CN116120011A - Green high-performance concrete doped with nano titanium dioxide and preparation method thereof - Google Patents
Green high-performance concrete doped with nano titanium dioxide and preparation method thereof Download PDFInfo
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- CN116120011A CN116120011A CN202310069404.5A CN202310069404A CN116120011A CN 116120011 A CN116120011 A CN 116120011A CN 202310069404 A CN202310069404 A CN 202310069404A CN 116120011 A CN116120011 A CN 116120011A
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- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000004574 high-performance concrete Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title description 6
- 239000004567 concrete Substances 0.000 claims abstract description 67
- 239000002245 particle Substances 0.000 claims abstract description 66
- 239000002699 waste material Substances 0.000 claims abstract description 51
- 239000000835 fiber Substances 0.000 claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000000843 powder Substances 0.000 claims abstract description 27
- 229920000728 polyester Polymers 0.000 claims abstract description 25
- 239000004575 stone Substances 0.000 claims abstract description 24
- 239000004743 Polypropylene Substances 0.000 claims abstract description 23
- -1 polypropylene Polymers 0.000 claims abstract description 23
- 229920001155 polypropylene Polymers 0.000 claims abstract description 23
- 239000002893 slag Substances 0.000 claims abstract description 23
- 241000238424 Crustacea Species 0.000 claims abstract description 21
- 239000004568 cement Substances 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000004576 sand Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 15
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 239000004408 titanium dioxide Substances 0.000 claims description 7
- 239000004745 nonwoven fabric Substances 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 241000238557 Decapoda Species 0.000 claims description 2
- 241000237509 Patinopecten sp. Species 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 235000020637 scallop Nutrition 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 10
- 238000012360 testing method Methods 0.000 description 17
- 238000002474 experimental method Methods 0.000 description 11
- 238000007710 freezing Methods 0.000 description 8
- 230000008014 freezing Effects 0.000 description 7
- 239000002086 nanomaterial Substances 0.000 description 6
- 238000010257 thawing Methods 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 239000010438 granite Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 241000238565 lobster Species 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 108010053481 Antifreeze Proteins Proteins 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 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
- 230000002411 adverse Effects 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000010454 slate Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B14/30—Oxides other than silica
- C04B14/305—Titanium oxide, e.g. titanates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
-
- 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 green high-performance concrete doped with nano titanium dioxide, which is prepared from the following raw materials in parts by weight: 340-390 parts of cement; 0-75 parts of ground slag; 30-55 parts of crustacean exoskeleton powder; 900-1000 parts of recycled coarse aggregate; 600-700 parts of fine aggregate; 1.5-6.5 parts of nano titanium dioxide; 30-55 parts of micro aggregate; 10-15 parts of water reducer; 140-165 parts of water; the particle size of the recycled coarse aggregate is 5-15mm, and the recycled coarse aggregate is one or two selected from waste concrete and waste stone leftover materials; the fine aggregate is river sand, desalted sea sand or waste stone chips; the micro aggregate comprises polyester fiber and polypropylene fiber, and the mass ratio of the polyester fiber to the polypropylene fiber is 0.5-1.5:1. The concrete provided by the invention has the advantages of green and environment-friendly properties, and can ensure excellent properties such as high mechanical properties, high durability, high corrosion resistance and the like.
Description
Technical Field
The invention relates to the technical field of concrete materials, in particular to a green high-performance concrete doped with nano titanium dioxide and a preparation method thereof.
Background
In the current world with rapid economic development, the process of urban construction is continuously accelerated, the scale of foundation construction is continuously enlarged, a large amount of construction wastes are generated by dismantling old buildings, and a series of problems of environmental pollution and resource waste are caused. In order to alleviate this contradiction, the application of green recycled concrete is increasingly studied. The recycled concrete is also called green recycled concrete, and is prepared by partially or completely replacing natural aggregates such as sand stone and the like with recycled aggregates, wherein the recycled aggregates are aggregates formed by crushing, clearing and sieving waste concrete blocks. However, the waste concrete blocks are subjected to larger mechanical external force in the crushing process, so that the surface is rough, the water absorption rate is large, the fluidity of the recycled concrete is reduced during stirring and manufacturing, the internal gaps are increased, and the performances such as corrosion resistance, compressive strength and the like are influenced after curing and molding. Therefore, it is necessary to prepare a concrete which is green and environment-friendly and ensures high performance.
Disclosure of Invention
The invention aims to solve the problems and provide the environment-friendly high-performance concrete.
In order to achieve the purpose, the invention adopts the following technical scheme:
the green high-performance concrete doped with nano titanium dioxide is prepared from the following raw materials in parts by weight: 340-390 parts of cement; 0-75 parts of ground slag; 30-55 parts of crustacean exoskeleton powder; 900-1000 parts of recycled coarse aggregate; 600-700 parts of fine aggregate; 1.5-6.5 parts of nano titanium dioxide; 30-55 parts of micro aggregate; 10-15 parts of water reducer; 140-165 parts of water;
the particle size of the recycled coarse aggregate is 5-15mm, and the recycled coarse aggregate is one or two selected from waste concrete and waste stone leftover materials; the fine aggregate is river sand, desalted sea sand or waste stone chips;
the micro aggregate comprises polyester fibers and polypropylene fibers, wherein the average diameter of the polyester fibers is 28-48 micrometers, the average length of the polyester fibers is 9-15mm, and the average diameter of the polypropylene fibers is 11-16 micrometers, and the average length of the polypropylene fibers is 3-6mm; the mass ratio of the polyester fiber to the polypropylene fiber is 0.5-1.5:1.
In the technical scheme, the exoskeleton of the crustacean comprises shells, crab shells and shrimp shells; the shell comprises oyster shell, spiral shell, scallop shell and clam shell; the crustacean exoskeleton powder is a micron-sized powder, preferably with a particle size of 0.1-0.5 microns.
Preferably, the green high-performance concrete is prepared from the following raw materials in parts by weight:
340-390 parts of cement; 50-75 parts of ground slag; 30-55 parts of crustacean exoskeleton powder; 900-1000 parts of recycled coarse aggregate; 600-700 parts of fine aggregate; 1.5-6.5 parts of nano titanium dioxide; 30-55 parts of micro aggregate; 10-15 parts of water reducer; 140-165 parts of water;
preferably, the fine slag is in the micron order, preferably having a particle size of 30 to 60 microns;
preferably the cement is Portland cement;
preferably, the water reducer is a polycarboxylic acid high-performance water reducer.
Preferably, the green high-performance concrete is prepared from the following raw materials in parts by weight:
340-380 parts of cement; 55-75 parts of ground slag; 35-55 parts of crustacean exoskeleton powder; 900-980 parts of recycled coarse aggregate; 620-700 parts of fine aggregate; 2.5-6.5 parts of nano titanium dioxide; 35-55 parts of micro aggregate; 10-14 parts of water reducer; 145-165 parts of water.
Preferably, the green high-performance concrete of any one of the above, wherein the recycled coarse aggregate is formed by mixing large-particle coarse aggregate and small-particle aggregate, the particle size of the large-particle coarse aggregate is 10-15mm, and the particle size of the small-particle aggregate is 5-10mm;
preferably, the mass ratio of the small-particle aggregate to the large-particle coarse aggregate is 1.5-2.5:1;
preferably, the large-particle coarse aggregate is obtained by crushing waste concrete, and the small-particle aggregate is obtained by crushing waste stone scraps.
Preferably, the fine aggregate is a recycled fine aggregate obtained by crushing waste stone chips into particles having a particle diameter of 0.2 to 0.9 mm.
Preferably, the average particle diameter of the nano titanium dioxide is 10-40nm, and the nano titanium dioxide is preferably prepared by mixing titanium dioxide powder with the average particle diameters of 10nm, 20nm, 30nm and 40nm according to equal mass.
Preferably, the micro aggregate is a regenerated micro aggregate, wherein the polyester fiber is a polyester fiber obtained by extracting crushed waste clothes, and the polypropylene fiber is a polypropylene fiber obtained by recycling and extracting from a waste non-woven fabric mask.
The invention also aims to provide a preparation method of the concrete, which comprises the steps of proportioning the raw materials according to the mass ratio, adding water, stirring uniformly, and curing to obtain the concrete.
The method comprises the following steps:
step one: weighing cement, recycled coarse aggregate and fine aggregate, pouring the cement, the recycled coarse aggregate and the fine aggregate into a stirrer, adding one third of water, and uniformly stirring to obtain a primary mixture;
step two: pouring the ground slag, the exoskeleton powder of crustaceans, the mixed nano titanium dioxide and the water reducer into the primary mixture obtained in the step one, and then adding one third of water and uniformly stirring to obtain a secondary mixture;
step three: adding one half of the micro aggregate into the secondary mixture obtained in the step two, adding one sixth of water, and uniformly stirring;
step four: and (3) adding one half of the remaining micro aggregate into the mixture obtained in the step (III), adding one sixth of water, uniformly stirring, and curing to obtain the green high-performance concrete.
The beneficial effects of the invention are as follows:
1. the invention adds the ground slag and the exoskeleton powder of crustaceans into the concrete as external admixture, and the external admixture and the exoskeleton powder cooperate to reduce the cement consumption, promote the waste utilization and improve the fluidity of the slurry, and can effectively fill the medium and large pores in the concrete, thereby improving the corrosion resistance and the durability of the green concrete.
2. The invention takes the waste concrete and/or waste stone leftover materials which are crushed, screened and removed with impurities as coarse aggregate, and further can prepare the concrete by taking the waste stone scraps as fine aggregate, thereby realizing green and environment-friendly effect and reducing the exploitation of natural stones.
3. The micro aggregate can adopt the polyester fiber obtained by crushing the waste clothes and the superfine polypropylene fiber extracted from the sterilized waste non-woven fabric mask, and the regenerated micro aggregate comprising the polyester fiber and the polypropylene fiber is added into the concrete, so that a compact grid structure can be formed in the concrete, the cracking and damage condition of the concrete under the load effect can be effectively delayed, and the splitting tensile strength of the green concrete can be greatly improved.
4. As the diameters of the micro-pores in the green concrete are different, the invention further researches that titanium dioxide with different particle diameters is added into the concrete, and compared with the method of doping nano materials with single particle diameters, the method can further fill various micro-pores in the concrete, improve the compactness of the concrete, inhibit water from entering the concrete, and remarkably improve the compressive strength and the freezing resistance of the green concrete.
Detailed Description
The invention is further illustrated, but is not limited, by the following examples.
The experimental methods in the following examples are conventional methods unless otherwise specified; the materials used, unless otherwise specified, are all conventional in the art and are commercially available.
Example 1
The main raw materials adopted in the embodiment of the invention are as follows:
the cement adopts P.O52.5R national standard Portland cement, the content of sulfur trioxide is less than or equal to 3.5 percent, the content of magnesium oxide is less than or equal to 5.0 percent, the loss on ignition is 1.8 percent, the initial setting time is 115 minutes, and the final setting time is 184 minutes.
The fine slag adopts commercial blast furnace water quenching fine slag which accords with national standard, the slag is derived from slag discharged from a blast furnace when ironmaking in a steel plant, water is sprayed and rapidly cooled into granular slag, and thenDrying and grinding to obtain ground slag powder; the main chemical component of the ground slag is SiO 2 、Al 2 O 3 CaO (more than 90 percent), the ignition loss is less than or equal to 1.0 percent, and the specific surface area is more than or equal to 4000cm 2 /g, particle size 43. Mu.m.
The exoskeleton powder of crustaceans is prepared from waste shell, crab shell or lobster shell by cleaning and sterilizing, mechanically grinding into fine powder with particle size of about 0.1-0.5 μm, and adding into concrete as external additive.
The grain size of the recycled coarse aggregate is 5-15mm, and the raw materials are selected from waste concrete and waste stone leftover materials. The waste stone leftover is the leftover of the natural stone after exploitation and processing, the natural stone comprises sandstone, slate, marble, granite, limestone and the like, and the waste granite leftover is used in the embodiment. Waste concrete refers to construction waste which does not contain clinker (such as bricks, ceramic tiles and the like), such as waste concrete slabs, concrete beams, concrete columns and the like, and other materials such as reinforcing steel bars, timber and the like in the waste concrete need to be removed for use.
The fine aggregate is recycled fine aggregate, which is formed by crushing waste stone scraps into particles with the particle size of 0.2-0.9mm, and then sieving and removing impurities; the waste stone dust is a byproduct generated in the stone quarry during the process of processing broken stone, and the main chemical component in the stone dust is silicon dioxide (SiO 2 ) Calcium oxide (CaO), aluminum oxide (Al) 2 O 3 ) And iron oxide (Fe) 2 O 3 ) Etc.
The particle size of the nano titanium dioxide is 10-40nm.
The micro aggregate adopts mixed regenerated micro aggregate, is formed by mixing polyester fiber extracted from crushed waste clothes and superfine polypropylene fiber extracted from sterilized waste non-woven fabric mask according to a proportion, and the polyester fiber regenerated by the waste clothes and the polypropylene fiber regenerated by the waste non-woven fabric mask can be obtained from commercial market or can be recycled by self: and (3) screening polyester fiber fabric from the recovered waste clothes, removing metal strip nose clips in the waste mask, and respectively carrying out rinsing disinfection, drying, melting, spinning and cooling shaping to obtain regenerated polyester fibers and polypropylene fibers. The average diameter of the polyester fiber is 28-48 micrometers, the average length is 9-15mm, and the average diameter of the polypropylene fiber is 11-16 micrometers, and the average length is 3-6mm.
The water reducer is a polycarboxylic acid high-performance water reducer, and the water reducing rate is 20%.
The water is common tap water.
The preparation method of the green high-performance concrete comprises the following steps:
step one: weighing cement, recycled coarse aggregate and recycled fine aggregate, pouring the cement, the recycled coarse aggregate and the recycled fine aggregate into a stirrer, and adding one third of water to stir for 3-5min to obtain a primary mixture;
step two: pouring the ground slag, oyster shell powder, mixed nano titanium dioxide and water reducer into the primary mixture obtained in the step one, and adding one third of water and stirring for 8-10min to obtain a secondary mixture;
step three: adding one half of the mixed regenerated micro aggregate into the secondary mixture obtained in the step II, adding one sixth of water, and stirring for 4-6min;
step four: adding the rest half of the mixed regenerated micro aggregate into the mixture obtained in the step three, adding the rest sixth of water, and stirring for 5-7min; and curing under standard conditions to obtain the green high-performance concrete.
Concrete materials of experimental groups 1 to 15 in table 1 were prepared by the above method, and specific formulations of each experimental group are shown in table 1 (the numerical value in table 1 is weight part):
TABLE 1
The specific information of the raw materials of each experimental group is as follows:
experiment group 1: the nanometer titanium dioxide is formed by mixing titanium dioxide with average particle diameters of 10nm, 20nm, 30nm and 40nm according to equal mass ratio, and the micro aggregate is formed by mixing regenerated polyester fiber and polypropylene fiber according to mass ratio of 1:1; the recycled coarse aggregate is prepared by crushing waste concrete into particles with the particle size of 5-10mm in a crusher and crushing waste stone leftover materials into particles with the particle size of 10-15mm, removing impurities from the particles and mixing the particles according to the mass ratio of 2:1; the exoskeletons of crustacean are oyster shell powder.
Experiment group 2: the micro aggregate is formed by mixing regenerated polyester fibers and polypropylene fibers according to the mass ratio of 0.5:1, and the exoskeleton powder of crustaceans adopts crab shells. The remainder is the same as experimental group 1.
Experiment group 3: the micro aggregate is formed by mixing recycled polyester fibers and polypropylene fibers according to the mass ratio of 1.5:1, the recycled coarse aggregate is obtained by crushing waste granite leftover materials into particles with the particle size of 5-10mm, and the exoskeletal powder of crustaceans adopts lobster shells. The remainder is the same as experimental group 1.
Experimental group 4-experimental group 9: as in experimental group 1.
Experimental group 10 differs from example 1 in that: the recycled coarse aggregate is prepared by mixing particles with the particle size of 5-10mm and particles with the particle size of 10-15mm in a ratio of 1:2 after removing impurities; the remainder was the same as in example 1.
Experimental group 11 differs from example 1 in that: the nano titanium dioxide is prepared by mixing titanium dioxide with average particle diameters of 20nm, 30nm and 40nm according to equal mass; the remainder was the same as in example 1.
Experimental group 12 differs from example 1 in that: the nano titanium dioxide is formed by mixing titanium dioxide with the average particle size of 10nm and 40nm according to equal mass; the remainder was the same as in example 1.
Experimental group 13 differs from example 1 in that: only the nano material with the particle size of 40nm is reserved in the nano titanium dioxide; the recycled coarse aggregate is obtained by crushing waste concrete into particles with the particle size of 10-15mm in a crusher; the remainder was the same as in example 1.
Experimental group 14 differs from example 1 in that: removing polyester fibers from the mixed regenerated micro aggregate, and only adopting polypropylene fibers; the remainder was the same as in example 1.
Experimental group 15 differs from example 1 in that: mixing the third step and the fourth step in the preparation method without adding mixed regenerated micro aggregate, adding the rest one third of water into the secondary mixture obtained in the second step, stirring for 9-13min, and curing under standard conditions; the remainder was the same as in example 1.
Performance testing of the concrete materials of table 1:
split tensile and compressive strength: making a standard test block according to GB/T50081-2002 standard of a common concrete mechanical property test method, and measuring the split tensile strength and the compression strength of the standard test block for 28 days;
anti-freeze performance test: and (3) manufacturing a standard test block by referring to GB/T50082-2009 Standard of method for testing the long-term performance and the durability of common concrete, testing by adopting a quick freezing method, and evaluating the anti-freezing performance by the maximum freezing and thawing times which can be born by a concrete test piece.
Testing corrosion resistance: and (3) manufacturing a standard test block by referring to GB/T50082-2009 Standard of method for testing the long-term performance and the durability of common concrete, and evaluating the corrosion resistance by adopting a sulfate erosion test and the maximum number of dry and wet cycles which can be born by a concrete test piece.
The test results are shown in Table 2:
TABLE 2
The test results in table 2 show that the 28d compressive strength, the 28d split tensile strength, the maximum freeze thawing cycle number and the maximum dry and wet cycle number of the green high-performance concrete doped with nano titanium dioxide in the test groups 1 to 6 are all superior to the corresponding performances in the test groups 7 to 15, wherein the maximum 28d compressive strength in the test group 5 is 60.3MPa, the maximum 28d split tensile strength is 6.1MPa, the maximum freeze thawing cycle number is 337 and the maximum dry and wet cycle number is 139. The green high-performance concrete doped with nano titanium dioxide prepared by the method has excellent mechanical property, freezing resistance and corrosion resistance.
In the experiment group 7, no fine slag is added, and compared with the experiment group 1, the workability is reduced when the concrete is mixed, the number of internal pores is increased after curing and molding, and the mechanical property and durability are reduced; in the experiment group 8, exoskeleton powder of crustacean is not added, the fluidity of green concrete in the initial stirring stage is reduced, the cement hydration reaction is insufficient, and the compression resistance, the split tensile strength and the frost resistance are poor after 28d curing compared with the experiment group 1; the experimental group 9 changes the ground slag and the exoskeleton powder of crustaceans into class I fly ash, and compared with the experimental group 1, the strength, the frost resistance and the corrosion resistance are greatly attenuated, which shows that the effect of the ground slag and the exoskeleton powder of crustaceans as mineral external admixture for improving the green concrete performance is obviously improved compared with the fly ash; after the proportion of the particles with the particle size of 10-15mm in the coarse aggregate is increased in the experimental group 10, the number of macropores in the concrete is increased, the compactness is reduced, and compared with the experimental group 1, the strength, the maximum freeze thawing times and the maximum dry and wet cycle times are obviously reduced.
The particle size of the mixed nano titanium dioxide in the experimental group 11 is changed into 3 types, the particle size of the nano titanium dioxide in the experimental group 12 is changed into 2 types, and compared with the experimental group 1, the 28d compressive strength, the 28d splitting tensile strength, the maximum freeze thawing cycle number and the maximum dry wetting cycle number of the nano material with one particle size in the experimental group 13 are reduced, so that the micro pores with different sizes in the nano material can be filled to the greatest extent only by mixing the nano materials with 4 particle sizes into the concrete, the compactness of the nano material is fully improved, moisture is prevented from entering the concrete, and the mechanical property and the freezing resistance of the green concrete are obviously improved; the polyester fiber is not added in the experiment group 14, and compared with the experiment group 1, the tensile effect of single fiber on the internal structure of green concrete is reduced, and the split tensile strength of the concrete is poor; in the experiment group 15, the mixed regenerated micro aggregate is completely removed, the strength and the frost resistance of the green concrete are obviously reduced, and the fact that the green concrete is added after the waste clothes and the fibers extracted from the mask are mixed is indicated that the development and the change of cracks under the action of external adverse environments can be effectively delayed, and the splitting tensile strength and the frost resistance of the green concrete are improved.
Compared with other experimental groups, the 28d split tensile strength, the maximum freeze thawing cycle number and the maximum dry and wet cycle number of the concrete prepared by the experimental groups 8, 9, 14 and 15 are lower than those of the concrete prepared by the other experimental groups, so that the problems of freezing resistance, cracking resistance and corrosion resistance of the concrete cannot be solved better, and the concrete is not suitable for being applied to practical engineering; the concrete of the rest experimental groups has excellent freezing resistance, cracking resistance and corrosion resistance, and the concrete has the advantages of green and environment protection and can ensure excellent performances such as high mechanical property, high durability and high corrosion resistance.
Claims (10)
1. The green high-performance concrete doped with nano titanium dioxide is characterized by being prepared from the following raw materials in parts by weight:
340-390 parts of cement; 0-75 parts of ground slag; 30-55 parts of crustacean exoskeleton powder; 900-1000 parts of recycled coarse aggregate; 600-700 parts of fine aggregate; 1.5-6.5 parts of nano titanium dioxide; 30-55 parts of micro aggregate; 10-15 parts of water reducer; 140-165 parts of water;
the particle size of the recycled coarse aggregate is 5-15mm, and the recycled coarse aggregate is one or two selected from waste concrete and waste stone leftover materials; the fine aggregate is river sand, desalted sea sand or waste stone chips;
the micro aggregate comprises polyester fibers and polypropylene fibers, wherein the average diameter of the polyester fibers is 28-48 micrometers, the average length of the polyester fibers is 9-15mm, and the average diameter of the polypropylene fibers is 11-16 micrometers, and the average length of the polypropylene fibers is 3-6mm; the mass ratio of the polyester fiber to the polypropylene fiber is 0.5-1.5:1.
2. The green high performance concrete of claim 1, wherein the crustacean exoskeleton comprises shells, crab shells, shrimp shells; the shell comprises oyster shell, spiral shell, scallop shell and clam shell; the crustacean exoskeleton powder is a micron-sized powder, preferably with a particle size of 0.1-0.5 microns.
3. The green high-performance concrete according to claim 1, which is prepared from the following raw materials in parts by weight:
340-390 parts of cement; 50-75 parts of ground slag; 30-55 parts of crustacean exoskeleton powder; 900-1000 parts of recycled coarse aggregate; 600-700 parts of fine aggregate; 1.5-6.5 parts of nano titanium dioxide; 30-55 parts of micro aggregate; 10-15 parts of water reducer; 140-165 parts of water;
preferably, the fine slag is in the micron order, preferably having a particle size of 30 to 60 microns;
preferably the cement is Portland cement;
preferably, the water reducer is a polycarboxylic acid high-performance water reducer.
4. The green high-performance concrete according to claim 3, which is prepared from the following raw materials in parts by weight:
340-380 parts of cement; 55-75 parts of ground slag; 35-55 parts of crustacean exoskeleton powder; 900-980 parts of recycled coarse aggregate; 620-700 parts of fine aggregate; 2.5-6.5 parts of nano titanium dioxide; 35-55 parts of micro aggregate; 10-14 parts of water reducer; 145-165 parts of water.
5. The green high performance concrete according to any one of claims 1 to 4, wherein: the regenerated coarse aggregate is formed by mixing large-particle coarse aggregate and small-particle aggregate, the particle size of the large-particle coarse aggregate is 10-15mm, and the particle size of the small-particle aggregate is 5-10mm;
preferably, the mass ratio of the small-particle aggregate to the large-particle coarse aggregate is 1.5-2.5:1;
preferably, the large-particle coarse aggregate is obtained by crushing waste concrete, and the small-particle aggregate is obtained by crushing waste stone scraps.
6. The green high performance concrete according to any one of claims 1 to 4, wherein: the fine aggregate is a regenerated fine aggregate obtained by crushing waste stone chips into particles with the particle size of 0.2-0.9 mm.
7. The green high performance concrete according to any one of claims 1 to 4, wherein: the average particle diameter of the nano titanium dioxide is 10-40nm, and the nano titanium dioxide is preferably prepared by mixing titanium dioxide powder with the average particle diameters of 10nm, 20nm, 30nm and 40nm according to equal mass.
8. The green high performance concrete according to any one of claims 1 to 4, wherein: the micro aggregate is regenerated micro aggregate, wherein the polyester fiber is obtained by crushing waste clothes and extracting, and the polypropylene fiber is obtained by recycling waste non-woven fabric mask.
9. The method for preparing the concrete according to any one of claims 1 to 8, wherein the concrete is prepared by proportioning the raw materials according to the mass ratio, adding water, stirring uniformly, and curing.
10. The method according to claim 9, comprising the steps of:
step one: weighing cement, recycled coarse aggregate and fine aggregate, pouring the cement, the recycled coarse aggregate and the fine aggregate into a stirrer, adding one third of water, and uniformly stirring to obtain a primary mixture;
step two: pouring the ground slag, the exoskeleton powder of crustaceans, the mixed nano titanium dioxide and the water reducer into the primary mixture obtained in the step one, and then adding one third of water and uniformly stirring to obtain a secondary mixture;
step three: adding one half of the micro aggregate into the secondary mixture obtained in the step two, adding one sixth of water, and uniformly stirring;
step four: and (3) adding one half of the remaining micro aggregate into the mixture obtained in the step (III), adding one sixth of water, uniformly stirring, and curing to obtain the green high-performance concrete.
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