 144-containing material, 210 parts of fly ash fine settled beads 190-containing material, 20-40 parts of mineral dispersant, 1075 parts of quartz sand 1030-containing material, 160 parts of steel fiber 120-containing material, 8.5-10.5 parts of water reducer, 1.4-1.6 parts of defoaming agent and 195 parts of water 165-containing material; the silica fume is unencrypted silica fume, and the bulk density is 340-3，SiO2The content is more than or equal to 98 percent, and the specific surface area is 20000-25000m2Per kg, the average grain diameter is less than or equal to 0.1 mu m, the 28d activity index is more than or equal to 110 percent, and the water demand ratio is less than or equal to 106 percent; the shape of the fine precipitated beads of the fly ash is spherical, and the bulk density is 750kg/m3The particle grading is continuous particle distribution, the fineness is less than or equal to 5 percent, the water demand ratio is less than or equal to 90 percent, and the activity of 28 is more than or equal to 80 percent; the mineral dispersant is hydrophobic modified SiO2Powder, hydrophobically modified zeolite powder or a mixture of the two. The ultra-high performance concrete obtained by the invention has good dispersibility and fluidity, when the water-cement ratio is lower than 0.18, the slump expansion degree is still larger than 840mm, and simultaneously, the concrete resists compressionThe strength is not reduced and still higher than 180 MPa.
Description
Technical Field
The invention relates to the technical field of ultra-high performance concrete, in particular to high-flow ultra-high performance concrete.
Background
Ultra High Performance Concrete (UHPC) is an ultra high performance fiber reinforced cement-based composite material with high compression strength, high tensile strength, high modulus, high ductility and high durability, and is prepared from cement, mineral admixture, quartz sand, quartz powder, steel fiber, water reducing agent and water according to the maximum compactness theory, so that the defects in the material are minimized. The different aspects of UHPC from ordinary concrete or high-performance concrete include: without using coarse aggregate, silica fume and fiber (steel fiber or composite organic fiber) are used, the cement consumption is large, and the water-cement ratio is low. The water-gel ratio is generally controlled to be below 0.20, the unit water consumption is extremely low, the fineness of powder is high, the specific surface area is large, and meanwhile a large amount of microfilament steel fibers are required to be added into UHPC, so that the UHPC has generally poor fluidity, and the slump expansion is smaller than 640 mm.
In order to improve the fluidity of the ultra-high performance concrete, chinese patent application publication No. CN110981358A discloses a high-fluidity high-viscosity shrinkage-compensating UHPC, which has a compact packing state and a reduced water consumption by matching particle sizes to improve the fluidity, but the expansion degree of a concrete slump expansion cylinder is less than 700 mm. The Chinese patent application with publication number CN 107892527A discloses an ultra-high performance concrete prepared by using wet granite rock powder and a preparation method thereof, and the ultra-high performance concrete with slump expansion lower than 600mm is obtained by adopting fly ash micro-beads with water demand less than 85% as an admixture.
Disclosure of Invention
The invention aims to provide high-flow-state ultrahigh-performance concrete, which improves the fluidity of the concrete while ensuring the compressive strength of the concrete.
The technical scheme adopted by the invention for solving the technical problems is as follows: the high flow state ultra-high performance concrete comprises the following raw materials in parts by weight: 680 parts of cement 620-containing material, 156 parts of silica fume 144-containing material, 210 parts of fly ash fine settled beads 190-containing material, 20-40 parts of mineral dispersant, 1075 parts of quartz sand 1030-containing material, 160 parts of steel fiber 120-containing material, 8.5-10.5 parts of water reducer, 1.4-1.6 parts of defoaming agent and 195 parts of water 165-containing material;
the silica fume is not encrypted silica fume,the bulk density is 340-3，SiO2The content is more than or equal to 98 percent, and the specific surface area is 20000-25000m2Per kg, the average grain diameter is less than or equal to 0.1 mu m, the 28d activity index is more than or equal to 110 percent, and the water demand ratio is less than or equal to 106 percent;
the shape of the fine precipitated beads of the fly ash is spherical, and the bulk density is 750kg/m3The particle grading is continuous particle distribution, the fineness is less than or equal to 5 percent, the water demand ratio is less than or equal to 90 percent, and the activity of 28 is more than or equal to 80 percent; the fine precipitated coal ash beads are specially classified coal ash, have the characteristics of thick wall, large volume weight, high strength, small particle size, good wear resistance, central bead body shape and good circularity, and have the particle size of 0.25-150 mu m.
The mineral dispersant is hydrophobic modified SiO2Powder, hydrophobically modified zeolite powder or a mixture of the two.
SiO2The surfaces of the powder and the zeolite powder are subjected to hydrophobic treatment by a vapor deposition process, the contact angle is higher than 150 degrees, the rolling angle is less than 10 degrees, and the median particle size of the particles is 5-10 mu m. The used mineral dispersant has the super-hydrophobic characteristic, when the mineral dispersant is fully mixed with a gelled material and then is stirred with water, the surface of the super-hydrophobic mineral dispersant cannot be wetted by the water, the water is discharged from the periphery of the particles of the mineral dispersant, the mineral dispersant is filled among the particles to flow as the automatic water, the flowing property of UHPC slurry is improved, meanwhile, the particle size of the super-hydrophobic powder is smaller than that of cement particles and fine precipitated beads of fly ash, the flocculated slurry can be opened more conveniently, the slurry is more fully dispersed, and the flowing property of the slurry is improved.
Furthermore, the quartz sand is prepared in a multistage mode, the quartz sand grading is respectively 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes, and the ratio of the quartz sand grading to the quartz sand grading is respectively 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes is 4:3:2: 1.
The grading of the quartz sand is designed, the particle size of the quartz sand is below 0.55mm, the sedimentation caused by overlarge aggregate due to low slurry viscosity is avoided, the fine aggregate is compactly accumulated by being divided into three or four of 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes, and the quartz sand with small particle size is embedded into the particle size of the larger particle, so that a compact accumulation structure is formed, the system strength is improved, the prepared slurry is good in flowing state, and the strength is excellent.
Further, the steel fiber is a copper-plated micro-wire straight steel fiber, the length of the straight steel fiber is 12-14mm, the diameter is 0.18-0.23mm, and the tensile strength is 2850 and 3050 MPa. The straight steel fiber with the volume ratio of 1.5-2% is doped into the ultra-high performance concrete, and the straight steel fiber can be well dispersed in the ultra-high performance concrete slurry with the volume ratio of 1.5-2%, so that the influence on the flow property of the ultra-high performance concrete is low, and meanwhile, the tensile strength and the bending strength of the hardened slurry can be greatly improved, and the crack resistance is improved.
Further, the water reducing agent is a high-dispersion polycarboxylic acid water reducing agent and is white solid powder, and the water reducing rate is more than 35%.
Further, the defoaming agent is a polyether defoaming agent and is white solid powder.
Further, the cement is Portland cement or ordinary Portland cement with the strength grade of 52.5, and the specific surface area of the cement is 400-450m2Per kg, the average particle diameter of the particles is 15-17 μm.
The preparation method of the high-flow-state ultrahigh-performance concrete comprises the following steps of:
(1) adding cement, silica fume, fine precipitated beads of fly ash, quartz sand, a mineral dispersant, a water reducing agent and a defoaming agent into a stirrer according to the proportion and uniformly stirring;
(2) adding steel fiber, stirring to disperse the steel fiber in the slurry, adding water and stirring.
The invention has the beneficial effects that: the ultra-high performance concrete obtained by the invention has good dispersibility and fluidity, when the water-cement ratio is lower than 0.18, the slump expansion degree is still larger than 840mm, and meanwhile, the compressive strength is not reduced and is still higher than 180 MPa.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1:
weighing the raw materials according to the following single mixing amount proportion:
664.3kg of cement, 153.3kg of silica fume, 204.4kg of fly ash fine settled beads, 20kg of mineral dispersant, 1060kg of multistage matched quartz sand, 160kg of copper-plated micro-wire straight steel fibers, 8.7kg of high-performance polycarboxylate superplasticizer solid powder, 1.53kg of defoaming agent solid powder and 184kg of water;
the cement is Portland cement or ordinary Portland cement with the strength grade of 52.5, and the specific surface area of the cement is 400-450m2Per kg, the average particle diameter of the particles is 15-17 mu m; the silica fume is unencrypted silica fume, and the bulk density is 340-3，SiO2The content is more than or equal to 98 percent, and the specific surface area is 20000-25000m2Per kg, the average grain diameter is less than or equal to 0.1 mu m, the 28d activity index is more than or equal to 110 percent, and the water demand ratio is less than or equal to 106 percent; the particle shape of the fine precipitated beads of the fly ash is standard spherical, and the bulk density is 700-750kg/m3The particle grading is continuous particle distribution, the fineness is less than or equal to 5 percent, the water demand ratio is less than or equal to 90 percent, and the activity of 28 is more than or equal to 80 percent; the mineral dispersant is hydrophobic modified SiO2Pulverizing; the grading of the multi-grade quartz sand is 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes respectively, and the proportion of the grading is respectively 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes is 4:3:2: 1; the steel fiber is a copper-plated micro-wire straight steel fiber, the length of the straight steel fiber is 12-14mm, the diameter is 0.18-0.23mm, and the tensile strength is 2850 and 3050 MPa; the water reducing rate of the high-performance polycarboxylate superplasticizer solid powder is 40%.
Adding cement, silica fume, fine precipitated beads of fly ash, quartz sand, a mineral dispersant, a water reducing agent and a defoaming agent into a stirrer according to a ratio, and stirring for 2min to enable the materials to be in a uniform state; adding steel fiber, stirring for 2min to disperse the steel fiber in the slurry, adding water, and stirring for 5min to obtain slurry with homogeneous and fluid state.
The prepared UHPC slurry is subjected to slump expansion testing, and the slump expansion testing method refers to standard GB/T50080-2016 of a common concrete mixture performance testing method; after the work performance of the UHPC is tested, the UHPC is put into a triple die with the thickness of 40mm x 160mm, the die is removed after the UHPC is placed in a standard curing room with the temperature of 20 ℃ and the relative humidity of more than 95 percent for curing for 24 hours, the UHPC test block is continuously placed in a standard curing room for curing, and after the curing reaches the design age, the mechanical property is tested, and the test method of the mechanical property refers to the method for testing the strength of cement mortar 17671-1999 (ISO method).
Example 2:
weighing the raw materials according to the following single mixing amount proportion:
664.3kg of cement, 145kg of silica fume, 207kg of fly ash fine settled beads, 30kg of mineral dispersing agent, 1040kg of multistage matched quartz sand, 120kg of copper-plated microwire straight steel fiber, 9.6kg of high-performance polycarboxylic acid water reducing agent solid powder, 1.53kg of defoaming agent solid powder and 186kg of water;
the cement is Portland cement or ordinary Portland cement with the strength grade of 52.5, and the specific surface area of the cement is 400-450m2Per kg, the average particle diameter of the particles is 15-17 mu m; the silica fume is unencrypted silica fume, and the bulk density is 340-3，SiO2The content is more than or equal to 98 percent, and the specific surface area is 20000-25000m2Per kg, the average grain diameter is less than or equal to 0.1 mu m, the 28d activity index is more than or equal to 110 percent, and the water demand ratio is less than or equal to 106 percent; the particle shape of the fine precipitated beads of the fly ash is standard spherical, and the bulk density is 700-750kg/m3The particle grading is continuous particle distribution, the fineness is less than or equal to 5 percent, the water demand ratio is less than or equal to 90 percent, and the activity of 28 is more than or equal to 80 percent; the mineral dispersant is hydrophobic modified SiO2Pulverizing; the grading of the multi-grade quartz sand is 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes respectively, and the proportion of the grading is respectively 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes is 4:3:2: 1; the steel fiber is a copper-plated micro-wire straight steel fiber, the length of the straight steel fiber is 12-14mm, the diameter is 0.18-0.23mm, and the tensile strength is 2850 and 3050 MPa; the water reducing rate of the high-performance polycarboxylate superplasticizer solid powder is 40%.
Adding cement, silica fume, fine precipitated beads of fly ash, quartz sand, a mineral dispersant, a water reducing agent and a defoaming agent into a stirrer according to a ratio, and stirring for 2min to enable the materials to be in a uniform state; adding steel fiber, stirring for 2min to disperse the steel fiber in the slurry, adding water, and stirring for 5min to obtain slurry with homogeneous and fluid state.
The prepared UHPC slurry is subjected to slump expansion testing, and the slump expansion testing method refers to standard GB/T50080-2016 of a common concrete mixture performance testing method; after the work performance of the UHPC is tested, the UHPC is put into a triple die with the thickness of 40mm x 160mm, the die is removed after the UHPC is placed in a standard curing room with the temperature of 20 ℃ and the relative humidity of more than 95 percent for curing for 24 hours, the UHPC test block is continuously placed in a standard curing room for curing, and after the curing reaches the design age, the mechanical property is tested, and the test method of the mechanical property refers to the method for testing the strength of cement mortar 17671-1999 (ISO method).
Example 3:
weighing the raw materials according to the following single mixing amount proportion:
674kg of cement, 156kg of silica fume, 193kg of fly ash fine settled beads, 30kg of mineral dispersant, 1060kg of multistage matched quartz sand, 160kg of copper-plated micro-wire straight steel fiber, 10.5kg of high-performance polycarboxylate superplasticizer solid powder, 1.53kg of defoamer solid powder and 179kg of water;
the cement is Portland cement or ordinary Portland cement with the strength grade of 52.5, and the specific surface area of the cement is 400-450m2Per kg, the average particle diameter of the particles is 15-17 mu m; the silica fume is unencrypted silica fume, and the bulk density is 340-3，SiO2The content is more than or equal to 98 percent, and the specific surface area is 20000-25000m2Per kg, the average grain diameter is less than or equal to 0.1 mu m, the 28d activity index is more than or equal to 110 percent, and the water demand ratio is less than or equal to 106 percent; the particle shape of the fine precipitated beads of the fly ash is standard spherical, and the bulk density is 700-750kg/m3The particle grading is continuous particle distribution, the fineness is less than or equal to 5 percent, the water demand ratio is less than or equal to 90 percent, and the activity of 28 is more than or equal to 80 percent; the mineral dispersant is hydrophobic modified SiO2Pulverizing; the grading of the multi-grade quartz sand is 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes respectively, and the proportion of the grading is respectively 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes is 4:3:2: 1; the steel fiber is a copper-plated micro-wire straight steel fiber, the length of the straight steel fiber is 12-14mm, the diameter is 0.18-0.23mm, and the tensile strength is 2850 and 3050 MPa; the water reducing rate of the high-performance polycarboxylate superplasticizer solid powder is 40%.
Adding cement, silica fume, fine precipitated beads of fly ash, quartz sand, a mineral dispersant, a water reducing agent and a defoaming agent into a stirrer according to a ratio, and stirring for 2min to enable the materials to be in a uniform state; adding steel fiber, stirring for 2min to disperse the steel fiber in the slurry, adding water, and stirring for 5min to obtain slurry with homogeneous and fluid state.
The prepared UHPC slurry is subjected to slump expansion testing, and the slump expansion testing method refers to standard GB/T50080-2016 of a common concrete mixture performance testing method; after the work performance of the UHPC is tested, the UHPC is put into a triple die with the thickness of 40mm x 160mm, the die is removed after the UHPC is placed in a standard curing room with the temperature of 20 ℃ and the relative humidity of more than 95 percent for curing for 24 hours, the UHPC test block is continuously placed in a standard curing room for curing, and after the curing reaches the design age, the mechanical property is tested, and the test method of the mechanical property refers to the method for testing the strength of cement mortar 17671-1999 (ISO method).
Comparative example 1: (use of ordinary encrypted silica fume)
Weighing the raw materials according to the following single mixing amount proportion:
664.3kg of cement, 145kg of silica fume, 207kg of fly ash fine settled beads, 30kg of mineral dispersing agent, 1040kg of multistage matched quartz sand, 120kg of copper-plated microwire straight steel fiber, 9.6kg of high-performance polycarboxylic acid water reducing agent solid powder, 1.53kg of defoaming agent solid powder and 186kg of water;
the cement is Portland cement or ordinary Portland cement with the strength grade of 52.5, and the specific surface area of the cement is 400-450m2Per kg, the average particle diameter of the particles is 15-17 mu m; the silica fume is common encrypted silica fume, the 28d activity index of the silica fume is 110 percent, the water requirement is 125 percent, and the bulk density of the silica fume is 750-3(ii) a The particle shape of the fine precipitated beads of the fly ash is standard spherical, and the bulk density is 700-750kg/m3The particle grading is continuous particle distribution, the fineness is less than or equal to 5 percent, the water demand ratio is less than or equal to 90 percent, and the activity of 28 is more than or equal to 80 percent; the mineral dispersant is hydrophobic modified SiO2Pulverizing; the grading of the multi-grade quartz sand is 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes respectively, and the proportion of the grading is respectively 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes is 4:3:2: 1; the steel fiber is a copper-plated micro-wire straight steel fiber, the length of the straight steel fiber is 12-14mm, the diameter is 0.18-0.23mm, and the tensile strength is 2850 and 3050 MPa; the water reducing rate of the high-performance polycarboxylate superplasticizer solid powder is 40%.
Adding cement, silica fume, fine precipitated beads of fly ash, quartz sand, a mineral dispersant, a water reducing agent and a defoaming agent into a stirrer according to a ratio, and stirring for 2min to enable the materials to be in a uniform state; adding steel fiber, stirring for 2min to disperse the steel fiber in the slurry, adding water, and stirring for 5min to obtain slurry with homogeneous and fluid state.
The prepared UHPC slurry is subjected to slump expansion testing, and the slump expansion testing method refers to standard GB/T50080-2016 of a common concrete mixture performance testing method; after the work performance of the UHPC is tested, the UHPC is put into a triple die with the thickness of 40mm x 160mm, the die is removed after the UHPC is placed in a standard curing room with the temperature of 20 ℃ and the relative humidity of more than 95 percent for curing for 24 hours, the UHPC test block is continuously placed in a standard curing room for curing, and after the curing reaches the design age, the mechanical property is tested, and the test method of the mechanical property refers to the method for testing the strength of cement mortar 17671-1999 (ISO method).
Comparative example 2: (common fly ash is used as fly ash)
Weighing the raw materials according to the following single mixing amount proportion:
664.3kg of cement, 153.3kg of silica fume, 204.4kg of fly ash, 20kg of mineral dispersant, 1060kg of multistage matched quartz sand, 160kg of copper-plated micro-wire straight steel fiber, 8.7kg of high-performance polycarboxylate superplasticizer solid powder, 1.53kg of defoamer solid powder and 184kg of water;
the cement is Portland cement or ordinary Portland cement with the strength grade of 52.5, and the specific surface area of the cement is 400-450m2Per kg, the average particle diameter of the particles is 15-17 mu m; the silica fume is unencrypted silica fume, and the bulk density is 340-3，SiO2The content is more than or equal to 98 percent, and the specific surface area is 20000-25000m2Per kg, the average grain diameter is less than or equal to 0.1 mu m, the 28d activity index is more than or equal to 110 percent, and the water demand ratio is less than or equal to 106 percent; the fly ash is II-grade ash, the 28d activity index of the fly ash is 79 percent, and the water demand ratio is 103 percent; the mineral dispersant is hydrophobic modified SiO2Pulverizing; the grading of the multi-grade quartz sand is 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes respectively, and the proportion of the grading is respectively 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes is 4:3:2: 1; the steel fiber is a copper-plated micro-wire straight steel fiber, the length of the straight steel fiber is 12-14mm, the diameter is 0.18-0.23mm, and the tensile strength is 2850 and 3050 MPa; the water reducing rate of the high-performance polycarboxylate superplasticizer solid powder is 40%.
Adding cement, silica fume, fine precipitated beads of fly ash, quartz sand, a mineral dispersant, a water reducing agent and a defoaming agent into a stirrer according to a ratio, and stirring for 2min to enable the materials to be in a uniform state; adding steel fiber, stirring for 2min to disperse the steel fiber in the slurry, adding water, and stirring for 5min to obtain slurry with homogeneous and fluid state.
The prepared UHPC slurry is subjected to slump expansion testing, and the slump expansion testing method refers to standard GB/T50080-2016 of a common concrete mixture performance testing method; after the work performance of the UHPC is tested, the UHPC is put into a triple die with the thickness of 40mm x 160mm, the die is removed after the UHPC is placed in a standard curing room with the temperature of 20 ℃ and the relative humidity of more than 95 percent for curing for 24 hours, the UHPC test block is continuously placed in a standard curing room for curing, and after the curing reaches the design age, the mechanical property is tested, and the test method of the mechanical property refers to the method for testing the strength of cement mortar 17671-1999 (ISO method).
Comparative example 3:
weighing the raw materials according to the following single mixing amount proportion:
664.3kg of cement, 200kg of silica fume, 149kg of fly ash fine settled beads, 20kg of mineral dispersant, 1060kg of multistage matched quartz sand, 160kg of copper-plated micro-wire straight steel fibers, 8.7kg of high-performance polycarboxylate superplasticizer solid powder, 1.53kg of defoamer solid powder and 184kg of water;
the cement is Portland cement or ordinary Portland cement with the strength grade of 52.5, and the specific surface area of the cement is 400-450m2Per kg, the average particle diameter of the particles is 15-17 mu m; the silica fume is unencrypted silica fume, and the bulk density is 340-3，SiO2The content is more than or equal to 98 percent, and the specific surface area is 20000-25000m2Per kg, the average grain diameter is less than or equal to 0.1 mu m, the 28d activity index is more than or equal to 110 percent, and the water demand ratio is less than or equal to 106 percent; the particle shape of the fine precipitated beads of the fly ash is standard spherical, and the bulk density is 700-750kg/m3The particle grading is continuous particle distribution, the fineness is less than or equal to 5 percent, the water demand ratio is less than or equal to 90 percent, and the activity of 28 is more than or equal to 80 percent; the mineral dispersant is hydrophobic modified SiO2Pulverizing; the grading of the multi-grading quartz sand is 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes respectively, and the proportion of the multi-grading quartz sand is respectively 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes, namely 4:3:2:1(ii) a The steel fiber is a copper-plated micro-wire straight steel fiber, the length of the straight steel fiber is 12-14mm, the diameter is 0.18-0.23mm, and the tensile strength is 2850 and 3050 MPa; the water reducing rate of the high-performance polycarboxylate superplasticizer solid powder is 40%.
Adding cement, silica fume, fine precipitated beads of fly ash, quartz sand, a mineral dispersant, a water reducing agent and a defoaming agent into a stirrer according to a ratio, and stirring for 2min to enable the materials to be in a uniform state; adding steel fiber, stirring for 2min to disperse the steel fiber in the slurry, adding water, and stirring for 5min to obtain slurry with homogeneous and fluid state.
The prepared UHPC slurry is subjected to slump expansion testing, and the slump expansion testing method refers to standard GB/T50080-2016 of a common concrete mixture performance testing method; after the work performance of the UHPC is tested, the UHPC is put into a triple die with the thickness of 40mm x 160mm, the die is removed after the UHPC is placed in a standard curing room with the temperature of 20 ℃ and the relative humidity of more than 95 percent for curing for 24 hours, the UHPC test block is continuously placed in a standard curing room for curing, and after the curing reaches the design age, the mechanical property is tested, and the test method of the mechanical property refers to the method for testing the strength of cement mortar 17671-1999 (ISO method).
Comparative example 4:
weighing the raw materials according to the following single mixing amount proportion:
664.3kg of cement, 100kg of silica fume, 257kg of fly ash fine settled beads, 20kg of mineral dispersant, 1060kg of multistage complex quartz sand, 160kg of copper-plated micro-wire straight steel fiber, 8.7kg of high-performance polycarboxylate superplasticizer solid powder, 1.53kg of defoamer solid powder and 184kg of water;
the cement is Portland cement or ordinary Portland cement with the strength grade of 52.5, and the specific surface area of the cement is 400-450m2Per kg, the average particle diameter of the particles is 15-17 mu m; the silica fume is unencrypted silica fume, and the bulk density is 340-3，SiO2The content is more than or equal to 98 percent, and the specific surface area is 20000-25000m2Per kg, the average grain diameter is less than or equal to 0.1 mu m, the 28d activity index is more than or equal to 110 percent, and the water demand ratio is less than or equal to 106 percent; the particle shape of the fine precipitated beads of the fly ash is standard spherical, and the bulk density is 700-750kg/m3The grain composition is the continuous grain distribution with the fineness less than or equal to5 percent, the water demand ratio is less than or equal to 90 percent, and the activity of 28 percent is more than or equal to 80 percent; the mineral dispersant is hydrophobic modified SiO2Pulverizing; the grading of the multi-grade quartz sand is 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes respectively, and the proportion of the grading is respectively 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes is 4:3:2: 1; the steel fiber is a copper-plated micro-wire straight steel fiber, the length of the straight steel fiber is 12-14mm, the diameter is 0.18-0.23mm, and the tensile strength is 2850 and 3050 MPa; the water reducing rate of the high-performance polycarboxylate superplasticizer solid powder is 40%.
Adding cement, silica fume, fine precipitated beads of fly ash, quartz sand, a mineral dispersant, a water reducing agent and a defoaming agent into a stirrer according to a ratio, and stirring for 2min to enable the materials to be in a uniform state; adding steel fiber, stirring for 2min to disperse the steel fiber in the slurry, adding water, and stirring for 5min to obtain slurry with homogeneous and fluid state.
The prepared UHPC slurry is subjected to slump expansion testing, and the slump expansion testing method refers to standard GB/T50080-2016 of a common concrete mixture performance testing method; after the work performance of the UHPC is tested, the UHPC is put into a triple die with the thickness of 40mm x 160mm, the die is removed after the UHPC is placed in a standard curing room with the temperature of 20 ℃ and the relative humidity of more than 95 percent for curing for 24 hours, the UHPC test block is continuously placed in a standard curing room for curing, and after the curing reaches the design age, the mechanical property is tested, and the test method of the mechanical property refers to the method for testing the strength of cement mortar 17671-1999 (ISO method).
Comparative example 5: (without addition of mineral dispersants)
Weighing the raw materials according to the following single mixing amount proportion:
664.3kg of cement, 153.3kg of silica fume, 204.4kg of fly ash fine settled beads, 1060kg of multistage matched quartz sand, 160kg of copper-plated micro-wire straight steel fibers, 8.7kg of high-performance polycarboxylic acid water reducing agent solid powder, 1.53kg of defoaming agent solid powder and 184kg of water;
the cement is Portland cement or ordinary Portland cement with the strength grade of 52.5, and the specific surface area of the cement is 400-450m2Per kg, the average particle diameter of the particles is 15-17 mu m; the silica fume is unencrypted silica fume, and the bulk density is 340-3，SiO2The content is more than or equal to 98 percent, and the specific surface areaAccumulate 20000-2Per kg, the average grain diameter is less than or equal to 0.1 mu m, the 28d activity index is more than or equal to 110 percent, and the water demand ratio is less than or equal to 106 percent; the particle shape of the fine precipitated beads of the fly ash is standard spherical, and the bulk density is 700-750kg/m3The particle grading is continuous particle distribution, the fineness is less than or equal to 5 percent, the water demand ratio is less than or equal to 90 percent, and the activity of 28 is more than or equal to 80 percent; the grading of the multi-grade quartz sand is 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes respectively, and the proportion of the grading is respectively 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes is 4:3:2: 1; the steel fiber is a copper-plated micro-wire straight steel fiber, the length of the straight steel fiber is 12-14mm, the diameter is 0.18-0.23mm, and the tensile strength is 2850 and 3050 MPa; the water reducing rate of the high-performance polycarboxylate superplasticizer solid powder is 40%.
Adding cement, silica fume, fine precipitated beads of fly ash, quartz sand, a mineral dispersant, a water reducing agent and a defoaming agent into a stirrer according to a ratio, and stirring for 2min to enable the materials to be in a uniform state; adding steel fiber, stirring for 2min to disperse the steel fiber in the slurry, adding water, and stirring for 5min to obtain slurry with homogeneous and fluid state.
The prepared UHPC slurry is subjected to slump expansion testing, and the slump expansion testing method refers to standard GB/T50080-2016 of a common concrete mixture performance testing method; after the work performance of the UHPC is tested, the UHPC is put into a triple die with the thickness of 40mm x 160mm, the die is removed after the UHPC is placed in a standard curing room with the temperature of 20 ℃ and the relative humidity of more than 95 percent for curing for 24 hours, the UHPC test block is continuously placed in a standard curing room for curing, and after the curing reaches the design age, the mechanical property is tested, and the test method of the mechanical property refers to the method for testing the strength of cement mortar 17671-1999 (ISO method).
Comparative example 6: (mineral dispersant is not added, and the fly ash and the silica fume are common fly ash and silica fume)
Weighing the raw materials according to the following single mixing amount proportion:
664.3kg of cement, 153.3kg of silica fume, 204.4kg of fly ash fine settled beads, 1060kg of multistage matched quartz sand, 160kg of copper-plated micro-wire straight steel fibers, 8.7kg of high-performance polycarboxylic acid water reducing agent solid powder, 1.53kg of defoaming agent solid powder and 184kg of water;
the cement is strengthPortland cement or ordinary Portland cement with grade 52.5 and specific surface area of 400-450m2Per kg, the average particle diameter of the particles is 15-17 mu m; the silica fume is common encrypted silica fume, the 28d activity index of the silica fume is 110%, and the water demand is 125%; the fly ash is II-grade ash, the 28d activity index of the fly ash is 79 percent, and the water demand ratio is 103 percent; the grading of the multi-grade quartz sand is 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes respectively, and the proportion of the grading is respectively 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes is 4:3:2: 1; the steel fiber is a copper-plated micro-wire straight steel fiber, the length of the straight steel fiber is 12-14mm, the diameter is 0.18-0.23mm, and the tensile strength is 2850 and 3050 MPa; the water reducing rate of the high-performance polycarboxylate superplasticizer solid powder is 40%.
Adding cement, silica fume, fine precipitated beads of fly ash, quartz sand, a mineral dispersant, a water reducing agent and a defoaming agent into a stirrer according to a ratio, and stirring for 2min to enable the materials to be in a uniform state; adding steel fiber, stirring for 2min to disperse the steel fiber in the slurry, adding water, and stirring for 5min to obtain slurry with homogeneous and fluid state.
The prepared UHPC slurry is subjected to slump expansion testing, and the slump expansion testing method refers to standard GB/T50080-2016 of a common concrete mixture performance testing method; after the work performance of the UHPC is tested, the UHPC is put into a triple die with the thickness of 40mm x 160mm, the die is removed after the UHPC is placed in a standard curing room with the temperature of 20 ℃ and the relative humidity of more than 95 percent for curing for 24 hours, the UHPC test block is continuously placed in a standard curing room for curing, and after the curing reaches the design age, the mechanical property is tested, and the test method of the mechanical property refers to the method for testing the strength of cement mortar 17671-1999 (ISO method).
TABLE 1 concrete Properties obtained in examples and comparative examples
As can be seen from Table 1, the slump expansion degree of the slurry of the UHPC mixture can be ensured to be more than 840mm only when the mineral dispersant, the unencrypted silica fume and the precise bead setting of the fly ash are simultaneously added, and the compressive strength is more than 180 MPa.
Claims (6)
1. The high-flow-state ultrahigh-performance concrete is characterized by comprising the following raw materials in parts by weight: 680 parts of cement 620-containing material, 156 parts of silica fume 144-containing material, 210 parts of fly ash fine settled beads 190-containing material, 20-40 parts of mineral dispersant, 1075 parts of quartz sand 1030-containing material, 160 parts of steel fiber 120-containing material, 8.5-10.5 parts of water reducer, 1.4-1.6 parts of defoaming agent and 195 parts of water 165-containing material;
the silica fume is unencrypted silica fume, and the bulk density is 340-3，SiO2The content is more than or equal to 98 percent, and the specific surface area is 20000-25000m2Per kg, the average grain diameter is less than or equal to 0.1 mu m, the 28d activity index is more than or equal to 110 percent, and the water demand ratio is less than or equal to 106 percent;
the shape of the fine precipitated beads of the fly ash is spherical, and the bulk density is 750kg/m3The particle grading is continuous particle distribution, the fineness is less than or equal to 5 percent, the water demand ratio is less than or equal to 90 percent, and the activity of 28 is more than or equal to 80 percent;
the mineral dispersant is hydrophobic modified SiO2Powder, hydrophobically modified zeolite powder or a mixture of the two.
2. The high flow ultra high performance concrete of claim 1, wherein: the quartz sand is prepared in multiple stages, and the quartz sand is prepared in grades of 30-40 meshes, 40-70 meshes, 70-140 meshes and 300 meshes according to the ratio of 30-40 meshes to 40-70 meshes to 70-140 meshes to 300 meshes to 4:3:2: 1.
3. The high flow ultra high performance concrete of claim 1, wherein: the steel fiber is a copper-plated micro-wire straight steel fiber, the length of the straight steel fiber is 12-14mm, the diameter is 0.18-0.23mm, and the tensile strength is 2850 and 3050 MPa.
4. The high flow ultra high performance concrete of claim 1, wherein: the water reducing agent is a high-dispersion polycarboxylic acid water reducing agent and is white solid powder, and the water reducing rate is more than 35%.
5. The high flow ultra high performance concrete of claim 1, wherein: the defoaming agent is a polyether defoaming agent and is white solid powder.
6. The high flow ultra high performance concrete of claim 1, wherein: the cement is Portland cement or ordinary Portland cement with the strength grade of 52.5, and the specific surface area of the cement is 400-450m2Per kg, the average particle diameter of the particles is 15-17 μm.
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| CN115745498A (en) * | 2022-10-12 | 2023-03-07 | 中交二航武汉港湾新材料有限公司 | Low-viscosity large-flow-state ultrahigh-performance concrete and preparation method thereof |
| CN115745498B (en) * | 2022-10-12 | 2023-08-22 | 中交二航武汉港湾新材料有限公司 | Low-viscosity large-flow-state ultra-high-performance concrete and preparation method thereof |
| CN115991585A (en) * | 2023-02-23 | 2023-04-21 | 深圳国金电力新能设计院有限公司 | Reinforcement-cage-free wind power tower tube sheet and preparation method thereof |
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