CN117142814A - Gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete and preparation method thereof - Google Patents
Gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete and preparation method thereof Download PDFInfo
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- CN117142814A CN117142814A CN202310979449.6A CN202310979449A CN117142814A CN 117142814 A CN117142814 A CN 117142814A CN 202310979449 A CN202310979449 A CN 202310979449A CN 117142814 A CN117142814 A CN 117142814A
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- phosphogypsum
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- lightweight aggregate
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- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims abstract description 121
- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 84
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 80
- 239000004576 sand Substances 0.000 claims abstract description 74
- 239000010881 fly ash Substances 0.000 claims abstract description 37
- 239000004568 cement Substances 0.000 claims abstract description 36
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 23
- 238000007667 floating Methods 0.000 claims abstract description 21
- 239000011324 bead Substances 0.000 claims abstract description 20
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 19
- 239000000835 fiber Substances 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000010949 copper Substances 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- 239000012615 aggregate Substances 0.000 claims description 105
- 239000000843 powder Substances 0.000 claims description 27
- 229910021389 graphene Inorganic materials 0.000 claims description 25
- 239000002994 raw material Substances 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 18
- 229920006395 saturated elastomer Polymers 0.000 claims description 17
- 239000002002 slurry Substances 0.000 claims description 15
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 14
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 14
- 239000004571 lime Substances 0.000 claims description 14
- 239000011707 mineral Substances 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 239000011734 sodium Substances 0.000 claims description 10
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 9
- 239000004567 concrete Substances 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 9
- 229910052708 sodium Inorganic materials 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical class [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 abstract description 5
- 239000002910 solid waste Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 9
- 238000009792 diffusion process Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000004888 barrier function Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 239000002440 industrial waste Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000012216 screening Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 210000001161 mammalian embryo Anatomy 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 235000019353 potassium silicate Nutrition 0.000 description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 3
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000013530 defoamer Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910021532 Calcite Inorganic materials 0.000 description 1
- JLFVIEQMRKMAIT-UHFFFAOYSA-N ac1l9mnz Chemical compound O.O.O JLFVIEQMRKMAIT-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/043—Alkaline-earth metal silicates, e.g. wollastonite
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/027—Lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0409—Waste from the purification of bauxite, e.g. red mud
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
- C04B18/082—Cenospheres
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1066—Oxides, Hydroxides
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/143—Calcium-sulfate
- C04B22/144—Phosphogypsum
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete, each component and the content thereof comprise: 600-700kg/m of cement 3 100-150kg/m of fly ash 3 150-200kg/m of silica fume 3 Modified gamma-C 2 200-400kg/m S phosphogypsum baking-free aggregate 3 80-100kg/m copper plated steel fiber 3 300-700kg/m of medium sand 3 Floating beads 40-92kg/m 3 260-608kg/m of fine sand 3 8-15kg/m water reducer 3 0.5-2kg/m of defoaming agent 3 150-190kg/m of water 3 . The ultra-high performance concrete has the advantages of small density, low self-shrinkage, excellent working performance, mechanical property and the like, is favorable for promoting the application of industrial solid waste lightweight aggregate in UHPC, has obvious environmental and economic benefits, and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of building materials, and in particular relates to a gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete and a preparation method thereof.
Background
Along with the building industryThe development of energy conservation and emission reduction, the utilization of industrial waste and the development and optimization of calcium silicate products are widely focused. Baking-free gamma-C with phosphogypsum as main component 2 S phosphogypsum lightweight aggregate can be used for replacing nonrenewable crushed stone resources, can realize comprehensive utilization of mineral powder and solid waste, and effectively solves the problems of land resource waste, environmental pollution and the like caused by the solid waste. However, phosphogypsum is porous and easy to absorb water, and calcium sulfate dihydrate of the phosphogypsum is easy to dissolve in water, so that the phosphogypsum strength is easy to be greatly reduced; the existing baking-free phosphogypsum ceramsite ball generally has the problems of low cylinder pressure intensity, high dead weight, water softening and the like, and limits the popularization and application of the phosphogypsum ceramsite ball.
At present, common high-performance concrete has high density and low strength, and the prefabricated members of the bridge have large size and self weight, so that the transportation and hoisting construction of the bridge are difficult, and the development and application of the prefabricated assembly construction technology are limited. There is a need to develop a lightweight ultra-high performance concrete material with high strength, high impact toughness and good volume stability, so as to further reduce the dead weight of the bridge structure and increase the span of the bridge, and meanwhile, facilitate transportation and hoisting of construction equipment, realize rapid construction of prefabricated assembled bridges, and meet the continuously improved construction requirements.
Disclosure of Invention
The main object of the present invention is to provide a gamma-C for solving the problems and disadvantages of the prior art 2 S phosphogypsum lightweight aggregate ultra-high performance concrete has small density and low self-shrinkage, can give consideration to excellent working performance, mechanical property and the like, is favorable for promoting the application research of industrial solid waste lightweight aggregate in UHPC, has remarkable environmental and economic benefits, and is suitable for popularization and application.
In order to achieve the above purpose, the invention adopts the following technical scheme:
Gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete, each component and the content thereof comprise: 600-700kg/m of cement 3 100-150kg/m of fly ash 3 150-200kg/m of silica fume 3 Modified gamma-C 2 S phosphogypsum baking-free lightweight aggregate 200-400kg/m 3 80-100kg/m copper plated steel fiber 3 300-700kg/m of medium sand 3 Floating bead40-92kg/m 3 260-608kg/m of fine sand 3 8-15kg/m water reducer 3 0.5-2kg/m of defoaming agent 3 150-190kg/m of water 3 The method comprises the steps of carrying out a first treatment on the surface of the The modified gamma-C 2 S phosphogypsum baking-free lightweight aggregate in gamma-C 2 S, phosphogypsum, fly ash, mineral powder, red mud powder, sodium metaaluminate and water are taken as main raw materials, and are mixed, pressed and crushed to obtain gamma-C 2 S phosphogypsum-based lightweight aggregate is obtained by curing with saturated lime water-graphene cement slurry.
In the scheme, each component in the saturated lime water-graphene cement comprises the following components in percentage by mass: 0.02-0.03% of graphene, 35-45% of cement and 55-75% of saturated lime water; the preparation method comprises the following steps:
1) Mixing the weighed graphene and saturated lime water in proportion, and uniformly stirring by ultrasonic to obtain graphene dispersion liquid;
2) And uniformly mixing the graphene dispersion liquid and cement in proportion to obtain the saturated lime water-graphene cement slurry.
In the above scheme, the maximum radial dimension of the graphene is 1-100 μm.
In the scheme, the ultrasonic stirring time is 20-40min.
In the scheme, the curing time of the saturated lime water-graphene cement slurry is 18-24 hours.
In the above scheme, the gamma-C 2 The S phosphogypsum-based lightweight aggregate comprises the following raw materials in percentage by mass: phosphogypsum 43-48%, gamma-C 2 21.5-28% of S, 8-13% of fly ash, 5-10% of mineral powder, 3-5% of red mud powder, 1-3% of sodium metaaluminate and 5-7% of water.
In the above scheme, the gamma-C 2 The particle size of S is 1.5-45 μm and the purity is higher than 99%.
Further, the pH value of phosphogypsum is more than 3.0, and the 80um screen allowance is not more than 20%; the main chemical components and the mass percentages thereof are as follows: caO 37-41%, SO 3 40-43%; the red mud powder is obtained by drying red mud (natural water content is 32-36%) and grinding, and has a particle size smaller than 100 μm and a fine particle content smaller than 0.075mmThe proportion of the sand particles is more than or equal to 75.6 percent, the proportion of the sand particles with the grain size of more than 0.075mm is less than or equal to 24.4 percent, and the main chemical components comprise: fe (Fe) 2 O 3 50-53％，Al 2 O 3 21-24%; the mineral powder is above grade S95, and the specific surface area is 400-450m 2 /kg; the fly ash is I-grade or II-grade fly ash.
In the scheme, the pressing step adopts a step-by-step vibration pressing process, the set pressure is 270-320kN, and the pressure maintaining time is more than 15 min.
In the above scheme, the step-by-step vibration pressing process adopts a three-step pressing process, and the specific steps include: vibrating on a vibrating table with the frequency of 2860-3000 times/min and the amplitude of 0.3-0.6 mm; firstly, pressurizing to 170-220kN, and maintaining the pressure for 5-10min; then pressurizing to 220-270kN, and maintaining the pressure for 5-10min; continuously pressurizing to 270-320kN, and maintaining the pressure for 5-10min. In the scheme, the pressurizing step adopts a stress speed of 0.330-0.410 MPa/s.
In the above scheme, the modified gamma-C 2 The preparation method of the S phosphogypsum baking-free lightweight aggregate specifically comprises the following steps:
1) Phosphogypsum, gamma-C which are weighed according to the proportion 2 S, adding mineral powder, fly ash, red mud powder and sodium metaaluminate into a stirrer, uniformly mixing, and then adding water and uniformly stirring to obtain a mixed raw material;
2) Filling the obtained mixed raw materials into a die for step-by-step vibration pressing to obtain a block-shaped green body;
3) Crushing the block-shaped green body by adopting a crusher to form aggregate coarse materials; then rounding treatment is carried out to remove the edges and corners on the aggregate surface; sieving to obtain aggregate coarse blanks with different particle sizes;
4) The obtained aggregate coarse embryo is placed into saturated lime water-graphene cement slurry for curing, and the gamma-C is obtained 2 S phosphogypsum baking-free ceramsite lightweight aggregate.
The crushing granularity of the step 3) is 5.5-10mm.
In the above scheme, the inclination angle of the rounding device adopted in the rounding step in the step 3) is 48-65 degrees.
In the scheme, the particle size of the rounded granules obtained in the step 3) is 4.5-9.5mm, and then the obtained granules are subjected to screening classification and classified maintenance.
Further, the size of the aggregate coarse embryo after the screening and grading in the step 3) is 4.5-9.5mm.
In the above scheme, the modified gamma-C 2 The particle size of the S phosphogypsum baking-free lightweight aggregate is 4.5-9.5mm.
In the scheme, the water reducer is a polycarboxylic acid high-performance water reducer, the water reducing rate is more than or equal to 35%, the solid content is 20-25%, the air content is less than or equal to 6.0%, and the chloride ion content is less than or equal to 6.0%.
In the scheme, the defoaming agent is polyether powder defoaming agent.
In the scheme, the cement is ordinary Portland cement with the strength grade of 52.5 or more.
In the scheme, the fly ash is I-grade or II-grade fly ash, wherein the CaO content is more than 10%.
In the above scheme, the silica fume is SiO 2 Gray powder with mass fraction more than or equal to 90% and specific surface area of 18000-22000m 2 /kg; the particle size of the floating beads is 10-300 mu m.
In the scheme, the nominal length of the copper plated steel fiber is 8-16mm, the equivalent diameter is 0.18-0.32mm, the yield strength is more than or equal to 2000MPa, the breaking strength is more than or equal to 3000MPa, and the elastic modulus is 200-220GPa.
In the scheme, the medium sand and the fine sand are machine-made sand or quartz sand, the grain size of the medium sand is 0.16-0.3mm, and the grain size of the fine sand is 0.1-0.15mm.
Further, the medium sand and fine sand are subjected to saturation treatment prior to use, wherein the adsorbed water is not accounted for in the amount of water used in the formulation.
A gamma-C of the above 2 The preparation method of S phosphogypsum lightweight aggregate ultra-high performance concrete comprises the following steps:
1) Weighing the raw materials according to the proportion, wherein the components and the content thereof comprise: 600-700kg/m of cement 3 100-150kg/m of fly ash 3 150-200kg/m of silica fume 3 Modified gamma-C 2 200-400kg/m S phosphogypsum baking-free aggregate 3 80-100kg/m copper plated steel fiber 3 300-700kg/m of medium sand 3 Floating beads 40-92kg/m 3 260-608kg/m of fine sand 3 8-15kg/m water reducer 3 0.5-2kg/m of defoaming agent 3 150-190kg/m of water 3 ；
2) Soaking the middle sand and fine sand in water until the sand is saturated with water to obtain premoistened sand, and adding the premoistened sand and modified gamma-C 2 S phosphogypsum baking-free aggregate, cement and silica fume are added into a concrete mixer to be premixed uniformly, fly ash and floating beads are added to be continuously and dry-mixed uniformly, water and a water reducing agent are poured into the mixer to be stirred uniformly, copper-plated steel fibers are added to be stirred uniformly, and finally a defoaming agent is added to be stirred uniformly;
3) After die filling, vibrating and forming, covering the surface with a waterproof film, performing film curing, removing the die, and performing standard curing or steam curing to obtain the gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete.
In the scheme, the constant temperature curing temperature adopted by the steam curing is 40-90 ℃ and the time is 48-72h.
gamma-C prepared according to the above scheme 2 S phosphogypsum light aggregate ultra-high performance concrete with apparent density of 2100-2350kg/m 3 The 28d compressive strength is above 110MPa, the 28d tensile strength is 6-12MPa, the 28d flexural strength is 15-25MPa, the expansion degree is 650-750mm, and the 56d drying shrinkage rate is less than 300 multiplied by 10 -6 The diffusion coefficient of chloride ion is 0.03-0.05X10 -12 m 2 And/s, the impermeability grade is > P20.
The principle of the invention is as follows:
1) The invention uses phosphogypsum and gamma-C 2 S is taken as a main raw material, industrial wastes such as phosphogypsum, fly ash, mineral powder, red mud and the like are taken as auxiliary materials to prepare baking-free ceramsite aggregate, and SO in the phosphogypsum is consumed under the strong alkaline condition provided by the red mud 4 2- And providing a weakly alkaline environment; under the weak alkaline condition, the activities of mineral powder and fly ash are activated to match Ca in phosphogypsum 2+ The reaction is carried out to generate a large number of ettringite crystals which are coated on the surface of the aggregate, so that the micro gaps in phosphogypsum aggregate can be filled, and the structure of the phosphogypsum aggregate is more compact; however, phosphogypsum aggregate still has the problems of softening when meeting water, low strength and the like; the invention further combines the curing process of saturated lime water-graphene cement paste, and combinesSaturated lime water condition promotes gamma-C 2 S further carries out carbonization reaction to generate a layer of compact silica gel phase substance which is not easy to dissolve in water, calcite, aragonite, vaterite and other substances, and forms a layer of waterproof film on the surface of aggregate, so that the problems of high water absorption rate, softening in water and the like can be effectively solved, and the strength after hardening is obviously improved.
In addition, calcium carbonate crystals, ettringite, etc. may be present in the non-carbonized gamma-C 2 S and phosphogypsum form a framework, a silica gel phase fills the framework gap and simultaneously wraps non-carbonized gamma-C 2 S and phosphogypsum surface, so that the mechanical property, water stability, durability and the like of the obtained aggregate are further effectively improved; synchronous curing and coating modification means of the graphene cement slurry on the baking-free ceramsite aggregate can obviously strengthen the interface transition region of the lightweight aggregate, and can compensate gamma-C to a certain extent 2 S phosphogypsum baking-free ceramsite lightweight aggregate has the defects of remarkably improving the strength and the like, and promoting the efficient application of the S phosphogypsum baking-free ceramsite lightweight aggregate in the fields of ultra-high-performance concrete and the like;
2) Modified gamma-C obtained by the invention 2 The S phosphogypsum baking-free aggregate part is used for preparing the ultra-high performance concrete in a mode of replacing fine sand, so that the dead weight of the concrete is further reduced, the ball lubrication function can be achieved in the ultra-high performance concrete slurry, the fluidity of the slurry is improved, more gaps are filled, the compactness of the slurry is better, and the water storage and release functions of the slurry can be achieved, so that the fluidity of the slurry can be improved more effectively, and good internal maintenance performance and the like can be achieved.
Compared with the prior art, the invention has the beneficial effects that:
1) The invention takes phosphogypsum as main raw material and utilizes gamma-C 2 S and phosphogypsum cooperate, and industrial wastes such as fly ash, mineral powder, red mud and the like are used for preparing baking-free ceramsite aggregates, and a saturated lime water-graphene cement slurry curing process is further combined, so that the strength of phosphogypsum-based aggregates can be remarkably improved on the premise of reducing dead weight, the pore structure of the phosphogypsum-based aggregates is optimized, good water absorption rate, water stability and the like are considered, and the high added value recycling of the industrial wastes such as phosphogypsum and the like can be realized;
2) Modified gamma-C 2 S phosphogypsum baking-freeThe water absorption and storage properties of the aggregate can generate a slow release effect, which is beneficial to promoting the hydration reaction of cement clinker, generating more C-S-H gel and filling the pores of a matrix, thereby reducing the porosity and pore diameter of UHPC and ensuring that the internal structure is more compact;
3) The floating beads are adopted to replace part of fine sand as light aggregate, and the optimal design method of the closest packing of the multi-element powder is utilized to further reduce the density of concrete, so that the floating beads are beneficial to promoting the efficient application in the fields of structural engineering and the like with higher requirements on structural dead weight, such as bridges, ocean engineering and the like.
Detailed Description
The invention will be further explained with reference to examples. The examples are given for illustrative purposes only and are not intended to limit the scope of the present invention.
In the following examples, the cement used was PO52.5 Portland cement; the fly ash is class I fly ash, wherein the CaO content is 20%; siO in silica fume 2 Content 94wt%, specific surface area 22000m 2 The method comprises the steps of carrying out a first treatment on the surface of the The particle size of the floating beads is 10-300 mu m; the water reducer is a polycarboxylic acid high-performance powdery water reducer, and the water reducing rate is 36%; the defoamer was white powdery polyether defoamer P803 supplied by Ming Ling chemistry.
The nominal length of the adopted copper plated steel fiber is 8-16mm, the equivalent diameter is 0.18-0.32mm, the yield strength is more than or equal to 2000MPa, the breaking strength is more than or equal to 3000MPa, and the elastic modulus is 200-220GPa.
Adopts the medium sand and the fine sand as quartz sand, the grain size of the medium sand ranges from 0.16 mm to 0.3mm, and the grain size of the fine sand ranges from 0.1 mm to 0.15mm.
The preparation steps of the adopted saturated lime water-graphene cement slurry are as follows:
1) Mixing the weighed graphene (0.03%) with saturated lime water (60%) in proportion, and ultrasonically stirring for 30min to obtain graphene dispersion liquid;
2) And uniformly mixing the graphene dispersion liquid with cement (39.97%) to obtain graphene cement paste.
In the following embodiments, the step vibration pressing process adopted adopts a three-step pressing process, and the specific steps include: vibrating on a vibrating table with the frequency of 2860 times/min and the amplitude of 0.3mm;
1) Firstly, pressurizing to 170kN at a stress speed of 0.330MPa/s, and maintaining the pressure for 5min;
2) Then pressurizing to 220kN at a stress speed of 0.330MPa/s, and maintaining the pressure for 5min;
3) Continuously pressurizing to a target pressure value of 270kN at a stress speed of 0.330MPa/s, and maintaining the pressure for 10min.
The inclination angle of the rounding equipment adopted in the rounding step is 60 degrees; the particle size after rounding treatment is 4.5-9.5mm, and then the obtained granules are subjected to screening classification and classified maintenance; the size of the aggregate coarse embryo after screening classification is 4.5-9.5mm.
Example 1
Gamma-C 2 The preparation method of the S phosphogypsum lightweight aggregate ultra-high performance concrete comprises the following steps:
1) Weighing raw materials, wherein the raw materials and the content thereof are as follows: ordinary 52.5 Portland cement 650kg/m 3 100kg/m fly ash 3 150kg/m of silica fume 3 Modified gamma-C 2 S phosphogypsum baking-free lightweight aggregate 380kg/m 3 300kg/m of medium sand 3 Floating beads 50kg/m 3 333kg/m of fine sand 3 150kg/m of water 3 80kg/m copper-plated steel fiber 3 8.5kg/m water reducing agent 3 Defoaming agent 1kg/m 3 ；
Wherein, modified baking-free gamma-C 2 The preparation method of the S phosphogypsum lightweight aggregate comprises the following steps:
1-1) phosphogypsum (45%), gamma-C 2 S (22%), fly ash (10%), mineral powder (10%), sodium metaaluminate (3%), red mud powder (5%), and water (5%) are mixed, pressed and crushed to obtain gamma-C 2 S phosphogypsum-based lightweight aggregate;
1-2) subjecting the resulting gamma-C 2 S phosphogypsum-based light set is screened and placed in saturated lime water-graphene cement paste for curing for 24 hours; obtaining the modified gamma-C 2 S phosphogypsum baking-free lightweight aggregate; its bulk density is 998kg/m 3 The water absorption rate is 7.2% in 1 hour, the size of the micro communication holes is 0.01-100nm and only accounts for 36.5% of the total porosity, the particle size is 4.5-9.5mm, the barrel pressure strength is 11.2MPa, and the softening coefficient is 0.98;
the grain sizes of the adopted fine sand and the middle sand are respectively 0.1-0.15mm and 0.16-0.3mm;
2) Soaking the sand and fine sand in water to obtain pre-wet sand, and modifying gamma-C 2 S phosphogypsum baking-free lightweight aggregate, cement and silica fume are added into a concrete mixer to be premixed uniformly, fly ash and floating beads are added to be continuously and dry-mixed uniformly, water and a water reducing agent are poured into the mixer to be stirred uniformly, copper-plated steel fibers are added to be stirred uniformly, and finally a defoaming agent is added to be stirred uniformly to obtain a mixture;
3) Filling the obtained mixture into a mold, vibrating, forming, covering a waterproof film on the surface, curing the film, removing the mold, performing steam curing, setting the steam curing temperature to 90 ℃, performing steam curing for 48 hours, and performing standard curing until the age to obtain the gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete.
Testing, curing to 28d, and obtaining gamma-C 2 The compressive strength of S phosphogypsum lightweight aggregate ultra-high performance concrete is 128Mpa, the flexural strength is 17.3MPa, the tensile strength is 8.0MPa, the expansion degree is 670mm, and the apparent density is 2130kg/m 3 56d dry shrinkage of 290X 10 -6 Chloride ion diffusion coefficient 0.03X10 -12 m 2 S, barrier rating P30.
Example 2
Gamma-C 2 The preparation method of the S phosphogypsum lightweight aggregate ultra-high performance concrete comprises the following steps:
1) Weighing raw materials, wherein the raw materials and the content thereof are as follows: ordinary 52.5 Portland cement 698kg/m 3 110kg/m fly ash 3 180kg/m of silica fume 3 Modified gamma-C 2 S phosphogypsum baking-free lightweight aggregate 320kg/m 3 406kg/m of medium sand 3 Floating beads 90kg/m 3 600kg/m of fine sand 3 185kg/m of water 3 86kg/m copper-plated steel fiber 3 8.5kg/m water reducing agent 3 Defoaming agent 1kg/m 3 ；
Wherein, modified gamma-C 2 The preparation method of the S phosphogypsum baking-free lightweight aggregate is approximately the same as that of the embodiment 1, and the difference is that the raw materials and the mass percentages thereof are as follows: phosphogypsum 48%, gamma-C 2 S28%, 8% of fly ash, 6% of mineral powder, 2% of sodium metaaluminate, 3% of red mud powder and 5% of water;
the obtained gamma-C 2 S phosphogypsum-based light set is screened and placed in saturated lime water-graphene cement paste to be maintained for 24 hours, and the modified gamma-C is obtained 2 S phosphogypsum baking-free lightweight aggregate; its bulk density is 945kg/m 3 The water absorption rate is 5.0% in 1 hour, the barrel pressure intensity is 11.7MPa, the size of the micro communication holes is 0.01-100nm and only accounts for 32.5% of the total porosity, the particle size is 4.5-9.5mm, the barrel pressure intensity is 6.5MPa, and the softening coefficient is 0.97;
the grain diameters of the quartz sand fine sand and the medium sand are respectively 0.1-0.15mm and 0.16-0.3mm; the particle size of the floating beads is 10-300 mu m;
2) Soaking the middle sand and fine sand in water until the sand is saturated with water to obtain premoistened sand, and modifying the premoistened sand to obtain modified baking-free gamma-C 2 S phosphogypsum lightweight aggregate, cement and silica fume are added into a concrete mixer to be premixed uniformly, fly ash is added to be continuously and dry-mixed uniformly, water and a water reducing agent are poured into the mixer to be stirred uniformly, copper-plated steel fibers are added uniformly to be stirred uniformly, and finally a defoaming agent is added to be stirred uniformly to obtain a mixture;
3) Filling the obtained mixture into a mold, vibrating, forming, covering a waterproof film on the surface, performing film curing, removing the mold, and performing standard curing to obtain the gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete.
After testing and standard curing, the product has a compressive strength of 134MPa, a tensile strength of 8.2MPa, a flexural strength of 19.1MPa, an expansion degree of 660mm and an apparent density of 2150kg/m after 28d 3 56d dry shrinkage of 295X 10 -6 Chloride ion diffusion coefficient 0.04×10 -12 m 2 S, permeation resistance rating P30.
Example 3
Gamma-C 2 The preparation method of the S phosphogypsum lightweight aggregate ultra-high performance concrete comprises the following steps:
1) Weighing raw materials, wherein the raw materials and the content thereof are as follows: ordinary 52.5 Portland cement 700kg/m 3 150kg/m of fly ash 3 170kg/m of silica fume 3 Modified gamma-C 2 S phosphogypsum baking-free lightweight aggregate 400kg/m 3 Middle sand300kg/m 3 80kg/m of floating beads 3 453kg/m of fine sand 3 150kg/m of water 3 Copper-plated steel fiber 90kg/m 3 9.5kg/m water reducing agent 3 Defoaming agent 1.5kg/m 3 ；
Wherein, modified gamma-C 2 The preparation method of the S phosphogypsum baking-free lightweight aggregate is approximately the same as that of the embodiment 1, and the difference is that: placing the mixture into saturated lime water-graphene cement paste for curing for 18h; the obtained modified baking-free gamma-C 2 S phosphogypsum light aggregate; its bulk density is 998kg/m 3 The water absorption rate is 6.1% in 1h, the size of the micro communication holes is 0.01-100nm and only accounts for 34.7% of the total porosity, the particle size is 4.5-9.5mm, the barrel pressure strength is 11.1MPa, and the softening coefficient is 0.98;
the grain diameter of the adopted fine sand is respectively 0.1-0.15mm and 0.16-0.25mm;
2) Soaking the sand and fine sand in water to obtain pre-wet sand, and modifying the pre-wet sand to obtain modified baking-free gamma-C 2 S phosphogypsum lightweight aggregate, cement and silica fume are added into a concrete mixer to be premixed uniformly, fly ash and floating beads are added to be continuously and dry-mixed uniformly, water and a water reducing agent are poured into the mixture to be stirred uniformly, copper-plated steel fibers are added to be stirred uniformly, and finally a defoaming agent is added to be stirred uniformly to obtain a mixture;
3) Filling the obtained mixture into a mold, vibrating, forming, covering a waterproof film on the surface, curing the film, removing the mold, performing steam curing, setting the steam curing temperature to 90 ℃, performing steam curing for 72 hours, and performing standard curing until the age to obtain the gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete.
Tested and cured for 28 days to obtain gamma-C 2 The compressive strength of S phosphogypsum lightweight aggregate ultra-high performance concrete is 148Mpa, the flexural strength is 24.0Mpa, the tensile strength is 10.8Mpa, the expansion degree is 700mm, and the apparent density is 2180kg/m 3 56d drying shrinkage of 286X 10 -6 Chloride ion diffusion coefficient 0.04×10 -12 m 2 S, permeation resistance rating P30.
Comparative example 1
Gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete and preparation method thereof comprises the following steps ofThe steps are as follows:
1) Weighing raw materials, wherein the raw materials and the content thereof are as follows: ordinary 52.5 Portland cement 700kg/m 3 150kg/m of fly ash 3 170kg/m of silica fume 3 Modified gamma-C 2 S phosphogypsum baking-free lightweight aggregate 400kg/m 3 300kg/m of medium sand 3 80kg/m of floating beads 3 453kg/m of fine sand 3 150kg/m of water 3 Copper-plated steel fiber 90kg/m 3 9.5kg/m water reducing agent 3 Defoaming agent 1.5kg/m 3 ；
Wherein, modified baking-free gamma-C 2 The preparation method of the S phosphogypsum lightweight aggregate comprises the following steps:
1-1) phosphogypsum (45%), gamma-C 2 S (22%), fly ash (10%), mineral powder (10%), sodium metaaluminate (3%), red mud powder (5%), and water (5%) are mixed, pressed and crushed to obtain gamma-C 2 S phosphogypsum-based lightweight aggregate;
1-2) subjecting the resulting gamma-C 2 S phosphogypsum lightweight aggregate is screened, sprayed (water mist) and maintained for 24 hours, and the modified baking-free gamma-C is obtained 2 S phosphogypsum light aggregate; the obtained baking-free gamma-C 2 The bulk density of S phosphogypsum light aggregate is 990kg/m 3 The water absorption rate is 6.8% in 1h, the size of the micro communication holes is 0.01-100nm and only accounts for 32.5% of the total porosity, the barrel pressure strength is 3.4MPa, and the softening coefficient is 0.85;
the grain diameter of the adopted fine sand is respectively 0.1-0.15mm and 0.16-0.3mm;
2) Soaking the sand and fine sand in water to obtain pre-wet sand, and modifying the pre-wet sand to obtain modified baking-free gamma-C 2 S phosphogypsum lightweight aggregate, cement and silica fume are added into a concrete mixer to be premixed uniformly, fly ash and floating beads are added to be continuously and dry-mixed uniformly, water and a water reducing agent are poured into the mixture to be stirred uniformly, copper-plated steel fibers are added to be stirred uniformly, and finally a defoaming agent is added to be stirred uniformly to obtain a mixture;
3) Filling the obtained mixture into a mold, vibrating, forming, covering a waterproof film on the surface, curing the film, removing the mold, performing steam curing, setting the steam curing temperature to 90 ℃, performing steam curing for 72 hours, and performing standard curing until the age is reached to obtain the water-proof composite materialγ-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete.
Tested and cured for 28 days to obtain gamma-C 2 The compressive strength of S phosphogypsum lightweight aggregate ultra-high performance concrete is 93.0Mpa, the flexural strength is 12.5Mpa, the tensile strength is 6.2Mpa, the expansion degree is 660mm, and the apparent density is 2230kg/m 3 The 56d drying shrinkage is 425 multiplied by 10 -6 Chloride ion diffusion coefficient 0.06X10 -12 m 2 S, barrier rating P25.
Comparative example 2
Gamma-C 2 The preparation method of the S phosphogypsum lightweight aggregate ultra-high performance concrete comprises the following steps:
1) Weighing raw materials, wherein the raw materials and the content thereof are as follows: ordinary 52.5 Portland cement 650kg/m 3 100kg/m fly ash 3 150kg/m of silica fume 3 Modified gamma-C 2 S phosphogypsum baking-free lightweight aggregate 380kg/m 3 300kg/m of medium sand 3 Floating beads 50kg/m 3 333kg/m of fine sand 3 150kg/m of water 3 80kg/m copper-plated steel fiber 3 8.5kg/m water reducing agent 3 Defoaming agent 1kg/m 3 ；
Wherein, modified baking-free gamma-C 2 The preparation method of S phosphogypsum lightweight aggregate is approximately the same as that of example 1, except that: the components and the mass percentages thereof are as follows: phosphogypsum 43%, gamma-C 2 The proportioning requirements of S27%, fly ash 13%, mineral powder 5%, water 7% and water glass 5% (water glass replaces sodium metaaluminate and red mud powder in example 1) are that the raw materials are weighed; wherein, the modulus of the water glass is 1.5, and the main chemical components and the content thereof are Na 2 O 10wt％、SiO 2 24wt%; the bulk density of the obtained phosphogypsum lightweight aggregate reaches 1100kg/m 3 The cylinder pressure is 3.5Mpa, the softening coefficient is 0.92, the water absorption is 8.2%, the crushing value is 20.1%, the porosity is 39.1%, the size of the fine communication holes is 0.01-100nm and accounts for 36.6% of the total porosity,
the grain diameter of the adopted fine sand is respectively 0.1-0.15mm and 0.16-0.3mm;
2) Soaking the sand and fine sand in water to obtain pre-wet sandModified baking-free gamma-C 2 S phosphogypsum lightweight aggregate, cement and silica fume are added into a concrete mixer to be premixed uniformly, fly ash is added to be continuously and dry-mixed uniformly, water and a water reducing agent are poured into the mixer to be stirred uniformly, copper-plated steel fibers are added uniformly to be stirred uniformly, and finally a defoaming agent is added to be stirred uniformly to obtain a mixture;
3) Filling the obtained mixture into a mold, vibrating, forming, covering a waterproof film on the surface, curing the film, removing the mold, performing steam curing, setting the steam curing temperature to 90 ℃ and the steam curing time to 48 hours to obtain the gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete.
Testing, curing to 28d, and obtaining gamma-C 2 The compressive strength of S phosphogypsum lightweight aggregate ultra-high performance concrete is 94.0Mpa, the flexural strength is 14.1Mpa, the tensile strength is 6.8Mpa, the expansion degree is 680mm, and the apparent density is 2223kg/m 3 56d shrinkage strain of 342X 10 -6 Chloride ion diffusion coefficient 0.07×10 -12 m 2 S, barrier rating P25.
Comparative example 3
Gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete, the preparation method is approximately the same as that of the embodiment 1, except that: gamma-C 2 S phosphogypsum-based lightweight aggregate is placed in saturated lime water for curing for 24 hours; the modified gamma-C 2 The bulk density of S phosphogypsum baking-free lightweight aggregate is 963kg/m 3 The water absorption rate is 4.9% in 1 hour, the size of the micro communication holes is 0.01-100nm and accounts for 34% of the total porosity, the particle size is 4.5-9.5mm, the barrel pressure strength is 8.6MPa, and the softening coefficient is 0.95;
through testing, the obtained gamma-C 2 The compressive strength of S phosphogypsum lightweight aggregate ultra-high performance concrete is 109.0Mpa, the flexural strength is 12.2Mpa, the tensile strength is 7.1Mpa, the expansion degree is 660mm, and the apparent density is 2190kg/m 3 56d dry shrinkage of 389×10 -6 Chloride ion diffusion coefficient 0.06X10 -12 m 2 S, barrier rating P28.
Comparative example 4
Gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete, the preparation method is approximately the same as that of the embodiment 1, except that: gamma-C 2 S, setting three-stage pressing when the phosphogypsum-based lightweight aggregate is pressed step by step, and canceling vibration conditions; the modified gamma-C 2 S phosphogypsum baking-free lightweight aggregate with bulk density of 1210kg/m 3 The water absorption rate is 7.5% in 1 hour, the size of the micro communication holes is 0.01-100nm and only accounts for 33.3% of the total porosity, the particle size is 4.5-9.5mm, the barrel pressure strength is 6.6MPa, and the softening coefficient is 0.96;
through testing, the obtained gamma-C 2 The compressive strength of S phosphogypsum lightweight aggregate ultra-high performance concrete is 101.0Mpa, the flexural strength is 10.2MPa, the tensile strength is 6.8MPa, the expansion degree is 690mm, and the apparent density is 2189kg/m 3 56d drying shrinkage of 352X 10 -6 Chloride ion diffusion coefficient 0.06X10 -12 m 2 S, barrier rating P25.
The invention is not limited to the embodiments described above, but a number of modifications and adaptations can be made by a person skilled in the art without departing from the principle of the invention, which modifications and adaptations are also considered to be within the scope of the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (10)
1. Gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete is characterized by comprising the following components in percentage by weight: 600-700kg/m of cement 3 100-150kg/m of fly ash 3 150-200kg/m of silica fume 3 Modified gamma-C 2 200-400kg/m S phosphogypsum baking-free aggregate 3 80-100kg/m copper plated steel fiber 3 300-700kg/m of medium sand 3 Floating beads 40-92kg/m 3 260-608kg/m of fine sand 3 8-15kg/m water reducer 3 0.5-2kg/m of defoaming agent 3 150-190kg/m of water 3 The method comprises the steps of carrying out a first treatment on the surface of the The modified gamma-C 2 S phosphogypsum baking-free lightweight aggregate in gamma-C 2 S, phosphogypsum, fly ash, mineral powder, red mud powder, sodium metaaluminate and water are taken as main raw materials, and are mixed, pressed and crushed to obtain gamma-C 2 S phosphogypsum-based lightweight aggregate is obtained by curing with saturated lime water-graphene cement slurry.
2.gamma-C according to claim 1 2 S phosphogypsum lightweight aggregate ultra-high performance concrete is characterized in that each component in the saturated lime water-graphene cement slurry comprises the following components in percentage by mass: 0.02-0.03% of graphene, 35-45% of cement and 55-75% of saturated lime water.
3. gamma-C according to claim 1 2 S phosphogypsum lightweight aggregate ultra-high performance concrete is characterized in that the curing time of the saturated lime water-graphene cement slurry is 18-24h.
4. gamma-C according to claim 1 2 S phosphogypsum lightweight aggregate ultra-high performance concrete, which is characterized in that the gamma-C 2 The S phosphogypsum-based lightweight aggregate comprises the following raw materials in percentage by mass: phosphogypsum 43-48%, gamma-C 2 21.5-28% of S, 8-13% of fly ash, 5-10% of mineral powder, 3-5% of red mud powder, 1-3% of sodium metaaluminate and 5-7% of water.
5. gamma-C according to claim 1 2 S phosphogypsum lightweight aggregate ultra-high performance concrete is characterized in that the set pressure adopted by the pressing condition is 270-320KN, and the total pressure maintaining time is more than 15 min.
6. gamma-C according to claim 1 2 S phosphogypsum lightweight aggregate ultra-high performance concrete, which is characterized in that the modified gamma-C 2 The particle size of the S phosphogypsum baking-free lightweight aggregate is 4.5-9.5mm.
7. gamma-C according to claim 1 2 S phosphogypsum lightweight aggregate ultra-high performance concrete is characterized in that the water reducer is a polycarboxylic acid high performance water reducer, and the water reducing rate is more than or equal to 35%.
8. gamma-C according to claim 1 2 S phosphogypsum lightweight aggregate ultra-high performance concrete is characterized in that the cement is ordinary Portland cement with the strength grade of 52.5 or more; the fly ash is I-grade or II-grade fly ash,wherein the CaO content is more than 10%; siO in silica fume 2 The content of (2) is more than 90 wt%.
9. gamma-C according to claim 1 2 S phosphogypsum lightweight aggregate ultra-high performance concrete is characterized in that the medium sand and the fine sand are machine-made sand or quartz sand, the grain size of the medium sand is 0.16-0.3mm, and the grain size of the fine sand is 0.1-0.15mm; the particle size of the floating beads is 10-300 mu m.
10. The gamma-C of any one of claims 1 to 9 2 The preparation method of S phosphogypsum lightweight aggregate ultra-high performance concrete is characterized by comprising the following steps:
1) Weighing the raw materials according to the proportion, wherein the components and the content thereof comprise: 600-700kg/m of cement 3 100-150kg/m of fly ash 3 150-200kg/m of silica fume 3 Modified gamma-C 2 200-400kg/m S phosphogypsum baking-free aggregate 3 80-100kg/m copper plated steel fiber 3 300-700kg/m of medium sand 3 Floating beads 40-92kg/m 3 260-608kg/m of fine sand 3 8-15kg/m water reducer 3 0.5-2kg/m of defoaming agent 3 150-190kg/m of water 3 ；
2) Soaking the middle sand and fine sand in water until the sand is saturated with water to obtain premoistened sand, and adding the premoistened sand and modified gamma-C 2 S phosphogypsum baking-free aggregate, cement and silica fume are added into a concrete mixer to be premixed uniformly, fly ash and floating beads are added to be continuously and dry-mixed uniformly, water and a water reducing agent are poured into the mixer to be stirred uniformly, copper-plated steel fibers are added to be stirred uniformly, and finally a defoaming agent is added to be stirred uniformly;
3) After die filling, vibrating and forming, film curing, removing the die and curing to obtain the gamma-C 2 S phosphogypsum lightweight aggregate ultra-high performance concrete.
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