CN113636794A - Large-mixing-amount fly ash concrete and preparation method thereof - Google Patents
Large-mixing-amount fly ash concrete and preparation method thereof Download PDFInfo
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- CN113636794A CN113636794A CN202110934972.8A CN202110934972A CN113636794A CN 113636794 A CN113636794 A CN 113636794A CN 202110934972 A CN202110934972 A CN 202110934972A CN 113636794 A CN113636794 A CN 113636794A
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- 239000010881 fly ash Substances 0.000 title claims abstract description 61
- 239000004567 concrete Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 52
- 239000002910 solid waste Substances 0.000 claims abstract description 40
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000011574 phosphorus Substances 0.000 claims abstract description 37
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 37
- 235000019738 Limestone Nutrition 0.000 claims abstract description 36
- 239000006028 limestone Substances 0.000 claims abstract description 36
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000004568 cement Substances 0.000 claims abstract description 18
- 230000004048 modification Effects 0.000 claims abstract description 14
- 238000012986 modification Methods 0.000 claims abstract description 14
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 14
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 12
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 12
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- 239000002253 acid Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 9
- 230000003213 activating effect Effects 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- 238000001354 calcination Methods 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 15
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 13
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 13
- 239000004571 lime Substances 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 9
- 239000012634 fragment Substances 0.000 claims description 9
- AFNWOEJOULWFIS-BTJKTKAUSA-N (z)-4-hydroxy-4-oxobut-2-enoate;tris(2-hydroxyethyl)azanium Chemical compound OC(=O)\C=C/C(O)=O.OCCN(CCO)CCO AFNWOEJOULWFIS-BTJKTKAUSA-N 0.000 claims description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 6
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 6
- 229920005551 calcium lignosulfonate Polymers 0.000 claims description 6
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 6
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000004816 latex Substances 0.000 claims description 6
- 229920000126 latex Polymers 0.000 claims description 6
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 6
- 239000008188 pellet Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000004137 mechanical activation Methods 0.000 claims description 5
- 239000011325 microbead Substances 0.000 claims description 4
- 239000004005 microsphere Substances 0.000 claims description 4
- 230000009172 bursting Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000007580 dry-mixing Methods 0.000 claims description 3
- 229940104869 fluorosilicate Drugs 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 150000003017 phosphorus Chemical class 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 3
- 238000009435 building construction Methods 0.000 claims description 2
- 239000004566 building material Substances 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- 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
- C04B14/06—Quartz; Sand
- C04B14/062—Microsilica, e.g. colloïdal silica
-
- 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
- C04B18/0427—Dry 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
- C04B18/06—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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
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- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of green building materials, and discloses a high-volume fly ash concrete and a preparation method thereof, wherein the high-volume fly ash concrete is composed of 30-35 parts of fly ash, 15-20 parts of phosphorus-containing solid waste, 15-20 parts of limestone powder, 10-15 parts of cement, 10-15 parts of nano silicon dioxide, 5-8 parts of red mud, 5-8 parts of a modification reinforcing agent and 2-3 parts of a polycarboxylic acid water reducing agent in parts by mass. The invention improves the addition amount of the fly ash in the concrete and greatly reduces the material cost; meanwhile, the phosphorus-containing solid waste is added, so that the waste can be recycled; meanwhile, the concrete is added with the modification reinforcing agent, the red mud and the nano silicon dioxide to reinforce the large-doped fly ash concrete, so that the manufacturing cost of the concrete is reduced, and the corresponding construction performance and use performance can be guaranteed; the invention can improve the compressive strength of concrete by mechanically activating the fly ash.
Description
Technical Field
The invention belongs to the technical field of green building materials, and particularly relates to a large-volume fly ash concrete and a preparation method thereof.
Background
At present: the fly ash is one of industrial waste residues with large discharge capacity in China at present and is also an important admixture for concrete. The fly ash has a morphological effect, namely the fly ash contains more than 70 percent of glass beads, and has complete particle shape, smooth surface and compact texture. The form can undoubtedly play a role in reducing water, compacting and homogenizing, change the rheological property and the initial structure of the mixture and play a role in well lubricating the pumped concrete. In addition, the fly ash also has an active effect, the micro-beads and detritus with small grain size in the fly ash can be equivalent to unhydrated cement grains in a set cement, and the ultra-fine micro-beads are equivalent to active nano materials, so that the structural strength of concrete and products thereof can be obviously improved and enhanced, and the homogeneity and the compactness are improved.
The concrete plays an important role as a basic building material in the economic construction and social progress of China, and consists of cement, sand, a water reducing agent and other components, wherein the production of the concrete cementing material cement has serious environmental pollution problems due to high energy consumption, high carbon emission and dust emission. When producing cement, a large amount of non-renewable resources such as limestone, coal and the like are needed to be consumed, and the cost is relatively high. The common cement concrete has high compressive strength and high rigidity, but has the defects of easy shrinkage cracking, low breaking strength, poor toughness, small ultimate elongation and the like in the gelling and hardening process, and the defects become more obvious along with the improvement of the strength of the cement concrete. The development of novel green concrete with low cement content, no reduction of concrete performance and high durability is a main direction for the future development of high-performance concrete.
At present, the mixing amount of fly ash in concrete is generally 10-15%, when the mixing amount of fly ash is too large, fly ash particles float upwards easily to generate bleeding, the early strength of concrete is greatly reduced, and when the mixing amount is too large, the problems of slow coagulation and the like can be caused.
Through the above analysis, the problems and defects of the prior art are as follows: the addition amount of fly ash in the existing concrete is small, and the performance of the concrete is reduced and the quality of the concrete is poor due to excessive addition of fly ash.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a large-volume fly ash concrete and a preparation method thereof.
The invention is realized in such a way that the large-volume fly ash concrete is composed of 30-35 parts of fly ash, 15-20 parts of phosphorus-containing solid waste, 15-20 parts of limestone powder, 10-15 parts of cement, 10-15 parts of nano silicon dioxide, 5-8 parts of red mud, 5-8 parts of a modification reinforcing agent and 2-3 parts of a polycarboxylic acid water reducing agent according to parts by mass.
The invention also aims to provide a preparation method of the high-volume fly ash concrete, which comprises the following steps:
firstly, pretreating phosphorus-containing solid waste; performing mechanical activation treatment on the fly ash; simultaneously, pretreating the red mud;
step two, preparing active lime powder by calcining limestone; simultaneously preparing the nano silicon dioxide and the modified reinforcing agent;
weighing fly ash, phosphorus-containing solid waste, limestone powder, cement, nano silicon dioxide, red mud, a modification reinforcing agent and a polycarboxylic acid water reducing agent according to the mass parts;
step four, adding the weighed fly ash, the phosphorus-containing solid waste, the limestone powder, the cement, the nano-silica and the red mud into a stirrer, and dry-mixing for 25-30 min;
and step five, adding water and a polycarboxylic acid water reducing agent into the stirrer, and stirring for 18-20min to obtain the high-volume fly ash concrete.
Further, the pretreatment of the phosphorus-containing solid waste comprises the following steps:
firstly, dehydrating the weighed phosphorus-containing solid waste in a filter press; drying the dehydrated phosphorus-containing solid waste in a high-temperature furnace;
secondly, crushing the dried phosphorus-containing solid waste by using a grinding device to obtain phosphorus-containing solid waste powder, and soaking the obtained phosphorus-containing solid waste powder for a period of time by using ammonia water;
and finally, drying the phosphorus-containing solid waste powder soaked in the ammonia water again to obtain the pretreated phosphorus-containing solid waste.
Further, the mechanical activation treatment of the fly ash comprises: and mechanically activating the fly ash for 8-13 minutes by adopting a high-energy ball mill.
Further, the ball/material ratio of the ball mill is set to 25: 1.
Further, the pretreatment of the red mud comprises:
pressing the water-containing red mud by adopting a mould to carry out forming treatment to obtain water-containing red mud pellets; carrying out bursting treatment on the water-containing red mud pellets to obtain red mud fragments;
and drying the red mud fragments by using the burst and generated smoke to obtain dried red mud fragments.
Further, the preparation of the activated lime powder by calcining limestone includes:
sequentially crushing, cleaning and desilting the collected limestone raw ore to obtain limestone powder; heating the obtained limestone powder to 550-600 ℃ and carrying out vacuum-pumping treatment;
pressurizing the limestone powder again for vacuumizing treatment; calcining the limestone powder subjected to secondary vacuum pumping treatment to obtain high-temperature lime;
carrying out quick cold air cooling treatment on the high-temperature lime; thus obtaining limestone powder.
Further, the calcination temperature is 650-690 ℃, and the calcination time is 35-40 min.
Further, the preparation method of the modification reinforcing agent comprises the following steps:
firstly, weighing 20-25 parts of montmorillonite, 10-15 parts of microsphere powder, 3-5 parts of redispersible latex powder, 16-18 parts of fluosilicate, 15-20 parts of calcium lignosulfonate, 10-15 parts of potassium titanate whisker and 5-8 parts of triethanolamine maleate according to a proportion;
secondly, adding water, micro-bead powder and triethanolamine maleate into a mixing and stirring kettle, stirring, uniformly mixing, heating, stirring for half an hour, adding silica sol, mixing, stirring, cooling to normal temperature, adding redispersible latex powder, fluorosilicate, calcium lignosulfonate and potassium titanate whisker, and uniformly mixing;
and finally, adding the mixed material into an ultrasonic oscillator, adding montmorillonite, and performing ultrasonic dispersion while stirring.
The invention also aims to provide application of the high-volume fly ash concrete in building construction.
By combining all the technical schemes, the invention has the advantages and positive effects that: the invention improves the addition amount of the fly ash in the concrete and greatly reduces the material cost; meanwhile, the phosphorus-containing solid waste is added, so that the waste can be recycled; meanwhile, the concrete is added with the modification reinforcing agent, the red mud and the nano silicon dioxide to reinforce the large-doped fly ash concrete, so that the manufacturing cost of the concrete is reduced, and the corresponding construction performance and use performance can be guaranteed; the invention can improve the compressive strength of concrete by mechanically activating the fly ash.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
FIG. 1 is a flow chart of a method for preparing a high-volume fly ash concrete according to an embodiment of the present invention.
FIG. 2 is a flow chart of a method for pretreating phosphorus-containing solid waste according to an embodiment of the present invention.
Fig. 3 is a flow chart of a method for pretreating red mud according to an embodiment of the present invention.
Fig. 4 is a flow chart of a method for preparing activated lime powder by calcining limestone according to an embodiment of the present invention.
FIG. 5 is a flow chart of a method for preparing a modification enhancing agent according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides a large-volume fly ash concrete and a preparation method thereof, and the invention is described in detail below with reference to the accompanying drawings.
The high-volume fly ash concrete provided by the embodiment of the invention comprises, by mass, 30-35 parts of fly ash, 15-20 parts of phosphorus-containing solid waste, 15-20 parts of limestone powder, 10-15 parts of cement, 10-15 parts of nano silicon dioxide, 5-8 parts of red mud, 5-8 parts of a modification reinforcing agent and 2-3 parts of a polycarboxylic acid water reducing agent.
As shown in fig. 1, the preparation method of the high-volume fly ash concrete provided by the embodiment of the invention comprises the following steps:
s101, pretreating phosphorus-containing solid waste; performing mechanical activation treatment on the fly ash; simultaneously, pretreating the red mud;
s102, preparing active lime powder by calcining limestone; simultaneously preparing the nano silicon dioxide and the modified reinforcing agent;
s103, weighing the fly ash, the phosphorus-containing solid waste, the limestone powder, the cement, the nano-silica, the red mud, the modification reinforcing agent and the polycarboxylic acid water reducing agent according to the mass parts;
s104, adding the weighed fly ash, the phosphorus-containing solid waste, limestone powder, cement, nano silicon dioxide and red mud into a stirrer, and dry-mixing for 25-30 min;
and S105, adding water and a polycarboxylic acid water reducing agent into the stirrer, and stirring for 18-20min to obtain the high-volume fly ash concrete.
As shown in fig. 2, the pretreatment of the phosphorus-containing solid waste according to the embodiment of the present invention includes:
s201, dehydrating the weighed phosphorus-containing solid waste in a filter press; drying the dehydrated phosphorus-containing solid waste in a high-temperature furnace;
s202, crushing the dried phosphorus-containing solid waste by using a grinding device to obtain phosphorus-containing solid waste powder, and soaking the obtained phosphorus-containing solid waste powder in ammonia water for a period of time;
and S203, drying the phosphorus-containing solid waste powder soaked in the ammonia water again to obtain the pretreated phosphorus-containing solid waste.
The mechanical activation treatment of the fly ash provided by the embodiment of the invention comprises the following steps: and mechanically activating the fly ash for 8-13 minutes by adopting a high-energy ball mill.
The ball-material ratio of the ball mill provided by the embodiment of the invention is set to be 25: 1.
As shown in fig. 3, the pretreatment of red mud provided by the embodiment of the present invention includes:
s301, pressing the hydrous red mud by a mould for forming treatment to obtain hydrous red mud pellets; carrying out bursting treatment on the water-containing red mud pellets to obtain red mud fragments;
and S302, drying the red mud fragments by using the burst and generated smoke to obtain dried red mud fragments.
As shown in fig. 4, an embodiment of the present invention provides an activated lime powder prepared by calcining limestone, including:
s401, sequentially crushing, cleaning and removing mud from the collected limestone raw ore to obtain limestone powder; heating the obtained limestone powder to 550-600 ℃ and carrying out vacuum-pumping treatment;
s402, pressurizing the limestone powder again for vacuumizing treatment; calcining the limestone powder subjected to secondary vacuum pumping treatment to obtain high-temperature lime;
s403, carrying out quick cold air cooling treatment on the high-temperature lime; thus obtaining limestone powder.
The calcination temperature provided by the embodiment of the invention is 650-690 ℃, and the calcination time is 35-40 min.
As shown in fig. 5, a method for preparing a modification enhancing agent according to an embodiment of the present invention includes:
s501, weighing 20-25 parts of montmorillonite, 10-15 parts of microsphere powder, 3-5 parts of redispersible latex powder, 16-18 parts of fluosilicate, 15-20 parts of calcium lignosulfonate, 10-15 parts of potassium titanate whisker and 5-8 parts of triethanolamine maleate according to a proportion;
s502, adding water, microsphere powder and triethanolamine maleate into a mixing and stirring kettle, stirring, uniformly mixing, heating, stirring for half an hour, adding silica sol, mixing, stirring, cooling to normal temperature, adding redispersible latex powder, fluorosilicate, calcium lignosulfonate and potassium titanate whisker, and uniformly mixing;
s503, adding the mixed materials into an ultrasonic oscillator, adding montmorillonite at the same time, and performing ultrasonic dispersion while stirring.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made by those skilled in the art within the technical scope of the present invention disclosed herein, which is within the spirit and principle of the present invention, should be covered by the present invention.
Claims (10)
1. The high-volume fly ash concrete is characterized by comprising, by mass, 30-35 parts of fly ash, 15-20 parts of phosphorus-containing solid waste, 15-20 parts of limestone powder, 10-15 parts of cement, 10-15 parts of nano silicon dioxide, 5-8 parts of red mud, 5-8 parts of a modification reinforcing agent and 2-3 parts of a polycarboxylic acid water reducing agent.
2. The method for preparing the bulk fly ash concrete of claim 1, wherein the method for preparing the bulk fly ash concrete comprises the following steps:
firstly, pretreating phosphorus-containing solid waste; performing mechanical activation treatment on the fly ash; simultaneously, pretreating the red mud;
step two, preparing active lime powder by calcining limestone; simultaneously preparing the nano silicon dioxide and the modified reinforcing agent;
weighing fly ash, phosphorus-containing solid waste, limestone powder, cement, nano silicon dioxide, red mud, a modification reinforcing agent and a polycarboxylic acid water reducing agent according to the mass parts;
step four, adding the weighed fly ash, the phosphorus-containing solid waste, the limestone powder, the cement, the nano-silica and the red mud into a stirrer, and dry-mixing for 25-30 min;
and step five, adding water and a polycarboxylic acid water reducing agent into the stirrer, and stirring for 18-20min to obtain the high-volume fly ash concrete.
3. The method for preparing the heavily-doped fly ash concrete according to claim 2, wherein the pretreatment of the phosphorus-containing solid waste comprises the following steps:
firstly, dehydrating the weighed phosphorus-containing solid waste in a filter press; drying the dehydrated phosphorus-containing solid waste in a high-temperature furnace;
secondly, crushing the dried phosphorus-containing solid waste by using a grinding device to obtain phosphorus-containing solid waste powder, and soaking the obtained phosphorus-containing solid waste powder for a period of time by using ammonia water;
and finally, drying the phosphorus-containing solid waste powder soaked in the ammonia water again to obtain the pretreated phosphorus-containing solid waste.
4. The method for preparing the heavily-doped fly ash concrete according to claim 2, wherein the step of mechanically activating the fly ash comprises the following steps: and mechanically activating the fly ash for 8-13 minutes by adopting a high-energy ball mill.
5. The method for preparing a heavily-doped fly ash concrete according to claim 4, wherein the ball-to-material ratio of the ball mill is set to 25: 1.
6. The method for preparing the high-volume fly ash concrete according to claim 2, wherein the pre-treating the red mud comprises the following steps:
pressing the water-containing red mud by adopting a mould to carry out forming treatment to obtain water-containing red mud pellets; carrying out bursting treatment on the water-containing red mud pellets to obtain red mud fragments;
and drying the red mud fragments by using the burst and generated smoke to obtain dried red mud fragments.
7. The method of claim 2, wherein the step of preparing activated lime by calcining limestone comprises:
sequentially crushing, cleaning and desilting the collected limestone raw ore to obtain limestone powder; heating the obtained limestone powder to 550-600 ℃ and carrying out vacuum-pumping treatment;
pressurizing the limestone powder again for vacuumizing treatment; calcining the limestone powder subjected to secondary vacuum pumping treatment to obtain high-temperature lime;
carrying out quick cold air cooling treatment on the high-temperature lime; thus obtaining limestone powder.
8. The method for preparing the high-load fly ash concrete as claimed in claim 7, wherein the calcination temperature is 650-690 ℃ and the calcination time is 35-40 min.
9. The method for preparing the high-volume fly ash concrete according to claim 2, wherein the method for preparing the modification reinforcing agent comprises the following steps:
firstly, weighing 20-25 parts of montmorillonite, 10-15 parts of microsphere powder, 3-5 parts of redispersible latex powder, 16-18 parts of fluosilicate, 15-20 parts of calcium lignosulfonate, 10-15 parts of potassium titanate whisker and 5-8 parts of triethanolamine maleate according to a proportion;
secondly, adding water, micro-bead powder and triethanolamine maleate into a mixing and stirring kettle, stirring, uniformly mixing, heating, stirring for half an hour, adding silica sol, mixing, stirring, cooling to normal temperature, adding redispersible latex powder, fluorosilicate, calcium lignosulfonate and potassium titanate whisker, and uniformly mixing;
and finally, adding the mixed material into an ultrasonic oscillator, adding montmorillonite, and performing ultrasonic dispersion while stirring.
10. Use of the heavily-doped fly ash concrete of claim 1 in building construction.
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