CN118084405A - Ecological high-strength concrete and preparation method thereof - Google Patents
Ecological high-strength concrete and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 36
- 239000011372 high-strength concrete Substances 0.000 title claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 128
- 239000002243 precursor Substances 0.000 claims abstract description 124
- 239000006227 byproduct Substances 0.000 claims abstract description 123
- 239000002994 raw material Substances 0.000 claims abstract description 62
- 239000010806 kitchen waste Substances 0.000 claims abstract description 59
- 239000000463 material Substances 0.000 claims abstract description 28
- 239000004576 sand Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000003213 activating effect Effects 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000002956 ash Substances 0.000 claims description 153
- 210000003278 egg shell Anatomy 0.000 claims description 105
- 239000000243 solution Substances 0.000 claims description 90
- 241000209094 Oryza Species 0.000 claims description 66
- 235000007164 Oryza sativa Nutrition 0.000 claims description 66
- 235000009566 rice Nutrition 0.000 claims description 66
- 238000007873 sieving Methods 0.000 claims description 61
- 238000000227 grinding Methods 0.000 claims description 57
- 102000002322 Egg Proteins Human genes 0.000 claims description 53
- 108010000912 Egg Proteins Proteins 0.000 claims description 53
- 230000004913 activation Effects 0.000 claims description 50
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 44
- 239000000126 substance Substances 0.000 claims description 44
- 238000001035 drying Methods 0.000 claims description 40
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 39
- 238000003825 pressing Methods 0.000 claims description 30
- 229920001661 Chitosan Polymers 0.000 claims description 23
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 23
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 22
- 239000001488 sodium phosphate Substances 0.000 claims description 22
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 22
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 22
- 239000012266 salt solution Substances 0.000 claims description 20
- 239000012190 activator Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 13
- 239000004115 Sodium Silicate Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- 238000007580 dry-mixing Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 9
- 238000003763 carbonization Methods 0.000 claims description 8
- 239000011734 sodium Substances 0.000 claims description 8
- 238000012216 screening Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 5
- 239000010881 fly ash Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 229960001484 edetic acid Drugs 0.000 claims 3
- 239000004567 concrete Substances 0.000 abstract description 20
- 239000002910 solid waste Substances 0.000 abstract description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 37
- 238000004140 cleaning Methods 0.000 description 20
- 239000012535 impurity Substances 0.000 description 20
- 238000006243 chemical reaction Methods 0.000 description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 17
- 238000001354 calcination Methods 0.000 description 16
- 229910004298 SiO 2 Inorganic materials 0.000 description 11
- 238000012271 agricultural production Methods 0.000 description 10
- 239000003344 environmental pollutant Substances 0.000 description 10
- 231100000719 pollutant Toxicity 0.000 description 10
- 238000002791 soaking Methods 0.000 description 10
- 238000005406 washing Methods 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 239000011398 Portland cement Substances 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 235000013339 cereals Nutrition 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 229920000876 geopolymer Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000037081 physical activity Effects 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012795 verification 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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
-
- 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
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
- C04B20/02—Treatment
- C04B20/04—Heat treatment
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses ecological high-strength concrete and a preparation method thereof, and belongs to the technical field of concrete materials. The raw materials of the concrete comprise (0.2-0.4): (0.1-0.2) precursor powder, an activating agent, sand aggregate and water in a mass ratio of 1; the precursor powder comprises industrial byproduct precursor powder, agricultural byproduct precursor powder and kitchen waste byproduct precursor powder with the mass ratio of 1 (0.5-1.5) to 2.5-3.5. The ecological high-strength concrete raw material provided by the invention mainly comes from solid waste, enriches the types of raw materials for preparing the concrete material, does not need high-temperature maintenance, can reach 75.02MPa in 3 days and 94.88MPa in 28 days, and has the characteristics of low carbon, environmental friendliness, simple construction, high early strength and excellent mechanical property.
Description
Technical Field
The invention belongs to the technical field of concrete materials, and particularly relates to ecological high-strength concrete and a preparation method thereof.
Background
Along with the continuous development of social economy, the construction demands of various infrastructures in various countries in the world are also continuously increasing, and concrete structures are one of the most widely used structural forms. Meanwhile, the construction of modern concrete structures increasingly shows the characteristics of complex structural form and severe service environment, so that the mechanical properties of the concrete also show the development trend of high strength. The production of ordinary portland cement, one of the most widely used components in concrete, is also increasing, and it is expected that its annual demand will reach 3.68-4.38Gt by 2050. However, the production process of ordinary portland cement inevitably causes many environmental problems due to its unique manufacturing process, for example, the production of ordinary portland cement consumes a large amount of energy and emits a large amount of carbon dioxide, which consumes about 5% of natural resources, and carbon dioxide emissions about 5-7% of the total amount of global artificial carbon dioxide emissions. The massive emission of carbon dioxide from isothermal cells is one of the main causes of global climate change. Therefore, in order to achieve the carbon-peak carbon neutralization, it is necessary to further enrich the raw material composition in the building material field.
In order to solve the negative effects of ordinary portland cement on natural resources and environment, more and more researchers are devoted to developing environment-friendly cementing materials to replace ordinary portland cement-based cementing materials so as to prepare ecological concrete. The invention patent CN110407507A discloses a preparation method of full solid waste dry mixed mortar, which utilizes gypsum, slag, waste stone dust and construction waste to replace cement, effectively utilizes solid waste, but the compression strength of the best embodiment is only 15.6MPa in 28 days; the invention patent CN116606094A discloses a preparation method of a geopolymer mortar reinforcing material, solid wastes such as fly ash, slag powder and the like are used for replacing cement, so that the pressure of the building material field in the aspects of energy reduction and emission reduction is effectively relieved, but the 28-day compressive strength of the best embodiment is only 45.26MPa, and in addition, the cost of the internally added polyvinyl alcohol fiber is high, so that the popularization and the application of the reinforced geopolymer mortar reinforcing material in engineering practice are greatly limited.
It is therefore necessary to develop a high-strength concrete material with low carbon and environmental protection properties against the deficiencies in the prior art.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the ecological high-strength concrete and the preparation method thereof, so as to further improve the utilization rate of solid waste and promote the low-carbon and green development in the field of concrete materials.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The invention provides ecological high-strength concrete, which comprises the following raw materials in percentage by mass (1) (0.2-0.4) (0.1-0.2) of precursor powder, an activating agent, sand aggregate and water;
the precursor powder comprises industrial byproduct precursor powder, agricultural byproduct precursor powder and kitchen waste byproduct precursor powder with the mass ratio of 1 (0.5-1.5) to 2.5-3.5.
As a preferable scheme of the invention, the activating agent is obtained by mixing sodium silicate solution and sodium hydroxide solution according to the volume ratio of (1.3-1.7): 1; the sodium silicate is Na 2O·nSiO2, the n value is 3-3.3, and the mass ratio of H 2 O to Na 2O·nSiO2 in the sodium silicate solution is 7-10; the concentration of the sodium hydroxide solution is 12-16 mol/L.
As a preferable mode of the invention, the maximum grain diameter of the sand aggregate is 1mm, and the average grain diameter is 0.6-0.7 mm.
As a preferable scheme of the invention, the industrial byproduct precursor powder is fly ash, the content of SiO 2 is 52-55wt%, the content of Al 2O3 is 34-38wt%, the content of CaO is 1.9-2.2wt%, and the average particle size (d 50) is 9-10 mu m; the agricultural byproduct precursor powder is prepared by processing rice hull raw materials, wherein the content of SiO 2 is 92-98 wt%, the content of Al 2O3 is 0.12-0.45 wt%, the content of CaO is 0.17-0.57 wt%, and the average particle size is 2-4 mu m; the kitchen waste byproduct precursor powder is prepared by processing eggshell raw materials, wherein the content of SiO 2 is 31-33 wt%, the content of Al 2O3 is 16-18.5 wt%, the content of CaO is 33-35 wt% and the average particle size is 9-10 mu m.
As a preferred scheme of the invention, the preparation method of the agricultural byproduct precursor powder comprises the following steps: firstly, sequentially adopting chitosan quaternary ammonium salt solution and sodium phosphate solution to perform chemical activation treatment on rice hull ash obtained by burning rice hulls, and then performing filter pressing, drying, grinding, sieving and carbonization treatment to obtain the agricultural byproduct precursor powder.
As a preferable scheme of the invention, the concentration of the chitosan quaternary ammonium salt solution is 4.5-5.5wt%; the mass fraction of the sodium phosphate solution is 0.8-1.2 wt%; the mass ratio of the rice hull ash to the chitosan quaternary ammonium salt solution is 1 (2.5-3.5), and the mass ratio of the rice hull ash to the sodium phosphate solution is 1 (2.5-3.5); the carbonization treatment is carried out at 600-800 ℃ for 2-4 hours.
As a preferable scheme of the invention, the preparation method of the kitchen waste byproduct precursor powder comprises the following steps: firstly, crushing, grinding and screening eggshells to obtain eggshell ash; and then sequentially adopting an ethylenediamine tetraacetic acid solution and an ethanol solution to perform chemical activation treatment on the obtained eggshell ash, and performing filter pressing, drying, grinding, sieving and carbonization treatment to obtain the kitchen waste byproduct precursor powder.
As a preferable scheme of the invention, the concentration of the ethylenediamine tetraacetic acid solution is 0.08-0.12 mol/L, the concentration of the ethanol solution is 90-95 wt%, the mass ratio of the eggshell ash to the ethylenediamine tetraacetic acid solution is 1 (2-5), and the mass ratio of the eggshell ash to the ethanol solution is 1 (2-5); the carbonization treatment is carried out at 600-800 ℃ for 2-4 hours.
The invention also provides a preparation method of the ecological high-strength concrete, which comprises the following steps: weighing raw materials according to the proportion of the raw material consumption, and firstly, dry-mixing the industrial byproduct precursor powder, the agricultural byproduct precursor powder and the kitchen waste byproduct precursor powder to obtain uniformly-dispersed precursor powder; then adding sand aggregate for dry mixing to obtain a dry mixed material; finally, adding the activator and water into the dry-mixed material for continuous mixing.
As a preferable scheme of the invention, after the activator and water are added into the dry mixed material for continuous mixing, the obtained mixed material is continuously put into a test mould, maintained and demoulded, and then the mixture is moved to a standard maintenance room for maintenance, thus obtaining the ecological high-strength concrete.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention enriches the types of raw materials for preparing concrete materials, and the ecological high-strength concrete is obtained by taking industrial byproduct precursor powder, agricultural byproduct precursor powder, kitchen waste byproduct precursor powder, an activating agent, sandstone aggregate and water as raw materials and selecting the raw materials and adjusting the dosage.
(2) In the preferred technical scheme of the invention, the physical and chemical activation method is adopted by optimizing the treatment method of the agricultural byproduct precursor powder and the kitchen waste byproduct precursor powder, so that the reaction activity is fully exerted, and the mechanical property of the ecological concrete can be effectively improved.
(3) The ecological high-strength concrete raw material provided by the invention mainly comes from solid waste, high-temperature maintenance is not needed, the compression strength of the ecological high-strength concrete raw material can reach 75.02MPa in 3 days, and can reach 94.88MPa in 28 days, and the ecological high-strength concrete raw material has the characteristics of low carbon, environment friendliness, simplicity in construction, high early strength and excellent mechanical property.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of the preparation of the ecological high-strength concrete of example 1 of the present invention.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the invention described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present invention. The specification and examples of the present invention are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
The sand aggregates used in the following examples and comparative examples were fine sand having a particle size in the range of 0 to 1mm and an average particle size of 0.645mm; the industrial byproduct precursor powder used was commercial grade 1 fly ash with a SiO 2 content of 54.14wt%, an Al 2O3 content of 36.41wt%, a CaO content of 2.03wt% and an average particle size of 9.475 μm. The chitosan quaternary ammonium salt was purchased from Guangdong chemical reagent Co. The description will not be repeated below.
Example 1
The ecological high-strength concrete mixture is prepared by taking sand aggregate, an activating agent, water and precursor powder with the mass ratio of 0.3:0.3:0.14:1 as raw materials, wherein the precursor powder consists of industrial byproduct precursor powder, agricultural byproduct precursor powder and kitchen waste byproduct precursor powder with the mass ratio of 1:1:3. The method comprises the following specific steps:
step 1, preparing agricultural byproduct precursor powder, which comprises the following steps:
(1) Using rice hull ash produced by combusting rice hulls of agricultural production as a raw material, and sieving with 200 meshes to obtain ash;
(2) Washing and cleaning the prepared rice hull ash, and performing filter pressing treatment to remove impurities;
(3) Then drying at 70 ℃ and grinding and sieving to remove impurities;
(4) Soaking rice hull ash obtained in the step (3) in sequence by using a chitosan quaternary ammonium salt solution with the concentration of 5wt% and a sodium phosphate solution with the concentration of 1wt%, wherein the mass ratio of the rice hull ash to the chitosan quaternary ammonium salt solution is 1:3, and the mass ratio of the rice hull ash to the sodium phosphate solution is 1:3, and exciting ash reaction activity by a chemical activation method;
(5) Carrying out filter pressing, drying, grinding and sieving treatment on ash after chemical activation;
(6) Then calcining for 2 hours at 700 ℃ and using a physical mode to excite ash activity;
(7) And finally grinding and screening to obtain agricultural byproduct precursor powder with the average particle diameter of 2.925 mu m. Wherein the content of SiO 2 is 97.60wt%, the content of Al 2O3 is 0.37wt% and the content of CaO is 0.42wt%.
Step 2, preparing kitchen waste byproduct precursor powder, which comprises the following steps:
(1) Collecting kitchen waste byproduct eggshells as a preparation raw material;
(2) Thoroughly cleaning the collected eggshells to remove pollutants, and drying the eggshells at 70 ℃;
(3) Crushing eggshells manually, grinding the eggshells by using a ball mill, and sieving by using a screen;
(4) Sequentially soaking the obtained eggshell ash in 0.1mol/L ethylenediamine tetraacetic acid solution and 95wt% ethanol solution, wherein the mass ratio of the eggshell ash to the ethylenediamine tetraacetic acid solution is 1:4, the mass ratio of the eggshell ash to the ethanol solution is 1:4, and exciting ash reaction activity by adopting a chemical activation method;
(5) Performing filter pressing, drying, grinding and sieving treatment on the eggshell ash after chemical activation to improve the purity of the eggshell ash;
(6) Followed by calcination at 700 ℃ for 2 hours, using physical means to excite ash activity;
(7) Finally grinding and sieving to obtain kitchen waste byproduct precursor powder with an average particle size of 9.284 mu m, wherein the content of SiO 2 is 32.36wt%, the content of Al 2O3 is 17.93wt% and the content of CaO is 34.11wt%.
And 3, preparing an activating agent, wherein the steps are as follows:
(1) Preparing a sodium hydroxide solution with the concentration of 14M by using sodium hydroxide tablet powder with the purity of 99 weight percent;
(2) And (3) mixing sodium silicate solution (wherein the modulus of sodium silicate is 3.2, the contents of Na 2O、SiO2 and H 2 O in the solution are 8.35wt%, 26.54wt% and 65.11wt% respectively) with the sodium hydroxide solution prepared in the step (1) according to the mass ratio of 1.5:1, and cooling to room temperature to obtain the activator.
And 4, preparing a concrete mixture, wherein the steps are as follows:
Weighing raw materials according to the proportion of the raw material consumption, and firstly, dry-mixing the industrial byproduct precursor powder, the agricultural byproduct precursor powder and the kitchen waste byproduct precursor powder to obtain uniformly-dispersed precursor powder; then adding sand aggregate for dry mixing to obtain a dry mixed material; and finally, adding the activator and water into the dry mixed material for continuous mixing, thus obtaining the ecological high-strength concrete mixed material.
Example 2
The ecological high-strength concrete mixture is prepared by taking sand aggregate, an activating agent, water and precursor powder with the mass ratio of 0.2:0.4:0.1:1 as raw materials, wherein the precursor powder consists of industrial byproduct precursor powder, agricultural byproduct precursor powder and kitchen waste byproduct precursor powder with the mass ratio of 1:0.5:2.5. The method comprises the following specific steps:
step 1, preparing agricultural byproduct precursor powder, which comprises the following steps:
(1) Using rice hull ash produced by combusting rice hulls which are a side crop in agricultural production as a raw material, and sieving to obtain ash;
(2) Washing and cleaning the prepared rice hull ash, and performing filter pressing treatment to remove impurities;
(3) Then drying at 70 ℃ and grinding and sieving to remove impurities;
(4) Soaking rice hull ash obtained in the step (3) in a solution of chitosan quaternary ammonium salt with the concentration of 4.5wt% and a solution of sodium phosphate with the concentration of 1.2wt%, wherein the mass ratio of the rice hull ash to the solution of chitosan quaternary ammonium salt is 1:2.5, the mass ratio of the rice hull ash to the sodium phosphate solution is 1:3.5, exciting ash reaction activity through a chemical activation method;
(5) Carrying out filter pressing, drying, grinding and sieving treatment on ash after chemical activation;
(6) Then calcining for 4 hours at 600 ℃ and using a physical mode to excite ash activity;
(7) The agricultural byproduct precursor powder with the average grain diameter of 2.914 mu m is obtained through final grinding and screening treatment. Wherein the content of SiO 2 is 97.15wt%, the content of Al 2O3 is 0.41wt% and the content of CaO is 0.22wt%.
Step 2, preparing kitchen waste byproduct precursor powder, which comprises the following steps:
(1) Collecting kitchen waste byproduct eggshells as a preparation raw material;
(2) Thoroughly cleaning the collected eggshells to remove pollutants, and drying the eggshells at 70 ℃;
(3) Crushing eggshells manually, grinding the eggshells by using a ball mill, and sieving by using a screen;
(4) Sequentially treating the obtained eggshell ash with 0.08mol/L ethylenediamine tetraacetic acid solution and 90wt% ethanol solution, wherein the mass ratio of the eggshell ash to the ethylenediamine tetraacetic acid solution is 1:2, the mass ratio of the eggshell ash to the ethanol solution is 1:5, and exciting ash reaction activity by adopting a chemical activation method;
(5) Performing filter pressing, drying, grinding and sieving treatment on the eggshell ash after chemical activation to improve the purity of the eggshell ash;
(6) Followed by calcination at 800 ℃ for 2 hours, using physical means to excite ash activity;
(7) Finally grinding and sieving to obtain kitchen waste byproduct precursor powder with an average particle size of 9.358 mu m, wherein the content of SiO 2 is 31.45wt%, the content of Al 2O3 is 16.85wt% and the content of CaO is 34.58wt%.
And 3, preparing an activating agent, wherein the steps are as follows:
(1) Preparing a sodium hydroxide solution with a concentration of 12M by using sodium hydroxide flake powder with a purity of 99 wt%;
(2) And (3) mixing a sodium silicate solution consisting of 8.35% of Na 2 O,26.54% of SiO 2 and 65.11% of H 2 O (wherein the modulus of sodium silicate is 3.2, and the contents of Na 2O、SiO2 and H 2 O in the solution are 8.35wt%, 26.54wt% and 65.11wt% respectively) with the sodium hydroxide solution prepared in the step (1) according to a mass ratio of 1.3:1, and cooling to room temperature to obtain the activator.
And 4, preparing a concrete mixture, wherein the steps are as follows:
Weighing raw materials according to the proportion of the raw material consumption, and firstly, dry-mixing the industrial byproduct precursor powder, the agricultural byproduct precursor powder and the kitchen waste byproduct precursor powder to obtain uniformly-dispersed precursor powder; then adding sand aggregate for dry mixing to obtain a dry mixed material; and finally, adding the activator and water into the dry mixed material for continuous mixing, thus obtaining the ecological high-strength concrete mixed material.
Example 3
The ecological high-strength concrete mixture is prepared by taking sand aggregate, an activating agent, water and precursor powder with the mass ratio of 0.4:0.2:0.2:1 as raw materials, wherein the precursor powder consists of industrial byproduct precursor powder, agricultural byproduct precursor powder and kitchen waste byproduct precursor powder with the mass ratio of 1:1.5:3.5. The method comprises the following specific steps:
step 1, preparing agricultural byproduct precursor powder, which comprises the following steps:
(1) Using rice hull ash produced by combusting rice hulls which are a side crop in agricultural production as a raw material, and sieving to obtain ash;
(2) Washing and cleaning the prepared rice hull ash, and performing filter pressing treatment to remove impurities;
(3) Then drying at 70 ℃ and grinding and sieving to remove impurities;
(4) Sequentially treating the rice hull ash obtained in the step (3) by a chitosan quaternary ammonium salt solution with the concentration of 5.5wt% and a sodium phosphate solution with the concentration of 0.8wt%, wherein the mass ratio of the rice hull ash to the chitosan quaternary ammonium salt solution is 1:3.5, and the mass ratio of the rice hull ash to the sodium phosphate solution is 1:2.5, and exciting ash reaction activity by a chemical activation method;
(5) Carrying out filter pressing, drying, grinding and sieving treatment on ash after chemical activation;
(6) Followed by calcination at 800 ℃ for 2 hours, using physical means to excite ash activity;
(7) And finally grinding and screening to obtain agricultural byproduct precursor powder with the average particle diameter of 3.130 mu m. Wherein the content of SiO 2 is 95.15wt%, the content of Al 2O3 is 0.29wt% and the content of CaO is 0.38wt%.
Step 2, preparing kitchen waste byproduct precursor powder, which comprises the following steps:
(1) Collecting kitchen waste byproduct eggshells as a preparation raw material;
(2) Thoroughly cleaning the collected eggshells to remove pollutants, and drying the eggshells at 70 ℃;
(3) Crushing eggshells manually, grinding the eggshells by using a ball mill, and sieving by using a screen;
(4) Sequentially treating the obtained eggshell ash with 0.12mol/L ethylenediamine tetraacetic acid solution and 95wt% ethanol solution, wherein the mass ratio of the eggshell ash to the ethylenediamine tetraacetic acid solution is 1:5, the mass ratio of the eggshell ash to the ethanol solution is 1:2, and exciting ash reaction activity by adopting a chemical activation method;
(5) Performing filter pressing, drying, grinding and sieving treatment on the eggshell ash after chemical activation to improve the purity of the eggshell ash;
(6) Followed by calcination at 600 ℃ for 4 hours, using physical means to excite ash activity;
(7) Finally grinding and sieving to obtain kitchen waste byproduct precursor powder with an average particle size of 9.417 mu m, wherein the content of SiO 2 is 31.85wt%, the content of Al 2O3 is 16.98wt% and the content of CaO is 34.83wt%.
And 3, preparing an activating agent, wherein the steps are as follows:
(1) Preparing a sodium hydroxide solution with a concentration of 16M by using sodium hydroxide flake powder with a purity of 99 wt%;
(2) And (3) mixing sodium silicate solution (wherein the modulus of sodium silicate is 3.2, the contents of Na 2O、SiO2 and H 2 O in the solution are 8.35wt%, 26.54wt% and 65.11wt% respectively) with the sodium hydroxide solution prepared in the step (1) according to the mass ratio of 1.7:1, and cooling to room temperature to obtain the activator.
And 4, preparing a concrete mixture, wherein the steps are as follows:
Weighing raw materials according to the proportion of the raw material consumption, and firstly, dry-mixing the industrial byproduct precursor powder, the agricultural byproduct precursor powder and the kitchen waste byproduct precursor powder to obtain uniformly-dispersed precursor powder; then adding sand aggregate for dry mixing to obtain a dry mixed material; and finally, adding the activator and water into the dry mixed material for continuous mixing, thus obtaining the ecological high-strength concrete mixed material.
Comparative example 1
The difference from example 1 is that the chemical activity excitation and the physical activity excitation treatment are not performed in the preparation process of the agricultural byproduct precursor powder in step 1 and the kitchen waste byproduct precursor powder in step 2. The method comprises the following steps:
step 1, preparing agricultural byproduct precursor powder, which comprises the following steps:
(1) Using rice hull ash produced by combusting rice hulls which are a side crop in agricultural production as a raw material, and sieving to obtain ash;
(2) Washing and cleaning the prepared rice hull ash, and performing filter pressing treatment to remove impurities;
(3) And then drying at 70 ℃, grinding and screening to remove impurities, and obtaining the agricultural byproduct precursor powder.
Step 2, preparing kitchen waste byproduct precursor powder, which comprises the following steps:
(1) Collecting kitchen waste byproduct eggshells as a preparation raw material;
(2) Thoroughly cleaning the collected eggshells to remove pollutants, and drying the eggshells at 70 ℃;
(3) The eggshells are crushed manually, then the eggshells are ground by using a ball mill, and screening is carried out by using a screen to obtain kitchen waste byproduct precursor powder.
The other steps and amounts of raw materials were the same as in example 1.
Comparative example 2
The only difference from example 1 is that no physical activation treatment was performed during the preparation of the agricultural byproduct precursor powder in step 1. The method comprises the following steps:
step 1, preparing agricultural byproduct precursor powder, which comprises the following steps:
(1) Using rice hull ash produced by combusting rice hulls which are a side crop in agricultural production as a raw material, and sieving to obtain ash;
(2) Washing and cleaning the prepared rice hull ash, and performing filter pressing treatment to remove impurities;
(3) Then drying at 70 ℃ and grinding and sieving to remove impurities;
(4) Soaking rice hull ash obtained in the step (3) in sequence by using a chitosan quaternary ammonium salt solution with the concentration of 5wt% and a sodium phosphate solution with the concentration of 1wt%, wherein the mass ratio of the rice hull ash to the chitosan quaternary ammonium salt solution is 1:3, and the mass ratio of the rice hull ash to the sodium phosphate solution is 1:3, and exciting ash reaction activity by a chemical activation method;
(5) And carrying out filter pressing, drying, grinding and sieving treatment on the ash after chemical activation to obtain agricultural byproduct precursor powder.
The other steps and amounts of raw materials were the same as in example 1.
Comparative example 3
The only difference from example 1 is that the physical activation temperature during the preparation of the agricultural byproduct precursor powder in step 1 was 400 ℃. The method comprises the following steps:
step 1, preparing agricultural byproduct precursor powder, which comprises the following steps:
(1) Using rice hull ash produced by combusting rice hulls which are a side crop in agricultural production as a raw material, and sieving to obtain ash;
(2) Washing and cleaning the prepared rice hull ash, and performing filter pressing treatment to remove impurities;
(3) Then drying at 70 ℃ and grinding and sieving to remove impurities;
(4) Soaking rice hull ash obtained in the step (3) in sequence by using a chitosan quaternary ammonium salt solution with the concentration of 5wt% and a sodium phosphate solution with the concentration of 1wt%, wherein the mass ratio of the rice hull ash to the chitosan quaternary ammonium salt solution is 1:3, and the mass ratio of the rice hull ash to the sodium phosphate solution is 1:3, and exciting ash reaction activity by a chemical activation method; ;
(5) Carrying out filter pressing, drying, grinding and sieving treatment on ash after chemical activation;
(6) Then calcining for 2 hours at 400 ℃ and using a physical mode to excite ash activity;
(7) And finally grinding and sieving to obtain agricultural byproduct precursor powder.
The other steps and amounts of raw materials were the same as in example 1.
Comparative example 4
The only difference from example 1 is that the physical activation temperature during the preparation of the agricultural byproduct precursor powder in step 1 is 1000 ℃. The method comprises the following steps:
step 1, preparing agricultural byproduct precursor powder, which comprises the following steps:
(1) Using rice hull ash produced by combusting rice hulls which are a side crop in agricultural production as a raw material, and sieving to obtain ash;
(2) Washing and cleaning the prepared rice hull ash, and performing filter pressing treatment to remove impurities;
(3) Then drying at 70 ℃ and grinding and sieving to remove impurities;
(4) Soaking rice hull ash obtained in the step (3) in sequence by using a chitosan quaternary ammonium salt solution with the concentration of 5wt% and a sodium phosphate solution with the concentration of 1wt%, wherein the mass ratio of the rice hull ash to the chitosan quaternary ammonium salt solution is 1:3, and the mass ratio of the rice hull ash to the sodium phosphate solution is 1:3, and exciting ash reaction activity by a chemical activation method;
(5) Carrying out filter pressing, drying, grinding and sieving treatment on ash after chemical activation;
(6) Then calcining for 2 hours at 1000 ℃ and using a physical mode to excite ash activity;
(7) And finally grinding and sieving to obtain agricultural byproduct precursor powder.
The other steps and amounts of raw materials were the same as in example 1.
Comparative example 5
The only difference from example 1 is that no chemical activation treatment was performed during the preparation of the agricultural byproduct precursor powder in step 1. The method comprises the following steps:
step 1, preparing agricultural byproduct precursor powder, which comprises the following steps:
(1) Using rice hull ash produced by combusting rice hulls which are a side crop in agricultural production as a raw material, and sieving to obtain ash;
(2) Washing and cleaning the prepared rice hull ash, and performing filter pressing treatment to remove impurities;
(3) Then drying at 70 ℃ and grinding and sieving to remove impurities;
(4) Then calcining for 2 hours at 700 ℃ and using a physical mode to excite ash activity;
(5) And finally grinding and sieving to obtain agricultural byproduct precursor powder.
The other steps and amounts of raw materials were the same as in example 1.
Comparative example 6
The only difference from example 1 is that the chemical activation treatment does not use sodium phosphate solution during the preparation of the agricultural byproduct precursor powder in step 1. The method comprises the following steps:
step 1, preparing agricultural byproduct precursor powder, which comprises the following steps:
(1) Using rice hull ash produced by combusting rice hulls which are a side crop in agricultural production as a raw material, and sieving to obtain ash;
(2) Washing and cleaning the prepared rice hull ash, and performing filter pressing treatment to remove impurities;
(3) Then drying at 70 ℃ and grinding and sieving to remove impurities;
(4) The rice hull ash obtained by the treatment in the step (3) is soaked in chitosan quaternary ammonium salt solution with the concentration of 5wt%, the mass ratio of the rice hull ash to the chitosan quaternary ammonium salt solution is 1:3, and ash reaction activity is stimulated by a chemical activation method;
(5) Carrying out filter pressing, drying, grinding and sieving treatment on ash after chemical activation;
(6) Then calcining for 2 hours at 700 ℃ and using a physical mode to excite ash activity;
(7) And finally grinding and sieving to obtain agricultural byproduct precursor powder.
The other steps and amounts of raw materials were the same as in example 1.
Comparative example 7
The difference from example 1 is that the chemical activation treatment does not use chitosan quaternary ammonium salt solution in the preparation process of the agricultural byproduct precursor powder in step 1. The method comprises the following steps:
step 1, preparing agricultural byproduct precursor powder, which comprises the following steps:
(1) Using rice hull ash produced by combusting rice hulls which are a side crop in agricultural production as a raw material, and sieving to obtain ash;
(2) Washing and cleaning the prepared rice hull ash, and performing filter pressing treatment to remove impurities;
(3) Then drying at 70 ℃ and grinding and sieving to remove impurities;
(4) Soaking rice hull ash obtained in the step (3) in a sodium phosphate solution with the concentration of 1wt%, wherein the mass ratio of the rice hull ash to the sodium phosphate solution is 1:3, and exciting ash reaction activity by a chemical activation method;
(5) Carrying out filter pressing, drying, grinding and sieving treatment on ash after chemical activation;
(6) Then calcining for 2 hours at 700 ℃ and using a physical mode to excite ash activity;
(7) And finally grinding and sieving to obtain agricultural byproduct precursor powder.
The other steps and amounts of raw materials were the same as in example 1.
Comparative example 8
The difference from example 1 is that the precursor powder for kitchen waste by-product preparation in step 2 is not subjected to physical activation treatment. The method comprises the following steps:
step 2, preparing kitchen waste byproduct precursor powder, which comprises the following steps:
(1) Collecting kitchen waste byproduct eggshells as a preparation raw material;
(2) Thoroughly cleaning the collected eggshells to remove pollutants, and drying the eggshells at 70 ℃;
(3) Crushing eggshells manually, grinding the eggshells by using a ball mill, and sieving by using a screen;
(4) Sequentially treating the obtained eggshell ash with 0.1mol/L ethylenediamine tetraacetic acid solution and 95wt% ethanol solution, wherein the mass ratio of the eggshell ash to the ethylenediamine tetraacetic acid solution is 1:4, the mass ratio of the eggshell ash to the ethanol solution is 1:4, and exciting ash reaction activity by adopting a chemical activation method;
(5) And performing filter pressing, drying, grinding and sieving treatment on the eggshell ash after chemical activation to improve the purity of the eggshell ash and obtain kitchen waste byproduct precursor powder.
The other steps and amounts of raw materials were the same as in example 1.
Comparative example 9
The difference from example 1 is that the temperature of physical activation in the preparation of the precursor powder of the kitchen waste by-product in step 2 is 400 ℃. The method comprises the following steps:
step 2, preparing kitchen waste byproduct precursor powder, which comprises the following steps:
(1) Collecting kitchen waste byproduct eggshells as a preparation raw material;
(2) Thoroughly cleaning the collected eggshells to remove pollutants, and drying the eggshells at 70 ℃;
(3) Crushing eggshells manually, grinding the eggshells by using a ball mill, and sieving by using a screen;
(4) Sequentially treating the obtained eggshell ash with 0.1mol/L ethylenediamine tetraacetic acid solution and 95wt% ethanol solution, wherein the mass ratio of the eggshell ash to the ethylenediamine tetraacetic acid solution is 1:4, the mass ratio of the eggshell ash to the ethanol solution is 1:4, and exciting ash reaction activity by adopting a chemical activation method;
(5) Performing filter pressing, drying, grinding and sieving treatment on the eggshell ash after chemical activation to improve the purity of the eggshell ash;
(6) Followed by calcination at 400 ℃ for 2 hours, using physical means to excite ash activity;
(7) And finally grinding and sieving to obtain kitchen waste byproduct precursor powder.
The other steps and amounts of raw materials were the same as in example 1.
Comparative example 10
The difference from example 1 is that the temperature of physical activation in the preparation of the precursor powder of the kitchen waste by-product in step 2 is 1000 ℃. The method comprises the following steps:
step 2, preparing kitchen waste byproduct precursor powder, which comprises the following steps:
(1) Collecting kitchen waste byproduct eggshells as a preparation raw material;
(2) Thoroughly cleaning the collected eggshells to remove pollutants, and drying the eggshells at 70 ℃;
(3) Crushing eggshells manually, grinding the eggshells by using a ball mill, and sieving by using a screen;
(4) Sequentially treating the obtained eggshell ash with 0.1mol/L ethylenediamine tetraacetic acid solution and 95wt% ethanol solution, wherein the mass ratio of the eggshell ash to the ethylenediamine tetraacetic acid solution is 1:4, the mass ratio of the eggshell ash to the ethanol solution is 1:4, and exciting ash reaction activity by adopting a chemical activation method;
(5) Performing filter pressing, drying, grinding and sieving treatment on the eggshell ash after chemical activation to improve the purity of the eggshell ash;
(6) Followed by calcination at 1000 ℃ for 2 hours, using physical means to excite ash activity;
(7) And finally grinding and sieving to obtain kitchen waste byproduct precursor powder.
The other steps and amounts of raw materials were the same as in example 1.
Comparative example 11
The difference from example 1 is that the chemical activation treatment is not performed in the process of preparing the precursor powder of the kitchen waste by-product in step 2. The method comprises the following steps:
step 2, preparing kitchen waste byproduct precursor powder, which comprises the following steps:
(1) Collecting kitchen waste byproduct eggshells as a preparation raw material;
(2) Thoroughly cleaning the collected eggshells to remove pollutants, and drying the eggshells at 70 ℃;
(3) Crushing eggshells manually, grinding the eggshells by using a ball mill, and sieving by using a screen;
(4) Followed by calcination at 700 ℃ for 2 hours, using physical means to excite ash activity;
(5) And finally grinding and sieving to obtain kitchen waste byproduct precursor powder.
The other steps and amounts of raw materials were the same as in example 1.
Comparative example 12
The difference from example 1 is that no ethanol solution is used for chemical activation treatment in the preparation of the precursor powder of the kitchen waste by-product in step 2. The method comprises the following steps:
step 2, preparing kitchen waste byproduct precursor powder, which comprises the following steps:
(1) Collecting kitchen waste byproduct eggshells as a preparation raw material;
(2) Thoroughly cleaning the collected eggshells to remove pollutants, and drying the eggshells at 70 ℃;
(3) Crushing eggshells manually, grinding the eggshells by using a ball mill, and sieving by using a screen;
(4) Soaking the obtained eggshell ash in an ethylenediamine tetraacetic acid solution with the concentration of 0.1mol/L, wherein the mass ratio of the eggshell ash to the ethylenediamine tetraacetic acid solution is 1:4, and exciting ash reaction activity by adopting a chemical activation method;
(5) Performing filter pressing, drying, grinding and sieving treatment on the eggshell ash after chemical activation to improve the purity of the eggshell ash;
(6) Followed by calcination at 700 ℃ for 2 hours, using physical means to excite ash activity;
(7) And finally grinding and sieving to obtain kitchen waste byproduct precursor powder.
The other steps and amounts of raw materials were the same as in example 1.
Comparative example 13
The difference from example 1 is that ethylenediamine tetraacetic acid solution is not used in the chemical activation treatment in the preparation process of the precursor powder of the kitchen waste by-product in step 2. The method comprises the following steps:
step 2, preparing kitchen waste byproduct precursor powder, which comprises the following steps:
(1) Collecting kitchen waste byproduct eggshells as a preparation raw material;
(2) Thoroughly cleaning the collected eggshells to remove pollutants, and drying the eggshells at 70 ℃;
(3) Crushing eggshells manually, grinding the eggshells by using a ball mill, and sieving by using a screen;
(4) Soaking the obtained eggshell ash in an ethanol solution with the concentration of 95wt%, wherein the mass ratio of the eggshell ash to the ethanol solution is 1:4, and exciting ash reaction activity by adopting a chemical activation method;
(5) Performing filter pressing, drying, grinding and sieving treatment on the eggshell ash after chemical activation to improve the purity of the eggshell ash;
(6) Followed by calcination at 700 ℃ for 2 hours, using physical means to excite ash activity;
(7) And finally grinding and sieving to obtain kitchen waste byproduct precursor powder.
The other steps and amounts of raw materials were the same as in example 1.
Effect verification
Referring to "cement mortar strength test method" (GB/T17671-2021), concrete mixtures prepared in examples 1 to 3 and comparative examples 1 to 13 were put into a test mold, cured, demolded, then moved to a standard curing chamber (temperature 20.+ -. 3 ℃ C., relative humidity 95%) for curing, and subjected to mechanical property test at the target age (3 days, 7 days, 28 days), and the test results are shown in Table 1.
Table 1 results of mechanical Properties test of concrete test blocks of each group
Comparing the performance test result data of example 1 and comparative examples 1 to 13 in table 1, it can be seen that the test data of example 1 is significantly better than the data of comparative examples 1 to 13. The technical scheme adopted by the invention can effectively improve the mechanical strength of the solid waste base concrete.
The invention can perform physical activation on the agricultural byproducts and kitchen waste byproducts at a proper temperature, so that the components of the agricultural byproducts and kitchen waste byproducts can be better improved, and the contents of amorphous SiO 2 and CaO are increased, thereby realizing high-efficiency utilization.
According to the invention, the chitosan quaternary ammonium salt solution is adopted to activate rice hull ash, so that the surface morphology of the rice hull ash can be improved, the sodium phosphate solution is continuously soaked, the densification of the surface morphology of the rice hull ash can be further promoted, the reaction level between the rice hull ash and an alkaline activator is improved, the polymerization reaction of agricultural byproducts in an alkaline environment is promoted, and the mechanical strength of a concrete material is further improved from a microscopic level.
Meanwhile, the invention adopts the ethylenediamine tetraacetic acid solution to activate the eggshell ash, so that the surface morphology of the eggshell ash can be improved, the surface activity of the eggshell ash can be further improved by continuously soaking the eggshell ash in the ethanol solution, the reaction level between the eggshell ash and an alkaline activator can be effectively improved, the polymerization reaction of kitchen waste byproducts in an alkaline environment is promoted, and the mechanical strength of the concrete material is further improved from a microscopic level.
In the foregoing, the protection scope of the present invention is not limited to the preferred embodiments, and any person skilled in the art, within the scope of the present invention, should be covered by the protection scope of the present invention by equally replacing or changing the technical scheme and the inventive concept thereof.
Claims (10)
1. The ecological high-strength concrete is characterized by comprising the following raw materials of precursor powder, an activating agent, sand aggregate and water in a mass ratio of 1 (0.2-0.4) (0.1-0.2);
the precursor powder comprises industrial byproduct precursor powder, agricultural byproduct precursor powder and kitchen waste byproduct precursor powder with the mass ratio of 1 (0.5-1.5) to 2.5-3.5.
2. The ecological high-strength concrete according to claim 1, wherein the activator is obtained by mixing sodium silicate solution and sodium hydroxide solution according to the volume ratio of (1.3-1.7): 1; sodium silicate is Na 2O·nSiO2, n is 3-3.3, and the mass ratio of H 2 O to Na 2O·nSiO2 in the sodium silicate solution is 7-10; the concentration of the sodium hydroxide solution is 12-16 mol/L.
3. The ecological high-strength concrete according to claim 1, wherein the maximum particle size of the sand aggregate is 1mm and the average particle size is 0.6-0.7 mm.
4. The ecological high-strength concrete according to claim 1, wherein the industrial byproduct precursor powder is fly ash; the agricultural byproduct precursor powder is prepared by processing rice hull raw materials; the kitchen waste byproduct precursor powder is prepared by processing eggshell raw materials.
5. The ecological high-strength concrete according to claim 4, wherein the preparation method of the agricultural byproduct precursor powder comprises the following steps: firstly, sequentially adopting chitosan quaternary ammonium salt solution and sodium phosphate solution to perform chemical activation treatment on rice hull ash obtained by burning rice hulls, and then performing filter pressing, drying, grinding, sieving and carbonization treatment to obtain the agricultural byproduct precursor powder.
6. The ecological high-strength concrete according to claim 5, wherein the concentration of the chitosan quaternary ammonium salt solution is 4.5-5.5 wt%; the concentration of the sodium phosphate solution is 0.8-1.2 wt%; the mass ratio of the rice hull ash to the chitosan quaternary ammonium salt solution is 1 (2.5-3.5), and the mass ratio of the rice hull ash to the sodium phosphate solution is 1 (2.5-3.5); the carbonization treatment is carried out at 600-800 ℃ for 2-4 hours.
7. The ecological high-strength concrete according to claim 4, wherein the preparation method of the kitchen waste byproduct precursor powder comprises the following steps: firstly, crushing, grinding and screening eggshells to obtain eggshell ash; and then sequentially adopting an ethylenediamine tetraacetic acid solution and an ethanol solution to perform chemical activation treatment on the obtained eggshell ash, and performing filter pressing, drying, grinding, sieving and carbonization treatment to obtain the kitchen waste byproduct precursor powder.
8. The ecological high-strength concrete according to claim 7, wherein the concentration of the ethylene diamine tetraacetic acid solution is 0.08-0.12 mol/L, the concentration of the ethanol solution is 90-95 wt%, the mass ratio of the eggshell ash to the ethylene diamine tetraacetic acid solution is 1 (2-5), and the mass ratio of the eggshell ash to the ethanol solution is 1 (2-5); the carbonization treatment is carried out at 600-800 ℃ for 2-4 hours.
9. A method for preparing the ecological high-strength concrete according to any one of claims 1 to 8, comprising the following steps: weighing raw materials according to the proportion of the raw material consumption, and firstly, dry-mixing the industrial byproduct precursor powder, the agricultural byproduct precursor powder and the kitchen waste byproduct precursor powder to obtain uniformly-dispersed precursor powder; then adding sand aggregate for dry mixing to obtain a dry mixed material; finally, adding the activator and water into the dry-mixed material for continuous mixing.
10. The preparation method according to claim 9, wherein after adding the activator and water into the dry mix and continuing mixing, the obtained mix is continuously put into a test mould, cured, demolded, and then moved to a standard curing room for curing, thereby obtaining the ecological high-strength concrete.
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