CN116003052A - High-modulus ultra-high-performance concrete based on artificial high-strength aggregate and preparation method thereof - Google Patents
High-modulus ultra-high-performance concrete based on artificial high-strength aggregate and preparation method thereof Download PDFInfo
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 85
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000004567 concrete Substances 0.000 claims abstract description 63
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 29
- 238000003756 stirring Methods 0.000 claims abstract description 26
- 239000011325 microbead Substances 0.000 claims abstract description 24
- 239000010881 fly ash Substances 0.000 claims abstract description 23
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 230000000694 effects Effects 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000012615 aggregate Substances 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 19
- 229920005646 polycarboxylate Polymers 0.000 claims description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 11
- 239000004375 Dextrin Substances 0.000 claims description 10
- 229920001353 Dextrin Polymers 0.000 claims description 10
- 235000019425 dextrin Nutrition 0.000 claims description 10
- 238000011049 filling Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- 239000011398 Portland cement Substances 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 4
- 239000012798 spherical particle Substances 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims 1
- 238000010304 firing Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 3
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- 239000006004 Quartz sand Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
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- 230000001603 reducing effect Effects 0.000 description 2
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- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000004566 building material Substances 0.000 description 1
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- 239000010883 coal ash Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
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- 238000006703 hydration reaction Methods 0.000 description 1
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Classifications
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- 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
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Abstract
The invention provides high-modulus ultra-high-performance concrete based on artificial high-strength aggregate and a preparation method thereof. The concrete comprises cement, fly ash microbeads, silica fume, artificial high-strength aggregate, basalt coarse aggregate, copper-plated steel fiber, a water reducing agent and water; according to the invention, the ultra-high performance concrete is prepared by adopting the artificial high-strength aggregate, the problem of large shrinkage of the existing ultra-high performance concrete can be improved to a certain extent by utilizing the internal curing effect of the ultra-high performance concrete, and meanwhile, the slurry around the artificial high-strength aggregate is promoted to form a high-strength and compact interface transition zone by combining a pre-stirring process, so that the mechanical property and the durability of the high-modulus ultra-high performance concrete are improved; the elastic modulus of the high-modulus ultrahigh-performance concrete obtained by the method is 57-60 GPa, the compressive strength grade can reach more than C150, the high-modulus ultrahigh-performance concrete has good working performance, mechanical property and volume stability, the toughness, durability and elastic modulus of the concrete member can be effectively improved, and the high-modulus ultrahigh-performance concrete has important practical application value.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to high-modulus ultra-high-performance concrete based on artificial high-strength aggregate and a preparation method thereof.
Background
With the progress of cement science and technology and the need for high-strength light-weight construction, common concrete has not met the construction requirements of some bridge projects. In this case, ultra High Performance Concrete (UHPC) having better performance than ordinary concrete has been developed. UHPC is prepared by replacing cement with mineral admixture to optimize particle bulk density, reduce water-gel ratio and use steel fiber and additive, and has good fluidity and excellent mechanical properties. In addition, the excellent durability enables UHPC to resist erosion in coastal, saline-alkali areas. Therefore, UHPC has been frequently applied to infrastructure construction works such as road surfaces and bridge structures for more than twenty years.
At present, technical specifications and construction guidelines for UHPC materials and structural designs are successively formulated and issued in China, america and the like, and research and application of UHPC without coarse aggregate are relatively mature. However, UHPC has some disadvantages compared to ordinary concrete: 1) The influence factors of raw materials are complex, the consumption of the cementing material is large, the water-gel ratio is low, insufficient hydration and large early shrinkage are caused, and the durability and the strength of UHPC are negatively influenced; 2) The elastic modulus is not high, the compressive strength of UHPC is several times that of ordinary concrete, but the elastic modulus is only about 20% higher than that of ordinary concrete, so that the bridge structure is damaged excessively due to insufficient rigidity, the structural design is limited by the elastic modulus of UHPC, and the excellent compressive strength of UHPC cannot be effectively used. Therefore, development of concrete with high strength, high elastic modulus and low shrinkage is urgently needed to meet the development requirements of high strength and light weight of road and bridge structures in China.
Disclosure of Invention
In view of the above, the invention provides a high-modulus ultra-high performance concrete based on artificial high-strength aggregate and a preparation method thereof, so as to solve or partially solve the technical problems existing in the prior art.
In a first aspect, the invention provides high-modulus ultra-high-performance concrete based on artificial high-strength aggregate, which comprises the following raw materials in proportion: 600-700 kg/m of cement 3 120-200 kg/m of fly ash microbeads 3 150-200 kg/m of silica fume 3 800-1500 kg/m artificial high-strength aggregate 3 0-700 kg/m basalt coarse aggregate 3 100 kg/m to 250kg/m of copper-plated steel fiber 3 20-35 kg/m water reducer 3 170-220 kg/m of water 3 ；
The preparation method of the artificial high-strength aggregate comprises the following steps: mixing gangue, industrial alumina, dextrin and water, granulating, and preserving heat at 1500-1700 ℃ for 1-3 h to obtain the artificial high-strength aggregate.
Preferably, the high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate is prepared by the following steps: mixing gangue with industrial alumina, adding dextrin and water, and continuously mixing to obtain slurry;
granulating the slurry to obtain granules;
drying the pelleting material, and preserving heat for 1-3 hours at 1500-1700 ℃ to obtain the artificial high-strength aggregate.
Preferably, in the preparation step of the high-modulus ultra-high performance concrete based on the artificial high-strength aggregate, the mass ratio of the coal gangue to the industrial alumina to the dextrin to the water is (50-70): (25-45): (2-5): (3-7).
Preferably, the high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate is P.II 52.5 Portland cement.
Preferably, the high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate has the coal ash microbead loss on ignition less than or equal to 5.0%, the water demand ratio less than or equal to 90%, and the volume ratio of spherical particles more than or equal to 95%.
Preferably, the high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate contains SiO of the silica fume 2 The mass content is more than or equal to 95 percent, the specific surface area is more than or equal to 15500m 2 The activity index per kg and 28d is more than or equal to 100 percent.
Preferably, the high-modulus ultra-high performance concrete based on the artificial high-strength aggregate has the length of 8-12 mm, the diameter of 0.18-0.35 mm, the breaking strength of more than or equal to 3000Mpa and the elastic modulus of 40-60 Gpa.
Preferably, the high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate has the particle size of basalt coarse aggregate of 5-8mm and the crushing value of 5-9%.
Preferably, the high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate is a polycarboxylate water reducer.
In a second aspect, the invention also provides a preparation method of the high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate, which comprises the following steps:
soaking the artificial high-strength aggregate in water until the artificial high-strength aggregate is saturated with water;
stirring and mixing the soaked artificial high-strength aggregate, cement, silica fume and fly ash microbeads, adding part of water and a water reducing agent, continuously stirring, adding copper-plated steel fibers and the rest of water, stirring again, adding basalt coarse aggregate, continuously stirring, and carrying out die filling, vibrating and forming to obtain a concrete mixture;
covering the surface of the concrete mixture with a waterproof film, and then placing the concrete mixture into a curing chamber for curing to obtain the high-modulus ultrahigh-performance concrete.
The high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate and the preparation method thereof have the following beneficial effects compared with the prior art:
the preparation method of the high-modulus ultra-high performance concrete based on the artificial high-strength aggregate adopts the artificial high-strength aggregateThe preparation of the ultra-high performance concrete can utilize the internal curing effect to improve the problem of large shrinkage of the existing ultra-high performance concrete to a certain extent, and simultaneously promote the slurry around the artificial high-strength aggregate to form a high-strength and compact interface transition zone by combining a pre-mixing process, so that the mechanical property and the durability of the high-modulus ultra-high performance concrete are improved; mineral admixture such as polycarboxylate water reducer, fly ash microbeads and the like is adopted to optimize the working performance of the concrete mixture, improve the compactness and homogeneity of the concrete, further reduce the shrinkage of the concrete and improve the mechanical property and the volume stability of the high-modulus ultra-high-performance concrete; the invention combines the shrinkage reduction of basalt coarse aggregate and the internal curing effect of artificial high-strength aggregate, effectively improves the cracking resistance and the volume stability of the ultra-high performance concrete, can optimize the pore structure of the concrete and improves the durability of the concrete; the total content of alumina in the artificial high-strength aggregate adopted by the invention accounts for more than 60 percent of the total element content of the fine aggregate, and the elastic modulus of UHPC can be effectively improved by doping the artificial high-strength aggregate; the apparent density of the high-modulus ultra-high performance concrete obtained by the invention is 2500-2700 kg/m 3 The elastic modulus is 57-60 GPa, the compressive strength grade can reach more than C150, the concrete member has good working performance, mechanical property and volume stability, the toughness, durability and elastic modulus of the concrete member can be effectively improved, and the concrete member has important practical application value.
Detailed Description
The following description of the embodiments of the present invention will be made in detail and with reference to the embodiments of the present invention, but it should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
The embodiment of the application provides high-modulus ultra-high-performance concrete based on artificial high-strength aggregate, which comprises the following raw materials in proportion: 600-700 kg/m of cement 3 120-200 kg/m of fly ash microbeads 3 150-200 kg/m of silica fume 3 800-1500 kg/m artificial high-strength aggregate 3 0-700 kg/m basalt coarse aggregate 3 100 kg/m to 250kg/m of copper-plated steel fiber 3 20-35 kg/m water reducer 3 170-220 kg/m of water 3 ；
The preparation method of the artificial high-strength aggregate comprises the following steps: mixing gangue, industrial alumina, dextrin and water, granulating, and preserving heat at 1500-1700 ℃ for 1-3 h to obtain the artificial high-strength aggregate.
In some embodiments, the method of making the artificial high strength aggregate is: mixing gangue with industrial alumina, adding dextrin and water, and continuously mixing to obtain slurry;
granulating the slurry to obtain granules;
drying the pelleting material, and preserving heat for 1-3 hours at 1500-1700 ℃ to obtain the artificial high-strength aggregate.
Specifically, in the above examples, the particle size of the pellets was 2 to 10mm, the drying temperature of the pellets was 100 to 120℃and the drying time was 1 to 3 hours.
In some embodiments, in the preparation step of the artificial high-strength aggregate, the mass ratio of the gangue to the industrial alumina to the dextrin to the water is (50-70): (25-45): (2-5): (3-7).
The artificial high-strength aggregate prepared by the embodiment has the alumina mass content of more than 60 percent and apparent density of 2555 to 2565kg/m 3 The saturated dry water absorption rate is 5-7%.
In some embodiments, the cement is p.ii 52.5 portland cement.
In some embodiments, the fly ash microbeads have a loss on ignition of 5.0% or less, a water demand ratio of 90% or less, and a spherical particle volume fraction of 95% or more.
In some embodiments, siO of the silica fume 2 The mass content is more than or equal to 95 percent, the specific surface area is more than or equal to 15500m 2 The activity index per kg and 28d is more than or equal to 100 percent.
In some embodiments, the copper plated steel fibers have a length of 8-12 mm, a diameter of 0.18-0.35 mm, a breaking strength of greater than or equal to 3000Mpa, and an elastic modulus of 40-60 Gpa.
In some embodiments, the basalt coarse aggregate particle size is 5-8mm and the crush value is 5-9%.
In some embodiments, the water reducing agent is a polycarboxylate water reducing agent.
In some embodiments, the water is normal tap water, meeting the requirements of JGJ63, water for concrete.
According to the invention, the artificial high-strength aggregate is adopted to prepare the high-elasticity-modulus ultrahigh-performance concrete, so that on one hand, the content of the high-elasticity-modulus component in the UHPC material can be effectively improved, and the elasticity modulus of the UHPC material is improved; on the other hand, the artificial high-strength aggregate shows a large number of fine communication holes, the structure not only improves the bonding strength between the artificial high-strength aggregate and the cement mortar, but also has an internal curing effect, and the artificial high-strength aggregate soaked by clear water slowly releases internal moisture along with the extension of time after the concrete is formed, so that the concrete is fully internally cured, the self-shrinkage and the drying shrinkage of the concrete are greatly reduced, and meanwhile, the compactness and the strength of the concrete are improved; siO in silica fume 2 The mass content is above 95%, and most of the material is amorphous SiO 2 Has high pozzolanic activity; meanwhile, the silica fume particles are mainly amorphous spherical particles, the average particle diameter is in the level of 0.1-0.2 mu m, the viscosity resistance of the silica fume is high, segregation and bleeding of the fresh concrete are obviously improved, and the viscosity of the fresh concrete is increased; the invention can effectively improve the fluidity and uniformity of fresh concrete by adding the fly ash microbeads and utilizing the ball effect, filling and water reducing effects of the fly ash microbeads, and can fill and refine the gaps and capillary holes in the concrete at the same time, thereby improving the mechanical property and durability of the concrete.
Based on the same inventive concept, the embodiment of the application also provides a preparation method of the high-modulus ultrahigh-performance concrete based on the artificial high-strength aggregate, which comprises the following steps:
s1, immersing the artificial high-strength aggregate in water until the artificial high-strength aggregate is saturated with water;
s2, stirring and mixing the soaked artificial high-strength aggregate, cement, silica fume and fly ash microbeads, then adding part of water and a water reducing agent, continuously stirring, adding copper-plated steel fibers and the rest of water, stirring again, adding basalt coarse aggregate, continuously stirring, and carrying out die filling, vibration and molding to obtain a concrete mixture;
s3, covering the surface of the concrete mixture with a waterproof film, and then placing the concrete mixture into a curing room for curing to obtain the high-modulus ultrahigh-performance concrete.
Specifically, adding the soaked artificial high-strength aggregate, cement, silica fume and fly ash microbeads into a concrete mixer, pre-mixing for 1-3 min, then pouring 70-80% (mass fraction) of water and a polycarboxylate water reducer, wet-mixing for 3-5 min, then adding copper-plated steel fibers and the rest of water, uniformly mixing, and finally pouring basalt coarse aggregate, and stirring for 3-7 min; filling the mould, vibrating and forming to obtain a concrete mixture; and (3) covering the surface with a waterproof film to cover the surface of the concrete mixture, removing the mold after film curing, and finally carrying out standard curing or steam curing until the specified age to obtain the high-modulus ultrahigh-performance concrete.
According to the preparation method of the high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate, the artificial high-strength aggregate is adopted to prepare the ultra-high-performance concrete, so that the problem of large shrinkage of the existing ultra-high-performance concrete can be improved to a certain extent by utilizing the internal curing effect of the ultra-high-performance concrete, and meanwhile, the slurry around the artificial high-strength aggregate is promoted to form a high-strength and compact interface transition zone by combining a pre-mixing process, so that the mechanical property and the durability of the high-modulus ultra-high-performance concrete are improved; mineral admixture such as polycarboxylate water reducer, fly ash microbeads and the like is adopted to optimize the working performance of the concrete mixture, improve the compactness and homogeneity of the concrete, further reduce the shrinkage of the concrete and improve the mechanical property and the volume stability of the high-modulus ultra-high-performance concrete; the invention combines the shrinkage reduction of basalt coarse aggregate and the internal curing effect of artificial high-strength aggregate, effectively improves the cracking resistance and the volume stability of the ultra-high performance concrete, can optimize the pore structure of the concrete and improves the durability of the concrete; the total content of alumina in the artificial high-strength aggregate adopted by the invention accounts for more than 60 percent of the total element content of the fine aggregate, and the elastic modulus of UHPC can be effectively improved by doping the artificial high-strength aggregate; the invention has the advantages of high modulus and superhigh intensityThe apparent density of the performance concrete is 2500-2700 kg/m 3 The elastic modulus is 57-60 GPa, the compressive strength grade can reach more than C150, the concrete member has good working performance, mechanical property and volume stability, the toughness, durability and elastic modulus of the concrete member can be effectively improved, and the concrete member has important practical application value.
The high modulus ultra-high performance concrete based on the artificial high strength aggregate and the preparation method thereof of the present application are further described in the following specific examples. This section further illustrates the summary of the invention in connection with specific embodiments, but should not be construed as limiting the invention. The technical means employed in the examples are conventional means well known to those skilled in the art, unless specifically stated. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
In the following examples and comparative examples, hubei Wa stone P.II 52.5 Portland cement was used as the cement; silica fume is produced by Sichuan Langmuir resource comprehensive utilization company, siO 2 The mass content is 95%, the specific surface area is 19000m 2 105% of the activity index per kg,28 d; fly ash microbeads are provided by Tianjin building new material technology Co.Ltd, and have specific surface area of 1200m 2 A/kg, 28d activity index > 90%, amorphous; the copper-plated steel fiber is produced by new material technology limited company of new engineering in Wuhan, the nominal length is 12mm, the equivalent diameter is 0.20mm, the breaking strength is about 3500MPa, and the elastic modulus is about 52 GPa; basalt is produced by Yichang company in Hubei, has grain size of 5-8mm and apparent density of 2900kg/m 3 Crush value 7.2%; the water reducer adopts a polycarboxylic acid high-performance water reducer with high water reducing rate and low air entraining amount, wherein the solid content of the polycarboxylic acid high-performance water reducer is 50 percent, and the polycarboxylic acid high-performance water reducer is produced by first-sincerity limited engineering of industry; the water is common tap water.
The preparation method of the artificial high-strength aggregate used in the following examples includes the following steps:
mixing coal gangue and industrial alumina in a ball mill of 240r/min for 40min, adding dextrin and water, and uniformly mixing to obtain slurry;
granulating the slurry in a granulator to obtain granules with the particle size of 5 mm;
drying the pelleting material at 110 ℃ for 12 hours, and then preserving heat for 2 hours at 1600 ℃ to obtain the artificial high-strength aggregate.
Example 1
The embodiment of the application provides high-modulus ultra-high-performance concrete based on artificial high-strength aggregate, which comprises the following raw materials in proportion: 625kg/m cement 3 Fly ash microbeads 135kg/m 3 165kg/m of silica fume 3 800kg/m artificial high-strength aggregate 3 500kg/m basalt coarse aggregate 3 160kg/m copper-plated steel fiber 3 Polycarboxylate water reducer 30kg/m 3 204kg/m of water 3 。
The preparation method of the high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate comprises the following steps of: s1, immersing the artificial high-strength aggregate in water until the artificial high-strength aggregate is saturated with water;
s2, adding the soaked artificial high-strength aggregate, cement, silica fume and fly ash microbeads into a concrete mixer, pre-stirring for 3min, and then pouring 153kg/m 3 Is mixed with the polycarboxylate water reducer for 5min, and copper-plated steel fiber and 51kg/m of the polycarboxylate water reducer are added 3 Uniformly stirring the water in the step (a), and finally pouring basalt coarse aggregate and stirring for 5min; filling the mould, vibrating and forming to obtain a concrete mixture;
s3, covering the surface of the concrete mixture with a waterproof film, removing the mold after film curing, and finally performing standard curing to obtain the high-modulus ultrahigh-performance concrete.
Example 2
The embodiment of the application provides high-modulus ultra-high-performance concrete based on artificial high-strength aggregate, which comprises the following raw materials in proportion: cement 600kg/m 3 115kg/m fly ash microbeads 3 130kg/m of silica fume 3 887kg/m of artificial high-strength aggregate 3 500kg/m basalt coarse aggregate 3 160kg/m copper-plated steel fiber 3 Polycarboxylate water reducer 30kg/m 3 204kg/m of water 3 。
The preparation method of the high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate comprises the following steps of: s1, immersing the artificial high-strength aggregate in water until the artificial high-strength aggregate is saturated with water;
s2, adding the soaked artificial high-strength aggregate, cement, silica fume and fly ash microbeads into a concrete mixer, pre-stirring for 3min, and then pouring 153kg/m 3 Is mixed with the polycarboxylate water reducer for 5min, and copper-plated steel fiber and 51kg/m of the polycarboxylate water reducer are added 3 Uniformly stirring the water in the step (a), and finally pouring basalt coarse aggregate and stirring for 5min; filling the mould, vibrating and forming to obtain a concrete mixture;
s3, covering the surface of the concrete mixture with a waterproof film, removing the mold after film curing, and finally performing standard curing to obtain the high-modulus ultrahigh-performance concrete.
Example 3
The embodiment of the application provides high-modulus ultra-high-performance concrete based on artificial high-strength aggregate, which comprises the following raw materials in proportion: cement 600kg/m 3 Fly ash microbeads 150kg/m 3 180kg/m of silica fume 3 735kg/m of artificial high-strength aggregate 3 500kg/m basalt coarse aggregate 3 160kg/m copper-plated steel fiber 3 28.25kg/m of polycarboxylate superplasticizer 3 192kg/m of water 3 。
The preparation method of the high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate comprises the following steps of: s1, immersing the artificial high-strength aggregate in water until the artificial high-strength aggregate is saturated with water;
s2, adding the soaked artificial high-strength aggregate, cement, silica fume and fly ash microbeads into a concrete mixer, pre-stirring for 3min, and then pouring 144kg/m 3 Is mixed with the polycarboxylate water reducer for 5min, and copper-plated steel fiber and 48kg/m are added 3 Uniformly stirring the water in the step (a), and finally pouring basalt coarse aggregate and stirring for 5min; filling the mould, vibrating and forming to obtain a concrete mixture;
s3, covering the surface of the concrete mixture with a waterproof film, removing the mold after film curing, and finally performing standard curing to obtain the high-modulus ultrahigh-performance concrete.
Comparative example 1
The comparative example provides a concrete, which comprises the following raw materials in proportion: 625kg/m cement 3 Fly ash microbeads 135kg/m 3 165kg/m of silica fume 3 869kg/m quartz sand 3 500kg/m basalt coarse aggregate 3 160kg/m copper-plated steel fiber 3 Polycarboxylate water reducer 30kg/m 3 204kg/m of water 3 。
The preparation method of the high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate comprises the following steps of:
s1, adding quartz sand, cement, silica fume and fly ash microbeads into a concrete mixer, pre-stirring for 3min, and then pouring 153kg/m 3 Is mixed with the polycarboxylate water reducer for 5min, and copper-plated steel fiber and 51kg/m of the polycarboxylate water reducer are added 3 Uniformly stirring the water in the step (a), and finally pouring basalt coarse aggregate and stirring for 5min; filling the mould, vibrating and forming to obtain a concrete mixture;
s2, covering the surface of the concrete mixture with a waterproof film, removing the mold after film curing, and finally performing standard curing to obtain the concrete.
Performance testing
The concrete properties prepared in examples 1 to 3 and comparative example 1 were tested, and the results are shown in Table 1 below.
TABLE 1 Properties of the concrete prepared in the different examples
The result shows that the high-modulus ultrahigh-performance concrete has good working performance, mechanical performance and volume stability, the elastic modulus of the high-modulus ultrahigh-performance concrete is more than 57GPa, the elastic modulus of the high-modulus ultrahigh-performance concrete is increased by more than 10 percent compared with the elastic modulus of the ultrahigh-performance concrete without the artificial high-strength aggregate, the compressive strength grade can reach more than C150, and the high-toughness ultrahigh-performance concrete has good volume stability.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. The high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate is characterized by comprising the following raw materials in proportion: 600-700 kg/m of cement 3 120-200 kg/m of fly ash microbeads 3 150-200 kg/m of silica fume 3 800-1500 kg/m artificial high-strength aggregate 3 0-700 kg/m basalt coarse aggregate 3 100 kg/m to 250kg/m of copper-plated steel fiber 3 20-35 kg/m water reducer 3 170-220 kg/m of water 3 ；
The preparation method of the artificial high-strength aggregate comprises the following steps: mixing gangue, industrial alumina, dextrin and water, granulating, and preserving heat at 1500-1700 ℃ for 1-3 h to obtain the artificial high-strength aggregate.
2. The high modulus, ultra-high performance concrete based on artificial high strength aggregate according to claim 1, wherein the artificial high strength aggregate is prepared by the steps of: mixing gangue with industrial alumina, adding dextrin and water, and continuously mixing to obtain slurry;
granulating the slurry to obtain granules;
drying the pelleting material, and preserving heat for 1-3 hours at 1500-1700 ℃ to obtain the artificial high-strength aggregate.
3. The high-modulus ultra-high performance concrete based on artificial high strength aggregate according to claim 1, wherein in the preparation step of the artificial high strength aggregate, the mass ratio of the gangue, the industrial alumina, the dextrin and the water is (50-70): (25-45): (2-5): (3-7).
4. The high modulus, ultra high performance concrete based on artificial high strength aggregate according to claim 1, wherein the cement is p.ii 52.5 portland cement.
5. The high-modulus ultra-high performance concrete based on the artificial high-strength aggregate according to claim 1, wherein the firing loss of the fly ash microbeads is less than or equal to 5.0%, the water demand ratio is less than or equal to 90%, and the volume ratio of the spherical particles is more than or equal to 95%.
6. The high modulus, ultra high performance concrete based on artificial high strength aggregate according to claim 1, wherein the silica fume has a SiO 2 The mass content is more than or equal to 95 percent, the specific surface area is more than or equal to 15500m 2 The activity index per kg and 28d is more than or equal to 100 percent.
7. The high-modulus ultrahigh-performance concrete based on the artificial high-strength aggregate according to claim 1, wherein the copper-plated steel fibers have a length of 8-12 mm, a diameter of 0.18-0.35 mm, a breaking strength of not less than 3000Mpa and an elastic modulus of 40-60 Gpa.
8. The high modulus ultra high performance concrete based on artificial high strength aggregate according to claim 1, wherein the basalt coarse aggregate particle size is 5-8mm and the crush value is 5-9%.
9. The high modulus, ultra high performance concrete based on artificial high strength aggregate according to any of claims 1 to 8, wherein the water reducing agent is a polycarboxylate water reducing agent.
10. A method for preparing the high-modulus ultra-high-performance concrete based on the artificial high-strength aggregate according to any one of claims 1 to 9, comprising the following steps:
soaking the artificial high-strength aggregate in water until the artificial high-strength aggregate is saturated with water;
stirring and mixing the soaked artificial high-strength aggregate, cement, silica fume and fly ash microbeads, adding part of water and a water reducing agent, continuously stirring, adding copper-plated steel fibers and the rest of water, stirring again, adding basalt coarse aggregate, continuously stirring, and carrying out die filling, vibrating and forming to obtain a concrete mixture;
covering the surface of the concrete mixture with a waterproof film, and then placing the concrete mixture into a curing chamber for curing to obtain the high-modulus ultrahigh-performance concrete.
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